/***
    This file is part of snapcast
    Copyright (C) 2014-2025  Johannes Pohl

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
***/

#pragma once

// local headers
#include "common/time_defs.hpp"
#include "message.hpp"

// standard headers
#include <chrono>
#include <cstdlib>
#include <cstring>
#include <iostream>


namespace msg
{

/**
 * Piece of raw data
 * Has information about "when" captured (timestamp)
 */
class WireChunk : public BaseMessage
{
public:
    /// c'tor
    explicit WireChunk(uint32_t size = 0) : BaseMessage(message_type::kWireChunk), payloadSize(size)
    {
        if (size > 0)
            payload = static_cast<char*>(malloc(size * sizeof(char)));
    }

    /// c'tor
    WireChunk(const WireChunk& wireChunk) : BaseMessage(message_type::kWireChunk), timestamp(wireChunk.timestamp), payloadSize(wireChunk.payloadSize)
    {
        payload = static_cast<char*>(malloc(payloadSize));
        memcpy(payload, wireChunk.payload, payloadSize);
    }

    /// d'tor
    ~WireChunk() override
    {
        free(payload);
    }

    void read(std::istream& stream) override
    {
        readVal(stream, timestamp.sec);
        readVal(stream, timestamp.usec);
        readVal(stream, &payload, payloadSize);
    }

    uint32_t getSize() const override
    {
        return sizeof(tv) + sizeof(int32_t) + payloadSize;
    }

    /// @return playout time of the chunk (server time)
    virtual chronos::time_point_clk start() const
    {
        return chronos::time_point_clk(chronos::sec(timestamp.sec) + chronos::usec(timestamp.usec));
    }

    tv timestamp;           ///< playout timestamp (server time)
    uint32_t payloadSize;   ///< size of the payload
    char* payload{nullptr}; ///< raw chunk payload

    /// @return tuple of payload and payload size
    template <typename T>
    std::pair<T*, size_t> getPayload() const
    {
        return std::make_pair<T*, size_t>(reinterpret_cast<T*>(payload), payloadSize / sizeof(T));
    }

protected:
    void doserialize(std::ostream& stream) const override
    {
        writeVal(stream, timestamp.sec);
        writeVal(stream, timestamp.usec);
        writeVal(stream, payload, payloadSize);
    }
};
} // namespace msg
