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目前它只是一个物联网通信的工具，包含 1、西门子S7通信协议，支持西门子S1500，S1200，S400，S300，S200Smart，西门子机床828D; 2、Modbus通信协议，支持ModbusTcp, ModbusRtuOverTcp, ModbusAsciiOverTcp, ModbusTcpServer; 3、三菱Melsec（MC）通信协议，支持PLC iQ-R系列, Q/L系列, QnA系列, A系列, 目前只测试了L系列和FX5U; 4、RTSP, RTCP, RTP, H264, MP4 (FMP4)协议，RTSP + H264 + FMP4 + WebSocket + MSE + WEB; 5、基础字节数组解析转换工具;

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/*
 * MIT License
 *
 * Copyright (c) 2021-2099 Oscura (xingshuang) 
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.github.xingshuangs.iot.protocol.rtcp.model;


import com.github.xingshuangs.iot.common.buff.ByteReadBuff;
import com.github.xingshuangs.iot.common.buff.ByteWriteBuff;
import com.github.xingshuangs.iot.protocol.rtcp.enums.ERtcpPackageType;
import lombok.Data;
import lombok.EqualsAndHashCode;

import java.util.ArrayList;
import java.util.List;

/**
 * 接收者报告
 * 0                   1                   2                   3
 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |V=2|P|    RC   |   PT=RR=201   |             length            |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |                     SSRC of packet sender                     |
 * +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
 * |                 SSRC_1 (SSRC of first source)                 |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * | fraction lost |       cumulative number of packets lost       |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |           extended highest sequence number received           |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |                      interarrival jitter                      |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |                         last SR (LSR)                         |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |                   delay since last SR (DLSR)                  |
 * +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
 * |                 SSRC_2 (SSRC of second source)                |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * :                               ...                             :
 * +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
 * |                  profile-specific extensions                  |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 *
 * @author xingshuang
 */
@Data
@EqualsAndHashCode(callSuper = true)
public final class RtcpReceiverReport extends RtcpBasePackage {

    /**
     * Source id.
     * (同步源（SSRC of sender）：32比特，SR包发送者的同步源标识符。与对应RTP包中的SSRC一样。)
     */
    private long sourceId;

    /**
     * Report blocks.
     * (报告数据块)
     */
    private List reportBlocks = new ArrayList<>();

    public RtcpReceiverReport() {
    }

    public RtcpReceiverReport(long sourceId) {
        this.header = new RtcpHeader();
        this.header.version = 2;
        this.header.padding = false;
        this.header.receptionCount = 0;
        this.header.packageType = ERtcpPackageType.RR;
        this.header.length = 1;
        this.sourceId = sourceId;
    }

    public void addRtcpReportBlock(RtcpReportBlock reportBlock) {
        this.reportBlocks.add(reportBlock);
        this.header.receptionCount = this.reportBlocks.size();
        this.header.length = this.byteArrayLength() / 4 - 1;
    }

    @Override
    public int byteArrayLength() {
        int length = 0;
        length += this.header != null ? this.header.byteArrayLength() : 0;
        length += 4;
        for (RtcpReportBlock block : this.reportBlocks) {
            length += block.byteArrayLength();
        }
        return length;
    }

    @Override
    public byte[] toByteArray() {
        ByteWriteBuff buff = ByteWriteBuff.newInstance(this.byteArrayLength());
        if (this.header != null) {
            buff.putBytes(this.header.toByteArray());
        }
        buff.putInteger(this.sourceId);
        for (RtcpReportBlock block : this.reportBlocks) {
            buff.putBytes(block.toByteArray());
        }
        return buff.getData();
    }

    /**
     * Parses byte array and converts it to object.
     *
     * @param data byte array
     * @return RtcpHeader
     */
    public static RtcpReceiverReport fromBytes(final byte[] data) {
        return fromBytes(data, 0);
    }

    /**
     * Parses byte array and converts it to object.
     *
     * @param data   byte array
     * @param offset index offset
     * @return RtcpHeader
     */
    public static RtcpReceiverReport fromBytes(final byte[] data, final int offset) {
        if (data.length < 8) {
            throw new IndexOutOfBoundsException("RtcpReceiverReport, data length < 8");
        }
        int off = offset;
        RtcpReceiverReport res = new RtcpReceiverReport();
        res.header = RtcpHeader.fromBytes(data, off);
        off += res.header.byteArrayLength();

        res.sourceId = ByteReadBuff.newInstance(data, off).getUInt32();
        off += 4;

        for (int i = 0; i < res.header.getReceptionCount(); i++) {
            RtcpReportBlock reportBlock = RtcpReportBlock.fromBytes(data, off);
            res.reportBlocks.add(reportBlock);
            off += reportBlock.byteArrayLength();
        }
        return res;
    }
}