//////////////////////////////
// Compass Extension Imports
//////////////////////////////

//////////////////////////////
// Tint and Shade
//////////////////////////////
@function tint($colour, $amount) {
  @return mix(toolkit-get('tint color'), $colour, $amount);
}

@function shade($colour, $amount) {
  @return mix(toolkit-get('shade color'), $colour, $amount);
}

//////////////////////////////
// Color Stacks
//////////////////////////////
@function color-stack($main, $secondary, $amounts...) {
  @if length($amounts) == 0 {
    $amounts: toolkit-get('color stack amounts');
  }
  @else if length($amounts) == 1 {
    $amounts: nth($amounts, 1);
  }

  $stack: $main;

  @each $amount in $amounts {
    $stack: join($stack, mix($secondary, nth($stack, 1), $amount));
  }

  @return $stack;
}

// Tint Stack
@function tint-stack($color, $amounts...) {
  @if length($amounts) > 0 {
    @return color-stack($color, toolkit-get('tint color'), $amounts);
  }
  @else {
    @return color-stack($color, toolkit-get('tint color'));
  }
}

// Shade Stack
@function shade-stack($color, $amounts...) {
  @if length($amounts) > 0 {
    @return color-stack($color, toolkit-get('shade color'), $amounts);
  }
  @else {
    @return color-stack($color, toolkit-get('shade color'));
  }
}

//////////////////////////////
// Color Scales
//////////////////////////////
@function color-scale($main, $secondary, $shades: null) {
  $shades: if($shades != null, $shades, toolkit-get('color scale shades'));

  $list: $main;

  $red1: red($main);
  $red2: red($secondary);
  $red-diff: (($red1 - $red2) / (($shades - 1)));

  $grn1: green($main);
  $grn2: green($secondary);
  $grn-diff: (($grn1 - $grn2) / (($shades - 1)));

  $blu1: blue($main);
  $blu2: blue($secondary);
  $blu-diff: (($blu1 - $blu2) / (($shades - 1)));

  $red-hold: $red1;
  $grn-hold: $grn1;
  $blu-hold: $blu1;

  @for $i from 2 through $shades {
    $red-hold: $red-hold - ($red-diff);
    $grn-hold: $grn-hold - ($grn-diff);
    $blu-hold: $blu-hold - ($blu-diff);
    $color-hold: rgb($red-hold, $grn-hold, $blu-hold);
    $list: append($list, $color-hold);
  }

  @return $list;
}