/*
 * Copyright 2016 the original author or authors.
 *
 * 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 com.greglturnquist.learningspringboot.chat;

import java.util.HashMap;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Profile;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.reactive.HandlerMapping;
import org.springframework.web.reactive.handler.SimpleUrlHandlerMapping;
import org.springframework.web.reactive.socket.WebSocketHandler;
import org.springframework.web.reactive.socket.server.support.WebSocketHandlerAdapter;

/**
 * @author Greg Turnquist
 */
// tag::intro[]
@Configuration
public class WebSocketConfig {
// end::intro[]

	// tag::cloud-1[]
	@Profile("cloud")
	@Configuration
	@EnableConfigurationProperties(ChatConfigProperties.class)
	static class CloudBasedWebSocketConfig {
	// end::cloud-1[]

		private static final Logger log = LoggerFactory.getLogger(CloudBasedWebSocketConfig.class);

		// tag::cloud-2[]
		private final ChatConfigProperties chatConfigProperties;

		CloudBasedWebSocketConfig(ChatConfigProperties chatConfigProperties) {
			this.chatConfigProperties = chatConfigProperties;
		}
		// end::cloud-2[]

		// tag::cors[]
		@Bean
		HandlerMapping webSocketMapping(CommentService commentService,
										InboundChatService inboundChatService,
										OutboundChatService outboundChatService) {
			SimpleUrlHandlerMapping mapping =
				configureUrlMappings(commentService, inboundChatService, outboundChatService);

			Map<String, CorsConfiguration> corsConfigurationMap = new HashMap<>();
			CorsConfiguration corsConfiguration = new CorsConfiguration();
			corsConfiguration.addAllowedOrigin(chatConfigProperties.getOrigin());

			mapping.getUrlMap().keySet().forEach(route ->
				corsConfigurationMap.put(route, corsConfiguration)
			);

			mapping.setCorsConfigurations(corsConfigurationMap);

			return mapping;
		}
		// end::cors[]
	}

	// tag::websocket-non-cloud[]
	@Profile("!cloud")
	@Configuration
	static class LocalWebSocketConfig {
	// end::websocket-non-cloud[]

		// tag::non-cloud-configure-inbound[]
		@Bean
		HandlerMapping webSocketMapping(CommentService commentService,
										InboundChatService inboundChatService,
										OutboundChatService outboundChatService) {
			return configureUrlMappings(commentService, inboundChatService, outboundChatService);
		}
		// end::non-cloud-configure-inbound[]
	}


	@Bean
	WebSocketHandlerAdapter handlerAdapter() {
		return new WebSocketHandlerAdapter();
	}

	// tag::url-mappings[]
	private static SimpleUrlHandlerMapping configureUrlMappings(CommentService commentService,
														 InboundChatService inboundChatService,
														 OutboundChatService outboundChatService) {
		Map<String, WebSocketHandler> urlMap = new HashMap<>();
		urlMap.put("/topic/comments.new", commentService);
		urlMap.put("/app/chatMessage.new", inboundChatService);
		urlMap.put("/topic/chatMessage.new", outboundChatService);

		SimpleUrlHandlerMapping mapping = new SimpleUrlHandlerMapping();
		mapping.setOrder(10);
		mapping.setUrlMap(urlMap);

		return mapping;
	}
	// end::url-mappings[]
}