//  Copyright 2023 Harness, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package utils

import (
	"errors"
	"fmt"
	"io"
	"mime/multipart"
	"net/http"
)

func GetFileReader(r *http.Request, formKey string) (*multipart.Part, string, error) {
	reader, err := r.MultipartReader()
	if err != nil {
		return nil, "", err
	}

	for {
		part, err := reader.NextPart()
		if errors.Is(err, io.EOF) {
			break
		}
		if err != nil {
			return nil, "", err
		}

		if part.FormName() == formKey {
			filename := part.FileName()
			return part, filename, nil
		}
	}

	return nil, "", fmt.Errorf("file not found in request")
}