<?php
/**
 * Provide Import and Export of the settings of the plugin.
 *
 * This is a fork from
 * https://github.com/Mte90/WordPress-Plugin-Boilerplate-Powered of Mte90
 *
 * @since 2.2.0
 *
 * @package ItalyStrap
 */

namespace ItalyStrap\Import_Export;

if ( ! defined( 'ABSPATH' ) or ! ABSPATH ) {
	die();
}

use ItalyStrap\Event\Subscriber_Interface;

/**
 * Import Export Class
 */
class Import_Export extends Import_Export_Base implements Subscriber_Interface {

	/**
	 * Returns an array of hooks that this subscriber wants to register with
	 * the WordPress plugin API.
	 *
	 * @hooked italystrap_after_settings_page - 10
	 *
	 * @return array
	 */
	public static function get_subscribed_events() {

		return array(
			// 'hook_name'							=> 'method_name',
			'italystrap_after_settings_page'	=> 'get_view',
			'admin_init'						=> 'export',
			'admin_init'						=> 'import',
		);
	}

	/**
	 * Process a settings export from config
	 *
	 * @since    2.2.0
	 */
	public function export() {

		if ( ! $this->is_allowed( 'export' ) ) {
			return;
		}

		foreach ( (array) $this->args['options_names'] as $options_name ) {
			$this->settings[ $options_name ] = get_option( $options_name );
		}

		ignore_user_abort( true );

		nocache_headers();

		/**
		 * date_default_timezone_set('UTC');
		 */
		header( 'Content-Type: application/json; charset=utf-8' );
		header(
			sprintf(
				'Content-Disposition: attachment; filename=%s-%s.json',
				$this->args['filename'],
				$this->get_date_time_string()
			)
		);
		header( 'Expires: 0' );

		if ( is_callable( 'wp_json_encode' ) ) {
			echo wp_json_encode( $this->settings, JSON_PRETTY_PRINT );
			exit;
		}

		echo json_encode( $this->settings );
		exit;
	}

	/**
	 * Process a settings import from a json file
	 *
	 * @since    2.2.0
	 */
	public function import() {

		if ( ! $this->is_allowed( 'import' ) ) {
			return;
		}

		/**
		 * Get the extension of import file
		 *
		 * @link http://stackoverflow.com/a/19831453 Strict standards: Only variables should be passed by reference
		 * @var string
		 */
		$file_name = $_FILES[ $this->args['import_file'] ]['name']; // WPCS: input var okay.
		$exploded = explode( '.', $file_name );
		$extension = end( $exploded );

		/**
		 * If it is not json than die
		 */
		if ( 'json' !== $extension ) {
			wp_die(
				$this->i18n['no_json_file']['message'],
				$this->i18n['no_json_file']['title'],
				array( 'back_link' => true )
			);
		}

		/**
		 * If the file is empty than die
		 */
		if ( 0 === $_FILES[ $this->args['import_file'] ]['size'] ) { // WPCS: input var okay.
			wp_die(
				$this->i18n['zero_size']['message'],
				$this->i18n['zero_size']['title'],
				array( 'back_link' => true )
			);
		}

		$import_file = $_FILES[ $this->args['import_file'] ]['tmp_name']; // WPCS: input var okay.

		/**
		 * If $import_file is empty or null than die
		 */
		if ( empty( $import_file ) ) {
			wp_die(
				$this->i18n['no_file']['message'],
				$this->i18n['no_file']['title'],
				array( 'back_link' => true )
			);
		}

		/**
		 * Retrieve the settings from the file and convert the json object to an array.
		 *
		 * @var array
		 */
		$settings = (array) json_decode( file_get_contents( $import_file ) );

		foreach ( (array) $this->args['options_names'] as $options_name ) {
			update_option( $options_name, get_object_vars( $settings[ $options_name ] ) );
		}

		$url = isset( $_SERVER['HTTP_REFERER'] ) ? esc_url( $_SERVER['HTTP_REFERER'] ) : network_admin_url(); // WPCS: input var okay.

		wp_safe_redirect( $url );
		exit;
	}
}