#include "mainwindow.h"
#include "./ui_mainwindow.h"

#include <QPainter>
#include <QPropertyAnimation>

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

    this->setWindowFlags(Qt::FramelessWindowHint | Qt::WindowSystemMenuHint | Qt::WindowMinimizeButtonHint);
    this->setAttribute(Qt::WA_TranslucentBackground, true);

    m_bgLinearGradient.setColorAt(0, QColor(255, 255, 255, 25)); // a:0
    m_bgLinearGradient.setColorAt(1, QColor(255, 255, 255, 200));
    m_bgLinearGradient.setStart(0, 0);
    m_bgLinearGradient.setFinalStop(0, height());

    m_fadeOutAnimation = new QPropertyAnimation(this, "windowOpacity", this);
    m_fadeOutAnimation->setDuration(400);
    m_fadeOutAnimation->setStartValue(1);
    m_fadeOutAnimation->setEndValue(0);
    connect(m_fadeOutAnimation, &QPropertyAnimation::finished, this, &QMainWindow::close);
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::closeEvent(QCloseEvent *)
{
    qApp->exit();
}

void MainWindow::paintEvent(QPaintEvent * e)
{
    QPainter painter(this);

    painter.setBrush(QBrush(m_bgLinearGradient));
    painter.setPen(Qt::NoPen);
    painter.drawRect(0, 0, width(), height());

    return QMainWindow::paintEvent(e);
}

void MainWindow::mousePressEvent(QMouseEvent *event)
{
    if (event->buttons() & Qt::LeftButton && !isMaximized()) {
        m_clickedOnWindow = true;
        m_oldMousePos = event->pos();
        event->accept();
    }

    return QMainWindow::mousePressEvent(event);
}

void MainWindow::mouseMoveEvent(QMouseEvent *event)
{
    if (event->buttons() & Qt::LeftButton && m_clickedOnWindow) {
        move(event->globalPos() - m_oldMousePos);
        event->accept();
    }

    return QMainWindow::mouseMoveEvent(event);
}

void MainWindow::mouseReleaseEvent(QMouseEvent *event)
{
    m_clickedOnWindow = false;

    return QMainWindow::mouseReleaseEvent(event);
}

void MainWindow::on_closeWindowBtn_clicked()
{
    m_fadeOutAnimation->start();
}