import {Icon} from './Icon';
import {toPoint as point} from '../../geometry/Point';
import {empty} from '../../dom/DomUtil';

/*
 * @class DivIcon
 * @aka L.DivIcon
 * @inherits Icon
 *
 * Represents a lightweight icon for markers that uses a simple `<div>`
 * element instead of an image. Inherits from `Icon` but ignores the `iconUrl` and shadow options.
 *
 * @example
 * ```js
 * var myIcon = L.divIcon({className: 'my-div-icon'});
 * // you can set .my-div-icon styles in CSS
 *
 * L.marker([50.505, 30.57], {icon: myIcon}).addTo(map);
 * ```
 *
 * By default, it has a 'leaflet-div-icon' CSS class and is styled as a little white square with a shadow.
 */

export var DivIcon = Icon.extend({
	options: {
		// @section
		// @aka DivIcon options
		iconSize: [12, 12], // also can be set through CSS

		// iconAnchor: (Point),
		// popupAnchor: (Point),

		// @option html: String|HTMLElement = ''
		// Custom HTML code to put inside the div element, empty by default. Alternatively,
		// an instance of `HTMLElement`.
		html: false,

		// @option bgPos: Point = [0, 0]
		// Optional relative position of the background, in pixels
		bgPos: null,

		className: 'leaflet-div-icon'
	},

	createIcon: function (oldIcon) {
		var div = (oldIcon && oldIcon.tagName === 'DIV') ? oldIcon : document.createElement('div'),
		    options = this.options;

		if (options.html instanceof Element) {
			empty(div);
			div.appendChild(options.html);
		} else {
			div.innerHTML = options.html !== false ? options.html : '';
		}

		if (options.bgPos) {
			var bgPos = point(options.bgPos);
			div.style.backgroundPosition = (-bgPos.x) + 'px ' + (-bgPos.y) + 'px';
		}
		this._setIconStyles(div, 'icon');

		return div;
	},

	createShadow: function () {
		return null;
	}
});

// @factory L.divIcon(options: DivIcon options)
// Creates a `DivIcon` instance with the given options.
export function divIcon(options) {
	return new DivIcon(options);
}