<?php
/**
 * Font Library class.
 *
 * This file contains the Font Library class definition.
 *
 * @package    WordPress
 * @subpackage Font Library
 * @since      6.4.0
 */

if ( class_exists( 'WP_Font_Library' ) ) {
	return;
}

/**
 * Font Library class.
 *
 * @since 6.4.0
 */
class WP_Font_Library {

	/**
	 * Provide the expected mime-type value for font files per-PHP release. Due to differences in the values returned these values differ between PHP versions.
	 *
	 * This is necessary until a collection of valid mime-types per-file extension can be provided to 'upload_mimes' filter.
	 *
	 * @since 6.4.0
	 *
	 * @param array $php_version_id The version of PHP to provide mime types for. The default is the current PHP version.
	 *
	 * @return Array A collection of mime types keyed by file extension.
	 */
	public static function get_expected_font_mime_types_per_php_version( $php_version_id = PHP_VERSION_ID ) {

		$php_7_ttf_mime_type = $php_version_id >= 70300 ? 'application/font-sfnt' : 'application/x-font-ttf';

		return array(
			'otf'   => 'application/vnd.ms-opentype',
			'ttf'   => $php_version_id >= 70400 ? 'font/sfnt' : $php_7_ttf_mime_type,
			'woff'  => $php_version_id >= 80100 ? 'font/woff' : 'application/font-woff',
			'woff2' => $php_version_id >= 80100 ? 'font/woff2' : 'application/font-woff2',
		);
	}

	/**
	 * Font collections.
	 *
	 * @since 6.4.0
	 *
	 * @var array
	 */
	private static $collections = array();

	/**
	 * Register a new font collection.
	 *
	 * @since 6.4.0
	 *
	 * @param array $config Font collection config options.
	 *                      See {@see wp_register_font_collection()} for the supported fields.
	 * @return WP_Font_Collection|WP_Error A font collection is it was registered successfully and a WP_Error otherwise.
	 */
	public static function register_font_collection( $config ) {
		$new_collection = new WP_Font_Collection( $config );

		if ( isset( self::$collections[ $config['id'] ] ) ) {
			return new WP_Error( 'font_collection_registration_error', 'Font collection already registered.' );
		}

		self::$collections[ $config['id'] ] = $new_collection;
		return $new_collection;
	}

	/**
	 * Gets all the font collections available.
	 *
	 * @since 6.4.0
	 *
	 * @return array List of font collections.
	 */
	public static function get_font_collections() {
		return self::$collections;
	}

	/**
	 * Gets a font collection.
	 *
	 * @since 6.4.0
	 *
	 * @param string $id Font collection id.
	 * @return array List of font collections.
	 */
	public static function get_font_collection( $id ) {
		if ( array_key_exists( $id, self::$collections ) ) {
			return self::$collections[ $id ];
		}
		return new WP_Error( 'font_collection_not_found', 'Font collection not found.' );
	}

	/**
	 * Gets the upload directory for fonts.
	 *
	 * @since 6.4.0
	 *
	 * @return string Path of the upload directory for fonts.
	 */
	public static function get_fonts_dir() {
		return path_join( WP_CONTENT_DIR, 'fonts' );
	}

	/**
	 * Sets the upload directory for fonts.
	 *
	 * @since 6.4.0
	 *
	 * @param array $defaults {
	 *     Default upload directory.
	 *
	 *     @type string $path    Path to the directory.
	 *     @type string $url     URL for the directory.
	 *     @type string $subdir  Sub-directory of the directory.
	 *     @type string $basedir Base directory.
	 *     @type string $baseurl Base URL.
	 * }
	 * @return array Modified upload directory.
	 */
	public static function set_upload_dir( $defaults ) {
		$defaults['basedir'] = WP_CONTENT_DIR;
		$defaults['baseurl'] = content_url();
		$defaults['subdir']  = '/fonts';
		$defaults['path']    = self::get_fonts_dir();
		$defaults['url']     = $defaults['baseurl'] . '/fonts';

		return $defaults;
	}

	/**
	 * Sets the allowed mime types for fonts.
	 *
	 * @since 6.4.0
	 *
	 * @param array $mime_types List of allowed mime types.
	 * @return array Modified upload directory.
	 */
	public static function set_allowed_mime_types( $mime_types ) {
		return array_merge( $mime_types, self::get_expected_font_mime_types_per_php_version() );
	}
}