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 './display-count-settings.js'
import {
  DEFAULT_POST_TAG_LIMIT,
  normalizePostTagLimit
} from './post-tag-limit.js'
import {
  DEFAULT_UPLOAD_MAX_FILE_COUNT,
  DEFAULT_UPLOAD_MAX_TOTAL_SIZE,
  normalizeUploadMaxFileCount,
  normalizeUploadMaxTotalSize
} from './upload-size-limit.js'

export const POST_SETTINGS_FIELDS = [
  'showPostUpdatedAt',
  'postTagLimit',
  'homeLatestPostLimit',
  'postListPageSize',
  'tagPostListPageSize',
  'featuredPostLimit',
  'pageSectionItemLimit',
  'uploadMaxFileCount',
  'uploadMaxTotalSize'
]

/**
 * POST 설정 기본 스냅샷을 만든다.
 * @returns {Object} 기본 POST 설정 값
 */
export const createDefaultPostSettingsSnapshot = () => ({
  showPostUpdatedAt: false,
  postTagLimit: DEFAULT_POST_TAG_LIMIT,
  homeLatestPostLimit: DEFAULT_HOME_LATEST_POST_LIMIT,
  postListPageSize: DEFAULT_POST_LIST_PAGE_SIZE,
  tagPostListPageSize: DEFAULT_TAG_POST_LIST_PAGE_SIZE,
  featuredPostLimit: DEFAULT_FEATURED_POST_LIMIT,
  pageSectionItemLimit: DEFAULT_PAGE_SECTION_ITEM_LIMIT,
  uploadMaxFileCount: DEFAULT_UPLOAD_MAX_FILE_COUNT,
  uploadMaxTotalSize: DEFAULT_UPLOAD_MAX_TOTAL_SIZE
})

/**
 * POST 설정 값을 저장·비교 가능한 형태로 정규화한다.
 * @param {Object} source - 원본 설정 값
 * @returns {Object} 정규화된 POST 설정 값
 */
export const normalizePostSettingsSection = (source = {}) => ({
  showPostUpdatedAt: Boolean(source.showPostUpdatedAt),
  postTagLimit: normalizePostTagLimit(source.postTagLimit),
  homeLatestPostLimit: normalizeDisplayCount(source.homeLatestPostLimit, DEFAULT_HOME_LATEST_POST_LIMIT),
  postListPageSize: normalizeDisplayCount(source.postListPageSize, DEFAULT_POST_LIST_PAGE_SIZE),
  tagPostListPageSize: normalizeDisplayCount(source.tagPostListPageSize, DEFAULT_TAG_POST_LIST_PAGE_SIZE),
  featuredPostLimit: normalizeDisplayCount(source.featuredPostLimit, DEFAULT_FEATURED_POST_LIMIT),
  pageSectionItemLimit: normalizeDisplayCount(source.pageSectionItemLimit, DEFAULT_PAGE_SECTION_ITEM_LIMIT),
  uploadMaxFileCount: normalizeUploadMaxFileCount(source.uploadMaxFileCount),
  uploadMaxTotalSize: normalizeUploadMaxTotalSize(source.uploadMaxTotalSize)
})

/**
 * POST 설정 필드만 대상 객체에 복사한다.
 * @param {Object} target - 값을 받을 객체
 * @param {Object} source - 값을 제공할 객체
 * @returns {void}
 */
export const assignPostSettingsSection = (target, source = {}) => {
  const normalized = normalizePostSettingsSection(source)
  POST_SETTINGS_FIELDS.forEach((field) => {
    target[field] = normalized[field]
  })
}

/**
 * 두 POST 설정 값이 다른지 확인한다.
 * @param {Object} current - 현재 설정 값
 * @param {Object} snapshot - 비교할 스냅샷
 * @returns {boolean} 변경 여부
 */
export const hasPostSettingsSectionChanges = (current, snapshot) => {
  const normalizedCurrent = normalizePostSettingsSection(current)
  const normalizedSnapshot = normalizePostSettingsSection(snapshot)
  return POST_SETTINGS_FIELDS.some((field) => normalizedCurrent[field] !== normalizedSnapshot[field])
}