// Grid system
//
// Generate semantic grid columns with these mixins.

// Centered container element
@mixin container-fixed($gutter: $grid-gutter-width) {
    @extend .clearfix;
    margin-right: auto;
    margin-left: auto;
    padding-left:  ($gutter / 2);
    padding-right: ($gutter / 2);
}

// Creates a wrapper for a series of columns
@mixin make-row($gutter: $grid-gutter-width) {
    @extend .clearfix;
    margin-left:  ($gutter / -2);
    margin-right: ($gutter / -2);
}

@mixin make-grid-columns($i: 1, $list: ".col-xs-#{$i}") {
    @for $i from (1 + 1) through $grid-columns {
        $list: "#{$list}, .col-xs-#{$i}";
    }
    #{$list} {
        position: relative;
        // Prevent columns from collapsing when empty
        min-height: 1px;
        // Inner gutter via padding
        padding-left:  ($grid-gutter-width / 2);
        padding-right: ($grid-gutter-width / 2);
    }
}

@mixin float-grid-columns($class, $i: 1, $list: ".col-#{$class}-#{$i}") {
    @for $i from (1 + 1) through $grid-columns {
        $list: "#{$list}, .col-#{$class}-#{$i}";
    }
    #{$list} {
        float: left;
    }
}

@mixin calc-grid-column($index, $class, $type) {
    @if ($type == width) and ($index > 0) {
        .col-#{$class}-#{$index} {
            width: percentage(($index / $grid-columns));
        }
    }
    @if ($type == push) and ($index > 0) {
        .col-#{$class}-push-#{$index} {
            left: percentage(($index / $grid-columns));
        }
    }
    @if ($type == push) and ($index == 0) {
        .col-#{$class}-push-0 {
            left: auto;
        }
    }
    @if ($type == pull) and ($index > 0) {
        .col-#{$class}-pull-#{$index} {
            right: percentage(($index / $grid-columns));
        }
    }
    @if ($type == pull) and ($index == 0) {
        .col-#{$class}-pull-0 {
            right: auto;
        }
    }
    @if ($type == offset) {
        .col-#{$class}-offset-#{$index} {
            margin-left: percentage(($index / $grid-columns));
        }
    }
}

@mixin loop-grid-columns($columns, $class, $type) {
    @for $i from 0 through $columns {
        @include calc-grid-column($i, $class, $type);
    }
}


// Create grid for specific class
@mixin make-grid($class) {
    @include float-grid-columns($class);
    @include loop-grid-columns($grid-columns, $class, width);
    @include loop-grid-columns($grid-columns, $class, pull);
    @include loop-grid-columns($grid-columns, $class, push);
    @include loop-grid-columns($grid-columns, $class, offset);
}

// Generate the extra small columns
@mixin make-xs-column($columns, $gutter: $grid-gutter-width) {
    position: relative;
    float: left;
    width: percentage(($columns / $grid-columns));
    min-height: 1px;
    padding-left:  ($gutter / 2);
    padding-right: ($gutter / 2);
}

@mixin make-xs-column-offset($columns) {
    margin-left: percentage(($columns / $grid-columns));
}