"""
文件服务路由 (图片、下载等)
"""

import logging
from pathlib import Path

from fastapi import APIRouter, HTTPException, status
from fastapi.responses import FileResponse

from app.core.config import settings

logger = logging.getLogger(__name__)
router = APIRouter()


@router.get("/image/{filename}", summary="获取图片文件")
async def serve_image(filename: str):
    """
    获取可视化图片文件
    """
    try:
        file_path = settings.get_upload_path(filename)
        
        if not file_path.exists():
            logger.error(f"图片未找到: {filename}")
            raise HTTPException(
                status_code=status.HTTP_404_NOT_FOUND,
                detail="图片未找到"
            )
        
        logger.info(f"提供图片: {filename}")
        return FileResponse(
            path=str(file_path),
            media_type='image/png',
            filename=filename
        )
    
    except HTTPException:
        raise
    except Exception as e:
        logger.error(f"获取图片异常: {str(e)}", exc_info=True)
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail=str(e)
        )


@router.get("/download/{filename}", summary="下载文件")
async def download_file(filename: str):
    """
    下载报告或其他文件
    """
    try:
        file_path = settings.get_upload_path(filename)
        
        if not file_path.exists():
            logger.error(f"文件未找到: {filename}")
            raise HTTPException(
                status_code=status.HTTP_404_NOT_FOUND,
                detail="文件未找到"
            )
        
        logger.info(f"下载文件: {filename}")
        return FileResponse(
            path=str(file_path),
            filename=filename,
            media_type='application/octet-stream'
        )
    
    except HTTPException:
        raise
    except Exception as e:
        logger.error(f"下载文件异常: {str(e)}", exc_info=True)
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail=str(e)
        )


@router.get("/list_uploads", summary="列出上传的文件")
async def list_uploads():
    """
    列出 uploads 目录中的文件
    """
    try:
        uploads_dir = settings.UPLOAD_DIR
        
        if not uploads_dir.exists():
            return {
                "success": True,
                "files": []
            }
        
        files = []
        for file_path in uploads_dir.iterdir():
            if file_path.is_file():
                files.append({
                    "name": file_path.name,
                    "size": file_path.stat().st_size,
                    "modified": file_path.stat().st_mtime
                })
        
        logger.info(f"列出 {len(files)} 个文件")
        return {
            "success": True,
            "files": sorted(files, key=lambda x: x['modified'], reverse=True)
        }
    
    except Exception as e:
        logger.error(f"列出文件异常: {str(e)}", exc_info=True)
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail=str(e)
        )