"""
环境验证脚本 - 检查所有依赖和配置是否正确
"""
import sys
import os

def check_python_version():
    """检查 Python 版本"""
    print("=" * 50)
    print("检查 Python 版本...")
    print("=" * 50)
    version = sys.version_info
    print(f"Python 版本: {version.major}.{version.minor}.{version.micro}")

    if version.major == 3 and version.minor >= 11:
        print("✓ Python 版本符合要求 (3.11+)")
        return True
    else:
        print("✗ Python 版本过低，需要 3.11+")
        return False

def check_dependencies():
    """检查依赖包"""
    print("\n" + "=" * 50)
    print("检查依赖包...")
    print("=" * 50)

    packages = [
        ("fastapi", "FastAPI"),
        ("sqlalchemy", "SQLAlchemy"),
        ("langchain", "LangChain"),
        ("faiss", "FAISS"),
        ("pydantic", "Pydantic"),
        ("structlog", "Structlog"),
        ("alembic", "Alembic"),
        ("pymysql", "PyMySQL"),
    ]

    all_ok = True
    for module_name, display_name in packages:
        try:
            module = __import__(module_name)
            version = getattr(module, "__version__", "unknown")
            print(f"✓ {display_name}: {version}")
        except ImportError:
            print(f"✗ {display_name}: 未安装")
            all_ok = False

    return all_ok

def check_env_file():
    """检查环境变量文件"""
    print("\n" + "=" * 50)
    print("检查配置文件...")
    print("=" * 50)

    if os.path.exists(".env"):
        print("✓ .env 文件存在")

        # 尝试加载配置
        try:
            from dotenv import load_dotenv
            load_dotenv()

            # 检查关键配置
            required_vars = [
                "DATABASE_URL",
                "OPENAI_API_KEY",
            ]

            all_ok = True
            for var in required_vars:
                value = os.getenv(var)
                if value:
                    masked_value = value[:10] + "..." if len(value) > 10 else value
                    print(f"✓ {var}: {masked_value}")
                else:
                    print(f"✗ {var}: 未配置")
                    all_ok = False

            return all_ok
        except Exception as e:
            print(f"✗ 加载 .env 失败: {e}")
            return False
    else:
        print("✗ .env 文件不存在")
        print("  请从 .env.example 复制并配置")
        return False

def check_database_connection():
    """检查数据库连接"""
    print("\n" + "=" * 50)
    print("检查数据库连接...")
    print("=" * 50)

    try:
        sys.path.insert(0, "src")
        from app.config import get_settings
        from sqlalchemy import create_engine

        settings = get_settings()
        engine = create_engine(settings.database_url)

        # 尝试连接
        with engine.connect() as conn:
            result = conn.execute("SELECT 1").fetchone()
            if result:
                print(f"✓ 数据库连接成功")
                print(f"  URL: {settings.database_url.split('@')[1] if '@' in settings.database_url else 'localhost'}")
                return True
    except Exception as e:
        print(f"✗ 数据库连接失败: {e}")
        print("  请检查:")
        print("  1. MySQL 服务是否运行")
        print("  2. 数据库是否已创建")
        print("  3. DATABASE_URL 配置是否正确")
        return False

def check_project_structure():
    """检查项目结构"""
    print("\n" + "=" * 50)
    print("检查项目结构...")
    print("=" * 50)

    required_dirs = [
        "src/app",
        "src/app/db",
        "src/app/services",
        "src/app/api/v1",
        "src/app/utils",
        "data/faiss",
        "docs",
    ]

    required_files = [
        "src/app/config.py",
        "src/app/db/models.py",
        "src/app/db/session.py",
        "requirements.txt",
        "environment.yml",
    ]

    all_ok = True

    for dir_path in required_dirs:
        if os.path.isdir(dir_path):
            print(f"✓ {dir_path}/")
        else:
            print(f"✗ {dir_path}/ (不存在)")
            all_ok = False

    for file_path in required_files:
        if os.path.isfile(file_path):
            print(f"✓ {file_path}")
        else:
            print(f"✗ {file_path} (不存在)")
            all_ok = False

    return all_ok

def main():
    """主函数"""
    print("\n")
    print("╔" + "=" * 48 + "╗")
    print("║  LangChain Learning Kit - 环境验证工具      ║")
    print("╚" + "=" * 48 + "╝")
    print()

    checks = [
        ("Python 版本", check_python_version),
        ("依赖包", check_dependencies),
        ("配置文件", check_env_file),
        ("项目结构", check_project_structure),
        ("数据库连接", check_database_connection),
    ]

    results = {}
    for name, check_func in checks:
        try:
            results[name] = check_func()
        except Exception as e:
            print(f"\n✗ {name} 检查失败: {e}")
            results[name] = False

    # 总结
    print("\n" + "=" * 50)
    print("检查总结")
    print("=" * 50)

    passed = sum(1 for v in results.values() if v)
    total = len(results)

    for name, status in results.items():
        status_str = "✓ 通过" if status else "✗ 失败"
        print(f"{name}: {status_str}")

    print("\n" + "-" * 50)
    print(f"通过: {passed}/{total}")

    if passed == total:
        print("\n🎉 所有检查通过！环境配置完成。")
        print("\n下一步操作:")
        print("1. 初始化数据库: cd src && alembic upgrade head")
        print("2. 启动服务: cd src && uvicorn app.main:app --reload")
    else:
        print("\n⚠️  部分检查未通过，请根据上述提示修复问题。")
        print("\n常见问题解决:")
        print("- 依赖未安装: pip install -r requirements.txt")
        print("- .env 未配置: cp .env.example .env (然后编辑)")
        print("- 数据库未启动: 启动 MySQL 服务")
        print("- 数据库未创建: CREATE DATABASE langchain_learning;")

    print("\n" + "=" * 50)
    return 0 if passed == total else 1

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