// 檢查資料庫結構
require('dotenv').config({ path: '.env.local' })
const mysql = require('mysql2/promise')

async function checkDatabaseStructure() {
  const config = {
    host: process.env.DB_HOST,
    port: parseInt(process.env.DB_PORT),
    database: process.env.DB_DATABASE,
    user: process.env.DB_USERNAME,
    password: process.env.DB_PASSWORD,
  }

  try {
    const connection = await mysql.createConnection(config)
    console.log('🔗 連接到 MySQL 資料庫...')

    // 檢查所有表
    console.log('\n📋 檢查資料庫表結構...')
    const [tables] = await connection.execute(`
      SELECT table_name 
      FROM information_schema.tables 
      WHERE table_schema = ?
    `, [config.database])

    console.log(`\n📊 找到 ${tables.length} 個表:`)
    
    for (const table of tables) {
      const tableName = table.table_name
      console.log(`\n🔍 表: ${tableName}`)
      
      if (!tableName) {
        console.log('   ⚠️  表名為空，跳過')
        continue
      }
      
      // 檢查表結構
      const [columns] = await connection.execute(`
        SELECT column_name, data_type, is_nullable, column_default, column_key
        FROM information_schema.columns 
        WHERE table_schema = ? AND table_name = ?
        ORDER BY ordinal_position
      `, [config.database, tableName])
      
      console.log('  欄位:')
      columns.forEach(col => {
        const key = col.column_key ? ` (${col.column_key})` : ''
        const nullable = col.is_nullable === 'YES' ? 'NULL' : 'NOT NULL'
        console.log(`    - ${col.column_name}: ${col.data_type} ${nullable}${key}`)
      })
      
      // 檢查外鍵
      const [foreignKeys] = await connection.execute(`
        SELECT 
          constraint_name,
          column_name,
          referenced_table_name,
          referenced_column_name
        FROM information_schema.key_column_usage 
        WHERE table_schema = ? 
          AND table_name = ? 
          AND referenced_table_name IS NOT NULL
      `, [config.database, tableName])
      
      if (foreignKeys.length > 0) {
        console.log('  外鍵:')
        foreignKeys.forEach(fk => {
          console.log(`    - ${fk.constraint_name}: ${fk.column_name} -> ${fk.referenced_table_name}.${fk.referenced_column_name}`)
        })
      }
      
      // 檢查索引
      const [indexes] = await connection.execute(`
        SELECT index_name, column_name, non_unique
        FROM information_schema.statistics 
        WHERE table_schema = ? AND table_name = ?
        ORDER BY index_name, seq_in_index
      `, [config.database, tableName])
      
      if (indexes.length > 0) {
        console.log('  索引:')
        indexes.forEach(idx => {
          const unique = idx.non_unique === 0 ? 'UNIQUE' : ''
          console.log(`    - ${idx.index_name}: ${idx.column_name} ${unique}`)
        })
      }
    }

    await connection.end()
    console.log('\n✅ 資料庫結構檢查完成')

  } catch (error) {
    console.error('❌ 檢查資料庫結構失敗:', error)
  }
}

checkDatabaseStructure()