/**
 * Requires
 */
@use 'sass:meta';
@use 'sass:list';
@use '../abstract/has-query' as *;
@use '../abstract/is-query' as *;
@use '../mixins/font-fluid' as *;
@use '../mixins/attr-set-map' as *;
@use '../media';

/**
 * Simple BEM creator
 * @param {map} $nested - BEM map
 * @param {string} $query-marker - String that marks the split point, default: '_at_'
 * @param {string} $error - Error message prefix
 * @output Creates BEM style structures from a map definition
 */
@mixin bem-style($nested, $font-styles: null, $query-marker: '_at_', $error: 'bem-style::') {

  // Must be a map
  @if meta.type-of($nested) != map {
    @error '#{$error}$nested[#{meta.type-of($nested)}] must be a map';
  }

  // Cycle declarations
  @each $name, $data in $nested {

    // If the value is a map we iterate down
    @if meta.type-of($data) == map {

      // Name is a media query
      $query: is-query($name, $query-marker);
      @if $query {
        @include media.query($query) {
          @include bem-style($data);
        }
      } @else {

        // Name is combined with media query
        $combined: has-query($name, $query-marker);
        @if list.length($combined) > 1 {

          // Set name and query
          &#{list.nth($combined, 1)} {
            @include media.query(list.nth($combined, 2)) {
              @include bem-style($data);
            }
          }
        } @else {

          // Default nesting
          &#{$name} {
            @include bem-style($data);
          }
        }
      }
    } @else {

      // Refer to font style
      @if $name == 'use-font' {

        // Must be a map
        @if meta.type-of($font-styles) != map {
          @error '#{$error}$nested[#{meta.type-of($font-styles)}] must be a map';
        }

        @include attr-set-map($data, $font-styles);

        // Refer to fluid font style
      } @else if $name == 'use-fluid' {

        // Must be a map
        @if meta.type-of($font-styles) != map {
          @error '#{$error}$nested[#{meta.type-of($font-styles)}] must be a map';
        }

        @include font-fluid($data, $font-styles);

        // Refer to custom map variable with attribute references
      } @else if $name == 'use-attr' {

        // Check for valid data
        @if meta.type-of($data) == list and list.length($data) == 2 {

          // Attribute reference must be a string
          @if meta.type-of(list.nth($data, 1)) == string {

            // Any further errors are handled by the mixin
            @include attr-set-map(list.nth($data, 1), list.nth($data, 2));
          } @else {
            @error '#{$error}$name[use-attr] first value must be a string';
          }
        } @else {
          @error '#{$error}$name[use-attr] must be a list with 2 values';
        }
      } @else {

        // If not, assume a regular attribute value
        #{$name}: $data;
      }
    }
  }
}