/*
 * Copyright (c) 2023 Alex Spataru <https://github.com/alex-spataru>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "MainWindow.h"

MainWindow::MainWindow() {
    // Initialize layout-related widgets
    m_centralWidget = new QWidget(this);
    m_header = new QWidget(m_centralWidget);

    // Initialize horizontal layout widgets
    m_label = new QLabel(tr("Message") + ": ", m_header);
    m_pushButton = new QPushButton(tr("Generate QR Code"), m_header);
    m_lineEdit = new QLineEdit(m_header);

    // Initialize QR code image label
    m_qrCodeDisplay = new QLabel(m_centralWidget);
    m_qrCodeDisplay->setMinimumSize(QSize(500, 500));
    m_qrCodeDisplay->setMaximumSize(QSize(500, 500));

    // Setup horizontal layout for line edit & push button
    m_verticalLayout = new QVBoxLayout(m_centralWidget);
    m_headerLayout = new QHBoxLayout(m_header);
    m_headerLayout->addWidget(m_label);
    m_headerLayout->addWidget(m_lineEdit);
    m_headerLayout->addWidget(m_pushButton);
    m_headerLayout->setContentsMargins(0, 0, 0, 0);
    m_headerLayout->setStretch(1, 1);

    // Setup vertical layout with QR code label & QR code generation controls
    m_verticalLayout->addWidget(m_header);
    m_verticalLayout->addWidget(m_qrCodeDisplay);
    m_verticalLayout->setStretch(0, 1);

    // Set central widget & resize window to minimum size possible
    setCentralWidget(m_centralWidget);
    setFixedSize(minimumSize());

    // Set window title
    setWindowTitle(tr("QR Code Generator"));

    // Disable "Generate QR code" button when line edit contains empty text
    connect(m_lineEdit, &QLineEdit::textChanged, this, [this](const QString& text) {
        m_pushButton->setEnabled(!text.isEmpty());
    });

    // Update QR code when user clicks on the generate QR code button
    connect(m_pushButton, &QPushButton::clicked, this, &MainWindow::onGenerateButtonClicked);

    // Set "Hello World" text & generate QR code
    m_lineEdit->setText(tr("Hello World!"));
    onGenerateButtonClicked();
}

MainWindow::~MainWindow() {
    delete m_label;
    delete m_lineEdit;
    delete m_pushButton;
    delete m_qrCodeDisplay;
    delete m_headerLayout;
    delete m_verticalLayout;
    delete m_header;
    delete m_centralWidget;
}

void MainWindow::onGenerateButtonClicked() {
    // Get text from line edit
    auto text = m_lineEdit->text();

    // Generate QR code from text
    auto image = m_generator.generateQr(text);

    // Display generated image
    m_qrCodeDisplay->setPixmap(QPixmap::fromImage(image));
}