package atscfg

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

// ContentTypeBGFetchDotConfig is the MIME type of the contents of a
// bg_fetch.config file.
const ContentTypeBGFetchDotConfig = ContentTypeTextASCII

// LineCommentBGFetchDotConfig is the string understood by parsers of
// bg_fetch.config files to be the beginning of a line comment.
const LineCommentBGFetchDotConfig = LineCommentHash

// BGFetchDotConfigOpts contains settings to configure generation options.
type BGFetchDotConfigOpts struct {
	// HdrComment is the header comment to include at the beginning of the file.
	// This should be the text desired, without comment syntax (like # or //). The file's comment syntax will be added.
	// To omit the header comment, pass the empty string.
	HdrComment string
}

// MakeBGFetchDotConfig constructs a 'bg_fetch.config' file for the given
// server with the given header comment content.
func MakeBGFetchDotConfig(
	server *Server,
	opt *BGFetchDotConfigOpts,
) (Cfg, error) {
	if opt == nil {
		opt = &BGFetchDotConfigOpts{}
	}
	warnings := []string{}

	if server.CDN == "" {
		return Cfg{}, makeErr(warnings, "server missing CDNName")
	}

	text := makeHdrComment(opt.HdrComment)
	text += "include User-Agent *\n"

	return Cfg{
		Text:        text,
		ContentType: ContentTypeBGFetchDotConfig,
		LineComment: LineCommentBGFetchDotConfig,
		Warnings:    warnings,
	}, nil
}
