#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
数据库迁移脚本：为 referral_bindings 表添加新字段
用于支持新的分销逻辑（立即切换绑定、购买累加）
"""

import os
import sys
import pymysql
from dotenv import load_dotenv

# 加载环境变量
load_dotenv()

# 数据库配置
DB_CONFIG = {
    'host': os.getenv('DB_HOST', 'localhost'),
    'port': int(os.getenv('DB_PORT', 3306)),
    'user': os.getenv('DB_USER', 'root'),
    'password': os.getenv('DB_PASSWORD', ''),
    'database': os.getenv('DB_NAME', 'mycontent_db'),
    'charset': 'utf8mb4'
}

def execute_sql(cursor, sql, description):
    """执行SQL并打印结果"""
    try:
        cursor.execute(sql)
        print(f"✅ {description}")
        return True
    except pymysql.err.OperationalError as e:
        if 'Duplicate' in str(e) or 'already exists' in str(e):
            print(f"⚠️  {description} (已存在，跳过)")
            return True
        else:
            print(f"❌ {description} 失败: {e}")
            return False
    except Exception as e:
        print(f"❌ {description} 失败: {e}")
        return False

def main():
    print("=" * 60)
    print("数据库迁移：referral_bindings 表字段升级")
    print("=" * 60)
    print()
    
    # 连接数据库
    try:
        conn = pymysql.connect(**DB_CONFIG)
        cursor = conn.cursor()
        print(f"✅ 已连接到数据库: {DB_CONFIG['database']}")
        print()
    except Exception as e:
        print(f"❌ 数据库连接失败: {e}")
        sys.exit(1)
    
    # 1. 添加新字段
    print("步骤 1: 添加新字段")
    print("-" * 60)
    
    execute_sql(
        cursor,
        """ALTER TABLE referral_bindings 
           ADD COLUMN last_purchase_date DATETIME NULL COMMENT '最后一次购买时间'""",
        "添加字段 last_purchase_date"
    )
    
    execute_sql(
        cursor,
        """ALTER TABLE referral_bindings 
           ADD COLUMN purchase_count INT DEFAULT 0 COMMENT '购买次数'""",
        "添加字段 purchase_count"
    )
    
    execute_sql(
        cursor,
        """ALTER TABLE referral_bindings 
           ADD COLUMN total_commission DECIMAL(10,2) DEFAULT 0.00 COMMENT '累计佣金'""",
        "添加字段 total_commission"
    )
    
    print()
    
    # 2. 添加索引
    print("步骤 2: 添加索引")
    print("-" * 60)
    
    execute_sql(
        cursor,
        """ALTER TABLE referral_bindings 
           ADD INDEX idx_referee_status (referee_id, status)""",
        "添加索引 idx_referee_status"
    )
    
    execute_sql(
        cursor,
        """ALTER TABLE referral_bindings 
           ADD INDEX idx_expiry_purchase (expiry_date, purchase_count, status)""",
        "添加索引 idx_expiry_purchase"
    )
    
    print()
    
    # 3. 修改 status 枚举
    print("步骤 3: 更新 status 枚举（添加 cancelled）")
    print("-" * 60)
    
    execute_sql(
        cursor,
        """ALTER TABLE referral_bindings 
           MODIFY COLUMN status ENUM('active', 'converted', 'expired', 'cancelled') 
           DEFAULT 'active' COMMENT '绑定状态'""",
        "更新 status 枚举类型"
    )
    
    print()
    
    # 提交更改
    conn.commit()
    
    # 4. 验证字段
    print("步骤 4: 验证迁移结果")
    print("-" * 60)
    
    cursor.execute("SHOW COLUMNS FROM referral_bindings")
    columns = cursor.fetchall()
    
    required_fields = ['last_purchase_date', 'purchase_count', 'total_commission']
    found_fields = [col[0] for col in columns]
    
    for field in required_fields:
        if field in found_fields:
            print(f"✅ 字段 {field} 已存在")
        else:
            print(f"❌ 字段 {field} 未找到")
    
    print()
    
    # 5. 显示索引
    print("步骤 5: 当前索引列表")
    print("-" * 60)
    
    cursor.execute("SHOW INDEX FROM referral_bindings")
    indexes = cursor.fetchall()
    
    for idx in indexes:
        print(f"  - {idx[2]} ({idx[4]})")
    
    print()
    
    # 关闭连接
    cursor.close()
    conn.close()
    
    print("=" * 60)
    print("✅ 迁移完成！")
    print("=" * 60)

if __name__ == "__main__":
    main()