/*!
 * V4Fire Client Core
 * https://github.com/V4Fire/Client
 *
 * Released under the MIT license
 * https://github.com/V4Fire/Client/blob/master/LICENSE
 */

/**
 * Global image cache
 */
$IMG = {}

/**
 * Loads an image by the specified URL and saves it to the global cache.
 * This function is useful to avoid the duplication of code when using CSS sprites.
 *
 * @param {string} $img
 * @param {boolean=} [$isDsAsset]
 *
 * @example
 * ```styl
 * .foo
 *   background-image img("assets/img/loader/spinner_size_l@3x.png")
 * ```
 */
img($img, $isDsAsset = false)
	$prop = current-property[0]
	$keys = {
		background: background-image
		background-image: background-image
		mask: mask-image
		mask-image: mask-image
	}

	// @stlint-disable

	if $isDsAsset
		$img = join("/", ds icons $img)

	//#if runtime.dynamicPublicPath
	return "url(%s)" % $img
	//#endif

	if !$IMG[$img]
		$IMG[$img] = {
			selectors: ()
			props: {}
		}

	$obj = $IMG[$img]
	$props = $obj.props

	// @stlint-enable

	push($obj.selectors, selector())
	$props[$keys[$prop]] = true

	return

/**
 * Generates registered image classes from the global cache.
 * Basically, this function is invoked automatically.
 */
generateImgClasses()
	for $img, $obj in $IMG
		$sel = join(",", $obj.selectors)

		{$sel}
			for $prop in $obj.props
				add-property($prop, "url(%s)" % $img)

	$IMG = {}