/**
 * Copyright © 2016-2024 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 io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.DefaultEventLoop;
import io.netty.handler.timeout.IdleStateEvent;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import java.util.concurrent.TimeUnit;

import static org.mockito.ArgumentMatchers.any;
import static org.mockito.ArgumentMatchers.eq;
import static org.mockito.Mockito.after;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

class MqttPingHandlerTest {

    static final int KEEP_ALIVE_SECONDS = 0;
    static final int PROCESS_SEND_DISCONNECT_MSG_TIME_MS = 500;

    MqttPingHandler mqttPingHandler;

    @BeforeEach
    void setUp() {
        mqttPingHandler = new MqttPingHandler(KEEP_ALIVE_SECONDS);
    }

    @Test
    void givenChannelReaderIdleState_whenNoPingResponse_thenDisconnectClient() throws Exception {
        ChannelHandlerContext ctx = mock(ChannelHandlerContext.class);
        Channel channel = mock(Channel.class);
        when(ctx.channel()).thenReturn(channel);
        when(channel.eventLoop()).thenReturn(new DefaultEventLoop());
        ChannelFuture channelFuture = mock(ChannelFuture.class);
        when(channel.writeAndFlush(any())).thenReturn(channelFuture);

        mqttPingHandler.userEventTriggered(ctx, IdleStateEvent.FIRST_READER_IDLE_STATE_EVENT);
        verify(
                channelFuture,
                after(TimeUnit.SECONDS.toMillis(KEEP_ALIVE_SECONDS) + PROCESS_SEND_DISCONNECT_MSG_TIME_MS)
        ).addListener(eq(ChannelFutureListener.CLOSE));
    }
}