/*
 * Breakpoint / Media Query Helper
 *
 * This mixin helps to create media queries based on a given query parameter.
 * Various syntaxes may be used for the query paramater.
 *
 * Logic:
 * 1) If the query is a number, assume a min-width media query by default
 * 2) If the query is a list ...
 *    2a) If the first list item is a string, assume a feature/value pair (i.e. max-width 500px)
 *    2b) If both values are numbers, assume a min-width/max-width pair
 * 3) If the query is a map, assume one or more feature/value pairs (i.e. max-width 500px, or min-width 300px and max-width 400px)
 *
 * Examples of Use:
 * @include bp(500px) {...}  =>  min-width: 500px
 * @include bp(min-width 500px) {...}  =>  min-width: 500px
 * @include bp(max-width 500px) {...}  =>  max-width: 500px
 * @include bp(500px 750px) {...}  =>  min-width: 500px, max-width: 750px
 * @include bp((min-width: 500px)) {...}  =>  min-width: 500px
 * @include bp((max-width: 500px)) {...}  =>  max-width: 500px
 * @include bp((min-width: 500px, max-width: 750px)) {...}  =>  max-width: 500px, max-width: 750px
 *
*/
@mixin bp($query) {
	// Analyze the type of query
	$qtype: type-of($query);
	// Query Type = Number
	@if $qtype == number {
		@media screen and (min-width: $query) {
			@content;
		}
	}
	// Query Type = List
	@else if $qtype == list {
		@if length($query) == 2 {
			// Feature/Value Pair (i.e. max-width 500px)
			@if (type-of(nth($query, 1)) == string) and (type-of(nth($query, 2)) == number) {
				@media screen and (nth($query, 1): nth($query, 2)) {
					@content;
				}
			}
			// Min-Width / Max-Width
			@if (type-of(nth($query, 1)) == number) and (type-of(nth($query, 2)) == number) {
				@media screen and (min-width: nth($query, 1)) and (max-width: nth($query, 2)) {
					@content;
				}
			}
		}
	}
	// Query Type = Map
	@else if $qtype == map {
		$mq: '';
		@each $key, $val in $query {
			$mq: $mq + "and (#{$key}: #{$val}) "
		}
		@media screen #{$mq} {
			@content;
		}
	}
}


/*
 * Font Conversion Helper
 *
 * This Mixin will conver pixels units to rems.
 *
 */
$pixelBase : 16;

@function parseInt($n) {
	@return $n / ($n * 0 + 1);
}

@function rem($values, $px-only: false){

	$list: ();

	@each $value in $values {

		$unit : unit($value);
		$val  : parseInt($value);

		// FOR IE, needing to return pixels
		@if ($px-only) and ($unit == 'rem') {
			$list: append($list, ($val * $pixelBase) + px);
		}

		// Return REMs for everyone else
		@else if($px-only == false) and ($unit == 'px'){
			$list: append($list, ($val / $pixelBase + rem));
		}

		@else if($unit == 'px') or ($unit == 'rem'){
			$list: append($list, $value);
		}

		@else {
			@warn 'There is no unit conversion for #{$unit}';
		}

	}

	@return $list(); /* 10 */

}