#include "Widget.h"
#include "BoxController.h"
#include "Channel.h"
#include "Config.h"
#include "TcpServer.h"
#include "ui_Widget.h"
#include <QDebug>
#include <QDir>
#include <QScrollBar>

extern char* VideoPath;
extern QList<Channel*> channelList;

extern Widget::Widget(QWidget* parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);

    menu = new Menu(this);
    menu->hide();

    // set window background transparent
    QPalette pal = palette();
    pal.setBrush(QPalette::Base, Qt::transparent);
    setPalette(pal);
    setAttribute(Qt::WA_TranslucentBackground, true);

    // set list no scroll bar
    ui->listWidget->horizontalScrollBar()->hide();
    ui->listWidget->verticalScrollBar()->hide();
    ui->listWidget->hide();

    // serial port
    initSerialPort();

    // init command map
    initCommandMap();
}

Widget::~Widget()
{
    serialPort->close();
    delete ui;
}

/**
 * @brief open serial port and link the signals and slots
 */
void Widget::initSerialPort()
{
    // timer used to reopen serial port
    timer = new QTimer();
    timer->setInterval(1000);
    timer->stop();

    // serialport
    serialPort = new QSerialPort();
    serialPort->setPortName("ttyAMA2");
    serialPort->setBaudRate(QSerialPort::Baud115200);
    serialPort->setDataBits(QSerialPort::Data8);
    serialPort->setParity(QSerialPort::NoParity);
    serialPort->setStopBits(QSerialPort::OneStop);
    serialPort->setFlowControl(QSerialPort::NoFlowControl);
    if (serialPort->open(QIODevice::ReadWrite)) {
        qDebug() << "open serial port: /dev/ttyAMA2 success";
    } else {
        qDebug() << "open serial port: /dev/ttyAMA2 failed, ready to retry...";
        timer->start();
    }
    connect(serialPort, SIGNAL(error(QSerialPort::SerialPortError)), this, SLOT(onSerialError(QSerialPort::SerialPortError)));
    connect(serialPort, SIGNAL(readyRead()), this, SLOT(onReadyRead()));
}

/**
 * @brief get the video list of current channel, and show
 */
void Widget::showPlayList()
{
    // find the videos in dictionary "/root/usb/video"
    QString dirPath = QString("%1/%2").arg(VideoPath).arg(curChannelName);
    QDir dir(dirPath);
    if (!dir.exists()) {
        qDebug() << "dictionary /root/usb/videos dont exists";
        return;
    }
    dir.setFilter(QDir::Files);
    dir.setSorting(QDir::Name);
    QStringList nameFilters;
    nameFilters << "*.mp4";
    dir.setNameFilters(nameFilters);
    fileList = dir.entryList();

    ui->listWidget->clear();
    // append fileList to qlistwidget and show
    for (QString& file : fileList) {
        QListWidgetItem* item = new QListWidgetItem(file);
        ui->listWidget->addItem(item);
    }
    ui->listWidget->show();
    ui->listWidget->setCurrentRow(0);
}

/**
 * @brief try to reopen serial port
 */
void Widget::onTimeout()
{
    timer->stop();
    bool ret = serialPort->open(QIODevice::ReadWrite);
    // if open failed, then start timer and reopen
    if (!ret) {
        qDebug() << "reopen serial port: /dev/ttyAMA2 success";
        timer->start();
    } else {
        qDebug() << "reopen serial port: /dev/ttyAMA2 failed, ready to retry...";
    }
}

/**
 * @brief handling error
 * @param error
 */
void Widget::onSerialError(QSerialPort::SerialPortError error)
{
    if (error == QSerialPort::ResourceError) {
        qDebug() << "serial port break, try to reopen";
        serialPort->close();
        timer->start();
    }
}

/**
 * @brief map command from string to int
 */
void Widget::initCommandMap()
{
    commandMap.insert("A1", Playback);
    commandMap.insert("A2", Next);
    commandMap.insert("A3", Previous);
    commandMap.insert("A4", Forward);
    commandMap.insert("A5", Back);
    commandMap.insert("A6", Pause);
    commandMap.insert("A7", Return);
    commandMap.insert("A8", Enter);
}

/**
 * @brief receive data from serial port, and handle it
 */
void Widget::onReadyRead()
{
    serialPort->waitForReadyRead(100);
    QString data = serialPort->readLine();
    if (!commandMap.contains(data)) {
        qDebug() << QString("receive unkown command %1 from serial port: /dev/ttyAMA2").arg(data);
        return;
    }
    Command cmd = commandMap.value(data);
    switch (cmd) {
    case Playback: {
        if (menu->isVisible())
            return;
        menu->show();
    }
    case Previous: {
        // if show menu, then switch menu select
        if (menu->isVisible()) {
            menu->setCurChannel("HDMI-A");
        }
        // if menu hide, then select previous of listwidget
        else {
            int curRow = ui->listWidget->currentRow();
            if (curRow == 0)
                curRow = ui->listWidget->count();
            ui->listWidget->setCurrentRow(curRow - 1);
        }
        break;
    }
    case Next: {
        if (menu->isVisible()) {
            menu->setCurChannel("HDMI-B");
        } else {
            int curRow = ui->listWidget->currentRow();
            if (curRow == ui->listWidget->count() - 1) {
                curRow = -1;
            }
            ui->listWidget->setCurrentRow(curRow + 1);
        }
        break;
    }
    case Forward:
        if (isPlayback) {
            Channel* chn = Config::findChannelByName(curChannelName);
            chn->forward();
        }
        break;
    case Back:
        if (isPlayback) {
            Channel* chn = Config::findChannelByName(curChannelName);
            chn->back();
        }
        break;
    case Pause:
        if (isPlayback) {
            Channel* chn = Config::findChannelByName(curChannelName);
            chn->togglePause();
        }
        break;
    case Enter:
        // if menu show, then hide menu and show play list
        if (menu->isVisible()) {
            curChannelName = menu->getCurChannel();
            menu->hide();
            showPlayList();
        }
        // if menu hide, then current channel playback and other channel play live
        else {
            QString fileName = ui->listWidget->currentItem()->text();
            Channel* channel = nullptr;
            for (int i = 0; i < channelList.count(); i++) {
                if (channelList.at(i)->channelName == curChannelName) {
                    channel = channelList.at(i);
                }
                if (channelList.at(i)->isPlayback) {
                    channelList.at(i)->startPlayLive();
                }
            }
            if (channel)
                channel->startPlayback(fileName);
            ui->listWidget->hide();
        }
        break;
    case Return:
        if (menu->isVisible()) {
            menu->hide();
        }
        if (ui->listWidget->isVisible()) {
            ui->listWidget->hide();
        }
        if (isPlayback) {
            Channel* chn = Config::findChannelByName(curChannelName);
            chn->startPlayLive();
        }
        break;
    default:
        break;
    }
}