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#include <QtGui>

#include "window.h"

#include "movementtransition.h"

//![0]

Window::Window()

{

    pX = 5;

    pY = 5;

//![0]

    QFontDatabase database;

    QFont font;

    if (database.families().contains("Monospace"))

        font = QFont("Monospace", 12);

    else {

        foreach (QString family, database.families()) {

            if (database.isFixedPitch(family)) {

                font = QFont(family, 12);

                break;

            }

        }

    }

    setFont(font);

//![1]

    setupMap();

    buildMachine();

}

//![1]

void Window::setStatus(const QString &status)

{

    myStatus = status;

    repaint();

}

QString Window::status() const

{

    return myStatus;

}

void Window::paintEvent(QPaintEvent * /* event */)

{

    QFontMetrics metrics(font());

    QPainter painter(this);

    int fontHeight = metrics.height();

    int fontWidth = metrics.width('X');

    int yPos = fontHeight;

    int xPos;

    painter.fillRect(rect(), Qt::black);

    painter.setPen(Qt::white);

    painter.drawText(QPoint(0, yPos), status());

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

        yPos += fontHeight;

        xPos = 0;

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

            if (y == pY && x == pX) {

                xPos += fontWidth;

                continue;

            }

            painter.drawText(QPoint(xPos, yPos), map[x][y]);

            xPos += fontWidth;

        }

    }

    painter.drawText(QPoint(pX * fontWidth, (pY + 2) * fontHeight), QChar('@'));

}

QSize Window::sizeHint() const

{

    QFontMetrics metrics(font());

    return QSize(metrics.width('X') * WIDTH, metrics.height() * (HEIGHT + 1));

}

//![2]

void Window::buildMachine()

{

    machine = new QStateMachine;

    QState *inputState = new QState(machine);

    inputState->assignProperty(this, "status", "Move the rogue with 2, 4, 6, and 8");

    MovementTransition *transition = new MovementTransition(this);

    inputState->addTransition(transition);

//![2]

//![3]

    QState *quitState = new QState(machine);

    quitState->assignProperty(this, "status", "Really quit(y/n)?"); 

    QKeyEventTransition *yesTransition = new

        QKeyEventTransition(this, QEvent::KeyPress, Qt::Key_Y);

    yesTransition->setTargetState(new QFinalState(machine));

    quitState->addTransition(yesTransition);

    QKeyEventTransition *noTransition =

        new QKeyEventTransition(this, QEvent::KeyPress, Qt::Key_N);

    noTransition->setTargetState(inputState);

    quitState->addTransition(noTransition);

//![3]

//![4]

    QKeyEventTransition *quitTransition =

        new QKeyEventTransition(this, QEvent::KeyPress, Qt::Key_Q);

    quitTransition->setTargetState(quitState);

    inputState->addTransition(quitTransition);

//![4]

//![5]

    machine->setInitialState(inputState);

    connect(machine, SIGNAL(finished()), qApp, SLOT(quit()));

    machine->start();

}

//![5]

void Window::movePlayer(Direction direction)

{

    switch (direction) {

        case Left:

            if (map[pX - 1][pY] != '#')

                --pX;            

            break;

        case Right:

            if (map[pX + 1][pY] != '#')

                ++pX;

            break;

        case Up:

            if (map[pX][pY - 1] != '#')

                --pY;

            break;

        case Down:

            if (map[pX][pY + 1] != '#')

                ++pY;

            break;        

    }

    repaint();

}

void Window::setupMap()

{

    qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));

    for (int x = 0; x < WIDTH; ++x)

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

        if (x == 0 || x == WIDTH - 1 || y == 0 || y == HEIGHT - 1 || qrand() % 40 == 0)

            map[x][y] = '#';

        else

            map[x][y] = '.';

    }

}