#include "labelslider.h"

#include "project/undo.h"
#include "panels/viewer.h"
#include "io/config.h"
#include "debug.h"

#include <QMouseEvent>
#include <QInputDialog>
#include <QApplication>

LabelSlider::LabelSlider(QWidget* parent) : QLabel(parent) {
	frame_rate = 30;
	decimal_places = 1;
	drag_start = false;
	drag_proc = false;
	min_enabled = false;
	max_enabled = false;
	set_color();
	setCursor(Qt::SizeHorCursor);
	internal_value = -1;
	set = false;
	display_type = LABELSLIDER_NORMAL;

	set_default_value(0);
}

void LabelSlider::set_frame_rate(double d) {
	frame_rate = d;
}

void LabelSlider::set_display_type(int type) {
	display_type = type;
	setText(valueToString(internal_value));
}

void LabelSlider::set_value(double v, bool userSet) {
	set = true;
	if (v != internal_value) {
		if (min_enabled && v < min_value) {
			internal_value = min_value;
		} else if (max_enabled && v > max_value) {
			internal_value = max_value;
		} else {
			internal_value = v;
		}

		setText(valueToString(internal_value));
		if (userSet) emit valueChanged();
	}
}

bool LabelSlider::is_set() {
	return set;
}

bool LabelSlider::is_dragging() {
	return drag_proc;
}

QString LabelSlider::valueToString(double v) {
	if (qIsNaN(v)) {
		return "---";
	} else {
		switch (display_type) {
		case LABELSLIDER_FRAMENUMBER: return frame_to_timecode(v, config.timecode_view, frame_rate);
		case LABELSLIDER_PERCENT: return QString::number((v*100), 'f', decimal_places) + "%";
		}
		return QString::number(v, 'f', decimal_places);
	}
}

double LabelSlider::getPreviousValue() {
	return previous_value;
}

void LabelSlider::set_previous_value() {
	previous_value = internal_value;
}

void LabelSlider::set_color(QString c) {
	if (c.isEmpty()) c = "#ffc000";
	setStyleSheet("QLabel{color:" + c + ";text-decoration:underline;}QLabel:disabled{color:#808080;}");
}

double LabelSlider::value() {
	return internal_value;
}

void LabelSlider::set_default_value(double v) {
	default_value = v;
	if (!set) {
		set_value(v, false);
		set = false;
	}
}

void LabelSlider::set_minimum_value(double v) {
	min_value = v;
	min_enabled = true;
}

void LabelSlider::set_maximum_value(double v) {
	max_value = v;
	max_enabled = true;
}

void LabelSlider::mousePressEvent(QMouseEvent *ev) {
	if (ev->buttons() & Qt::LeftButton) {
		drag_start_value = internal_value;
		if (ev->modifiers() & Qt::AltModifier) {
			if (internal_value != default_value && !qIsNaN(default_value)) {
				set_previous_value();
				set_value(default_value, true);
			}
		} else {
			if (qIsNaN(internal_value)) internal_value = 0;

			qApp->setOverrideCursor(Qt::BlankCursor);
			drag_start = true;
			drag_start_x = cursor().pos().x();
			drag_start_y = cursor().pos().y();
		}
		emit clicked();
	}
}

void LabelSlider::mouseMoveEvent(QMouseEvent* event) {
	if (drag_start) {
		drag_proc = true;
		double diff = (cursor().pos().x()-drag_start_x) + (drag_start_y-cursor().pos().y());
		if (event->modifiers() & Qt::ControlModifier) diff *= 0.01;
		if (display_type == LABELSLIDER_PERCENT) diff *= 0.01;
		set_value(internal_value + diff, true);
		cursor().setPos(drag_start_x, drag_start_y);
	}
}

void LabelSlider::mouseReleaseEvent(QMouseEvent*) {
	if (drag_start) {
		qApp->restoreOverrideCursor();
		drag_start = false;
		if (drag_proc) {
			drag_proc = false;
			previous_value = drag_start_value;
			emit valueChanged();
		} else {
			double d = internal_value;
			if (display_type == LABELSLIDER_FRAMENUMBER) {
				QString s = QInputDialog::getText(
							this,
							tr("Set Value"),
							tr("New value:"),
							QLineEdit::Normal,
							valueToString(internal_value)
						);
				if (s.isEmpty()) return;
				d = timecode_to_frame(s, config.timecode_view, frame_rate); // string to frame number
			} else {
				bool ok;
				d = QInputDialog::getDouble(
							this,
							tr("Set Value"),
							tr("New value:"),
							(display_type == LABELSLIDER_PERCENT) ? internal_value * 100 : internal_value,
							(min_enabled) ? min_value : INT_MIN,
							(max_enabled) ? max_value : INT_MAX,
							decimal_places,
							&ok
						);
				if (!ok) return;
				if (display_type == LABELSLIDER_PERCENT) d *= 0.01;
			}
			if (d != internal_value) {
				set_previous_value();
				set_value(d, true);
			}
		}
	}
}