@use '../../node_modules/sass-true/sass/true' as *;
@use '../../sass/adjust/parse';
@use 'sass:meta';

@function compliment(
  $val
) {
  @return ($val + 180) % 360;
}

@include describe('adjust/parse') {
  @include describe('from()') {
    @include it('Returns the given value for a channel key') {
      @include assert-equal(
        parse.from(50, l, l),
        50
      );
      @include assert-equal(
        parse.from(50, c, c),
        50
      );
      @include assert-equal(
        parse.from(50, h, h),
        50
      );
    }

    @include it('Replace value with a unitless number') {
      @include assert-equal(
        parse.from(60, 20, l),
        20
      );
    }

    @include it('Multiplies key-unit values') {
      @include assert-equal(
        parse.from(40, 2l, l),
        80
      );
      @include assert-equal(
        parse.from(15, 2c, c),
        30
      );
    }

    @include it('Can pass the value to a simple function') {
      @include assert-equal(
        parse.from(210, meta.get-function('compliment'), h),
        30
      );
    }

    @include it('Handles linear adjustments') {
      @include assert-equal(
        parse.from(60, l 20, l),
        80
      );
      @include assert-equal(
        parse.from(60, l -20, l),
        40
      );
    }

    @include it('Handles scaled relative adjustments') {
      @include assert-equal(
        parse.from(60, l 20%, l),
        68
      );
      @include assert-equal(
        parse.from(60, l -20%, l),
        48
      );
    }
  }

  @include describe('args()') {
    @include it('Returns normalized lch args if given chroma or hue') {
      @include assert-equal(
        parse.args((lightness: 25, hue: 30), 'set'),
        (l: 25, c: null, h: 30deg)
      );

      @include assert-equal(
        parse.args((chroma: 30), 'set'),
        (l: null, c: 30, h: null),
      );
    }

    @include it('Accepts shorthand LCH channel names') {
      @include assert-equal(
        parse.args((l: 25, c: 35, h: 45), 'set'),
        (l: 25, c: 35, h: 45deg),
      );
    }

    @include it('Returns Lab vales if c/h are not given') {
      @include assert-equal(
        parse.args((l: 25), 'set'),
        (l: 25, a: null, b: null)
      );
    }

    @include it('Returns Lab vales if a/b are given') {
      @include assert-equal(
        parse.args((a: 25), 'set'),
        (l: null, a: 25, b: null)
      );

      @include assert-equal(
        parse.args((lightness: 30, b: 25), 'set'),
        (l: 30, a: null, b: 25)
      );
    }

    @include it('Errors when given both Lab & LCH args') {
      @include assert-equal(
        parse.args((c: 20, b: 30), 'set'),
        'ERROR [set()] Cannot set both Lab ($a, $b) & LCH ($c, $h) channels at once'
      );
      @include assert-equal(
        parse.args((h: 20, a: 30), 'set'),
        'ERROR [set()] Cannot set both Lab ($a, $b) & LCH ($c, $h) channels at once'
      );
    }
  }

  @include describe('do()') {
    @include it('Performs set() adjustments on a color') {
      @include assert-equal(
        parse.do('set', rebeccapurple, (l: null, c: 20, h: null)),
        #574665
      );
    }

    @include it('Performs adjust() adjustments on a color') {
      @include assert-equal(
        parse.do('adjust', rebeccapurple, (l: null, c: null, h: -60)),
        #005278
      );
    }

    @include it('Performs scale() adjustments on a color') {
      @include assert-equal(
        parse.do('scale', rebeccapurple, (l: 50%, a: null, b: null)),
        #c388f8
      );
    }
  }
}