package com.tashow.cloud.websocket.config;

import com.tashow.cloud.websocket.core.handler.JsonWebSocketMessageHandler;
import com.tashow.cloud.websocket.core.listener.WebSocketMessageListener;
import com.tashow.cloud.websocket.core.security.LoginUserHandshakeInterceptor;
import com.tashow.cloud.websocket.core.security.WebSocketAuthorizeRequestsCustomizer;
import com.tashow.cloud.websocket.core.sender.local.LocalWebSocketMessageSender;
import com.tashow.cloud.websocket.core.sender.rabbitmq.RabbitMQWebSocketMessageConsumer;
import com.tashow.cloud.websocket.core.sender.rabbitmq.RabbitMQWebSocketMessageSender;
import com.tashow.cloud.websocket.core.session.WebSocketSessionHandlerDecorator;
import com.tashow.cloud.websocket.core.session.WebSocketSessionManager;
import com.tashow.cloud.websocket.core.session.WebSocketSessionManagerImpl;
import org.springframework.amqp.core.TopicExchange;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.AutoConfiguration;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.web.socket.config.annotation.EnableWebSocket;
import org.springframework.web.socket.config.annotation.WebSocketConfigurer;
import org.springframework.web.socket.server.HandshakeInterceptor;

import java.util.List;

/**
 * WebSocket 自动配置
 *
 * @author xingyu4j
 */
@AutoConfiguration
@EnableWebSocket // 开启 websocket
@ConditionalOnProperty(prefix = "tashow.websocket", value = "enable", matchIfMissing = true) // 允许使用 yudao.websocket.enable=false 禁用 websocket
@EnableConfigurationProperties(WebSocketProperties.class)
public class WebSocketAutoConfiguration {

    @Bean
    public WebSocketConfigurer webSocketConfigurer(HandshakeInterceptor[] handshakeInterceptors,
                                                   WebSocketHandler webSocketHandler,
                                                   WebSocketProperties webSocketProperties) {
        return registry -> registry
                // 添加 WebSocketHandler
                .addHandler(webSocketHandler, webSocketProperties.getPath())
                .addInterceptors(handshakeInterceptors)
                // 允许跨域，否则前端连接会直接断开
                .setAllowedOriginPatterns("*");
    }

    @Bean
    public HandshakeInterceptor handshakeInterceptor() {
        return new LoginUserHandshakeInterceptor();
    }

    @Bean
    public WebSocketHandler webSocketHandler(WebSocketSessionManager sessionManager,
                                             List<? extends WebSocketMessageListener<?>> messageListeners) {
        // 1. 创建 JsonWebSocketMessageHandler 对象，处理消息
        JsonWebSocketMessageHandler messageHandler = new JsonWebSocketMessageHandler(messageListeners);
        // 2. 创建 WebSocketSessionHandlerDecorator 对象，处理连接
        return new WebSocketSessionHandlerDecorator(messageHandler, sessionManager);
    }

    @Bean
    public WebSocketSessionManager webSocketSessionManager() {
        return new WebSocketSessionManagerImpl();
    }

    @Bean
    public WebSocketAuthorizeRequestsCustomizer webSocketAuthorizeRequestsCustomizer(WebSocketProperties webSocketProperties) {
        return new WebSocketAuthorizeRequestsCustomizer(webSocketProperties);
    }

    // ==================== Sender 相关 ====================

    @Configuration
    @ConditionalOnProperty(prefix = "tashow.websocket", name = "sender-type", havingValue = "local")
    public class LocalWebSocketMessageSenderConfiguration {

        @Bean
        public LocalWebSocketMessageSender localWebSocketMessageSender(WebSocketSessionManager sessionManager) {
            return new LocalWebSocketMessageSender(sessionManager);
        }

    }

    @Configuration
    @ConditionalOnProperty(prefix = "tashow.websocket", name = "sender-type", havingValue = "rabbitmq")
    public class RabbitMQWebSocketMessageSenderConfiguration {

        @Bean
        public RabbitMQWebSocketMessageSender rabbitMQWebSocketMessageSender(
                WebSocketSessionManager sessionManager, RabbitTemplate rabbitTemplate,
                TopicExchange websocketTopicExchange) {
            return new RabbitMQWebSocketMessageSender(sessionManager, rabbitTemplate, websocketTopicExchange);
        }

        @Bean
        public RabbitMQWebSocketMessageConsumer rabbitMQWebSocketMessageConsumer(
                RabbitMQWebSocketMessageSender rabbitMQWebSocketMessageSender) {
            return new RabbitMQWebSocketMessageConsumer(rabbitMQWebSocketMessageSender);
        }

        /**
         * 创建 Topic Exchange
         */
        @Bean
        public TopicExchange websocketTopicExchange(@Value("${tashow.websocket.sender-rabbitmq.exchange}") String exchange) {
            return new TopicExchange(exchange,
                    true,  // durable: 是否持久化
                    false);  // exclusive: 是否排它
        }

    }

}
