"""
应用启动器
"""
import sys
from pathlib import Path

from app.core.env_checker import check_environment
from app.core.venv_manager import check_virtualenv
from app.core.dependency_manager import check_dependencies


class AppLauncher:
    """应用启动器"""

    def __init__(self, project_root: Path):
        """
        初始化启动器
        
        Args:
            project_root: 项目根目录路径
        """
        self.project_root = project_root
        # 延迟导入logger
        from app.utils.logger import get_logger
        self.logger = get_logger()

    def run(self):
        """执行完整的启动流程"""
        try:
            # 检查系统和Python版本
            if not check_environment():
                sys.exit(1)

            # 检查虚拟环境
            check_virtualenv(self.project_root)

            # 检查是否正在使用虚拟环境运行
            import platform
            import sys
            venv_path = self.project_root / ".venv"
            os_name = platform.system()
            
            if os_name == 'Windows':
                venv_python = venv_path / "Scripts" / "python.exe"
            else:  # Linux/Mac
                venv_python = venv_path / "bin" / "python3"
            
            # 如果当前不是使用虚拟环境的Python，则重新启动
            current_python = Path(sys.executable).resolve()
            venv_python_resolved = venv_python.resolve()
            
            if current_python != venv_python_resolved:
                print("\n" + "=" * 50)
                print("检测到未使用虚拟环境，正在切换到虚拟环境...")
                print("=" * 50)
                
                # 使用虚拟环境的Python重新启动应用（不传递参数避免重复检查）
                import subprocess
                cmd = [str(venv_python)] + sys.argv
                subprocess.run(cmd, check=True)
                return

            # 以下代码仅在虚拟环境中执行
            # 检查安装依赖（只执行一次）
            check_dependencies(self.project_root)

            # 启动应用
            print("\n" + "=" * 50)
            print("✓ 所有检查通过，准备启动应用...")
            print("=" * 50)
            self.logger.info("系统环境检查通过，开始执行主程序...")
            start()

        except Exception as e:
            self.logger.error(f"启动失败: {e}")
            sys.exit(1)


def start():
    """启动应用服务"""
    import threading
    from config import settings
    from app.core.rainfall_manager import rainfall_manager
    from app.utils.logger import get_logger
    from app.utils.thread_pool_manager import block_main_thread, thread_pool_manager

    logger = get_logger()

    # 启动 FastAPI 服务（守护线程）
    def run_api_server():
        import uvicorn
        from app.core.server import create_app
        api_app = create_app()
        uvicorn.run(
            api_app,
            host=getattr(settings, "API_HOST", "127.0.0.1"),
            port=int(getattr(settings, "API_PORT", 8082)),
            log_level="info",
        )

    api_thread = threading.Thread(target=run_api_server, daemon=True, name="api-server")
    api_thread.start()
    logger.info(f"FastAPI 服务已启动: http://{getattr(settings, 'API_HOST', '127.0.0.1')}:{getattr(settings, 'API_PORT', 8082)}")

    # 启动降雨站点监测
    logger.info("启动降雨站点监测服务...")
    rainfall_manager.monitoring_rainfall_station_id('2025-09-16 20:00:00')

    # 阻塞主线程，防止程序立即退出
    block_main_thread()