@import "api/float";
@import "api/isolation";

//////////////////////////////
// Master Grid Span mixin
//////////////////////////////
@mixin grid-span($span, $location: 1, $grid: null, $gutter: null, $output-style: null, $gutter-style: null, $options: null) {

  @if $output-style == null {
    $output-style: sgs-get('output');
  }

  $Grid: find-grid($grid);
  $Gutter: find-gutter($gutter);
  $Style: find-gutter-style($gutter-style);

  $Start-Row: start-row($location);
  $End-Row: end-row($span, $location, $Grid);

  $Fixed-Gutter: fixed-gutter($Grid, $Gutter, $Style);
  $Split-Gutter: index($Style, 'split');
  $Gutter-Property: gutter-property($Grid, $Gutter, $Style);

  $Direction: sgs-get('direction');
  $From: if($options and type-of($options) == 'map', if(map-get($options, 'from'), map-get($options, 'from'), $Direction), $Direction);
  $From: if($From == 'ltr' or $From == 'rtl', named-direction($From), $From);

  $Holder: ();
  @each $k, $v in $options {
    $Holder: if($k == 'from', $Holder, map-merge($Holder, ($k: $v)));
  }
  $options: if(length($Holder) > 0, $Holder, null);

  $Span-Map: (
    'span': $span,
    'location': $location,
    'grid': $Grid,
    'gutter': $Gutter,
    'style': $Style,
    'start row': $Start-Row,
    'end row': $End-Row,
    'fixed gutter': $Fixed-Gutter,
    'split gutter': $Split-Gutter,
    'gutter property': $Gutter-Property,
    'options': $options
  );


  @if function-exists('output-#{$output-style}') {
    $Left: ();
    $Right: ();

    @if $Direction == 'both' or $From == 'left' or ($Direction == 'rtl' and $From == 'opposite') {
      $Left: call('output-#{$output-style}', map-merge($Span-Map, ('direction': left)));
    }

    @if $Direction == 'both' or $From == 'right' or ($Direction == 'ltr' and $From == 'opposite') {
      $Right: call('output-#{$output-style}', map-merge($Span-Map, ('direction': right)));
    }

    $Left-Keys: map-keys($Left);
    $Right-Keys: map-keys($Right);
    $Exclude: ();

    @each $key in $Left-Keys {
      @if index($Right-Keys, $key) {
        @if map-get($Right, $key) == map-get($Left, $key) {
          $Exclude: append($Exclude, $key);
        }
      }
    }

    // Always try and print the Left value
    @include grid-span-build-exclude($Left, $Exclude, false);

    // If Direction is Both or RTL, add the RTL attribute selector
    @if $Direction == 'both' or $Direction == 'rtl' {
      [dir="rtl"] & {
        @include grid-span-build-exclude($Right, $Exclude, true);
      }
    }
    @else {
      @include grid-span-build-exclude($Right, $Exclude, true);
    }
  }
  @else {
    @warn "There doesn't appear to be an output style named `#{$output-style}`. Please ensure that the function `output-#{$output-style}` and that the output style `#{$output-style}` are both available before trying to use them.";
  }
}

@mixin grid-span-build($property, $value) {
  @if type-of($value) != 'map' {
    #{$property}: $value;
  }
  @else {
    @each $prefix, $val in $value {
      #{$property}: $val;
    }
  }
}

@mixin grid-span-build-exclude($properties, $delta, $exclude: false) {
  @each $property, $value in $properties {
    @if $exclude {
      @if not index($delta, $property) {
        @include grid-span-build($property, $value);
      }
    }
    @else {
      @include grid-span-build($property, $value);
    }
  }
}