/**
 * 手动执行SQL迁移脚本
 * 用于Postgres-Only改造
 */

import { PrismaClient } from '@prisma/client';
import fs from 'fs';
import path from 'path';
import { fileURLToPath } from 'url';

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

const prisma = new PrismaClient();

async function runMigration() {
  try {
    console.log('🚀 开始执行手动迁移...\n');

    // 步骤1: 创建app_cache表
    console.log('📦 [1/4] 创建 app_cache 表...');
    try {
      await prisma.$executeRaw`
        CREATE TABLE IF NOT EXISTS platform_schema.app_cache (
          id         SERIAL PRIMARY KEY,
          key        VARCHAR(500) UNIQUE NOT NULL,
          value      JSONB NOT NULL,
          expires_at TIMESTAMP NOT NULL,
          created_at TIMESTAMP DEFAULT NOW()
        )
      `;
      console.log('   ✅ app_cache 表创建成功');
    } catch (error: any) {
      if (error.message.includes('already exists')) {
        console.log('   ⚠️  表已存在，跳过');
      } else {
        throw error;
      }
    }

    // 步骤2: 创建索引
    console.log('\n📊 [2/4] 创建索引...');
    try {
      await prisma.$executeRaw`
        CREATE INDEX IF NOT EXISTS idx_app_cache_expires 
        ON platform_schema.app_cache(expires_at)
      `;
      console.log('   ✅ idx_app_cache_expires 创建成功');
    } catch (error: any) {
      console.log('   ⚠️  索引可能已存在');
    }

    try {
      await prisma.$executeRaw`
        CREATE INDEX IF NOT EXISTS idx_app_cache_key_expires 
        ON platform_schema.app_cache(key, expires_at)
      `;
      console.log('   ✅ idx_app_cache_key_expires 创建成功');
    } catch (error: any) {
      console.log('   ⚠️  索引可能已存在');
    }

    // 步骤3: 添加任务拆分字段
    console.log('\n🔧 [3/4] 添加任务拆分字段...');
    const splitFields = [
      { name: 'total_batches', type: 'INTEGER', default: '1' },
      { name: 'processed_batches', type: 'INTEGER', default: '0' },
      { name: 'current_batch_index', type: 'INTEGER', default: '0' },
    ];

    for (const field of splitFields) {
      try {
        await prisma.$executeRawUnsafe(`
          ALTER TABLE asl_schema.screening_tasks 
          ADD COLUMN IF NOT EXISTS ${field.name} ${field.type} DEFAULT ${field.default}
        `);
        console.log(`   ✅ ${field.name} 添加成功`);
      } catch (error: any) {
        if (error.message.includes('already exists') || error.message.includes('duplicate')) {
          console.log(`   ⚠️  ${field.name} 已存在`);
        } else {
          throw error;
        }
      }
    }

    // 步骤4: 添加断点续传字段
    console.log('\n💾 [4/4] 添加断点续传字段...');
    const checkpointFields = [
      { name: 'current_index', type: 'INTEGER', default: '0' },
      { name: 'last_checkpoint', type: 'TIMESTAMP', default: null },
      { name: 'checkpoint_data', type: 'JSONB', default: null },
    ];

    for (const field of checkpointFields) {
      try {
        const defaultClause = field.default !== null ? `DEFAULT ${field.default}` : '';
        await prisma.$executeRawUnsafe(`
          ALTER TABLE asl_schema.screening_tasks 
          ADD COLUMN IF NOT EXISTS ${field.name} ${field.type} ${defaultClause}
        `);
        console.log(`   ✅ ${field.name} 添加成功`);
      } catch (error: any) {
        if (error.message.includes('already exists') || error.message.includes('duplicate')) {
          console.log(`   ⚠️  ${field.name} 已存在`);
        } else {
          throw error;
        }
      }
    }

    console.log('\n🎉 迁移执行完成！\n');

    // 验证结果
    console.log('📊 验证缓存表...');
    const cacheCheck = await prisma.$queryRaw`
      SELECT table_name, column_name, data_type
      FROM information_schema.columns
      WHERE table_schema = 'platform_schema' 
        AND table_name = 'app_cache'
      ORDER BY ordinal_position
    `;
    console.log('app_cache表字段:', cacheCheck);

    console.log('\n📊 验证任务表新字段...');
    const taskCheck = await prisma.$queryRaw`
      SELECT column_name, data_type, column_default
      FROM information_schema.columns
      WHERE table_schema = 'asl_schema' 
        AND table_name = 'screening_tasks'
        AND column_name IN (
          'total_batches', 'processed_batches', 'current_batch_index',
          'current_index', 'last_checkpoint', 'checkpoint_data'
        )
      ORDER BY ordinal_position
    `;
    console.log('screening_tasks新字段:', taskCheck);

    console.log('\n✅ 所有验证通过！');

  } catch (error) {
    console.error('❌ 迁移失败:', error);
    process.exit(1);
  } finally {
    await prisma.$disconnect();
  }
}

runMigration();