<?php
/**
 * Server-Side Gutenberg Block Registration Handler.
 *
 * @package AffiStyle
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Class AffiStyle_Block_Renderer
 *
 * Handles Gutenberg block registration and server-side rendering.
 */
class AffiStyle_Block_Renderer {


	/**
	 * Constructor. Registers hooks.
	 */
	public function __construct() {
		add_action( 'init', array( $this, 'register_block' ) );
	}

	/**
	 * Register the block type and assign its render callback safely.
	 *
	 * Styles are declared via block.json `style` / `editorStyle` keys so that
	 * WordPress automatically injects them into the iframed block editor canvas.
	 * Manual wp_enqueue_style() calls inside render_block() bypass this
	 * mechanism and trigger the "added to the iframe incorrectly" console warning,
	 * so they must NOT be used here.
	 */
	public function register_block() {
		if ( ! function_exists( 'register_block_type' ) ) {
			return;
		}

		if ( class_exists( 'WP_Block_Type_Registry' ) && WP_Block_Type_Registry::get_instance()->is_registered( 'affistyle/aff-box' ) ) {
			return;
		}

		// Register the scoped frontend stylesheet handle on init so WordPress can
		// resolve it when loading assets declared in block.json's "style" field into
		// the iframed editor. Must happen before register_block_type_from_metadata().
		// All rules in this file must be scoped under .affistyle-box-container or
		// .wp-block-affistyle-aff-box to avoid leaking into the admin UI.
		wp_register_style(
			'affistyle-block-frontend-css',
			AFFISTYLE_URL . 'assets/css/affistyle-frontend.css',
			array(),
			AFFISTYLE_VERSION
		);

		// Register the scoped editor-only stylesheet handle on init so block.json's
		// "editorStyle" field injects it into the iframed block canvas.
		// All rules in this file must be scoped under .wp-block-affistyle-aff-box
		// to avoid leaking into the WordPress admin or theme editor UI.
		wp_register_style(
			'affistyle-block-editor-css',
			AFFISTYLE_URL . 'assets/css/affistyle-editor.css',
			array( 'wp-edit-blocks' ),
			AFFISTYLE_VERSION
		);

		// Register the editor script handle on init so block.json's "editorScript"
		// field can resolve it for the classic and iframed block editor.
		wp_register_script(
			'affistyle-block-js',
			AFFISTYLE_URL . 'assets/js/block.js',
			array( 'wp-blocks', 'wp-element', 'wp-block-editor', 'wp-components', 'wp-i18n', 'wp-server-side-render' ),
			AFFISTYLE_VERSION,
			array(
				'strategy'  => 'defer',
				'in_footer' => true,
			)
		);

		if ( class_exists( 'AffiStyle_Database' ) ) {
			wp_localize_script( 'affistyle-block-js', 'affistyle_boxes_list', AffiStyle_Database::get_all_boxes_for_dropdown() );
		}

		// Prefer metadata-driven registration so block.json owns the style/script
		// declarations — WordPress handles iframe injection automatically.
		if ( function_exists( 'register_block_type_from_metadata' ) && file_exists( AFFISTYLE_PATH . 'blocks/block.json' ) ) {
			register_block_type_from_metadata(
				AFFISTYLE_PATH . 'blocks',
				array(
					'render_callback' => array( $this, 'render_block' ),
				)
			);
		} else {
			register_block_type(
				'affistyle/aff-box',
				array(
					'api_version'     => 3,
					'editor_script'   => 'affistyle-block-js',
					'editor_style'    => 'affistyle-block-editor-css',
					'style'           => 'affistyle-block-frontend-css',
					'render_callback' => array( $this, 'render_block' ),
					'attributes'      => array(
						'boxId' => array(
							'type'    => 'string',
							'default' => '',
						),
					),
				)
			);
		}
	}

	/**
	 * Render callback for the Gutenberg block.
	 *
	 * @param array $attributes Block attributes.
	 * @return string
	 */
	public function render_block( $attributes ) {
		$box_id             = isset( $attributes['boxId'] ) ? absint( $attributes['boxId'] ) : 0;
		$is_editor_or_admin = is_admin() || ( defined( 'REST_REQUEST' ) && REST_REQUEST );

		if ( ! $box_id ) {
			if ( $is_editor_or_admin ) {
				return '<div class="affistyle-box-container wp-block-affistyle-aff-box affistyle-placeholder" style="padding: 20px; border: 2px dashed #c3c4c7; text-align: center; color: #646970;">' . esc_html__( 'Please select an Affiliate Box from the block settings panel.', 'affistyle' ) . '</div>';
			}
			return '';
		}

		// Validate that the Affiliate Box exists, is the correct post type, and is published.
		$box_post = get_post( $box_id );
		if ( ! $box_post || 'affistyle_box' !== $box_post->post_type || 'publish' !== $box_post->post_status ) {
			if ( $is_editor_or_admin ) {
				return '<div class="affistyle-box-container wp-block-affistyle-aff-box affistyle-error" style="padding: 20px; border: 2px dashed #dc3232; text-align: center; color: #dc3232;">' . esc_html__( 'Selected Affiliate Box has been moved to trash or deleted.', 'affistyle' ) . '</div>';
			}
			return '';
		}

		if ( ! class_exists( 'AffiStyle_Database' ) ) {
			return '';
		}

		$data = AffiStyle_Database::get_box_data( $box_id );
		if ( ! $data ) {
			if ( $is_editor_or_admin ) {
				return '<div class="affistyle-box-container wp-block-affistyle-aff-box affistyle-error" style="padding: 20px; border: 2px dashed #dc3232; text-align: center; color: #dc3232;">' . esc_html__( 'Selected Affiliate Box has been moved to trash or deleted.', 'affistyle' ) . '</div>';
			}
			return '';
		}

		// Dynamic Template Style Resolution.
		$template_style = ! empty( $data['template_style'] ) ? sanitize_html_class( $data['template_style'] ) : 'style-1';
		$template_file  = apply_filters( 'affistyle_template_file_path', AFFISTYLE_PATH . 'templates/' . $template_style . '.php', $template_style );

		if ( ! file_exists( $template_file ) ) {
			$template_file = AFFISTYLE_PATH . 'templates/style-1.php';
		}

		ob_start();
		if ( file_exists( $template_file ) ) {
			// Include template with $data in scope.
			include $template_file;
			do_action( 'affistyle_box_footer', $box_id );
		}

		return ob_get_clean();
	}

	/**
	 * Backward compatibility alias for render_block.
	 *
	 * @param array $attributes Block attributes.
	 * @return string
	 */
	public function render_callback( $attributes ) {
		return $this->render_block( $attributes );
	}
}

new AffiStyle_Block_Renderer();