// Returns truthiness of a value
// -------------------------------------------------------------------------------
// @param $value [literal] : value
// -------------------------------------------------------------------------------
// @return [bool]

@function is-true($value) {
	@return if($value == null, false, $value and $value != null and $value != "" and $value != ());
}

// Checks if item is map
//--------------------------------------------------------------------------------
// @param $n [map] : value
// -------------------------------------------------------------------------------
// @return [bool]

@function is-map($n) {
	@return type-of($n) == "map";
}

// Checks if item is list
//--------------------------------------------------------------------------------
// @param $n [list] : value
// -------------------------------------------------------------------------------
// @return [bool]

@function is-list($n) {
	@return type-of($n) == "list";
}

// Checks if item is number
//--------------------------------------------------------------------------------
// @param $n [number] : value
// -------------------------------------------------------------------------------
// @return [bool]

@function is-number($n) {
	@return type-of($n) == "number";
}

// Checks if item is string
//--------------------------------------------------------------------------------
// @param $n [string] : value
// -------------------------------------------------------------------------------
// @return [bool]

@function is-string($n) {
	@return type-of($n) == "string";
}

// Checks if item is not string
//--------------------------------------------------------------------------------
// @param $n [string] : value
// -------------------------------------------------------------------------------
// @return [bool]

@function is-not-string($n) {
	@return type-of($n) != "string";
}

// Gets list of each breakpoint's key
// -------------------------------------------------------------------------------
// @return [list]

@function get-all-keys() {
	$all-keys: ();

	@for $i from 1 through (length(map-fetch($flint, "config")) - 1) {
		$key: steal-key($i);
		$all-keys: append($all-keys, $key, "comma");
	}

	@return $all-keys;
}

// Gets list of all breakpoints
// -------------------------------------------------------------------------------
// @return [list]

@function get-all-breakpoints() {
	$all-breakpoints: ();

	@each $map, $keys in map-get($flint, "config") {
		@each $key, $value in $keys {
			@if $key == "breakpoint" {
				$all-breakpoints: append($all-breakpoints, $value, "comma");
			}
		}
	}

	@return $all-breakpoints;
}

// Checks if passed $key is the highest breakpoint
// -------------------------------------------------------------------------------
// @dependence `get-value()`
// -------------------------------------------------------------------------------
// @param $key [string] : alias of breakpoint
// -------------------------------------------------------------------------------
// @return [bool]

@function is-highest-breakpoint($key) {
	@if get-value($key, "breakpoint") == max(get-all-breakpoints()...) {
		@return true;
	} @else {
		@return false;
	}
}

// Checks if passed $key is the lowest breakpoint
// -------------------------------------------------------------------------------
// @dependence `get-value()`
// -------------------------------------------------------------------------------
// @param $key [string] : alias of breakpoint
// -------------------------------------------------------------------------------
// @return [bool]

@function is-lowest-breakpoint($key) {
	@if get-value($key, "breakpoint") == min(get-all-breakpoints()...) {
		@return true;
	} @else {
		@return false;
	}
}

// Checks if $key is grid default
// -------------------------------------------------------------------------------
// @dependence `get-value()`
// -------------------------------------------------------------------------------
// @param $key [string] : alias of breakpoint
// -------------------------------------------------------------------------------
// @return [bool]

@function is-default($key) {
	@if $key == get-value("settings", "default") {
		@return true;
	} @else {
		@return false;
	}
}

// Gets all breakpoint column values
// -------------------------------------------------------------------------------
// @return [list]

@function get-all-columns() {
	$all-columns: ();

	@each $map, $keys in map-get($flint, "config") {
		@each $key, $value in $keys {
			@if $key == "columns" {
				$all-columns: append($all-columns, $value, "comma");
			}
		}
	}

	@return $all-columns;
}

// Returns the unit used in config
// -------------------------------------------------------------------------------
// @return [literal]

@function get-config-unit() {
	@return unit(get-value("settings", "gutter"));
}

// Convert pixel value to em
// -------------------------------------------------------------------------------
// @param $target [number] : pixel value
// @param $context [number] : context to divide by
// -------------------------------------------------------------------------------
// @return : em value of $target relative to $context
// -------------------------------------------------------------------------------

@function em($target, $context: $flint__base-font-size) {
	@return ($target / $context) * 1em;
}