/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
**   * Redistributions of source code must retain the above copyright
**     notice, this list of conditions and the following disclaimer.
**   * Redistributions in binary form must reproduce the above copyright
**     notice, this list of conditions and the following disclaimer in
**     the documentation and/or other materials provided with the
**     distribution.
**   * Neither the name of The Qt Company Ltd nor the names of its
**     contributors may be used to endorse or promote products derived
**     from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "mainwindow.h"
#include "pieceslist.h"
#include "puzzlewidget.h"

#include <QtWidgets>
#include <stdlib.h>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    setupMenus();
    setupWidgets();

    setSizePolicy(QSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed));
    setWindowTitle(tr("Puzzle"));
}

void MainWindow::openImage()
{
    const QString fileName =
        QFileDialog::getOpenFileName(this, tr("Open Image"), QString(),
                                     tr("Image Files (*.png *.jpg *.bmp)"));

    if (!fileName.isEmpty())
        loadImage(fileName);
}

void MainWindow::loadImage(const QString &fileName)
{
    QPixmap newImage;
    if (!newImage.load(fileName)) {
        QMessageBox::warning(this, tr("Open Image"),
                             tr("The image file could not be loaded."),
                             QMessageBox::Close);
        return;
    }
    puzzleImage = newImage;
    setupPuzzle();
}

void MainWindow::setCompleted()
{
    QMessageBox::information(this, tr("Puzzle Completed"),
                             tr("Congratulations! You have completed the puzzle!\n"
                                "Click OK to start again."),
                             QMessageBox::Ok);

    setupPuzzle();
}

void MainWindow::setupPuzzle()
{
    int size = qMin(puzzleImage.width(), puzzleImage.height());
    puzzleImage = puzzleImage.copy((puzzleImage.width() - size)/2,
        (puzzleImage.height() - size)/2, size, size).scaled(puzzleWidget->width(),
            puzzleWidget->height(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation);

    piecesList->clear();

    for (int y = 0; y < 5; ++y) {
        for (int x = 0; x < 5; ++x) {
            int pieceSize = puzzleWidget->pieceSize();
            QPixmap pieceImage = puzzleImage.copy(x * pieceSize, y * pieceSize, pieceSize, pieceSize);
            piecesList->addPiece(pieceImage, QPoint(x, y));
        }
    }

    qsrand(QCursor::pos().x() ^ QCursor::pos().y());

    for (int i = 0; i < piecesList->count(); ++i) {
        if (int(2.0*qrand()/(RAND_MAX+1.0)) == 1) {
            QListWidgetItem *item = piecesList->takeItem(i);
            piecesList->insertItem(0, item);
        }
    }

    puzzleWidget->clear();
}

void MainWindow::setupMenus()
{
    QMenu *fileMenu = menuBar()->addMenu(tr("&File"));

    QAction *openAction = fileMenu->addAction(tr("&Open..."), this, &MainWindow::openImage);
    openAction->setShortcuts(QKeySequence::Open);

    QAction *exitAction = fileMenu->addAction(tr("E&xit"), qApp, &QCoreApplication::quit);
    exitAction->setShortcuts(QKeySequence::Quit);

    QMenu *gameMenu = menuBar()->addMenu(tr("&Game"));

    gameMenu->addAction(tr("&Restart"), this, &MainWindow::setupPuzzle);
}

void MainWindow::setupWidgets()
{
    QFrame *frame = new QFrame;
    QHBoxLayout *frameLayout = new QHBoxLayout(frame);
    puzzleWidget = new PuzzleWidget(400);

    piecesList = new PiecesList(puzzleWidget->pieceSize(), this);


    connect(puzzleWidget, &PuzzleWidget::puzzleCompleted,
            this, &MainWindow::setCompleted, Qt::QueuedConnection);

    frameLayout->addWidget(piecesList);
    frameLayout->addWidget(puzzleWidget);
    setCentralWidget(frame);
}
