import os
from fastapi import APIRouter, UploadFile, File, HTTPException
from typing import List
from app.core.config import settings
from app.utils.file_ops import save_upload_file, delete_file

router = APIRouter()


@router.post("/upload", summary="上传图片 (Multipart)")
async def upload_image(file: UploadFile = File(...)):
    """
    接收文件上传，保存并返回可访问的 URL。
    树莓派调用此接口。
    """
    if not file.content_type.startswith("image/"):
        raise HTTPException(status_code=400, detail="File must be an image")

    try:
        # 保存文件
        filename = await save_upload_file(file)

        # 拼接完整的 URL 地址
        file_url = f"{settings.BASE_URL}/static/{filename}"

        return {
            "status": "success",
            "filename": filename,
            "url": file_url
        }
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Upload failed: {str(e)}")


# --- 赠送的实用接口 ---

@router.get("/images", summary="列出所有已上传图片")
async def list_images():
    """查看服务器上现在存了哪些图片 (调试用)"""
    if not os.path.exists(settings.UPLOAD_PATH):
        return []

    files = sorted(os.listdir(settings.UPLOAD_PATH), reverse=True)  # 按时间倒序(假设文件名带时间戳)

    image_list = []
    for f in files:
        if f.lower().endswith(('.png', '.jpg', '.jpeg', '.gif')):
            image_list.append({
                "filename": f,
                "url": f"{settings.BASE_URL}/static/{f}"
            })
    return image_list


@router.delete("/images/{filename}", summary="删除指定图片")
async def delete_image(filename: str):
    """清理图片"""
    success = delete_file(filename)
    if not success:
        raise HTTPException(status_code=404, detail="File not found")
    return {"status": "deleted", "filename": filename}