/**
 * Phase 0: 风险通知体系 — 全表 Schema 迁移 + 数据迁移
 *
 * 用法: cd backend && npx tsx scripts/migrate-risk-notification-schema.ts
 *
 * 涉及表:
 * 1. ResponsibilityAssignment — 删 userId, 加 user(Pointer→_User)
 * 2. RiskEvent — 删 storeName/districtName, 加 escalation/confirmed/groupOwner 字段
 * 3. AppNotification — 加 riskEvent(Pointer→RiskEvent)
 * 4. GroupChat — 加 store(Pointer→Store), community(Pointer→Community), ownerPhone(String)
 */
import 'dotenv/config';
import Parse from '../src/db/parse-client.js';

async function testConnection(): Promise<void> {
  try {
    const n = await new Parse.Query('_User').count({ useMasterKey: true });
    console.log(`✅ Parse 连接正常 (_User: ${n} 条)\n`);
  } catch (err: any) {
    console.error(`❌ Parse 连接失败: ${err.message}`);
    process.exit(1);
  }
}

/* ═══════════════════════════════════════════════
   1. ResponsibilityAssignment
   ═══════════════════════════════════════════════ */
async function migrateResponsibilityAssignment(): Promise<void> {
  console.log('═══ 1/4 ResponsibilityAssignment ═══');

  const schema = new Parse.Schema('ResponsibilityAssignment');

  // 读现有数据
  const q = new Parse.Query('ResponsibilityAssignment');
  q.limit(5000);
  const records = await q.find({ useMasterKey: true }) as any[];
  console.log(`  现有记录: ${records.length} 条`);

  // userId → user Pointer 数据迁移
  let migrated = 0;
  let skipped = 0;
  const toSave: Parse.Object[] = [];

  for (const obj of records) {
    const userId = obj.get('userId') as string | undefined;
    let changed = false;

    if (userId) {
      try {
        const userQ = new Parse.Query('_User');
        const user = await userQ.get(userId, { useMasterKey: true });
        obj.set('user', user);
        migrated++;
        changed = true;
      } catch {
        console.log(`   ⚠ userId=${userId} 对应 _User 不存在，跳过`);
        skipped++;
      }
    }

    // 清除旧 userId 字段值
    if (obj.get('userId') != null) {
      obj.unset('userId');
      changed = true;
    }

    if (changed) toSave.push(obj);
  }

  if (toSave.length > 0) {
    await Parse.Object.saveAll(toSave, { useMasterKey: true });
  }
  console.log(`  数据: ${migrated} 条转 Pointer, ${skipped} 条跳过`);

  // Schema 更新
  try { await schema.get({ useMasterKey: true }); } catch { /* 不存在则创建 */ }
  try { await schema.deleteField('userId'); } catch { /* 已删除 */ }
  try { await schema.addField('user', 'Pointer', { targetClass: '_User' }); } catch { /* 已存在 */ }
  await schema.update({ useMasterKey: true });
  console.log('  Schema: userId 已删除, user(Pointer→_User) 已添加, userName/phone 保留\n');
}

/* ═══════════════════════════════════════════════
   2. RiskEvent
   ═══════════════════════════════════════════════ */
async function migrateRiskEvent(): Promise<void> {
  console.log('═══ 2/4 RiskEvent ═══');

  const schema = new Parse.Schema('RiskEvent');

  // 删除冗余 String 字段
  try { await schema.deleteField('storeName'); } catch { /* 不存在则跳过 */ }
  try { await schema.deleteField('districtName'); } catch { /* 不存在则跳过 */ }

  // 新增 escalation + confirmed + groupOwner 字段
  const newFields: Array<{ name: string; type: string; opts?: Record<string, any> }> = [
    { name: 'escalationLevel', type: 'Number' },
    { name: 'escalatedAt', type: 'Date' },
    { name: 'confirmedBy', type: 'Pointer', opts: { targetClass: '_User' } },
    { name: 'confirmedAt', type: 'Date' },
    { name: 'groupOwnerName', type: 'String' },
    { name: 'groupOwnerPhone', type: 'String' },
    { name: 'escalationNotifiedUserIds', type: 'Array' },
  ];

  for (const f of newFields) {
    try {
      if (f.opts) {
        await schema.addField(f.name, f.type, f.opts);
      } else {
        await schema.addField(f.name, f.type);
      }
      console.log(`  + ${f.name} (${f.type})`);
    } catch (err: any) {
      if (err.message?.includes('already')) {
        console.log(`  ~ ${f.name} 已存在`);
      } else {
        console.warn(`  ⚠ ${f.name} 添加失败: ${err.message}`);
      }
    }
  }

  await schema.update({ useMasterKey: true });
  console.log('  Schema 更新完成');

  // 已有 pending 事件补默认值
  const q = new Parse.Query('RiskEvent');
  q.equalTo('status', 'pending');
  q.limit(5000);
  const pendingEvents = await q.find({ useMasterKey: true }) as any[];
  console.log(`  待补全的 pending 事件: ${pendingEvents.length} 条`);

  if (pendingEvents.length > 0) {
    const toSave: Parse.Object[] = [];
    for (const ev of pendingEvents) {
      let changed = false;
      if (ev.get('escalationLevel') == null) {
        ev.set('escalationLevel', 1);
        changed = true;
      }
      if (ev.get('escalatedAt') == null) {
        ev.set('escalatedAt', ev.get('createdAt') || new Date());
        changed = true;
      }
      if (ev.get('escalationNotifiedUserIds') == null) {
        ev.set('escalationNotifiedUserIds', []);
        changed = true;
      }
      if (ev.get('confirmedBy') == null && ev.get('confirmedAt') == null) {
        // 保持 null，不需要额外设置
      }
      if (ev.get('groupOwnerName') == null) {
        ev.set('groupOwnerName', '');
        changed = true;
      }
      if (ev.get('groupOwnerPhone') == null) {
        ev.set('groupOwnerPhone', '');
        changed = true;
      }
      if (changed) toSave.push(ev);
    }
    if (toSave.length > 0) {
      await Parse.Object.saveAll(toSave, { useMasterKey: true });
      console.log(`  已补全 ${toSave.length} 条 pending 事件默认值`);
    }
  }
  console.log('');
}

/* ═══════════════════════════════════════════════
   3. AppNotification
   ═══════════════════════════════════════════════ */
async function migrateAppNotification(): Promise<void> {
  console.log('═══ 3/4 AppNotification ═══');

  const schema = new Parse.Schema('AppNotification');
  try { await schema.addField('riskEvent', 'Pointer', { targetClass: 'RiskEvent' }); } catch { /* 已存在 */ }
  await schema.update({ useMasterKey: true });
  console.log('  Schema: riskEvent(Pointer→RiskEvent) 已添加\n');
}

/* ═══════════════════════════════════════════════
   4. GroupChat
   ═══════════════════════════════════════════════ */
async function migrateGroupChat(): Promise<void> {
  console.log('═══ 4/4 GroupChat ═══');

  const schema = new Parse.Schema('GroupChat');

  const additions: Array<{ name: string; type: string; opts?: Record<string, any> }> = [
    { name: 'store', type: 'Pointer', opts: { targetClass: 'Store' } },
    { name: 'community', type: 'Pointer', opts: { targetClass: 'Community' } },
    { name: 'ownerPhone', type: 'String' },
  ];

  for (const add of additions) {
    try {
      if (add.opts) {
        await schema.addField(add.name, add.type, add.opts);
      } else {
        await schema.addField(add.name, add.type);
      }
      console.log(`  + ${add.name} (${add.type})`);
    } catch (err: any) {
      if (err.message?.includes('already')) {
        console.log(`  ~ ${add.name} 已存在`);
      } else {
        console.warn(`  ⚠ ${add.name} 添加失败: ${err.message}`);
      }
    }
  }

  await schema.update({ useMasterKey: true });
  console.log('  Schema 更新完成\n');
}

/* ═══════════════════════════════════════════════
   Main
   ═══════════════════════════════════════════════ */
async function main(): Promise<void> {
  console.log('=== 风险通知体系 Schema 迁移 ===');
  console.log(`Server: ${Parse.serverURL}`);
  console.log(`App ID: ${Parse.applicationId}\n`);

  await testConnection();

  await migrateResponsibilityAssignment();
  await migrateRiskEvent();
  await migrateAppNotification();
  await migrateGroupChat();

  console.log('=== 迁移完成 ===\n');
}

main().catch((err) => {
  console.error('迁移失败:', err.message);
  process.exit(1);
});