<?php

class Jetpack_Sync_Module_Import extends Jetpack_Sync_Module {

	private $import_end = false;

	public function name() {
		return 'import';
	}

	public function init_listeners( $callable ) {
		add_action( 'export_wp', $callable );
		add_action( 'jetpack_sync_import_end', $callable, 10, 2 );

		// Movable type, RSS, Livejournal
		add_action( 'import_done', array( $this, 'sync_import_done' ) );

		// WordPress, Blogger, Livejournal, woo tax rate
		add_action( 'import_end', array( $this, 'sync_import_end' ) );
	}

	public function set_defaults() {
		$this->import_end = false;
	}

	public function sync_import_done( $importer ) {
		// We already ran an send the import
		if ( $this->import_end ) {
			return;
		}

		$importer_name = $this->get_importer_name( $importer );

		/**
		 * Sync Event that tells that the import is finished
		 *
		 * @since 5.0.0
		 *
		 * $param string $importer
		 */
		do_action( 'jetpack_sync_import_end', $importer, $importer_name );
		$this->import_end = true;
	}

	public function sync_import_end() {
		// We already ran an send the import
		if ( $this->import_end ) {
			return;
		}

		$this->import_end = true;
		$importer         = 'unknown';
		$backtrace        = wp_debug_backtrace_summary( null, 0, false );
		if ( $this->is_importer( $backtrace, 'Blogger_Importer' ) ) {
			$importer = 'blogger';
		}

		if ( 'unknown' === $importer && $this->is_importer( $backtrace, 'WC_Tax_Rate_Importer' ) ) {
			$importer = 'woo-tax-rate';
		}

		if ( 'unknown' === $importer && $this->is_importer( $backtrace, 'WP_Import' ) ) {
			$importer = 'wordpress';
		}

		$importer_name = $this->get_importer_name( $importer );

		/** This filter is already documented in sync/class.jetpack-sync-module-posts.php */
		do_action( 'jetpack_sync_import_end', $importer, $importer_name );
	}

	private function get_importer_name( $importer ) {
		$importers = get_importers();
		return isset( $importers[ $importer ] ) ? $importers[ $importer ][0] : 'Unknown Importer';
	}

	private function is_importer( $backtrace, $class_name ) {
		foreach ( $backtrace as $trace ) {
			if ( strpos( $trace, $class_name ) !== false ) {
				return true;
			}
		}

		return false;
	}
}