/*Sphere's own tilemap engine is confusing so I wrote my own.
	This is a simplfied version of the script.
*/

const tilePath = "textures/tilesets/";

var tileset = function(source, width, height)
{
	this.path = tilePath + source;
	this.tile = {};
	this.tile.width = width;
	this.tile.height = height;

	this.Area = {};
	this.Area.width = Math.ceil(GetScreenWidth() / width);
	this.Area.height = Math.ceil(GetScreenHeight() / height);

	this.atlas = [];
};

tileset.prototype = {};

// Unpacks a tileset
tileset.prototype.unpack = function()
{
	// Begin unpacking the tileset.
	Print("Unpacking tilset \"" + this.path + "\"");
	var source = LoadImage(this.path);
	source.blit(0,0);
	var tile = 0;
	for (var y = 0; y < source.height / this.tile.height; y++)
	{
		for (var x = 0; x < source.width / this.tile.width; x++)
		{
			var cache = GrabSurface(
						x * this.tile.width,
						y * this.tile.height,
						this.tile.width,
						this.tile.height
						);

			var tilename = "tile_" + x + "-" + y;
			this.atlas.push([cache, tilename, 0]);

			tile += 1;

			Print("  Unpacked texture " + this.atlas.length + " - " + tilename);
		};
	};

	// Generate sample tile.
	Print("  Generating Test tile...");
	var cache = CreateSurface(
		this.tile.width,
		this.tile.height,
		CreateColor(0, 0, 0, 0)
		);

	var color = CreateColor(255, 125, 125);

	cache.line(0, 0, this.tile.width, 0, color);
	cache.line(this.tile.width - 1, 0, this.tile.width - 1, this.tile.height, color);
	cache.line(this.tile.width, this.tile.height - 1, 0, this.tile.height - 1, color);
	cache.line(0, this.tile.height - 1, 0, 0, color);

	this.atlas.unshift([cache, "tile_test", 0]);

	Print("    ...Done.");
	Print("Unpacking complete.");

	//Clear no-longer used memory :3
	GarbageCollect();
};

// Aligns a tile on the y axis.
tileset.prototype.align = function(id, val)
{
	this.atlas[id][2] = val;
};

// Blits a  tile to the screen.
tileset.prototype.blit = function(id, pX, pY)
{
	this.atlas[id][0].blit(pX * this.tile.width, pY * this.tile.height, 0.5);
};

// Gets the tileset width.
tileset.prototype.width = function()
{
	return this.tile.width;
};

// Gets the tileset height.
tileset.prototype.height = function()
{
	return this.tile.height;
};

// Gets the width of the renderable area.
tileset.prototype.spaceWidth = function()
{
	return this.Area.width;
}

// Gets the height of the renderable area.
tileset.prototype.spaceHeight = function()
{
	return this.Area.height;
}