import { createError, readBody } from 'h3'
import { requireAdminSession } from '../../../utils/admin-auth'
import { parseAdminNavigationInput } from '../../../utils/admin-navigation-input'
import { updateNavigationItems } from '../../../repositories/content-repository'
import { renumberSortOrderByTree, validateNavigationItems } from '../../../utils/navigation-tree'

/**
 * 저장 직전에 항목별 표시·폴더 플래그를 정리한다(관리자 UI는 항상 노출, 폴더는 자식 유무로만).
 * @param {Array<Object>} items - 항목 목록(변경됨)
 * @returns {void}
 */
const applyNavigationDerivedFlags = (items) => {
  for (const item of items) {
    item.isVisible = true
    const id = String(item.id).trim()
    item.isFolder =
      item.location === 'primary' &&
      items.some(
        (o) =>
          o.location === 'primary' &&
          o.parentId != null &&
          String(o.parentId).trim() === id
      )
  }
}

/**
 * 관리자 네비게이션 일괄 저장 API
 * @param {import('h3').H3Event} event - 요청 이벤트
 * @returns {Promise<Array>} 저장된 네비게이션 항목 목록
 */
export default defineEventHandler(async (event) => {
  requireAdminSession(event)

  const parsedBody = parseAdminNavigationInput(await readBody(event))

  if (!parsedBody.success) {
    throw createError({
      statusCode: 400,
      message: '네비게이션 입력 형식이 올바르지 않습니다.'
    })
  }

  const items = parsedBody.data.items.map((row) => ({
    id: row.id,
    label: row.label.trim(),
    url: row.url.trim(),
    descriptionText: row.descriptionText.trim(),
    thumbnailUrl: row.thumbnailUrl.trim(),
    location: row.location,
    sortOrder: row.sortOrder,
    isVisible: true,
    parentId: row.parentId ?? null,
    isFolder: false
  }))

  const checked = validateNavigationItems(items)
  if (!checked.ok) {
    throw createError({
      statusCode: 400,
      message: checked.message
    })
  }

  renumberSortOrderByTree(items, 'primary')
  renumberSortOrderByTree(items, 'footer')
  renumberSortOrderByTree(items, 'recommended')
  applyNavigationDerivedFlags(items)

  try {
    return await updateNavigationItems(items)
  } catch (err) {
    const msg = err?.message != null ? String(err.message) : String(err)
    const code = err?.code != null ? String(err.code) : ''
    if (
      msg.includes('parent_id') ||
      msg.includes('is_folder') ||
      msg.includes('description_text') ||
      msg.includes('thumbnail_url') ||
      code === '42703'
    ) {
      throw createError({
        statusCode: 503,
        message: 'DB에 navigation_items 확장 컬럼이 없습니다. 프로젝트 루트에서 npm run db:migrate:dev 로 최신 마이그레이션을 적용한 뒤 다시 저장하세요.'
      })
    }
    throw err
  }
})