/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
 *            canvastoolposition.cc
 *
 *  Sat Mar 25 11:45:34 CET 2023
 *  Copyright 2023 Bent Bisballe Nyeng
 *  deva@aasimon.org
 ****************************************************************************/

/*
 *  This file is part of DrumGizmo.
 *
 *  DrumGizmo 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.
 *
 *  DrumGizmo 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 DrumGizmo; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
 */
#include "canvastoolposition.h"

#include "project.h"
#include "canvas.h"
#include "range.h"

#include <iostream>

constexpr int diam{8};

#define mapX(x) canvas.mapX(x)
#define mapY(x) canvas.mapY(x)
#define unmapX(x) canvas.unmapX(x)
#define unmapY(x) canvas.unmapY(x)

CanvasToolPosition::CanvasToolPosition(Instrument& instrument,
                                       Canvas& canvas,
                                       Ranges& ranges,
                                       Ranges& ranges_preview)
	: instrument(instrument)
	, canvas(canvas)
	, ranges(ranges)
	, ranges_preview(ranges_preview)
{
	colSelBg = QColor(255, 0, 0, 60);
	colSel = QColor(255, 0, 0, 160);
	colActiveSelBg = QColor(255, 255, 0, 60);
	colActiveSel = QColor(255, 255, 0, 160);
	colPreviewSelBg = QColor(0, 0, 255, 60);
	colPreviewSel = QColor(0, 0, 255, 160);
}

bool CanvasToolPosition::mouseMoveEvent(QMouseEvent* event)
{
	sel_id_t active_range = ranges.active();
	Range act_sel = ranges.get(active_range);
//
//	int x1 = mapX(range.pos1);
//	int x2 = mapX(range.pos2);
//	highlight1 = false;
//	highlight2 = false;
//	if(x1 == event->x)
//	{
//		highlight1 = true;
//	}
//	else if(x2 == event->x)
//	{
//		highlight2 = true;
//	}
//	canvas->update();
//

	if(event->button() != Qt::LeftButton &&
	   event->y() > (canvas.height() - diam))
	{
		// Check if a range is being dragged.
		QVector<sel_id_t> ids = ranges.ids();
		QVector<sel_id_t>::iterator i = ids.begin();
		while(i != ids.end())
		{
			Range sel = ranges.get(*i);
			if(abs(event->x() - mapX(sel.pos1)) < diam/2
			   || abs(event->x() - mapX(sel.pos2)) < diam/2)
			{
				canvas.setCursor(Qt::SplitHCursor);
				return true;
			}
			i++;
		}
	}

	return false;
}

bool CanvasToolPosition::mousePressEvent(QMouseEvent* event)
{
	return false;
}

bool CanvasToolPosition::mouseReleaseEvent(QMouseEvent* event)
{
	return false;
}

namespace {
void drawRange(const Range& range, Canvas& canvas, QPainter& painter)
{
	int x1 = mapX(range.pos1);
	int x2 = mapX(range.pos2);
	if(x1 > x2)
	{
		std::swap(x1, x2);
	}

	//  x1     x2
	//  |      |
	//  |      |
	//  |<---->|
	//  |      |
	//  |      |
	constexpr auto len = 8;
	auto arrows_y = canvas.height() - canvas.height() / 8;
	auto balls_y = canvas.height() - diam;
	if(x1 > 0 && x1 < canvas.width())
	{
		painter.drawLine(x1, 0, x1, canvas.height()); // left bar
		painter.drawEllipse(x1-diam/2, balls_y, diam, diam);
	}
	if(((x1 > 0 && x1 < canvas.width()) || (x2 > 0 && x2 < canvas.width())) &&
	   std::abs(x1 - x2) > len)
	{
		painter.drawLine(x1, arrows_y, x1 + len, arrows_y + len); // left arrow
		painter.drawLine(x1, arrows_y, x1 + len, arrows_y - len); // left arrow
		painter.drawLine(x1, arrows_y, x2,       arrows_y); // horizontal line
		painter.drawLine(x2, arrows_y, x2 - len, arrows_y + len); // right arrow
		painter.drawLine(x2, arrows_y, x2 - len, arrows_y - len); // right arrow
	}
	if(x2 > 0 && x2 < canvas.width())
	{
		painter.drawLine(x2, 0, x2, canvas.height()); // right bar
		painter.drawEllipse(x2-diam/2, balls_y, diam, diam);
	}
}
}

void CanvasToolPosition::paintEvent(QPaintEvent* event, QPainter& painter)
{
	int pos = unmapX(event->rect().x());
	int width = unmapX(event->rect().width());

	{
		QVector<sel_id_t> ids = ranges.ids();
		QVector<sel_id_t>::iterator i = ids.begin();
		while(i != ids.end())
		{
			Range range = ranges.get(*i);

			if(ranges.active() == *i)
			{
				painter.setBrush(colActiveSelBg);
				painter.setPen(colActiveSel);
			}
			else
			{
				painter.setBrush(colSelBg);
				painter.setPen(colSel);
			}

			drawRange(range, canvas, painter);
			i++;
		}
	}

	if(show_preview)
	{
		QVector<sel_id_t> ids = ranges_preview.ids();
		QVector<sel_id_t>::iterator i = ids.begin();
		while(i != ids.end())
		{
			Range range = ranges.get(*i);
			painter.setBrush(colPreviewSelBg);
			painter.setPen(colPreviewSel);
			drawRange(range, canvas, painter);
			i++;
		}
	}
}

void CanvasToolPosition::keyReleaseEvent(QKeyEvent* event)
{
}

void CanvasToolPosition::rangesChanged()
{
	//auto ranges = instrument.getRanges();
	canvas.update();
}

void CanvasToolPosition::setShowPreview(bool show_preview)
{
	this->show_preview = show_preview;
	canvas.update();
}