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#include <QtGui>

#include <stdlib.h>

#include "mainwindow.h"

#include "pieceslist.h"

#include "puzzlewidget.h"

MainWindow::MainWindow(QWidget *parent)

    : QMainWindow(parent)

{

    setupMenus();

    setupWidgets();

    setSizePolicy(QSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed));

    setWindowTitle(tr("Puzzle"));

}

void MainWindow::openImage(const QString &path)

{

    QString fileName = path;

    if (fileName.isNull())

        fileName = QFileDialog::getOpenFileName(this,

            tr("Open Image"), "", "Image Files (*.png *.jpg *.bmp)");

    if (!fileName.isEmpty()) {

        QPixmap newImage;

        if (!newImage.load(fileName)) {

            QMessageBox::warning(this, tr("Open Image"),

                                  tr("The image file could not be loaded."),

                                  QMessageBox::Cancel);

            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(400,

            400, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);

    piecesList->clear();

    for (int y = 0; y < 5; ++y) {

        for (int x = 0; x < 5; ++x) {

            QPixmap pieceImage = puzzleImage.copy(x*80, y*80, 80, 80);

            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..."));

    openAction->setShortcuts(QKeySequence::Open);

    QAction *exitAction = fileMenu->addAction(tr("E&xit"));

    exitAction->setShortcuts(QKeySequence::Quit);

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

    QAction *restartAction = gameMenu->addAction(tr("&Restart"));

    connect(openAction, SIGNAL(triggered()), this, SLOT(openImage()));

    connect(exitAction, SIGNAL(triggered()), qApp, SLOT(quit()));

    connect(restartAction, SIGNAL(triggered()), this, SLOT(setupPuzzle()));

}

void MainWindow::setupWidgets()

{

    QFrame *frame = new QFrame;

    QHBoxLayout *frameLayout = new QHBoxLayout(frame);

    piecesList = new PiecesList;

    puzzleWidget = new PuzzleWidget;

    connect(puzzleWidget, SIGNAL(puzzleCompleted()),

            this, SLOT(setCompleted()), Qt::QueuedConnection);

    frameLayout->addWidget(piecesList);

    frameLayout->addWidget(puzzleWidget);

    setCentralWidget(frame);

}