/**
	1. FIXME: webpack doesn't alert calling undefined function

	2. If you are not strong with scss maps, take a look at
	{ @link https://www.sitepoint.com/extra-map-functions-sass/}
*/


/**
	Get value in SCSS $map
	@usage — padding-top: get($popup, padding-top);
 */
@function get($map, $name) {
	@if map-has-key($map, $name) {
		@return map-get($map, $name);
	} @else if ($name) {
		@warn "The key #{$name} is not in the map ’#{$map}’";
	}

	@return null;
};

/**
	Get value in nested SCSS $map
	@usage — map-deep-get($map, $level1, $level2)
 */
@function map-deep-get($map, $keys...) {
	@each $key in $keys {
		@if ($key) {
			$map: map-get($map, $key);
		} @else if ($key) {
			@warn "The key #{$key} is not in the map ’#{$map}’";
			@return null;
		}
	}
	@return $map;
}

/**
	Math.pow
 */
@function pow($number, $exp) {
	$value: 1;
	@if $exp > 0 {
		@for $i from 1 through $exp {
			$value: $value * $number;
		}
	}
	@else if $exp < 0 {
		@for $i from 1 through -$exp {
			$value: $value / $number;
		}
	}
	@return $value;
}

/**
	Factorial
 */
@function fact($number) {
	$value: 1;
	@if $number > 0 {
		@for $i from 1 through $number {
			$value: $value * $i;
		}
	}
	@return $value;
}

/**
	Math.PI
 */
@function pi() {
	@return 3.14159265359;
}

/**
	Get angle in radians
 */
@function rad($angle) {
	$unit: unit($angle);
	$unitless: $angle / ($angle * 0 + 1);
	// If the angle has 'deg' as unit, convert to radians.
	@if $unit == deg {
		$unitless: $unitless / 180 * pi();
	}
	@return $unitless;
}

/**
	Math.sin
 */
@function sin($angle) {
	$sin: 0;
	$angle: rad($angle);
	// Iterate a bunch of times.
	@for $i from 0 through 10 {
		$sin: $sin + pow(-1, $i) * pow($angle, (2 * $i + 1)) / fact(2 * $i + 1);
	}
	@return $sin;
}

/**
	Math.cos
 */
@function cos($angle) {
	$cos: 0;
	$angle: rad($angle);
	// Iterate a bunch of times.
	@for $i from 0 through 10 {
		$cos: $cos + pow(-1, $i) * pow($angle, 2 * $i) / fact(2 * $i);
	}
	@return $cos;
}

/**
	Math.tan
 */
@function tan($angle) {
	@return sin($angle) / cos($angle);
}

/**
	Random number in range
 */
@function randomNum($min, $max) {
	$rand: random();
	$randomNum: $min + floor($rand * (($max - $min) + 1));

	@return $randomNum;
}


/**
	Convert px to rem
	@usage — calculateRem(16px) => font-size: 1rem;
 */
@function calculateRem($size) {
	$remSize: $size / 16px; // 16px is a $base unit
	@return $remSize * 1rem;
}

/*
	Remove the unit of a number
	@param {Number} $number - Number to remove unit from
	@return {Number} - Unitless number
 */
@function strip-unit($number) {
	@if type-of($number) == 'number' and not unitless($number) {
		@return $number / ($number * 0 + 1);
	}

	@return $number;
}