/**
 * Copyright © 2016-2020 The Thingsboard 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 org.thingsboard.mqtt;

import java.util.regex.Pattern;

final class MqttSubscription {

    private final String topic;
    private final Pattern topicRegex;
    private final MqttHandler handler;

    private final boolean once;

    private boolean called;

    MqttSubscription(String topic, MqttHandler handler, boolean once) {
        if(topic == null){
            throw new NullPointerException("topic");
        }
        if(handler == null){
            throw new NullPointerException("handler");
        }
        this.topic = topic;
        this.handler = handler;
        this.once = once;
        this.topicRegex = Pattern.compile(topic.replace("+", "[^/]+").replace("#", ".+") + "$");
    }

    String getTopic() {
        return topic;
    }

    public MqttHandler getHandler() {
        return handler;
    }

    boolean isOnce() {
        return once;
    }

    boolean isCalled() {
        return called;
    }

    boolean matches(String topic){
        return this.topicRegex.matcher(topic).matches();
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        MqttSubscription that = (MqttSubscription) o;

        return once == that.once && topic.equals(that.topic) && handler.equals(that.handler);
    }

    @Override
    public int hashCode() {
        int result = topic.hashCode();
        result = 31 * result + handler.hashCode();
        result = 31 * result + (once ? 1 : 0);
        return result;
    }

    void setCalled(boolean called) {
        this.called = called;
    }
}