// SCSS mixins
// ---------------------------------------

// Global variables used in mixins.

// Number of breakpoints.
$breakpoints-limit: length($breakpoints);

// List of rootsizes, breakpoints, and max-widths.
$sizes: map-values($rootsizes);
$points: map-values($breakpoints);
$line-widths: map-values($measures);
$max-widths: map-values($maxwidths);


// Breakpoints. Either set one to one of the breakpoint variables, or use a custom value for minor breakpoints.
// Defaults to min-width, but both min->max and max-width are available too.
// Parts based on https://gist.github.com/timknight/03e6335b8816aa534cf7
@mixin breakpoint($break: 0, $max: 0) {
  // Type of break variable
  $value: type-of($break);

  // If it is a string (i.e. a breakpoint variable).
  @if $value == string {
    // If using 'break-1', 'break-2' etc output the correct breakpoints from map.
    @if map-has-key($breakpoints, $break) {
      @media screen and (min-width: #{map-get($breakpoints, $break) / 16 * 1em} ) { @content; }
    } @else {
      @warn "#{$break} is not a set breakpoint variable";
    }

  // If it is a number, use this for the breakpoint.
  } @else if $value == number {
    // If using other numbers output value in ems either for min, min & max or max width breakpoints.
    $query: "all" !default;
    @if      $break != 0 and $max != 0 { $query: "(min-width: #{$break / 16 * 1em}) and (max-width: #{$max / 16 * 1em})"; }
    @else if $break != 0 and $max == 0 { $query: "(min-width: #{$break / 16 * 1em})"; }
    @else if $break == 0 and $max != 0 { $query: "(max-width: #{$max / 16 * 1em})"; }
    @media #{$query} { @content; }

  } @else {
    @warn "#{$break} is not valid to use as a breakpoint";
  }
}

// Root font-size in %, outputted in correct breakpoints.
@mixin rootsize {
  font-size: nth($sizes, 1) / 16 * 100%;

  // Loop through breakpoints.
  @for $i from 2 through $breakpoints-limit {
    @media screen and (min-width: nth($points, $i) / 16 * 1em ) {
      font-size: nth($sizes, $i) / 16 * 100%;
    }
  }
}

// Max-widths for typeset containers, outputted in correct breakpoints.
@mixin maxwidth($breakpoint: 0) {
  // Type of chosen variables.
  $break-value: type-of($breakpoint);

  // If specifying a breakpoint to use (and breakpoint exists).
  @if $break-value == number and $breakpoint <= ($breakpoints-limit - 1) and $breakpoint >= 0 {

    max-width: #{nth($max-widths, ($breakpoint + 1)) / nth($sizes, ($breakpoint + 1))}rem;

  } @else if $breakpoint == all {
    max-width: #{nth($max-widths, 1) / nth($sizes, 1)}rem;

    // Loop through breakpoints.
    @for $i from 2 through $breakpoints-limit {
      @media screen and (min-width: nth($points, $i) / 16 * 1em ) {
        max-width: #{nth($max-widths, $i) / nth($sizes, $i)}rem;
      }
    }
  }
}

// Set the measure for single columns, outputted in correct breakpoints.
@mixin measure($breakpoint: 0) {
  // Type of chosen variables.
  $break-value: type-of($breakpoint);

  // If specifying a breakpoint to use (and breakpoint exists).
  @if $break-value == number and $breakpoint <= ($breakpoints-limit - 1) and $breakpoint >= 0 {

    max-width: #{nth($line-widths, ($breakpoint + 1)) / nth($sizes, ($breakpoint + 1))}rem;

  } @else if $breakpoint == all {
    max-width: #{nth($line-widths, 1) / nth($sizes, 1)}rem;

    // Loop through breakpoints.
    @for $i from 2 through $breakpoints-limit {
      @media screen and (min-width: nth($points, $i) / 16 * 1em ) {
        max-width: #{nth($line-widths, $i) / nth($sizes, $i)}rem;
      }
    }
  }
}

// Calculate percentage width of container to get optimal measure for main text columns.
// Defaults to all breakpoints.
// Note: will not output for base breakpoint as this comes from the 'measure' mixin.
@mixin ideal-measure($breakpoint: 0, $gutter: 0, $main: true, $output: max-width) {
  // Type of chosen variables.
  $break-value: type-of($breakpoint);

  // If specifying a breakpoint to use (and breakpoint exists and is larger than 0).
  @if $break-value == number and $breakpoint <= ($breakpoints-limit - 1) and $breakpoint > 0 {

    @if $gutter == small {
      $gutter: map-get($gutterwidths, small) * 2 / 1rem;
    } @else if $gutter == medium {
      $gutter: map-get($gutterwidths, medium) * 2 / 1rem;
    } @else if $gutter == large {
      $gutter: map-get($gutterwidths, large) * 2 / 1rem;
    } @else {
      $gutter: 0;
    }

    $rootsize: map-get($rootsizes, rootsize-#{$breakpoint});
    $ideal-measure: map-get($measures, measure-#{$breakpoint});
    $gutter-size: ($gutter * $rootsize);
    $container-width: map-get($maxwidths, width-#{$breakpoint});

    $percentage: percentage(($ideal-measure + $gutter-size) / $container-width);

    @if $percentage < 55 {
      $percentage: 55%;
    } @else if $percentage > 65 {
      $percentage: 65%;
    }

    @if $main == false {
      $percentage: 100 - $percentage;
    }

    #{$output}: $percentage;
  }
}

// Value in scale in $modular-scale?
// Used in following fontsize mixin.
@function in-modular-scale($scale, $key) {
  $map: map-get($modular-scale, $scale);
  $output: map-has-key($map, $key);
  @return $output;
}

// Font-size in rems. Either set per breakpoint or for all.
// Use values as you would for pixels i.e. 16 or use values from the modular scale.
@mixin fontsize($fontsize, $breakpoint: 0) {
  // Type of chosen variables.
  $font-value: type-of($fontsize);
  $break-value: type-of($breakpoint);

  // Check if value exists in scale.
  $in-scale: in-modular-scale(scale-0, $fontsize);

  // If specifying a breakpoint to use (and breakpoint exists).
  @if $break-value == number and $breakpoint <= ($breakpoints-limit - 1) and $breakpoint >= 0 {

    // If using a number for fontsize.
    @if $font-value == number {
      font-size: #{$fontsize / nth($sizes, ($breakpoint + 1))}rem;

    // If using a variable from the scale for fontsize.
    } @else if $in-scale == true {
      $get-scale: map-get($modular-scale, scale-#{$breakpoint});
      $get-size: map-get($get-scale, $fontsize);

      font-size: #{$get-size / nth($sizes, ($breakpoint + 1))}rem;

    } @else {
      @warn "#{$fontsize} is not a valid scale variable";
    }

  // If want to use value for all breakpoints.
  } @else if $breakpoint == all {

    // If using a number for fontsize.
    @if $font-value == number {
      font-size: #{$fontsize / nth($sizes, 1)}rem;

      // Loop through breakpoints.
      @for $i from 2 through $breakpoints-limit {
        @media screen and (min-width: nth($points, $i) / 16 * 1em ) {
          font-size: #{$fontsize / nth($sizes, $i)}rem;
        }
      }

    // If using a variable from the scale for fontsize.
    } @else if $in-scale == true {
      $get-scale: map-get($modular-scale, scale-0);
      $get-size: map-get($get-scale, $fontsize);
      font-size: #{$get-size / nth($sizes, 1)}rem;

      // Loop through breakpoints.
      @for $i from 2 through $breakpoints-limit {
        $get-scale: map-get($modular-scale, scale-#{$i - 1});
        $get-size: map-get($get-scale, $fontsize);

        @media screen and (min-width: nth($points, $i) / 16 * 1em ) {
          font-size: #{$get-size / nth($sizes, $i)}rem;
        }
      }

    } @else {
      @warn "#{$fontsize} is not a valid scale variable";
    }

  } @else {
    @warn "#{$breakpoint} is not valid to use as a breakpoint";
  }
}

// Advanced baseline magic.
// ! Read the README to help understand what is going on here.
// Parts based on https://gist.github.com/razwan/10662500
@mixin baseline($fontsize, $font, $lineheight: 2, $below: 2, $breakpoint: 0) {
  // Type of chosen variables.
  $font-value: type-of($fontsize);
  $break-value: type-of($breakpoint);

  // Cap height
  $cap-height: map-get($font, cap-height);

  // Check if value exists in scale.
  $in-scale: in-modular-scale(scale-0, $fontsize);

  // Set the line-height (if it isn’t set at 0).
  @if $lineheight != 0 {
    line-height: #{$lineheight}rem;
  }

  // If specifying a breakpoint to use (and breakpoint exists).
  @if $break-value == number and $breakpoint <= ($breakpoints-limit - 1) and $breakpoint >= 0 {

    // If using a number for fontsize.
    @if $font-value == number {
      $rootsize: nth($sizes, ($breakpoint + 1));
      $baseline-shift: #{($fontsize / 2 * (($lineheight * $rootsize / $fontsize) - $cap-height)) / $rootsize + 0.00001};
      $baseline-push: #{$below - (($fontsize / 2 * (($lineheight * $rootsize / $fontsize) - $cap-height)) / $rootsize + 0.00001)};

      margin-bottom: #{$baseline-push}rem;
      padding-top: #{$baseline-shift}rem;

    // If using a variable from the scale for fontsize.
    } @else if $in-scale == true {
      $get-scale: map-get($modular-scale, scale-#{$breakpoint});
      $get-size: map-get($get-scale, $fontsize);
      $rootsize: nth($sizes, ($breakpoint + 1));

      $baseline-shift: #{($get-size / 2 * (($lineheight * $rootsize / $get-size) - $cap-height)) / $rootsize + 0.00001};
      $baseline-push: #{$below - (($get-size / 2 * (($lineheight * $rootsize / $get-size) - $cap-height)) / $rootsize + 0.00001)};

      margin-bottom: #{$baseline-push}rem;
      padding-top: #{$baseline-shift}rem;

    } @else {
      @warn "#{$fontsize} is not a valid scale variable";
    }

  // If want to use value for all breakpoints.
  } @else if $breakpoint == all {

    // If using a number for fontsize.
    @if $font-value == number {
      $rootsize: nth($sizes, 1);
      $baseline-shift: #{($fontsize / 2 * (($lineheight * $rootsize / $fontsize) - $cap-height)) / $rootsize + 0.00001};
      $baseline-push: #{$below - (($fontsize / 2 * (($lineheight * $rootsize / $fontsize) - $cap-height)) / $rootsize + 0.00001)};

      margin-bottom: #{$baseline-push}rem;
      padding-top: #{$baseline-shift}rem;

      // Loop through breakpoints.
      @for $i from 2 through $breakpoints-limit {
        $rootsize: nth($sizes, $i);
        $baseline-shift: #{($fontsize / 2 * (($lineheight * $rootsize / $fontsize) - $cap-height)) / $rootsize + 0.00001};
        $baseline-push: #{$below - (($fontsize / 2 * (($lineheight * $rootsize / $fontsize) - $cap-height)) / $rootsize + 0.00001)};

        @media screen and (min-width: nth($points, $i) / 16 * 1em ) {
          margin-bottom: #{$baseline-push}rem;
          padding-top: #{$baseline-shift}rem;
        }
      }

    // If using a variable from the scale for fontsize.
    } @else if $in-scale == true {
      $get-scale: map-get($modular-scale, scale-0);
      $get-size: map-get($get-scale, $fontsize);
      $rootsize: nth($sizes, 1);

      $baseline-shift: #{($get-size / 2 * (($lineheight * $rootsize / $get-size) - $cap-height)) / $rootsize + 0.00001};
      $baseline-push: #{$below - (($get-size / 2 * (($lineheight * $rootsize / $get-size) - $cap-height)) / $rootsize + 0.00001)};

      margin-bottom: #{$baseline-push}rem;
      padding-top: #{$baseline-shift}rem;

      // Loop through breakpoints.
      @for $i from 2 through $breakpoints-limit {
        $get-scale: map-get($modular-scale, scale-#{$i - 1});
        $get-size: map-get($get-scale, $fontsize);
        $rootsize: nth($sizes, $i);

        $baseline-shift: #{($get-size / 2 * (($lineheight * $rootsize / $get-size) - $cap-height)) / $rootsize + 0.00001};
        $baseline-push: #{$below - (($get-size / 2 * (($lineheight * $rootsize / $get-size) - $cap-height)) / $rootsize + 0.00001)};

        @media screen and (min-width: nth($points, $i) / 16 * 1em ) {
          margin-bottom: #{$baseline-push}rem;
          padding-top: #{$baseline-shift}rem;
        }
      }

    } @else {
      @warn "#{$fontsize} is not a valid scale variable";
    }

  } @else {
    @warn "#{$breakpoint} is not valid to use as a breakpoint";
  }
}

// Set fontsize and baseline at once. Mix of fontsize and baseline mixin.
@mixin sassline($fontsize, $font, $lineheight: 2, $below: 2, $breakpoint: 0) {
  $font-value: type-of($fontsize);
  $break-value: type-of($breakpoint);
  $cap-height: map-get($font, cap-height);
  $in-scale: in-modular-scale(scale-0, $fontsize);

  line-height: #{$lineheight}rem;

  @if $break-value == number and $breakpoint <= ($breakpoints-limit - 1) and $breakpoint >= 0 {

    @if $font-value == number {
      $rootsize: nth($sizes, ($breakpoint + 1));
      $baseline-shift: #{($fontsize / 2 * (($lineheight * $rootsize / $fontsize) - $cap-height)) / $rootsize + 0.00001};
      $baseline-push: #{$below - (($fontsize / 2 * (($lineheight * $rootsize / $fontsize) - $cap-height)) / $rootsize + 0.00001)};
      font-size: #{$fontsize / nth($sizes, ($breakpoint + 1))}rem;
      margin-bottom: #{$baseline-push}rem;
      padding-top: #{$baseline-shift}rem;

    } @else if $in-scale == true {
      $get-scale: map-get($modular-scale, scale-#{$breakpoint});
      $get-size: map-get($get-scale, $fontsize);
      $rootsize: nth($sizes, ($breakpoint + 1));
      $baseline-shift: #{($get-size / 2 * (($lineheight * $rootsize / $get-size) - $cap-height)) / $rootsize + 0.00001};
      $baseline-push: #{$below - (($get-size / 2 * (($lineheight * $rootsize / $get-size) - $cap-height)) / $rootsize + 0.00001)};
      font-size: #{$get-size / nth($sizes, ($breakpoint + 1))}rem;
      margin-bottom: #{$baseline-push}rem;
      padding-top: #{$baseline-shift}rem;

    } @else {
      @warn "#{$fontsize} is not a valid scale variable";
    }

  } @else if $breakpoint == all {

    @if $font-value == number {
      $rootsize: nth($sizes, 1);
      $baseline-shift: #{($fontsize / 2 * (($lineheight * $rootsize / $fontsize) - $cap-height)) / $rootsize + 0.00001};
      $baseline-push: #{$below - (($fontsize / 2 * (($lineheight * $rootsize / $fontsize) - $cap-height)) / $rootsize + 0.00001)};
      font-size: #{$fontsize / nth($sizes, 1)}rem;
      margin-bottom: #{$baseline-push}rem;
      padding-top: #{$baseline-shift}rem;

      @for $i from 2 through $breakpoints-limit {
        $rootsize: nth($sizes, $i);
        $baseline-shift: #{($fontsize / 2 * (($lineheight * $rootsize / $fontsize) - $cap-height)) / $rootsize + 0.00001};
        $baseline-push: #{$below - (($fontsize / 2 * (($lineheight * $rootsize / $fontsize) - $cap-height)) / $rootsize + 0.00001)};
        @media screen and (min-width: nth($points, $i) / 16 * 1em ) {
          font-size: #{$fontsize / nth($sizes, $i)}rem;
          margin-bottom: #{$baseline-push}rem;
          padding-top: #{$baseline-shift}rem;
        }
      }

    } @else if $in-scale == true {
      $get-scale: map-get($modular-scale, scale-0);
      $get-size: map-get($get-scale, $fontsize);
      $rootsize: nth($sizes, 1);
      $baseline-shift: #{($get-size / 2 * (($lineheight * $rootsize / $get-size) - $cap-height)) / $rootsize + 0.00001};
      $baseline-push: #{$below - (($get-size / 2 * (($lineheight * $rootsize / $get-size) - $cap-height)) / $rootsize + 0.00001)};
      font-size: #{$get-size / nth($sizes, 1)}rem;
      margin-bottom: #{$baseline-push}rem;
      padding-top: #{$baseline-shift}rem;

      @for $i from 2 through $breakpoints-limit {
        $get-scale: map-get($modular-scale, scale-#{$i - 1});
        $get-size: map-get($get-scale, $fontsize);
        $rootsize: nth($sizes, $i);
        $baseline-shift: #{($get-size / 2 * (($lineheight * $rootsize / $get-size) - $cap-height)) / $rootsize + 0.00001};
        $baseline-push: #{$below - (($get-size / 2 * (($lineheight * $rootsize / $get-size) - $cap-height)) / $rootsize + 0.00001)};
        @media screen and (min-width: nth($points, $i) / 16 * 1em ) {
          font-size: #{$get-size / nth($sizes, $i)}rem;
          margin-bottom: #{$baseline-push}rem;
          padding-top: #{$baseline-shift}rem;
        }
      }

    } @else {
      @warn "#{$fontsize} is not a valid scale variable";
    }

  } @else {
    @warn "#{$breakpoint} is not valid to use as a breakpoint";
  }
}

// Clearfix.
@mixin clearfix {
  &:before, &:after{
    display: table;
    content: "";
  }
  &:after{
    clear: both;
  }
}
