#!/usr/bin/env python3
"""
数据库连接和迁移测试脚本
用于验证环境配置是否正确，以及迁移是否能够成功
"""

import sys
import psycopg2
from psycopg2 import sql, Error
from datetime import datetime

def print_header(text):
    """打印标题"""
    print("\n" + "=" * 80)
    print(f"【{text}】")
    print("=" * 80)

def test_db_connection(host, port, database, user, password):
    """测试数据库连接"""
    print_header("数据库连接测试")
    
    try:
        print(f"连接参数：")
        print(f"  主机: {host}")
        print(f"  端口: {port}")
        print(f"  数据库: {database}")
        print(f"  用户: {user}")
        
        conn = psycopg2.connect(
            host=host,
            port=port,
            database=database,
            user=user,
            password=password,
            connect_timeout=10
        )
        
        print("\n✓ 数据库连接成功！")
        cur = conn.cursor()
        
        # 获取服务器版本
        cur.execute("SELECT version();")
        version = cur.fetchone()[0]
        print(f"✓ PostgreSQL 版本: {version.split(',')[0]}")
        
        conn.close()
        return True
    except Error as e:
        print(f"\n❌ 连接失败: {e}")
        return False
    except Exception as e:
        print(f"\n❌ 未知错误: {e}")
        return False


def test_table_structure(host, port, database, user, password):
    """测试表结构和字段"""
    print_header("表结构检查")
    
    try:
        conn = psycopg2.connect(
            host=host,
            port=port,
            database=database,
            user=user,
            password=password
        )
        
        cur = conn.cursor()
        
        # 检查表是否存在
        cur.execute("""
            SELECT COUNT(*) FROM information_schema.tables 
            WHERE table_name = 'journal_entries'
        """)
        
        if cur.fetchone()[0] == 0:
            print("❌ 表 journal_entries 不存在！")
            print("请检查数据库架构是否已初始化。")
            conn.close()
            return False
        
        print("✓ 表 journal_entries 存在")
        
        # 检查新字段
        required_fields = [
            ('is_latest', 'BOOLEAN'),
            ('revision_count', 'INTEGER'),
            ('original_entry_id', 'INTEGER')
        ]
        
        for field_name, expected_type in required_fields:
            cur.execute("""
                SELECT data_type FROM information_schema.columns 
                WHERE table_name = 'journal_entries' AND column_name = %s
            """, (field_name,))
            
            row = cur.fetchone()
            if row:
                actual_type = row[0]
                print(f"✓ 字段 {field_name}: {actual_type}")
            else:
                print(f"⚠️  字段 {field_name} 不存在（将由迁移脚本创建）")
        
        conn.close()
        return True
    except Error as e:
        print(f"❌ 检查失败: {e}")
        return False


def test_migration(host, port, database, user, password):
    """运行迁移测试"""
    print_header("迁移测试（模拟运行）")
    
    try:
        from app.db_auto_migration import run_auto_migration
        
        print("执行自动迁移...")
        run_auto_migration()
        print("\n✓ 迁移测试完成！")
        return True
    except ImportError:
        print("⚠️  无法导入迁移模块（正常，应用启动时会运行）")
        return True
    except Exception as e:
        print(f"❌ 迁移失败: {e}")
        return False


def main():
    """主函数"""
    print("\n" + "=" * 80)
    print("【日记条目版本追踪系统 - 环境验证】")
    print("=" * 80)
    print(f"执行时间: {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}\n")
    
    # 数据库连接参数
    host = '192.168.0.61'
    port = 55432
    database = 'njts_acct'
    user = 'njts_app'
    password = 'njts_app2025'
    
    # 运行测试
    results = []
    
    # 1. 数据库连接
    results.append(("数据库连接", test_db_connection(host, port, database, user, password)))
    
    if results[-1][1]:  # 如果连接成功
        # 2. 表结构
        results.append(("表结构检查", test_table_structure(host, port, database, user, password)))
        
        # 3. 迁移测试
        results.append(("迁移测试", test_migration(host, port, database, user, password)))
    
    # 打印摘要
    print_header("检查摘要")
    
    for test_name, result in results:
        status = "✓ 通过" if result else "❌ 失败"
        print(f"{status} - {test_name}")
    
    # 最终结果
    print("\n" + "=" * 80)
    if all(r for _, r in results):
        print("✓ 所有检查通过！可以启动应用。")
        print("=" * 80 + "\n")
        return 0
    else:
        print("❌ 某些检查失败。请参考上面的错误信息。")
        print("=" * 80 + "\n")
        return 1


if __name__ == "__main__":
    sys.exit(main())