"""POST /openapi/v1/apps/<app_id>/files/upload — upload a file for use in app inputs."""

from __future__ import annotations

from flask import request
from flask_restx import Resource
from flask_restx.api import HTTPStatus
from werkzeug.exceptions import BadRequest

import services
from controllers.common.errors import (
    BlockedFileExtensionError,
    FilenameNotExistsError,
    FileTooLargeError,
    NoFileUploadedError,
    TooManyFilesError,
    UnsupportedFileTypeError,
)
from controllers.openapi import openapi_ns
from controllers.openapi.auth.composition import auth_router
from controllers.openapi.auth.data import AuthData
from extensions.ext_database import db
from fields.file_fields import FileResponse
from libs.oauth_bearer import Scope
from services.file_service import FileService


@openapi_ns.route("/apps/<string:app_id>/files/upload")
class AppFileUploadApi(Resource):
    @openapi_ns.doc("upload_file_for_app_input")
    @openapi_ns.doc(description="Upload a file to use as an input variable when running the app")
    @openapi_ns.doc(
        responses={
            201: "File uploaded successfully",
            400: "Bad request — no file or filename missing",
            401: "Unauthorized — invalid or expired bearer token",
            413: "File too large",
            415: "Unsupported file type or blocked extension",
        }
    )
    @openapi_ns.response(HTTPStatus.CREATED, "File uploaded", openapi_ns.models[FileResponse.__name__])
    @auth_router.guard(scope=Scope.APPS_RUN)
    def post(self, app_id: str, *, auth_data: AuthData):
        app_model, caller, _ = auth_data.require_app_context()
        if "file" not in request.files:
            raise NoFileUploadedError()
        if len(request.files) > 1:
            raise TooManyFilesError()

        file = request.files["file"]
        if not file.mimetype:
            raise UnsupportedFileTypeError()
        if not file.filename:
            raise FilenameNotExistsError()

        try:
            upload_file = FileService(db.engine).upload_file(
                filename=file.filename,
                content=file.stream.read(),
                mimetype=file.mimetype,
                user=caller,
            )
        except ValueError as exc:
            raise BadRequest(str(exc))
        except services.errors.file.FileTooLargeError as exc:
            raise FileTooLargeError(exc.description)
        except services.errors.file.UnsupportedFileTypeError:
            raise UnsupportedFileTypeError()
        except services.errors.file.BlockedFileExtensionError as exc:
            raise BlockedFileExtensionError(exc.description)

        response = FileResponse.model_validate(upload_file, from_attributes=True)
        return response.model_dump(mode="json"), 201