#include "FillTransparencyDialog.h"

FillTransparencyDialog::FillTransparencyDialog(GladeSearchpath* gladeSearchPath, int alpha)
 : GladeGui(gladeSearchPath, "fillTransparency.glade", "fillTransparencyDialog"),
   resultAlpha(-1)
{
	XOJ_INIT_TYPE(FillTransparencyDialog);

	GtkWidget* scaleAlpha = get("scaleAlpha");

	gtk_range_set_value(GTK_RANGE(scaleAlpha), alpha / 255.0 * 100);

	setPreviewImage(alpha);

	g_signal_connect(scaleAlpha, "change-value", G_CALLBACK(
		+[](GtkRange* range, GtkScrollType scroll, gdouble value, FillTransparencyDialog* self)
		{
			XOJ_CHECK_TYPE_OBJ(self, FillTransparencyDialog);
			self->setPreviewImage((int)(value / 100 * 255));
		}), this);
}

FillTransparencyDialog::~FillTransparencyDialog()
{
	XOJ_RELEASE_TYPE(FillTransparencyDialog);
}

const int PREVIEW_WIDTH = 70;
const int PREVIEW_HEIGTH = 50;
const int PREVIEW_BORDER = 10;

void FillTransparencyDialog::setPreviewImage(int alpha)
{
	cairo_surface_t* surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, PREVIEW_WIDTH, PREVIEW_HEIGTH);
	cairo_t* cr = cairo_create(surface);

	cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
	cairo_set_source_rgb(cr, 255, 255, 255);
	cairo_rectangle(cr, 0, 0, PREVIEW_WIDTH, PREVIEW_WIDTH);
	cairo_fill(cr);

	cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
	cairo_set_source_rgba(cr, 0, 0x80 / 255.0, 0, alpha / 255.0);
	cairo_rectangle(cr, PREVIEW_BORDER, PREVIEW_BORDER, PREVIEW_WIDTH - PREVIEW_BORDER * 2, PREVIEW_HEIGTH - PREVIEW_BORDER * 2);
	cairo_fill(cr);

	cairo_set_line_width(cr, 5);
	cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
	cairo_set_source_rgb(cr, 0, 0x80 / 255.0, 0);
	cairo_rectangle(cr, PREVIEW_BORDER, PREVIEW_BORDER, PREVIEW_WIDTH - PREVIEW_BORDER * 2, PREVIEW_HEIGTH - PREVIEW_BORDER * 2);
	cairo_stroke(cr);

	cairo_destroy(cr);

	GtkWidget* preview = get("imgPreview");
	gtk_image_set_from_surface(GTK_IMAGE(preview), surface);
}

int FillTransparencyDialog::getResultAlpha()
{
	XOJ_CHECK_TYPE(FillTransparencyDialog);

	return resultAlpha;
}

void FillTransparencyDialog::show(GtkWindow* parent)
{
	XOJ_CHECK_TYPE(FillTransparencyDialog);

	gtk_window_set_transient_for(GTK_WINDOW(this->window), parent);
	int result = gtk_dialog_run(GTK_DIALOG(this->window));
	gtk_widget_hide(this->window);

	// OK Button
	if (result == 1)
	{

		GtkWidget* scaleAlpha = get("scaleAlpha");
		resultAlpha = gtk_range_get_value(GTK_RANGE(scaleAlpha));
	}
	else
	{
		resultAlpha = -1;
	}
}