// ----
// libsass (v3.2.5)
// ----

$base_font_url : '../bower_components/oneui-core-style/dist/fonts/' !default;
$base_font_size: 1em; //16px
$base_line_height: 1.5;

//Scaling Variables
$golden:           1.618;
$minor-second:     1.067;
$major-second:     1.125;
$minor-third:      1.2;
$major-third:      1.25;
$perfect-fourth:   1.333;
$augmented-fourth: 1.414;
$perfect-fifth:    1.5;
$minor-sixth:      1.6;
$major-sixth:      1.667;
$minor-seventh:    1.778;
$major-seventh:    1.875;
$octave:           2;
$major-tenth:      2.5;
$major-eleventh:   2.667;
$major-twelfth:    3;
$double-octave:    4;

$doubleStrand : 0.875em; //14px
$modular-scale-ratio: $perfect-fourth;
$modular-scale-base: $base_font_size $doubleStrand;

// Modular Scale Mixin for Typography
$modular-scale-ratio: $perfect-fourth !default;
$modular-scale-base: em($base_font_size) em(14) !default;

@function modular-scale($increment, $value: $modular-scale-base, $ratio: $modular-scale-ratio) {
  $v1: nth($value, 1);
  $v2: nth($value, length($value));
  $value: $v1;

  // scale $v2 to just above $v1
  @while $v2 > $v1 {
    $v2: ($v2 / $ratio); // will be off-by-1
  }
  @while $v2 < $v1 {
    $v2: ($v2 * $ratio); // will fix off-by-1
  }

  // Check AFTER scaling $v2 to prevent double-counting corner-case
  $double-stranded: $v2 > $v1;

  @if $increment > 0 {
    @for $i from 1 through $increment {
      @if $double-stranded and ($v1 * $ratio) > $v2 {
        $value: $v2;
        $v2: ($v2 * $ratio);
      } @else {
        $v1: ($v1 * $ratio);
        $value: $v1;
      }
    }
  }

  @if $increment < 0 {
    // adjust $v2 to just below $v1
    @if $double-stranded {
      $v2: ($v2 / $ratio);
    }

    @for $i from $increment through -1 {
      @if $double-stranded and ($v1 / $ratio) < $v2 {
        $value: $v2;
        $v2: ($v2 / $ratio);
      } @else {
        $v1: ($v1 / $ratio);
        $value: $v1;
      }
    }
  }

  @return $value;
}

// Vertical Rhythm
@function vr($font_size,$line_height, $base: 4){

  // Format parameters
  $base_font: $base_font_size/($base_font_size*0+1);
  $font_size:$font_size/($font_size*0+1);
  $line_height:$line_height/($line_height*0+1);

  $total : ($font_size*$line_height) * $base_font;

  @return ceil($total % $base) * 1px;

}

$headings : (
  "h1",
  "h2",
  "h3",
  "h4",
  "h5",
  "h6"
);

$increment : length($headings);

@each $heading in $headings {
  #{$heading}    {
    font-size: modular-scale($increment);
    line-height: modular-scale(1);
    margin: vr(modular-scale($increment), $base_line_height,4) 0;
  }
  $increment: $increment - 1;
}