from typing import List

from fastapi import APIRouter, Depends, File, UploadFile, status
from fastapi.responses import FileResponse

from app.database import get_database
from app.models.todo import Attachment
from app.services.file_service import FileService

router = APIRouter(prefix="/api/todos", tags=["attachments"])


def _get_service(db=Depends(get_database)) -> FileService:
    return FileService(db)


@router.post(
    "/{todo_id}/attachments",
    response_model=list[Attachment],
    status_code=status.HTTP_201_CREATED,
)
async def upload_attachments(
    todo_id: str,
    files: List[UploadFile] = File(...),
    service: FileService = Depends(_get_service),
):
    """파일 업로드 (최대 5개, 파일당 10MB)"""
    return await service.upload_files(todo_id, files)


@router.get("/{todo_id}/attachments/{attachment_id}/download")
async def download_attachment(
    todo_id: str,
    attachment_id: str,
    service: FileService = Depends(_get_service),
):
    """파일 다운로드"""
    file_path, filename = await service.get_file_info(todo_id, attachment_id)
    return FileResponse(
        path=str(file_path),
        filename=filename,
        media_type="application/octet-stream",
    )


@router.delete(
    "/{todo_id}/attachments/{attachment_id}",
    status_code=status.HTTP_204_NO_CONTENT,
)
async def delete_attachment(
    todo_id: str,
    attachment_id: str,
    service: FileService = Depends(_get_service),
):
    """첨부파일 삭제"""
    await service.delete_attachment(todo_id, attachment_id)