<?php

if (!class_exists('PMXE_Updater')) {

    class PMXE_Updater
    {
        private $api_url = '';
        private $api_data = array();
        private $name = '';
        private $slug = '';
        private $_plugin_file = '';
        private $did_check = false;
        private $version;

        /**
         * Class constructor.
         *
         * @uses plugin_basename()
         * @uses hook()
         *
         * @param string $_api_url The URL pointing to the custom API endpoint.
         * @param string $_plugin_file Path to the plugin file.
         * @param array $_api_data Optional data to send with API calls.
         */
        function __construct($_api_url, $_plugin_file, $_api_data = null)
        {
            $this->api_url = trailingslashit($_api_url);
            $this->api_data = urlencode_deep($_api_data);
            $this->name = plugin_basename($_plugin_file);
            $this->slug = basename($_plugin_file, '.php');

            $this->version = $_api_data['version'];
            $this->_plugin_file = $_plugin_file;

            // Set up hooks.
            $this->init();
            add_action('admin_init', array($this, 'show_changelog'));
        }

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

            add_filter('pre_set_site_transient_update_plugins', array($this, 'check_update'), 20);
            add_filter('plugins_api', array($this, 'plugins_api_filter'), 10, 3);

            add_action('after_plugin_row_' . $this->name, array($this, 'show_update_notification'), 11, 2);
            add_filter('plugin_row_meta', array($this, 'plugin_row_meta'), 10, 2);
        }

        /**
         * Show row meta on the plugin screen.
         *
         * @param    mixed $links Plugin Row Meta
         * @param    mixed $file Plugin Base file
         * @return    array
         */
        public function plugin_row_meta($links, $file)
        {
            if ($file == $this->name) {
                $row_meta = array(
                    'changelog' => '<a href="' . admin_url('plugin-install.php?tab=plugin-information&plugin=wp-all-export-pro&section=changelog&TB_iframe=true&width=600&height=800') . '" class="thickbox open-plugin-details-modal" title="' . esc_attr(__('View WP All Export Pro Changelog', 'wp_all_export_plugin')) . '">' . __('Changelog', 'wp_all_export_plugin') . '</a>',
                );

                return array_merge($links, $row_meta);
            }

            return (array)$links;
        }

        /**
         * 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 $_transient_data Update array build by WordPress.
         * @return array Modified update array with custom plugin data.
         */
        function check_update($_transient_data)
        {

            global $pagenow;
            global $wpdb;

            if (!is_object($_transient_data)) {
                $_transient_data = new stdClass;
            }

            if ('plugins.php' == $pagenow && is_multisite()) {
                return $_transient_data;
            }

            if (empty($_transient_data)) return $_transient_data;

            if (empty($_transient_data->response) || empty($_transient_data->response[$this->name])) {

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

                if (false === $version_info) {

                    $timeout = $wpdb->get_row($wpdb->prepare("SELECT option_value FROM $wpdb->options WHERE option_name = %s LIMIT 1", $this->slug . '_timeout_' . $cache_key));

                    // Has to be get_row instead of get_var because of funkiness with 0, false, null values
                    if (is_object($timeout)) {
                        $value = $timeout->option_value;
                        // cache time is not expired
                        if ($value >= strtotime("now")) {
                            $cache_value = $wpdb->get_row($wpdb->prepare("SELECT option_value FROM $wpdb->options WHERE option_name = %s LIMIT 1", $this->slug . '_' . $cache_key));
                            if (is_object($cache_value) and !empty($cache_value->option_value)) {
                                $version_info = maybe_unserialize($cache_value->option_value);
                            }
                        }
                    }

                    if (false === $version_info) {
                        $version_info = $this->api_request('check_update', array('slug' => $this->slug));
                        $transient_result = set_transient($cache_key, $version_info, 3600);

                        $wpdb->query($wpdb->prepare("DELETE FROM $wpdb->options WHERE option_name = %s", $this->slug . '_' . $cache_key));
                        $wpdb->query($wpdb->prepare("DELETE FROM $wpdb->options WHERE option_name = %s", $this->slug . '_timeout_' . $cache_key));

                        $wpdb->query($wpdb->prepare("INSERT INTO $wpdb->options ( option_value, option_name, autoload ) VALUES ( %s, %s, 'no' )", maybe_serialize($version_info), $this->slug . '_' . $cache_key));
                        $wpdb->query($wpdb->prepare("INSERT INTO $wpdb->options ( option_value, option_name ) VALUES ( %s, %s )", strtotime("+1 hour"), $this->slug . '_timeout_' . $cache_key));

                    }

                }

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

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

                    $this->did_check = true;

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

            // Remove our filter on the site transient
            remove_filter('pre_set_site_transient_update_plugins', array($this, 'check_update'), 21);

            $update_cache = get_site_transient('update_plugins');

            if (!is_object($update_cache) || empty($update_cache->response) || empty($update_cache->response[$this->name])) {

                global $wpdb;

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

                if (false === $version_info) {

                    $timeout = $wpdb->get_row($wpdb->prepare("SELECT option_value FROM $wpdb->options WHERE option_name = %s LIMIT 1", $this->slug . '_timeout_' . $cache_key));

                    // Has to be get_row instead of get_var because of funkiness with 0, false, null values
                    if (is_object($timeout)) {
                        $value = $timeout->option_value;
                        // cache time is not expired
                        if ($value >= strtotime("now")) {
                            $cache_value = $wpdb->get_row($wpdb->prepare("SELECT option_value FROM $wpdb->options WHERE option_name = %s LIMIT 1", $this->slug . '_' . $cache_key));
                            if (is_object($cache_value) and !empty($cache_value->option_value)) {
                                $version_info = maybe_unserialize($cache_value->option_value);
                            }
                        }
                    }

                    if (false === $version_info) {

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

                        $transient_result = set_transient($cache_key, $version_info, 3600);

                        $wpdb->query($wpdb->prepare("DELETE FROM $wpdb->options WHERE option_name = %s", $this->slug . '_' . $cache_key));
                        $wpdb->query($wpdb->prepare("DELETE FROM $wpdb->options WHERE option_name = %s", $this->slug . '_timeout_' . $cache_key));

                        $wpdb->query($wpdb->prepare("INSERT INTO $wpdb->options ( option_value, option_name, autoload ) VALUES ( %s, %s, 'no' )", maybe_serialize($version_info), $this->slug . '_' . $cache_key));
                        $wpdb->query($wpdb->prepare("INSERT INTO $wpdb->options ( option_value, option_name ) VALUES ( %s, %s )", strtotime("+1 hour"), $this->slug . '_timeout_' . $cache_key));

                    }
                }

                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'), 20);

            $plugin_title = $plugin['Name'];
            $plugin_slug = sanitize_title($plugin_title);
            $active = is_plugin_active($file) ? 'active' : '';
            $shiny_updates = version_compare(get_bloginfo('version'), '1.4.7-beta1-37926', '>=');
            $update_msg_classes = $shiny_updates ? 'notice inline notice-warning notice-alt' : 'pre-shiny-updates';
            $new_version = '';

            if (!empty($update_cache->response[$this->name]) && version_compare($this->version, $version_info->new_version, '<')) {

                // build a plugin list row, with update notification
                $changelog_link = self_admin_url('plugin-install.php?tab=plugin-information&plugin=' . $this->slug . '&section=changelog&TB_iframe=true&width=772&height=412');
                if (empty($version_info->download_link)) {
                    if ($shiny_updates) $update_msg_classes .= ' post-shiny-updates';
                    $new_version = "<span class=\"wp-all-export-pro-new-version-notice\">" . sprintf(
                            __('A new version of WP All Export Pro available. <strong>A valid license is required to enable updates - enter your license key on the <a href="%1$s">Licenses</a> page.</strong>', 'wp_all_export_plugin'),
                            esc_url(admin_url('admin.php?page=pmxe-admin-settings'))
                        ) . "</span>";
                    $new_version .= "<span class=\"wp-all-export-pro-licence-error-notice\">" . sprintf(
                            __('If you don\'t have a licence key, please see <a href="%1$s" target="_blank">details & pricing</a>. If you do have a licence key, you can access it at the <a href="%2$s" target="_blank">customer portal</a>.', 'wp_all_export_plugin'),
                            esc_url('http://www.wpallimport.com/order-now/'),
                            esc_url('http://www.wpallimport.com/portal/')
                        ) . "</span>";
                } else {
                    $new_version = "<span class=\"wp-all-export-pro-new-version-notice\">" . sprintf(
                            __('There is a new version of WP All Export Pro available. <a target="_blank" class="thickbox" href="%1$s">View version %2$s details</a> or <a href="%3$s" class="update-link">update now</a>.', 'wp_all_export_plugin'),
                            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))
                        ) . "</span>";
                }
            }

            if (empty($new_version)) {
                return;
            }
            ?>
            <tr class="plugin-update-tr <?php echo $active; ?> wp-all-export-pro-custom">
                <td colspan="3" class="plugin-update">
                    <div class="update-message <?php echo $update_msg_classes; ?>">
                        <p>
                            <?php echo $new_version; ?>
                        </p>
                    </div>
                </td>
            </tr>
            <?php if ($new_version) { // removes the built-in plugin update message ?>
                <script type="text/javascript">
                    (function ($) {
                        var wp_all_export_row = jQuery('[data-slug=<?php echo $plugin_slug; ?>]:first');

                        // Fallback for earlier versions of WordPress.
                        if (!wp_all_export_row.length) {
                            wp_all_export_row = jQuery('#<?php echo $plugin_slug; ?>');
                        }

                        var next_row = wp_all_export_row.next();

                        // If there's a plugin update row - need to keep the original update row available so we can switch it out
                        // if the user has a successful response from the 'check my license again' link
                        if (next_row.hasClass('plugin-update-tr') && !next_row.hasClass('wp-all-export-pro-custom')) {
                            var original = next_row.clone();
                            // original.add;
                            next_row.html(next_row.next().html()).addClass('wp-all-export-pro-custom-visible');
                            next_row.next().remove();
                            next_row.after(original);
                            original.addClass('wp-all-export-original-update-row');
                        }
                    })(jQuery);
                </script>
                <?php
            }            
        }

        /**
         * 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 $_data
         */
        function plugins_api_filter($_data, $_action = '', $_args = null)
        {

            if ($_action != 'plugin_information') {

                return $_data;

            }

            if (!isset($_args->slug) || ($_args->slug != $this->slug)) {

                return $_data;

            }

            global $wpdb;

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

            if (false === $_data) {

                $timeout = $wpdb->get_row($wpdb->prepare("SELECT option_value FROM $wpdb->options WHERE option_name = %s LIMIT 1", $this->slug . '_timeout_' . $cache_key));

                // Has to be get_row instead of get_var because of funkiness with 0, false, null values
                if (is_object($timeout)) {
                    $value = $timeout->option_value;
                    // cache time is not expired
                    if ($value >= strtotime("now")) {
                        $cache_value = $wpdb->get_row($wpdb->prepare("SELECT option_value FROM $wpdb->options WHERE option_name = %s LIMIT 1", $this->slug . '_' . $cache_key));
                        if (is_object($cache_value) and !empty($cache_value->option_value)) {
                            $_data = maybe_unserialize($cache_value->option_value);
                        }
                    }
                }

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

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

                    if (false !== $_data) {

                        $transient_result = set_transient($cache_key, $_data, 3600);

                        $wpdb->query($wpdb->prepare("DELETE FROM $wpdb->options WHERE option_name = %s", $this->slug . '_' . $cache_key));
                        $wpdb->query($wpdb->prepare("DELETE FROM $wpdb->options WHERE option_name = %s", $this->slug . '_timeout_' . $cache_key));

                        $wpdb->query($wpdb->prepare("INSERT INTO $wpdb->options ( option_value, option_name, autoload ) VALUES ( %s, %s, 'no' )", maybe_serialize($_data), $this->slug . '_' . $cache_key));
                        $wpdb->query($wpdb->prepare("INSERT INTO $wpdb->options ( option_value, option_name ) VALUES ( %s, %s )", strtotime("+1 hour"), $this->slug . '_timeout_' . $cache_key));

                    }
                }
            }

            return $_data;
        }


        /**
         * Disable SSL verification in order to prevent download update failures
         *
         * @param array $args
         * @param string $url
         * @return object $array
         */
        function http_request_args($args, $url)
        {

            if (defined('WPALLEXPORT_SIGNATURE')) $args['body'] = array('signature' => WPALLEXPORT_SIGNATURE);

            // 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 ( empty( $data['license'] ) )
                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' => $data['license'],
                'item_name' => isset($data['item_name']) ? $data['item_name'] : false,
                'item_id' => isset($data['item_id']) ? $data['item_id'] : false,
                'slug' => $data['slug'],
                'plugin' => $this->_plugin_file,
                'author' => $data['author'],
                'url' => home_url(),
                'version' => $this->version,
                'signature' => defined('WPALLEXPORT_SIGNATURE') ? WPALLEXPORT_SIGNATURE : ''
            );

            // if ( defined('WP_DEBUG') and WP_DEBUG )
            // {
            //     $uploads = wp_upload_dir();
            //     file_put_contents($uploads['basedir'] . "/log.txt", date("d-m-Y H:i:s") . ' - ' .json_encode($api_params) . "\n", FILE_APPEND);
            // }

            $request = wp_remote_post($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->banners)) {
                $request->banners = maybe_unserialize($request->banners);
            }

            if ($request && isset($request->sections)) {
                $request->sections = maybe_unserialize($request->sections);
            } else {
                $request = false;
            }

            return $request;
        }

        public function show_changelog()
        {


            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', 'edd'), __('Error', 'edd'), array('response' => 403));
            }

            $response = $this->api_request('show_changelog', array('slug' => $_REQUEST['slug']));

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


            exit;
        }
    }

}