/***
    This file is part of snapcast
    Copyright (C) 2014-2020  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/>.
***/

#include <assert.h>
#include <iostream>

#include "common/aixlog.hpp"
#include "common/snap_exception.hpp"
#include "common/str_compat.hpp"
#include "file_player.hpp"

using namespace std;

static constexpr auto LOG_TAG = "FilePlayer";
static constexpr auto kDefaultBuffer = 50ms;


FilePlayer::FilePlayer(boost::asio::io_context& io_context, const ClientSettings::Player& settings, std::shared_ptr<Stream> stream)
    : Player(io_context, settings, stream), timer_(io_context)
{
}


FilePlayer::~FilePlayer()
{
    LOG(DEBUG, LOG_TAG) << "Destructor\n";
    stop();
}


bool FilePlayer::needsThread() const
{
    return false;
}


void FilePlayer::requestAudio()
{
    auto numFrames = static_cast<uint32_t>(stream_->getFormat().msRate() * kDefaultBuffer.count());
    auto needed = numFrames * stream_->getFormat().frameSize();
    if (buffer_.size() < needed)
        buffer_.resize(needed);

    if (!stream_->getPlayerChunk(buffer_.data(), 100ms, numFrames))
    {
        // LOG(INFO, LOG_TAG) << "Failed to get chunk. Playing silence.\n";
        memset(buffer_.data(), 0, needed);
    }
    else
    {
        adjustVolume(static_cast<char*>(buffer_.data()), numFrames);
    }
    loop();
}


void FilePlayer::loop()
{
    next_request_ += kDefaultBuffer;
    auto now = std::chrono::steady_clock::now();
    if (next_request_ < now)
        next_request_ = now + 1ms;

    timer_.expires_at(next_request_);
    timer_.async_wait([this](boost::system::error_code ec) {
        if (ec)
            return;
        requestAudio();
    });
}


void FilePlayer::start()
{
    next_request_ = std::chrono::steady_clock::now();
    loop();
}


void FilePlayer::stop()
{
    LOG(INFO, LOG_TAG) << "Stop\n";
    timer_.cancel();
}