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/*
 * Copyright © 2009 HotPads ([email protected])
 *
 * 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 io.datarouter.gcp.gcs;

import java.time.Duration;

import io.datarouter.enums.StringMappedEnum;

public class GcsHeaders{

	public static final String KEY_ACL = "x-goog-acl";
	public static final String KEY_CONTENT_TYPE = "Content-Type";
	public static final String KEY_CACHE_CONTROL = "Cache-Control";

	public static final String ACL_PUBLIC_READ = "public-read";
	public static final String ACL_PRIVATE = "private";

	public static final String CACHE_CONTROL_NO_CACHE = "no-cache";
	public static final String CACHE_CONTROL_MINUTES_20 = makeCacheControlString(Duration.ofMinutes(20));
	public static final String CACHE_CONTROL_WEEKS_1 = makeCacheControlString(Duration.ofDays(7));
	public static final String CACHE_CONTROL_MONTHS_1 = makeCacheControlString(Duration.ofDays(30));
	public static final String CACHE_CONTROL_YEARS_10 = makeCacheControlString(Duration.ofDays(365 * 10));

	private static String makeCacheControlString(Duration duration){
		long seconds = duration.toSeconds();
		return "max-age=" + seconds + ", public";
	}

	public static String getExtensionForContentType(String contentType){
		ContentType type = ContentType.BY_MIME_TYPE.fromOrNull(contentType);
		if(type == null){
			return null;
		}
		return type.extension;
	}

	public interface GcsContentType{

		String getMimeType();

	}

	public enum ContentType implements GcsContentType{
		PNG("image/png", "png"),
		JPEG("image/jpeg", "jpg"),
		SWF("application/x-shockwave-flash", "swf"),
		TEXT_PLAIN("text/plain", "txt"),
		TEXT_CSV("text/csv", "csv"),
		TEXT_TSV("text/tsv", "tsv"),
		TEXT_XML("text/xml", "xml"),
		TEXT_SHELLSCRIPT("text/x-shellscript", "sh"),
		APPLICATION_XML("application/xml", null), // s3's default
		TEXT_HTML("text/html", "html"),
		MULTIPART_MIXED("multipart/mixed", null),
		GZIP("application/x-gzip", "gz"),
		ZIP("application/zip", "zip"),
		BINARY("binary/octet-stream", null);

		public static final StringMappedEnum BY_MIME_TYPE
				= new StringMappedEnum<>(values(), value -> value.mimeType);

		public final String mimeType;
		public final String extension;

		ContentType(String mimeType, String extension){
			this.mimeType = mimeType;
			this.extension = extension;
		}

		@Override
		public String getMimeType(){
			return mimeType;
		}

		public static ContentType fromExtension(String ext){
			ext = ext.toLowerCase();
			for(ContentType type : values()){
				if(ext.equals(type.extension)){
					return type;
				}
			}
			return APPLICATION_XML;
		}

	}
}