import { requireAdminSession } from '../../../../utils/admin-auth'
import { getBackupStorageSummary } from '../../../../utils/backup-storage-summary'
import { getPostgresClient } from '../../../../repositories/postgres-client'

/**
 * 빈 콘텐츠 집계를 만든다.
 * @returns {Object} 콘텐츠 집계
 */
const createEmptyContentSummary = () => ({
  posts: {
    total: 0,
    published: 0,
    draft: 0,
    private: 0,
    members: 0,
    scheduled: 0
  },
  pages: {
    total: 0,
    published: 0,
    draft: 0,
    private: 0,
    listed: 0,
    featured: 0
  },
  tags: {
    total: 0,
    managed: 0,
    general: 0,
    used: 0
  },
  comments: {
    total: 0,
    published: 0,
    pending: 0,
    blocked: 0
  },
  members: {
    total: 0,
    owner: 0,
    admin: 0,
    member: 0
  }
})

/**
 * 숫자 값을 안전하게 정수로 변환한다.
 * @param {unknown} value - 원본 값
 * @returns {number} 정수 값
 */
const toCount = (value) => Number(value || 0)

/**
 * 백업 점검용 콘텐츠 수량 집계를 조회한다.
 * @returns {Promise<Object>} 콘텐츠 수량 집계
 */
const getBackupContentSummary = async () => {
  const sql = getPostgresClient()

  if (!sql) {
    return createEmptyContentSummary()
  }

  const rows = await sql`
    SELECT
      (SELECT COUNT(*)::int FROM posts) AS "postsTotal",
      (SELECT COUNT(*)::int FROM posts WHERE status = 'published') AS "postsPublished",
      (SELECT COUNT(*)::int FROM posts WHERE status = 'draft') AS "postsDraft",
      (SELECT COUNT(*)::int FROM posts WHERE status = 'private') AS "postsPrivate",
      (SELECT COUNT(*)::int FROM posts WHERE status = 'members') AS "postsMembers",
      (SELECT COUNT(*)::int FROM posts WHERE status IN ('published', 'members') AND published_at > now()) AS "postsScheduled",
      (SELECT COUNT(*)::int FROM pages) AS "pagesTotal",
      (SELECT COUNT(*)::int FROM pages WHERE status = 'published') AS "pagesPublished",
      (SELECT COUNT(*)::int FROM pages WHERE status = 'draft') AS "pagesDraft",
      (SELECT COUNT(*)::int FROM pages WHERE status = 'private') AS "pagesPrivate",
      (SELECT COUNT(*)::int FROM pages WHERE is_listed = true) AS "pagesListed",
      (SELECT COUNT(*)::int FROM pages WHERE is_featured = true) AS "pagesFeatured",
      (SELECT COUNT(*)::int FROM tags) AS "tagsTotal",
      (SELECT COUNT(*)::int FROM tags WHERE tag_type = 'managed') AS "tagsManaged",
      (SELECT COUNT(*)::int FROM tags WHERE tag_type = 'general') AS "tagsGeneral",
      (SELECT COUNT(DISTINCT tag_id)::int FROM post_tags) AS "tagsUsed",
      (SELECT COUNT(*)::int FROM comments) AS "commentsTotal",
      (SELECT COUNT(*)::int FROM comments WHERE status = 'published') AS "commentsPublished",
      (SELECT COUNT(*)::int FROM comments WHERE status = 'pending') AS "commentsPending",
      (SELECT COUNT(*)::int FROM comments WHERE status = 'blocked') AS "commentsBlocked",
      (SELECT COUNT(*)::int FROM users) AS "membersTotal",
      (SELECT COUNT(*)::int FROM users WHERE user_role = 'owner') AS "membersOwner",
      (SELECT COUNT(*)::int FROM users WHERE user_role = 'admin') AS "membersAdmin",
      (SELECT COUNT(*)::int FROM users WHERE user_role = 'member') AS "membersMember"
  `
  const row = rows[0] || {}

  return {
    posts: {
      total: toCount(row.postsTotal),
      published: toCount(row.postsPublished),
      draft: toCount(row.postsDraft),
      private: toCount(row.postsPrivate),
      members: toCount(row.postsMembers),
      scheduled: toCount(row.postsScheduled)
    },
    pages: {
      total: toCount(row.pagesTotal),
      published: toCount(row.pagesPublished),
      draft: toCount(row.pagesDraft),
      private: toCount(row.pagesPrivate),
      listed: toCount(row.pagesListed),
      featured: toCount(row.pagesFeatured)
    },
    tags: {
      total: toCount(row.tagsTotal),
      managed: toCount(row.tagsManaged),
      general: toCount(row.tagsGeneral),
      used: toCount(row.tagsUsed)
    },
    comments: {
      total: toCount(row.commentsTotal),
      published: toCount(row.commentsPublished),
      pending: toCount(row.commentsPending),
      blocked: toCount(row.commentsBlocked)
    },
    members: {
      total: toCount(row.membersTotal),
      owner: toCount(row.membersOwner),
      admin: toCount(row.membersAdmin),
      member: toCount(row.membersMember)
    }
  }
}

/**
 * 관리자 사이트 용량 조회 API
 * @param {import('h3').H3Event} event - 요청 이벤트
 * @returns {Promise<Object>} 백업 점검용 현황
 */
export default defineEventHandler(async (event) => {
  requireAdminSession(event)

  const [content, storage] = await Promise.all([
    getBackupContentSummary(),
    getBackupStorageSummary()
  ])

  return {
    generatedAt: new Date().toISOString(),
    content,
    storage
  }
})