/*
 * Copyright 2012-2019 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
 *
 *      https://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 org.springframework.boot.autoconfigure.websocket.reactive;

import javax.servlet.Servlet;
import javax.websocket.server.ServerContainer;

import org.apache.catalina.startup.Tomcat;
import org.apache.tomcat.websocket.server.WsSci;

import org.springframework.boot.autoconfigure.AutoConfigureBefore;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication.Type;
import org.springframework.boot.autoconfigure.web.reactive.ReactiveWebServerFactoryAutoConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * Auto configuration for WebSocket reactive server in Tomcat, Jetty or Undertow. Requires
 * the appropriate WebSocket modules to be on the classpath.
 * <p>
 * If Tomcat's WebSocket support is detected on the classpath we add a customizer that
 * installs the Tomcat WebSocket initializer.
 *
 * @author Brian Clozel
 * @since 2.0.0
 */
@Configuration
@ConditionalOnClass({ Servlet.class, ServerContainer.class })
@ConditionalOnWebApplication(type = Type.REACTIVE)
@AutoConfigureBefore(ReactiveWebServerFactoryAutoConfiguration.class)
public class WebSocketReactiveAutoConfiguration {

	@Configuration
	@ConditionalOnClass({ Tomcat.class, WsSci.class })
	static class TomcatWebSocketConfiguration {

		@Bean
		@ConditionalOnMissingBean(name = "websocketReactiveWebServerCustomizer")
		public TomcatWebSocketReactiveWebServerCustomizer websocketReactiveWebServerCustomizer() {
			return new TomcatWebSocketReactiveWebServerCustomizer();
		}

	}

}
