with core, ui, effect, attribute, skill, resource, faction, might, magic, item, unit, construction, world, menu;

use menu;

package body menu is

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	draw_offset : constant integer := 16;
	icon_offset : constant integer := 4;
	icon_size   : constant integer := 32;
	offset      : constant integer := icon_size + 2 * icon_offset;

	button_width  : constant integer := offset + 24 * 8;
	button_height : constant integer := offset;

                                             ------------------------------------------------------------------------------------------

	function make_button (element_index : in integer; text : in core.short_string; icon : in core.sprite) return element is
	begin
		return (button, 0, text, icon, draw_offset, draw_offset + element_index * offset, button_width, button_height);
	end make_button;

                                             ------------------------------------------------------------------------------------------

	procedure configure is
	begin
		trait (attribute_information) := ("Attribute Information   ", true, attribute.count, 10, 100, 64, new element_array (0 .. attribute.count - 1));
		trait (skill_information)     := ("Skill Information       ", true, skill.count,     10, 700, 64, new element_array (0 .. skill.count     - 1));
		trait (resource_information)  := ("Resource Information    ", true, resource.count,  10, 400, 64, new element_array (0 .. resource.count  - 1));
		trait (none)                  := ("--                      ", true, 2,               10, 0,   0,  new element_array (0 ..                   1));
		--
		for index in 0 .. attribute.count - 1
		loop
			trait (attribute_information).elements (index) := make_button (index, attribute.name (index), attribute.icon (index));
		end loop;
		--
		for index in 0 .. skill.count - 1
		loop
			trait (skill_information).elements (index) := make_button (index, skill.name (index), skill.icon (index));
		end loop;
		--
		for index in 0 .. resource.count - 1
		loop
			trait (resource_information).elements (index) := make_button (index, resource.name (index), resource.icon (index));
		end loop;
		--
		for index in 0 .. 1
		loop
			trait (none).elements (index) := make_button (index, "--                      ", resource.icon (0));
		end loop;
	end configure;

                                             ------------------------------------------------------------------------------------------

	procedure synchronize is
		limitation : integer;
	begin
		mouse_over_menu         := none;
		mouse_over_menu_element := -1;
		--
		for index in codex
		loop
			if trait (index).hide then
				goto next;
			end if;
			limitation := (if trait (index).length < trait (index).height then trait (index).length else trait (index).height);
			--
			if  core.cursor_x > trait (index).x
			and core.cursor_x < trait (index).x + 2 * draw_offset + offset + 24 * 8
			and core.cursor_y > trait (index).y
			and core.cursor_y < trait (index).y + limitation * offset + 2 * draw_offset then
				mouse_over_menu := index;
			end if;
			--
			if mouse_over_menu /= none then
				for element_index in 0 .. limitation - 1
				loop
					if  core.cursor_x > trait (index).x + trait (index).elements (element_index).x
					and core.cursor_x < trait (index).x + trait (index).elements (element_index).x + trait (index).elements (element_index).width
					and core.cursor_y > trait (index).y + trait (index).elements (element_index).y
					and core.cursor_y < trait (index).y + trait (index).elements (element_index).y + trait (index).elements (element_index).height then
						mouse_over_menu_element := element_index;
					end if;
				end loop;
				return;
			end if;
			<<next>>
		end loop;
	end synchronize;

                                             ------------------------------------------------------------------------------------------

	procedure draw (index : in codex; x, y : in integer; center : in boolean) is
		scroll_bar  : constant boolean := (if trait (index).length > trait (index).height then true else false);
		limitation  : constant integer := (if scroll_bar then trait (index).height else trait (index).length);
		width       : constant integer := 2 * draw_offset + offset + 24 * 8;
		height      : constant integer := limitation * offset + 2 * draw_offset;
	begin
		if index = none then
			return;
		end if;
		--
		trait (index).hide := false;
		trait (index).x    := (if center then (core.window_width  - width)  / 2 else x);
		trait (index).y    := (if center then (core.window_height - height) / 2 else y);
		--
		ui.draw_title_bar (trait (index).x, trait (index).y, width, trait (index).title);
		ui.draw_tiny_menu (trait (index).x, trait (index).y, width, height, true);
		--
		for element_index in 0 .. limitation - 1
		loop
			ui.draw_frame (trait (index).x + draw_offset, trait (index).y + draw_offset + element_index * offset, width - 2 * draw_offset, offset);
			--
			core.draw  (trait (index).elements (element_index).icon, trait (index).x + draw_offset + icon_offset, trait (index).y + draw_offset +     icon_offset + element_index * offset);
			core.write (trait (index).elements (element_index).text, trait (index).x + draw_offset + offset,      trait (index).y + draw_offset + 2 * icon_offset + element_index * offset);
		end loop;
		--
		if scroll_bar then
			ui.draw_scroll_bar (trait (index).x + width - draw_offset, trait (index).y + draw_offset, height - 2 * draw_offset, 0);
		end if;
	end draw;

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end menu;