/**
 * 单页内容数据迁移脚本 - Node.js
 * 
 * 源表: MySQL danye
 * 目标表: SQL Server danye
 * 
 * 字段映射:
 * - id -> id
 * - title -> title
 * - content -> content
 * - update_time -> update_time
 * - status -> status
 * - is_image_optimizer -> is_image_optimizer
 */

const mysql = require('mysql2/promise');
const sql = require('mssql');

// MySQL 配置
const mysqlConfig = {
    host: '192.168.195.16',
    port: 1887,
    user: 'root',
    password: 'Dbt@com@123',
    database: 'youdas',
    charset: 'utf8mb4'
};

// SQL Server 配置
const sqlServerConfig = {
    server: '192.168.195.15',
    port: 1433,
    user: 'sa',
    password: 'Dbt@com@123',
    database: 'honey_box',
    options: {
        encrypt: false,
        trustServerCertificate: true
    }
};

// 转义SQL字符串
function escapeString(str) {
    if (str === null || str === undefined) return 'NULL';
    return "N'" + String(str).replace(/'/g, "''") + "'";
}

// 获取已迁移的ID列表
async function getMigratedIds(pool) {
    const result = await pool.request().query('SELECT id FROM danye');
    return new Set(result.recordset.map(r => r.id));
}

// 逐条插入数据（因为 content 字段可能很大）
async function insertDanyeOne(pool, danye) {
    const sqlStatement = `
SET IDENTITY_INSERT danye ON;
INSERT INTO danye (id, title, content, update_time, status, is_image_optimizer)
VALUES (${danye.id}, ${escapeString(danye.title)}, ${escapeString(danye.content)}, ${danye.update_time}, ${danye.status}, ${danye.is_image_optimizer});
SET IDENTITY_INSERT danye OFF;`;
    
    await pool.request().batch(sqlStatement);
}

async function main() {
    console.log('========================================');
    console.log('单页内容数据迁移脚本 - Node.js');
    console.log('========================================\n');
    
    let mysqlConn = null;
    let sqlPool = null;
    
    try {
        // 连接 MySQL
        console.log('正在连接 MySQL...');
        mysqlConn = await mysql.createConnection(mysqlConfig);
        console.log('MySQL 连接成功\n');
        
        // 连接 SQL Server
        console.log('正在连接 SQL Server...');
        sqlPool = await sql.connect(sqlServerConfig);
        console.log('SQL Server 连接成功\n');
        
        // 获取已迁移的ID
        console.log('正在获取已迁移的单页ID...');
        const migratedIds = await getMigratedIds(sqlPool);
        console.log(`已迁移单页数: ${migratedIds.size}\n`);
        
        // 从 MySQL 获取所有单页数据
        console.log('正在从 MySQL 读取单页数据...');
        const [rows] = await mysqlConn.execute(`
            SELECT id, title, content, update_time, status, is_image_optimizer
            FROM danye
            ORDER BY id
        `);
        console.log(`MySQL 单页总数: ${rows.length}\n`);
        
        // 显示单页列表
        console.log('单页列表:');
        for (const row of rows) {
            const status = migratedIds.has(row.id) ? '已迁移' : '待迁移';
            console.log(`  ${row.id}. ${row.title} [${status}]`);
        }
        console.log('');
        
        // 过滤出未迁移的单页
        const danyesToMigrate = rows.filter(danye => !migratedIds.has(danye.id));
        console.log(`待迁移单页数: ${danyesToMigrate.length}\n`);
        
        if (danyesToMigrate.length === 0) {
            console.log('所有单页数据已迁移完成！');
        } else {
            // 逐条迁移（因为 content 字段可能很大）
            console.log('开始迁移单页数据...');
            let insertedCount = 0;
            
            for (const danye of danyesToMigrate) {
                try {
                    await insertDanyeOne(sqlPool, danye);
                    insertedCount++;
                    console.log(`  ✓ 插入单页 ${danye.id}: ${danye.title}`);
                } catch (err) {
                    console.error(`  ✗ 插入单页 ${danye.id} (${danye.title}) 失败:`, err.message);
                }
            }
            
            console.log(`\n迁移完成！共插入 ${insertedCount} 条记录`);
        }
        
        // 验证迁移结果
        console.log('\n========================================');
        console.log('迁移结果验证');
        console.log('========================================');
        
        const [mysqlCount] = await mysqlConn.execute('SELECT COUNT(*) as count FROM danye');
        const sqlResult = await sqlPool.request().query('SELECT COUNT(*) as count FROM danye');
        
        console.log(`MySQL danye 表记录数: ${mysqlCount[0].count}`);
        console.log(`SQL Server danye 表记录数: ${sqlResult.recordset[0].count}`);
        
        if (mysqlCount[0].count === sqlResult.recordset[0].count) {
            console.log('\n✅ 数据迁移完成，记录数一致！');
        } else {
            console.log(`\n⚠️ 记录数不一致，差异: ${mysqlCount[0].count - sqlResult.recordset[0].count}`);
        }
        
        // 显示迁移后的单页列表
        console.log('\n迁移后的单页列表:');
        const migratedDanyes = await sqlPool.request().query('SELECT id, title FROM danye ORDER BY id');
        for (const danye of migratedDanyes.recordset) {
            console.log(`  ${danye.id}. ${danye.title}`);
        }
        
    } catch (err) {
        console.error('迁移过程中发生错误:', err);
        process.exit(1);
    } finally {
        // 关闭连接
        if (mysqlConn) await mysqlConn.end();
        if (sqlPool) await sqlPool.close();
    }
}

main();