@use "sass:map";
@use "sass:meta";
@use "../variable";

/*
---
name: min()
category:
  - core/function
  - core/function/media-query
---
Return min size.

* If `$size` is key of `$_size`, return that value.
* If `$size` is number, return this.

### scss
```scss
//
// @param  size|length  $size
// @return length|false
//

@use "node_modules/sass-basis/src/css/core";

@media (min-width: core.min(md)) {
  ...
}
```
*/

@function min($size) {
  @if (null != map.get(variable.$sizes, $size)) {
    @return map.get(variable.$sizes, $size);
  } @else if ('number' == meta.type-of($size)) {
    @return $size;
  }
  @return false;
}

/*
---
name: max()
category:
  - core/function
  - core/function/media-query
---
Return max size.

* If `$size` is key of `$_size`, return that max value.
* If `$size` is number, return this.

### scss
```scss
//
// @param  size|length  $size
// @return length|false
//

@use "node_modules/sass-basis/src/css/core";

@media (max-width: core.max(md)) {
  ...
}
```
*/

@function max($size) {
  $next_size: next-size-key($size);
  @if (false != $next_size) {
    $max: map.get(variable.$sizes, $next_size) - .1;
    @return $max;
  } @else if ('number' == meta.type-of($size)) {
    @return $size;
  }
  @return false;
}

/*
---
name: prev-size-key()
category:
  - core/function
  - core/function/media-query
---
Return prev key of `$_size`

### scss
```scss
//
// @param  size  $size
// @return size
//

@use "node_modules/sass-basis/src/css/core";

$prev_size_key: core.prev-size-key(md); // => sm
```
*/

@function prev-size-key($size) {
  $prev: false;
  @each $key, $value in variable.$sizes {
    @if ($key == $size) {
      @return $prev;
    }
    $prev: $key;
  }
  @return false;
}

/*
---
name: next-size-key()
category:
  - core/function
  - core/function/media-query
---
Return next key of `$_size`

### scss
```scss
//
// @param  size  $size
// @return size
//

@use "node_modules/sass-basis/src/css/core";

$next_size_key: core.next-size-key(md); // => lg
```
*/

@function next-size-key($size) {
  $next: false;
  @each $key, $value in variable.$sizes {
    @if ($key == $size) {
      $next: $key;
    } @else if (false != $next) {
      @return $key;
    }
  }
  @return false;
}