import { InputHandler } from './inputhandler';

import { Listenable } from '../../util';

import { vec2 } from 'gl-matrix';

export enum ButtonCode {
	Action,
	Back,
	Menu,
}

const buttonMapping: {[key: string]: ButtonCode} = {
	KeyZ: ButtonCode.Action,
	KeyX: ButtonCode.Back,
	KeyC: ButtonCode.Menu,
};

export interface DirectionInput {
	type: 'direction';
	direction: vec2;
}

export interface ButtonInput {
	type: 'button';
	button: ButtonCode;
}

export type GameInput = DirectionInput | ButtonInput;

export class GameInputHandler extends Listenable<[GameInput]> {
	private readonly input: InputHandler;

	constructor() {
		super();

		this.input = new InputHandler(
			new Set([
				'ArrowLeft',
				'ArrowUp',
				'ArrowRight',
				'ArrowDown',
				...Object.keys(buttonMapping),
			]));

		this.input.addListener((key: string, pressed: boolean) => {
			const button = buttonMapping[key];
			if (button !== undefined) {
				if (pressed)
					this.runListeners({
						type: 'button',
						button,
					});

				return;
			}

			const dir = vec2.create();

			if (this.input.has('ArrowLeft'))
				vec2.add(dir, dir, [-1, 0]);
			if (this.input.has('ArrowUp'))
				vec2.add(dir, dir, [0, -1]);
			if (this.input.has('ArrowRight'))
				vec2.add(dir, dir, [1, 0]);
			if (this.input.has('ArrowDown'))
				vec2.add(dir, dir, [0, 1]);

			if (vec2.sqrLen(dir) > 0)
				vec2.normalize(dir, dir);

			this.runListeners({
				type: 'direction',
				direction: dir,
			});
		});
	}
}