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/**
 * Font Utils class.
 *
 * Provides utility functions for working with font families.
 *
 * @package    WordPress
 * @subpackage Fonts
 * @since      6.5.0
 */

/**
 * A class of utilities for working with the Font Library.
 *
 * These utilities may change or be removed in the future and are intended for internal use only.
 *
 * @since 6.5.0
 * @access private
 */
class WP_Font_Utils {
	/**
	 * Adds surrounding quotes to font family names that contain special characters.
	 *
	 * It follows the recommendations from the CSS Fonts Module Level 4.
	 * @link https://www.w3.org/TR/css-fonts-4/#font-family-prop
	 *
	 * @since 6.5.0
	 *
	 * @param string $item A font family name.
	 * @return string The font family name with surrounding quotes, if necessary.
	 */
	private static function maybe_add_quotes( $item ) {
		// Matches strings that are not exclusively alphabetic characters or hyphens, and do not exactly follow the pattern generic(alphabetic characters or hyphens).
		$regex = &#039;/^(?!generic\([a-zA-Z\-]+\)$)(?!^[a-zA-Z\-]+$).+/&#039;;
		$item  = trim( $item );
		if ( preg_match( $regex, $item ) ) {
			$item = trim( $item, &quot;\&quot;&#039;&quot; );
			return &#039;&quot;&#039; . $item . &#039;&quot;&#039;;
		}
		return $item;
	}

	/**
	 * Sanitizes and formats font family names.
	 *
	 * - Applies `sanitize_text_field`.
	 * - Adds surrounding quotes to names containing any characters that are not alphabetic or dashes.
	 *
	 * It follows the recommendations from the CSS Fonts Module Level 4.
	 * @link https://www.w3.org/TR/css-fonts-4/#font-family-prop
	 *
	 * @since 6.5.0
	 * @access private
	 *
	 * @see sanitize_text_field()
	 *
	 * @param string $font_family Font family name(s), comma-separated.
	 * @return string Sanitized and formatted font family name(s).
	 */
	public static function sanitize_font_family( $font_family ) {
		if ( ! $font_family ) {
			return &#039;&#039;;
		}

		$output          = sanitize_text_field( $font_family );
		$formatted_items = array();
		if ( str_contains( $output, &#039;,&#039; ) ) {
			$items = explode( &#039;,&#039;, $output );
			foreach ( $items as $item ) {
				$formatted_item = self::maybe_add_quotes( $item );
				if ( ! empty( $formatted_item ) ) {
					$formatted_items[] = $formatted_item;
				}
			}
			return implode( &#039;, &#039;, $formatted_items );
		}
		return self::maybe_add_quotes( $output );
	}

	/**
	 * Generates a slug from font face properties, e.g. `open sans;normal;400;100%;U+0-10FFFF`
	 *
	 * Used for comparison with other font faces in the same family, to prevent duplicates
	 * that would both match according the CSS font matching spec. Uses only simple case-insensitive
	 * matching for fontFamily and unicodeRange, so does not handle overlapping font-family lists or
	 * unicode ranges.
	 *
	 * @since 6.5.0
	 * @access private
	 *
	 * @link https://drafts.csswg.org/css-fonts/#font-style-matching
	 *
	 * @param array $settings {
	 *     Font face settings.
	 *
	 *     @type string $fontFamily   Font family name.
	 *     @type string $fontStyle    Optional font style, defaults to &#039;normal&#039;.
	 *     @type string $fontWeight   Optional font weight, defaults to 400.
	 *     @type string $fontStretch  Optional font stretch, defaults to &#039;100%&#039;.
	 *     @type string $unicodeRange Optional unicode range, defaults to &#039;U+0-10FFFF&#039;.
	 * }
	 * @return string Font face slug.
	 */
	public static function get_font_face_slug( $settings ) {
		$defaults = array(
			&#039;fontFamily&#039;   =&gt; &#039;&#039;,
			&#039;fontStyle&#039;    =&gt; &#039;normal&#039;,
			&#039;fontWeight&#039;   =&gt; &#039;400&#039;,
			&#039;fontStretch&#039;  =&gt; &#039;100%&#039;,
			&#039;unicodeRange&#039; =&gt; &#039;U+0-10FFFF&#039;,
		);
		$settings = wp_parse_args( $settings, $defaults );
		if ( function_exists( &#039;mb_strtolower&#039; ) ) {
			$font_family = mb_strtolower( $settings[&#039;fontFamily&#039;] );
		} else {
			$font_family = strtolower( $settings[&#039;fontFamily&#039;] );
		}
		$font_style    = strtolower( $settings[&#039;fontStyle&#039;] );
		$font_weight   = strtolower( $settings[&#039;fontWeight&#039;] );
		$font_stretch  = strtolower( $settings[&#039;fontStretch&#039;] );
		$unicode_range = strtoupper( $settings[&#039;unicodeRange&#039;] );

		// Convert weight keywords to numeric strings.
		$font_weight = str_replace( array( &#039;normal&#039;, &#039;bold&#039; ), array( &#039;400&#039;, &#039;700&#039; ), $font_weight );

		// Convert stretch keywords to numeric strings.
		$font_stretch_map = array(
			&#039;ultra-condensed&#039; =&gt; &#039;50%&#039;,
			&#039;extra-condensed&#039; =&gt; &#039;62.5%&#039;,
			&#039;condensed&#039;       =&gt; &#039;75%&#039;,
			&#039;semi-condensed&#039;  =&gt; &#039;87.5%&#039;,
			&#039;normal&#039;          =&gt; &#039;100%&#039;,
			&#039;semi-expanded&#039;   =&gt; &#039;112.5%&#039;,
			&#039;expanded&#039;        =&gt; &#039;125%&#039;,
			&#039;extra-expanded&#039;  =&gt; &#039;150%&#039;,
			&#039;ultra-expanded&#039;  =&gt; &#039;200%&#039;,
		);
		$font_stretch     = str_replace( array_keys( $font_stretch_map ), array_values( $font_stretch_map ), $font_stretch );

		$slug_elements = array( $font_family, $font_style, $font_weight, $font_stretch, $unicode_range );

		$slug_elements = array_map(
			function ( $elem ) {
				// Remove quotes to normalize font-family names, and &#039;;&#039; to use as a separator.
				$elem = trim( str_replace( array( &#039;&quot;&#039;, &quot;&#039;&quot;, &#039;;&#039; ), &#039;&#039;, $elem ) );

				// Normalize comma separated lists by removing whitespace in between items,
				// but keep whitespace within items (e.g. &quot;Open Sans&quot; and &quot;OpenSans&quot; are different fonts).
				// CSS spec for whitespace includes: U+000A LINE FEED, U+0009 CHARACTER TABULATION, or U+0020 SPACE,
				// which by default are all matched by \s in PHP.
				return preg_replace( &#039;/,\s+/&#039;, &#039;,&#039;, $elem );
			},
			$slug_elements
		);

		return sanitize_text_field( implode( &#039;;&#039;, $slug_elements ) );
	}

	/**
	 * Sanitizes a tree of data using a schema.
	 *
	 * The schema structure should mirror the data tree. Each value provided in the
	 * schema should be a callable that will be applied to sanitize the corresponding
	 * value in the data tree. Keys that are in the data tree, but not present in the
	 * schema, will be removed in the sanitized data. Nested arrays are traversed recursively.
	 *
	 * @since 6.5.0
	 *
	 * @access private
	 *
	 * @param array $tree   The data to sanitize.
	 * @param array $schema The schema used for sanitization.
	 * @return array The sanitized data.
	 */
	public static function sanitize_from_schema( $tree, $schema ) {
		if ( ! is_array( $tree ) || ! is_array( $schema ) ) {
			return array();
		}

		foreach ( $tree as $key =&gt; $value ) {
			// Remove keys not in the schema or with null/empty values.
			if ( ! array_key_exists( $key, $schema ) ) {
				unset( $tree[ $key ] );
				continue;
			}

			$is_value_array  = is_array( $value );
			$is_schema_array = is_array( $schema[ $key ] ) &amp;&amp; ! is_callable( $schema[ $key ] );

			if ( $is_value_array &amp;&amp; $is_schema_array ) {
				if ( wp_is_numeric_array( $value ) ) {
					// If indexed, process each item in the array.
					foreach ( $value as $item_key =&gt; $item_value ) {
						$tree[ $key ][ $item_key ] = isset( $schema[ $key ][0] ) &amp;&amp; is_array( $schema[ $key ][0] )
							? self::sanitize_from_schema( $item_value, $schema[ $key ][0] )
							: self::apply_sanitizer( $item_value, $schema[ $key ][0] );
					}
				} else {
					// If it is an associative or indexed array, process as a single object.
					$tree[ $key ] = self::sanitize_from_schema( $value, $schema[ $key ] );
				}
			} elseif ( ! $is_value_array &amp;&amp; $is_schema_array ) {
				// If the value is not an array but the schema is, remove the key.
				unset( $tree[ $key ] );
			} elseif ( ! $is_schema_array ) {
				// If the schema is not an array, apply the sanitizer to the value.
				$tree[ $key ] = self::apply_sanitizer( $value, $schema[ $key ] );
			}

			// Remove keys with null/empty values.
			if ( empty( $tree[ $key ] ) ) {
				unset( $tree[ $key ] );
			}
		}

		return $tree;
	}

	/**
	 * Applies a sanitizer function to a value.
	 *
	 * @since 6.5.0
	 *
	 * @param mixed    $value     The value to sanitize.
	 * @param callable $sanitizer The sanitizer function to apply.
	 * @return mixed The sanitized value.
	 */
	private static function apply_sanitizer( $value, $sanitizer ) {
		if ( null === $sanitizer ) {
			return $value;

		}
		return call_user_func( $sanitizer, $value );
	}

	/**
	 * Returns the expected mime-type values for font files, depending on PHP version.
	 *
	 * This is needed because font mime types vary by PHP version, so checking the PHP version
	 * is necessary until a list of valid mime-types for each file extension can be provided to
	 * the &#039;upload_mimes&#039; filter.
	 *
	 * @since 6.5.0
	 *
	 * @access private
	 *
	 * @return string[] A collection of mime types keyed by file extension.
	 */
	public static function get_allowed_font_mime_types() {
		$php_7_ttf_mime_type = PHP_VERSION_ID &gt;= 70300 ? &#039;application/font-sfnt&#039; : &#039;application/x-font-ttf&#039;;

		return array(
			&#039;otf&#039;   =&gt; &#039;application/vnd.ms-opentype&#039;,
			&#039;ttf&#039;   =&gt; PHP_VERSION_ID &gt;= 70400 ? &#039;font/sfnt&#039; : $php_7_ttf_mime_type,
			&#039;woff&#039;  =&gt; PHP_VERSION_ID &gt;= 80112 ? &#039;font/woff&#039; : &#039;application/font-woff&#039;,
			&#039;woff2&#039; =&gt; PHP_VERSION_ID &gt;= 80112 ? &#039;font/woff2&#039; : &#039;application/font-woff2&#039;,
		);
	}
}
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