<?php
/**
 * Update handler for Simple Settings
 *
 * @package     Widgit\SimpleSettings\Updater
 * @since       1.0.0
 */

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


/**
 * Uncomment this line for testing:
 * set_site_transient( 'update_plugins', null );
 */


/**
 * Allows plugins to use their own update API.
 *
 * @author Pippin Williamson
 * @version 1.6
 */
class Simple_Settings_Plugin_Updater {


	/**
	 * The API URL
	 *
	 * @access      private
	 * @since       1.0.0
	 * @var         string $api_url The API URL
	 */
	private $api_url = '';


	/**
	 * The API data
	 *
	 * @access      private
	 * @since       1.0.0
	 * @var         array $api_data The API data
	 */
	private $api_data = array();


	/**
	 * The item name
	 *
	 * @access      private
	 * @since       1.0.0
	 * @var         string $name The item name
	 */
	private $name = '';


	/**
	 * The item slug
	 *
	 * @access      private
	 * @since       1.0.0
	 * @var         string $slug The item slug
	 */
	private $slug = '';


	/**
	 * The item version
	 *
	 * @access      private
	 * @since       1.0.0
	 * @var         string $version The item version
	 */
	private $version = '';


	/**
	 * Class constructor.
	 *
	 * @access      public
	 * @since       1.0.0
	 * @param       string $_api_url The URL pointing to the custom API endpoint.
	 * @param       string $_plugin_file Path to the plugin file.
	 * @param       array  $_api_data Optional data to send with API calls.
	 * @return      void
	 */
	public function __construct( $_api_url, $_plugin_file, $_api_data = null ) {
		global $simple_settings_plugin_data;

		$this->api_url  = trailingslashit( $_api_url );
		$this->api_data = $_api_data;
		$this->name     = plugin_basename( $_plugin_file );
		$this->slug     = basename( $_plugin_file, '.php' );
		$this->version  = $_api_data['version'];

		$simple_settings_plugin_data[ $this->slug ] = $this->api_data;

		// Set up hooks.
		$this->init();
	}

	/**
	 * Set up WordPress filters to hook into WordPress's update process.
	 *
	 * @uses add_filter()
	 *
	 * @return void
	 */
	public function init() {

		add_filter( 'pre_set_site_transient_update_plugins', array( $this, 'check_update' ) );
		add_filter( 'plugins_api', array( $this, 'plugins_api_filter' ), 10, 3 );

		remove_action( 'after_plugin_row_' . $this->name, 'wp_plugin_update_row', 10, 2 );
		add_action( 'after_plugin_row_' . $this->name, array( $this, 'show_update_notification' ), 10, 2 );
		add_action( 'admin_init', array( $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.
	 *
	 * @access      public
	 * @since       1.0.0
	 * @param       array $_transient_data Update array build by WordPress.
	 * @return      array Modified update array with custom plugin data.
	 */
	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->name ] ) ) {

			$version_info = $this->api_request( 'plugin_latest_version', array( 'slug' => $this->slug ) );

			if ( false !== $version_info && is_object( $version_info ) && isset( $version_info->new_version ) ) {

				if ( version_compare( $this->version, $version_info->new_version, '<' ) ) {

					if ( empty( $version_info->plugin ) ) {
						$version_info->plugin = $this->name;
					}

					$_transient_data->response[ $this->name ] = $version_info;

				}

				$_transient_data->last_checked           = time();
				$_transient_data->checked[ $this->name ] = $this->version;

			}
		}

		return $_transient_data;
	}

	/**
	 * Show update notification row -- needed for multisite subsites, because WP won't tell you otherwise!
	 *
	 * @access      public
	 * @since       1.0.0
	 * @param       string $file The item file.
	 * @param       array  $plugin The plugin data.
	 * @return      void
	 */
	public function show_update_notification( $file, $plugin ) {

		if ( ! current_user_can( 'update_plugins' ) ) {
			return;
		}

		if ( ! is_multisite() ) {
			return;
		}

		if ( $this->name !== $file ) {
			return;
		}

		// Remove our filter on the site transient.
		remove_filter( 'pre_set_site_transient_update_plugins', array( $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->name ] ) ) {

			$cache_key    = md5( 'edd_plugin_' . sanitize_key( $this->name ) . '_version_info' );
			$version_info = get_transient( $cache_key );

			if ( false === $version_info ) {

				$version_info = $this->api_request( 'plugin_latest_version', array( 'slug' => $this->slug ) );

				set_transient( $cache_key, $version_info, 3600 );
			}

			if ( ! is_object( $version_info ) ) {
				return;
			}

			if ( version_compare( $this->version, $version_info->new_version, '<' ) ) {

				$update_cache->response[ $this->name ] = $version_info;

			}

			$update_cache->last_checked           = time();
			$update_cache->checked[ $this->name ] = $this->version;

			set_site_transient( 'update_plugins', $update_cache );
		} else {
			$version_info = $update_cache->response[ $this->name ];

		}

		// Restore our filter.
		add_filter( 'pre_set_site_transient_update_plugins', array( $this, 'check_update' ) );

		if ( ! empty( $update_cache->response[ $this->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' );
			echo '<tr class="plugin-update-tr"><td colspan="' . esc_attr( $wp_list_table->get_column_count() ) . '" class="plugin-update colspanchange"><div class="update-message">';

			$changelog_link = self_admin_url( 'index.php?edd_sl_action=view_plugin_changelog&plugin=' . $this->name . '&slug=' . $this->slug . '&TB_iframe=true&width=772&height=911' );

			if ( empty( $version_info->download_link ) ) {
				printf(
					// Translators: The name, link, and version.
					esc_html__( 'There is a new version of %1$s available. %2$sView version %3$s details%4$s.', 'simple-settings' ),
					esc_html( $version_info->name ),
					'<a target="_blank" class="thickbox" href="' . esc_url( $changelog_link ) . '">',
					esc_html( $version_info->new_version ),
					'</a>'
				);
			} else {
				printf(
					// Translators: The name, link, version, and download link.
					esc_html__( 'There is a new version of %1$s available. %2$sView version %3$s details%4$s or %5$supdate now%6$s.', 'simple-settings' ),
					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->name, 'upgrade-plugin_' . $this->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.
	 *
	 * @access      public
	 * @since       1.0.0
	 * @param       mixed  $_data The plugin data.
	 * @param       string $_action The page action.
	 * @param       object $_args The plugin arguments.
	 * @return      object $_data Data for the details page.
	 */
	public function plugins_api_filter( $_data, $_action = '', $_args = null ) {
		if ( 'plugin_information' !== $_action ) {
			return $_data;
		}

		if ( ! isset( $_args->slug ) || ( $_args->slug !== $this->slug ) ) {
			return $_data;
		}

		$to_send = array(
			'slug'   => $this->slug,
			'is_ssl' => is_ssl(),
			'fields' => array(
				'banners' => false, // These will be supported soon hopefully.
				'reviews' => false,
			),
		);

		$api_response = $this->api_request( 'plugin_information', $to_send );

		if ( false !== $api_response ) {
			$_data = $api_response;
		}

		return $_data;
	}


	/**
	 * Disable SSL verification in order to prevent download update failures
	 *
	 * @access      public
	 * @since       1.0.0
	 * @param       array  $args The HTTP request arguments.
	 * @param       string $url The requested URL.
	 * @return      object $array The HTTP request arguments
	 */
	public function http_request_args( $args, $url ) {
		// If it is an https request and we are performing a package download, disable ssl verification.
		if ( strpos( $url, 'https://' ) !== false && strpos( $url, 'edd_action=package_download' ) ) {
			$args['sslverify'] = false;
		}
		return $args;
	}

	/**
	 * Calls the API and, if successful, returns the object delivered by the API.
	 *
	 * @access      private
	 * @since       1.0.0
	 * @param       string $_action The requested action.
	 * @param       array  $_data Parameters for the API action.
	 * @return      false|object The data fetched from the API
	 */
	private function api_request( $_action, $_data ) {

		global $wp_version;

		$data = array_merge( $this->api_data, $_data );

		if ( $data['slug'] !== $this->slug ) {
			return;
		}

		if ( empty( $data['license'] ) ) {
			return;
		}

		if ( home_url() === $this->api_url ) {
			return false; // Don't allow a plugin to ping itself.
		}

		$api_params = array(
			'edd_action' => 'get_version',
			'license'    => ! empty( $data['license'] ) ? $data['license'] : '',
			'item_name'  => isset( $data['item_name'] ) ? $data['item_name'] : false,
			'item_id'    => isset( $data['item_id'] ) ? $data['item_id'] : false,
			'slug'       => $data['slug'],
			'author'     => $data['author'],
			'url'        => home_url(),
		);

		$request = wp_remote_post(
			$this->api_url,
			array(
				'timeout'   => 3,
				'sslverify' => false,
				'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;
		}

		return $request;
	}


	/**
	 * Show the item changelog
	 *
	 * @access      public
	 * @since       1.0.0
	 * @return      void
	 */
	public function show_changelog() {
		if ( isset( $_REQUEST[ $this->name . '_settings_nonce' ] ) ) {
			check_admin_referer( $this->name . '_settings_nonce', $this->name . '_settings_nonce' );
		}

		if ( empty( $_REQUEST['edd_sl_action'] ) || 'view_plugin_changelog' !== $_REQUEST['edd_sl_action'] ) {
			return;
		}

		if ( empty( $_REQUEST['plugin'] ) ) {
			return;
		}

		if ( empty( $_REQUEST['slug'] ) ) {
			return;
		}

		if ( ! current_user_can( 'update_plugins' ) ) {
			wp_die( esc_html__( 'You do not have permission to install plugin updates', 'simple-settings' ), esc_html__( 'Error', 'simple-settings' ), array( 'response' => 403 ) );
		}

		global $simple_settings_plugin_data;

		$data         = $simple_settings_plugin_data[ sanitize_text_field( wp_unslash( $_REQUEST['slug'] ) ) ];
		$cache_key    = md5( 'edd_plugin_' . sanitize_key( $_REQUEST['plugin'] ) . '_version_info' );
		$version_info = get_transient( $cache_key );

		if ( false === $version_info ) {
			$api_params = array(
				'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'       => sanitize_text_field( wp_unslash( $_REQUEST['slug'] ) ),
				'author'     => $data['author'],
				'url'        => home_url(),
			);

			$request = wp_remote_post(
				$this->api_url,
				array(
					'timeout'   => 3,
					'sslverify' => false,
					'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;
			}

			set_transient( $cache_key, $version_info, 3600 );
		}

		if ( ! empty( $version_info ) && isset( $version_info->sections['changelog'] ) ) {
			echo '<div style="background:#fff;padding:10px;">' . esc_html( $response->sections['changelog'] ) . '</div>';
		}

		exit;
	}

}
