import standard;
import node;

//consts
var ROOM_WIDTH: int const = 5;
var ROOM_HEIGHT: int const = 5;

var TILE_WIDTH: int const = 128;
var TILE_HEIGHT: int const = 128;

//vars
var tilemap: [[int]] = null;

//debug vars
var camX = 0;
var camY = 0;
var camW = 1080;
var camH = 720;



//lifecycle functions
fn onInit(node: opaque) {
	tilemap = generateBlankMap(ROOM_WIDTH, ROOM_HEIGHT);

	node.loadTexture("sprites:/tileset.png");
	node.setNodeRect(0, 0, 32, 32);

	//debug
	print tilemap;
	tilemap[1][1] = 1;
	print tilemap;
}

fn onDraw(node: opaque) {
	//calc the region to render
	var lowerX: int = round((camX - camW/2.0) / TILE_WIDTH);
	var upperX: int = round((camX - camW*1.5) / TILE_WIDTH);
	var lowerY: int = round((camY - camH/2.0) / TILE_HEIGHT);
	var upperY: int = round((camY - camH*1.5) / TILE_HEIGHT);

	//bounds check
	lowerX = max(0, lowerX);
	upperX = min(upperX < 0 ? abs(upperX) : 0, ROOM_WIDTH);
	lowerY = max(0, lowerY);
	upperY = min(upperY < 0 ? abs(upperY) : 0, ROOM_HEIGHT);


	//draw the tilemap
	for (var j = lowerY; j < upperY; j++) {
		for (var i = lowerX; i < upperX; i++) {
			node.setCurrentNodeFrame(tilemap[i][j]);
			node.drawNode(i * TILE_WIDTH, j * TILE_HEIGHT, TILE_WIDTH, TILE_HEIGHT);
		}
	}
}


//utils functions
fn generateBlankMap(width: int, height: int) {
	//generate the row template
	var row: [int] = [];
	for (var j: int = 0; j < height; j++) {
		row.push(0);
	}

	var result: [[int]] = [];
	//generate the game map proper
	for (var i: int = 0; i < width; i++) {
		result.push(row);
	}

	return result;
}