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<?php

// Exit if accessed directly.
if (!defined('ABSPATH')) {
	exit;
}

if (!class_exists('awpa_Google_Fonts')) {
	class awpa_Google_Fonts
	{
		function __construct()
		{
			add_action('wp_head', array($this, 'enqueue_frontend_block_fonts'), 100);
		}

		public function enqueue_frontend_block_fonts()
		{
			if (!apply_filters('awpa_enqueue_fonts', true)) {
				return;
			}

			if (is_single() || is_page() || is_404()) {
				global $post;
				if (is_object($post) && property_exists($post, 'post_content')) {
					$this->_enqueue_frontend_block_fonts($post->post_content);
				}
			} elseif (is_archive() || is_home() || is_search()) {
				global $wp_query;
				foreach ($wp_query as $post) {
					if (is_object($post) && property_exists($post, 'post_content')) {
						$this->_enqueue_frontend_block_fonts($post->post_content);
					}
				}
			}
		}

		public function _enqueue_frontend_block_fonts($content)
		{
			$blocks = parse_blocks($content);
			$google_fonts = $this->gather_google_fonts($blocks);
			$this->enqueue_google_fonts($google_fonts);
		}

		public function is_web_font($font_name)
		{
			return !in_array(strtolower($font_name), ['serif', 'sans-serif', 'monospace', 'serif-alt']);
		}

		public function is_awpa_block($block_name)
		{
			if ( ! empty( $block_name ) ) {
			return strpos($block_name, 'awpa/') === 0;
			}
		}

		public function gather_google_fonts($blocks)
		{

			$google_fonts = array();
			foreach ($blocks as $block) {

				// Gather all "fontFamily" attribute values
				if ($this->is_awpa_block($block['blockName'])) {
					foreach ($block['attrs'] as $attr_name => $font_name) {
						if (preg_match('/fontFamily$/i', $attr_name)) {
							if (!$this->is_web_font($font_name)) {
								continue;
							}
							if (!in_array($font_name, $google_fonts)) {
								$google_fonts[] = $font_name;
							}
						}
					}
				}
				if (!empty($block['innerBlocks'])) {
					$google_fonts = array_unique(array_merge($google_fonts, $this->gather_google_fonts($block['innerBlocks'])));
				}
			}

			return $google_fonts;
		}

		/**
		 * Based on: https://github.com/elementor/elementor/blob/bc251b81afb626c4c47029aea8a762566524a811/includes/frontend.php#L647
		 */
		public function enqueue_google_fonts($google_fonts)
		{
			if (!count($google_fonts)) {
				return;
			}

			foreach ($google_fonts as &$font) {
				$font = str_replace(' ', '+', $font) . ':100,100italic,200,200italic,300,300italic,400,400italic,500,500italic,600,600italic,700,700italic,800,800italic,900,900italic';
			}

			$fonts_url = sprintf('https://fonts.googleapis.com/css?family=%s', implode(rawurlencode('|'), $google_fonts));

			$subsets = [
				'ru_RU' => 'cyrillic',
				'bg_BG' => 'cyrillic',
				'he_IL' => 'hebrew',
				'el' => 'greek',
				'vi' => 'vietnamese',
				'uk' => 'cyrillic',
				'cs_CZ' => 'latin-ext',
				'ro_RO' => 'latin-ext',
				'pl_PL' => 'latin-ext',
			];

			$locale = get_locale();
			if (isset($subsets[$locale])) {
				$fonts_url .= '&subset=' . $subsets[$locale];
			}

			wp_enqueue_style('awpa-google-fonts', $fonts_url); // phpcs:ignore WordPress.WP.EnqueuedResourceParameters.MissingVersion
		}
	}

	new awpa_Google_Fonts();
}