<?php
/**
 * Plugin Name:       AgilePress Schema JSON-LD Block
 * Description:       A powerful WordPress block for managing Schema.org structured data markup with template support and dynamic placeholder replacement.
 * Version:           1.0.0
 * Requires at least: 6.1
 * Requires PHP:      7.4
 * Author:            AgilePress
 * License:           GPLv2 or later
 * License URI:       https://www.gnu.org/licenses/gpl-2.0.html
 * Text Domain:       agilepress-schema-json-ld-block
 *
 * @package Agilepress
 */

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

/**
 * Registers the block using the metadata loaded from the `block.json` file.
 */
if ( ! function_exists( 'agilepress_schema_json_ld_block_init' ) ) {
	function agilepress_schema_json_ld_block_init() {
		register_block_type( __DIR__ . '/build/' );
	}
}
add_action( 'init', 'agilepress_schema_json_ld_block_init' );

/**
 * Process placeholders in JSON-LD content.
 *
 * @param string $content The JSON-LD content with placeholders.
 * @return string The processed content with placeholders replaced.
 */
if ( ! function_exists( 'agilepress_schema_process_placeholders' ) ) {
	function agilepress_schema_process_placeholders( $content ) {
		global $post;

		if ( ! $post ) {
			return $content;
		}

		$featured_image = get_the_post_thumbnail_url( $post->ID, 'full' );

		$replacements = array(
			'{{title}}'              => get_the_title( $post->ID ),
			'{{excerpt}}'            => get_the_excerpt( $post->ID ),
			'{{date}}'               => get_the_date( 'c', $post->ID ),
			'{{url}}'                => get_permalink( $post->ID ),
			'{{featured_image_url}}' => $featured_image ? $featured_image : '',
		);

		$content = str_replace( array_keys( $replacements ), array_values( $replacements ), $content );

		$content = preg_replace_callback(
			'/\{\{acf:([a-zA-Z0-9_-]+)\}\}/',
			function ( $matches ) use ( $post ) {
				$field_name = $matches[1];

				if ( ! function_exists( 'get_field' ) ) {
					return '';
				}

				$field_value = get_field( $field_name, $post->ID );

				if ( is_array( $field_value ) ) {
					return wp_json_encode( $field_value );
				} elseif ( is_string( $field_value ) || is_numeric( $field_value ) ) {
					return esc_js( $field_value );
				}

				return '';
			},
			$content
		);

		return $content;
	}
}

/**
 * Output JSON-LD schema in the head section.
 */
if ( ! function_exists( 'agilepress_schema_output_jsonld' ) ) {
	function agilepress_schema_output_jsonld() {
		global $post;

		if ( ! is_singular() || ! $post ) {
			return;
		}

		if ( ! has_blocks( $post->post_content ) ) {
			return;
		}

		$blocks = parse_blocks( $post->post_content );

		foreach ( $blocks as $block ) {
			if ( 'agilepress/block-agilepress-schema-json-ld-block' === $block['blockName'] ) {
				if ( ! empty( $block['attrs']['jsonldContent'] ) ) {
					$jsonld_content = $block['attrs']['jsonldContent'];

					$processed_content = agilepress_schema_process_placeholders( $jsonld_content );

					$decoded = json_decode( $processed_content, true );
					if ( json_last_error() === JSON_ERROR_NONE && is_array( $decoded ) ) {
						$safe_json = wp_json_encode( $decoded );
						if ( $safe_json ) {
							wp_print_inline_script_tag(
								$safe_json,
								array( 'type' => 'application/ld+json' )
							);
						}
					}
				}
			}
		}
	}
}
add_action( 'wp_head', 'agilepress_schema_output_jsonld', 1 );