/// @description init
if !ready exit;
if palette == 0 exit;

#region dropper
	if(dropper_active) {
		if(mouse_check_button_pressed(mb_left)) {
			current_color  = dropper_color;
			dropper_active = false;	
			resetHSV();
			setColor();
		}
		
		if(mouse_check_button_pressed(mb_right)) {
			if(dropper_active == 2) instance_destroy();
		}
		
		var dx = mouse_mx + ui(36);
		var dy = mouse_my + ui(36);
		draw_sprite_stretched(s_color_picker_sample, 0, dx - ui(20), dy - ui(20), ui(40), ui(40));
		draw_sprite_stretched_ext(s_color_picker_sample, 0, dx - ui(18), dy - ui(18), ui(36), ui(36), dropper_color, 1);
		
		exit;
	}
#endregion

#region base UI
	var presets_x  = dialog_x;
	var presets_w  = ui(240);
	
	var content_x = dialog_x + presets_w + ui(16);
	var content_w = dialog_w - presets_w - ui(16);
	
	draw_sprite_stretched(s_dialog_bg, 0, presets_x, dialog_y, presets_w, dialog_h);
	if(sFOCUS) draw_sprite_stretched(s_dialog_active, 0, presets_x, dialog_y, presets_w, dialog_h);
	
	draw_sprite_stretched(s_dialog_bg, 0, content_x, dialog_y, content_w, dialog_h);
	if(sFOCUS) draw_sprite_stretched(s_dialog_active, 0, content_x, dialog_y, content_w, dialog_h);
	
	draw_set_text(f_p0, fa_left, fa_top, c_ui_blue_ltgrey);
	draw_text(presets_x + ui(24), dialog_y + ui(16), "Presets");
	draw_text(content_x + ui(24), dialog_y + ui(16), name);
#endregion

#region presets
	draw_sprite_stretched(s_ui_panel_bg, 0, presets_x + ui(16), dialog_y + ui(44), ui(240 - 32), dialog_h - ui(60));
	
	sp_presets.active = sFOCUS;
	sp_presets.draw(presets_x + ui(24), dialog_y + ui(44));
	
	var bx = presets_x + presets_w - ui(44);
	var by = dialog_y + ui(10);
	
	if(buttonInstant(s_button_hide, bx, by, ui(28), ui(28), mouse_ui, sFOCUS, sHOVER, "Save current palette to preset", s_add_24) == 2) {
		var dia = dialogCall(o_dialog_file_name, mouse_mx + ui(8), mouse_my + ui(8));
		dia.onModify = function (txt) {
			var file = file_text_open_write(txt + ".hex");
			for(var i = 0; i < array_length(palette); i++) {
				var cc = palette[i];
				var r  = number_to_hex(color_get_red(cc));
				var g  = number_to_hex(color_get_green(cc));
				var b  = number_to_hex(color_get_blue(cc));
				
				file_text_write_string(file, r + g + b);
				file_text_writeln(file);
			}
			file_text_close(file);
			presetCollect();
		};
		dia.path = DIRECTORY + "Palettes/"
	}
	bx -= ui(32);
	
	if(buttonInstant(s_button_hide, bx, by, ui(28), ui(28), mouse_ui, sFOCUS, sHOVER, "Refresh", s_refresh_16) == 2) {
		presetCollect();
	}
	draw_sprite_ui_uniform(s_refresh_16, 0, bx + ui(14), by + ui(14), 1, c_ui_blue_grey);
	bx -= ui(32);
	
	if(buttonInstant(s_button_hide, bx, by, ui(28), ui(28), mouse_ui, sFOCUS, sHOVER, "Open palette folder", s_folder_24) == 2) {
		var _realpath = environment_get_variable("LOCALAPPDATA") + "\\Pixels_Composer\\Palettes";
		var _windir   = environment_get_variable("WINDIR") + "\\explorer.exe";
		execute_shell(_windir, _realpath);
	}
	draw_sprite_ui_uniform(s_folder_24, 0, bx + ui(14), by + ui(14), 1, c_ui_blue_grey);
	bx -= ui(32);
#endregion

#region palette
	var pl_x = content_x + ui(60);
	var pl_y = dialog_y + ui(54);
	var pl_w = content_w - ui(154);
	var pl_h = ui(24);
	
	var max_col = 8;
	var col = min(array_length(palette), max_col);
	var row = ceil(array_length(palette) / col);
	var ww = pl_w / col;
	var hh = (pl_h + ui(6)) * row;
	dialog_h = ui(400) + hh;
	
	draw_sprite_stretched(s_textbox, 0, pl_x - ui(6), pl_y - ui(6), pl_w + ui(12), hh + ui(6));
	
	#region tools
		var bx = content_x + content_w - ui(50);
		var by = dialog_y + ui(16);
		
		if(buttonInstant(s_button_hide, bx, by, ui(28), ui(28), mouse_ui, sFOCUS, sHOVER, "Sort color", s_sort_24) == 2) {
			sortPalette();
		}
		
		bx -= ui(32);
	#endregion
	
	var hover = -1;
	for(var i = 0; i < row; i++)
	for(var j = 0; j < col; j++) {
		var index = i * col + j;
		if(index >= array_length(palette)) break;
		var _p  = palette[index];
		var _kx = pl_x + j * ww;
		var _ky = pl_y + i * (pl_h + ui(6));
		
		draw_sprite_stretched_ext(s_color_picker_sample, index == index_selecting, _kx + ui(2), _ky, ww - ui(4), pl_h, _p, 1);
		
		if(sHOVER && point_in_rectangle(mouse_mx, mouse_my, _kx, _ky, _kx + ww, _ky + pl_h)) {
			if(index_dragging > -1 && index_dragging != index) {
				draw_set_color(c_ui_blue_grey);
				draw_line_width(_kx - 1, _ky, _kx - 1, _ky + pl_h, 2);
			}
			
			hover = index;
		}
	}
	
	if(index_dragging > -1) {
		if(mouse_check_button_released(mb_left)) {
			if(hover > -1 && hover !=  index_dragging) {
				var tt = palette[index_dragging];
				
				array_delete(palette, index_dragging, 1);
				array_insert(palette, hover, tt);
				
				current_color = palette[index_selecting];
				resetHSV();
			}
			index_dragging = -1;	
		}
	}
	
	if(sFOCUS) {
		if(mouse_check_button_pressed(mb_left)) {
			if(hover > -1) {
				index_selecting = hover;
				index_dragging = hover;
				current_color = palette[hover];
				resetHSV();
			}
		}
	}
	
	var bx = content_x + content_w - ui(50);
	var by = pl_y - ui(2);
	
	if(array_length(palette) > 1) {
		if(buttonInstant(s_button, bx, by, ui(28), ui(28), mouse_ui, sFOCUS, sHOVER, "", s_minus_24) == 2) {
			array_resize(palette, array_length(palette) - 1);
		}
	} else {
		draw_sprite_ui_uniform(s_minus_24, 0, bx + ui(14), by + ui(14), 1, c_ui_blue_grey, 0.5);
	}
	
	bx -= ui(32);
	if(buttonInstant(s_button, bx, by, ui(28), ui(28), mouse_ui, sFOCUS, sHOVER, "", s_add_24) == 2) {
		palette[array_length(palette)] = c_black;
	}
	
	bx = content_x + ui(18);
	if(buttonInstant(s_button, bx, by, ui(28), ui(28), mouse_ui, sFOCUS, sHOVER, "Load palette file (.hex)", s_file) == 2) {
		var path = get_open_filename(".hex", "");
		if(path != "")
			palette = loadPalette(path);
	}
	draw_sprite_ui_uniform(s_file, 0, bx + ui(14), by + ui(14), 1, c_ui_blue_grey);
#endregion

#region color surface
	var col_x = content_x + ui(20);
	var col_y = dialog_y + ui(70) + hh;
	
	draw_sprite_stretched(s_ui_panel_bg, 0, col_x - ui(8), col_y - ui(8), ui(256 + 16), ui(256 + 16));
	
	if(!is_surface(color_surface)) color_surface = surface_create_valid(ui(256), ui(256));
	surface_set_target(color_surface);			
		draw_sprite_ext(s_fx_pixel, 0, 0, 0, ui(256), ui(256), 0, c_white, 1);
	surface_reset_target();
	
	shader_set(sh_color_picker);
		var h = shader_get_uniform(sh_color_picker, "hue");
		shader_set_uniform_f(h, hue / 256);
		
		draw_surface_safe(color_surface, col_x, col_y);
	shader_reset();
#endregion

#region selector
	var hue_x = content_x + ui(300);
	var hue_y = col_y;
	
	draw_sprite_stretched(s_ui_panel_bg, 0, hue_x - ui(8), hue_y - ui(8), ui(32), ui(256 + 16));
	
	for(var i = 0; i < 256; i++) {
		draw_set_color(make_color_hsv(i, 255, 255));
		draw_rectangle(hue_x, hue_y + ui(i), hue_x + ui(16), hue_y + ui(i + 1), false);
	}
		
	var hy = hue_y + ui(hue);
	draw_sprite_stretched_ext(s_ui_base_white, 0, hue_x - ui(3), hy - ui(6), ui(24), ui(10), make_color_hsv(hue, 255, 255), 1);
	draw_sprite_stretched_ext(s_ui_base_white, 0, col_x + ui(sat - 6), col_y + ui(256 - val - 6), ui(12), ui(12), current_color, 1);
	
	if(sFOCUS) {
		if(mouse_check_button_pressed(mb_left)) {
			if(point_in_rectangle(mouse_mx, mouse_my, hue_x, hue_y, hue_x + ui(16), hue_y + ui(256))) {
				hue_dragging = true;
			} else if(point_in_rectangle(mouse_mx, mouse_my, col_x, col_y, col_x + ui(256), col_y + ui(256))) {
				value_draggin = true;
			}
		}
	}
	
	if(hue_dragging) {
		hue = clamp((mouse_my - hue_y) / UI_SCALE, 0, 256);
		setHSV();
			
		if(mouse_check_button_released(mb_left))
			hue_dragging  = false;
	}
	
	if(value_draggin) {
		sat     = clamp((mouse_mx - col_x) / UI_SCALE, 0, 256);
		val     = 256 - clamp((mouse_my - col_y) / UI_SCALE, 0, 256);
		setHSV();
			
		if(mouse_check_button_released(mb_left))
			value_draggin  = false;
	}
#endregion

#region data
	var data_x = hue_x + ui(40);
	var data_y = col_y;
	
	draw_set_text(f_p1, fa_left, fa_center, c_white);
	draw_text(data_x, data_y + ui(40 * 0 + 17), "Hue");
	draw_text(data_x, data_y + ui(40 * 1 + 17), "Saturation")
	draw_text(data_x, data_y + ui(40 * 2 + 17), "Value");
	
	tb_hue.active = sFOCUS; tb_hue.hover = sHOVER;
	tb_sat.active = sFOCUS; tb_sat.hover = sHOVER;
	tb_val.active = sFOCUS; tb_val.hover = sHOVER;
	
	tb_hue.draw(data_x + ui(80), data_y + ui(44 * 0), ui(100), TEXTBOX_HEIGHT, round(color_get_hue(current_color)),			mouse_ui);
	tb_sat.draw(data_x + ui(80), data_y + ui(44 * 1), ui(100), TEXTBOX_HEIGHT, round(color_get_saturation(current_color)),	mouse_ui);
	tb_val.draw(data_x + ui(80), data_y + ui(44 * 2), ui(100), TEXTBOX_HEIGHT, round(color_get_value(current_color)),		mouse_ui);
	
	data_y = data_y + ui(44 * 3 + 8);
	
	draw_set_text(f_p1, fa_left, fa_center, c_white);
	draw_text(data_x, data_y + ui(40 * 0 + 17), "Red");
	draw_text(data_x, data_y + ui(40 * 1 + 17), "Green");
	draw_text(data_x, data_y + ui(40 * 2 + 17), "Blue");
	
	tb_red.active   = sFOCUS; tb_red.hover   = sHOVER;
	tb_green.active = sFOCUS; tb_green.hover = sHOVER;
	tb_blue.active  = sFOCUS; tb_blue.hover  = sHOVER;
	
	tb_red.draw  (data_x + ui(80), data_y + ui(44 * 0), ui(100), TEXTBOX_HEIGHT, color_get_red(current_color),   mouse_ui);
	tb_green.draw(data_x + ui(80), data_y + ui(44 * 1), ui(100), TEXTBOX_HEIGHT, color_get_green(current_color), mouse_ui);
	tb_blue.draw (data_x + ui(80), data_y + ui(44 * 2), ui(100), TEXTBOX_HEIGHT, color_get_blue(current_color),  mouse_ui);
	
	tb_hex.active  = sFOCUS;  tb_hex.hover  = sHOVER;

	tb_hex.draw(hue_x - ui(128), data_y + ui(44 * 3), ui(108), TEXTBOX_HEIGHT, color_get_hex(current_color),  mouse_ui);
#endregion

#region controls
	var cx = content_x + ui(36);
	var cy = dialog_y + dialog_h - ui(36);
	
	draw_sprite_stretched(s_color_picker_sample, 0, cx - ui(20), cy - ui(20), ui(40), ui(40));
	draw_sprite_stretched_ext(s_color_picker_sample, 0, cx - ui(18), cy - ui(18), ui(36), ui(36), current_color, 1);
	
	var bx = content_x + content_w - ui(36);
	var by = dialog_y + dialog_h - ui(36);
	if(buttonInstant(s_button_lime, bx - ui(18), by - ui(18), ui(36), ui(36), mouse_ui, sFOCUS, sHOVER, "", s_icon_accept_24, 0, c_ui_blue_black) == 2) {
		onApply(palette);
		instance_destroy();
	}
	
	var bx = content_x + ui(80);
	var by = dialog_y + dialog_h - ui(36);
	if(buttonInstant(s_button_hide, bx - ui(18), by - ui(18), ui(36), ui(36), mouse_ui, sFOCUS, sHOVER, "", s_color_picker_dropper, 0, c_white) == 2) {
		dropper_active = true;
	}
#endregion