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#include <QtGui>

#include "tictactoe.h"

TicTacToe::TicTacToe(QWidget *parent)

    : QWidget(parent)

{

}

QSize TicTacToe::minimumSizeHint() const

{

    return QSize(200, 200);

}

QSize TicTacToe::sizeHint() const

{

    return QSize(200, 200);

}

void TicTacToe::setState(const QString &newState)

{

    turnNumber = 0;

    myState = "---------";

    int position = 0;

    while (position < 9 && position < newState.length()) {

        QChar mark = newState.at(position);

        if (mark == Cross || mark == Nought) {

            ++turnNumber;

            myState.replace(position, 1, mark);

        }

        position++;

    }

    update();

}

QString TicTacToe::state() const

{

    return myState;

}

void TicTacToe::clearBoard()

{

    myState = "---------";

    turnNumber = 0;

    update();

}

void TicTacToe::mousePressEvent(QMouseEvent *event)

{

    if (turnNumber == 9) {

        clearBoard();

        update();

    } else {

        for (int position = 0; position < 9; ++position) {

            QRect cell = cellRect(position / 3, position % 3);

            if (cell.contains(event->pos())) {

                if (myState.at(position) == Empty) {

                    if (turnNumber % 2 == 0)

                        myState.replace(position, 1, Cross);

                    else

                        myState.replace(position, 1, Nought);

                    ++turnNumber;

                    update();

                }

            }

        }

    }

}

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

{

    QPainter painter(this);

    painter.setRenderHint(QPainter::Antialiasing);

    painter.setPen(QPen(Qt::darkGreen, 1));

    painter.drawLine(cellWidth(), 0, cellWidth(), height());

    painter.drawLine(2 * cellWidth(), 0, 2 * cellWidth(), height());

    painter.drawLine(0, cellHeight(), width(), cellHeight());

    painter.drawLine(0, 2 * cellHeight(), width(), 2 * cellHeight());

    painter.setPen(QPen(Qt::darkBlue, 2));

    for (int position = 0; position < 9; ++position) {

        QRect cell = cellRect(position / 3, position % 3);

        if (myState.at(position) == Cross) {

            painter.drawLine(cell.topLeft(), cell.bottomRight());

            painter.drawLine(cell.topRight(), cell.bottomLeft());

        } else if (myState.at(position) == Nought) {

            painter.drawEllipse(cell);

        }

    }

    painter.setPen(QPen(Qt::yellow, 3));

    for (int position = 0; position < 9; position = position + 3) {

        if (myState.at(position) != Empty

                && myState.at(position + 1) == myState.at(position)

                && myState.at(position + 2) == myState.at(position)) {

            int y = cellRect((position / 3), 0).center().y();

            painter.drawLine(0, y, width(), y);

            turnNumber = 9;

        }

    }

    for (int position = 0; position < 3; ++position) {

        if (myState.at(position) != Empty

                && myState.at(position + 3) == myState.at(position)

                && myState.at(position + 6) == myState.at(position)) {

            int x = cellRect(0, position).center().x();

            painter.drawLine(x, 0, x, height());

            turnNumber = 9;

        }

    }

    if (myState.at(0) != Empty && myState.at(4) == myState.at(0)

            && myState.at(8) == myState.at(0)) {

        painter.drawLine(0, 0, width(), height());

        turnNumber = 9;

    }

    if (myState.at(2) != Empty && myState.at(4) == myState.at(2)

            && myState.at(6) == myState.at(2)) {

        painter.drawLine(0, height(), width(), 0);

        turnNumber = 9;

    }

}

QRect TicTacToe::cellRect(int row, int column) const

{

    const int HMargin = width() / 30;

    const int VMargin = height() / 30;

    return QRect(column * cellWidth() + HMargin,

                 row * cellHeight() + VMargin,

                 cellWidth() - 2 * HMargin,

                 cellHeight() - 2 * VMargin);

}