"use strict";

const xtend = require("xtend");
const nanoid = require("nanoid");
const immutable = require("immutable");

module.exports = function createWindowStore({onUpdated}) {
	let windows = immutable.OrderedMap([]);
	let activeWindow;
	let lastZIndex = 0;

	return {
		add: function (window_) {
			let id = nanoid();

			windows = windows.set(id, xtend(window_, {
				id: id,
				x: window_.initialX,
				y: window_.initialY,
				width: window_.initialWidth,
				height: window_.initialHeight
			}));

			this.focus(id);
			/* NOTE: We let .focus call onUpdated. QUESTION: Is this not deduplicated by React? */

			return id;
		},
		focus: function (id) {
			let targetWindow = windows.get(id);

			windows.forEach((window_) => {
				window_.isActive = false;
			});

			targetWindow.zIndex = lastZIndex++;
			targetWindow.isActive = true;
			activeWindow = targetWindow;

			onUpdated();
		},
		setPosition: function (id, x, y) {
			let targetWindow = windows.get(id);

			targetWindow.x = x;
			targetWindow.y = y;

			onUpdated();
		},
		setDimensions: function (id, width, height) {
			let targetWindow = windows.get(id);
			
			targetWindow.width = width;
			targetWindow.height = height;

			onUpdated();
		},
		close: function (id) {
			windows = windows.delete(id);
			onUpdated();
		},
		getAll: function () {
			return windows;
		},
		getActiveWindow: function () {
			return activeWindow;
		}
	};
};