//
// Variables
//

$start: left;
$end: right;

@if ($direction == rtl) {
	$start: right;
	$end: left;
}

//
// Internal Mixins
//

@mixin _dimension($dimension, $top, $right, $bottom, $left){

	@if ($direction == rtl) {
		#{$dimension}: $top $left $bottom $right;
	} @else {
		#{$dimension}: $top $right $bottom $left;
	}
}

@mixin _dimension_side($dimension, $side, $value) {

	@if ($direction == rtl and $side == start) or ($direction == ltr and $side == end) {
		#{$dimension}-right: $value;
	} @else {
		#{$dimension}-left: $value;
	}
}

@mixin _dimension_side_property($dimension, $side, $property, $value) {

	@if ($direction == rtl and $side == start) or ($direction == ltr and $side == end) {
		#{$dimension}-right-#{$property}: $value;
	} @else {
		#{$dimension}-left-#{$property}: $value;
	}
}

//
// Mixins
//

@mixin start($value) {

	@if $direction == rtl {
		right: $value;
	} @else {
		left: $value;
	}
}

@mixin end($value) {

	@if $direction == rtl {
		left: $value;
	} @else {
		right: $value;
	}
}

// Padding Mixins

@mixin padding($top, $right, $bottom, $left) {

	@include _dimension(padding, $top, $right, $bottom, $left);
}

@mixin padding-start($value) {

	@include _dimension_side(padding, start, $value);
}

@mixin padding-end($value) {

	@include _dimension_side(padding, end, $value);
}

// Margin Mixins

@mixin margin($top, $right, $bottom, $left) {

	@include _dimension(margin, $top, $right, $bottom, $left);
}

@mixin margin-start($value) {

	@include _dimension_side(margin, start, $value);
}

@mixin margin-end($value) {

	@include _dimension_side(margin, end, $value);
}

// Border Mixins

@mixin border-width($top, $right, $bottom, $left) {

	@include _dimension(border-width, $top, $right, $bottom, $left);
}

@mixin border-start($value) {

	@include _dimension_side(border, start, $value);
}

@mixin border-end($value) {

	@include _dimension_side(border, end, $value);
}

@mixin border-start-property($property, $value){

	@include _dimension_side_property(border, start, $property, $value);
}

@mixin border-end-property($property, $value){

	@include _dimension_side_property(border, end, $property, $value);
}

// Box-Shadow Mixins

@mixin direction-box-shadow($x, $extra-values) {

	@if $direction == rtl {
		$x: -$x;
	}

	box-shadow: $x $extra-values;
}

//
// Functions
//

@function getValueByDirection($value-for-left, $value-for-right) {

	@if ($direction == rtl) {
		@return $value-for-right;
	}

	@return $value-for-left;
}

@function getInverseDirection() {

	@if ($direction == rtl) {
		@return ltr;
	}

	@return rtl;
}