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#include <QtGui>

#include "tetrixboard.h"

//! [0]

TetrixBoard::TetrixBoard(QWidget *parent)

    : QFrame(parent)

{

    setFrameStyle(QFrame::Panel | QFrame::Sunken);

    setFocusPolicy(Qt::StrongFocus);

    isStarted = false;

    isPaused = false;

    clearBoard();

    nextPiece.setRandomShape();

}

//! [0]

//! [1]

void TetrixBoard::setNextPieceLabel(QLabel *label)

{

    nextPieceLabel = label;

}

//! [1]

//! [2]

QSize TetrixBoard::sizeHint() const

{

    return QSize(BoardWidth * 15 + frameWidth() * 2,

                 BoardHeight * 15 + frameWidth() * 2);

}

QSize TetrixBoard::minimumSizeHint() const

//! [2] //! [3]

{

    return QSize(BoardWidth * 5 + frameWidth() * 2,

                 BoardHeight * 5 + frameWidth() * 2);

}

//! [3]

//! [4]

void TetrixBoard::start()

{

    if (isPaused)

        return;

    isStarted = true;

    isWaitingAfterLine = false;

    numLinesRemoved = 0;

    numPiecesDropped = 0;

    score = 0;

    level = 1;

    clearBoard();

    emit linesRemovedChanged(numLinesRemoved);

    emit scoreChanged(score);

    emit levelChanged(level);

    newPiece();

    timer.start(timeoutTime(), this);

}

//! [4]

//! [5]

void TetrixBoard::pause()

{

    if (!isStarted)

        return;

    isPaused = !isPaused;

    if (isPaused) {

	timer.stop();

    } else {

	timer.start(timeoutTime(), this);

    }

    update();

//! [5] //! [6]

}

//! [6]

//! [7]

void TetrixBoard::paintEvent(QPaintEvent *event)

{

    QFrame::paintEvent(event);

    QPainter painter(this);

    QRect rect = contentsRect();

//! [7]

    if (isPaused) {

	painter.drawText(rect, Qt::AlignCenter, tr("Pause"));

        return;

    }

//! [8]

    int boardTop = rect.bottom() - BoardHeight*squareHeight();

    for (int i = 0; i < BoardHeight; ++i) {

        for (int j = 0; j < BoardWidth; ++j) {

            TetrixShape shape = shapeAt(j, BoardHeight - i - 1);

	    if (shape != NoShape)

                drawSquare(painter, rect.left() + j * squareWidth(),

                           boardTop + i * squareHeight(), shape);

        }

//! [8] //! [9]

    }

//! [9]

//! [10]

    if (curPiece.shape() != NoShape) {

        for (int i = 0; i < 4; ++i) {

            int x = curX + curPiece.x(i);

            int y = curY - curPiece.y(i);

            drawSquare(painter, rect.left() + x * squareWidth(),

                       boardTop + (BoardHeight - y - 1) * squareHeight(),

                       curPiece.shape());

        }

//! [10] //! [11]

    }

//! [11] //! [12]

}

//! [12]

//! [13]

void TetrixBoard::keyPressEvent(QKeyEvent *event)

{

    if (!isStarted || isPaused || curPiece.shape() == NoShape) {

	QFrame::keyPressEvent(event);

        return;

    }

//! [13]

//! [14]

    switch (event->key()) {

    case Qt::Key_Left:

        tryMove(curPiece, curX - 1, curY);

	break;

    case Qt::Key_Right:

        tryMove(curPiece, curX + 1, curY);

	break;

    case Qt::Key_Down:

        tryMove(curPiece.rotatedRight(), curX, curY);

	break;

    case Qt::Key_Up:

        tryMove(curPiece.rotatedLeft(), curX, curY);

	break;

    case Qt::Key_Space:

	dropDown();

	break;

    case Qt::Key_D:

	oneLineDown();

	break;

    default:

	QFrame::keyPressEvent(event);

    }

//! [14]

}

//! [15]

void TetrixBoard::timerEvent(QTimerEvent *event)

{

    if (event->timerId() == timer.timerId()) {

        if (isWaitingAfterLine) {

	    isWaitingAfterLine = false;

	    newPiece();

	    timer.start(timeoutTime(), this);

        } else {

            oneLineDown();

        }

    } else {

        QFrame::timerEvent(event);

//! [15] //! [16]

    }

//! [16] //! [17]

}

//! [17]

//! [18]

void TetrixBoard::clearBoard()

{

    for (int i = 0; i < BoardHeight * BoardWidth; ++i)

        board[i] = NoShape;

}

//! [18]

//! [19]

void TetrixBoard::dropDown()

{

    int dropHeight = 0;

    int newY = curY;

    while (newY > 0) {

        if (!tryMove(curPiece, curX, newY - 1))

            break;

        --newY;

        ++dropHeight;

    }

    pieceDropped(dropHeight);

//! [19] //! [20]

}

//! [20]

//! [21]

void TetrixBoard::oneLineDown()

{

    if (!tryMove(curPiece, curX, curY - 1))

	pieceDropped(0);

}

//! [21]

//! [22]

void TetrixBoard::pieceDropped(int dropHeight)

{

    for (int i = 0; i < 4; ++i) {

        int x = curX + curPiece.x(i);

        int y = curY - curPiece.y(i);

        shapeAt(x, y) = curPiece.shape();

    }

    ++numPiecesDropped;

    if (numPiecesDropped % 25 == 0) {

        ++level;

        timer.start(timeoutTime(), this);

        emit levelChanged(level);

    }

    score += dropHeight + 7;

    emit scoreChanged(score);

    removeFullLines();

    if (!isWaitingAfterLine)

        newPiece();

//! [22] //! [23]

}

//! [23]

//! [24]

void TetrixBoard::removeFullLines()

{

    int numFullLines = 0;

    for (int i = BoardHeight - 1; i >= 0; --i) {

        bool lineIsFull = true;

        for (int j = 0; j < BoardWidth; ++j) {

            if (shapeAt(j, i) == NoShape) {

                lineIsFull = false;

                break;

            }

        }

        if (lineIsFull) {

//! [24] //! [25]

	    ++numFullLines;

	    for (int k = i; k < BoardHeight - 1; ++k) {

                for (int j = 0; j < BoardWidth; ++j)

                    shapeAt(j, k) = shapeAt(j, k + 1);

	    }

//! [25] //! [26]

	    for (int j = 0; j < BoardWidth; ++j)

                shapeAt(j, BoardHeight - 1) = NoShape;

	}

//! [26] //! [27]

    }

//! [27]

//! [28]

    if (numFullLines > 0) {

	numLinesRemoved += numFullLines;

	score += 10 * numFullLines;

	emit linesRemovedChanged(numLinesRemoved);

        emit scoreChanged(score);

        timer.start(500, this);

        isWaitingAfterLine = true;

        curPiece.setShape(NoShape);

        update();

    }

//! [28] //! [29]

}

//! [29]

//! [30]

void TetrixBoard::newPiece()

{

    curPiece = nextPiece;

    nextPiece.setRandomShape();

    showNextPiece();

    curX = BoardWidth / 2 + 1;

    curY = BoardHeight - 1 + curPiece.minY();

    if (!tryMove(curPiece, curX, curY)) {

	curPiece.setShape(NoShape);

        timer.stop();

        isStarted = false;

    }

//! [30] //! [31]

}

//! [31]

//! [32]

void TetrixBoard::showNextPiece()

{

    if (!nextPieceLabel)

        return;

    int dx = nextPiece.maxX() - nextPiece.minX() + 1;

    int dy = nextPiece.maxY() - nextPiece.minY() + 1;

    QPixmap pixmap(dx * squareWidth(), dy * squareHeight());

    QPainter painter(&pixmap);

    painter.fillRect(pixmap.rect(), nextPieceLabel->palette().background());

    for (int i = 0; i < 4; ++i) {

        int x = nextPiece.x(i) - nextPiece.minX();

        int y = nextPiece.y(i) - nextPiece.minY();

        drawSquare(painter, x * squareWidth(), y * squareHeight(),

                   nextPiece.shape());

    }

    nextPieceLabel->setPixmap(pixmap);

//! [32] //! [33]

}

//! [33]

//! [34]

bool TetrixBoard::tryMove(const TetrixPiece &newPiece, int newX, int newY)

{

    for (int i = 0; i < 4; ++i) {

        int x = newX + newPiece.x(i);

        int y = newY - newPiece.y(i);

        if (x < 0 || x >= BoardWidth || y < 0 || y >= BoardHeight)

            return false;

        if (shapeAt(x, y) != NoShape)

            return false;

    }

//! [34]

//! [35]

    curPiece = newPiece;

    curX = newX;

    curY = newY;

    update();

    return true;

}

//! [35]

//! [36]

void TetrixBoard::drawSquare(QPainter &painter, int x, int y, TetrixShape shape)

{

    static const QRgb colorTable[8] = {

        0x000000, 0xCC6666, 0x66CC66, 0x6666CC,

        0xCCCC66, 0xCC66CC, 0x66CCCC, 0xDAAA00

    };

    QColor color = colorTable[int(shape)];

    painter.fillRect(x + 1, y + 1, squareWidth() - 2, squareHeight() - 2,

                     color);

    painter.setPen(color.light());

    painter.drawLine(x, y + squareHeight() - 1, x, y);

    painter.drawLine(x, y, x + squareWidth() - 1, y);

    painter.setPen(color.dark());

    painter.drawLine(x + 1, y + squareHeight() - 1,

                     x + squareWidth() - 1, y + squareHeight() - 1);

    painter.drawLine(x + squareWidth() - 1, y + squareHeight() - 1,

                     x + squareWidth() - 1, y + 1);

}

//! [36]