//
// Universal Responsive media query.
//
// IMPORTANT:
// When using LibSass for SCSS compiling (with Prepros it's called "Node Sass"),
// double check if media queries with multiple list parameters passed to this
// mixin were processed correctly. If not, try not to use LibSass.
//
// @example
// 	@include media(
// 		1600,                     // -> 'and (min-width: 1600px)'
// 		1600px,                   // -> 'and (min-width: 1600px)'
// 		( 1600,   'min-height' ), // -> 'and (min-height: 1600px)'
// 		( 1600px, 'min-height' ), // -> 'and (min-height: 1600px)'
// 		( 1600,   'max-height' ), // -> 'and (max-height: 1599px)'
// 		( 1600px, 'max-height' ), // -> 'and (max-height: 1600px)'
// 	) {
// 		$content;
// 	}
//
// @since  1.0.0
//
// @param  lists $queries  Media query condition lists (arrays).
//
@mixin media( $queries... ) {

	$output : '';

	@each $query in $queries {
		@if (
			$query
			and (
				list == type-of( $query )
				or number == type-of( $query )
			)
		) {

			// Default query rule (the 2nd value in list) if not set otherwise

				@if ( 1 == length( $query ) ) {
					$query : append( $query, 'min-width' );
				}

			// Query value (the 1st value in list) in ems, or display it unchanged

				//
				// Query value must be set as SASS number, which can actually also contain a unit.
				// SASS string must be enclosed in parentheses, so never enclose the query value in those.
				//
				// @link  http://sass-lang.com/documentation/Sass/Script/Functions.html#unit-instance_method
				//
				$query_value : nth( $query, 1 );

				@if (
					number == type-of( $query_value )
					and '' == unit( $query_value )
				) {

					// If the query is `max`, deduct a single pixel from unit-less query value.
					// (We do not do this if the query value contains a unit!)
					@if ( str-index( nth( $query, 2 ), 'max' ) ) {
						$query_value : $query_value - 1;
					}

					$query_value : $query_value +px;

					$query : set-nth( $query, 1, $query_value );

				}

			// Add to output

				@if ( 0 < str-length( $output ) ) {
					$output : $output + ' and ';
				}
				$output : $output + '(' + nth( $query, 2 ) + ': ' + nth( $query, 1 ) + ')';

		}
	}

	@if ( 0 < str-length( $output ) ) {
		@media #{ $output } {
			@content
		}
	} @else {
		@content
	}

}