import { getSamplePosts } from '../utils/sample-content.js'
import { getPostgresClient } from './postgres-client.js'

/**
 * 공개 블로그 누적 통계를 조회한다.
 * @returns {Promise<{
 *   totalVisitors: number,
 *   totalPageViews: number,
 *   totalPosts: number,
 *   totalComments: number,
 *   totalPages: number,
 *   totalTags: number,
 *   totalMembers: number
 * }>} 공개 블로그 누적 통계
 */
export const getPublicBlogStatistics = async () => {
  const sql = getPostgresClient()

  if (!sql) {
    return {
      totalVisitors: 0,
      totalPageViews: 0,
      totalPosts: getSamplePosts().filter((post) => post.status === 'published').length,
      totalComments: 0,
      totalPages: 0,
      totalTags: 0,
      totalMembers: 0
    }
  }

  const rows = await sql`
    SELECT
      (
        SELECT COALESCE(SUM(visitors), 0)::int
        FROM site_analytics_daily
      ) AS "totalVisitors",
      (
        SELECT COALESCE(SUM(page_views), 0)::int
        FROM site_analytics_daily
      ) AS "totalPageViews",
      (
        SELECT COUNT(*)::int
        FROM posts
        WHERE status = 'published'
          AND (published_at IS NULL OR published_at <= now())
      ) AS "totalPosts",
      (
        SELECT COUNT(*)::int
        FROM comments
        INNER JOIN posts ON posts.id = comments.post_id
        WHERE comments.status = 'published'
          AND posts.status = 'published'
          AND (posts.published_at IS NULL OR posts.published_at <= now())
      ) AS "totalComments",
      (
        SELECT COUNT(*)::int
        FROM pages
        WHERE status = 'published'
      ) AS "totalPages",
      (
        SELECT COUNT(*)::int
        FROM tags
      ) AS "totalTags",
      (
        SELECT COUNT(*)::int
        FROM users
      ) AS "totalMembers"
  `
  const row = rows[0] || {}

  return {
    totalVisitors: Number(row.totalVisitors || 0),
    totalPageViews: Number(row.totalPageViews || 0),
    totalPosts: Number(row.totalPosts || 0),
    totalComments: Number(row.totalComments || 0),
    totalPages: Number(row.totalPages || 0),
    totalTags: Number(row.totalTags || 0),
    totalMembers: Number(row.totalMembers || 0)
  }
}