@use 'true' as *;
@use './max-contrast' as *;
@use '../../../core/error/error-to-string';

@include describe('daff-max-contrast') {
	$white: #ffffff;
	$black: #000000;
	$red: #ff0000;
	$blue: #0000ff;
	$gray: #808080;
	$light-gray: #cccccc;
	$dark-gray: #333333;

	$single-color-list: ($white);
	$two-color-list: ($white, $black);
	$multiple-color-list: ($red, $blue, $gray, $light-gray, $dark-gray);
	$empty-list: ();

	@include error-to-string.set-use-string(true);

	@include it('returns the contrast ratio for single color') {
		@include assert-equal(daff-max-contrast($black, $single-color-list), white);
	}

	@include it('returns the highest contrast ratio from two colors') {
		@include assert-equal(daff-max-contrast($black, $two-color-list), white);
		@include assert-equal(daff-max-contrast($white, $two-color-list), black);
	}

	@include it('returns the highest contrast ratio from multiple colors') {
		@include assert-equal(daff-max-contrast($black, $multiple-color-list), $light-gray);

		@include assert-equal(daff-max-contrast($white, $multiple-color-list), $dark-gray);
	}

	@include it('returns consistent results regardless of list order') {
		$reordered-list: ($dark-gray, $light-gray, $gray, $blue, $red);
		@include assert-equal(
			daff-max-contrast($black, $multiple-color-list),
			daff-max-contrast($black, $reordered-list)
		);
	}

	@include it('works with different reference colors') {
		@include assert-equal(daff-max-contrast($red, ($white, $black, $blue)), black);
		@include assert-equal(daff-max-contrast($blue, ($white, $black, $red)), white);
	}

	@include it('errors when given an empty color list') {
		@include assert-equal(
			daff-max-contrast($black, $empty-list),
			'Cannot calculate max contrast for `' + $black + '`Provide at least one color to compare against.'
		);
	}

	@include error-to-string.set-use-string(false);
}