//------------------------------------------------------------------------------
// @tool: Shadows
//------------------------------------------------------------------------------
// @author: hanakin -- midaym
// @version: 1.1.0
// @description
//
// Mixin for generating Google Material Design shadows
//
//------------------------------------------------------------------------------

//
// @settings
$shadow-color: $black;
$shadow-umbra-opacity: 0.2 !default;
$shadow-penumbra-opacity: 0.14 !default;
$shadow-ambient-opacity: 0.12 !default;

// The css property used for elevation. In most cases this should not be changed. It is exposed
// as a variable for abstraction for easy use when needing to reference the property directly, for
// example in a `will-change` rule.
$shadow-elevation-property: box-shadow !default;

// The default duration value for elevation transitions.
$shadow-duration: 280ms !default;

// The default easing value for elevation transitions.
$shadow-easing: cubic-bezier(0.4, 0, 0.2, 1) !default;

$shadow-umbra-elevation: (
	0: '0px 0px 0px 0px',
	1: '0px 2px 1px -1px',
	2: '0px 3px 1px -2px',
	3: '0px 3px 3px -2px',
	4: '0px 2px 4px -1px',
	5: '0px 3px 5px -1px',
	6: '0px 3px 5px -1px',
	7: '0px 4px 5px -2px',
	8: '0px 5px 5px -3px',
	9: '0px 5px 6px -3px',
	10: '0px 6px 6px -3px',
	11: '0px 6px 7px -4px',
	12: '0px 7px 8px -4px',
	13: '0px 7px 8px -4px',
	14: '0px 7px 9px -4px',
	15: '0px 8px 9px -5px',
	16: '0px 8px 10px -5px',
	17: '0px 8px 11px -5px',
	18: '0px 9px 11px -5px',
	19: '0px 9px 12px -6px',
	20: '0px 10px 13px -6px',
	21: '0px 10px 13px -6px',
	22: '0px 10px 14px -6px',
	23: '0px 11px 14px -7px',
	24: '0px 11px 15px -7px'
);

$shadow-penumbra-elevation: (
	0: '0px 0px 0px 0px',
	1: '0px 1px 1px 0px',
	2: '0px 2px 2px 0px',
	3: '0px 3px 4px 0px',
	4: '0px 4px 5px 0px',
	5: '0px 5px 8px 0px',
	6: '0px 6px 10px 0px',
	7: '0px 7px 10px 1px',
	8: '0px 8px 10px 1px',
	9: '0px 9px 12px 1px',
	10: '0px 10px 14px 1px',
	11: '0px 11px 15px 1px',
	12: '0px 12px 17px 2px',
	13: '0px 13px 19px 2px',
	14: '0px 14px 21px 2px',
	15: '0px 15px 22px 2px',
	16: '0px 16px 24px 2px',
	17: '0px 17px 26px 2px',
	18: '0px 18px 28px 2px',
	19: '0px 19px 29px 2px',
	20: '0px 20px 31px 3px',
	21: '0px 21px 33px 3px',
	22: '0px 22px 35px 3px',
	23: '0px 23px 36px 3px',
	24: '0px 24px 38px 3px'
);

$shadow-ambient-elevation: (
	0: '0px 0px 0px 0px',
	1: '0px 1px 3px 0px',
	2: '0px 1px 5px 0px',
	3: '0px 1px 8px 0px',
	4: '0px 1px 10px 0px',
	5: '0px 1px 14px 0px',
	6: '0px 1px 18px 0px',
	7: '0px 2px 16px 1px',
	8: '0px 3px 14px 2px',
	9: '0px 3px 16px 2px',
	10: '0px 4px 18px 3px',
	11: '0px 4px 20px 3px',
	12: '0px 5px 22px 4px',
	13: '0px 5px 24px 4px',
	14: '0px 5px 26px 4px',
	15: '0px 6px 28px 5px',
	16: '0px 6px 30px 5px',
	17: '0px 6px 32px 5px',
	18: '0px 7px 34px 6px',
	19: '0px 7px 36px 6px',
	20: '0px 8px 38px 7px',
	21: '0px 8px 40px 7px',
	22: '0px 8px 42px 7px',
	23: '0px 9px 44px 8px',
	24: '0px 9px 46px 8px'
);


//
// @scss
@mixin shadow($depth, $change: false) {
	$shadow-umbra-depth: map-get($shadow-umbra-elevation, $depth);
	$shadow-penumbra-depth: map-get($shadow-penumbra-elevation, $depth);
	$shadow-ambient-depth: map-get($shadow-ambient-elevation, $depth);

	$shadow-umbra-color: rgba($shadow-color, $shadow-umbra-opacity);
	$shadow-penumbra-color: rgba($shadow-color, $shadow-penumbra-opacity);
	$shadow-ambient-color: rgba($shadow-color, $shadow-ambient-opacity);

	// Focus Shadow
	box-shadow:
		#{'#{$shadow-umbra-depth} #{$shadow-umbra-color}'},
		#{'#{$shadow-penumbra-depth} #{$shadow-penumbra-color}'},
		#{'#{$shadow-ambient-depth} #{$shadow-ambient-color}'};

	@if not ($change) {
		transition: #{$shadow-elevation-property} #{$shadow-duration} #{$shadow-easing};
		will-change: $shadow-elevation-property;
	}
}