class Drawer
{
	#canvasWidth
	#canvasHeight
	
	constructor(_padding)
	{
		this.padding = _padding;
		
		createCanvas(0, 0);
	}
	
	setTubesParams(_tubesNumbers, _tubeLevels, _tubeSize)
	{
		this.tubesNumbers = _tubesNumbers;
		this.tubeLevels = _tubeLevels;
		this.tubeSize = _tubeSize;
		
		this.#canvasWidth = this.tubesNumbers * (this.tubeSize + this.padding) + this.padding;
		this.#canvasHeight = 3 * this.padding + this.tubeLevels * this.tubeSize;
		
		resizeCanvas(this.#canvasWidth, this.#canvasHeight);
	}
	
	draw(game)
	{
		let tubes = game.tubes;
		let selectedTube = game.selectedTube;
		
		background('white');
		
		this.drawTubes(this.padding, 2*this.padding, tubes, selectedTube);
	}

	drawTubes(x, y, tubes, selectedTube)
	{
		let tubeX = x;
		let tubeY = y;
		let selectionOffset = 0;
		
		tubes.forEach(tube => {
			selectionOffset = (tube == selectedTube ? this.padding : 0);
			
			this.drawTube(tubeX, tubeY - selectionOffset, tube);
			tubeX += this.padding + this.tubeSize;
		});
	}

	drawTube(x, y, tube)
	{
		
		y += (this.tubeLevels-1) * this.tubeSize;
		
		for(let i = 0; i < this.tubeLevels; i++)
		{
			color = tube.getColorAtLevel(i);
			color == null ? noFill() : fill(color);
			
			if (i >= 0)
			{
				rect(x, y - i * this.tubeSize, this.tubeSize);
			}
		}
	}
	
	getTubeIdAt(x, y)
	{
		if (!this.isInboundsCanvas(x,y)) return -1;
		
		let idWithPadding = (x - this.padding) / (this.tubeSize + this.padding);
		return idWithPadding % 1 > 1 - (this.padding / (this.tubeSize + this.padding)) ? -1 : int(idWithPadding);
	}
	
	isInboundsCanvas(x, y)
	{
		return x >= this.padding
			&& y >= this.padding
			&& x < this.#canvasWidth - this.padding
			&& y < this.#canvasHeight - this.padding;
	}
}