/**
 * 探查数据库表结构 + 数据量 + 示例数据
 *
 * 用法: cd backend && npx tsx scripts/discover-db.ts
 */
import 'dotenv/config';
import Parse from '../src/db/parse-client.js';

async function countRows(className: string): Promise<number> {
  try {
    const n = await new Parse.Query(className).count({ useMasterKey: true });
    return n;
  } catch {
    return -1;
  }
}

async function showSample(className: string, fields: string[], limit = 2): Promise<void> {
  try {
    const q = new Parse.Query(className);
    q.limit(limit);
    q.descending('updatedAt');
    const rows = await q.find({ useMasterKey: true }) as any[];
    if (rows.length === 0) {
      console.log('   (无数据)');
      return;
    }
    for (const row of rows) {
      const vals: string[] = [];
      for (const f of fields) {
        const v = row.get(f);
        if (v === undefined || v === null) {
          vals.push(`${f}=null`);
        } else if (typeof v === 'object' && v.className) {
          vals.push(`${f}=Pointer(${v.className}:${v.id})`);
        } else if (typeof v === 'object') {
          vals.push(`${f}=${JSON.stringify(v).substring(0, 80)}`);
        } else {
          const s = String(v);
          vals.push(`${f}=${s.length > 60 ? s.substring(0, 60) + '...' : s}`);
        }
      }
      console.log(`   ${vals.join(' | ')}`);
    }
  } catch (err: any) {
    console.log(`   查询失败: ${err.message}`);
  }
}

async function main(): Promise<void> {
  console.log('=== 数据库探查 ===\n');
  console.log(`Server: ${Parse.serverURL}`);
  console.log(`App ID: ${Parse.applicationId}\n`);

  // 测试连接
  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);
  }

  // 目标表
  const targets = ['GroupChat', 'GroupMember', 'Message', 'Community', 'Store', 'ResponsibilityAssignment'];
  const schemas = await Parse.Schema.all({ useMasterKey: true });
  const schemaMap = new Map(schemas.map(s => [s.className, s]));

  for (const className of targets) {
    const schema = schemaMap.get(className);
    const count = await countRows(className);
    console.log(`\n${'═'.repeat(80)}`);
    console.log(`📦 ${className}  —  ${count} 行`);
    console.log(`${'─'.repeat(80)}`);

    if (schema) {
      const fields = schema.fields as Record<string, { type: string; targetClass?: string }>;
      const entries = Object.entries(fields)
        .filter(([name]) => !name.startsWith('_'))
        .sort(([a], [b]) => a.localeCompare(b));

      const fieldNames: string[] = [];
      for (const [name, def] of entries) {
        const typeStr = def.type === 'Pointer' ? `Pointer→${def.targetClass || '?'}` : def.type;
        console.log(`   ${name}: ${typeStr}`);
        fieldNames.push(name);
      }

      // 示例数据
      console.log(`\n   示例数据:`);
      const keyFields = fieldNames.filter(f =>
        ['roomId', 'roomName', 'name', 'status', 'nickname', 'content', 'senderName',
         'msgType', 'lifecyclePhase', 'ownerName', 'scopeType', 'userName',
         'memberCount', 'messageCountToday', 'messageCountTotal', 'groupCount',
         'community', 'store', 'deliveryDate'].includes(f)
      );
      await showSample(className, keyFields.length > 0 ? keyFields : fieldNames.slice(0, 8));
    } else {
      console.log('   (Schema 未找到，可能表不存在)');
    }
  }

  // 检查 GroupChat 是否还有 memberCount/messageCountToday/messageCountTotal 字段
  console.log(`\n${'═'.repeat(80)}`);
  console.log('🔍 GroupChat 旧预计算字段检查');
  console.log(`${'─'.repeat(80)}`);
  const gcSchema = schemaMap.get('GroupChat');
  if (gcSchema) {
    const fields = gcSchema.fields as Record<string, { type: string }>;
    for (const name of ['memberCount', 'messageCountToday', 'messageCountTotal', 'ownerName', 'lastActivityAt', 'avatarUrl']) {
      console.log(`   ${name}: ${fields[name] ? '存在 (' + fields[name].type + ')' : '❌ 已删除'}`);
    }
  }

  // 今日消息量
  console.log(`\n${'═'.repeat(80)}`);
  console.log('🔍 今日消息量');
  console.log(`${'─'.repeat(80)}`);
  const todayStart = new Date();
  todayStart.setHours(0, 0, 0, 0);
  const todayMsgQ = new Parse.Query('Message');
  todayMsgQ.greaterThanOrEqualTo('timestamp', todayStart);
  todayMsgQ.containedIn('msgType', [0, 2]);
  todayMsgQ.notEqualTo('content', '');
  const todayMsgCount = await todayMsgQ.count({ useMasterKey: true });
  console.log(`   今日文本/富文本消息: ${todayMsgCount} 条`);

  console.log('\n完成!\n');
}

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