<?php

/**
 * Allows plugins to use their own update API.
 *
 * @author Easy Digital Downloads
 * @version 1.6.17
 */
class WPPopups_Updater {
	private $remote_url = '';
	private $api_data = [];
	private $plugin_name = '';
	private $plugin_slug = '';
	private $plugin_url = '';
	private $key = '';
	private $version = '';
	private $wp_override = false;
	private $cache_key = '';
	private $health_check_timeout = 5;

	/**
	 * @var bool
	 */
	private $beta;

	/**
	 * Class constructor.
	 *
	 * @param array $config
	 *
	 * @uses hook()
	 *
	 * @uses plugin_basename()
	 */
	public function __construct( array $config ) {

		// Set class properties.
		$accepted_args = array(
			'plugin_name',
			'plugin_slug',
			'plugin_url',
			'remote_url',
			'version',
			'key',
		);

		foreach ( $accepted_args as $arg ) {
			if( isset($config[ $arg ]) ) {
				$this->$arg = $config[ $arg ];
			}
		}
		global $edd_plugin_data;
		$this->api_data                 = $config;
		$this->beta                     = ! empty( $this->api_data['beta'] ) ? true : false;
		$this->cache_key                = 'wpp_sl_' . md5( serialize( $this->plugin_slug . $this->key . $this->beta ) );
		$edd_plugin_data[ $this->plugin_slug ] = $this->api_data;
		/**
		 * Fires after the $edd_plugin_data is setup.
		 *
		 * @param array $edd_plugin_data Array of EDD SL plugin data.
		 *
		 * @since x.x.x
		 *
		 */
		do_action( 'post_edd_sl_plugin_updater_setup', $edd_plugin_data );
		// Set up hooks.
		$this->init();
	}

	/**
	 * Set up WordPress filters to hook into WP's update process.
	 *
	 * @return void
	 * @uses add_filter()
	 *
	 */
	public function init() {
		add_filter( 'pre_set_site_transient_update_plugins', [ $this, 'check_update' ] );
		add_filter( 'plugins_api', [ $this, 'plugins_api_filter' ], 10, 3 );
		remove_action( 'after_plugin_row_' . $this->plugin_name, 'wp_plugin_update_row', 10 );
		add_action( 'after_plugin_row_' . $this->plugin_name, [ $this, 'show_update_notification' ], 10, 2 );
		add_action( 'admin_init', [ $this, 'show_changelog' ] );
	}

	/**
	 * Check for Updates at the defined API endpoint and modify the update array.
	 *
	 * This function dives into the update API just when WordPress creates its update array,
	 * then adds a custom API call and injects the custom plugin data retrieved from the API.
	 * It is reassembled from parts of the native WordPress plugin update code.
	 * See wp-includes/update.php line 121 for the original wp_update_plugins() function.
	 *
	 * @param array $_transient_data Update array build by WordPress.
	 *
	 * @return array Modified update array with custom plugin data.
	 * @uses api_request()
	 *
	 */
	public function check_update( $_transient_data ) {
		global $pagenow;
		if ( ! is_object( $_transient_data ) ) {
			$_transient_data = new stdClass;
		}
		if ( 'plugins.php' == $pagenow && is_multisite() ) {
			return $_transient_data;
		}
		if ( ! empty( $_transient_data->response ) && ! empty( $_transient_data->response[ $this->plugin_name ] ) && false === $this->wp_override ) {
			return $_transient_data;
		}
		$version_info = $this->get_cached_version_info();
		if ( false === $version_info ) {
			$version_info = $this->api_request( 'plugin_latest_version', [
				'slug' => $this->plugin_slug,
				'beta' => $this->beta,
			] );
			$this->set_version_info_cache( $version_info );
		}

		if ( false !== $version_info && is_object( $version_info ) && isset( $version_info->new_version ) ) {
			if ( version_compare( $this->version, $version_info->new_version, '<' ) ) {
				$_transient_data->response[ $this->plugin_name ] = $version_info;
			}
			$_transient_data->last_checked           = time();
			$_transient_data->checked[ $this->plugin_name ] = $this->version;
		}

		return $_transient_data;
	}

	/**
	 * show update nofication row -- needed for multisite subsites, because WP won't tell you otherwise!
	 *
	 * @param string $file
	 * @param array $plugin
	 */
	public function show_update_notification( $file, $plugin ) {
		if ( is_network_admin() ) {
			return;
		}
		if ( ! current_user_can( 'update_plugins' ) ) {
			return;
		}
		if ( ! is_multisite() ) {
			return;
		}
		if ( $this->plugin_name != $file ) {
			return;
		}
		// Remove our filter on the site transient
		remove_filter( 'pre_set_site_transient_update_plugins', [ $this, 'check_update' ], 10 );
		$update_cache = get_site_transient( 'update_plugins' );
		$update_cache = is_object( $update_cache ) ? $update_cache : new stdClass();
		if ( empty( $update_cache->response ) || empty( $update_cache->response[ $this->plugin_name ] ) ) {
			$version_info = $this->get_cached_version_info();
			if ( false === $version_info ) {
				$version_info = $this->api_request( 'plugin_latest_version', [
					'slug' => $this->plugin_slug,
					'beta' => $this->beta,
				] );
				// Since we disabled our filter for the transient, we aren't running our object conversion on banners, sections, or icons. Do this now:
				if ( isset( $version_info->banners ) && ! is_array( $version_info->banners ) ) {
					$version_info->banners = $this->convert_object_to_array( $version_info->banners );
				}
				if ( isset( $version_info->sections ) && ! is_array( $version_info->sections ) ) {
					$version_info->sections = $this->convert_object_to_array( $version_info->sections );
				}
				if ( isset( $version_info->icons ) && ! is_array( $version_info->icons ) ) {
					$version_info->icons = $this->convert_object_to_array( $version_info->icons );
				}
				$this->set_version_info_cache( $version_info );
			}
			if ( ! is_object( $version_info ) ) {
				return;
			}
			if ( version_compare( $this->version, $version_info->new_version, '<' ) ) {
				$update_cache->response[ $this->plugin_name ] = $version_info;
			}
			$update_cache->last_checked           = time();
			$update_cache->checked[ $this->plugin_name ] = $this->version;
			set_site_transient( 'update_plugins', $update_cache );
		} else {
			$version_info = $update_cache->response[ $this->plugin_name ];
		}
		// Restore our filter
		add_filter( 'pre_set_site_transient_update_plugins', [ $this, 'check_update' ] );
		if ( ! empty( $update_cache->response[ $this->plugin_name ] ) && version_compare( $this->version, $version_info->new_version, '<' ) ) {
			// build a plugin list row, with update notification
			$wp_list_table = _get_list_table( 'WP_Plugins_List_Table' );
			# <tr class="plugin-update-tr"><td colspan="' . $wp_list_table->get_column_count() . '" class="plugin-update colspanchange">
			echo '<tr class="plugin-update-tr" id="' . $this->plugin_slug . '-update" data-slug="' . $this->plugin_slug . '" data-plugin="' . $this->plugin_slug . '/' . $file . '">';
			echo '<td colspan="3" class="plugin-update colspanchange">';
			echo '<div class="update-message notice inline notice-warning notice-alt">';
			$changelog_link = self_admin_url( 'index.php?edd_sl_action=view_plugin_changelog&plugin=' . $this->plugin_name . '&slug=' . $this->plugin_slug . '&TB_iframe=true&width=772&height=911' );
			if ( empty( $version_info->download_link ) ) {
				printf(
					__( 'There is a new version of %1$s available. %2$sView version %3$s details%4$s.', 'easy-digital-downloads' ),
					esc_html( $version_info->name ),
					'<a target="_blank" class="thickbox" href="' . esc_url( $changelog_link ) . '">',
					esc_html( $version_info->new_version ),
					'</a>'
				);
			} else {
				printf(
					__( 'There is a new version of %1$s available. %2$sView version %3$s details%4$s or %5$supdate now%6$s.', 'easy-digital-downloads' ),
					esc_html( $version_info->name ),
					'<a target="_blank" class="thickbox" href="' . esc_url( $changelog_link ) . '">',
					esc_html( $version_info->new_version ),
					'</a>',
					'<a href="' . esc_url( wp_nonce_url( self_admin_url( 'update.php?action=upgrade-plugin&plugin=' ) . $this->plugin_name, 'upgrade-plugin_' . $this->plugin_name ) ) . '">',
					'</a>'
				);
			}
			do_action( "in_plugin_update_message-{$file}", $plugin, $version_info );
			echo '</div></td></tr>';
		}
	}

	/**
	 * Updates information on the "View version x.x details" page with custom data.
	 *
	 * @param mixed $_data
	 * @param string $_action
	 * @param object $_args
	 *
	 * @return object $_data
	 * @uses api_request()
	 *
	 */
	public function plugins_api_filter( $_data, $_action = '', $_args = null ) {
		if ( $_action != 'plugin_information' ) {
			return $_data;
		}
		if ( ! isset( $_args->slug ) || ( $_args->slug != $this->plugin_slug ) ) {
			return $_data;
		}
		$to_send   = [
			'slug'   => $this->plugin_slug,
			'is_ssl' => is_ssl(),
			'fields' => [
				'banners' => [],
				'reviews' => false,
				'icons'   => [],
			],
		];
		$cache_key = 'wpp_api_request_' . md5( serialize( $this->plugin_slug . $this->api_data['key'] . $this->beta ) );
		// Get the transient where we store the api request for this plugin for 24 hours
		$wpp_api_request_transient = $this->get_cached_version_info( $cache_key );
		//If we have no transient-saved value, run the API, set a fresh transient with the API value, and return that value too right now.
		if ( empty( $wpp_api_request_transient ) ) {
			$api_response = $this->api_request( 'plugin_information', $to_send );
			// Expires in 3 hours
			$this->set_version_info_cache( $api_response, $cache_key );
			if ( false !== $api_response ) {
				$_data = $api_response;
			}
		} else {
			$_data = $wpp_api_request_transient;
		}
		// Convert sections into an associative array, since we're getting an object, but Core expects an array.
		if ( isset( $_data->sections ) && ! is_array( $_data->sections ) ) {
			$_data->sections = $this->convert_object_to_array( $_data->sections );
		}
		// Convert banners into an associative array, since we're getting an object, but Core expects an array.
		if ( isset( $_data->banners ) && ! is_array( $_data->banners ) ) {
			$_data->banners = $this->convert_object_to_array( $_data->banners );
		}
		// Convert icons into an associative array, since we're getting an object, but Core expects an array.
		if ( isset( $_data->icons ) && ! is_array( $_data->icons ) ) {
			$_data->icons = $this->convert_object_to_array( $_data->icons );
		}

		return $_data;
	}

	/**
	 * Convert some objects to arrays when injecting data into the update API
	 *
	 * Some data like sections, banners, and icons are expected to be an associative array, however due to the JSON
	 * decoding, they are objects. This method allows us to pass in the object and return an associative array.
	 *
	 * @param stdClass $data
	 *
	 * @return array
	 * @since 2.0.0
	 *
	 */
	private function convert_object_to_array( $data ) {
		$new_data = [];
		foreach ( $data as $key => $value ) {
			$new_data[ $key ] = $value;
		}

		return $new_data;
	}

	/**
	 * Disable SSL verification in order to prevent download update failures
	 *
	 * @param array $args
	 * @param string $url
	 *
	 * @return object $array
	 */
	public function http_request_args( $args, $url ) {
		$verify_ssl = $this->verify_ssl();
		if ( strpos( $url, 'https://' ) !== false && strpos( $url, 'edd_action=package_download' ) ) {
			$args['sslverify'] = $verify_ssl;
		}

		return $args;
	}

	/**
	 * Calls the API and, if successfull, returns the object delivered by the API.
	 *
	 * @param string $_action The requested action.
	 * @param array $_data Parameters for the API action.
	 *
	 * @return false|object
	 * @uses get_bloginfo()
	 * @uses wp_remote_post()
	 * @uses is_wp_error()
	 *
	 */
	private function api_request( $_action, $_data ) {
		global $wp_version, $edd_plugin_url_available;
		// Do a quick status check on this domain if we haven't already checked it.
		$store_hash = md5( $this->remote_url );
		if ( ! is_array( $edd_plugin_url_available ) || ! isset( $edd_plugin_url_available[ $store_hash ] ) ) {
			$test_url_parts = parse_url( $this->remote_url );
			$scheme         = ! empty( $test_url_parts['scheme'] ) ? $test_url_parts['scheme'] : 'http';
			$host           = ! empty( $test_url_parts['host'] ) ? $test_url_parts['host'] : '';
			$port           = ! empty( $test_url_parts['port'] ) ? ':' . $test_url_parts['port'] : '';
			if ( empty( $host ) ) {
				$edd_plugin_url_available[ $store_hash ] = false;
			} else {
				$test_url                                = $scheme . '://' . $host . $port;
				$response                                = wp_remote_get( $test_url, [
					'timeout'   => $this->health_check_timeout,
					'sslverify' => true,
				] );
				$edd_plugin_url_available[ $store_hash ] = is_wp_error( $response ) ? false : true;
			}
		}
		if ( false === $edd_plugin_url_available[ $store_hash ] ) {
			return;
		}
		$data = array_merge( $this->api_data, $_data );

		if ( $data['plugin_slug'] != $this->plugin_slug ) {
			return;
		}
		if ( $this->remote_url == trailingslashit( home_url() ) ) {
			return false; // Don't allow a plugin to ping itself
		}
		$api_params = [
			'edd_action' => 'get_version',
			'license'    => ! empty( $data['key'] ) ? $data['key'] : '',
			'item_name'  => isset( $this->api_data['item_name'] ) ? $this->api_data['item_name'] : false,
			'item_id'    => isset( $this->api_data['item_id'] ) ? $this->api_data['item_id'] : false,
			'version'    => isset( $data['version'] ) ? $data['version'] : false,
			'slug'       => $data['plugin_slug'],
			'author'     => false,
			'url'        => home_url(),
			'beta'       => ! empty( $data['beta'] ),
		];
		$verify_ssl = $this->verify_ssl();
		$request    = wp_remote_post( $this->remote_url, [
			'timeout'   => 15,
			'sslverify' => $verify_ssl,
			'body'      => $api_params,
		] );

		if ( ! is_wp_error( $request ) ) {
			$request = json_decode( wp_remote_retrieve_body( $request ) );
		}

		if ( $request && isset( $request->sections ) ) {
			$request->sections = maybe_unserialize( $request->sections );
		} else {
			$request = false;
		}
		if ( $request && isset( $request->banners ) ) {
			$request->banners = maybe_unserialize( $request->banners );
		}
		if ( $request && isset( $request->icons ) ) {
			$request->icons = maybe_unserialize( $request->icons );
		}
		if ( ! empty( $request->sections ) ) {
			foreach ( $request->sections as $key => $section ) {
				$request->$key = (array) $section;
			}
		}

		return $request;
	}

	public function show_changelog() {
		global $edd_plugin_data;
		if ( empty( $_REQUEST['section'] ) || 'changelog' != $_REQUEST['section'] ) {
			return;
		}
		if ( empty( $_REQUEST['plugin'] ) ) {
			return;
		}
		if ( empty( $_REQUEST['slug'] ) ) {
			return;
		}
		if ( ! current_user_can( 'update_plugins' ) ) {
			wp_die( __( 'You do not have permission to install plugin updates', 'easy-digital-downloads' ), __( 'Error', 'easy-digital-downloads' ), [ 'response' => 403 ] );
		}
		$data         = $edd_plugin_data[ $_REQUEST['slug'] ];
		$beta         = ! empty( $data['beta'] ) ? true : false;
		$cache_key    = md5( 'wpp_plugin_' . sanitize_key( $_REQUEST['plugin'] ) . '_' . $beta . '_version_info' );
		$version_info = $this->get_cached_version_info( $cache_key );
		if ( false === $version_info ) {
			$api_params = [
				'edd_action' => 'get_version',
				'item_name'  => isset( $data['item_name'] ) ? $data['item_name'] : false,
				'item_id'    => isset( $data['item_id'] ) ? $data['item_id'] : false,
				'slug'       => 'wppopups',
				'author'     => $data['author'],
				'url'        => home_url(),
				'beta'       => ! empty( $data['beta'] ),
			];
			$verify_ssl = $this->verify_ssl();
			$request    = wp_remote_post( $this->remote_url, [
				'timeout'   => 15,
				'sslverify' => $verify_ssl,
				'body'      => $api_params,
			] );
			if ( ! is_wp_error( $request ) ) {
				$version_info = json_decode( wp_remote_retrieve_body( $request ) );
			}
			if ( ! empty( $version_info ) && isset( $version_info->sections ) ) {
				$version_info->sections = maybe_unserialize( $version_info->sections );
			} else {
				$version_info = false;
			}
			if ( ! empty( $version_info ) ) {
				foreach ( $version_info->sections as $key => $section ) {
					$version_info->$key = (array) $section;
				}
			}
			$this->set_version_info_cache( $version_info, $cache_key );
		}
		if ( ! empty( $version_info ) && isset( $version_info->sections['changelog'] ) ) {
			echo '<div style="background:#fff;padding:10px;">' . $version_info->sections['changelog'] . '</div>';
		}
		exit;
	}

	public function get_cached_version_info( $cache_key = '' ) {
		if ( empty( $cache_key ) ) {
			$cache_key = $this->cache_key;
		}
		$cache = get_option( $cache_key );
		if ( empty( $cache['timeout'] ) || time() > $cache['timeout'] ) {
			return false; // Cache is expired
		}
		// We need to turn the icons into an array, thanks to WP Core forcing these into an object at some point.
		$cache['value'] = json_decode( $cache['value'] );
		if ( ! empty( $cache['value']->icons ) ) {
			$cache['value']->icons = (array) $cache['value']->icons;
		}

		return $cache['value'];
	}

	public function set_version_info_cache( $value = '', $cache_key = '' ) {
		if ( empty( $cache_key ) ) {
			$cache_key = $this->cache_key;
		}
		$data = [
			'timeout' => strtotime( '+3 hours', time() ),
			'value'   => json_encode( $value ),
		];
		update_option( $cache_key, $data, 'no' );
	}

	/**
	 * Returns if the SSL of the store should be verified.
	 *
	 * @return bool
	 * @since 2.0.0
	 */
	private function verify_ssl() {
		return (bool) apply_filters( 'edd_sl_api_request_verify_ssl', true, $this );
	}
}