// MCN工作台 - 数据访问层（只读复用 dsh 环境数据）
// 数据源：工作台目录 mcn-plugin.db（dsh 库副本，node:sqlite 只读）+ D:\dshworkspace\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');

// 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');
// 周榜目录：默认 dsh 工作区；可用环境变量 MCN_RANKING_DIR 覆盖
const RANKING_DIR = process.env.MCN_RANKING_DIR || 'D:\\dshworkspace\\抖音榜单';

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);
  }
}

/* ================= 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 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 = '' } = {}) {
  const d = getDb();
  if (!d) return { total: 0, page: 1, pageSize, items: [] };
  const where = [`v.id IN (SELECT id FROM (SELECT id, ROW_NUMBER() OVER (PARTITION BY account_id ORDER BY publish_time DESC, id DESC) rn FROM account_videos WHERE like_count >= 300000 AND comment_count >= 10000) t WHERE rn <= 10)`];
  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})`);
  }
  const w = '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,
      SUM(v.like_count) OVER (PARTITION BY v.account_id) AS acc_likes,
      (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 acc_likes 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写作评分 = 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
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
    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 ================= */

function rankingMeta() {
  const empty = { dates: [], categories: [] };
  if (!fs.existsSync(RANKING_DIR)) return empty;
  const files = fs.readdirSync(RANKING_DIR).filter((f) => /^抖音周榜_.+_\d{4}-\d{2}-\d{2}\.json$/.test(f)).sort().reverse();
  if (!files.length) return empty;
  const dates = [...new Set(files.map((f) => f.match(/_(\d{4}-\d{2}-\d{2})\.json$/)[1]))];
  const categories = [...new Set(files.map((f) => { const m = f.match(/^抖音周榜_(.+)_\d{4}-\d{2}-\d{2}\.json$/); return m ? m[1] : null; }).filter(Boolean))];
  return { dates, categories };
}

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({ date = '', category = '', sortBy = 'rank', order = '', page = 1, pageSize = 20 } = {}) {
  const empty = { dates: [], categories: [], category: '', date: '', total: 0, items: [] };
  if (!fs.existsSync(RANKING_DIR)) return empty;
  const files = fs.readdirSync(RANKING_DIR).filter((f) => /^抖音周榜_.+_\d{4}-\d{2}-\d{2}\.json$/.test(f)).sort().reverse();
  if (!files.length) return empty;
  const dates = [...new Set(files.map((f) => f.match(/_(\d{4}-\d{2}-\d{2})\.json$/)[1]))];
  const categories = [...new Set(files.map((f) => { const m = f.match(/^抖音周榜_(.+)_\d{4}-\d{2}-\d{2}\.json$/); return m ? m[1] : null; }).filter(Boolean))];
  const selDate = date || dates[0];
  const selFiles = files.filter((f) => f.includes(selDate) && (!category || f.includes('_' + category + '_')));
  let items = [];
  for (const f of selFiles) {
    try { items = items.concat(JSON.parse(fs.readFileSync(path.join(RANKING_DIR, f), 'utf8')).list || []); } catch (e) {}
  }
  // 默认排序：综合得分倒序，同分按排名升序（用户点表头排序时走下方 sortBy/order 逻辑）
  if (!order && (!sortBy || sortBy === 'rank')) {
    items.sort((a, b) => {
      const scA = num(a.comprehensiveScore), scB = num(b.comprehensiveScore);
      if (scA !== scB) return scB - scA;
      return num(a.rank) - num(b.rank);
    });
  } else {
    const orderDir = order === 'asc' ? 'asc' : (order === 'desc' ? 'desc' : (sortBy === 'rank' ? 'asc' : 'desc'));
    items.sort((a, b) => {
      const va = sortBy === 'rank' ? num(a.rank) : sortBy === 'comprehensiveScore' ? num(a.comprehensiveScore) : parseNum(a[sortBy]);
      const vb = sortBy === 'rank' ? num(b.rank) : sortBy === 'comprehensiveScore' ? num(b.comprehensiveScore) : parseNum(b[sortBy]);
      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) => {
    let hit = null;
    if (d) {
      const sec = secOf(row.profileUrl);
      hit = sec
        ? d.prepare(`SELECT id FROM hot_accounts WHERE sec_uid=? OR account_name=? LIMIT 1`).get(sec, row.accountName)
        : d.prepare(`SELECT id FROM hot_accounts WHERE account_name=? LIMIT 1`).get(row.accountName);
    }
    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 };
}

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