from typing import Optional
import json

from fastapi import APIRouter, File, Request, UploadFile
from pydantic import BaseModel

from services.oss_service import oss_service

router = APIRouter()


@router.post("/oss/upload")
async def upload(
    request: Request,
    file: UploadFile = File(...),
):
    """Upload a generic file to OSS."""
    user = request.state.user
    if not user:
        return {"statusCode": 401, "msg": "未授权"}

    try:
        content = await file.read()
        file_url = oss_service.upload_file(content, file.filename)
        return {
            "statusCode": 200,
            "msg": "上传成功",
            "data": {"file_url": file_url},
        }
    except Exception as e:
        return {"statusCode": 500, "msg": f"上传失败: {str(e)}"}


@router.post("/oss/shudao/upload_image")
async def upload_image(
    request: Request,
    file: Optional[UploadFile] = File(None),
    image: Optional[UploadFile] = File(None),
):
    """Upload an image to OSS.

    Supports both the current `file` form field and the legacy `image` field
    used by the existing frontend.
    """
    user = request.state.user
    if not user:
        return {"statusCode": 401, "msg": "未授权"}

    try:
        upload_file = image or file
        if not upload_file:
            return {"statusCode": 422, "msg": "缺少图片文件"}

        content = await upload_file.read()
        file_url = oss_service.upload_image(content, upload_file.filename)
        return {
            "statusCode": 200,
            "msg": "上传成功",
            "fileUrl": file_url,
            "fileURL": file_url,
            "fileName": upload_file.filename,
            "fileSize": len(content),
            "data": {
                "image_url": file_url,
                "file_url": file_url,
                "file_name": upload_file.filename,
                "file_size": len(content),
            },
        }
    except Exception as e:
        return {"statusCode": 500, "msg": f"上传失败: {str(e)}"}


class UploadJsonRequest(BaseModel):
    filename: str
    content: dict


@router.post("/oss/shudao/upload_json")
async def upload_ppt_json(
    request: Request,
    data: UploadJsonRequest,
):
    """Upload JSON content to OSS."""
    user = request.state.user
    if not user:
        return {"statusCode": 401, "msg": "未授权"}

    try:
        json_str = json.dumps(data.content, ensure_ascii=False)
        file_url = oss_service.upload_json(json_str, data.filename)
        return {
            "statusCode": 200,
            "msg": "上传成功",
            "data": {"file_url": file_url},
        }
    except Exception as e:
        return {"statusCode": 500, "msg": f"上传失败: {str(e)}"}


@router.get("/oss/parse")
async def parse_oss(url: str, request: Request):
    """Resolve an OSS proxy URL."""
    user = request.state.user
    if not user:
        return {"statusCode": 401, "msg": "未授权"}

    try:
        decrypted_url = oss_service.parse_url(url)
        return {
            "statusCode": 200,
            "msg": "success",
            "data": {"url": decrypted_url},
        }
    except Exception as e:
        return {"statusCode": 500, "msg": f"解析失败: {str(e)}"}


@router.get("/get_file_link")
async def get_file_link(
    filename: str,
    request: Request,
):
    """Get a signed OSS URL by filename."""
    user = request.state.user
    if not user:
        return {"statusCode": 401, "msg": "未授权"}

    try:
        file_url = oss_service.get_signed_url(filename)
        return {
            "statusCode": 200,
            "msg": "success",
            "data": {"file_url": file_url},
        }
    except Exception as e:
        return {"statusCode": 500, "msg": f"获取失败: {str(e)}"}