import os
import aiofiles
from pathlib import Path

import yaml
from fastapi import APIRouter, Body, Depends, HTTPException

from src.storage.db.models import User
from server.utils.auth_middleware import get_admin_user
from src import config
from src.models.chat import test_chat_model_status, test_all_chat_models_status
from src.utils.logging_config import logger

system = APIRouter(prefix="/system", tags=["system"])

# =============================================================================
# === 健康检查分组 ===
# =============================================================================


@system.get("/health")
async def health_check():
    """系统健康检查接口（公开接口）"""
    return {"status": "ok", "message": "服务正常运行"}


# =============================================================================
# === 配置管理分组 ===
# =============================================================================


@system.get("/config")
async def get_config(current_user: User = Depends(get_admin_user)):
    """获取系统配置"""
    return config.dump_config()


@system.post("/config")
async def update_config_single(key=Body(...), value=Body(...), current_user: User = Depends(get_admin_user)) -> dict:
    """更新单个配置项"""
    config[key] = value
    config.save()
    return config.dump_config()


@system.post("/config/update")
async def update_config_batch(items: dict = Body(...), current_user: User = Depends(get_admin_user)) -> dict:
    """批量更新配置项"""
    config.update(items)
    config.save()
    return config.dump_config()


@system.get("/logs")
async def get_system_logs(levels: str | None = None, current_user: User = Depends(get_admin_user)):
    """获取系统日志

    Args:
        levels: 可选的日志级别过滤，多个级别用逗号分隔，如 "INFO,ERROR,DEBUG,WARNING"
    """
    try:
        from src.utils.logging_config import LOG_FILE

        # 解析日志级别过滤条件
        level_filter = None
        if levels:
            level_filter = set(level.strip().upper() for level in levels.split(",") if level.strip())

        async with aiofiles.open(LOG_FILE) as f:
            # 读取最后1000行
            lines = []
            async for line in f:
                filtered_line = line.rstrip("\n\r")
                # 如果指定了日志级别过滤，则按级别过滤
                if level_filter:
                    # 日志格式: 2025-03-10 08:26:37,269 - INFO - module - message
                    # 提取日志级别
                    parts = filtered_line.split(" - ")
                    if len(parts) >= 2 and parts[1].strip() in level_filter:
                        lines.append(filtered_line + "\n")
                    # 继续读取以保持行数统计准确
                    if len(lines) > 1000:
                        lines.pop(0)
                else:
                    lines.append(filtered_line + "\n")
                    if len(lines) > 1000:
                        lines.pop(0)

        log = "".join(lines)
        return {"log": log, "message": "success", "log_file": LOG_FILE}
    except Exception as e:
        logger.error(f"获取系统日志失败: {e}")
        raise HTTPException(status_code=500, detail=f"获取系统日志失败: {str(e)}")


# =============================================================================
# === 信息管理分组 ===
# =============================================================================


async def load_info_config():
    """加载信息配置文件"""
    try:
        # 配置文件路径
        brand_file_path = os.environ.get("YUXI_BRAND_FILE_PATH", "src/config/static/info.local.yaml")
        config_path = Path(brand_file_path)

        # 检查文件是否存在
        if not config_path.exists():
            logger.debug(f"The config file {config_path} does not exist, using default config")
            config_path = Path("src/config/static/info.template.yaml")

        # 异步读取配置文件
        async with aiofiles.open(config_path, encoding="utf-8") as file:
            content = await file.read()
            config = yaml.safe_load(content)

        return config

    except Exception as e:
        logger.error(f"Failed to load info config: {e}")
        return {}


@system.get("/info")
async def get_info_config():
    """获取系统信息配置（公开接口，无需认证）"""
    try:
        config = await load_info_config()
        return {"success": True, "data": config}
    except Exception as e:
        logger.error(f"获取信息配置失败: {e}")
        raise HTTPException(status_code=500, detail="获取信息配置失败")


@system.post("/info/reload")
async def reload_info_config(current_user: User = Depends(get_admin_user)):
    """重新加载信息配置"""
    try:
        config = await load_info_config()
        return {"success": True, "message": "配置重新加载成功", "data": config}
    except Exception as e:
        logger.error(f"重新加载信息配置失败: {e}")
        raise HTTPException(status_code=500, detail="重新加载信息配置失败")


# =============================================================================
# === OCR服务分组 ===
# =============================================================================


@system.get("/ocr/stats")
async def get_ocr_stats(current_user: User = Depends(get_admin_user)):
    """
    获取OCR服务使用统计信息
    返回各个OCR服务的处理统计和性能指标
    """
    try:
        from src.plugins._ocr import get_ocr_stats

        stats = get_ocr_stats()

        return {"status": "success", "stats": stats, "message": "OCR统计信息获取成功"}
    except Exception as e:
        logger.error(f"获取OCR统计信息失败: {str(e)}")
        return {"status": "error", "stats": {}, "message": f"获取OCR统计信息失败: {str(e)}"}


@system.get("/ocr/health")
async def check_ocr_services_health(current_user: User = Depends(get_admin_user)):
    """
    检查所有OCR服务的健康状态
    返回各个OCR服务的可用性信息
    """
    from src.plugins.document_processor_factory import DocumentProcessorFactory

    try:
        # 使用统一的健康检查接口
        health_status = DocumentProcessorFactory.check_all_health()

        # 转换为旧格式以保持API兼容性
        formatted_status = {}
        for service_name, health_info in health_status.items():
            formatted_status[service_name] = {
                "status": health_info.get("status", "unknown"),
                "message": health_info.get("message", ""),
                "details": health_info.get("details", {}),
            }

        # 计算整体健康状态
        overall_status = (
            "healthy" if any(svc["status"] == "healthy" for svc in formatted_status.values()) else "unhealthy"
        )

        return {
            "overall_status": overall_status,
            "services": formatted_status,
            "message": "OCR服务健康检查完成",
        }

    except Exception as e:
        logger.error(f"OCR健康检查失败: {str(e)}")
        return {
            "overall_status": "error",
            "services": {},
            "message": f"OCR健康检查失败: {str(e)}",
        }


# =============================================================================
# === 聊天模型状态检查分组 ===
# =============================================================================


@system.get("/chat-models/status")
async def get_chat_model_status(provider: str, model_name: str, current_user: User = Depends(get_admin_user)):
    """获取指定聊天模型的状态"""
    logger.debug(f"Checking chat model status: {provider}/{model_name}")
    try:
        status = await test_chat_model_status(provider, model_name)
        return {"status": status, "message": "success"}
    except Exception as e:
        logger.error(f"获取聊天模型状态失败 {provider}/{model_name}: {e}")
        return {
            "message": f"获取聊天模型状态失败: {e}",
            "status": {"provider": provider, "model_name": model_name, "status": "error", "message": str(e)},
        }


@system.get("/chat-models/all/status")
async def get_all_chat_models_status(current_user: User = Depends(get_admin_user)):
    """获取所有聊天模型的状态"""
    logger.debug("Checking all chat models status")
    try:
        status = await test_all_chat_models_status()
        return {"status": status, "message": "success"}
    except Exception as e:
        logger.error(f"获取所有聊天模型状态失败: {e}")
        return {"message": f"获取所有聊天模型状态失败: {e}", "status": {"models": {}, "total": 0, "available": 0}}


# =============================================================================
# === 自定义供应商管理分组 ===
# =============================================================================


@system.get("/custom-providers")
async def get_custom_providers(current_user: User = Depends(get_admin_user)):
    """获取所有自定义供应商"""
    try:
        custom_providers = config.get_custom_providers()
        return {
            "providers": {provider: info.model_dump() for provider, info in custom_providers.items()},
            "message": "success",
        }
    except Exception as e:
        logger.error(f"获取自定义供应商失败: {e}")
        raise HTTPException(status_code=500, detail=f"获取自定义供应商失败: {str(e)}")


@system.post("/custom-providers")
async def add_custom_provider(
    provider_id: str = Body(..., description="供应商ID"),
    provider_data: dict = Body(..., description="供应商配置数据"),
    current_user: User = Depends(get_admin_user),
):
    """添加自定义供应商"""
    try:
        success = config.add_custom_provider(provider_id, provider_data)
        if success:
            return {"message": f"自定义供应商 {provider_id} 添加成功"}
        else:
            raise HTTPException(status_code=400, detail=f"供应商ID {provider_id} 已存在，请使用其他ID")
    except Exception as e:
        logger.error(f"添加自定义供应商失败 {provider_id}: {e}")
        raise HTTPException(status_code=500, detail=f"添加自定义供应商失败: {str(e)}")


@system.put("/custom-providers/{provider_id}")
async def update_custom_provider(
    provider_id: str,
    provider_data: dict = Body(..., description="供应商配置数据"),
    current_user: User = Depends(get_admin_user),
):
    """更新自定义供应商"""
    try:
        success = config.update_custom_provider(provider_id, provider_data)
        if success:
            return {"message": f"自定义供应商 {provider_id} 更新成功"}
        else:
            raise HTTPException(status_code=404, detail=f"自定义供应商 {provider_id} 不存在或更新失败")
    except Exception as e:
        logger.error(f"更新自定义供应商失败 {provider_id}: {e}")
        raise HTTPException(status_code=500, detail=f"更新自定义供应商失败: {str(e)}")


@system.delete("/custom-providers/{provider_id}")
async def delete_custom_provider(provider_id: str, current_user: User = Depends(get_admin_user)):
    """删除自定义供应商"""
    try:
        success = config.delete_custom_provider(provider_id)
        if success:
            return {"message": f"自定义供应商 {provider_id} 删除成功"}
        else:
            raise HTTPException(status_code=404, detail=f"自定义供应商 {provider_id} 不存在或删除失败")
    except Exception as e:
        logger.error(f"删除自定义供应商失败 {provider_id}: {e}")
        raise HTTPException(status_code=500, detail=f"删除自定义供应商失败: {str(e)}")


@system.post("/custom-providers/{provider_id}/test")
async def test_custom_provider(
    provider_id: str, request: dict = Body(..., description="测试请求"), current_user: User = Depends(get_admin_user)
):
    """测试自定义供应商连接"""
    try:
        # 从请求中获取model_name
        model_name = request.get("model_name")
        if not model_name:
            raise HTTPException(status_code=400, detail="缺少model_name参数")

        # 检查供应商是否存在
        if provider_id not in config.model_names:
            raise HTTPException(status_code=404, detail=f"供应商 {provider_id} 不存在")

        # 测试模型状态
        status = await test_chat_model_status(provider_id, model_name)
        return {"status": status, "message": "测试完成"}
    except HTTPException:
        raise
    except Exception as e:
        logger.error(f"测试自定义供应商失败 {provider_id}/{model_name}: {e}")
        return {
            "message": f"测试自定义供应商失败: {e}",
            "status": {"provider": provider_id, "model_name": model_name, "status": "error", "message": str(e)},
        }