"""独立的 WebUI 服务器 - 运行在 0.0.0.0:8001"""

import os
import asyncio
import mimetypes
from pathlib import Path
from fastapi import FastAPI
from fastapi.responses import FileResponse
from uvicorn import Config, Server as UvicornServer
from src.common.logger import get_logger

logger = get_logger("webui_server")


class WebUIServer:
    """独立的 WebUI 服务器"""

    def __init__(self, host: str = "0.0.0.0", port: int = 8001):
        self.host = host
        self.port = port
        self.app = FastAPI(title="MaiBot WebUI")
        self._server = None
        
        # 显示 Access Token
        self._show_access_token()
        
        # 重要：先注册 API 路由，再设置静态文件
        self._register_api_routes()
        self._setup_static_files()

    def _show_access_token(self):
        """显示 WebUI Access Token"""
        try:
            from src.webui.token_manager import get_token_manager
            
            token_manager = get_token_manager()
            current_token = token_manager.get_token()
            logger.info(f"🔑 WebUI Access Token: {current_token}")
            logger.info("💡 请使用此 Token 登录 WebUI")
        except Exception as e:
            logger.error(f"❌ 获取 Access Token 失败: {e}")

    def _setup_static_files(self):
        """设置静态文件服务"""
        # 确保正确的 MIME 类型映射
        mimetypes.init()
        mimetypes.add_type("application/javascript", ".js")
        mimetypes.add_type("application/javascript", ".mjs")
        mimetypes.add_type("text/css", ".css")
        mimetypes.add_type("application/json", ".json")

        base_dir = Path(__file__).parent.parent.parent
        static_path = base_dir / "webui" / "dist"

        if not static_path.exists():
            logger.warning(f"❌ WebUI 静态文件目录不存在: {static_path}")
            logger.warning("💡 请先构建前端: cd webui && npm run build")
            return

        if not (static_path / "index.html").exists():
            logger.warning(f"❌ 未找到 index.html: {static_path / 'index.html'}")
            logger.warning("💡 请确认前端已正确构建")
            return

        # 处理 SPA 路由 - 注意：这个路由优先级最低
        @self.app.get("/{full_path:path}", include_in_schema=False)
        async def serve_spa(full_path: str):
            """服务单页应用 - 只处理非 API 请求"""
            # 如果是根路径，直接返回 index.html
            if not full_path or full_path == "/":
                return FileResponse(static_path / "index.html", media_type="text/html")
            
            # 检查是否是静态文件
            file_path = static_path / full_path
            if file_path.is_file() and file_path.exists():
                # 自动检测 MIME 类型
                media_type = mimetypes.guess_type(str(file_path))[0]
                return FileResponse(file_path, media_type=media_type)

            # 其他路径返回 index.html（SPA 路由）
            return FileResponse(static_path / "index.html", media_type="text/html")

        logger.info(f"✅ WebUI 静态文件服务已配置: {static_path}")

    def _register_api_routes(self):
        """注册所有 WebUI API 路由"""
        try:
            # 导入所有 WebUI 路由
            from src.webui.routes import router as webui_router
            from src.webui.logs_ws import router as logs_router
            
            logger.info("开始导入 knowledge_routes...")
            from src.webui.knowledge_routes import router as knowledge_router
            logger.info("knowledge_routes 导入成功")

            # 注册路由
            self.app.include_router(webui_router)
            self.app.include_router(logs_router)
            self.app.include_router(knowledge_router)
            logger.info(f"knowledge_router 路由前缀: {knowledge_router.prefix}")

            logger.info("✅ WebUI API 路由已注册")
        except Exception as e:
            logger.error(f"❌ 注册 WebUI API 路由失败: {e}", exc_info=True)

    async def start(self):
        """启动服务器"""
        config = Config(
            app=self.app,
            host=self.host,
            port=self.port,
            log_config=None,
            access_log=False,
        )
        self._server = UvicornServer(config=config)

        logger.info("🌐 WebUI 服务器启动中...")
        logger.info(f"🌐 访问地址: http://{self.host}:{self.port}")

        try:
            await self._server.serve()
        except Exception as e:
            logger.error(f"❌ WebUI 服务器运行错误: {e}")
            raise

    async def shutdown(self):
        """关闭服务器"""
        if self._server:
            logger.info("正在关闭 WebUI 服务器...")
            self._server.should_exit = True
            try:
                await asyncio.wait_for(self._server.shutdown(), timeout=3.0)
                logger.info("✅ WebUI 服务器已关闭")
            except asyncio.TimeoutError:
                logger.warning("⚠️ WebUI 服务器关闭超时")
            except Exception as e:
                logger.error(f"❌ WebUI 服务器关闭失败: {e}")
            finally:
                self._server = None


# 全局 WebUI 服务器实例
_webui_server = None


def get_webui_server() -> WebUIServer:
    """获取全局 WebUI 服务器实例"""
    global _webui_server
    if _webui_server is None:
        # 从环境变量读取配置
        host = os.getenv("WEBUI_HOST", "0.0.0.0")
        port = int(os.getenv("WEBUI_PORT", "8001"))
        _webui_server = WebUIServer(host=host, port=port)
    return _webui_server