import type { fdOutgoingPosition } from '../fd';

export class Dimensions {
	public width : number;
	public height : number;

	constructor (width : number, height : number) {
		this.width = width;
		this.height = height;
	}

	public getRatio () : number {
		return this.width / this.height;
	}
}

interface Offset {
	x : number;
	y : number;
}

export class Display {

	private screen : Dimensions;
	private source : Dimensions;

	private display : Dimensions;
	private offset : Offset;

	constructor (width : number, height : number) {
		this.screen = new Dimensions(width, height);
		this.offset = { x: 0, y : 0 }
	}

	public setOffsetX (x : number) {
		this.offset.x = x;
	}

	public setOffsetY (y : number) {
		this.offset.y = y;
	}

	public setWidth (width : number) {
		this.display.width = width;
	}

	public setHeight (height : number) {
		this.display.height = height;
	}

	public setSource (width : number, height : number) {
		let offset : number;
		this.source = new Dimensions(width, height);
		if (this.source.getRatio() > this.screen.getRatio()) {
			this.display = new Dimensions(this.screen.width, Math.floor(this.source.width / this.source.getRatio()));
			offset = this.screen.height - this.display.height;
			this.offset = { x: 0,  y : Math.round(offset / 2) };
		} else {
			this.display = new Dimensions(Math.floor(this.source.getRatio() * this.screen.height), this.screen.height);
			offset = this.screen.width - this.display.width;
			this.offset = { x: Math.round(offset / 2),  y : 0 };
		}
	}

	public getOutgoingPosition () : fdOutgoingPosition {
		return {
			w : this.display.width,
			h : this.display.height,
			x : this.offset.x,
			y : this.offset.y
		}
	}

	public getDimensions () : Dimensions {
		return this.display;
	}

	public getOffset () : Offset {
		return this.offset;
	}

	public getScreen () : Dimensions {
		return this.screen;
	}

	public getSource () : Dimensions {
		return this.source;
	}
}

module.exports = { Display,  Dimensions };
export type { Offset };