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/*
 * Copyright 2017-2024 noear.org and 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.noear.solon.net.stomp.impl;

import org.noear.solon.net.stomp.Header;
import org.noear.solon.net.stomp.Message;
import org.noear.solon.net.websocket.WebSocket;

import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;
import java.util.List;
import java.util.UUID;

/**
 * stomp 处理工具类
 *
 * @author limliu
 * @since 2.7
 */
public final class StompMessageSendingTemplate {

    /**
     *
     */
    private StompMessageOperations stompMessageOperations;

    /**
     * @param stompMessageOperations
     */
    public StompMessageSendingTemplate(StompMessageOperations stompMessageOperations) {
        this.stompMessageOperations = stompMessageOperations;
    }

    /**
     * 指定链接发送消息
     *
     * @param webSocket
     * @param message
     */
    public void send(WebSocket webSocket, Message message) {
        try {
            if (webSocket.isValid()) {
                webSocket.send(ByteBuffer.wrap(stompMessageOperations.getMsgCodec().encode(message).getBytes(StandardCharsets.UTF_8)));
            }
        } finally {
            if (!webSocket.isValid()) {
                webSocket.close();
            }
        }
    }

    /**
     * 给指定通道发送消息
     *
     * @param destination
     * @param payload
     */
    public void send(String destination, String payload) {
        send(destination, payload, null, null);
    }

    /**
     * 给指定通道发送消息
     *
     * @param destination
     * @param payload
     * @param headers
     */
    public void send(String destination, String payload, List headers) {
        send(destination, payload, null, headers);
    }

    /**
     * 给指定通道发送消息
     *
     * @param destination
     * @param payload
     * @param contentType
     */
    public void send(String destination, String payload, String contentType) {
        send(destination, payload, contentType, null);
    }

    /**
     * 给指定通道发送消息
     *
     * @param destination 通道，支持模糊匹配，如/topic/**
     * @param payload     消息内容
     * @param contentType 消息类型
     * @param headers     消息head信息
     */
    public void send(String destination, String payload, String contentType, List headers) {
        stompMessageOperations.getDestinationInfoSet().parallelStream().filter(destinationInfo -> {
            return stompMessageOperations.getDestinationMatch().get(destinationInfo.getDestination()).matcher(destination).matches();
        }).forEach(destinationInfo -> {
            WebSocket sendSocket = stompMessageOperations.getWebSocketMap().get(destinationInfo.getSessionId());
            if (sendSocket == null) {
                return;
            }
            send(sendSocket, transform(Commands.MESSAGE, destinationInfo.getDestination(), payload, contentType, Arrays.asList(new Header(Header.SUBSCRIPTION, destinationInfo.getSubscription()), new Header(Header.MESSAGE_ID, UUID.randomUUID().toString()))));
        });
    }

    /**
     * 消息转换
     *
     * @param command
     * @param destination
     * @param payload
     * @return
     */
    public Message transform(String command, String destination, String payload) {
        return transform(command, destination, payload, null, null);
    }

    /**
     * 消息转换
     *
     * @param command
     * @param destination
     * @param payload
     * @param contentType
     * @return
     */
    public Message transform(String command, String destination, String payload, String contentType) {
        return transform(command, destination, payload, contentType, null);
    }

    /**
     * 消息转换
     *
     * @param command
     * @param destination
     * @param payload
     * @param headers
     * @return
     */
    public Message transform(String command, String destination, String payload, List headers) {
        return transform(command, destination, payload, null, headers);
    }

    /**
     * 消息转换
     *
     * @param command
     * @param destination
     * @param payload
     * @param contentType
     * @param headers
     * @return
     */
    public Message transform(String command, String destination, String payload, String contentType, List headers) {
        Message replyMessage = new MessageImpl(command, payload);
        if (contentType != null && contentType.length() > 0) {
            replyMessage.addHeader(Header.CONTENT_TYPE, contentType);
        }
        replyMessage.addHeader(Header.DESTINATION, destination);
        if (headers != null && headers.size() > 0) {
            replyMessage.getHeaderAll().addAll(headers);
        }
        return replyMessage;
    }
}