<?php
namespace Elementor\TemplateLibrary;

use Elementor\Api;
use Elementor\Core\Common\Modules\Ajax\Module as Ajax;
use Elementor\Core\Settings\Manager as SettingsManager;
use Elementor\Includes\TemplateLibrary\Data\Controller;
use Elementor\TemplateLibrary\Classes\Import_Images;
use Elementor\Plugin;
use Elementor\User;
use Elementor\Utils;

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

/**
 * Elementor template library manager.
 *
 * Elementor template library manager handler class is responsible for
 * initializing the template library.
 *
 * @since 1.0.0
 */
class Manager {

	/**
	 * Registered template sources.
	 *
	 * Holds a list of all the supported sources with their instances.
	 *
	 * @access protected
	 *
	 * @var Source_Base[]
	 */
	protected $_registered_sources = []; // phpcs:ignore PSR2.Classes.PropertyDeclaration.Underscore

	/**
	 * Imported template images.
	 *
	 * Holds an instance of `Import_Images` class.
	 *
	 * @access private
	 *
	 * @var Import_Images
	 */
	private $_import_images = null; // phpcs:ignore PSR2.Classes.PropertyDeclaration.Underscore

	/**
	 * Template library manager constructor.
	 *
	 * Initializing the template library manager by registering default template
	 * sources and initializing ajax calls.
	 *
	 * @since 1.0.0
	 * @access public
	 */
	public function __construct() {
		Plugin::$instance->data_manager_v2->register_controller( new Controller() );

		$this->register_default_sources();

		$this->add_actions();
	}

	/**
	 * @since 2.3.0
	 * @access public
	 */
	public function add_actions() {
		add_action( 'elementor/ajax/register_actions', [ $this, 'register_ajax_actions' ] );
		add_action( 'wp_ajax_elementor_library_direct_actions', [ $this, 'handle_direct_actions' ] );
	}

	/**
	 * Get `Import_Images` instance.
	 *
	 * Retrieve the instance of the `Import_Images` class.
	 *
	 * @since 1.0.0
	 * @access public
	 *
	 * @return Import_Images Imported images instance.
	 */
	public function get_import_images_instance() {
		if ( null === $this->_import_images ) {
			$this->_import_images = new Import_Images();
		}

		return $this->_import_images;
	}

	/**
	 * Register template source.
	 *
	 * Used to register new template sources displayed in the template library.
	 *
	 * @since 1.0.0
	 * @access public
	 *
	 * @param string $source_class The name of source class.
	 * @param array  $args         Optional. Class arguments. Default is an
	 *                             empty array.
	 *
	 * @return \WP_Error|true True if the source was registered, `WP_Error`
	 *                        otherwise.
	 */
	public function register_source( $source_class, $args = [] ) {
		if ( ! class_exists( $source_class ) ) {
			return new \WP_Error( 'source_class_name_not_exists' );
		}

		$source_instance = new $source_class( $args );

		if ( ! $source_instance instanceof Source_Base ) {
			return new \WP_Error( 'wrong_instance_source' );
		}

		$source_id = $source_instance->get_id();

		if ( isset( $this->_registered_sources[ $source_id ] ) ) {
			return new \WP_Error( 'source_exists' );
		}

		$this->_registered_sources[ $source_id ] = $source_instance;

		return true;
	}

	/**
	 * Unregister template source.
	 *
	 * Remove an existing template sources from the list of registered template
	 * sources.
	 *
	 * @since 1.0.0
	 * @deprecated 2.7.0
	 * @access public
	 *
	 * @param string $id The source ID.
	 *
	 * @return bool Whether the source was unregistered.
	 */
	public function unregister_source( $id ) {
		return true;
	}

	/**
	 * Get registered template sources.
	 *
	 * Retrieve registered template sources.
	 *
	 * @since 1.0.0
	 * @access public
	 *
	 * @return Source_Base[] Registered template sources.
	 */
	public function get_registered_sources() {
		return $this->_registered_sources;
	}

	/**
	 * Get template source.
	 *
	 * Retrieve single template sources for a given template ID.
	 *
	 * @since 1.0.0
	 * @access public
	 *
	 * @param string $id The source ID.
	 *
	 * @return false|Source_Base Template sources if one exist, False otherwise.
	 */
	public function get_source( $id ) {
		$sources = $this->get_registered_sources();

		if ( ! isset( $sources[ $id ] ) ) {
			return false;
		}

		return $sources[ $id ];
	}

	/**
	 * Get templates.
	 *
	 * Retrieve all the templates from all the registered sources.
	 *
	 * @param array $filter_sources
	 * @param bool $force_update
	 * @return array
	 */
	public function get_templates( array $filter_sources = [], bool $force_update = false ): array {
		$templates = [];

		foreach ( $this->get_registered_sources() as $source ) {
			if ( ! empty( $filter_sources ) && ! in_array( $source->get_id(), $filter_sources, true ) ) {
				continue;
			}

			$templates = array_merge( $templates, $source->get_items( [ 'force_update' => $force_update ] ) );
		}

		return $templates;
	}

	/**
	 * Get library data.
	 *
	 * Retrieve the library data.
	 *
	 * @since 1.9.0
	 * @access public
	 *
	 * @param array $args Library arguments.
	 *
	 * @return array Library data.
	 */
	public function get_library_data( array $args ) {
		$library_data = Api::get_library_data( ! empty( $args['sync'] ) );

		if ( empty( $library_data ) ) {
			return $library_data;
		}

		// Ensure all document are registered.
		Plugin::$instance->documents->get_document_types();

		$filter_sources = ! empty( $args['filter_sources'] ) ? $args['filter_sources'] : [];
		$force_update = ! empty( $args['sync'] );

		return [
			'templates' => $this->get_templates( $filter_sources, $force_update ),
			'config' => $library_data['types_data'],
		];
	}

	/**
	 * Save template.
	 *
	 * Save new or update existing template on the database.
	 *
	 * @since 1.0.0
	 * @access public
	 *
	 * @param array $args Template arguments.
	 *
	 * @return \WP_Error|int The ID of the saved/updated template.
	 */
	public function save_template( array $args ) {
		$validate_args = $this->ensure_args( [ 'post_id', 'source', 'content', 'type' ], $args );

		if ( is_wp_error( $validate_args ) ) {
			return $validate_args;
		}

		$source = $this->get_source( $args['source'] );

		if ( ! $source ) {
			return new \WP_Error( 'template_error', 'Template source not found.' );
		}

		$args['content'] = json_decode( $args['content'], true );

		$page = SettingsManager::get_settings_managers( 'page' )->get_model( $args['post_id'] );

		$args['page_settings'] = $page->get_data( 'settings' );

		$template_id = $source->save_item( $args );

		if ( is_wp_error( $template_id ) ) {
			return $template_id;
		}

		return $source->get_item( $template_id );
	}

	/**
	 * Update template.
	 *
	 * Update template on the database.
	 *
	 * @since 1.0.0
	 * @access public
	 *
	 * @param array $template_data New template data.
	 *
	 * @return \WP_Error|Source_Base Template sources instance if the templates
	 *                               was updated, `WP_Error` otherwise.
	 */
	public function update_template( array $template_data ) {
		$validate_args = $this->ensure_args( [ 'source', 'content', 'type' ], $template_data );

		if ( is_wp_error( $validate_args ) ) {
			return $validate_args;
		}

		$source = $this->get_source( $template_data['source'] );

		if ( ! $source ) {
			return new \WP_Error( 'template_error', 'Template source not found.' );
		}

		$template_data['content'] = json_decode( $template_data['content'], true );

		$update = $source->update_item( $template_data );

		if ( is_wp_error( $update ) ) {
			return $update;
		}

		return $source->get_item( $template_data['id'] );
	}

	/**
	 * Update templates.
	 *
	 * Update template on the database.
	 *
	 * @since 1.0.0
	 * @access public
	 *
	 * @param array $args Template arguments.
	 *
	 * @return \WP_Error|true True if templates updated, `WP_Error` otherwise.
	 */
	public function update_templates( array $args ) {
		foreach ( $args['templates'] as $template_data ) {
			$result = $this->update_template( $template_data );

			if ( is_wp_error( $result ) ) {
				return $result;
			}
		}

		return true;
	}

	/**
	 * Get template data.
	 *
	 * Retrieve the template data.
	 *
	 * @since 1.5.0
	 * @access public
	 *
	 * @param array $args Template arguments.
	 *
	 * @return \WP_Error|bool|array ??
	 */
	public function get_template_data( array $args ) {
		$validate_args = $this->ensure_args( [ 'source', 'template_id' ], $args );

		if ( is_wp_error( $validate_args ) ) {
			return $validate_args;
		}

		if ( isset( $args['edit_mode'] ) ) {
			Plugin::$instance->editor->set_edit_mode( $args['edit_mode'] );
		}

		$source = $this->get_source( $args['source'] );

		if ( ! $source ) {
			return new \WP_Error( 'template_error', 'Template source not found.' );
		}

		do_action( 'elementor/template-library/before_get_source_data', $args, $source );

		$data = $source->get_data( $args );

		do_action( 'elementor/template-library/after_get_source_data', $args, $source );

		return $data;
	}

	/**
	 * Delete template.
	 *
	 * Delete template from the database.
	 *
	 * @since 1.0.0
	 * @access public
	 *
	 * @param array $args Template arguments.
	 *
	 * @return \WP_Post|\WP_Error|false|null Post data on success, false or null
	 *                                       or 'WP_Error' on failure.
	 */
	public function delete_template( array $args ) {
		$validate_args = $this->ensure_args( [ 'source', 'template_id' ], $args );

		if ( is_wp_error( $validate_args ) ) {
			return $validate_args;
		}

		$source = $this->get_source( $args['source'] );

		if ( ! $source ) {
			return new \WP_Error( 'template_error', 'Template source not found.' );
		}

		return $source->delete_template( $args['template_id'] );
	}

	/**
	 * Export template.
	 *
	 * Export template to a file after ensuring it is a valid Elementor template
	 * and checking user permissions for private posts.
	 *
	 * @since 1.0.0
	 * @access public
	 *
	 * @param array $args Template arguments.
	 *
	 * @return mixed Whether the export succeeded or failed.
	 */
	public function export_template( array $args ) {
		$validate_args = $this->ensure_args( [ 'source', 'template_id' ], $args );

		if ( is_wp_error( $validate_args ) ) {
			return $validate_args;
		}

		$post_id = intval( $args['template_id'] );
		$post_status = get_post_status( $post_id );

		if ( get_post_type( $post_id ) !== Source_Local::CPT ) {
			return new \WP_Error( 'template_error', esc_html__( 'Invalid template type or template does not exist.', 'elementor' ) );
		}

		if ( 'private' === $post_status && ! current_user_can( 'read_private_posts', $post_id ) ) {
			return new \WP_Error( 'template_error', esc_html__( 'You do not have permission to access this template.', 'elementor' ) );
		}

		if ( 'publish' !== $post_status && ! current_user_can( 'edit_post', $post_id ) ) {
			return new \WP_Error( 'template_error', esc_html__( 'You do not have permission to export this template.', 'elementor' ) );
		}

		$source = $this->get_source( $args['source'] );

		if ( ! $source ) {
			return new \WP_Error( 'template_error', 'Template source not found' );
		}

		return $source->export_template( $args['template_id'] );
	}

	/**
	 * @since 2.3.0
	 * @access public
	 */
	public function direct_import_template() {
		/** @var Source_Local $source */
		$source = $this->get_source( 'local' );
		$file = Utils::get_super_global_value( $_FILES, 'file' );
		return $source->import_template( $file['name'], $file['tmp_name'] );
	}

	/**
	 * Import template.
	 *
	 * Import template from a file.
	 *
	 * @since 1.0.0
	 * @access public
	 *
	 * @param array $data
	 *
	 * @return mixed Whether the export succeeded or failed.
	 */
	public function import_template( array $data ) {
		// If the template is a JSON file, allow uploading it.
		add_filter( 'elementor/files/allow-file-type/json', [ $this, 'enable_json_template_upload' ] );
		add_filter( 'elementor/files/allow_unfiltered_upload', [ $this, 'enable_json_template_upload' ] );

		// Imported templates can be either JSON files, or Zip files containing multiple JSON files
		$upload_result = Plugin::$instance->uploads_manager->handle_elementor_upload( $data, [ 'zip', 'json' ] );

		remove_filter( 'elementor/files/allow-file-type/json', [ $this, 'enable_json_template_upload' ] );
		remove_filter( 'elementor/files/allow_unfiltered_upload', [ $this, 'enable_json_template_upload' ] );

		if ( is_wp_error( $upload_result ) ) {
			Plugin::$instance->uploads_manager->remove_file_or_dir( dirname( $upload_result['tmp_name'] ) );

			return $upload_result;
		}

		/** @var Source_Local $source_local */
		$source_local = $this->get_source( 'local' );

		$import_result = $source_local->import_template( $upload_result['name'], $upload_result['tmp_name'] );

		// Remove the temporary directory generated for the stream-uploaded file.
		Plugin::$instance->uploads_manager->remove_file_or_dir( dirname( $upload_result['tmp_name'] ) );

		return $import_result;
	}

	/**
	 * Enable JSON Template Upload
	 *
	 * Runs on the 'elementor/files/allow-file-type/json' Uploads Manager filter.
	 *
	 * @since 3.5.0
	 * @access public
	 *
	 * return bool
	 */
	public function enable_json_template_upload() {
		return true;
	}

	/**
	 * Mark template as favorite.
	 *
	 * Add the template to the user favorite templates.
	 *
	 * @since 1.9.0
	 * @access public
	 *
	 * @param array $args Template arguments.
	 *
	 * @return mixed Whether the template marked as favorite.
	 */
	public function mark_template_as_favorite( $args ) {
		$validate_args = $this->ensure_args( [ 'source', 'template_id', 'favorite' ], $args );

		if ( is_wp_error( $validate_args ) ) {
			return $validate_args;
		}

		$source = $this->get_source( $args['source'] );

		return $source->mark_as_favorite( $args['template_id'], filter_var( $args['favorite'], FILTER_VALIDATE_BOOLEAN ) );
	}

	public function import_from_json( array $args ) {
		$validate_args = $this->ensure_args( [ 'editor_post_id', 'elements' ], $args );

		if ( is_wp_error( $validate_args ) ) {
			return $validate_args;
		}

		$elements = json_decode( $args['elements'], true );

		$document = Plugin::$instance->documents->get( $args['editor_post_id'] );
		if ( ! $document ) {
			return new \WP_Error( 'template_error', 'Document not found.' );
		}

		$import_data = $document->get_import_data( [ 'content' => $elements ] );

		return $import_data['content'];
	}

	/**
	 * Register default template sources.
	 *
	 * Register the 'local' and 'remote' template sources that Elementor use by
	 * default.
	 *
	 * @since 1.0.0
	 * @access private
	 */
	private function register_default_sources() {
		$sources = [
			'local',
			'remote',
		];

		foreach ( $sources as $source_filename ) {
			$class_name = ucwords( $source_filename );
			$class_name = str_replace( '-', '_', $class_name );

			$this->register_source( __NAMESPACE__ . '\Source_' . $class_name );
		}
	}

	/**
	 * Handle ajax request.
	 *
	 * Fire authenticated ajax actions for any given ajax request.
	 *
	 * @since 1.0.0
	 * @access private
	 *
	 * @param string $ajax_request Ajax request.
	 *
	 * @param array $data
	 *
	 * @return mixed
	 * @throws \Exception
	 */
	private function handle_ajax_request( $ajax_request, array $data ) {
		if ( ! User::is_current_user_can_edit_post_type( Source_Local::CPT ) ) {
			throw new \Exception( 'Access denied.' );
		}

		if ( ! empty( $data['editor_post_id'] ) ) {
			$editor_post_id = absint( $data['editor_post_id'] );

			if ( ! get_post( $editor_post_id ) ) {
				throw new \Exception( 'Post not found.' );
			}

			Plugin::$instance->db->switch_to_post( $editor_post_id );
		}

		$result = call_user_func( [ $this, $ajax_request ], $data );

		if ( is_wp_error( $result ) ) {
			throw new \Exception( $result->get_error_message() );
		}

		return $result;
	}

	/**
	 * Init ajax calls.
	 *
	 * Initialize template library ajax calls for allowed ajax requests.
	 *
	 * @since 2.3.0
	 * @access public
	 *
	 * @param Ajax $ajax
	 */
	public function register_ajax_actions( Ajax $ajax ) {
		$library_ajax_requests = [
			'get_library_data',
			'get_template_data',
			'save_template',
			'update_templates',
			'delete_template',
			'import_template',
			'mark_template_as_favorite',
			'import_from_json',
		];

		foreach ( $library_ajax_requests as $ajax_request ) {
			$ajax->register_ajax_action( $ajax_request, function( $data ) use ( $ajax_request ) {
				return $this->handle_ajax_request( $ajax_request, $data );
			} );
		}
	}

	/**
	 * @since 2.3.0
	 * @access public
	 */
	public function handle_direct_actions() {
		if ( ! User::is_current_user_can_edit_post_type( Source_Local::CPT ) ) {
			return;
		}

		/** @var Ajax $ajax */
		$ajax = Plugin::$instance->common->get_component( 'ajax' );

		if ( ! $ajax->verify_request_nonce() ) {
			$this->handle_direct_action_error( 'Access Denied' );
		}

		$action = Utils::get_super_global_value( $_REQUEST, 'library_action' ); // phpcs:ignore -- Nonce already verified.

		$whitelist_methods = [
			'export_template',
			'direct_import_template',
		];

		if ( in_array( $action, $whitelist_methods, true ) ) {
			$result = $this->$action( $_REQUEST ); // phpcs:ignore -- Nonce already verified.
		} else {
			$result = new \WP_Error( 'method_not_exists', 'Method Not exists' );
		}

		if ( is_wp_error( $result ) ) {
			/** @var \WP_Error $result */
			$this->handle_direct_action_error( $result->get_error_message() . '.' );
		}

		$callback = "on_{$action}_success";

		if ( method_exists( $this, $callback ) ) {
			$this->$callback( $result );
		}

		die;
	}

	/**
	 * On successful template import.
	 *
	 * Redirect the user to the template library after template import was
	 * successful finished.
	 *
	 * @since 2.3.0
	 * @access private
	 */
	private function on_direct_import_template_success() {
		wp_safe_redirect( admin_url( Source_Local::ADMIN_MENU_SLUG ) );
	}

	/**
	 * @since 2.3.0
	 * @access private
	 */
	private function handle_direct_action_error( $message ) {
		_default_wp_die_handler( $message, 'Elementor Library' );
	}

	/**
	 * Ensure arguments exist.
	 *
	 * Checks whether the required arguments exist in the specified arguments.
	 *
	 * @since 1.0.0
	 * @access private
	 *
	 * @param array $required_args  Required arguments to check whether they
	 *                              exist.
	 * @param array $specified_args The list of all the specified arguments to
	 *                              check against.
	 *
	 * @return \WP_Error|true True on success, 'WP_Error' otherwise.
	 */
	private function ensure_args( array $required_args, array $specified_args ) {
		$not_specified_args = array_diff( $required_args, array_keys( $specified_args ) );

		if ( $not_specified_args ) {
			return new \WP_Error( 'arguments_not_specified', sprintf( 'The required argument(s) "%s" not specified.', implode( ', ', $not_specified_args ) ) );
		}

		return true;
	}
}

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