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Filename : _functions.scss
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// Functions
// *******************************************************************************

// Lists
// *******************************************************************************
@function slice-list($list, $start: 1, $end: length($list)) {
  $result: null;

  @if type-of($start) != number or type-of($end) != number {
    @warn "Either $start or $end are not a number for `slice`.";
  } @else if $start > $end {
    @warn "The start index has to be lesser than or equals to the end index for `slice`.";
  } @else if $start < 1 or $end < 1 {
    @warn "List indexes must be non-zero integers for `slice`.";
  } @else if $start > length($list) {
    @warn "List index is #{$start} but list is only #{length($list)} item long for `slice`.";
  } @else if $end > length($list) {
    @warn "List index is #{$end} but list is only #{length($list)} item long for `slice`.";
  } @else {
    $result: ();

    @for $i from $start through $end {
      $result: append($result, nth($list, $i));
    }
  }

  @return $result;
}

// * Units
// *******************************************************************************

// Remove the unit of a length
@function strip-unit($number) {
  @if type-of($number) == 'number' and not unitless($number) {
    @return divide($number, ($number * 0 + 1));
  }

  @return $number;
}

// Convert size px to rem
@function px-to-rem($value) {
  // Assumes the browser default font size = `16px`
  @return (divide(strip-unit($value), 16)) * 1rem;
}

// Convert size rem to px
@function rem-to-px($value) {
  // Assumes the browser default font size = `16px`
  @return (strip-unit($value) * 16) * 1px;
}

// * Colors
// *******************************************************************************

// ? Override shade, tint and shift function with custom background color option i.e $card-bg to make it similar like design
// Shade a color: mix a color with background/white
@function tint-color($color, $weight, $background: null) {
  $background: if($background, $background, white);
  @return mix($background, $color, $weight);
}

// Shade a color: mix a color with background/black
@function shade-color($color, $weight, $background: null) {
  $background: if($background, $background, black);
  @return mix($background, $color, $weight);
}

// Shade the color if the weight is positive, else tint it
@function shift-color($color, $weight, $background: null) {
  @return if($weight > 0, shade-color($color, $weight, $background), tint-color($color, -$weight));
}

//RGBA to HEX
@function rgba-to-hex($color, $background: #fff) {
  @if $color and alpha($color) != 1 {
    $percent: alpha($color) * 100%;
    $opaque: opacify($color, 1);

    @return mix($opaque, $background, $percent);
  } @else {
    @return $color;
  }
}

// Calculating Color Contrast
@function contrast-value($color) {
  @if $color == transparent {
    @return $body-color;
  } @else if alpha($color) != 1 {
    $color: rgba-to-hex($color);
  }

  $r: red($color);
  $g: green($color);
  $b: blue($color);

  @return divide((($r * 299) + ($g * 587) + ($b * 114)), 1000);
}

// * Utilities
// *******************************************************************************

// Return Nav opacity, contrast-percent, contrast-percent-inverted, bg, color, active-color, disabled-color, muted-color, border
@function get-navbar-prop($bg, $active-color: null, $inactive-color: null, $border: null) {
  $bg: rgba-to-hex($bg);

  $active-color: rgba-to-hex($active-color);
  $active-color: if($active-color, $active-color, color-contrast($bg));

  $contrast-percent: divide(contrast-value($bg), 255);
  $contrast-percent-inverted: 1 - $contrast-percent;

  $opacity: if($active-color == #fff, 0.6 + (0.4 * $contrast-percent), 0.6 + (0.4 * (1 - $contrast-percent)));

  $color: if(
    $inactive-color,
    rgba-to-hex($inactive-color, $bg),
    rgba-to-hex(rgba($active-color, if($contrast-percent < 0.25, $opacity + 0.2, $opacity)), $bg)
  );
  $disabled-color: rgba-to-hex(rgba($color, 0.6), $bg);
  $muted-color: rgba-to-hex(rgba($color, 0.75), $bg);
  $border: if(
    $border,
    $border,
    if(
      $contrast-percent > 0.75,
      rgba($active-color, divide($opacity, 8)),
      if($contrast-percent < 0.25, rgba($active-color, 0.06), rgba($active-color, 0.15))
    )
  );

  @return (
    // Metadata
    opacity: $opacity,
    contrast-percent: $contrast-percent,
    contrast-percent-inverted: $contrast-percent-inverted,
    // Colors
    bg: $bg,
    color: $color,
    active-color: $active-color,
    disabled-color: $disabled-color,
    muted-color: $muted-color,
    border: $border
  );
}