/**
 * GroupChat 计数器回填脚本
 *
 * 用法: cd qiwe-common && npx tsx scripts/backfill-group-counters.ts
 *
 * 回填内容:
 * 1. messageCountTotal: 每个群的历史消息总数
 * 2. messageCountToday: 每个群的今日消息数
 * 3. memberCount: 每个群的活跃成员数
 * 4. lastActivityAt: 每个群的最后消息时间
 *
 * 执行时机: 上线计数器维护后，运行一次。
 * 幂等性: 可安全多次执行，只更新与现有值不同的记录。
 */
import 'dotenv/config';
import Parse from '../src/config/parse-client.js';

const GUID = process.env.QIWE_GUID || '';

async function backfillMessageCounts(): Promise<number> {
  console.log('\n═══ 1/4 messageCountTotal + messageCountToday 回填 ═══');

  // 获取所有群
  const gq = new Parse.Query('GroupChat');
  gq.exists('roomId');
  gq.limit(500);
  const groups = await gq.find({ useMasterKey: true });
  console.log(`共 ${groups.length} 个群`);

  // 预计算今日起始时间戳
  const today = new Date();
  today.setHours(0, 0, 0, 0);

  let updated = 0;
  for (const group of groups) {
    const roomId = group.get('roomId') as string;
    if (!roomId) continue;

    let changed = false;

    // 回填 messageCountTotal（所有消息）
    try {
      const mq = new Parse.Query('Message');
      mq.equalTo('roomId', roomId);
      mq.equalTo('guid', GUID);
      mq.containedIn('msgType', [0, 2]); // 仅文本 + 混合消息
      mq.exists('content');
      mq.notEqualTo('content', '');
      mq.limit(0); // 只取 count
      const totalCount = await mq.count({ useMasterKey: true });
      if (totalCount !== (group.get('messageCountTotal') ?? 0)) {
        group.set('messageCountTotal', totalCount);
        changed = true;
      }

      // 回填 messageCountToday（今日消息）
      const tmq = new Parse.Query('Message');
      tmq.equalTo('roomId', roomId);
      tmq.equalTo('guid', GUID);
      tmq.containedIn('msgType', [0, 2]);
      tmq.exists('content');
      tmq.notEqualTo('content', '');
      tmq.greaterThanOrEqualTo('timestamp', today);
      tmq.limit(0);
      const todayCount = await tmq.count({ useMasterKey: true });
      if (todayCount !== (group.get('messageCountToday') ?? 0)) {
        group.set('messageCountToday', todayCount);
        changed = true;
      }
    } catch (e: any) {
      console.warn(`roomId=${roomId} 消息计数查询失败: ${e.message}`);
    }

    if (changed) {
      await group.save(null, { useMasterKey: true });
      updated++;
    }
  }

  console.log(`messageCountTotal/messageCountToday 回填完成: ${updated} 个群已更新`);
  return updated;
}

async function backfillMemberCount(): Promise<number> {
  console.log('\n═══ 2/4 memberCount 回填 ═══');

  const gq = new Parse.Query('GroupChat');
  gq.exists('roomId');
  gq.limit(500);
  const groups = await gq.find({ useMasterKey: true });

  let updated = 0;
  for (const group of groups) {
    const roomId = group.get('roomId') as string;
    if (!roomId) continue;

    try {
      const mmq = new Parse.Query('GroupMember');
      mmq.equalTo('roomId', roomId);
      mmq.equalTo('guid', GUID);
      mmq.equalTo('status', 'active');
      mmq.limit(0);
      const memberCount = await mmq.count({ useMasterKey: true });
      if (memberCount !== (group.get('memberCount') ?? 0)) {
        group.set('memberCount', memberCount);
        await group.save(null, { useMasterKey: true });
        updated++;
      }
    } catch (e: any) {
      console.warn(`roomId=${roomId} memberCount 查询失败: ${e.message}`);
    }
  }

  console.log(`memberCount 回填完成: ${updated} 个群已更新`);
  return updated;
}

async function backfillLastActivityAt(): Promise<number> {
  console.log('\n═══ 3/4 lastActivityAt 回填 ═══');

  const gq = new Parse.Query('GroupChat');
  gq.exists('roomId');
  gq.limit(500);
  const groups = await gq.find({ useMasterKey: true });

  let updated = 0;
  for (const group of groups) {
    const roomId = group.get('roomId') as string;
    if (!roomId) continue;

    try {
      const mq = new Parse.Query('Message');
      mq.equalTo('roomId', roomId);
      mq.equalTo('guid', GUID);
      mq.containedIn('msgType', [0, 2]);
      mq.exists('content');
      mq.notEqualTo('content', '');
      mq.descending('timestamp');
      mq.limit(1);
      const latestMsg = await mq.first({ useMasterKey: true });
      if (latestMsg) {
        const ts = latestMsg.get('timestamp') as Date;
        group.set('lastActivityAt', ts);
        await group.save(null, { useMasterKey: true });
        updated++;
      }
    } catch (e: any) {
      console.warn(`roomId=${roomId} lastActivityAt 查询失败: ${e.message}`);
    }
  }

  console.log(`lastActivityAt 回填完成: ${updated} 个群已更新`);
  return updated;
}

async function verifyCounters(): Promise<void> {
  console.log('\n═══ 4/4 验证回填结果 ═══');

  const gq = new Parse.Query('GroupChat');
  gq.exists('roomId');
  gq.limit(500);
  const groups = await gq.find({ useMasterKey: true });

  let withTotal = 0;
  let withToday = 0;
  let withMember = 0;
  let withLastActivity = 0;
  let totalMessages = 0;
  let totalMembers = 0;

  for (const group of groups) {
    const tc = group.get('messageCountTotal') ?? 0;
    const td = group.get('messageCountToday') ?? 0;
    const mc = group.get('memberCount') ?? 0;
    const la = group.get('lastActivityAt');
    if (tc > 0) withTotal++;
    if (td > 0) withToday++;
    if (mc > 0) withMember++;
    if (la) withLastActivity++;
    totalMessages += tc;
    totalMembers += mc;
  }

  console.log(`总群数: ${groups.length}`);
  console.log(`有 messageCountTotal (>0): ${withTotal}/${groups.length}`);
  console.log(`有 messageCountToday (>0): ${withToday}/${groups.length}`);
  console.log(`有 memberCount (>0): ${withMember}/${groups.length}`);
  console.log(`有 lastActivityAt: ${withLastActivity}/${groups.length}`);
  console.log(`累计消息: ${totalMessages}`);
  console.log(`累计成员: ${totalMembers}`);
}

async function main(): Promise<void> {
  if (!GUID) {
    console.error('❌ QIWE_GUID 未配置，请在 .env 中设置');
    process.exit(1);
  }

  console.log('🔧 GroupChat 计数器回填');
  console.log(`GUID: ${GUID}`);
  console.log(`开始时间: ${new Date().toISOString()}`);

  const t0 = Date.now();

  await backfillMessageCounts();
  await backfillMemberCount();
  await backfillLastActivityAt();
  await verifyCounters();

  const elapsed = ((Date.now() - t0) / 1000).toFixed(1);
  console.log(`\n✅ 回填完成，耗时 ${elapsed}s`);
}

main().catch((err) => {
  console.error('❌ 回填失败:', err);
  process.exit(1);
});