#include "mainwindow.h"

#include <QCoreApplication>
#include <QDebug>
#include <QGridLayout>
#include <QLabel>
#include <QListWidget>
#include <QPushButton>
#include <QTouchEvent>
#include <QDateTime>

#include <thread>

EventLogger::EventLogger() {}

bool EventLogger::eventFilter(QObject *, QEvent *pEvent)
{
    switch (pEvent->type()) {
    case QEvent::TouchBegin:
    case QEvent::TouchUpdate:
    case QEvent::TouchEnd: {
        auto *touchEvent = static_cast<QTouchEvent *>(pEvent);
        emit log(QString("%1 - type: %2 - #points: %3")
                     .arg(QDateTime::currentDateTime().toString("yyyyMMdd-hh:mm:ss.zzz"))
                     .arg(pEvent->type())
                     .arg(touchEvent->points().size()));
    } break;
    default:
        break;
    }

    return false;
}


EventFilter::EventFilter(QPushButton *pPushButton)
    : m_pButton(pPushButton)
{}

bool EventFilter::eventFilter(QObject *pWatched, QEvent *pEvent)
{
    if (m_pButton != pWatched) {
        return false;
    }

    switch (pEvent->type()) {
    case QEvent::TouchBegin: {
        emit log("processing events for 2s without user input");
        auto tp = std::chrono::steady_clock::now() + std::chrono::seconds(2);
        while (std::chrono::steady_clock::now() < tp) {
            QCoreApplication::processEvents(QEventLoop::ExcludeUserInputEvents);
            std::this_thread::sleep_for(std::chrono::milliseconds(100));
        }
        return false;
    }
    default:
        break;
    }

    return false;
}


MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    QWidget* pWidget = new QWidget(this);
    setCentralWidget(pWidget);
    QGridLayout* pLayout = new QGridLayout(this);
    pWidget->setLayout(pLayout);

    QPushButton* pButton = new QPushButton("Double tap here 1st", this);
    pButton->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::MinimumExpanding);
    pButton->setAttribute(Qt::WA_AcceptTouchEvents);

    pLayout->addWidget(pButton, 0, 0);

    QLabel* pLabel = new QLabel("Touch here next", this);
    pLabel->setAlignment(Qt::AlignCenter);
    pLayout->addWidget(pLabel,0,1);

    QListWidget* pListWidget = new QListWidget(this);
    QFont f;
    f.setFamily("Courier");
    pListWidget->setFont(f);
    pLayout->addWidget(pListWidget, 1, 0, 1, 2);

    EventLogger* pLogger = new EventLogger();
    qApp->installEventFilter(pLogger);

    connect(pLogger, &EventLogger::log, this, [pListWidget](const QString& s){
        pListWidget->addItem(s);
        pListWidget->scrollToBottom();
    });


    EventFilter* pFilter = new EventFilter(pButton);
    pButton->installEventFilter(pFilter);

    connect(pFilter, &EventFilter::log, this, [pListWidget](const QString& s){
        pListWidget->addItem(s);
        pListWidget->scrollToBottom();
    });


    resize(500,500);
}

MainWindow::~MainWindow()
{
}