import {
  getSamplePageBySlug,
  getSamplePages,
  getSamplePostBySlug,
  getSamplePosts,
  getSampleTags
} from '../utils/sample-content'
import { getDefaultNavigationItems } from '../utils/navigation-items'
import { buildPublicPrimaryTree, orderNavigationItemsForInsert } from '../utils/navigation-tree'
import { getDefaultSiteSettings } from '../utils/site-settings'
import { toAdminPostFormTitle } from '../../lib/admin-post-title.js'
import {
  DEFAULT_ANNOUNCEMENT_ALIGNMENT,
  DEFAULT_ANNOUNCEMENT_BACKGROUND_COLOR,
  normalizeAnnouncementAlignment,
  normalizeAnnouncementBackgroundColor
} from '../../lib/announcement-bar.js'
import { DEFAULT_BRAND_COLOR, normalizeBrandColor } from '../../lib/brand-color.js'
import {
  normalizeSignupBlockedUsernames,
  parseSignupBlockedUsernamesFromDb
} from '../../lib/signup-blocked-usernames.js'
import { normalizePostTagLimit } from '../../lib/post-tag-limit.js'
import {
  DEFAULT_FEATURED_POST_LIMIT,
  DEFAULT_HOME_LATEST_POST_LIMIT,
  DEFAULT_PAGE_SECTION_ITEM_LIMIT,
  DEFAULT_POST_LIST_PAGE_SIZE,
  DEFAULT_TAG_POST_LIST_PAGE_SIZE,
  normalizeDisplayCount
} from '../../lib/display-count-settings.js'
import {
  normalizeUploadMaxFileCount,
  normalizeUploadMaxTotalSize
} from '../../lib/upload-size-limit.js'
import { normalizeSocialLinks } from '../../lib/social-links.js'
import {
  createPageCoverThumbnailForImageUrl,
  createPostBodyThumbnailsForContent,
  createPostThumbnailForImageUrl,
  getExistingPageCoverThumbnailUrl,
  getExistingPostThumbnailUrl
} from '../utils/post-thumbnail-image.js'
import { getPostgresClient } from './postgres-client'
import { replaceMediaReferences } from './media-catalog-repository'
import { createPostSummary } from '../../composables/createPostSummary.js'

/**
 * 콘텐츠 저장 성공을 방해하지 않고 미디어 참조를 갱신한다.
 * @param {string} type - 참조 종류
 * @param {string} id - 콘텐츠 id
 * @param {Object} input - 저장 입력
 * @returns {Promise<void>}
 */
const syncContentMediaReferences = async (type, id, input) => {
  try {
    await replaceMediaReferences(type, id, {
      content: input.content,
      featuredImage: input.featuredImage,
      ogImage: input.ogImage
    }, {
      title: input.title,
      slug: input.slug,
      status: input.status
    })
  } catch {
    console.warn('[media-catalog] 콘텐츠 참조 갱신 실패')
  }
}

/**
 * 사이트 설정 미디어 참조를 최선 노력 방식으로 갱신한다.
 * @param {Object} settings - 현재 사이트 설정
 * @returns {Promise<void>}
 */
const syncSiteSettingsMediaReferences = async (settings) => {
  try {
    await replaceMediaReferences('site_setting', 'site', {
      logoUrl: settings.logoUrl,
      faviconUrl: settings.faviconUrl,
      homeCoverImageUrl: settings.homeCoverImageUrl,
      homeCoverDarkImageUrl: settings.homeCoverDarkImageUrl
    }, {
      title: '사이트 설정',
      status: 'system'
    })
  } catch {
    console.warn('[media-catalog] 사이트 설정 참조 갱신 실패')
  }
}

/**
 * 태그 미디어 참조를 최선 노력 방식으로 갱신한다.
 * @param {Object} tag - 현재 태그
 * @returns {Promise<void>}
 */
const syncTagMediaReferences = async (tag) => {
  try {
    await replaceMediaReferences('tag', tag.id, {
      headerImageUrl: tag.headerImageUrl
    }, {
      title: tag.name,
      slug: tag.slug,
      status: tag.tagType
    })
  } catch {
    console.warn('[media-catalog] 태그 참조 갱신 실패')
  }
}

/**
 * 게시물 행을 API 응답 구조로 변환
 * @param {Object} row - 게시물 행
 * @returns {Object} 게시물 응답
 */
const mapPostRow = (row) => ({
  id: row.id,
  title: row.title,
  slug: row.slug,
  authorId: row.author_id || null,
  content: row.content,
  excerpt: row.excerpt,
  featuredImage: row.featured_image,
  featuredImageThumbnail: getExistingPostThumbnailUrl(row.featured_image),
  showFeaturedImage: Boolean(row.show_featured_image),
  isFeatured: Boolean(row.is_featured),
  adminPinned: Boolean(row.admin_pinned),
  commentCount: Number(row.comment_count || 0),
  totalViews: Number(row.total_views || 0),
  seoTitle: row.seo_title || '',
  seoDescription: row.seo_description || '',
  canonicalUrl: row.canonical_url || '',
  noindex: Boolean(row.noindex),
  ogImage: row.og_image || null,
  status: row.status,
  publishedAt: row.published_at ? row.published_at.toISOString() : null,
  createdAt: row.created_at.toISOString(),
  updatedAt: row.updated_at.toISOString(),
  tags: row.tags || []
})

/**
 * 공개 목록 게시물에서 본문을 제외하고 표시용 요약을 만든다.
 * @param {Object} post - 게시물 응답
 * @returns {Object} 공개 목록 게시물 요약
 */
const mapPublicPostSummary = (post) => {
  const { content, ...summary } = post

  return {
    ...summary,
    excerpt: createPostSummary(post.excerpt, content, {
      maxLength: 320,
      appendEllipsis: false
    })
  }
}

/**
 * 관리자 API용 게시물 행 변환(제목 없음 플레이스홀더는 빈 문자열)
 * @param {Object} row - 게시물 행
 * @returns {Object} 게시물 응답
 */
const mapAdminPostRow = (row) => ({
  ...mapPostRow(row),
  title: toAdminPostFormTitle(row.title)
})

/**
 * 관리자 목록 API용 게시물 요약 행 변환
 * @param {Object} row - 게시물 행
 * @returns {Object} 게시물 요약 응답
 */
const mapAdminPostSummaryRow = (row) => ({
  id: row.id,
  title: toAdminPostFormTitle(row.title),
  slug: row.slug,
  authorId: row.author_id || null,
  excerpt: row.excerpt,
  featuredImage: row.featured_image,
  featuredImageThumbnail: getExistingPostThumbnailUrl(row.featured_image),
  showFeaturedImage: Boolean(row.show_featured_image),
  isFeatured: Boolean(row.is_featured),
  adminPinned: Boolean(row.admin_pinned),
  commentCount: Number(row.comment_count || 0),
  totalViews: Number(row.total_views || 0),
  status: row.status,
  publishedAt: row.published_at ? row.published_at.toISOString() : null,
  createdAt: row.created_at.toISOString(),
  updatedAt: row.updated_at.toISOString(),
  backlinkCount: Number(row.backlinkCount || row.backlink_count || 0),
  tags: row.tags || []
})

/**
 * 정규식 특수 문자를 이스케이프한다.
 * @param {string} value - 원본 문자열
 * @returns {string} 이스케이프된 문자열
 */
const escapeRegExp = (value) => String(value || '').replace(/[.*+?^${}()|[\]\\]/g, '\\$&')

/**
 * 게시물 공개 링크 참조 정규식을 생성한다.
 * @param {string} slug - 게시물 슬러그
 * @returns {RegExp} 게시물 링크 정규식
 */
const createPostLinkReferencePattern = (slug) => {
  return new RegExp(`(?:^|[\\s("'\\[])(?:https?:\\/\\/[^/\\s)"'<>]+)?\\/post\\/${escapeRegExp(slug)}(?=$|[\\s)"'<>?#/])`, 'gi')
}

/**
 * 본문에서 특정 게시물 링크 참조 개수를 계산한다.
 * @param {string} content - 게시물 본문
 * @param {string} slug - 참조 대상 슬러그
 * @returns {number} 참조 개수
 */
const countPostLinkReferences = (content, slug) => {
  if (!slug) {
    return 0
  }

  return [...String(content || '').matchAll(createPostLinkReferencePattern(slug))].length
}

/**
 * 대상 게시물별 백링크 콘텐츠 개수 맵을 생성한다.
 * @param {Array<{ id: string, slug: string }>} targetPosts - 백링크 개수를 계산할 게시물 목록
 * @param {Array<{ id: string, sourceType?: 'post'|'page', content?: string }>} sourceItems - 링크 출처 콘텐츠 목록
 * @returns {Map<string, number>} 게시물 ID별 백링크 콘텐츠 개수
 */
const createAdminPostBacklinkCountMap = (targetPosts, sourceItems) => {
  const countMap = new Map(targetPosts.map((post) => [post.id, 0]))

  for (const targetPost of targetPosts) {
    if (!targetPost?.id || !targetPost?.slug) {
      continue
    }

    const backlinkCount = sourceItems.filter((sourceItem) => {
      return !(sourceItem.sourceType === 'post' && sourceItem.id === targetPost.id)
        && countPostLinkReferences(sourceItem.content, targetPost.slug) > 0
    }).length

    countMap.set(targetPost.id, backlinkCount)
  }

  return countMap
}

/**
 * 관리자 글 목록 대상의 백링크 콘텐츠 개수를 조회한다.
 * @param {Array<{ id: string, slug: string }>} targetPosts - 백링크 개수를 계산할 게시물 목록
 * @returns {Promise<Map<string, number>>} 게시물 ID별 백링크 콘텐츠 개수
 */
const getAdminPostBacklinkCountMap = async (targetPosts) => {
  const sql = getPostgresClient()

  if (!targetPosts.length) {
    return new Map()
  }

  if (!sql) {
    return createAdminPostBacklinkCountMap(targetPosts, [
      ...getSamplePosts().map((post) => ({ ...post, sourceType: 'post' })),
      ...getSamplePages().map((page) => ({ ...page, sourceType: 'page' }))
    ])
  }

  const sourceRows = await sql`
    SELECT id, 'post' AS source_type, content
    FROM posts
    WHERE content IS NOT NULL
      AND content <> ''
    UNION ALL
    SELECT id, 'page' AS source_type, content
    FROM pages
    WHERE content IS NOT NULL
      AND content <> ''
  `

  return createAdminPostBacklinkCountMap(targetPosts, sourceRows.map((row) => ({
    id: row.id,
    sourceType: row.source_type,
    content: row.content
  })))
}

/**
 * 관리자 글 목록 페이지 표시 개수를 정규화한다.
 * @param {unknown} value - 요청 표시 개수
 * @returns {number} 표시 개수
 */
const normalizeAdminPostPageSize = (value) => {
  const pageSize = Number(value) || 50

  if ([20, 50, 100].includes(pageSize)) {
    return pageSize
  }

  return 50
}

/**
 * 관리자 글 목록 페이지 번호를 정규화한다.
 * @param {unknown} value - 요청 페이지
 * @returns {number} 페이지 번호
 */
const normalizeAdminPostPage = (value) => Math.max(1, Number(value) || 1)

/**
 * 관리자 글 목록 상태 필터를 정규화한다.
 * @param {unknown} value - 요청 상태 필터
 * @returns {'all'|'published'|'draft'|'scheduled'|'members'|'private'} 상태 필터
 */
const normalizeAdminPostStatusFilter = (value) => {
  const status = String(value || 'all')

  return ['all', 'published', 'draft', 'scheduled', 'members', 'private'].includes(status)
    ? status
    : 'all'
}

/**
 * 관리자 글 목록 추천 필터를 정규화한다.
 * @param {unknown} value - 요청 추천 필터
 * @returns {'all'|'featured'} 추천 필터
 */
const normalizeAdminPostFeaturedFilter = (value) => String(value || 'all') === 'featured' ? 'featured' : 'all'

/**
 * 관리자 글 목록 정렬을 정규화한다.
 * @param {unknown} value - 요청 정렬
 * @returns {'newest'|'oldest'} 정렬
 */
const normalizeAdminPostSortOrder = (value) => String(value || 'newest') === 'oldest' ? 'oldest' : 'newest'

/**
 * 관리자 글 목록 검색 문자열을 정규화한다.
 * @param {unknown} value - 요청 검색어
 * @returns {string} 검색어
 */
const normalizeAdminPostSearchQuery = (value) => String(value || '').trim()

/**
 * 고정 페이지 행을 API 응답 구조로 변환
 * @param {Object} row - 고정 페이지 행
 * @returns {Object} 고정 페이지 응답
 */
const mapPageRow = (row) => ({
  id: row.id,
  title: row.title,
  slug: row.slug,
  content: row.content,
  renderMode: row.render_mode || 'markdown',
  status: row.status || 'published',
  featuredImage: row.featured_image,
  listingImageThumbnail: getExistingPageCoverThumbnailUrl(row.featured_image),
  isListed: Boolean(row.is_listed),
  isFeatured: Boolean(row.is_featured),
  listingSection: row.listing_section || '',
  listingTitle: row.listing_title || '',
  listingDescription: row.listing_description || '',
  listingSortOrder: Number(row.listing_sort_order || 0),
  totalViews: Number(row.total_views || 0),
  createdAt: row.created_at.toISOString(),
  updatedAt: row.updated_at.toISOString()
})

/**
 * 페이지 섹션 행을 API 응답 구조로 변환
 * @param {Object} row - 페이지 섹션 행
 * @returns {Object} 페이지 섹션 응답
 */
const mapPageSectionRow = (row) => ({
  id: row.id,
  name: row.name,
  sortOrder: Number(row.sort_order || 0),
  pageCount: Number(row.page_count || 0),
  createdAt: row.created_at.toISOString(),
  updatedAt: row.updated_at.toISOString()
})

/**
 * 태그 행을 API 응답 구조로 변환
 * @param {Object} row - 태그 행
 * @returns {Object} 태그 응답
 */
const mapTagRow = (row) => ({
  id: row.id,
  name: row.name,
  slug: row.slug,
  description: row.description,
  headerImageUrl: row.header_image_url || '',
  headerTitle: row.header_title || '',
  headerText: row.header_text || '',
  sortOrder: row.sort_order,
  color: row.color,
  tagType: row.tag_type || 'managed',
  postCount: Number(row.post_count || 0),
  lastUsedAt: row.last_used_at ? row.last_used_at.toISOString() : null,
  updatedAt: row.updated_at ? row.updated_at.toISOString() : null
})

/**
 * 사이트 설정 행을 API 응답 구조로 변환
 * @param {Object} row - 사이트 설정 행
 * @returns {Object} 사이트 설정 응답
 */
const mapSiteSettingsRow = (row) => ({
  title: row.title,
  description: row.description,
  siteUrl: row.site_url,
  logoText: row.logo_text,
  logoUrl: row.logo_url || '',
  faviconUrl: row.favicon_url || '',
  copyrightText: row.copyright_text,
  socialLinks: normalizeSocialLinks(row.social_links),
  showPostUpdatedAt: Boolean(row.show_post_updated_at),
  postTagLimit: normalizePostTagLimit(row.post_tag_limit),
  homeLatestPostLimit: normalizeDisplayCount(row.home_latest_post_limit, DEFAULT_HOME_LATEST_POST_LIMIT),
  postListPageSize: normalizeDisplayCount(row.post_list_page_size, DEFAULT_POST_LIST_PAGE_SIZE),
  tagPostListPageSize: normalizeDisplayCount(row.tag_post_list_page_size, DEFAULT_TAG_POST_LIST_PAGE_SIZE),
  featuredPostLimit: normalizeDisplayCount(row.featured_post_limit, DEFAULT_FEATURED_POST_LIMIT),
  pageSectionItemLimit: normalizeDisplayCount(row.page_section_item_limit, DEFAULT_PAGE_SECTION_ITEM_LIMIT),
  uploadMaxFileCount: normalizeUploadMaxFileCount(row.upload_max_file_count),
  uploadMaxTotalSize: normalizeUploadMaxTotalSize(row.upload_max_total_size),
  homeCoverImageUrl: row.home_cover_image_url || '',
  homeCoverDarkImageUrl: row.home_cover_dark_image_url || '',
  homeCoverTitle: row.home_cover_title || '',
  homeCoverText: row.home_cover_text || '',
  brandColor: normalizeBrandColor(row.brand_color || DEFAULT_BRAND_COLOR),
  announcementEnabled: Boolean(row.announcement_enabled),
  announcementText: row.announcement_text || '',
  announcementUrl: row.announcement_url || '',
  announcementBackgroundColor: normalizeAnnouncementBackgroundColor(row.announcement_background_color || DEFAULT_ANNOUNCEMENT_BACKGROUND_COLOR),
  announcementAlignment: normalizeAnnouncementAlignment(row.announcement_alignment || DEFAULT_ANNOUNCEMENT_ALIGNMENT),
  signupBlockedUsernames: parseSignupBlockedUsernamesFromDb(row.signup_blocked_usernames),
  adsTxt: row.ads_txt || '',
  customHeadCode: row.custom_head_code || '',
  customFooterCode: row.custom_footer_code || '',
  adHomeFeedCode: row.ad_home_feed_code || '',
  adHomeInfeedCode: row.ad_home_infeed_code || '',
  adSidebarCode: row.ad_sidebar_code || '',
  adPostSidebarCode: row.ad_post_sidebar_code || '',
  adPostTopCode: row.ad_post_top_code || '',
  adPostInArticleCode: row.ad_post_in_article_code || '',
  adPostBottomCode: row.ad_post_bottom_code || '',
  updatedAt: row.updated_at.toISOString()
})

/**
 * 네비게이션 행을 API 응답 구조로 변환
 * @param {Object} row - 네비게이션 행
 * @returns {Object} 네비게이션 응답
 */
const mapNavigationItemRow = (row) => ({
  id: row.id,
  label: row.label,
  url: row.url,
  descriptionText: row.description_text || '',
  thumbnailUrl: row.thumbnail_url || '',
  cachedFaviconUrl: row.cached_favicon_url || '',
  faviconCachedAt: row.favicon_cached_at ? row.favicon_cached_at.toISOString() : '',
  location: row.location,
  sortOrder: row.sort_order,
  isVisible: row.is_visible,
  parentId: row.parent_id ?? null,
  isFolder: Boolean(row.is_folder),
  createdAt: row.created_at.toISOString(),
  updatedAt: row.updated_at.toISOString()
})

/**
 * 태그 슬러그 목록 정규화
 * @param {Array<string>} tags - 태그 슬러그 목록
 * @returns {Array<string>} 정규화된 태그 슬러그 목록
 */
const normalizeTagSlugs = (tags = []) => {
  const seen = new Set()
  const out = []

  for (const tag of tags) {
    const normalized = String(tag)
      .trim()
      .normalize('NFC')
      .toLowerCase()
      .replace(/[\\/]+/g, '-')
      .replace(/\s+/g, '-')
      .replace(/[^a-z0-9가-힣-]+/g, '')
      .replace(/-+/g, '-')
      .replace(/^-|-$/g, '')
    if (!normalized) {
      continue
    }
    const dedupeKey = normalized.toLowerCase()
    if (seen.has(dedupeKey)) {
      continue
    }
    seen.add(dedupeKey)
    out.push(normalized)
  }

  return out
}

/**
 * 태그 슬러그를 표시용 태그명으로 변환
 * @param {string} slug - 태그 슬러그
 * @returns {string} 태그명
 */
const getTagNameFromSlug = (slug) => {
  const trimmed = String(slug).trim()
  if (!trimmed) {
    return ''
  }
  if (/[가-힣]/.test(trimmed)) {
    return trimmed.split('-').filter(Boolean).join(' ')
  }

  return trimmed
    .split('-')
    .filter(Boolean)
    .map((word) => `${word.charAt(0).toUpperCase()}${word.slice(1)}`)
    .join(' ')
}

/**
 * 새 태그 표시 이름을 정리한다.
 * @param {string} value - 원본 표시 이름
 * @returns {string} 표시 이름
 */
const normalizeTagDisplayName = (value) => String(value || '')
  .normalize('NFC')
  .trim()
  .replace(/\s*\/\s*/g, '/')
  .replace(/\s+/g, ' ')

/**
 * 태그 슬러그에 대응하는 표시 이름을 반환한다.
 * @param {string} slug - 태그 슬러그
 * @param {Object} tagNames - 태그 표시 이름 맵
 * @returns {string} 태그명
 */
const resolveTagName = (slug, tagNames = {}) => {
  const inputName = normalizeTagDisplayName(tagNames[slug])
  return inputName || getTagNameFromSlug(slug)
}

/**
 * 게시물 태그 연결 저장
 * @param {Function} sql - PostgreSQL 트랜잭션 클라이언트
 * @param {string} postId - 게시물 ID
 * @param {Array<string>} tags - 태그 슬러그 목록
 * @param {Object} tagNames - 태그 표시 이름 맵
 * @returns {Promise<void>} 저장 결과
 */
const syncPostTags = async (sql, postId, tags, tagNames = {}) => {
  const tagSlugs = normalizeTagSlugs(tags)

  await sql`
    DELETE FROM post_tags
    WHERE post_id = ${postId}
  `

  for (const [index, slug] of tagSlugs.entries()) {
    const tagRows = await sql`
      INSERT INTO tags (name, slug, tag_type, sort_order)
      VALUES (${resolveTagName(slug, tagNames)}, ${slug}, 'general', 0)
      ON CONFLICT (slug) DO UPDATE
      SET updated_at = now()
      RETURNING id
    `

    await sql`
      INSERT INTO post_tags (post_id, tag_id, sort_order)
      VALUES (${postId}, ${tagRows[0].id}, ${index * 10})
      ON CONFLICT (post_id, tag_id) DO UPDATE
      SET sort_order = EXCLUDED.sort_order
    `
  }
}

/**
 * 공개 게시물 목록 조회
 * @param {{ includeMembership?: boolean, includeContent?: boolean, limit?: number|null, offset?: number, tagSlug?: string, featuredOnly?: boolean, includeTotal?: boolean }} [options] - 조회 옵션
 * @returns {Promise<Array|{ items: Array, total: number }>} 게시물 목록
 */
export const listPosts = async ({
  includeMembership = false,
  includeContent = false,
  limit = null,
  offset = 0,
  tagSlug = '',
  featuredOnly = false,
  includeTotal = false
} = {}) => {
  const sql = getPostgresClient()
  const resolvedLimit = Number.isInteger(limit) && limit > 0 ? limit : null
  const resolvedOffset = Number.isInteger(offset) && offset > 0 ? offset : 0
  const normalizedTagSlug = String(tagSlug || '').trim()

  if (!sql) {
    let samplePosts = getSamplePosts()
    if (featuredOnly) {
      samplePosts = samplePosts.filter((post) => Boolean(post.isFeatured))
    }
    if (normalizedTagSlug) {
      samplePosts = samplePosts.filter((post) => post.tags.includes(normalizedTagSlug))
    }
    const total = samplePosts.length
    const selectedItems = resolvedLimit
      ? samplePosts.slice(resolvedOffset, resolvedOffset + resolvedLimit)
      : samplePosts
    const items = includeContent
      ? selectedItems
      : selectedItems.map(mapPublicPostSummary)

    return includeTotal ? { items, total } : items
  }

  const rows = await sql`
    SELECT
      posts.id,
      posts.title,
      posts.slug,
      posts.author_id,
      CASE
        WHEN ${includeContent} = true THEN posts.content
        ELSE LEFT(posts.content, 4000)
      END AS content,
      posts.excerpt,
      posts.featured_image,
      posts.show_featured_image,
      posts.is_featured,
      posts.admin_pinned,
      posts.seo_title,
      posts.seo_description,
      posts.canonical_url,
      posts.noindex,
      posts.og_image,
      posts.status,
      posts.published_at,
      posts.created_at,
      posts.updated_at,
      (
        SELECT COUNT(*)::int
        FROM comments
        WHERE comments.post_id = posts.id
          AND comments.status = 'published'
      ) AS comment_count,
      (
        SELECT COALESCE(SUM(post_analytics_daily.views), 0)::int
        FROM post_analytics_daily
        WHERE post_analytics_daily.post_id = posts.id
      ) AS total_views,
      COALESCE(array_agg(tags.slug ORDER BY post_tags.sort_order ASC, post_tags.created_at ASC, tags.name ASC) FILTER (WHERE tags.slug IS NOT NULL), '{}') AS tags
    FROM posts
    LEFT JOIN post_tags ON post_tags.post_id = posts.id
    LEFT JOIN tags ON tags.id = post_tags.tag_id
    WHERE (
        posts.status = 'published'
        OR (${includeMembership} = true AND posts.status = 'members')
      )
      AND (
        posts.status = 'members'
        OR posts.published_at IS NULL
        OR posts.published_at <= now()
      )
      AND (${featuredOnly} = false OR posts.is_featured = true)
      AND (
        ${normalizedTagSlug || null}::text IS NULL
        OR EXISTS (
          SELECT 1
          FROM post_tags tagged_post_tags
          INNER JOIN tags tagged_tags ON tagged_tags.id = tagged_post_tags.tag_id
          WHERE tagged_post_tags.post_id = posts.id
            AND tagged_tags.slug = ${normalizedTagSlug || null}
        )
      )
    GROUP BY posts.id
    ORDER BY posts.published_at DESC NULLS LAST, posts.created_at DESC
    LIMIT ${resolvedLimit || 2147483647}
    OFFSET ${resolvedOffset}
  `

  const mappedRows = rows.map(mapPostRow)
  const items = includeContent
    ? mappedRows
    : mappedRows.map(mapPublicPostSummary)

  if (!includeTotal) {
    return items
  }

  const totalRows = await sql`
    SELECT COUNT(*)::int AS total
    FROM posts
    WHERE (
        posts.status = 'published'
        OR (${includeMembership} = true AND posts.status = 'members')
      )
      AND (
        posts.status = 'members'
        OR posts.published_at IS NULL
        OR posts.published_at <= now()
      )
      AND (${featuredOnly} = false OR posts.is_featured = true)
      AND (
        ${normalizedTagSlug || null}::text IS NULL
        OR EXISTS (
          SELECT 1
          FROM post_tags tagged_post_tags
          INNER JOIN tags tagged_tags ON tagged_tags.id = tagged_post_tags.tag_id
          WHERE tagged_post_tags.post_id = posts.id
            AND tagged_tags.slug = ${normalizedTagSlug || null}
        )
      )
  `

  return {
    items,
    total: Number(totalRows[0]?.total || 0)
  }
}

/**
 * 관리자 게시물 목록 요약 조회
 * @param {Object} [options] - 조회 옵션
 * @param {boolean} [options.paged] - 페이지 응답 사용 여부
 * @param {number} [options.page] - 페이지 번호
 * @param {number} [options.pageSize] - 페이지당 개수
 * @param {string} [options.searchQuery] - 검색어
 * @param {string} [options.status] - 상태 필터
 * @param {string} [options.tagSlug] - 태그 슬러그
 * @param {string} [options.featured] - 추천 필터
 * @param {string} [options.sortOrder] - 정렬
 * @returns {Promise<Array|Object>} 관리자 게시물 목록 요약
 */
export const listAdminPosts = async (options = {}) => {
  const sql = getPostgresClient()
  const paged = Boolean(options.paged)
  const page = normalizeAdminPostPage(options.page)
  const pageSize = normalizeAdminPostPageSize(options.pageSize)
  const offset = (page - 1) * pageSize
  const normalizedSearchQuery = normalizeAdminPostSearchQuery(options.searchQuery)
  const searchPattern = normalizedSearchQuery ? `%${normalizedSearchQuery}%` : null
  const normalizedStatus = normalizeAdminPostStatusFilter(options.status)
  const normalizedTagSlug = String(options.tagSlug || '').trim()
  const normalizedFeatured = normalizeAdminPostFeaturedFilter(options.featured)
  const normalizedSortOrder = normalizeAdminPostSortOrder(options.sortOrder)

  if (!sql) {
    let samplePosts = getSamplePosts().map((post) => {
      const { content, ...summary } = post
      return summary
    })

    samplePosts = samplePosts.filter((post) => {
      const sortAt = post.publishedAt || post.updatedAt || post.createdAt
      const isPublic = post.status === 'published' && (!post.publishedAt || new Date(post.publishedAt) <= new Date())
      const statusKey = post.status === 'members' || post.status === 'private'
        ? post.status
        : post.status === 'published' && !isPublic
          ? 'scheduled'
          : post.status === 'published'
            ? 'published'
            : 'draft'
      const matchesStatus = normalizedStatus === 'all' || statusKey === normalizedStatus
      const matchesTag = !normalizedTagSlug || (post.tags || []).includes(normalizedTagSlug)
      const matchesFeatured = normalizedFeatured !== 'featured' || post.isFeatured
      const searchText = [
        post.title,
        post.slug,
        post.excerpt,
        (post.tags || []).join(' ')
      ].join(' ').toLowerCase()
      const matchesSearch = !normalizedSearchQuery || searchText.includes(normalizedSearchQuery.toLowerCase())

      post.sortAt = sortAt
      return matchesStatus && matchesTag && matchesFeatured && matchesSearch
    })
    samplePosts.sort((left, right) => {
      if (Boolean(left.adminPinned) !== Boolean(right.adminPinned)) {
        return left.adminPinned ? -1 : 1
      }

      const leftTime = new Date(left.sortAt || 0).getTime()
      const rightTime = new Date(right.sortAt || 0).getTime()

      return normalizedSortOrder === 'oldest' ? leftTime - rightTime : rightTime - leftTime
    })

    if (!paged) {
      const items = samplePosts.map(({ sortAt, ...post }) => post)
      const backlinkCounts = createAdminPostBacklinkCountMap(items, getSamplePosts())
      return items.map((post) => ({
        ...post,
        backlinkCount: backlinkCounts.get(post.id) || 0
      }))
    }

    const total = samplePosts.length
    const items = samplePosts.slice(offset, offset + pageSize).map(({ sortAt, ...post }) => post)
    const backlinkCounts = createAdminPostBacklinkCountMap(items, getSamplePosts())

    return {
      items: items.map((post) => ({
        ...post,
        backlinkCount: backlinkCounts.get(post.id) || 0
      })),
      pagination: {
        page,
        pageSize,
        total,
        pageCount: Math.max(1, Math.ceil(total / pageSize))
      },
      counts: {
        total: getSamplePosts().length,
        featured: getSamplePosts().filter((post) => post.isFeatured).length,
        pinned: getSamplePosts().filter((post) => post.adminPinned).length
      }
    }
  }

  const rows = await sql`
    SELECT
      posts.id,
      posts.title,
      posts.slug,
      posts.author_id,
      posts.excerpt,
      posts.featured_image,
      posts.show_featured_image,
      posts.is_featured,
      posts.admin_pinned,
      posts.status,
      posts.published_at,
      posts.created_at,
      posts.updated_at,
      (
        SELECT COUNT(*)::int
        FROM comments
        WHERE comments.post_id = posts.id
          AND comments.status = 'published'
      ) AS comment_count,
      (
        SELECT COALESCE(SUM(post_analytics_daily.views), 0)::int
        FROM post_analytics_daily
        WHERE post_analytics_daily.post_id = posts.id
      ) AS total_views,
      COALESCE(array_agg(tags.slug ORDER BY post_tags.sort_order ASC, post_tags.created_at ASC, tags.name ASC) FILTER (WHERE tags.slug IS NOT NULL), '{}') AS tags
    FROM posts
    LEFT JOIN post_tags ON post_tags.post_id = posts.id
    LEFT JOIN tags ON tags.id = post_tags.tag_id
    WHERE (
        ${normalizedStatus} = 'all'
        OR (
          ${normalizedStatus} = 'published'
          AND posts.status = 'published'
          AND (posts.published_at IS NULL OR posts.published_at <= now())
        )
        OR (
          ${normalizedStatus} = 'scheduled'
          AND posts.status = 'published'
          AND posts.published_at > now()
        )
        OR (${normalizedStatus} = 'draft' AND posts.status = 'draft')
        OR (${normalizedStatus} = 'members' AND posts.status = 'members')
        OR (${normalizedStatus} = 'private' AND posts.status = 'private')
      )
      AND (${normalizedFeatured} <> 'featured' OR posts.is_featured = true)
      AND (
        ${normalizedTagSlug || null}::text IS NULL
        OR EXISTS (
          SELECT 1
          FROM post_tags filtered_post_tags
          INNER JOIN tags filtered_tags ON filtered_tags.id = filtered_post_tags.tag_id
          WHERE filtered_post_tags.post_id = posts.id
            AND filtered_tags.slug = ${normalizedTagSlug || null}
        )
      )
      AND (
        ${searchPattern}::text IS NULL
        OR posts.title ILIKE ${searchPattern}
        OR posts.slug ILIKE ${searchPattern}
        OR posts.excerpt ILIKE ${searchPattern}
        OR EXISTS (
          SELECT 1
          FROM post_tags search_post_tags
          INNER JOIN tags search_tags ON search_tags.id = search_post_tags.tag_id
          WHERE search_post_tags.post_id = posts.id
            AND (search_tags.name ILIKE ${searchPattern} OR search_tags.slug ILIKE ${searchPattern})
        )
      )
    GROUP BY
      posts.id,
      posts.title,
      posts.slug,
      posts.author_id,
      posts.excerpt,
      posts.featured_image,
      posts.show_featured_image,
      posts.is_featured,
      posts.admin_pinned,
      posts.status,
      posts.published_at,
      posts.created_at,
      posts.updated_at
    ORDER BY
      posts.admin_pinned DESC,
      CASE WHEN ${normalizedSortOrder} = 'oldest' THEN COALESCE(posts.published_at, posts.updated_at) END ASC,
      CASE WHEN ${normalizedSortOrder} <> 'oldest' THEN COALESCE(posts.published_at, posts.updated_at) END DESC,
      posts.id DESC
    LIMIT ${paged ? pageSize : 100000}
    OFFSET ${paged ? offset : 0}
  `

  const backlinkCounts = await getAdminPostBacklinkCountMap(rows)
  const mapAdminPostSummaryRowWithBacklinks = (row) => ({
    ...mapAdminPostSummaryRow(row),
    backlinkCount: backlinkCounts.get(row.id) || 0
  })

  if (!paged) {
    return rows.map(mapAdminPostSummaryRowWithBacklinks)
  }

  const countsRows = await sql`
    SELECT
      COUNT(*)::int AS total,
      COUNT(*) FILTER (WHERE posts.is_featured = true)::int AS featured,
      COUNT(*) FILTER (WHERE posts.admin_pinned = true)::int AS pinned
    FROM posts
  `

  const totalRows = await sql`
    SELECT COUNT(*)::int AS total
    FROM posts
    WHERE (
        ${normalizedStatus} = 'all'
        OR (
          ${normalizedStatus} = 'published'
          AND posts.status = 'published'
          AND (posts.published_at IS NULL OR posts.published_at <= now())
        )
        OR (
          ${normalizedStatus} = 'scheduled'
          AND posts.status = 'published'
          AND posts.published_at > now()
        )
        OR (${normalizedStatus} = 'draft' AND posts.status = 'draft')
        OR (${normalizedStatus} = 'members' AND posts.status = 'members')
        OR (${normalizedStatus} = 'private' AND posts.status = 'private')
      )
      AND (${normalizedFeatured} <> 'featured' OR posts.is_featured = true)
      AND (
        ${normalizedTagSlug || null}::text IS NULL
        OR EXISTS (
          SELECT 1
          FROM post_tags filtered_post_tags
          INNER JOIN tags filtered_tags ON filtered_tags.id = filtered_post_tags.tag_id
          WHERE filtered_post_tags.post_id = posts.id
            AND filtered_tags.slug = ${normalizedTagSlug || null}
        )
      )
      AND (
        ${searchPattern}::text IS NULL
        OR posts.title ILIKE ${searchPattern}
        OR posts.slug ILIKE ${searchPattern}
        OR posts.excerpt ILIKE ${searchPattern}
        OR EXISTS (
          SELECT 1
          FROM post_tags search_post_tags
          INNER JOIN tags search_tags ON search_tags.id = search_post_tags.tag_id
          WHERE search_post_tags.post_id = posts.id
            AND (search_tags.name ILIKE ${searchPattern} OR search_tags.slug ILIKE ${searchPattern})
        )
      )
  `
  const total = Number(totalRows[0]?.total || 0)

  return {
    items: rows.map(mapAdminPostSummaryRowWithBacklinks),
    pagination: {
      page,
      pageSize,
      total,
      pageCount: Math.max(1, Math.ceil(total / pageSize))
    },
    counts: {
      total: Number(countsRows[0]?.total || 0),
      featured: Number(countsRows[0]?.featured || 0),
      pinned: Number(countsRows[0]?.pinned || 0)
    }
  }
}

/**
 * 미디어 사용처 계산용 게시물 참조 목록 조회
 * @returns {Promise<Array<{ id: string, title: string, slug: string, status: string, featuredImage: string | null, content: string }>>} 게시물 미디어 참조 목록
 */
export const listMediaReferencePosts = async () => {
  const sql = getPostgresClient()

  if (!sql) {
    return getSamplePosts().map((post) => ({
      id: post.id,
      title: post.title,
      slug: post.slug,
      status: post.status,
      featuredImage: post.featuredImage,
      content: post.content || ''
    }))
  }

  const rows = await sql`
    SELECT
      id,
      title,
      slug,
      status,
      featured_image,
      content
    FROM posts
    ORDER BY updated_at DESC
  `

  return rows.map((row) => ({
    id: row.id,
    title: toAdminPostFormTitle(row.title),
    slug: row.slug,
    status: row.status,
    featuredImage: row.featured_image,
    content: row.content || ''
  }))
}

/**
 * 게시물을 링크하고 있는 관리자 콘텐츠 목록을 조회한다.
 * @param {string} id - 참조 대상 게시물 ID
 * @returns {Promise<{ target: { id: string, title: string, slug: string }, posts: Array<{ id: string, title: string, slug: string, status: string, publishedAt: string | null, updatedAt: string }>, pages: Array<{ id: string, title: string, slug: string, status: string, updatedAt: string }> } | null>} 참조 콘텐츠 목록
 */
export const listAdminPostReferences = async (id) => {
  const sql = getPostgresClient()
  const target = await getAdminPostById(id)

  if (!target) {
    return null
  }

  const mapReferenceRow = (post) => ({
    id: post.id,
    title: toAdminPostFormTitle(post.title),
    slug: post.slug,
    status: post.status,
    publishedAt: post.published_at
      ? post.published_at.toISOString()
      : post.publishedAt || null,
    updatedAt: post.updated_at
      ? post.updated_at.toISOString()
      : post.updatedAt || '',
    referenceCount: countPostLinkReferences(post.content, target.slug)
  })

  const removeReferenceCount = ({ referenceCount, ...post }) => post
  const mapReferencePageRow = (page) => ({
    id: page.id,
    title: toAdminPostFormTitle(page.title),
    slug: page.slug,
    status: page.status,
    updatedAt: page.updated_at
      ? page.updated_at.toISOString()
      : page.updatedAt || '',
    referenceCount: countPostLinkReferences(page.content, target.slug)
  })

  if (!sql) {
    const posts = getSamplePosts()
      .filter((post) => post.id !== target.id)
      .map(mapReferenceRow)
      .filter((post) => post.referenceCount > 0)
      .map(removeReferenceCount)
    const pages = getSamplePages()
      .map(mapReferencePageRow)
      .filter((page) => page.referenceCount > 0)
      .map(removeReferenceCount)

    return {
      target: {
        id: target.id,
        title: target.title,
        slug: target.slug
      },
      posts,
      pages
    }
  }

  const rows = await sql`
    SELECT
      id,
      title,
      slug,
      status,
      published_at,
      updated_at,
      content
    FROM posts
    WHERE id <> ${target.id}
      AND content ILIKE ${`%/post/${target.slug}%`}
    ORDER BY updated_at DESC
  `
  const pageRows = await sql`
    SELECT
      id,
      title,
      slug,
      status,
      updated_at,
      content
    FROM pages
    WHERE content ILIKE ${`%/post/${target.slug}%`}
    ORDER BY updated_at DESC
  `

  return {
    target: {
      id: target.id,
      title: target.title,
      slug: target.slug
    },
    posts: rows
      .map(mapReferenceRow)
      .filter((post) => post.referenceCount > 0)
      .map(removeReferenceCount),
    pages: pageRows
      .map(mapReferencePageRow)
      .filter((page) => page.referenceCount > 0)
      .map(removeReferenceCount)
  }
}

/**
 * 관리자 게시물 상세 조회
 * @param {string} id - 게시물 ID
 * @returns {Promise<Object | null>} 관리자 게시물 상세
 */
export const getAdminPostById = async (id) => {
  const sql = getPostgresClient()

  if (!sql) {
    return getSamplePosts().find((post) => post.id === id) || null
  }

  const rows = await sql`
    SELECT
      posts.*,
      (
        SELECT COUNT(*)::int
        FROM comments
        WHERE comments.post_id = posts.id
          AND comments.status = 'published'
      ) AS comment_count,
      COALESCE(array_agg(tags.slug ORDER BY post_tags.sort_order ASC, post_tags.created_at ASC, tags.name ASC) FILTER (WHERE tags.slug IS NOT NULL), '{}') AS tags
    FROM posts
    LEFT JOIN post_tags ON post_tags.post_id = posts.id
    LEFT JOIN tags ON tags.id = post_tags.tag_id
    WHERE posts.id = ${id}
    GROUP BY posts.id
    LIMIT 1
  `

  return rows[0] ? mapAdminPostRow(rows[0]) : null
}

/**
 * 관리자 게시물 생성
 * @param {Object} input - 게시물 입력값
 * @param {string} authorId - 작성자 회원 ID
 * @returns {Promise<Object>} 생성된 게시물
 */
export const createAdminPost = async (input, authorId) => {
  const sql = getPostgresClient()

  if (!sql) {
    throw new Error('DATABASE_REQUIRED')
  }

  const rows = await sql.begin(async (transaction) => {
    const insertedRows = await transaction`
      INSERT INTO posts (
        title,
        slug,
        author_id,
        content,
        excerpt,
        featured_image,
        show_featured_image,
        is_featured,
        seo_title,
        seo_description,
        canonical_url,
        noindex,
        og_image,
        status,
        published_at
      )
      VALUES (
        ${input.title},
        ${input.slug},
        ${authorId || null},
        ${input.content},
        ${input.excerpt},
        ${input.featuredImage},
        ${input.showFeaturedImage},
        ${input.isFeatured},
        ${input.seoTitle},
        ${input.seoDescription},
        ${input.canonicalUrl},
        ${input.noindex},
        ${input.ogImage},
        ${input.status},
        ${input.publishedAt}
      )
      RETURNING *
    `

    await syncPostTags(transaction, insertedRows[0].id, input.tags, input.tagNames)

    return insertedRows
  })

  await Promise.all([
    createPostThumbnailForImageUrl(input.featuredImage),
    createPostBodyThumbnailsForContent(input.content),
    syncContentMediaReferences('post', rows[0].id, input)
  ])

  return getAdminPostById(rows[0].id)
}

/**
 * 관리자 게시물 수정
 * @param {string} id - 게시물 ID
 * @param {Object} input - 게시물 입력값
 * @param {string} editorId - 수정자 회원 ID
 * @returns {Promise<Object | null>} 수정된 게시물
 */
export const updateAdminPost = async (id, input, editorId) => {
  const sql = getPostgresClient()

  if (!sql) {
    throw new Error('DATABASE_REQUIRED')
  }

  const rows = await sql.begin(async (transaction) => {
    const updatedRows = await transaction`
      UPDATE posts
      SET
        title = ${input.title},
        slug = ${input.slug},
        author_id = COALESCE(author_id, ${editorId || null}),
        content = ${input.content},
        excerpt = ${input.excerpt},
        featured_image = ${input.featuredImage},
        show_featured_image = ${input.showFeaturedImage},
        is_featured = ${input.isFeatured},
        seo_title = ${input.seoTitle},
        seo_description = ${input.seoDescription},
        canonical_url = ${input.canonicalUrl},
        noindex = ${input.noindex},
        og_image = ${input.ogImage},
        status = ${input.status},
        published_at = ${input.publishedAt},
        updated_at = now()
      WHERE id = ${id}
      RETURNING *
    `

    if (!updatedRows[0]) {
      return []
    }

    await syncPostTags(transaction, id, input.tags, input.tagNames)

    return updatedRows
  })

  if (rows[0]) {
    await Promise.all([
      createPostThumbnailForImageUrl(input.featuredImage),
      createPostBodyThumbnailsForContent(input.content),
      syncContentMediaReferences('post', rows[0].id, input)
    ])
  }

  return rows[0] ? getAdminPostById(rows[0].id) : null
}

/**
 * 관리자 게시물 추천 상태 수정
 * @param {string} id - 게시물 ID
 * @param {boolean} isFeatured - 추천 여부
 * @returns {Promise<Object | null>} 수정된 게시물
 */
export const updateAdminPostFeatured = async (id, isFeatured) => {
  const sql = getPostgresClient()

  if (!sql) {
    throw new Error('DATABASE_REQUIRED')
  }

  const rows = await sql`
    UPDATE posts
    SET
      is_featured = ${Boolean(isFeatured)},
      updated_at = now()
    WHERE id = ${id}
    RETURNING id
  `

  return rows[0] ? getAdminPostById(rows[0].id) : null
}

/**
 * 관리자 게시물 고정 상태 수정
 * @param {string} id - 게시물 ID
 * @param {boolean} adminPinned - 관리자 목록 상단 고정 여부
 * @returns {Promise<Object | null>} 수정된 게시물
 */
export const updateAdminPostPinned = async (id, adminPinned) => {
  const sql = getPostgresClient()

  if (!sql) {
    throw new Error('DATABASE_REQUIRED')
  }

  const rows = await sql`
    UPDATE posts
    SET
      admin_pinned = ${Boolean(adminPinned)},
      updated_at = now()
    WHERE id = ${id}
    RETURNING id
  `

  return rows[0] ? getAdminPostById(rows[0].id) : null
}

/**
 * 관리자 게시물 삭제
 * @param {string} id - 게시물 ID
 * @returns {Promise<boolean>} 삭제 여부
 */
export const deleteAdminPost = async (id) => {
  const sql = getPostgresClient()

  if (!sql) {
    throw new Error('DATABASE_REQUIRED')
  }

  const rows = await sql`
    DELETE FROM posts
    WHERE id = ${id}
    RETURNING id
  `

  return Boolean(rows[0])
}

/**
 * 공개 게시물 상세 조회
 * @param {string} slug - 게시물 슬러그
 * @param {{ includeMembership?: boolean }} [options] - VIP 전용 글 포함 여부
 * @returns {Promise<Object | null>} 게시물 상세
 */
export const getPostBySlug = async (slug, { includeMembership = false } = {}) => {
  const sql = getPostgresClient()

  if (!sql) {
    return getSamplePostBySlug(slug)
  }

  const rows = await sql`
    SELECT
      posts.*,
      (
        SELECT COUNT(*)::int
        FROM comments
        WHERE comments.post_id = posts.id
          AND comments.status = 'published'
      ) AS comment_count,
      COALESCE(array_agg(tags.slug ORDER BY post_tags.sort_order ASC, post_tags.created_at ASC, tags.name ASC) FILTER (WHERE tags.slug IS NOT NULL), '{}') AS tags
    FROM posts
    LEFT JOIN post_tags ON post_tags.post_id = posts.id
    LEFT JOIN tags ON tags.id = post_tags.tag_id
    WHERE posts.slug = ${slug}
      AND (
        posts.status = 'published'
        OR (${includeMembership} = true AND posts.status = 'members')
      )
      AND (
        posts.status = 'members'
        OR posts.published_at IS NULL
        OR posts.published_at <= now()
      )
    GROUP BY posts.id
    LIMIT 1
  `

  return rows[0] ? mapPostRow(rows[0]) : null
}

/**
 * 공개 게시물 상세의 이전(더 예전)·다음(더 최신) 글을 조회한다.
 * 목록과 같은 정렬(발행일 DESC) 기준으로 인접 글의 제목·슬러그만 반환한다.
 * @param {string} slug - 기준 게시물 슬러그
 * @param {{ includeMembership?: boolean }} [options] - 조회 옵션
 * @returns {Promise<{ previous: { title: string, slug: string } | null, next: { title: string, slug: string } | null }>} 인접 글
 */
export const getAdjacentPosts = async (slug, { includeMembership = false } = {}) => {
  const sql = getPostgresClient()

  if (!sql) {
    const samplePosts = getSamplePosts()
      .filter((post) => post.status === 'published' && (!post.publishedAt || new Date(post.publishedAt) <= new Date()))
      .sort((left, right) => {
        const leftTime = new Date(left.publishedAt || left.createdAt || 0).getTime()
        const rightTime = new Date(right.publishedAt || right.createdAt || 0).getTime()
        return rightTime - leftTime
      })
    const index = samplePosts.findIndex((post) => post.slug === slug)
    if (index === -1) {
      return { previous: null, next: null }
    }
    const toNeighbor = (post) => (post ? { title: post.title, slug: post.slug } : null)
    return {
      previous: index < samplePosts.length - 1 ? toNeighbor(samplePosts[index + 1]) : null,
      next: index > 0 ? toNeighbor(samplePosts[index - 1]) : null
    }
  }

  const rows = await sql`
    WITH ordered AS (
      SELECT
        posts.slug,
        posts.title,
        LAG(posts.slug) OVER w AS previous_slug,
        LAG(posts.title) OVER w AS previous_title,
        LEAD(posts.slug) OVER w AS next_slug,
        LEAD(posts.title) OVER w AS next_title
      FROM posts
      WHERE (
          posts.status = 'published'
          OR (${includeMembership} = true AND posts.status = 'members')
        )
        AND (
          posts.status = 'members'
          OR posts.published_at IS NULL
          OR posts.published_at <= now()
        )
      WINDOW w AS (ORDER BY posts.published_at DESC NULLS LAST, posts.created_at DESC)
    )
    SELECT previous_slug, previous_title, next_slug, next_title
    FROM ordered
    WHERE slug = ${slug}
    LIMIT 1
  `

  const row = rows[0]
  if (!row) {
    return { previous: null, next: null }
  }

  return {
    previous: row.next_slug ? { title: row.next_title, slug: row.next_slug } : null,
    next: row.previous_slug ? { title: row.previous_title, slug: row.previous_slug } : null
  }
}

/**
 * 공개 고정 페이지 목록 조회
 * @param {{ listedOnly?: boolean, limitPerSection?: number|null }} [options] - 조회 옵션
 * @returns {Promise<Array>} 고정 페이지 목록
 */
export const listPages = async (options = {}) => {
  const sql = getPostgresClient()
  const listedOnly = Boolean(options.listedOnly)
  const limitPerSection = Number.isInteger(options.limitPerSection) && options.limitPerSection > 0
    ? options.limitPerSection
    : null

  if (!sql) {
    const pages = getSamplePages().filter((page) => page.status === 'published')
    if (!listedOnly) {
      return pages
    }

    const sectionCounts = new Map()
    return pages
      .filter((page) => page.isListed)
      .filter((page) => {
        if (!limitPerSection) {
          return true
        }
        const sectionName = String(page.listingSection || '').trim() || 'Pages'
        const count = Number(sectionCounts.get(sectionName) || 0) + 1
        sectionCounts.set(sectionName, count)
        return count <= limitPerSection
      })
      .map((page) => ({ ...page, content: '' }))
  }

  if (listedOnly) {
    const rows = await sql`
      SELECT *
      FROM (
        SELECT
          pages.id,
          pages.title,
          pages.slug,
          '' AS content,
          pages.render_mode,
          pages.status,
          pages.featured_image,
          pages.is_listed,
          pages.is_featured,
          pages.listing_section,
          pages.listing_title,
          pages.listing_description,
          pages.listing_sort_order,
          pages.created_at,
          pages.updated_at,
          COALESCE(page_listing_sections.sort_order, 9999) AS section_sort_order,
          row_number() OVER (
            PARTITION BY COALESCE(NULLIF(pages.listing_section, ''), 'Pages')
            ORDER BY
              pages.is_featured DESC,
              pages.listing_sort_order ASC,
              pages.updated_at DESC,
              pages.created_at DESC
          ) AS section_row_number
        FROM pages
        LEFT JOIN page_listing_sections
          ON page_listing_sections.name = pages.listing_section
        WHERE pages.status = 'published'
          AND pages.is_listed = true
      ) listed_pages
      WHERE (${limitPerSection || null}::int IS NULL OR listed_pages.section_row_number <= ${limitPerSection || null})
      ORDER BY
        listed_pages.section_sort_order ASC,
        listed_pages.listing_section ASC,
        listed_pages.is_featured DESC,
        listed_pages.listing_sort_order ASC,
        listed_pages.updated_at DESC,
        listed_pages.created_at DESC
    `

    return rows.map(mapPageRow)
  }

  const rows = await sql`
    SELECT pages.*
    FROM pages
    LEFT JOIN page_listing_sections
      ON page_listing_sections.name = pages.listing_section
    WHERE status = 'published'
      AND (${listedOnly} = false OR is_listed = true)
    ORDER BY
      COALESCE(page_listing_sections.sort_order, 9999) ASC,
      listing_section ASC,
      is_featured DESC,
      listing_sort_order ASC,
      updated_at DESC,
      created_at DESC
  `

  return rows.map(mapPageRow)
}

/**
 * 미디어 사용처 계산용 페이지 참조 목록 조회
 * @returns {Promise<Array<{ id: string, title: string, slug: string, status: string, featuredImage: string | null, content: string }>>} 페이지 미디어 참조 목록
 */
export const listMediaReferencePages = async () => {
  const sql = getPostgresClient()

  if (!sql) {
    return getSamplePages().map((page) => ({
      id: page.id,
      title: page.title,
      slug: page.slug,
      status: page.status,
      featuredImage: page.featuredImage,
      content: page.content || ''
    }))
  }

  const rows = await sql`
    SELECT
      id,
      title,
      slug,
      status,
      featured_image,
      content
    FROM pages
    ORDER BY updated_at DESC
  `

  return rows.map((row) => ({
    id: row.id,
    title: row.title,
    slug: row.slug,
    status: row.status,
    featuredImage: row.featured_image,
    content: row.content || ''
  }))
}

/**
 * 관리자 고정 페이지 목록 조회
 * @returns {Promise<Array>} 관리자 고정 페이지 목록
 */
export const listAdminPages = async () => {
  const sql = getPostgresClient()

  if (!sql) {
    return getSamplePages()
  }

  const rows = await sql`
    SELECT
      pages.*,
      (
        SELECT COALESCE(SUM(page_analytics_daily.views), 0)::int
        FROM page_analytics_daily
        WHERE page_analytics_daily.page_id = pages.id
      ) AS total_views
    FROM pages
    ORDER BY created_at DESC
  `

  return rows.map(mapPageRow)
}

/**
 * 관리자 고정 페이지 상세 조회
 * @param {string} id - 페이지 ID
 * @returns {Promise<Object | null>} 관리자 고정 페이지 상세
 */
export const getAdminPageById = async (id) => {
  const sql = getPostgresClient()

  if (!sql) {
    return getSamplePages().find((page) => page.id === id) || null
  }

  const rows = await sql`
    SELECT *
    FROM pages
    WHERE id = ${id}
    LIMIT 1
  `

  return rows[0] ? mapPageRow(rows[0]) : null
}

/**
 * 관리자 페이지 섹션 목록 조회
 * @returns {Promise<Array>} 페이지 섹션 목록
 */
export const listAdminPageSections = async () => {
  const sql = getPostgresClient()

  if (!sql) {
    const sections = new Map()
    for (const page of getSamplePages()) {
      const name = String(page.listingSection || '').trim()
      if (!name) {
        continue
      }
      sections.set(name, {
        id: `sample-page-section-${sections.size + 1}`,
        name,
        sortOrder: sections.size * 10,
        pageCount: (sections.get(name)?.pageCount || 0) + 1,
        createdAt: page.createdAt,
        updatedAt: page.updatedAt
      })
    }
    return [...sections.values()]
  }

  const rows = await sql`
    SELECT
      page_listing_sections.*,
      (
        SELECT COUNT(*)::int
        FROM pages
        WHERE pages.listing_section = page_listing_sections.name
      ) AS page_count
    FROM page_listing_sections
    ORDER BY sort_order ASC, name ASC
  `

  return rows.map(mapPageSectionRow)
}

/**
 * 관리자 페이지 섹션 생성
 * @param {string} name - 섹션명
 * @returns {Promise<Object>} 생성된 페이지 섹션
 */
export const createAdminPageSection = async (name) => {
  const sql = getPostgresClient()

  if (!sql) {
    throw new Error('DATABASE_REQUIRED')
  }

  const rows = await sql`
    INSERT INTO page_listing_sections (name, sort_order)
    VALUES (
      ${name},
      COALESCE((SELECT MAX(sort_order) + 10 FROM page_listing_sections), 0)
    )
    RETURNING *, 0::int AS page_count
  `

  return mapPageSectionRow(rows[0])
}

/**
 * 관리자 페이지 섹션 수정
 * @param {string} id - 섹션 ID
 * @param {{ name: string }} input - 수정 입력값
 * @returns {Promise<Object | null>} 수정된 페이지 섹션
 */
export const updateAdminPageSection = async (id, input) => {
  const sql = getPostgresClient()

  if (!sql) {
    throw new Error('DATABASE_REQUIRED')
  }

  const currentRows = await sql`
    SELECT *
    FROM page_listing_sections
    WHERE id = ${id}
    LIMIT 1
  `

  if (!currentRows[0]) {
    return null
  }

  await sql.begin(async (transaction) => {
    await transaction`
      UPDATE page_listing_sections
      SET name = ${input.name}, updated_at = now()
      WHERE id = ${id}
    `
    await transaction`
      UPDATE pages
      SET listing_section = ${input.name}, updated_at = now()
      WHERE listing_section = ${currentRows[0].name}
    `
  })

  const rows = await sql`
    SELECT
      page_listing_sections.*,
      (
        SELECT COUNT(*)::int
        FROM pages
        WHERE pages.listing_section = page_listing_sections.name
      ) AS page_count
    FROM page_listing_sections
    WHERE id = ${id}
    LIMIT 1
  `

  return rows[0] ? mapPageSectionRow(rows[0]) : null
}

/**
 * 관리자 페이지 섹션 삭제
 * @param {string} id - 섹션 ID
 * @returns {Promise<boolean>} 삭제 여부
 */
export const deleteAdminPageSection = async (id) => {
  const sql = getPostgresClient()

  if (!sql) {
    throw new Error('DATABASE_REQUIRED')
  }

  const rows = await sql`
    DELETE FROM page_listing_sections
    WHERE id = ${id}
      AND NOT EXISTS (
        SELECT 1
        FROM pages
        WHERE pages.listing_section = page_listing_sections.name
      )
    RETURNING id
  `

  return Boolean(rows[0])
}

/**
 * 관리자 페이지 섹션 정렬 저장
 * @param {Array<string>} sectionIds - 섹션 ID 목록
 * @returns {Promise<Array>} 정렬 저장 후 섹션 목록
 */
export const reorderAdminPageSections = async (sectionIds) => {
  const sql = getPostgresClient()

  if (!sql) {
    throw new Error('DATABASE_REQUIRED')
  }

  await sql.begin(async (transaction) => {
    for (const [index, sectionId] of sectionIds.entries()) {
      await transaction`
        UPDATE page_listing_sections
        SET sort_order = ${index * 10}, updated_at = now()
        WHERE id = ${sectionId}
      `
    }
  })

  return listAdminPageSections()
}

/**
 * 관리자 페이지 섹션 내부 페이지 정렬 저장
 * @param {string} sectionId - 페이지 섹션 ID
 * @param {Array<string>} pageIds - 정렬할 페이지 ID 목록
 * @param {Array<string>} removedPageIds - 섹션에서 제거할 페이지 ID 목록
 * @returns {Promise<Array>} 정렬 저장 후 페이지 목록
 */
export const reorderAdminPageSectionPages = async (sectionId, pageIds, removedPageIds = []) => {
  const sql = getPostgresClient()

  if (!sql) {
    throw new Error('DATABASE_REQUIRED')
  }

  const sectionRows = await sql`
    SELECT *
    FROM page_listing_sections
    WHERE id = ${sectionId}
    LIMIT 1
  `

  if (!sectionRows[0]) {
    return null
  }

  const removedIdSet = new Set(removedPageIds.map((id) => String(id)))
  const nextPageIds = [...new Set(pageIds.map((id) => String(id)).filter((id) => !removedIdSet.has(id)))]
  const nextRemovedPageIds = [...removedIdSet]
  const targetPageIds = [...new Set([...nextPageIds, ...nextRemovedPageIds])]

  if (targetPageIds.length === 0) {
    return listAdminPages()
  }

  const pageRows = await sql`
    SELECT id
    FROM pages
    WHERE listing_section = ${sectionRows[0].name}
      AND is_listed = true
      AND id = ANY(${targetPageIds})
  `

  if (pageRows.length !== targetPageIds.length) {
    throw new Error('PAGE_SECTION_PAGE_MISMATCH')
  }

  await sql.begin(async (transaction) => {
    if (nextRemovedPageIds.length > 0) {
      await transaction`
        UPDATE pages
        SET listing_section = '', listing_sort_order = 0, updated_at = now()
        WHERE listing_section = ${sectionRows[0].name}
          AND is_listed = true
          AND id = ANY(${nextRemovedPageIds})
      `
    }

    for (const [index, pageId] of nextPageIds.entries()) {
      await transaction`
        UPDATE pages
        SET listing_sort_order = ${index * 10}, updated_at = now()
        WHERE id = ${pageId}
          AND listing_section = ${sectionRows[0].name}
          AND is_listed = true
      `
    }
  })

  return listAdminPages()
}

/**
 * 관리자 고정 페이지 생성
 * @param {Object} input - 페이지 입력값
 * @returns {Promise<Object>} 생성된 페이지
 */
export const createAdminPage = async (input) => {
  const sql = getPostgresClient()

  if (!sql) {
    throw new Error('DATABASE_REQUIRED')
  }

  const rows = await sql`
    INSERT INTO pages (
      title,
      slug,
      content,
      render_mode,
      featured_image,
      is_listed,
      is_featured,
      listing_section,
      listing_title,
      listing_description,
      listing_sort_order,
      status
    )
    VALUES (
      ${input.title},
      ${input.slug},
      ${input.content},
      ${input.renderMode},
      ${input.featuredImage},
      ${input.isListed},
      ${input.isFeatured},
      ${input.listingSection},
      ${input.listingTitle},
      ${input.listingDescription},
      ${input.listingSortOrder},
      ${input.status}
    )
    RETURNING *
  `

  await Promise.all([
    createPageCoverThumbnailForImageUrl(input.featuredImage),
    syncContentMediaReferences('page', rows[0].id, input)
  ])

  return mapPageRow(rows[0])
}

/**
 * 관리자 고정 페이지 수정
 * @param {string} id - 페이지 ID
 * @param {Object} input - 페이지 입력값
 * @returns {Promise<Object | null>} 수정된 페이지
 */
export const updateAdminPage = async (id, input) => {
  const sql = getPostgresClient()

  if (!sql) {
    throw new Error('DATABASE_REQUIRED')
  }

  const rows = await sql`
    UPDATE pages
    SET
      title = ${input.title},
      slug = ${input.slug},
      content = ${input.content},
      render_mode = ${input.renderMode},
      featured_image = ${input.featuredImage},
      is_listed = ${input.isListed},
      is_featured = ${input.isFeatured},
      listing_section = ${input.listingSection},
      listing_title = ${input.listingTitle},
      listing_description = ${input.listingDescription},
      listing_sort_order = ${input.listingSortOrder},
      status = ${input.status},
      updated_at = now()
    WHERE id = ${id}
    RETURNING *
  `

  if (rows[0]) {
    await Promise.all([
      createPageCoverThumbnailForImageUrl(input.featuredImage),
      syncContentMediaReferences('page', rows[0].id, input)
    ])
  }

  return rows[0] ? mapPageRow(rows[0]) : null
}

/**
 * 관리자 고정 페이지 삭제
 * @param {string} id - 페이지 ID
 * @returns {Promise<boolean>} 삭제 여부
 */
export const deleteAdminPage = async (id) => {
  const sql = getPostgresClient()

  if (!sql) {
    throw new Error('DATABASE_REQUIRED')
  }

  const rows = await sql`
    DELETE FROM pages
    WHERE id = ${id}
    RETURNING id
  `

  return Boolean(rows[0])
}

/**
 * 공개 고정 페이지 상세 조회
 * @param {string} slug - 페이지 슬러그
 * @returns {Promise<Object | null>} 고정 페이지 상세
 */
export const getPageBySlug = async (slug) => {
  const sql = getPostgresClient()

  if (!sql) {
    return getSamplePageBySlug(slug)
  }

  const rows = await sql`
    SELECT *
    FROM pages
    WHERE slug = ${slug}
      AND status = 'published'
    LIMIT 1
  `

  return rows[0] ? mapPageRow(rows[0]) : null
}

/**
 * 공개 태그 목록 조회
 * @returns {Promise<Array>} 태그 목록
 */
export const listTags = async ({ tagType, searchQuery = '', limit } = {}) => {
  const sql = getPostgresClient()
  const trimmedSearchQuery = String(searchQuery || '').trim().toLowerCase()
  const resolvedLimit = Number.isInteger(limit) && limit > 0 ? limit : null

  if (!sql) {
    const sampleTags = getSampleTags().map((tag) => ({
      ...tag,
      headerImageUrl: tag.headerImageUrl || '',
      headerTitle: tag.headerTitle || '',
      headerText: tag.headerText || '',
      tagType: 'managed',
      postCount: 0,
      lastUsedAt: null,
      updatedAt: null
    }))
    let filteredTags = sampleTags
    if (tagType) {
      filteredTags = filteredTags.filter((tag) => tag.tagType === tagType)
    }
    if (trimmedSearchQuery) {
      filteredTags = filteredTags.filter((tag) =>
        tag.name.toLowerCase().includes(trimmedSearchQuery) ||
        tag.slug.toLowerCase().includes(trimmedSearchQuery)
      )
    }
    return resolvedLimit ? filteredTags.slice(0, resolvedLimit) : filteredTags
  }

  const rows = await sql`
    SELECT
      tags.*,
      COUNT(posts.id)::int AS post_count,
      MAX(posts.updated_at) AS last_used_at
    FROM tags
    LEFT JOIN post_tags ON post_tags.tag_id = tags.id
    LEFT JOIN posts ON posts.id = post_tags.post_id
      AND posts.status = 'published'
      AND (
        posts.published_at IS NULL
        OR posts.published_at <= now()
      )
    WHERE (${tagType || null}::text IS NULL OR tag_type = ${tagType || null})
      AND (
        ${trimmedSearchQuery || null}::text IS NULL
        OR strpos(lower(tags.name), ${trimmedSearchQuery || ''}) > 0
        OR strpos(lower(tags.slug), ${trimmedSearchQuery || ''}) > 0
      )
    GROUP BY tags.id
    ORDER BY
      CASE tag_type WHEN 'managed' THEN 0 ELSE 1 END ASC,
      sort_order ASC,
      MAX(posts.updated_at) DESC NULLS LAST,
      tags.updated_at DESC,
      name ASC
    LIMIT ${resolvedLimit || 1000}
  `

  return rows.map(mapTagRow)
}

/**
 * 관리자 태그 목록 조회
 * @param {Object} options - 조회 옵션
 * @returns {Promise<Array>} 관리자 태그 목록
 */
export const listAdminTags = async (options = {}) => listTags(options)

const SEARCH_TAG_LIMIT = 12
const SEARCH_POST_LIMIT = 12
const SEARCH_PAGE_LIMIT = 8

/**
 * 공개 검색어를 비교 가능한 문자열로 정리한다.
 * @param {string} value - 원본 검색어
 * @returns {string} 정규화된 검색어
 */
const normalizeSearchQuery = (value) => String(value || '')
  .normalize('NFC')
  .replace(/\s+/g, ' ')
  .trim()

/**
 * 공개 검색에서 업로드 경로/파일명 같은 노이즈를 제거한다.
 * - 마크다운 이미지 문법 `![](...)` 제거
 * - 업로드 경로(`/uploads/...`) 제거
 * @param {string} value - 원문
 * @returns {string} 정규화된 문자열
 */
const normalizeSearchContent = (value) => String(value || '')
  .replace(/!\[[^\]]*]\([^)]*\)/g, ' ')
  .replace(/\/uploads\/[^\s)"]+/g, ' ')
  .replace(/\s+/g, ' ')
  .trim()

/**
 * 공개 검색: 태그·게시물 제목·요약·본문에서 부분 일치(대소문자 무시)
 * @param {string} rawQuery - 검색어
 * @returns {Promise<{ tags: Array<{ name: string, slug: string }>, posts: Array<{ slug: string, title: string, excerpt: string }>, pages: Array<{ slug: string, title: string, excerpt: string }> }>} 검색 요약 결과
 */
export const searchPublicContent = async (rawQuery) => {
  const q = normalizeSearchQuery(rawQuery)
  if (!q) {
    return { tags: [], posts: [], pages: [] }
  }
  const searchTextQuery = normalizeSearchContent(q).toLowerCase()
  if (!searchTextQuery) {
    return { tags: [], posts: [], pages: [] }
  }

  const sql = getPostgresClient()

  if (!sql) {
    const needle = searchTextQuery
    const posts = getSamplePosts()
      .filter((post) => {
        const hay = normalizeSearchContent(`${post.title}\n${post.excerpt || ''}\n${post.content || ''}`).toLowerCase()
        return hay.includes(needle)
      })
      .slice(0, SEARCH_POST_LIMIT)
      .map((post) => ({
        slug: post.slug,
        title: post.title,
        excerpt: post.excerpt || ''
      }))
    const tags = getSampleTags()
      .filter((tag) => {
        const hay = `${tag.name}\n${tag.slug}`.toLowerCase()
        return hay.includes(needle)
      })
      .slice(0, SEARCH_TAG_LIMIT)
      .map((tag) => ({
        name: tag.name,
        slug: tag.slug
      }))
    const pages = getSamplePages()
      .filter((page) => {
        const hay = normalizeSearchContent(`${page.listingSection || ''}\n${page.listingTitle || page.title}\n${page.listingDescription || ''}\n${page.content || ''}`).toLowerCase()
        return page.isListed && hay.includes(needle)
      })
      .slice(0, SEARCH_PAGE_LIMIT)
      .map((page) => ({
        slug: page.slug,
        title: page.listingTitle || page.title,
        excerpt: page.listingDescription || ''
      }))

    return { tags, posts, pages }
  }
  const searchPattern = `%${searchTextQuery}%`
  const searchPrefixPattern = `${searchTextQuery}%`

  const tagRows = await sql`
    SELECT name, slug
    FROM tags
    WHERE
      lower(name) LIKE ${searchPattern}
      OR lower(slug) LIKE ${searchPattern}
    ORDER BY
      CASE
        WHEN lower(name) = ${searchTextQuery} OR lower(slug) = ${searchTextQuery} THEN 0
        WHEN lower(name) LIKE ${searchPrefixPattern} OR lower(slug) LIKE ${searchPrefixPattern} THEN 1
        ELSE 2
      END,
      sort_order ASC,
      name ASC
    LIMIT ${SEARCH_TAG_LIMIT}
  `

  const postRows = await sql`
    SELECT posts.slug, posts.title, posts.excerpt
    FROM posts
    WHERE posts.status = 'published'
      AND (posts.published_at IS NULL OR posts.published_at <= now())
      AND posts.search_text LIKE ${searchPattern}
    ORDER BY
      CASE
        WHEN lower(posts.title) = ${searchTextQuery} THEN 0
        WHEN lower(posts.title) LIKE ${searchPrefixPattern} THEN 1
        WHEN lower(coalesce(posts.excerpt, '')) LIKE ${searchPrefixPattern} THEN 2
        ELSE 3
      END,
      posts.published_at DESC NULLS LAST,
      posts.created_at DESC
    LIMIT ${SEARCH_POST_LIMIT}
  `

  const pageRows = await sql`
    SELECT slug, title, listing_section, listing_title, listing_description
    FROM pages
    WHERE status = 'published'
      AND is_listed = true
      AND search_text LIKE ${searchPattern}
    ORDER BY
      CASE
        WHEN lower(coalesce(listing_title, title)) = ${searchTextQuery} THEN 0
        WHEN lower(coalesce(listing_title, title)) LIKE ${searchPrefixPattern} THEN 1
        WHEN lower(coalesce(listing_description, '')) LIKE ${searchPrefixPattern} THEN 2
        ELSE 3
      END,
      is_featured DESC,
      listing_section ASC,
      listing_sort_order ASC,
      updated_at DESC
    LIMIT ${SEARCH_PAGE_LIMIT}
  `

  return {
    tags: tagRows.map((row) => ({ name: row.name, slug: row.slug })),
    posts: postRows.map((row) => ({
      slug: row.slug,
      title: row.title,
      excerpt: row.excerpt || ''
    })),
    pages: pageRows.map((row) => ({
      slug: row.slug,
      title: row.listing_title || row.title,
      excerpt: row.listing_description || ''
    }))
  }
}

/**
 * 사이트 설정 조회
 * @returns {Promise<Object>} 사이트 설정
 */
export const getSiteSettings = async () => {
  const sql = getPostgresClient()

  if (!sql) {
    return getDefaultSiteSettings()
  }

  const rows = await sql`
    SELECT *
    FROM site_settings
    WHERE id = 1
    LIMIT 1
  `

  return rows[0] ? mapSiteSettingsRow(rows[0]) : getDefaultSiteSettings()
}

/**
 * 관리자 사이트 설정 수정
 * @param {Object} input - 사이트 설정 입력값
 * @returns {Promise<Object>} 수정된 사이트 설정
 */
export const updateSiteSettings = async (input) => {
  const sql = getPostgresClient()

  if (!sql) {
    throw new Error('DATABASE_REQUIRED')
  }

  const rows = await sql`
    INSERT INTO site_settings (
      id,
      title,
      description,
      site_url,
      logo_text,
      logo_url,
      favicon_url,
      copyright_text,
      social_links,
      show_post_updated_at,
      post_tag_limit,
      home_latest_post_limit,
      post_list_page_size,
      tag_post_list_page_size,
      featured_post_limit,
      page_section_item_limit,
      upload_max_file_count,
      upload_max_total_size,
      home_cover_image_url,
      home_cover_dark_image_url,
      home_cover_title,
      home_cover_text,
      brand_color,
      announcement_enabled,
      announcement_text,
      announcement_url,
      announcement_background_color,
      announcement_alignment,
      signup_blocked_usernames,
      ads_txt,
      custom_head_code,
      custom_footer_code,
      ad_home_feed_code,
      ad_home_infeed_code,
      ad_sidebar_code,
      ad_post_sidebar_code,
      ad_post_top_code,
      ad_post_in_article_code,
      ad_post_bottom_code,
      updated_at
    )
    VALUES (
      1,
      ${input.title},
      ${input.description},
      ${input.siteUrl},
      ${input.logoText || '井'},
      ${input.logoUrl || ''},
      ${input.faviconUrl || ''},
      ${input.copyrightText},
      ${JSON.stringify(normalizeSocialLinks(input.socialLinks))}::jsonb,
      ${input.showPostUpdatedAt ? true : false},
      ${normalizePostTagLimit(input.postTagLimit)},
      ${normalizeDisplayCount(input.homeLatestPostLimit, DEFAULT_HOME_LATEST_POST_LIMIT)},
      ${normalizeDisplayCount(input.postListPageSize, DEFAULT_POST_LIST_PAGE_SIZE)},
      ${normalizeDisplayCount(input.tagPostListPageSize, DEFAULT_TAG_POST_LIST_PAGE_SIZE)},
      ${normalizeDisplayCount(input.featuredPostLimit, DEFAULT_FEATURED_POST_LIMIT)},
      ${normalizeDisplayCount(input.pageSectionItemLimit, DEFAULT_PAGE_SECTION_ITEM_LIMIT)},
      ${normalizeUploadMaxFileCount(input.uploadMaxFileCount)},
      ${normalizeUploadMaxTotalSize(input.uploadMaxTotalSize)},
      ${input.homeCoverImageUrl || ''},
      ${input.homeCoverDarkImageUrl || ''},
      ${input.homeCoverTitle || ''},
      ${input.homeCoverText || ''},
      ${normalizeBrandColor(input.brandColor)},
      ${input.announcementEnabled ? true : false},
      ${input.announcementText || ''},
      ${input.announcementUrl || ''},
      ${normalizeAnnouncementBackgroundColor(input.announcementBackgroundColor)},
      ${normalizeAnnouncementAlignment(input.announcementAlignment)},
      ${JSON.stringify(normalizeSignupBlockedUsernames(input.signupBlockedUsernames))},
      ${input.adsTxt || ''},
      ${input.customHeadCode || ''},
      ${input.customFooterCode || ''},
      ${input.adHomeFeedCode || ''},
      ${input.adHomeInfeedCode || ''},
      ${input.adSidebarCode || ''},
      ${input.adPostSidebarCode || ''},
      ${input.adPostTopCode || ''},
      ${input.adPostInArticleCode || ''},
      ${input.adPostBottomCode || ''},
      now()
    )
    ON CONFLICT (id) DO UPDATE
    SET
      title = EXCLUDED.title,
      description = EXCLUDED.description,
      site_url = EXCLUDED.site_url,
      logo_text = EXCLUDED.logo_text,
      logo_url = EXCLUDED.logo_url,
      favicon_url = EXCLUDED.favicon_url,
      copyright_text = EXCLUDED.copyright_text,
      social_links = EXCLUDED.social_links,
      show_post_updated_at = EXCLUDED.show_post_updated_at,
      post_tag_limit = EXCLUDED.post_tag_limit,
      home_latest_post_limit = EXCLUDED.home_latest_post_limit,
      post_list_page_size = EXCLUDED.post_list_page_size,
      tag_post_list_page_size = EXCLUDED.tag_post_list_page_size,
      featured_post_limit = EXCLUDED.featured_post_limit,
      page_section_item_limit = EXCLUDED.page_section_item_limit,
      upload_max_file_count = EXCLUDED.upload_max_file_count,
      upload_max_total_size = EXCLUDED.upload_max_total_size,
      home_cover_image_url = EXCLUDED.home_cover_image_url,
      home_cover_dark_image_url = EXCLUDED.home_cover_dark_image_url,
      home_cover_title = EXCLUDED.home_cover_title,
      home_cover_text = EXCLUDED.home_cover_text,
      brand_color = EXCLUDED.brand_color,
      announcement_enabled = EXCLUDED.announcement_enabled,
      announcement_text = EXCLUDED.announcement_text,
      announcement_url = EXCLUDED.announcement_url,
      announcement_background_color = EXCLUDED.announcement_background_color,
      announcement_alignment = EXCLUDED.announcement_alignment,
      signup_blocked_usernames = EXCLUDED.signup_blocked_usernames,
      ads_txt = EXCLUDED.ads_txt,
      custom_head_code = EXCLUDED.custom_head_code,
      custom_footer_code = EXCLUDED.custom_footer_code,
      ad_home_feed_code = EXCLUDED.ad_home_feed_code,
      ad_home_infeed_code = EXCLUDED.ad_home_infeed_code,
      ad_sidebar_code = EXCLUDED.ad_sidebar_code,
      ad_post_sidebar_code = EXCLUDED.ad_post_sidebar_code,
      ad_post_top_code = EXCLUDED.ad_post_top_code,
      ad_post_in_article_code = EXCLUDED.ad_post_in_article_code,
      ad_post_bottom_code = EXCLUDED.ad_post_bottom_code,
      updated_at = now()
    RETURNING *
  `

  const settings = mapSiteSettingsRow(rows[0])
  await syncSiteSettingsMediaReferences(settings)
  return settings
}

/**
 * 전달된 사이트 설정 필드만 원자적으로 수정한다.
 * @param {Object} input - 부분 사이트 설정 입력값
 * @returns {Promise<Object>} 수정된 사이트 설정
 */
export const updateSiteSettingsPartial = async (input) => {
  const sql = getPostgresClient()

  if (!sql) {
    throw new Error('DATABASE_REQUIRED')
  }

  const hasOwn = (key) => Object.prototype.hasOwnProperty.call(input, key)
  const values = {}

  if (hasOwn('title')) values.title = input.title
  if (hasOwn('description')) values.description = input.description
  if (hasOwn('siteUrl')) values.site_url = input.siteUrl
  if (hasOwn('logoText')) values.logo_text = input.logoText || '井'
  if (hasOwn('logoUrl')) values.logo_url = input.logoUrl || ''
  if (hasOwn('faviconUrl')) values.favicon_url = input.faviconUrl || ''
  if (hasOwn('copyrightText')) values.copyright_text = input.copyrightText
  if (hasOwn('socialLinks')) values.social_links = sql.json(normalizeSocialLinks(input.socialLinks))
  if (hasOwn('showPostUpdatedAt')) values.show_post_updated_at = Boolean(input.showPostUpdatedAt)
  if (hasOwn('postTagLimit')) values.post_tag_limit = normalizePostTagLimit(input.postTagLimit)
  if (hasOwn('homeLatestPostLimit')) values.home_latest_post_limit = normalizeDisplayCount(input.homeLatestPostLimit, DEFAULT_HOME_LATEST_POST_LIMIT)
  if (hasOwn('postListPageSize')) values.post_list_page_size = normalizeDisplayCount(input.postListPageSize, DEFAULT_POST_LIST_PAGE_SIZE)
  if (hasOwn('tagPostListPageSize')) values.tag_post_list_page_size = normalizeDisplayCount(input.tagPostListPageSize, DEFAULT_TAG_POST_LIST_PAGE_SIZE)
  if (hasOwn('featuredPostLimit')) values.featured_post_limit = normalizeDisplayCount(input.featuredPostLimit, DEFAULT_FEATURED_POST_LIMIT)
  if (hasOwn('pageSectionItemLimit')) values.page_section_item_limit = normalizeDisplayCount(input.pageSectionItemLimit, DEFAULT_PAGE_SECTION_ITEM_LIMIT)
  if (hasOwn('uploadMaxFileCount')) values.upload_max_file_count = normalizeUploadMaxFileCount(input.uploadMaxFileCount)
  if (hasOwn('uploadMaxTotalSize')) values.upload_max_total_size = normalizeUploadMaxTotalSize(input.uploadMaxTotalSize)
  if (hasOwn('homeCoverImageUrl')) values.home_cover_image_url = input.homeCoverImageUrl || ''
  if (hasOwn('homeCoverDarkImageUrl')) values.home_cover_dark_image_url = input.homeCoverDarkImageUrl || ''
  if (hasOwn('homeCoverTitle')) values.home_cover_title = input.homeCoverTitle || ''
  if (hasOwn('homeCoverText')) values.home_cover_text = input.homeCoverText || ''
  if (hasOwn('brandColor')) values.brand_color = normalizeBrandColor(input.brandColor)
  if (hasOwn('announcementEnabled')) values.announcement_enabled = Boolean(input.announcementEnabled)
  if (hasOwn('announcementText')) values.announcement_text = input.announcementText || ''
  if (hasOwn('announcementUrl')) values.announcement_url = input.announcementUrl || ''
  if (hasOwn('announcementBackgroundColor')) values.announcement_background_color = normalizeAnnouncementBackgroundColor(input.announcementBackgroundColor)
  if (hasOwn('announcementAlignment')) values.announcement_alignment = normalizeAnnouncementAlignment(input.announcementAlignment)
  if (hasOwn('signupBlockedUsernames')) values.signup_blocked_usernames = JSON.stringify(normalizeSignupBlockedUsernames(input.signupBlockedUsernames))
  if (hasOwn('adsTxt')) values.ads_txt = input.adsTxt || ''
  if (hasOwn('customHeadCode')) values.custom_head_code = input.customHeadCode || ''
  if (hasOwn('customFooterCode')) values.custom_footer_code = input.customFooterCode || ''
  if (hasOwn('adHomeFeedCode')) values.ad_home_feed_code = input.adHomeFeedCode || ''
  if (hasOwn('adHomeInfeedCode')) values.ad_home_infeed_code = input.adHomeInfeedCode || ''
  if (hasOwn('adSidebarCode')) values.ad_sidebar_code = input.adSidebarCode || ''
  if (hasOwn('adPostSidebarCode')) values.ad_post_sidebar_code = input.adPostSidebarCode || ''
  if (hasOwn('adPostTopCode')) values.ad_post_top_code = input.adPostTopCode || ''
  if (hasOwn('adPostInArticleCode')) values.ad_post_in_article_code = input.adPostInArticleCode || ''
  if (hasOwn('adPostBottomCode')) values.ad_post_bottom_code = input.adPostBottomCode || ''

  if (!Object.keys(values).length) {
    return getSiteSettings()
  }

  const rows = await sql`
    UPDATE site_settings
    SET
      ${sql(values)},
      updated_at = now()
    WHERE id = 1
    RETURNING *
  `

  if (!rows[0]) {
    throw new Error('SITE_SETTINGS_NOT_FOUND')
  }

  const settings = mapSiteSettingsRow(rows[0])
  await syncSiteSettingsMediaReferences(settings)
  return settings
}

/**
 * 사이트 로고 URL을 수정한다.
 * @param {{ logoUrl: string, faviconUrl: string }} input - 로고 URL
 * @returns {Promise<Object>} 수정된 사이트 설정
 */
export const updateSiteLogo = async (input) => {
  const sql = getPostgresClient()

  if (!sql) {
    throw new Error('DATABASE_REQUIRED')
  }

  const rows = await sql`
    INSERT INTO site_settings (
      id,
      logo_url,
      favicon_url,
      updated_at
    )
    VALUES (
      1,
      ${input.logoUrl},
      ${input.faviconUrl},
      now()
    )
    ON CONFLICT (id) DO UPDATE
    SET
      logo_url = EXCLUDED.logo_url,
      favicon_url = EXCLUDED.favicon_url,
      updated_at = now()
    RETURNING *
  `

  const settings = mapSiteSettingsRow(rows[0])
  await syncSiteSettingsMediaReferences(settings)
  return settings
}

/**
 * 메인 화면 커버 이미지 URL을 수정한다.
 * @param {{ homeCoverImageUrl: string }} input - 커버 이미지 URL
 * @returns {Promise<Object>} 수정된 사이트 설정
 */
export const updateSiteHomeCoverImage = async (input) => {
  const sql = getPostgresClient()

  if (!sql) {
    throw new Error('DATABASE_REQUIRED')
  }

  const rows = await sql`
    INSERT INTO site_settings (
      id,
      home_cover_image_url,
      updated_at
    )
    VALUES (
      1,
      ${input.homeCoverImageUrl || ''},
      now()
    )
    ON CONFLICT (id) DO UPDATE
    SET
      home_cover_image_url = EXCLUDED.home_cover_image_url,
      updated_at = now()
    RETURNING *
  `

  const settings = mapSiteSettingsRow(rows[0])
  await syncSiteSettingsMediaReferences(settings)
  return settings
}

/**
 * 네비게이션 항목 목록 조회
 * @param {Object} options - 조회 옵션
 * @param {boolean} options.visibleOnly - 표시 항목만 조회할지 여부
 * @returns {Promise<Array>} 네비게이션 항목 목록
 */
export const listNavigationItems = async ({ visibleOnly = false } = {}) => {
  const sql = getPostgresClient()

  if (!sql) {
    return getDefaultNavigationItems()
      .filter((item) => !visibleOnly || item.isVisible)
  }

  const rows = visibleOnly
    ? await sql`
      SELECT *
      FROM navigation_items
      WHERE is_visible = true
      ORDER BY location ASC, sort_order ASC, label ASC
    `
    : await sql`
      SELECT *
      FROM navigation_items
      ORDER BY location ASC, sort_order ASC, label ASC
    `

  return rows.map(mapNavigationItemRow)
}

/**
 * 공개 네비게이션 조회
 * @returns {Promise<{primary: Array<Object>, footer: Array<Object>, recommended: Array<Object>}>} 위치별 공개 네비게이션
 */
export const getPublicNavigation = async () => {
  const flat = await listNavigationItems({ visibleOnly: true })
  const primaryFlat = flat.filter((item) => item.location === 'primary')
  const footerFlat = flat
    .filter((item) => item.location === 'footer' && !item.parentId)
    .sort((a, b) => (a.sortOrder || 0) - (b.sortOrder || 0))
  const recommendedFlat = flat
    .filter((item) => item.location === 'recommended' && !item.parentId)
    .sort((a, b) => (a.sortOrder || 0) - (b.sortOrder || 0))

  return {
    primary: buildPublicPrimaryTree(primaryFlat),
    footer: footerFlat.map((item) => ({
      id: item.id,
      label: item.label,
      url: item.url,
      isVisible: item.isVisible
    })),
    recommended: recommendedFlat.map((item) => ({
      id: item.id,
      label: item.label,
      url: item.url,
      descriptionText: item.descriptionText,
      thumbnailUrl: item.thumbnailUrl,
      cachedFaviconUrl: item.cachedFaviconUrl,
      isVisible: item.isVisible
    }))
  }
}

/**
 * 관리자 네비게이션 항목 일괄 저장
 * @param {Array<Object>} items - 저장할 네비게이션 항목 목록
 * @returns {Promise<Array>} 저장된 네비게이션 항목 목록
 */
export const updateNavigationItems = async (items) => {
  const sql = getPostgresClient()

  if (!sql) {
    throw new Error('DATABASE_REQUIRED')
  }

  const existingRows = await sql`
    SELECT id, cached_favicon_url, favicon_cached_at
    FROM navigation_items
  `
  const faviconCacheById = new Map(
    existingRows.map((row) => [
      String(row.id),
      {
        cachedFaviconUrl: row.cached_favicon_url || '',
        faviconCachedAt: row.favicon_cached_at ?? null
      }
    ])
  )

  await sql.begin(async (transaction) => {
    await transaction`
      DELETE FROM navigation_items
    `

    const ordered = orderNavigationItemsForInsert(items)
    for (const item of ordered) {
      const cached = faviconCacheById.get(String(item.id)) || {
        cachedFaviconUrl: '',
        faviconCachedAt: null
      }

      await transaction`
        INSERT INTO navigation_items (
          id,
          label,
          url,
          description_text,
          thumbnail_url,
          cached_favicon_url,
          favicon_cached_at,
          location,
          sort_order,
          is_visible,
          parent_id,
          is_folder
        )
        VALUES (
          ${item.id},
          ${item.label},
          ${item.url},
          ${item.descriptionText || ''},
          ${item.thumbnailUrl || ''},
          ${cached.cachedFaviconUrl},
          ${cached.faviconCachedAt},
          ${item.location},
          ${item.sortOrder},
          ${item.isVisible},
          ${item.parentId ?? null},
          ${Boolean(item.isFolder)}
        )
      `
    }
  })

  return listNavigationItems()
}

/**
 * 네비게이션 항목 단건 조회
 * @param {string} id - 항목 ID
 * @returns {Promise<Object | null>} 네비게이션 항목
 */
export const getNavigationItemById = async (id) => {
  const sql = getPostgresClient()

  if (!sql) {
    return null
  }

  const rows = await sql`
    SELECT *
    FROM navigation_items
    WHERE id = ${id}
    LIMIT 1
  `

  return rows[0] ? mapNavigationItemRow(rows[0]) : null
}

/**
 * 추천 사이트 파비콘 캐시를 갱신한다.
 * @param {string} id - 항목 ID
 * @param {string} cachedFaviconUrl - 저장된 파비콘 URL
 * @returns {Promise<Object | null>} 갱신된 항목
 */
export const updateNavigationItemFaviconCache = async (id, cachedFaviconUrl) => {
  const sql = getPostgresClient()

  if (!sql) {
    throw new Error('DATABASE_REQUIRED')
  }

  const rows = await sql`
    UPDATE navigation_items
    SET
      cached_favicon_url = ${cachedFaviconUrl},
      favicon_cached_at = NOW(),
      updated_at = NOW()
    WHERE id = ${id}
    RETURNING *
  `

  return rows[0] ? mapNavigationItemRow(rows[0]) : null
}

/**
 * 관리자 태그 상세 조회
 * @param {string} id - 태그 ID
 * @returns {Promise<Object | null>} 태그 상세
 */
export const getAdminTagById = async (id) => {
  const sql = getPostgresClient()

  if (!sql) {
    return getSampleTags().find((tag) => tag.id === id) || null
  }

  const rows = await sql`
    SELECT *
    FROM tags
    WHERE id = ${id}
    LIMIT 1
  `

  return rows[0] ? mapTagRow(rows[0]) : null
}

/**
 * 관리자 태그 생성
 * @param {Object} input - 태그 입력값
 * @returns {Promise<Object>} 생성된 태그
 */
export const createAdminTag = async (input) => {
  const sql = getPostgresClient()

  if (!sql) {
    throw new Error('DATABASE_REQUIRED')
  }

  const rows = await sql`
    INSERT INTO tags (name, slug, description, header_image_url, header_title, header_text, sort_order, color, tag_type)
    VALUES (${input.name}, ${input.slug}, ${input.description}, ${input.headerImageUrl}, ${input.headerTitle}, ${input.headerText}, ${input.sortOrder}, ${input.color}, ${input.tagType})
    RETURNING *
  `

  const tag = mapTagRow(rows[0])
  await syncTagMediaReferences(tag)
  return tag
}

/**
 * 관리자 태그 수정
 * @param {string} id - 태그 ID
 * @param {Object} input - 태그 입력값
 * @returns {Promise<Object | null>} 수정된 태그
 */
export const updateAdminTag = async (id, input) => {
  const sql = getPostgresClient()

  if (!sql) {
    throw new Error('DATABASE_REQUIRED')
  }

  const rows = await sql`
    UPDATE tags
    SET
      name = ${input.name},
      slug = ${input.slug},
      description = ${input.description},
      header_image_url = ${input.headerImageUrl},
      header_title = ${input.headerTitle},
      header_text = ${input.headerText},
      sort_order = ${input.sortOrder},
      color = ${input.color},
      tag_type = ${input.tagType},
      updated_at = now()
    WHERE id = ${id}
    RETURNING *
  `

  if (!rows[0]) {
    return null
  }

  const tag = mapTagRow(rows[0])
  await syncTagMediaReferences(tag)
  return tag
}

/**
 * 관리자 관리용 태그 순서를 일괄 갱신
 * @param {Array<string>} tagIds - 정렬된 태그 ID 목록
 * @returns {Promise<Array>} 갱신된 태그 목록
 */
export const reorderManagedTags = async (tagIds) => {
  const sql = getPostgresClient()

  if (!sql) {
    throw new Error('DATABASE_REQUIRED')
  }

  await sql.begin(async (transaction) => {
    for (let index = 0; index < tagIds.length; index += 1) {
      const tagId = tagIds[index]
      await transaction`
        UPDATE tags
        SET
          sort_order = ${(index + 1) * 10},
          updated_at = now()
        WHERE id = ${tagId}
          AND tag_type = 'managed'
      `
    }
  })

  return listTags({ tagType: 'managed' })
}

/**
 * 관리자 태그 삭제
 * @param {string} id - 태그 ID
 * @returns {Promise<boolean>} 삭제 여부
 */
export const deleteAdminTag = async (id) => {
  const sql = getPostgresClient()

  if (!sql) {
    throw new Error('DATABASE_REQUIRED')
  }

  const rows = await sql`
    DELETE FROM tags
    WHERE id = ${id}
    RETURNING id
  `

  return Boolean(rows[0])
}