#include "ruleritem.h"
#include "divetextitem.h"

#include <QFont>
#include <QFontMetrics>
#include <QPainter>
#include <QGraphicsScene>
#include <QGraphicsView>
#include <QDebug>

#include <stdint.h>

#include "profile.h"
#include "display.h"

RulerNodeItem2::RulerNodeItem2(struct plot_info &info) : pInfo(info), entry(NULL), ruler(NULL)
{
	setRect(QRect(QPoint(-8, 8), QPoint(8, -8)));
	setBrush(QColor(0xff, 0, 0, 127));
	setPen(QColor("#FF0000"));
	setFlag(QGraphicsItem::ItemIsMovable);
	setFlag(ItemSendsGeometryChanges);
	setFlag(ItemIgnoresTransformations);
}

void RulerNodeItem2::setRuler(RulerItem2 *r)
{
	ruler = r;
}

void RulerNodeItem2::recalculate()
{
	struct plot_data *data = pInfo.entry + (pInfo.nr - 1);
	uint16_t count = 0;
	if (x() < 0) {
		setPos(0, y());
	} else if (x() > timeAxis->posAtValue(data->sec)) {
		setPos(timeAxis->posAtValue(data->sec), y());
	} else {
		data = pInfo.entry;
		count = 0;
		while (timeAxis->posAtValue(data->sec) < x() && count < pInfo.nr) {
			data = pInfo.entry + count;
			count++;
		}
		setPos(timeAxis->posAtValue(data->sec), depthAxis->posAtValue(data->depth));
		entry = data;
	}
}

QVariant RulerNodeItem2::itemChange(GraphicsItemChange change, const QVariant &value)
{
	if (change == ItemPositionHasChanged) {
		recalculate();
		if (ruler != NULL)
			ruler->recalculate();
		if (scene()) {
			scene()->update();
		}
	}
	return QGraphicsEllipseItem::itemChange(change, value);
}

RulerItem2::RulerItem2() : timeAxis(NULL),
	depthAxis(NULL),
	source(new RulerNodeItem2(pInfo)),
	dest(new RulerNodeItem2(pInfo)),
	textItem(new QGraphicsSimpleTextItem(this))
{
	memset(&pInfo, 0, sizeof(pInfo));
	source->setRuler(this);
	dest->setRuler(this);
	textItem->setFlag(QGraphicsItem::ItemIgnoresTransformations);
}

void RulerItem2::recalculate()
{
	char buffer[500];
	QPointF tmp;
	QFont font;
	QFontMetrics fm(font);

	if (timeAxis == NULL || depthAxis == NULL || pInfo.nr == 0)
		return;

	prepareGeometryChange();
	startPoint = mapFromItem(source, 0, 0);
	endPoint = mapFromItem(dest, 0, 0);

	if (startPoint.x() > endPoint.x()) {
		tmp = endPoint;
		endPoint = startPoint;
		startPoint = tmp;
	}
	QLineF line(startPoint, endPoint);

	compare_samples(source->entry, dest->entry, buffer, 500, 1);
	text = QString(buffer);

	//Draw Text
	// This text item ignores transformations, so we cant use
	// the line.angle(), we need to calculate the angle based
	// on the view.

	QGraphicsView *view = scene()->views().first();
	QPoint begin = view->mapFromScene(mapToScene(startPoint));
	QPoint end = view->mapFromScene(mapToScene(endPoint));
	QLineF globalLine(begin, end);
	textItem->setText(text);
	textItem->resetMatrix();
	textItem->resetTransform();
	textItem->setPos(startPoint);
	textItem->rotate(globalLine.angle() * -1);
}

RulerNodeItem2 *RulerItem2::sourceNode() const
{
	return source;
}

RulerNodeItem2 *RulerItem2::destNode() const
{
	return dest;
}

void RulerItem2::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
	Q_UNUSED(option);
	Q_UNUSED(widget);
	QLineF line(startPoint, endPoint);
	painter->setPen(QColor(Qt::black));
	painter->setBrush(Qt::NoBrush);
	painter->drawLine(line);
}

QRectF RulerItem2::boundingRect() const
{
	return shape().controlPointRect();
}

QPainterPath RulerItem2::shape() const
{
	QPainterPath path;
	QLineF line(startPoint, endPoint);
	QLineF line_n = line.normalVector();
	line_n.setLength(height);
	if (paint_direction == 1)
		line_n.setAngle(line_n.angle() + 180);
	path.moveTo(startPoint);
	path.lineTo(line_n.p2());
	path.lineTo(line_n.p2() + QPointF(line.dx(), line.dy()));
	path.lineTo(endPoint);
	path.lineTo(startPoint);
	return path;
}

void RulerItem2::setPlotInfo(plot_info info)
{
	pInfo = info;
	recalculate();
	dest->recalculate();
	source->recalculate();
}

void RulerItem2::setAxis(DiveCartesianAxis *time, DiveCartesianAxis *depth)
{
	timeAxis = time;
	depthAxis = depth;
	dest->depthAxis = depth;
	dest->timeAxis = time;
	source->depthAxis = depth;
	source->timeAxis = time;
	recalculate();
}