/*
 * boarddelegate.cpp - Battleship game plugin
 * Copyright (C) 2014  Aleksey Andreev
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 */

#include "boarddelegate.h"

BoardDelegate::BoardDelegate(BoardModel *model, QObject *parent)
	: QItemDelegate(parent)
	, model_(model)
{
}

void BoardDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
	if (!index.isValid())
		return;
	QPoint point(index.column(), index.row());
	painter->save();
	painter->setRenderHint(QPainter::Antialiasing, true);
	painter->setRenderHint(QPainter::TextAntialiasing, true);
	painter->setRenderHint(QPainter::SmoothPixmapTransform, true);
	QRectF r(option.rect);
	int opos = model_->model2oppboard(point);
	int mpos = -1;
	if (opos == -1)
		mpos = model_->model2myboard(point);
	if (opos != -1 || mpos != -1)
	{
		GameBoard::CellStatus st;
		if (opos != -1)
			st = model_->gameModel()->oppBoard().cell(opos).status;
		else
			st = model_->gameModel()->myBoard().cell(mpos).status;
		if (st == GameBoard::CellOccupied || st == GameBoard::CellHit)
		{
			QRectF r2 = r.adjusted(1.0, 1.0, -1.0, -1.0);
			QPen pen(Qt::black);
			pen.setWidthF(2.0);
			pen.setJoinStyle(Qt::MiterJoin);
			painter->setPen(pen);
			painter->drawRect(r2);
			if (st == GameBoard::CellHit)
			{
				r2.adjust(1.0, 1.0, -1.0, -1.0);
				pen.setCapStyle(Qt::RoundCap);
				painter->drawLine(r2.topLeft(), r2.bottomRight());
				painter->drawLine(r2.topRight(), r2.bottomLeft());
			}
		}
		else
		{
			QRectF r2 = r.adjusted(0.5, 0.5, -0.5, -0.5);
			setGridPen(painter);
			painter->drawRect(r2);
			if (st == GameBoard::CellMiss || st == GameBoard::CellMargin)
			{
				qreal w = r.width() * 0.2;
				QPen pen(Qt::black);
				pen.setWidthF(w);
				pen.setCapStyle(Qt::RoundCap);
				painter->setPen(pen);
				painter->drawPoint(r.center());
			}
		}
	}
	else
	{
		// displaying coordinates
		if ((point.x() == 1 || point.x() == model_->columnCount() - 2)
				&& point.y() >= 2 && point.y() < model_->rowCount() - 2)
		{
			// Numbers
			QString text = QString::number(point.y() - 1);
			painter->drawText(r, Qt::AlignCenter, text, 0);
			QRectF r2 = r.adjusted(0.5, 0.5, -0.5, -0.5);
			setGridPen(painter);
			if (point.x() == 1)
				painter->drawLine(r2.topRight(), r2.bottomRight());
			else
				painter->drawLine(r2.topLeft(), r2.bottomLeft());
		}
		else if ((point.y() == 1 || point.y() == model_->rowCount() - 2)
			&& point.x() >= 2 && point.x() < model_->columnCount() - 2
			&& (point.x() <= 11 || point.x() >= 15))
		{
			// letters
			static const QString letters("ABCDEFGHJK");
			QString text;
			if (point.x() <= 11)
				text = letters.mid(point.x() - 2, 1);
			else
				text = letters.mid(point.x() - 15, 1);
			painter->drawText(r, Qt::AlignCenter, text, 0);
			QRectF r2 = r.adjusted(0.5, 0.5, -0.5, -0.5);
			setGridPen(painter);
			if (point.y() == 1)
				painter->drawLine(r2.bottomLeft(), r2.bottomRight());
			else
				painter->drawLine(r2.topLeft(), r2.topRight());
		}
	}
	painter->restore();
}

void BoardDelegate::setGridPen(QPainter *painter)
{
	QPen pen(Qt::blue);
	pen.setWidthF(0.5);
	pen.setJoinStyle(Qt::MiterJoin);
	pen.setCapStyle(Qt::SquareCap);
	painter->setPen(pen);
}
