// 短视频工作台 - 数据访问层（只读复用业务数据目录）
// 数据源：工作台目录 mcn-plugin.db（dsh 库副本，node:sqlite 只读）+ 三方数据目录 抖音榜单/*.json
// 与 dsh 原库（~/.dsh/mcn-plugin.db）隔离：两边各访问各的，互不影响
// 页面逻辑参照 dsh-plugin-mcn 重新开发，仅复用数据库 schema 与榜单文件格式
'use strict';

const { DatabaseSync } = require('node:sqlite');
const path = require('node:path');
const fs = require('node:fs');
const os = require('node:os');

// 工作台自有数据库副本（与 dsh 原库隔离）
const DSH_DB = path.join(__dirname, 'mcn-plugin.db');

// 榜单目录解析（09-03 定稿：跟随 mcn-data-insight 榜单落盘规范的数据源分层）
// 优先级：① 环境变量 MCN_RANKING_DIR 显式覆盖 → ② dsh 部署（技能在 ~/.dsh 下）→ D:\dshworkspace\抖音榜单
//         → ③ 开发机/用户环境（①③）：桌面 MCNSkill项目\三方数据\红狐数据\抖音榜单（运行时解析真实桌面，兼容 OneDrive 重定向）
function resolveRankingDir() {
  if (process.env.MCN_RANKING_DIR) return process.env.MCN_RANKING_DIR;
  const isDshDeploy = __dirname.includes('.dsh');
  if (isDshDeploy) return 'D:\\dshworkspace\\抖音榜单';
  const home = os.homedir();
  const rel = path.join('MCNSkill项目', '三方数据', '红狐数据', '抖音榜单');
  const candidates = [
    path.join(home, 'Desktop', rel),
    path.join(home, 'OneDrive', 'Desktop', rel),
    path.join(home, 'OneDrive', '桌面', rel),
  ];
  return candidates.find((p) => fs.existsSync(p)) || candidates[0];
}
const RANKING_DIR = resolveRankingDir();

let _db = null;
let _dbTried = false;
function getDb() {
  if (_db) return _db;
  if (_dbTried) return null;
  _dbTried = true;
  try {
    if (!fs.existsSync(DSH_DB)) return null;
    _db = new DatabaseSync(DSH_DB, { readOnly: true });
  } catch (e) { _db = null; }
  return _db;
}
function dbAvailable() { return getDb() !== null; }

// 收藏切换：可写连接单独打开（与只读 getDb 隔离），操作完即关闭
function setFavorite(accountId, fav) {
  if (!fs.existsSync(DSH_DB)) throw new Error('数据库不可用');
  const w = new DatabaseSync(DSH_DB);
  try {
    const r = w.prepare(`UPDATE hot_accounts SET favorite=? WHERE id=?`).run(fav ? 1 : 0, Number(accountId));
    if (r.changes === 0) throw new Error('账号不存在');
  } finally {
    w.close();
  }
}

const num = (v) => { const n = Number(v); return Number.isFinite(n) ? n : 0; };
const fmt = (v) => (v == null || v === '') ? null : v;

// 批量删除：kind=accounts（软删账号+连坐清理）/ videos | rewrites（删视频行+关联）
// ids: 主键 id 数组；返回 { deleted: 实际删除条数 }
// 连坐范围：账号 → persona/analysis/videos（含 source/analysis/rewrite_log）；视频 → source/analysis/rewrite_log
// 注意 source/analysis 存在 video_id=null 的行（俊希等历史数据），须同时按 aweme_id 双键删
function batchDelete(kind, ids) {
  if (!fs.existsSync(DSH_DB)) throw new Error('数据库不可用');
  const clean = (Array.isArray(ids) ? ids : []).map(Number).filter((n) => Number.isFinite(n) && n > 0);
  if (clean.length === 0) return { deleted: 0 };
  const q = clean.map(() => '?').join(',');
  const w = new DatabaseSync(DSH_DB);
  try {
    if (kind === 'accounts') {
      w.prepare(`DELETE FROM account_persona WHERE account_id IN (${q})`).run(...clean);
      w.prepare(`DELETE FROM account_analysis WHERE account_id IN (${q})`).run(...clean);
      deleteVideosDeep(w, w.prepare(`SELECT id, aweme_id FROM account_videos WHERE account_id IN (${q})`).all(...clean));
      w.prepare(`DELETE FROM account_videos WHERE account_id IN (${q})`).run(...clean);
      w.prepare(`DELETE FROM rewrite_log WHERE account_id IN (${q})`).run(...clean);
      const r = w.prepare(`UPDATE hot_accounts SET del_flag=1 WHERE id IN (${q}) AND del_flag=0`).run(...clean);
      return { deleted: Number(r.changes) };
    }
    // videos | rewrites：删视频行 + 关联解析/脚本（按 video_id 与 aweme_id 双键）
    deleteVideosDeep(w, w.prepare(`SELECT id, aweme_id FROM account_videos WHERE id IN (${q})`).all(...clean));
    const r = w.prepare(`DELETE FROM account_videos WHERE id IN (${q})`).run(...clean);
    return { deleted: Number(r.changes) };
  } finally {
    w.close();
  }
}

function deleteVideosDeep(w, vids) {
  if (!vids.length) return;
  const ids = vids.map((v) => v.id);
  const awemes = vids.map((v) => v.aweme_id).filter(Boolean);
  const qi = ids.map(() => '?').join(',');
  w.prepare(`DELETE FROM account_video_source WHERE video_id IN (${qi})`).run(...ids);
  w.prepare(`DELETE FROM account_video_analysis WHERE video_id IN (${qi})`).run(...ids);
  w.prepare(`DELETE FROM rewrite_log WHERE video_id IN (${qi})`).run(...ids);
  if (awemes.length) {
    const qa = awemes.map(() => '?').join(',');
    w.prepare(`DELETE FROM account_video_source WHERE aweme_id IN (${qa})`).run(...awemes);
    w.prepare(`DELETE FROM account_video_analysis WHERE aweme_id IN (${qa})`).run(...awemes);
    w.prepare(`DELETE FROM rewrite_log WHERE aweme_id IN (${qa})`).run(...awemes);
  }
}

// 删除单条 AI 脚本（R58 弹窗「删除」）：连坐该脚本的诊断复盘（script_review ai/compare）与分镜提示词（storyboard_log）。
// 若删除后其视频下已无剩余脚本 → 视频级 source 复盘与该视频游离分镜（rewrite_id 空）一并清理，避免孤儿数据。
function deleteScript(rewriteId) {
  const id = Number(rewriteId);
  if (!(id > 0)) throw new Error('脚本 ID 无效');
  if (!fs.existsSync(DSH_DB)) throw new Error('数据库不可用');
  const w = new DatabaseSync(DSH_DB);
  try {
    const row = w.prepare(`SELECT id, video_id, aweme_id FROM rewrite_log WHERE id=?`).get(id);
    if (!row) return { deleted: 0 };
    w.prepare(`DELETE FROM script_review WHERE rewrite_id=?`).run(id); /* ai/compare 诊断 */
    w.prepare(`DELETE FROM storyboard_log WHERE rewrite_id=?`).run(id); /* 该脚本分镜 */
    if (row.video_id) {
      const remain = w.prepare(`SELECT COUNT(*) c FROM rewrite_log WHERE video_id=? AND id<>?`).get(row.video_id, id).c;
      if (remain === 0) {
        w.prepare(`DELETE FROM script_review WHERE type='source' AND video_id=?`).run(row.video_id);
        w.prepare(`DELETE FROM storyboard_log WHERE video_id=? AND (rewrite_id IS NULL OR rewrite_id=0)`).run(row.video_id);
      }
    }
    const r = w.prepare(`DELETE FROM rewrite_log WHERE id=?`).run(id);
    return { deleted: Number(r.changes) };
  } finally {
    w.close();
  }
}

/* ================= 账号 ================= */

function listTracks() {
  const d = getDb(); if (!d) return [];
  const rows = d.prepare(`SELECT DISTINCT track FROM hot_accounts WHERE track IS NOT NULL AND track != '' AND del_flag=0 ORDER BY track`).all();
  return rows.map((r) => r.track);
}

function listAccounts({ page = 1, pageSize = 20, search = '', track = '', type = 'all' } = {}) {
  const d = getDb();
  if (!d) return { total: 0, page: 1, pageSize, items: [] };
  const where = ['del_flag=0'];
  const params = [];
  if (search) {
    where.push('(account_name LIKE ? OR content LIKE ? OR track LIKE ?)');
    const like = `%${search}%`; params.push(like, like, like);
  }
  if (track) { where.push('track = ?'); params.push(track); }
  if (type === 'signed' || type === 'external') { where.push('account_type = ?'); params.push(type); }
  const whereSql = where.length ? 'WHERE ' + where.join(' AND ') : '';
  const total = d.prepare(`SELECT COUNT(*) c FROM hot_accounts ${whereSql}`).get(...params).c;
  const limit = Math.max(1, Math.min(Number(pageSize) || 20, 100));
  const offset = (Math.max(1, Number(page) || 1) - 1) * limit;
  const followersExpr = `CASE WHEN h.followers LIKE '%亿%' THEN CAST(REPLACE(REPLACE(h.followers,'亿',''),'万','') AS REAL) * 100000000 WHEN h.followers LIKE '%万%' THEN CAST(REPLACE(h.followers,'万','') AS REAL) * 10000 ELSE CAST(h.followers AS REAL) END`;
  const orderBySql = `h.favorite DESC, ${followersExpr} DESC, h.id ASC`;
  const items = d.prepare(`SELECT h.*, (SELECT COUNT(*) FROM account_videos v WHERE v.account_id = h.id) AS video_count,
      (SELECT COUNT(*) FROM rewrite_log r WHERE r.account_id = h.id AND r.status='done' AND r.script_text IS NOT NULL AND r.script_text <> '') AS rewrite_count
    FROM hot_accounts h ${whereSql} ORDER BY ${orderBySql} LIMIT ? OFFSET ?`).all(...params, limit, offset);
  return { total, page: Math.max(1, Number(page) || 1), pageSize: limit, items };
}

function listAccountVideos(accountId, page = 1, pageSize = 20) {
  const d = getDb(); if (!d) throw new Error('数据库不可用');
  const acc = d.prepare(`SELECT * FROM hot_accounts WHERE id=?`).get(accountId);
  if (!acc) throw new Error('账号不存在');
  const total = d.prepare(`SELECT COUNT(*) c FROM account_videos WHERE account_id=?`).get(accountId).c;
  const limit = Math.max(1, Math.min(Number(pageSize) || 20, 100));
  const offset = (Math.max(1, Number(page) || 1) - 1) * limit;
  const items = d.prepare(`
    SELECT v.*,
      (SELECT COUNT(*) FROM account_video_source s WHERE s.video_id=v.id OR s.aweme_id=v.aweme_id) AS has_source,
      (SELECT COUNT(*) FROM account_video_analysis a WHERE a.video_id=v.id OR a.aweme_id=v.aweme_id) AS has_analysis
    FROM account_videos v WHERE v.account_id=? ORDER BY v.publish_time IS NULL, v.publish_time DESC, v.id DESC LIMIT ? OFFSET ?
  `).all(accountId, limit, offset);
  return { account: acc, total, page: Math.max(1, Number(page) || 1), pageSize: limit, items };
}

function getPersona(accountId) {
  const d = getDb(); if (!d) return null;
  return d.prepare(`SELECT content_json AS content, analysis_time FROM account_persona WHERE account_id=? ORDER BY id DESC LIMIT 1`).get(accountId) || null;
}

function getAccountAnalysis(accountId) {
  const d = getDb(); if (!d) return null;
  return d.prepare(`SELECT content_json AS content, analysis_time FROM account_analysis WHERE account_id=? ORDER BY id DESC LIMIT 1`).get(accountId) || null;
}

/* ================= 视频 ================= */

function listVideos({ page = 1, pageSize = 20, search = '', parsed = '', days = '' } = {}) {
  const d = getDb();
  if (!d) return { total: 0, page: 1, pageSize, items: [] };
  // 09-01 用户要求：分页展示全部视频（不再限制每账号 30W+/1W+ 取 10 条）
  const where = [];
  const params = [];
  if (search) { where.push('(v.video_title LIKE ? OR h.account_name LIKE ?)'); params.push(`%${search}%`, `%${search}%`); }
  if (parsed === '1' || parsed === '0') {
    const cond = `(v.id IN (SELECT video_id FROM account_video_source) OR v.id IN (SELECT video_id FROM account_video_analysis))`;
    where.push(parsed === '1' ? cond : `NOT (${cond})`);
  }
  // 发布时间筛选：days>0 时取近 N 天（默认近一个月由前端传 30；localtime 避免 UTC 边界差一天）
  const n = Number(days);
  if (n > 0) { where.push(`v.publish_time >= date('now', 'localtime', ?)`); params.push(`-${n} days`); }
  const w = where.length ? 'WHERE ' + where.join(' AND ') : '';
  const total = d.prepare(`SELECT COUNT(*) c FROM account_videos v LEFT JOIN hot_accounts h ON h.id=v.account_id ${w}`).get(...params).c;
  const limit = Math.max(1, Math.min(Number(pageSize) || 20, 100));
  const offset = (Math.max(1, Number(page) || 1) - 1) * limit;
  const items = d.prepare(`
    SELECT v.*, h.account_name,
      (SELECT COUNT(*) FROM account_video_source s WHERE s.video_id=v.id OR s.aweme_id=v.aweme_id) AS has_source,
      (SELECT COUNT(*) FROM account_video_analysis a WHERE a.video_id=v.id OR a.aweme_id=v.aweme_id) AS has_analysis,
      (SELECT COUNT(*) FROM rewrite_log r WHERE r.video_id=v.id AND r.status='done' AND r.script_text IS NOT NULL AND r.script_text <> '') AS rewrite_count
    FROM account_videos v LEFT JOIN hot_accounts h ON h.id=v.account_id
    ${w} ORDER BY h.favorite DESC, v.publish_time DESC, v.id DESC LIMIT ? OFFSET ?
  `).all(...params, limit, offset);
  return { total, page: Math.max(1, Number(page) || 1), pageSize: limit, items };
}

function getVideoDetail({ videoId, awemeId }) {
  const d = getDb(); if (!d) throw new Error('数据库不可用');
  let video = null;
  if (videoId) {
    video = d.prepare(`SELECT v.*, h.account_name FROM account_videos v LEFT JOIN hot_accounts h ON h.id=v.account_id WHERE v.id=?`).get(videoId);
  } else if (awemeId) {
    video = d.prepare(`SELECT v.*, h.account_name FROM account_videos v LEFT JOIN hot_accounts h ON h.id=v.account_id WHERE v.aweme_id=?`).get(String(awemeId));
  }
  if (!video) throw new Error('视频不存在');
  const analysis = d.prepare(`SELECT content_json AS content, summary, analysis_time FROM account_video_analysis WHERE aweme_id=? OR video_id=? ORDER BY id DESC LIMIT 1`).get(String(video.aweme_id), video.id) || null;
  // MCP 解析内容：account_video_source.content_json（content.json 全文）+ analysis_json（analysis.json 全文）
  let parse = { found: false, content: null, analysis: null };
  const src = d.prepare(`SELECT content_json, analysis_json FROM account_video_source WHERE video_id=? OR (aweme_id IS NOT NULL AND aweme_id=?) ORDER BY id DESC LIMIT 1`).get(video.id, String(video.aweme_id));
  if (src && src.content_json) {
    try {
      const jd = JSON.parse(src.content_json);
      parse.content = typeof jd.content === 'string' ? jd.content : null;
      parse.found = true;
      if (src.analysis_json) {
        try { parse.analysis = JSON.parse(src.analysis_json); } catch (e) {}
      }
    } catch (e) { parse.content = src.content_json; parse.found = true; }
  }
  return { video, analysis, parse };
}

function getVideoScript(videoId) {
  const d = getDb(); if (!d) throw new Error('数据库不可用');
  let source = null;
  const src = d.prepare(`SELECT content_json FROM account_video_source WHERE video_id=? OR aweme_id=(SELECT aweme_id FROM account_videos WHERE id=?) ORDER BY id DESC LIMIT 1`).get(videoId, videoId);
  if (src && src.content_json) {
    try {
      const j = JSON.parse(src.content_json);
      const c = String(j.content || j.script || src.content_json);
      const idx = c.indexOf('# 视频脚本');
      source = idx >= 0 ? c.slice(idx) : c;
    } catch (e) { source = src.content_json; }
  }
  const rewrites = d.prepare(`SELECT id, script_text, created_time FROM rewrite_log WHERE video_id=? AND script_text IS NOT NULL AND script_text <> '' ORDER BY id DESC`).all(videoId);
  return { source, rewrites };
}

/* ================= 改写 / 分镜 / 复盘 ================= */

function listRewrites(videoId) {
  const d = getDb(); if (!d) return { items: [] };
  const rows = videoId > 0
    ? d.prepare(`SELECT id, video_id, status, title, created_time, updated_time, length(script_text) AS script_len FROM rewrite_log WHERE video_id=? ORDER BY id DESC`).all(videoId)
    : d.prepare(`SELECT id, video_id, status, title, created_time, updated_time, length(script_text) AS script_len FROM rewrite_log ORDER BY id DESC LIMIT 200`).all();
  const revCols = `id, type, rewrite_id, video_id, dims_json, total, verdict, status, created_time, updated_time`;
  const aiRev = new Map(), cmpRev = new Map(), srcRev = new Map();
  const ids = rows.map((r) => r.id);
  const vidIds = [...new Set(rows.map((r) => r.video_id).filter((v) => v > 0))];
  if (ids.length) {
    for (const rv of d.prepare(`SELECT ${revCols} FROM script_review WHERE type IN ('ai','compare') AND rewrite_id IN (${ids.map(() => '?').join(',')}) ORDER BY id DESC`).all(...ids)) {
      if (rv.type === 'ai') { if (!aiRev.has(rv.rewrite_id)) aiRev.set(rv.rewrite_id, rv); }
      else if (!cmpRev.has(rv.rewrite_id)) cmpRev.set(rv.rewrite_id, rv);
    }
  }
  if (vidIds.length) {
    for (const rv of d.prepare(`SELECT ${revCols} FROM script_review WHERE type='source' AND video_id IN (${vidIds.map(() => '?').join(',')}) ORDER BY id DESC`).all(...vidIds)) {
      if (!srcRev.has(rv.video_id)) srcRev.set(rv.video_id, rv);
    }
  }
  const runningKeys = new Set();
  for (const rr of d.prepare(`SELECT type, rewrite_id, video_id, status FROM script_review WHERE status='running'`).all()) {
    runningKeys.add(rr.type === 'source' ? 'source:' + rr.video_id : rr.type + ':' + rr.rewrite_id);
  }
  for (const it of rows) {
    it.review_ai = aiRev.get(it.id) || null;
    it.review_compare = cmpRev.get(it.id) || null;
    it.review_source = (it.video_id && srcRev.get(it.video_id)) || null;
    it.review_running = runningKeys.has('ai:' + it.id) || runningKeys.has('compare:' + it.id) || (it.video_id && runningKeys.has('source:' + it.video_id));
  }
  return { items: rows };
}

function listStoryboards(videoId) {
  const d = getDb(); if (!d) return [];
  return d.prepare(`SELECT id, video_id, rewrite_id, script_text, status, created_time, updated_time FROM storyboard_log WHERE video_id=? ORDER BY id DESC`).all(videoId);
}

function getReviewDetail(id) {
  const d = getDb(); if (!d) return null;
  return d.prepare(`SELECT * FROM script_review WHERE id=?`).get(id) || null;
}

function getReviewFull(rewriteId) {
  const d = getDb(); if (!d) return null;
  const rw = d.prepare(`SELECT video_id FROM rewrite_log WHERE id=?`).get(rewriteId);
  const videoId = rw ? rw.video_id : 0;
  const source = videoId ? d.prepare(`SELECT * FROM script_review WHERE type='source' AND video_id=? AND status='done' ORDER BY id DESC LIMIT 1`).get(videoId) : null;
  const ai = d.prepare(`SELECT * FROM script_review WHERE type='ai' AND rewrite_id=? AND status='done' ORDER BY id DESC LIMIT 1`).get(rewriteId);
  const compare = d.prepare(`SELECT * FROM script_review WHERE type='compare' AND rewrite_id=? AND status='done' ORDER BY id DESC LIMIT 1`).get(rewriteId);
  return { source: source || null, ai: ai || null, compare: compare || null };
}

function getStats() {
  const d = getDb(); if (!d) return null;
  const c = (sql) => d.prepare(sql).get().c;
  // AI写作复盘 = 已完成的 AI 脚本复盘数（script_review type='ai'）
  let reviews = 0;
  try { reviews = c(`SELECT COUNT(*) c FROM script_review WHERE type='ai' AND status='done'`); } catch (e) { /* 统计失败不影响其他 */ }
  // AI脚本评分 = 最新 20 条 AI 复盘总分的平均（保留 1 位小数；无评分返回 null）
  let writingScore = null;
  try {
    const rows = d.prepare(`SELECT total FROM script_review WHERE type='ai' AND status='done' AND total IS NOT NULL AND total <> '' ORDER BY updated_time DESC, id DESC LIMIT 20`).all();
    const nums = rows.map((r) => Number(r.total)).filter((v) => Number.isFinite(v));
    if (nums.length > 0) writingScore = Math.round((nums.reduce((s, v) => s + v, 0) / nums.length) * 10) / 10;
  } catch (e) { /* 评分统计失败不影响其他统计 */ }
  return {
    accounts: c(`SELECT COUNT(*) c FROM hot_accounts WHERE del_flag=0`),
    analyses: c(`SELECT COUNT(*) c FROM account_video_analysis`),
    rewrites: c(`SELECT COUNT(*) c FROM rewrite_log WHERE status='done' AND script_text IS NOT NULL AND script_text <> ''`),
    reviews,
    writingScore,
  };
}

// 最近 AI 写剧本（首页快捷卡片）：status=done 且有内容，按 id 倒序取前 N 条；
// score = 该脚本最新一条已完成 AI 复盘（script_review type='ai'）的总分，无复盘则为 null
function listRecentScripts(limit = 4) {
  const d = getDb(); if (!d) return [];
  const n = Math.max(1, Math.min(Number(limit) || 4, 20));
  return d.prepare(`
    SELECT r.id, r.title, r.script_text, r.created_time, r.video_id, r.account_id,
      h.account_name, v.video_title,
      (SELECT sr.total FROM script_review sr
        WHERE sr.type='ai' AND sr.rewrite_id = r.id AND sr.status='done'
          AND sr.total IS NOT NULL AND sr.total <> ''
        ORDER BY sr.id DESC LIMIT 1) AS score
    FROM rewrite_log r
    LEFT JOIN hot_accounts h ON h.id = r.account_id
    LEFT JOIN account_videos v ON v.id = r.video_id
    WHERE r.status='done' AND r.script_text IS NOT NULL AND r.script_text <> ''
    ORDER BY r.id DESC LIMIT ?
  `).all(n);
}

/* ================= 周榜（三榜族：week 账号周榜 / hot 视频热榜 / likes 点赞榜） ================= */

// ============ 榜单目录结构（09-03 分目录管理）============
// 抖音榜单/
//   账号周榜/抖音周榜_{赛道}_{周一}.json     → week（每赛道一期一文件，douyin-top-account 任务落盘）
//   视频热榜/抖音周榜_视频热榜_{周一}.json   → hot（全品类单文件，fetch_week_ranks.py 落盘，不传赛道一次调用）
//   点赞榜/ 抖音周榜_点赞榜_{周一}.json      → likes（全品类单文件，同上）
// 根目录旧平铺文件仍兼容读取（任务旧产物）。
// 全品类单文件（hot/likes）无赛道段：category 顶层标记「全部」，实际赛道在 list[].category，
// 赛道下拉 = 各期文件条目 category 并集，赛道筛选按条目 category 匹配。
const RANK_SUB = { week: '账号周榜', day: '账号日榜', hot: '视频热榜', likes: '点赞榜' };
const RANK_FILE_RE = {
  week: /^抖音周榜_(.+)_(\d{4}-\d{2}-\d{2})\.json$/,
  day: /^抖音账号日榜_(\d{4}-\d{2}-\d{2})\.json$/,
  hot: /^抖音周榜_视频热榜_(\d{4}-\d{2}-\d{2})\.json$/,
  likes: /^抖音周榜_点赞榜_(\d{4}-\d{2}-\d{2})\.json$/,
};

// 工作台所需赛道白名单（09-03 定：与账号周榜 douyin-top-account 保留 5 赛道同口径）
// 口径差异：账号榜 type=「生活vlog」；作品榜条目 category=「生活记录」——并集同时放行。
// 生效范围：day/hot/likes（全品类文件）赛道下拉与列表（含「全部」）只保留白名单条目；week 文件名赛道天然在白名单内。
const RANK_KEEP = ['生活记录', '生活vlog', '小剧场', '亲子', '美食', '旅行'];
const RANK_KEEP_SET = new Set(RANK_KEEP);

function rankFilePath(dir, name) {
  return dir ? path.join(RANKING_DIR, dir, name) : path.join(RANKING_DIR, name);
}

function parseRankFileIn(board, dir, name) {
  const m = String(name).match(RANK_FILE_RE[board]);
  if (!m) return null;
  if (board === 'week') return { board, dir, name, category: m[1], date: m[2] };
  return { board, dir, name, category: '全部', date: m[1] };
}

function listRankFiles(board) {
  if (!fs.existsSync(RANKING_DIR)) return [];
  const out = [];
  // ① 子目录（新结构，主路径）
  const subDir = path.join(RANKING_DIR, RANK_SUB[board]);
  if (fs.existsSync(subDir)) {
    for (const f of fs.readdirSync(subDir)) {
      const p = parseRankFileIn(board, RANK_SUB[board], f);
      if (p) out.push(p);
    }
  }
  // ② 根目录（旧平铺兼容）
  for (const f of fs.readdirSync(RANKING_DIR)) {
    const p = parseRankFileIn(board, '', f);
    if (p) out.push(p);
  }
  return out.sort((a, b) => b.date.localeCompare(a.date));
}

// 赛道下拉：白名单内且当期数据实际出现者，按 RANK_KEEP 顺序输出
// week：文件名赛道；hot/likes：条目 category 并集
function collectCategories(board, files) {
  const found = new Set();
  if (board === 'week') {
    for (const f of files) found.add(f.category);
  } else {
    for (const pf of files) {
      try {
        const d = JSON.parse(fs.readFileSync(rankFilePath(pf.dir, pf.name), 'utf8'));
        for (const it of (d.list || [])) { const c = String(it.category || '').trim(); if (c) found.add(c); }
      } catch (e) {}
    }
  }
  return RANK_KEEP.filter((c) => found.has(c));
}

function rankingMeta(board = 'week') {
  const empty = { dates: [], categories: [] };
  const files = listRankFiles(board);
  if (!files.length) return empty;
  const dates = [...new Set(files.map((f) => f.date))];
  return { dates, categories: collectCategories(board, files) };
}

// 榜单数据新鲜度（更新防重依据，09-03 新增）：递归扫描 RANKING_DIR（三榜子目录 + 根目录旧平铺）全部 .json，
// 返回最新落盘文件的 mtime（=最近一次成功抓取完成时刻，任务落盘即刷新）
function rankingFreshness() {
  const out = { exists: fs.existsSync(RANKING_DIR), latestMtime: 0, latestFile: '', latestDate: '', files: 0 };
  if (!out.exists) return out;
  const walk = (dir) => {
    let entries = [];
    try { entries = fs.readdirSync(dir, { withFileTypes: true }); } catch (e) { return; }
    for (const en of entries) {
      const full = path.join(dir, en.name);
      if (en.isDirectory()) walk(full);
      else if (/\.json$/i.test(en.name)) {
        out.files++;
        try {
          const st = fs.statSync(full);
          if (st.mtimeMs > out.latestMtime) { out.latestMtime = st.mtimeMs; out.latestFile = full; }
        } catch (e) {}
      }
    }
  };
  walk(RANKING_DIR);
  const m = String(out.latestFile).match(/(\d{4}-\d{2}-\d{2})\.json$/);
  if (m) out.latestDate = m[1];
  return out;
}

function parseNum(v) {
  const s = String(v ?? '');
  const m = s.match(/^([\d.]+)\s*(w|万)?$/i);
  if (!m) return 0;
  let n = parseFloat(m[1]);
  if (m[2]) n *= 10000;
  return n;
}

function getRanking({ board = 'week', date = '', category = '', sortBy = '', order = '', page = 1, pageSize = 20 } = {}) {
  const empty = { dates: [], categories: [], category: '', date: '', total: 0, items: [] };
  const files = listRankFiles(board);
  if (!files.length) return empty;
  const dates = [...new Set(files.map((f) => f.date))];
  const categories = collectCategories(board, files);
  const selDate = date || dates[0];
  // week：按文件名赛道过滤（每赛道一文件）；hot/likes 全品类单文件：赛道过滤在条目层
  const selFiles = files.filter((f) => f.date === selDate && (board !== 'week' || !category || f.category === category));
  let items = [];
  for (const pf of selFiles) {
    try { items = items.concat(JSON.parse(fs.readFileSync(rankFilePath(pf.dir, pf.name), 'utf8')).list || []); } catch (e) {}
  }
  // 全品类单文件（hot/likes）：①白名单过滤（含「全部」也只保留所需赛道条目）②按请求赛道条目过滤
  if (board !== 'week') {
    items = items.filter((it) => RANK_KEEP_SET.has(String(it.category || '').trim()));
    if (category && category !== '全部') {
      items = items.filter((it) => String(it.category || '').trim() === category);
    }
  }
  // 默认排序键随榜：week/day（账号榜）=综合得分 / hot=点赞 / likes=新增点赞（同分按排名升序）
  const DEF_KEY = (board === 'week' || board === 'day') ? 'comprehensiveScore' : board === 'hot' ? 'likeCount' : 'add_digg_count';
  if (!order && (!sortBy || sortBy === DEF_KEY)) {
    items.sort((a, b) => {
      const va = num(a[DEF_KEY]), vb = num(b[DEF_KEY]);
      if (va !== vb) return vb - va;
      return num(a.rank) - num(b.rank);
    });
  } else {
    const key = sortBy || DEF_KEY;
    const orderDir = order === 'asc' ? 'asc' : (order === 'desc' ? 'desc' : (key === 'rank' ? 'asc' : 'desc'));
    items.sort((a, b) => {
      const va = key === 'rank' ? num(a.rank) : parseNum(a[key]);
      const vb = key === 'rank' ? num(b.rank) : parseNum(b[key]);
      return orderDir === 'asc' ? va - vb : vb - va;
    });
  }
  const total = items.length;
  const limit = Math.max(1, Math.min(Number(pageSize) || 20, 100));
  const offset = (Math.max(1, Number(page) || 1) - 1) * limit;
  const d = getDb();
  const secOf = (url) => { const m = String(url || '').match(/\/user\/([^/?#]+)/); return m ? m[1] : ''; };
  const pageItems = items.slice(offset, offset + limit).map((row) => {
    // 账号维度（week，含 profileUrl）才做库内命中关联；作品维度不关联账号表
    const sec = row.profileUrl ? secOf(row.profileUrl) : '';
    let hit = null;
    if (d && sec) {
      hit = d.prepare(`SELECT id FROM hot_accounts WHERE sec_uid=? OR account_name=? LIMIT 1`).get(sec, row.accountName);
    } else if (d && row.accountName && !row.profileUrl && row.workUrl) {
      hit = null; // 作品榜条目不查账号表
    }
    return { ...row, inDb: !!hit, dbId: hit ? hit.id : null };
  });
  return { dates, categories, category, date: selDate, total, page: Math.max(1, Number(page) || 1), pageSize: limit, items: pageItems };
}

/* ================= AI写脚本：原创选题（无视频载体）================= */
/* 09-02 v25：账号列表「AI创作」（原创选题，无原视频）入库的脚本 = video_id 空。此处逐条列出该类脚本 */
function listCustomScripts({ page = 1, pageSize = 20, search = '', days = '', account = '' } = {}) {
  const d = getDb();
  if (!d) return { total: 0, page: 1, pageSize, items: [] };
  const where = [`(r.video_id IS NULL OR r.video_id = 0)`, `r.status='done'`, `r.script_text IS NOT NULL`, `r.script_text <> ''`];
  const params = [];
  if (search) { where.push('(r.title LIKE ? OR h.account_name LIKE ? OR r.topic LIKE ?)'); params.push(`%${search}%`, `%${search}%`, `%${search}%`); }
  if (account) { where.push('h.account_name = ?'); params.push(account); }
  const n = Number(days);
  if (n > 0) { where.push(`r.created_time >= date('now', 'localtime', ?)`); params.push(`-${n} days`); }
  const w = 'WHERE ' + where.join(' AND ');
  const total = d.prepare(`SELECT COUNT(*) c FROM rewrite_log r LEFT JOIN hot_accounts h ON h.id=r.account_id ${w}`).get(...params).c;
  const limit = Math.max(1, Math.min(Number(pageSize) || 20, 100));
  const offset = (Math.max(1, Number(page) || 1) - 1) * limit;
  const items = d.prepare(`
    SELECT r.id, r.video_id, r.account_id, r.title, r.topic, r.status, r.created_time, h.account_name,
      length(r.script_text) AS script_len
    FROM rewrite_log r LEFT JOIN hot_accounts h ON h.id=r.account_id
    ${w} ORDER BY r.id DESC LIMIT ? OFFSET ?`).all(...params, limit, offset);
  return { total, page: Math.max(1, Number(page) || 1), pageSize: limit, items };
}

/* 原创选题脚本全文（查看弹窗用，避免列表全量携带大文本） */
function getCustomScript(id) {
  const d = getDb(); if (!d) throw new Error('数据库不可用');
  const row = d.prepare(`SELECT r.id, r.video_id, r.account_id, r.title, r.topic, r.script_text, r.status, r.created_time, r.updated_time, h.account_name
    FROM rewrite_log r LEFT JOIN hot_accounts h ON h.id=r.account_id WHERE r.id=?`).get(Number(id));
  if (!row || row.video_id) throw new Error('脚本不存在或非原创选题脚本');
  return row;
}

/* 写库：AI创作任务完成后回调保存脚本（原创选题 videoId 省略/0 → video_id=NULL；参考选题传 videoId）
   可写连接单独打开（与只读 getDb 隔离），与 setFavorite 同模式 */
function saveScript({ videoId, awemeId, accountId, title, scriptText }) {
  if (!fs.existsSync(DSH_DB)) throw new Error('数据库不可用');
  const text = String(scriptText || '').trim();
  if (!text) throw new Error('脚本内容为空');
  const w = new DatabaseSync(DSH_DB);
  try {
    const vid = Number(videoId) > 0 ? Number(videoId) : null;
    const r = w.prepare(`INSERT INTO rewrite_log (video_id, aweme_id, account_id, script_text, title, status, created_time)
      VALUES (?, ?, ?, ?, ?, 'done', datetime('now','localtime'))`)
      .run(vid, awemeId ? String(awemeId) : null, Number(accountId) > 0 ? Number(accountId) : null, text, String(title || '').trim());
    return { id: Number(r.lastInsertRowid) };
  } finally {
    w.close();
  }
}

/* 09-02 v25：AI写脚本 三 tab 徽标计数——按 有原视频(参考选题)/无原视频(原创选题) 拆分；
   口径与账号列表「AI脚本」列一致（status=done 且脚本非空）；account 传账号名时按账号统计 */
function getRewriteStats(account = '') {
  const d = getDb();
  if (!d) return { videoScripts: 0, customScripts: 0 };
  const conds = [`r.status='done'`, `r.script_text IS NOT NULL`, `r.script_text <> ''`];
  const params = [];
  if (account) { conds.push('h.account_name = ?'); params.push(account); }
  const base = `FROM rewrite_log r LEFT JOIN hot_accounts h ON h.id=r.account_id WHERE ${conds.join(' AND ')}`;
  const videoScripts = d.prepare(`SELECT COUNT(*) c ${base} AND r.video_id > 0`).get(...params).c;
  const customScripts = d.prepare(`SELECT COUNT(*) c ${base} AND (r.video_id IS NULL OR r.video_id = 0)`).get(...params).c;
  return { videoScripts, customScripts };
}

module.exports = {
  dbAvailable, setFavorite, batchDelete, deleteScript, listTracks, listAccounts, listAccountVideos, getPersona, getAccountAnalysis,
  listVideos, getVideoDetail, getVideoScript, listRewrites, listStoryboards, listRecentScripts,
  getReviewDetail, getReviewFull, getStats, rankingMeta, getRanking, rankingFreshness, DSH_DB, RANKING_DIR,
  listCustomScripts, getCustomScript, saveScript, getRewriteStats,
};