// Foundation for Sites by ZURB
// foundation.zurb.com
// Licensed under MIT Open Source

////
/// @group float grid
////

/// Change the behavior of columns defined inside this mixin to use a different column count.
/// @param {Number} $columns - Number of columns to use.
/// @param {Boolean} $root [false]
/// If `false`, selectors inside this mixin will nest inside the parent selector.
/// If `true`, selectors will not nest.
@mixin grid-context($columns, $root: false) {
    $old-grid-column-count: $grid-column-count;
    $grid-column-count: $columns !global;

    @if $root {
        @at-root {
            @content;
        }
    } @else {
        @content;
    }

    $grid-column-count: $old-grid-column-count !global;
}

/// Creates a grid row.
/// @param {Number} $columns [null] - Column count for this row. `null` will use the default column count.
/// @param {Keywords} $behavior [null] - Modifications to the default grid styles. `nest` indicates the row will be placed inside another row. `collapse` indicates that the columns inside this row will not have padding. `nest collapse` combines both behaviors.
/// @param {Keyword|Number} $size [$grid-row-width] Maximum size of the row. Set to `expand` to make the row taking the full width.
/// @param {Boolean} $cf [true] - Whether or not to include a clearfix.
/// @param {Number|Map} $gutters [$grid-column-gutter] - Gutter map or single value to use when inverting margins. Responsive gutter settings by default.
@mixin grid-row($columns: null, $behavior: null, $size: $grid-row-width, $cf: true, $gutters: $grid-column-gutter) {
    $margin: auto;

    @if index($behavior, nest) != null {
        @include grid-row-nest($gutters);

        @if index($behavior, collapse) != null {
            margin-left: 0;
            margin-right: 0;
		}
	} @else {
        @include grid-row-size($size);
        margin-left: auto;
        margin-right: auto;
    }

    @if $cf {
        @include clearfix;
    }

    @if $columns != null {
        @include grid-context($columns) {
            @content;
        }
    }
}

/// Inverts the margins of a row to nest it inside of a column.
/// @param: {Number|Map} $gutters [$grid-column-gutter]
/// Gutter map or single value to use when inverting margins. Responsive gutter settings by default.
@mixin grid-row-nest($gutters: $grid-column-gutter) {
    @include -zf-each-breakpoint {
        $margin: -zf-get-bp-val($gutters, $-zf-size) / 2 * -1;
        margin-left: $margin;
        margin-right: $margin;
    }
}

/// Set a grid row size
/// @param: {Keyword|Number} $size [$grid-row-width] Maximum size of the row.
/// Set to `expand` to make the row taking the full width.
@mixin grid-row-size($size: $grid-row-width) {
    @if $size == expand {
        $size: none;
    }

    max-width: $size;
}