<?php
/**
 * AnsPress product updater.
 *
 * @codingStandardsIgnoreFile
 *
 * @package AnsPress
 * @author Rahul Aryan <rah12@live.com>
 */

// uncomment this line for testing
// set_site_transient( 'update_plugins', null );
// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Allows plugins to use their own update API.
 *
 * @author Pippin Williamson
 * @version 1.6.3
 */
class AnsPress_Prod_Updater {
	private $api_url        = '';
	private $api_data       = array();
	private $name           = '';
	private $slug           = '';
	private $version        = '';
	private $response_key   = '';
	private $license        = '';
	private $strings        = '';
	private $update_checked = false;
	private $is_plugin      = true;

	/**
	 * Class constructor.
	 *
	 * @uses plugin_basename()
	 * @uses hook()
	 *
	 * @param string     $_plugin_file Path to the plugin file.
	 * @param array|null $_api_data    Optional data to send with API calls.
	 * @param boolean    $is_plugin    Is plugin.
	 */
	public function __construct( $_plugin_file, $_api_data = null, $is_plugin = true ) {

		global $edd_plugin_data;

		$this->is_plugin = $is_plugin;
		$this->api_url   = trailingslashit( 'https://anspress.net' );
		$this->api_data  = $_api_data;
		$this->name      = plugin_basename( $_plugin_file );
		$this->slug      = isset( $this->api_data['slug'] ) ? $this->api_data['slug'] : basename( $_plugin_file, '.php' );
		$this->version   = $_api_data['version'];

		$this->response_key = $this->slug . '-update-response';

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

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

	}

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

		if ( $this->is_plugin ) {
			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' ) );

		} else {
			$this->strings = array(
				'theme-license'             => __( 'Theme License', 'edd-theme-updater' ),
				'enter-key'                 => __( 'Enter your theme license key.', 'edd-theme-updater' ),
				'license-key'               => __( 'License Key', 'edd-theme-updater' ),
				'license-action'            => __( 'License Action', 'edd-theme-updater' ),
				'deactivate-license'        => __( 'Deactivate License', 'edd-theme-updater' ),
				'activate-license'          => __( 'Activate License', 'edd-theme-updater' ),
				'status-unknown'            => __( 'License status is unknown.', 'edd-theme-updater' ),
				'renew'                     => __( 'Renew?', 'edd-theme-updater' ),
				'unlimited'                 => __( 'unlimited', 'edd-theme-updater' ),
				'license-key-is-active'     => __( 'License key is active.', 'edd-theme-updater' ),
				'expires%s'                 => __( 'Expires %s.', 'edd-theme-updater' ),
				'%1$s/%2$-sites'            => __( 'You have %1$s / %2$s sites activated.', 'edd-theme-updater' ),
				'license-key-expired-%s'    => __( 'License key expired %s.', 'edd-theme-updater' ),
				'license-key-expired'       => __( 'License key has expired.', 'edd-theme-updater' ),
				'license-keys-do-not-match' => __( 'License keys do not match.', 'edd-theme-updater' ),
				'license-is-inactive'       => __( 'License is inactive.', 'edd-theme-updater' ),
				'license-key-is-disabled'   => __( 'License key is disabled.', 'edd-theme-updater' ),
				'site-is-inactive'          => __( 'Site is inactive.', 'edd-theme-updater' ),
				'license-status-unknown'    => __( 'License status is unknown.', 'edd-theme-updater' ),
				'update-notice'             => __( "Updating this theme will lose any customizations you have made. 'Cancel' to stop, 'OK' to update.", 'edd-theme-updater' ),
				'update-available'          => __( '<strong>%1$s %2$s</strong> is available. <a href="%3$s" class="thickbox" title="%4s">Check out what\'s new</a> or <a href="%5$s"%6$s>update now</a>.', 'edd-theme-updater' ),
			);

			add_filter( 'site_transient_update_themes', [ $this, 'theme_update_transient' ] );
			add_filter( 'delete_site_transient_update_themes', [ $this, 'delete_theme_update_transient' ] );
			add_action( 'load-update-core.php', [ $this, 'delete_theme_update_transient' ] );
			add_action( 'load-themes.php', [ $this, 'delete_theme_update_transient' ] );
			add_action( 'load-themes.php', [ $this, 'load_themes_screen' ] );
		}

	}

	/**
	 * 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.
	 *
	 * @uses api_request()
	 *
	 * @param array $_transient_data Update array build by WordPress.
	 * @return array|object Modified update array with custom plugin data.
	 */
	function check_update( $_transient_data ) {
		if ( $this->update_checked ) {
			return $_transient_data;
		}

		$this->update_checked = true;

		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, '<' ) ) {
					$_transient_data->response[ $this->name ] = $version_info;
				}

				$_transient_data->last_checked           = time();
				$_transient_data->checked[ $this->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 ( ! 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="' . $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( $version_info->download_link ) ) {
				printf(
					__( 'There is a new version of %1$s available. <a target="_blank" class="thickbox" href="%2$s">View version %3$s details</a>.', 'easy-digital-downloads' ),
					esc_html( $version_info->name ),
					esc_url( $changelog_link ),
					esc_html( $version_info->new_version )
				);
			} else {
				printf(
					__( 'There is a new version of %1$s available. <a target="_blank" class="thickbox" href="%2$s">View version %3$s details</a> or <a href="%4$s">update now</a>.', 'easy-digital-downloads' ),
					esc_html( $version_info->name ),
					esc_url( $changelog_link ),
					esc_html( $version_info->new_version ),
					esc_url( wp_nonce_url( self_admin_url( 'update.php?action=upgrade-plugin&plugin=' ) . $this->name, 'upgrade-plugin_' . $this->name ) )
				);
			}

			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.
	 *
	 * @uses api_request()
	 *
	 * @param mixed  $_data
	 * @param string $_action
	 * @param object $_args
	 * @return object $_data
	 */
	public function plugins_api_filter( $_data, $_action = '', $_args = null ) {
		if ( $_action != 'plugin_information' ) {
			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
	 *
	 * @param array  $args
	 * @param string $url
	 * @return object $array
	 */
	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 successfull, returns the object delivered by the API.
	 *
	 * @uses get_bloginfo()
	 * @uses wp_remote_post()
	 * @uses is_wp_error()
	 *
	 * @param string $_action The requested action.
	 * @param array  $_data   Parameters for the API action.
	 * @return false|object
	 */
	private function api_request( $_action, $_data ) {

		global $wp_version;

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

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

		if ( $this->api_url == home_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(),
			'anspress_ver' => AP_VERSION,
		);

		$request = wp_remote_post(
			$this->api_url, array(
				'timeout'   => 15,
				'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;
	}

	public function show_changelog() {

		global $edd_plugin_data;

		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( __( 'You do not have permission to install plugin updates', 'easy-digital-downloads' ), __( 'Error', 'easy-digital-downloads' ), array( 'response' => 403 ) );
		}

		$data         = $edd_plugin_data[ $_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'       => $_REQUEST['slug'],
				'author'     => $data['author'],
				'url'        => home_url(),
			);

			$request = wp_remote_post(
				$this->api_url, array(
					'timeout'   => 15,
					'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;">' . $version_info->sections['changelog'] . '</div>';
		}

		wp_die();
	}

	public function theme_update_transient( $value ) {
		$update_data = $this->check_theme_update();
		if ( $update_data ) {
			$value->response[ $this->slug ] = $update_data;
		}
		return $value;
	}

	public function delete_theme_update_transient() {
		delete_transient( $this->response_key );
	}

	function load_themes_screen() {
		add_thickbox();
		add_action( 'admin_notices', [ $this, 'update_nag' ] );
	}

	function update_nag() {

		$strings = $this->strings;

		$theme = wp_get_theme( $this->slug );

		$api_response = get_transient( $this->response_key );

		if ( false === $api_response ) {
			return;
		}

		$update_url     = wp_nonce_url( 'update.php?action=upgrade-theme&amp;theme=' . urlencode( $this->slug ), 'upgrade-theme_' . $this->slug );
		$update_onclick = ' onclick="if ( confirm(\'' . esc_js( $strings['update-notice'] ) . '\') ) {return true;}return false;"';

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

			echo '<div id="update-nag">';
			printf(
				$strings['update-available'],
				$theme->get( 'Name' ),
				$api_response->new_version,
				'#TB_inline?width=640&amp;inlineId=' . $this->slug . '_changelog',
				$theme->get( 'Name' ),
				$update_url,
				$update_onclick
			);
			echo '</div>';
			echo '<div id="' . $this->slug . '_' . 'changelog" style="display:none;">';
			echo wpautop( $api_response->sections['changelog'] );
			echo '</div>';
		}
	}

	function check_theme_update() {

		$update_data = get_transient( $this->response_key );
		if ( false === $update_data ) {
			$failed = false;

			$api_params = array(
				'edd_action'   => 'get_version',
				'license'      => $this->api_data['license'],
				'name'         => $this->api_data['item_name'],
				'slug'         => $this->slug,
				'author'       => $this->api_data['author'],
				'anspress_ver' => AP_VERSION,
			);

			$response = wp_remote_post(
				$this->api_url, [
					'timeout' => 15,
					'body'    => $api_params,
				]
			);

			// Make sure the response was successful.
			if ( is_wp_error( $response ) || 200 != wp_remote_retrieve_response_code( $response ) ) {
				$failed = true;
			}

			$update_data = json_decode( wp_remote_retrieve_body( $response ) );

			if ( ! is_object( $update_data ) ) {
				$failed = true;
			}

			// If the response failed, try again in 30 minutes
			if ( $failed ) {
				$data              = new stdClass();
				$data->new_version = $this->version;
				set_transient( $this->response_key, $data, strtotime( '+30 minutes' ) );
				return false;
			}

			// If the status is 'ok', return the update arguments
			if ( ! $failed ) {
				$update_data->sections = maybe_unserialize( $update_data->sections );
				set_transient( $this->response_key, $update_data, strtotime( '+12 hours' ) );
			}
		}

		if ( version_compare( $this->version, $update_data->new_version, '>=' ) ) {
			return false;
		}

		return (array) $update_data;
	}

}
