#include <gtk/gtk.h>
#include <cairo.h>
#include <stdbool.h>

static void draw_event(GtkDrawingArea *area, cairo_t *cr, int width, int height, gpointer data) {
	const double fieldSize = (double)(width < height ? width : height) / 8;
	const double xOffset = (width - fieldSize * 8) / 2;
	const double yOffset = (height - fieldSize * 8) / 2;
	for(int x = 0; x < 8; ++x) {
		for(int y = 0; y < 8; ++y) {
			cairo_rectangle(cr, xOffset +  x * fieldSize, yOffset + y * fieldSize, fieldSize, fieldSize);
			if((x + y) & 1) cairo_set_source_rgb(cr, 0.46274, 0.5882, 0.3373);
			else cairo_set_source_rgb(cr, 0.9333, 0.9333, 0.8235);
			cairo_fill(cr);
		}
	}
}

static void app_activate(GApplication *app, gpointer user_data) {
	GtkWindow *win;
	GtkWidget *drawArea;

	win = GTK_WINDOW(gtk_window_new());
	drawArea = gtk_drawing_area_new();
	gtk_window_set_child(win, drawArea);
	gtk_drawing_area_set_draw_func(GTK_DRAWING_AREA(drawArea), draw_event, NULL, NULL);
	gtk_window_set_application(win, GTK_APPLICATION(app));
	gtk_window_present(win);
}

int main(int argc, char **argv) {
	GtkApplication *app;
	int stat;

	app = gtk_application_new("org.zinkel.chess", G_APPLICATION_DEFAULT_FLAGS);
	g_signal_connect(app, "activate", G_CALLBACK (app_activate), NULL);
	stat = g_application_run(G_APPLICATION(app), argc, argv);
	g_object_unref (app);
	return stat;
}