-- Copyright (c) 2024 - Ognjen 'xolatile' Milan Robovic
--
-- GNU General Public Licence (version 3 or later)

with core, resource, item, unit, construction, world;

package body world is

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	type landmark_index is (
		dead_tree, mossy_rock, palm_tree, pine_tree, reeds, rock, snowed_pine_tree, snowed_rock, spiky_rock
	);

	type landmark_trait is record
		spawn  : biome;
		clip   : boolean;
		frames : integer;
	end record;

	type landmark_value is record
		index : landmark_index;
		x, y  : integer;
	end record;

	type tile_array     is array (natural range <>, natural range <>) of integer;
	type landmark_array is array (natural range <>)                   of landmark_value;

	type information is record
		kind      :        biome;
		width     :        natural;
		height    :        natural;
		tiles     : access tile_array;
		landmarks : access landmark_array;
	end record;

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

	map : information;

	tiles     :                           core.sprite;
	landmarks : array (landmark_index) of core.sprite;

	landmark_limit : constant integer := 40;

	trait : constant array (landmark_index) of landmark_trait := (
		dead_tree        => (ash,   true,  1),
		mossy_rock       => (swamp, true,  1),
		palm_tree        => (cave,  true,  4),
		pine_tree        => (grass, true,  4),
		reeds            => (swamp, false, 4),
		rock             => (cave,  true,  1),
		snowed_pine_tree => (snow,  true,  4),
		snowed_rock      => (snow,  true,  1),
		spiky_rock       => (ash,   true,  1)
	);

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

	procedure configure is
	begin
		core.echo (core.comment, "Configuring world components...");
		--
		tiles := core.import_sprite ("./sprite/world/terrain/terrain.png", 1, 1);
		--
		for index in landmark_index loop
			declare file : constant string := core.lowercase (index'image);
			begin
				landmarks (index) := core.import_sprite ("./sprite/world/landmark/" & file & ".png", trait (index).frames, 1);
			end;
		end loop;
	end configure;

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

	procedure make (index : in biome; width, height : in natural) is
	begin
		core.echo (core.comment, "-- Procedurally generating new map...");
		--
		core.echo (core.comment, "-- -- Map type           : " & index'image);
		core.echo (core.comment, "-- -- Map width          :"  & width'image);
		core.echo (core.comment, "-- -- Map height         :"  & height'image);
		core.echo (core.comment, "-- -- Landmark count     :"  & landmark_limit'image);
		--
		map.kind      := index;
		map.width     := width;
		map.height    := height;
		map.tiles     := new tile_array     (0 .. width - 1, 0 .. height - 1);
		map.landmarks := new landmark_array (1 .. landmark_limit);
		--
		for x in 0 .. width - 1 loop
			for y in 0 .. height - 1 loop
				map.tiles (x, y) := core.random (0, 23);
			end loop;
		end loop;
		--
		for index in 1 .. landmark_limit loop
			map.landmarks (index).index := landmark_index'val (core.random (0, 8));
			map.landmarks (index).x     := core.base * core.random (1, 90);
			map.landmarks (index).y     := core.base * core.random (1, 60);
		end loop;
		--
		core.echo (core.success, "Finished procedurally generating new map.");
	end make;

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

	procedure draw is
		u, v : integer;
	begin
		for move_y in 0 .. core.window_height / core.base / core.zoom + 1 loop
			for move_x in 0 .. core.window_width / core.base / core.zoom + 1 loop
				u := core.base * biome'pos (map.kind) * 4;
				v := core.base * map.tiles (core.camera.x + move_x, core.camera.y + move_y);
				--
				core.draw (tiles, (move_x - 1) * core.base * core.zoom, (move_y - 1) * core.base * core.zoom, u, v, core.base, core.base);
			end loop;
		end loop;
		--
		for index in 1 .. landmark_limit loop
			core.draw (data   => landmarks (map.landmarks (index).index),
			           x      => map.landmarks (index).x - core.camera.x * core.base,
			           y      => map.landmarks (index).y - core.camera.y * core.base);
		end loop;
	end draw;

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

	function width  return integer is begin return map.width;  end width;
	function height return integer is begin return map.height; end height;

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end world;