<?php

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

if ( ! class_exists( 'Shapla_Structured_Data' ) ) {

	/**
	 * Structured data's handler and generator using JSON-LD format.
	 *
	 * @class   Shapla_Structured_Data
	 * @since   1.0.1
	 * @author  Sayful Islam <sayful.islam001@gmail.com>
	 */
	class Shapla_Structured_Data {

		/**
		 * @var array
		 */
		private $structured_data = array();

		/**
		 * @var array
		 */
		private $breadcrumb_data = array();

		/**
		 * The instance of the class
		 *
		 * @var self
		 */
		private static $instance;

		/**
		 * Only one instance of the class can be loaded
		 *
		 * @return self
		 */
		public static function init() {
			if ( is_null( self::$instance ) ) {
				self::$instance = new self();

				if ( false === shapla_get_option( 'show_structured_data', true ) ) {
					return self::$instance;
				}

				add_action( 'shapla_loop_post', array( self::$instance, 'init_structured_data' ), 40 );
				add_action( 'shapla_single_post', array( self::$instance, 'init_structured_data' ), 40 );
				add_action( 'shapla_page', array( self::$instance, 'init_structured_data' ), 40 );
				add_action( 'shapla_breadcrumb', array( self::$instance, 'generate_breadcrumb_data' ), 10 );

				add_action( 'wp_footer', array( self::$instance, 'get_structured_data' ), 10 );
				add_action( 'wp_footer', array( self::$instance, 'get_breadcrumb_structured_data' ), 10 );
			}

			return self::$instance;
		}

		/**
		 * Generates structured data.
		 *
		 * Hooked into the following action hooks:
		 *
		 * - `shapla_loop_post`
		 * - `shapla_single_post`
		 * - `shapla_page`
		 *
		 * Applies `shapla_structured_data` filter hook for structured data customization :)
		 */
		public function init_structured_data() {

			// Post's structured data.
			if ( is_home() || is_category() || is_date() || is_search() || is_single() && ( shapla_is_woocommerce_activated() && ! is_woocommerce() ) ) {
				$image = wp_get_attachment_image_src( get_post_thumbnail_id( get_the_ID() ), 'normal' );
				$logo  = wp_get_attachment_image_src( shapla_get_option( 'custom_logo' ), 'full' );

				$json['@type'] = 'BlogPosting';

				$json['mainEntityOfPage'] = array(
					'@type' => 'webpage',
					'@id'   => get_the_permalink(),
				);

				if ( $logo ) {
					$json['publisher'] = array(
						'@type' => 'organization',
						'name'  => get_bloginfo( 'name' ),
						'logo'  => array(
							'@type'  => 'ImageObject',
							'url'    => $logo[0],
							'width'  => $logo[1],
							'height' => $logo[2],
						),
					);
				}

				$json['author'] = array(
					'@type' => 'person',
					'name'  => get_the_author(),
				);

				if ( $image ) {
					$json['image'] = array(
						'@type'  => 'ImageObject',
						'url'    => $image[0],
						'width'  => $image[1],
						'height' => $image[2],
					);
				}

				$json['datePublished'] = get_post_time( 'c' );
				$json['dateModified']  = get_the_modified_date( 'c' );
				$json['name']          = get_the_title();
				$json['headline']      = $json['name'];
				$json['description']   = get_the_excerpt();

				// Page's structured data.
			} elseif ( is_page() ) {
				$json['@type']       = 'WebPage';
				$json['url']         = get_the_permalink();
				$json['name']        = get_the_title();
				$json['description'] = get_the_excerpt();
			}

			if ( isset( $json ) ) {
				$this->set_structured_data( apply_filters( 'shapla_structured_data', $json ) );
			}
		}

		/**
		 * Generates BreadcrumbList structured data.
		 *
		 * Hooked into `shapla_breadcrumb` action hook.
		 *
		 * @param \Shapla\Helpers\Breadcrumb $breadcrumbs
		 */
		public function generate_breadcrumb_data( $breadcrumbs ) {
			$crumbs = $breadcrumbs->get_breadcrumb();

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

			$markup                    = array();
			$markup['@type']           = 'BreadcrumbList';
			$markup['itemListElement'] = array();

			foreach ( $crumbs as $key => $crumb ) {
				$markup['itemListElement'][ $key ] = array(
					'@type'    => 'ListItem',
					'position' => $key + 1,
					'item'     => array(
						'name' => $crumb[0],
					),
				);

				if ( ! empty( $crumb[1] ) && sizeof( $crumbs ) !== $key + 1 ) {
					$markup['itemListElement'][ $key ]['item'] += array( '@id' => $crumb[1] );
				}
			}

			$this->set_breadcrumb_structured_data(
				apply_filters(
					'shapla_structured_data_breadcrumb',
					$markup,
					$breadcrumbs
				)
			);
		}

		/**
		 * Sets `$this->structured_data`.
		 *
		 * @param array $json
		 */
		public function set_structured_data( $json ) {
			if ( ! is_array( $json ) ) {
				return;
			}

			$this->structured_data[] = $json;
		}

		/**
		 * Outputs structured data.
		 *
		 * Hooked into `wp_footer` action hook.
		 */
		public function get_structured_data() {
			if ( ! $this->structured_data ) {
				return;
			}

			$structured_data['@context'] = 'https://schema.org/';

			if ( count( $this->structured_data ) > 1 ) {
				$structured_data['@graph'] = $this->structured_data;
			} else {
				$structured_data = $structured_data + $this->structured_data[0];
			}

			echo '<script type="application/ld+json">' . PHP_EOL;
			echo wp_json_encode( $this->sanitize_structured_data( $structured_data ) ) . PHP_EOL;
			echo '</script>' . PHP_EOL;
		}

		/**
		 * Sanitizes structured data.
		 *
		 * @param array $data
		 *
		 * @return array
		 */
		public function sanitize_structured_data( $data ) {
			$sanitized = array();

			foreach ( $data as $key => $value ) {
				if ( is_array( $value ) ) {
					$sanitized_value = $this->sanitize_structured_data( $value );
				} else {
					$sanitized_value = sanitize_text_field( $value );
				}

				$sanitized[ sanitize_text_field( $key ) ] = $sanitized_value;
			}

			return $sanitized;
		}

		/**
		 * Sets `$this->breadcrumb_data`.
		 *
		 * @param array $data
		 */
		private function set_breadcrumb_structured_data( $data ) {

			if ( ! is_array( $data ) ) {
				return;
			}

			$this->breadcrumb_data = $data;
		}

		/**
		 * Outputs breadcrumb structured data.
		 *
		 * Hooked into `wp_footer` action hook.
		 */
		public function get_breadcrumb_structured_data() {

			if ( ! $this->breadcrumb_data ) {
				return;
			}

			$structured_data['@context'] = 'https://schema.org/';
			$structured_data             = $structured_data + $this->breadcrumb_data;

			echo '<script type="application/ld+json">' . PHP_EOL;
			echo wp_json_encode( $this->sanitize_structured_data( $structured_data ) ) . PHP_EOL;
			echo '</script>' . PHP_EOL;
		}

	}
}

Shapla_Structured_Data::init();