<?php
/**
 * Cartflows Gb Helper.
 *
 * @package Cartflows
 */

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

if ( ! class_exists( 'Cartflows_Gb_Helper' ) ) {

	/**
	 * Class Cartflows_Gb_Helper.
	 */
	final class Cartflows_Gb_Helper {


		/**
		 * Member Variable
		 *
		 * @since x.x.x
		 * @var instance
		 */
		private static $instance;

		/**
		 * Member Variable
		 *
		 * @since x.x.x
		 * @var instance
		 */
		public static $block_list;

		/**
		 * Current Block List
		 *
		 * @since x.x.x
		 * @var current_block_list
		 */
		public static $current_block_list = array();

		/**
		 * Page Blocks Variable
		 *
		 * @since x.x.x
		 * @var instance
		 */
		public static $page_blocks;

		/**
		 * Stylesheet
		 *
		 * @since x.x.x
		 * @var stylesheet
		 */
		public static $stylesheet;

		/**
		 * Script
		 *
		 * @since x.x.x
		 * @var script
		 */
		public static $script;

		/**
		 * Cartflows Block Flag
		 *
		 * @since x.x.x
		 * @var cf_flag
		 */
		public static $cf_flag = false;

		/**
		 * Google fonts to enqueue
		 *
		 * @var array
		 */
		public static $gfonts = array();

		/**
		 *  Initiator
		 *
		 * @since x.x.x
		 */
		public static function get_instance() {
			if ( ! isset( self::$instance ) ) {
				self::$instance = new self();
			}
			return self::$instance;
		}

		/**
		 * Constructor
		 */
		public function __construct() {
			require CARTFLOWS_DIR . 'modules/gutenberg/classes/class-cartflows-block-config.php';
			require CARTFLOWS_DIR . 'modules/gutenberg/classes/class-cartflows-block-helper.php';
			require CARTFLOWS_DIR . 'modules/gutenberg/classes/class-cartflows-block-js.php';

			self::$block_list = Cartflows_Block_Config::get_block_attributes();

			add_action( 'wp', array( $this, 'wp_actions' ), 10 );
		}

		/**
		 * WP Actions.
		 */
		public function wp_actions() {

			if ( wcf()->utils->is_step_post_type() ) {

				$this->generate_assets();
				add_action( 'wp_enqueue_scripts', array( $this, 'block_assets' ), 10 );
				add_action( 'wp_head', array( $this, 'frontend_gfonts' ), 120 );
				add_action( 'wp_head', array( $this, 'print_stylesheet' ), 80 );
				add_action( 'wp_footer', array( $this, 'print_script' ), 1000 );
			}

		}

		/**
		 * Load the front end Google Fonts.
		 */
		public function frontend_gfonts() {

			if ( empty( self::$gfonts ) ) {
				return;
			}
			$show_google_fonts = apply_filters( 'cf_blocks_show_google_fonts', true );
			if ( ! $show_google_fonts ) {
				return;
			}
			$link    = '';
			$subsets = array();
			foreach ( self::$gfonts as $key => $gfont_values ) {
				if ( ! empty( $link ) ) {
					$link .= '%7C'; // Append a new font to the string.
				}
				$link .= $gfont_values['fontfamily'];
				if ( ! empty( $gfont_values['fontvariants'] ) ) {
					$link .= ':';
					$link .= implode( ',', $gfont_values['fontvariants'] );
				}
				if ( ! empty( $gfont_values['fontsubsets'] ) ) {
					foreach ( $gfont_values['fontsubsets'] as $subset ) {
						if ( ! in_array( $subset, $subsets, true ) ) {
							array_push( $subsets, $subset );
						}
					}
				}
			}
			if ( ! empty( $subsets ) ) {
				$link .= '&amp;subset=' . implode( ',', $subsets );
			}

			if ( isset( $link ) && ! empty( $link ) ) {
				echo '<link id="cf_show_google_fonts" href="//fonts.googleapis.com/css?family=' . esc_attr( str_replace( '|', '%7C', $link ) ) . '" rel="stylesheet">'; //phpcs:ignore WordPress.WP.EnqueuedResources.NonEnqueuedStylesheet
			}
		}

		/**
		 * Print the Script in footer.
		 */
		public function print_script() {

			if ( is_null( self::$script ) || '' === self::$script ) {
				return;
			}

			ob_start();
			?>
			<script type="text/javascript" id="cf-script-frontend"><?php echo self::$script; //phpcs:ignore WordPress.XSS.EscapeOutput.OutputNotEscaped ?></script>
			<?php
			ob_end_flush();
		}

		/**
		 * Print the Stylesheet in header.
		 */
		public function print_stylesheet() {

			if ( is_null( self::$stylesheet ) || '' === self::$stylesheet ) {
				return;
			}

			ob_start();
			?>
			<style id="cf-style-frontend"><?php echo self::$stylesheet; //phpcs:ignore WordPress.XSS.EscapeOutput.OutputNotEscaped ?></style>
			<?php
			ob_end_flush();
		}


		/**
		 * Generates stylesheet and appends in head tag.
		 *
		 * @since x.x.x
		 */
		public function generate_assets() {

			$this_post = array();

			global $post;
			$this_post = $post;

			if ( ! is_object( $this_post ) ) {
				return;
			}

			/**
			 * Filters the post to build stylesheet for.
			 *
			 * @param \WP_Post $this_post The global post.
			 */
			$this_post = apply_filters( 'cf_post_for_stylesheet', $this_post );

			$this->get_generated_stylesheet( $this_post );
		}

		/**
		 * Generates stylesheet in loop.
		 *
		 * @param object $this_post Current Post Object.
		 * @since x.x.x
		 */
		public function get_generated_stylesheet( $this_post ) {

			if ( is_object( $this_post ) && isset( $this_post->ID ) && has_blocks( $this_post->ID ) && isset( $this_post->post_content ) ) {

				$blocks = $this->parse( $this_post->post_content );

				self::$page_blocks = $blocks;

				if ( ! is_array( $blocks ) || empty( $blocks ) ) {
					return;
				}

				$assets = $this->get_assets( $blocks );

				self::$stylesheet .= $assets['css'];
				self::$script     .= $assets['js'];
			}
		}

		/**
		 * Enqueue Gutenberg block assets for both frontend + backend.
		 *
		 * @since x.x.x
		 */
		public function block_assets() {

			$block_list_for_assets = self::$current_block_list;

			$blocks = Cartflows_Block_Config::get_block_attributes();

			foreach ( $block_list_for_assets as $key => $curr_block_name ) {

				$js_assets = ( isset( $blocks[ $curr_block_name ]['js_assets'] ) ) ? $blocks[ $curr_block_name ]['js_assets'] : array();

				$css_assets = ( isset( $blocks[ $curr_block_name ]['css_assets'] ) ) ? $blocks[ $curr_block_name ]['css_assets'] : array();

				foreach ( $js_assets as $asset_handle => $val ) {
					// Scripts.
					wp_enqueue_script( $val );
				}

				foreach ( $css_assets as $asset_handle => $val ) {
					// Styles.
					wp_enqueue_style( $val );
				}
			}

		}

		/**
		 * Parse Guten Block.
		 *
		 * @param string $content the content string.
		 * @since x.x.x
		 */
		public function parse( $content ) {

			global $wp_version;

			return ( version_compare( $wp_version, '5', '>=' ) ) ? parse_blocks( $content ) : gutenberg_parse_blocks( $content );
		}

		/**
		 * Generates stylesheet for reusable blocks.
		 *
		 * @param array $blocks Blocks array.
		 * @since x.x.x
		 */
		public function get_assets( $blocks ) {

			$desktop = '';
			$tablet  = '';
			$mobile  = '';

			$tab_styling_css = '';
			$mob_styling_css = '';

			$js = '';

			foreach ( $blocks as $i => $block ) {

				if ( is_array( $block ) ) {

					if ( '' === $block['blockName'] ) {
						continue;
					}
					if ( 'core/block' === $block['blockName'] ) {
						$id = ( isset( $block['attrs']['ref'] ) ) ? $block['attrs']['ref'] : 0;

						if ( $id ) {
							$content = get_post_field( 'post_content', $id );

							$reusable_blocks = $this->parse( $content );

							$assets = $this->get_assets( $reusable_blocks );

							self::$stylesheet .= $assets['css'];
							self::$script     .= $assets['js'];

						}
					} else {

						$block_assets = $this->get_block_css_and_js( $block );
						// Get CSS for the Block.
						$css = $block_assets['css'];

						if ( isset( $css['desktop'] ) ) {
							$desktop .= $css['desktop'];
							$tablet  .= $css['tablet'];
							$mobile  .= $css['mobile'];
						}

						$js .= $block_assets['js'];
					}
				}
			}