<?php
/*
Plugin Name: Gravity Forms
Plugin URI: http://www.gravityforms.com
Description: Easily create web forms and manage form entries within the WordPress admin.
Version: 1.6.8.1
Author: rocketgenius
Author URI: http://www.rocketgenius.com

------------------------------------------------------------------------
Copyright 2009-2011 Rocketgenius Inc.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/


//------------------------------------------------------------------------------------------------------------------
//---------- Gravity Forms License Key -----------------------------------------------------------------------------
//------------------------------------------------------------------------------------------------------------------
//If you hardcode a Gravity Forms License Key here, it will automatically populate on activation.
$gf_license_key = "";

//-- OR ---//

//You can also add the Gravity Forms license key to your wp-config.php file to automatically populate on activation
//Add the code in the comment below to your wp-config.php to do so:
//define('GF_LICENSE_KEY','YOUR_KEY_GOES_HERE');
//------------------------------------------------------------------------------------------------------------------

//------------------------------------------------------------------------------------------------------------------
//---------- reCAPTCHA Keys -----------------------------------------------------------------------------
//------------------------------------------------------------------------------------------------------------------
//If you hardcode your reCAPTCHA Keys here, it will automatically populate on activation.
$gf_recaptcha_private_key = "";
$gf_recaptcha_public_key = "";

//-- OR ---//

//You can also add the reCAPTCHA keys to your wp-config.php file to automatically populate on activation
//Add the two lines of code in the comment below to your wp-config.php to do so:
//define('GF_RECAPTCHA_PRIVATE_KEY','YOUR_PRIVATE_KEY_GOES_HERE');
//define('GF_RECAPTCHA_PUBLIC_KEY','YOUR_PUBLIC_KEY_GOES_HERE');
//------------------------------------------------------------------------------------------------------------------

if(!defined("RG_CURRENT_PAGE"))
    define("RG_CURRENT_PAGE", basename($_SERVER['PHP_SELF']));

if(!defined("IS_ADMIN"))
    define("IS_ADMIN",  is_admin());

define("RG_CURRENT_VIEW", RGForms::get("view"));
define("GF_MIN_WP_VERSION", '3.2');
define("GF_SUPPORTED_WP_VERSION", version_compare(get_bloginfo("version"), GF_MIN_WP_VERSION, '>='));

if(!defined("GRAVITY_MANAGER_URL"))
    define("GRAVITY_MANAGER_URL", "http://www.gravityhelp.com/wp-content/plugins/gravitymanager");

require_once(WP_PLUGIN_DIR . "/" . basename(dirname(__FILE__)) . "/common.php");
require_once(WP_PLUGIN_DIR . "/" . basename(dirname(__FILE__)) . "/forms_model.php");
require_once(WP_PLUGIN_DIR . "/" . basename(dirname(__FILE__)) . "/widget.php");


add_action('init',  array('RGForms', 'init'));
add_action('wp',  array('RGForms', 'maybe_process_form'), 9);
add_action('wp',  array('RGForms', 'process_exterior_pages'));

add_filter('user_has_cap', array("RGForms", "user_has_cap"), 10, 3);


//Hooks for no-conflict functionality
if(is_admin() && (RGForms::is_gravity_page() || RGForms::is_gravity_ajax_action())){
    add_action("wp_print_scripts", array("RGForms", "no_conflict_mode_script"), 1000);
    add_action("admin_print_footer_scripts", array("RGForms", "no_conflict_mode_script"), 9);

    add_action("wp_print_styles", array("RGForms", "no_conflict_mode_style"), 1000);
    add_action("admin_print_styles", array("RGForms", "no_conflict_mode_style"), 1);
    add_action("admin_print_footer_scripts", array("RGForms", "no_conflict_mode_style"), 1);
    add_action("admin_footer", array("RGForms", "no_conflict_mode_style"), 1);
}

class RGForms{

    public static function has_members_plugin(){
        return function_exists( 'members_get_capabilities' );
    }

    //Plugin starting point. Will load appropriate files
    public static function init(){

        load_plugin_textdomain( 'gravityforms', false, '/gravityforms/languages' );

        add_filter("gform_logging_supported", array("RGForms", "set_logging_supported"));

        if(IS_ADMIN){

            global $current_user;

            //Members plugin integration. Adding Gravity Forms roles to the checkbox list
            if (self::has_members_plugin())
                add_filter('members_get_capabilities', array("RGForms", "members_get_capabilities"));

            //Loading Gravity Forms if user has access to any functionality
            if(GFCommon::current_user_can_any(GFCommon::all_caps()))
            {
                require_once(GFCommon::get_base_path() . "/export.php");
                GFExport::maybe_export();

                //runs the setup when version changes
                self::setup();

                //creates the "Forms" left menu
                add_action('admin_menu',  array('RGForms', 'create_menu'));

                if(GF_SUPPORTED_WP_VERSION){

                    add_action('admin_footer',  array('RGForms', 'check_upload_folder'));
                    add_action('wp_dashboard_setup', array('RGForms', 'dashboard_setup'));

                    //Adding "embed form" button
                    add_action('media_buttons_context', array('RGForms', 'add_form_button'));

                    //Plugin update actions
                    add_filter("transient_update_plugins", array('RGForms', 'check_update'));
                    add_filter("site_transient_update_plugins", array('RGForms', 'check_update'));

                    if(in_array(RG_CURRENT_PAGE, array('post.php', 'page.php', 'page-new.php', 'post-new.php'))){
                        add_action('admin_footer',  array('RGForms', 'add_mce_popup'));
                    }
                    else if(self::is_gravity_page()){
                        require_once(GFCommon::get_base_path() . "/tooltips.php");
                        add_action("admin_print_scripts", array('RGForms', 'print_scripts'));
                    }
                    else if(RG_CURRENT_PAGE == 'media-upload.php'){
                        require_once(GFCommon::get_base_path() . "/entry_list.php");
                    }
                    else if(in_array(RG_CURRENT_PAGE, array("admin.php", "admin-ajax.php"))){

                        add_action('wp_ajax_rg_save_form', array('RGForms', 'save_form'));
                        add_action('wp_ajax_rg_change_input_type', array('RGForms', 'change_input_type'));
                        add_action('wp_ajax_rg_add_field', array('RGForms', 'add_field'));
                        add_action('wp_ajax_rg_duplicate_field', array('RGForms', 'duplicate_field'));
                        add_action('wp_ajax_rg_delete_field', array('RGForms', 'delete_field'));
                        add_action('wp_ajax_rg_delete_file', array('RGForms', 'delete_file'));
                        add_action('wp_ajax_rg_select_export_form', array('RGForms', 'select_export_form'));
                        add_action('wp_ajax_rg_start_export', array('RGForms', 'start_export'));
                        add_action('wp_ajax_gf_upgrade_license', array('RGForms', 'upgrade_license'));
                        add_action('wp_ajax_gf_delete_custom_choice', array('RGForms', 'delete_custom_choice'));
                        add_action('wp_ajax_gf_save_custom_choice', array('RGForms', 'save_custom_choice'));
                        add_action('wp_ajax_gf_get_post_categories', array('RGForms', 'get_post_category_values'));
                        add_action('wp_ajax_gf_get_notification_post_categories', array('RGForms', 'get_notification_post_category_values'));

                        //entry list ajax operations
                        add_action('wp_ajax_rg_update_lead_property', array('RGForms', 'update_lead_property'));
                        add_action('wp_ajax_delete-gf_entry', array('RGForms', 'update_lead_status'));

                        //form list ajax operations
                        add_action('wp_ajax_rg_update_form_active', array('RGForms', 'update_form_active'));

                        //dynamic captcha image
                        add_action('wp_ajax_rg_captcha_image', array('RGForms', 'captcha_image'));

                        //dashboard message "dismiss upgrade" link
                        add_action("wp_ajax_rg_dismiss_upgrade", array('RGForms', 'dashboard_dismiss_upgrade'));

                        // entry detial: resend notifications
                        add_action("wp_ajax_gf_resend_notifications", array('RGForms', 'resend_notifications'));

                    }

                    add_filter("plugins_api", array("RGForms", "get_addon_info"), 10, 3);
                    add_action('after_plugin_row_gravityforms/gravityforms.php', array('RGForms', 'plugin_row') );
                    add_action('install_plugins_pre_plugin-information', array('RGForms', 'display_changelog'));
                    add_filter('plugin_action_links', array('RGForms', 'plugin_settings_link'),10,2);
                }
            }
        }
        else{
            add_action('wp_enqueue_scripts', array('RGForms', 'enqueue_scripts'));
            add_action('wp', array('RGForms', 'ajax_parse_request'), 10);

            // ManageWP premium update filters
            add_filter( 'mwp_premium_update_notification', array('RGForms', 'premium_update_push') );
            add_filter( 'mwp_premium_perform_update', array('RGForms', 'premium_update') );
        }

        add_shortcode('gravityform', array('RGForms', 'parse_shortcode'));
        add_shortcode('gravityforms', array('RGForms', 'parse_shortcode'));
    }

    public static function set_logging_supported($plugins)
    {
        $plugins["gravityforms"] = "Gravity Forms Core";
        return $plugins;
    }

    public static function maybe_process_form(){

        $form_id = isset($_POST["gform_submit"]) ? $_POST["gform_submit"] : 0;
        if($form_id){
            $form_info = RGFormsModel::get_form($form_id);
            $is_valid_form = $form_info && $form_info->is_active;

            if($is_valid_form){
                require_once(GFCommon::get_base_path() . "/form_display.php");
                GFFormDisplay::process_form($form_id);
            }
        }
    }

    public static function process_exterior_pages(){
        if(rgempty("gf_page", $_GET))
            return;

        //ensure users are logged in
        if(!is_user_logged_in())
            auth_redirect();

        switch(rgget("gf_page")){
            case "preview":
                require_once(GFCommon::get_base_path() . "/preview.php");
            break;

            case "print-entry" :
                require_once(GFCommon::get_base_path() . "/print-entry.php");
            break;

            case "select_columns" :
                require_once(GFCommon::get_base_path() . "/select_columns.php");
            break;
        }
        exit();
    }

    public static function check_update($update_plugins_option){
        if(!class_exists("GFCommon"))
            require_once("common.php");

        return GFCommon::check_update($update_plugins_option, true);
    }

    //Creates or updates database tables. Will only run when version changes
    public static function setup($force_setup = false){
        global $wpdb;

        $version = GFCommon::$version;

        if(get_option("rg_form_version") != $version || $force_setup){

            $error = "";
            if(!self::has_database_permission($error)){
                ?>
                <div class='error' style="padding:15px;"><?php echo $error?></div>
                <?php
            }

            require_once(ABSPATH . '/wp-admin/includes/upgrade.php');

            if ( ! empty($wpdb->charset) )
                $charset_collate = "DEFAULT CHARACTER SET $wpdb->charset";
            if ( ! empty($wpdb->collate) )
                $charset_collate .= " COLLATE $wpdb->collate";

            //Fixes issue with dbDelta lower-casing table names, which cause problems on case sensitive DB servers.
            add_filter( 'dbdelta_create_queries', array("RGForms", "dbdelta_fix_case"));

            //------ FORM -----------------------------------------------
            $form_table_name = RGFormsModel::get_form_table_name();
            $sql = "CREATE TABLE " . $form_table_name . " (
                  id mediumint(8) unsigned not null auto_increment,
                  title varchar(150) not null,
                  date_created datetime not null,
                  is_active tinyint(1) not null default 1,
                  PRIMARY KEY  (id)
                ) $charset_collate;";
            dbDelta($sql);

            //droping table that was created by mistake in version 1.6.3.2
            $wpdb->query("DROP TABLE IF EXISTS A" . $form_table_name);

            //------ META -----------------------------------------------
            $meta_table_name = RGFormsModel::get_meta_table_name();
            $sql = "CREATE TABLE " . $meta_table_name . " (
                  form_id mediumint(8) unsigned not null,
                  display_meta longtext,
                  entries_grid_meta longtext,
                  PRIMARY KEY  (form_id)
                ) $charset_collate;";
            dbDelta($sql);

            //droping outdated form_id index (if one exists)
            self::drop_index($meta_table_name, 'form_id');

            //------ FORM VIEW -----------------------------------------------
            $form_view_table_name = RGFormsModel::get_form_view_table_name();
            $sql = "CREATE TABLE " . $form_view_table_name . " (
                  id bigint(20) unsigned not null auto_increment,
                  form_id mediumint(8) unsigned not null,
                  date_created datetime not null,
                  ip char(15),
                  count mediumint(8) unsigned not null default 1,
                  PRIMARY KEY  (id),
                  KEY form_id (form_id)
                ) $charset_collate;";
            dbDelta($sql);

            //------ LEAD -----------------------------------------------
            $lead_table_name = RGFormsModel::get_lead_table_name();
            $sql = "CREATE TABLE " . $lead_table_name . " (
                  id int(10) unsigned not null auto_increment,
                  form_id mediumint(8) unsigned not null,
                  post_id bigint(20) unsigned,
                  date_created datetime not null,
                  is_starred tinyint(1) not null default 0,
                  is_read tinyint(1) not null default 0,
                  ip varchar(39) not null,
                  source_url varchar(200) not null default '',
                  user_agent varchar(250) not null default '',
                  currency varchar(5),
                  payment_status varchar(15),
                  payment_date datetime,
                  payment_amount decimal(19,2),
                  transaction_id varchar(50),
                  is_fulfilled tinyint(1),
                  created_by bigint(20) unsigned,
                  transaction_type tinyint(1),
                  status varchar(20) not null default 'active',
                  PRIMARY KEY  (id),
                  KEY form_id (form_id),
                  KEY status (status)
                ) $charset_collate;";
           dbDelta($sql);

           //------ LEAD NOTES ------------------------------------------
            $lead_notes_table_name = RGFormsModel::get_lead_notes_table_name();
            $sql = "CREATE TABLE " . $lead_notes_table_name . " (
                  id int(10) unsigned not null auto_increment,
                  lead_id int(10) unsigned not null,
                  user_name varchar(250),
                  user_id bigint(20),
                  date_created datetime not null,
                  value longtext,
                  PRIMARY KEY  (id),
                  KEY lead_id (lead_id),
                  KEY lead_user_key (lead_id,user_id)
                ) $charset_collate;";
           dbDelta($sql);

            //------ LEAD DETAIL -----------------------------------------
            $lead_detail_table_name = RGFormsModel::get_lead_details_table_name();
            $sql = "CREATE TABLE " . $lead_detail_table_name . " (
                  id bigint(20) unsigned not null auto_increment,
                  lead_id int(10) unsigned not null,
                  form_id mediumint(8) unsigned not null,
                  field_number float not null,
                  value varchar(". GFORMS_MAX_FIELD_LENGTH ."),
                  PRIMARY KEY  (id),
                  KEY form_id (form_id),
                  KEY lead_id (lead_id)
                ) $charset_collate;";
            dbDelta($sql);

            //------ LEAD DETAIL LONG -----------------------------------
            $lead_detail_long_table_name = RGFormsModel::get_lead_details_long_table_name();

            $sql = "CREATE TABLE " . $lead_detail_long_table_name . " (
                  lead_detail_id bigint(20) unsigned not null,
                  value longtext,
                  PRIMARY KEY  (lead_detail_id)
                ) $charset_collate;";
            dbDelta($sql);

            //droping outdated form_id index (if one exists)
            self::drop_index($lead_detail_long_table_name, 'lead_detail_key');

            //------ LEAD META -----------------------------------
            $lead_meta_table_name = RGFormsModel::get_lead_meta_table_name();
            $sql = "CREATE TABLE " . $lead_meta_table_name . " (
                  id bigint(20) unsigned not null auto_increment,
                  lead_id bigint(20) unsigned not null,
                  meta_key varchar(255),
                  meta_value longtext,
                  PRIMARY KEY  (id),
                  KEY meta_key (meta_key),
                  KEY lead_id (lead_id)
                ) $charset_collate;";
            dbDelta($sql);

            remove_filter('dbdelta_create_queries', array("RGForms", "dbdelta_fix_case"));

            //fix checkbox value. needed for version 1.0 and below but won't hurt for higher versions
            self::fix_checkbox_value();

            //auto-setting license key based on value configured via the GF_LICENSE_KEY constant or the gf_license_key variable
            global $gf_license_key;
            $license_key = defined("GF_LICENSE_KEY") && empty($gf_license_key) ? GF_LICENSE_KEY : $gf_license_key;
            if(!empty($license_key))
                update_option("rg_gforms_key", md5($license_key));

            //auto-setting recaptcha keys based on value configured via the constant or global variable
            global $gf_recaptcha_public_key, $gf_recaptcha_private_key;
            $private_key = defined("GF_RECAPTCHA_PRIVATE_KEY") && empty($gf_recaptcha_private_key) ? GF_RECAPTCHA_PRIVATE_KEY : $gf_recaptcha_private_key;
            if(!empty($private_key))
                update_option("rg_gforms_captcha_private_key", $private_key);

            $public_key = defined("GF_RECAPTCHA_PUBLIC_KEY") && empty($gf_recaptcha_public_key) ? GF_RECAPTCHA_PUBLIC_KEY : $gf_recaptcha_public_key;
            if(!empty($public_key))
                update_option("rg_gforms_captcha_public_key", $public_key);

            //Auto-importing forms based on GF_IMPORT_FILE AND GF_THEME_IMPORT_FILE
            if(defined("GF_IMPORT_FILE") && !get_option("gf_imported_file")){
                GFExport::import_file(GF_IMPORT_FILE);
                update_option("gf_imported_file", true);
            }

            //adds empty index.php files to upload folders. only for v1.5.2 and below
            if(version_compare(get_option("rg_form_version"), "1.6", "<")){
                self::add_empty_index_files();
            }

            update_option("rg_form_version", $version);
        }

        //Import theme specific forms if configured. Will only import forms once per theme.
        if(defined("GF_THEME_IMPORT_FILE")){
            $themes = get_option("gf_imported_theme_file");
            if(!is_array($themes))
                $themes = array();

            //if current theme has already imported it's forms, don't import again
            $theme = get_template();
            if(!isset($themes[$theme])){

                //importing forms
                GFExport::import_file(get_stylesheet_directory() . "/" . GF_THEME_IMPORT_FILE);

                //adding current theme to the list of imported themes. So that forms are not imported again for it.
                $themes[$theme] = true;
                update_option("gf_imported_theme_file", $themes);
            }
        }
    }

    public static function dbdelta_fix_case($cqueries){
        foreach ($cqueries as $table => $qry) {
            $table_name = $table;
            if(preg_match("|CREATE TABLE ([^ ]*)|", $qry, $matches)){
                $query_table_name = trim($matches[1], '`' );

                //fix table names that are different just by their casing
                if(strtolower($query_table_name) == $table){
                    $table_name = $query_table_name;
                }
            }
            $queries[$table_name] = $qry;
        }
        return $queries;
    }

    public static function no_conflict_mode_style(){
        if(!get_option("gform_enable_noconflict"))
            return;

        global $wp_styles;
        $wp_required_styles = array("admin-bar", "colors", "ie", "wp-admin");
        $gf_required_styles = array(
            "common" => array(),
            "gf_edit_forms" => array("thickbox"),
            "gf_edit_forms_notification" => array("thickbox", "editor-buttons", "wp-jquery-ui-dialog"),
            "gf_new_form" => array("thickbox"),
            "gf_entries" => array("thickbox"),
            "gf_settings" => array(),
            "gf_export" => array(),
            "gf_help" => array()
        );

        self::no_conflict_mode($wp_styles, $wp_required_styles, $gf_required_styles, "styles");
    }

    public static function no_conflict_mode_script(){
        if(!get_option("gform_enable_noconflict"))
            return;

        global $wp_scripts;

        $wp_required_scripts = array("admin-bar", "common", "jquery-color", "utils");
        $gf_required_scripts = array(
            "common" => array("qtip-init", "sack"),
            "gf_edit_forms" => array("thickbox", "jquery-ui-core", "jquery-ui-sortable", "jquery-ui-tabs", "rg_currency", "gforms_gravityforms" ),
            "gf_edit_forms_notification" => array("editor", "word-count", "quicktags", "wpdialogs-popup", "media-upload", "wplink"),
            "gf_new_form" => array("thickbox", "jquery-ui-core", "jquery-ui-sortable", "jquery-ui-tabs", "rg_currency", "gforms_gravityforms" ),
            "gf_entries" => array("thickbox", "gforms_gravityforms"),
            "gf_settings" => array(),
            "gf_export" => array(),
            "gf_help" => array(),
        );

        self::no_conflict_mode($wp_scripts, $wp_required_scripts, $gf_required_scripts, "scripts");
    }

    private static function no_conflict_mode(&$wp_objects, $wp_required_objects, $gf_required_objects, $type="scripts"){

        $current_page = trim(strtolower(rgget("page")));
        if(empty($current_page))
            $current_page = trim(strtolower(rgget("gf_page")));
        if(empty($current_page))
            $current_page = RG_CURRENT_PAGE;

        $view = rgempty("view", $_GET) ? "default" : rgget("view");
        $page_objects = isset($gf_required_objects[$current_page . "_" . $view]) ? $gf_required_objects[$current_page . "_" . $view] : rgar($gf_required_objects, $current_page);

        //disable no-conflict if $page_objects is false
        if($page_objects === false)
            return;

        if(!is_array($page_objects))
            $page_objects = array();

        //merging wp scripts with gravity forms scripts
        $required_objects = array_merge($wp_required_objects, $gf_required_objects["common"], $page_objects);

        //allowing addons or other products to change the list of no conflict scripts
        $required_objects = apply_filters("gform_noconflict_{$type}", $required_objects);

        $queue = array();
        foreach($wp_objects->queue as $object){
            if(in_array($object, $required_objects))
                $queue[] = $object;
        }
        $wp_objects->queue = $queue;

        $required_objects = self::add_script_dependencies($wp_objects->registered, $required_objects);

        //unregistering scripts
        $registered = array();
        foreach($wp_objects->registered as $script_name => $script_registration){
            if(in_array($script_name, $required_objects)){
                $registered[$script_name] = $script_registration;
            }
        }
        $wp_objects->registered = $registered;
    }

    private static function add_script_dependencies($registered, $scripts){

        //gets all dependent scripts linked to the $scripts array passed
        do{
            $dependents = array();
            foreach($scripts as $script){
                $deps = isset($registered[$script]) && is_array($registered[$script]->deps) ? $registered[$script]->deps : array();
                foreach($deps as $dep){
                    if(!in_array($dep, $scripts) && !in_array($dep, $dependents)){
                        $dependents[] = $dep;
                    }
                }
            }
            $scripts = array_merge($scripts, $dependents);
        }while(!empty($dependents));

        return $scripts;
    }

    //Integration with ManageWP
    public static function premium_update_push( $premium_update ){

        if( !function_exists( 'get_plugin_data' ) )
            include_once( ABSPATH.'wp-admin/includes/plugin.php');

        $update = GFCommon::get_version_info();
        if( $update["is_valid_key"] == true && version_compare(GFCommon::$version, $update["version"], '<') ){
            $gforms = get_plugin_data( __FILE__ );
            $gforms['type'] = 'plugin';
            $gforms['slug'] = 'gravityforms/gravityforms.php';
            $gforms['new_version'] = isset($update['version']) ? $update['version'] : false ;
            $premium_update[] = $gforms;
        }

        return $premium_update;
    }

    //Integration with ManageWP
    public static function premium_update( $premium_update ){

        if( !function_exists( 'get_plugin_data' ) )
            include_once( ABSPATH.'wp-admin/includes/plugin.php');

        $update = GFCommon::get_version_info();
        if( $update["is_valid_key"] == true && version_compare(GFCommon::$version, $update["version"], '<') ){
            $gforms = get_plugin_data( __FILE__ );
            $gforms['slug'] = 'gravityforms/gravityforms.php'; // If not set by default, always pass theme template
            $gforms['type'] = 'plugin';
            $gforms['url'] = isset($update["url"]) ? $update["url"] : false; // OR provide your own callback function for managing the update

            array_push($premium_update, $gforms);
        }
        return $premium_update;
    }

    private static function drop_index($table, $index){
        global $wpdb;
        $has_index = $wpdb->get_var("SHOW INDEX FROM {$table} WHERE Key_name='{$index}'");
        if($has_index){
            $wpdb->query("DROP INDEX {$index} ON {$table}");
        }
    }

    private static function add_empty_index_files(){
        $upload_root = RGFormsModel::get_upload_root();
        GFCommon::recursive_add_index_file($upload_root);
    }

    private static function has_database_permission(&$error){
        global $wpdb;

        $wpdb->hide_errors();

        $has_permission = true;

        $sql = "CREATE TABLE IF NOT EXISTS {$wpdb->prefix}rg_test ( col1 int )";
        $wpdb->query($sql);
        $error = "Current database user does not have necessary permissions to create tables.";
        if(!empty($wpdb->last_error))
            $has_permission = false;

        $sql = "ALTER TABLE {$wpdb->prefix}rg_test ADD COLUMN a" . uniqid() ." int";
        $wpdb->query($sql);
        $error = "Current database user does not have necessary permissions to modify (ALTER) tables.";
        if(!empty($wpdb->last_error))
            $has_permission = false;

        $sql = "DROP TABLE {$wpdb->prefix}rg_test";
        $wpdb->query($sql);

        $wpdb->show_errors();

        return $has_permission;
    }

    //Changes checkbox entry values from "!" to the current choice text. Neededed when upgrading users from 1.0
    private static function fix_checkbox_value(){
        global $wpdb;

        $table_name = RGFormsModel::get_lead_details_table_name();

        $sql = "select * from $table_name where value= '!'";
        $results = $wpdb->get_results($sql);
        foreach($results as $result){
            $form = RGFormsModel::get_form_meta($result->form_id);
            $field = RGFormsModel::get_field($form, $result->field_number);
            if($field["type"] == "checkbox"){
                $input = GFCommon::get_input($field, $result->field_number);
                $wpdb->update($table_name, array("value" => $input["label"]), array("id" => $result->id));
            }
        }
    }

    public static function user_has_cap($all_caps, $cap, $args){
        $gf_caps = GFCommon::all_caps();
        $capability = rgar($cap, 0);
        if($capability != "gform_full_access"){
            return $all_caps;
        }

        if(!self::has_members_plugin()){
            //give full access to administrators if the members plugin is not installed
            if(current_user_can("administrator") || is_super_admin()){
                $all_caps["gform_full_access"] = true;
            }
        }
        else if(current_user_can("administrator")|| is_super_admin()){

            //checking if user has any GF permission.
            $has_gf_cap = false;
            foreach($gf_caps as $gf_cap){
                if(rgar($all_caps, $gf_cap))
                    $has_gf_cap = true;
            }

            if(!$has_gf_cap){
                //give full access to administrators if none of the GF permissions are active by the Members plugin
                $all_caps["gform_full_access"] = true;
            }
        }

        return $all_caps;
    }

    //Target of Member plugin filter. Provides the plugin with Gravity Forms lists of capabilities
    public static function members_get_capabilities( $caps ) {
        return array_merge($caps, GFCommon::all_caps());
    }

    //Tests if the upload folder is writable and displays an error message if not
    public static function check_upload_folder(){
        //check if upload folder is writable
        $folder = RGFormsModel::get_upload_root();
        if(empty($folder))
            echo "<div class='error'>Upload folder is not writable. Export and file upload features will not be functional.</div>";
    }

    //Prints common admin scripts
    public static function print_scripts(){
        wp_enqueue_script("sack");
        wp_print_scripts();
    }

    public static function is_gravity_ajax_action(){
        //Gravity Forms AJAX requests
        $current_action = self::post("action");
        $gf_ajax_actions = array('rg_save_form', 'rg_change_input_type', 'rg_add_field', 'rg_duplicate_field',
                                 'rg_delete_field', 'rg_select_export_form', 'rg_start_export', 'gf_upgrade_license',
                                 'gf_delete_custom_choice', 'gf_save_custom_choice', 'gf_get_notification_post_categories',
                                 'rg_update_lead_property', 'delete-gf_entry', 'rg_update_form_active',
                                 'gf_resend_notifications', 'rg_dismiss_upgrade');

        if(defined("DOING_AJAX") && DOING_AJAX && in_array($current_action, $gf_ajax_actions))
            return true;

        //not a gravity forms ajax request.
        return false;
    }

    //Returns true if the current page is one of Gravity Forms pages. Returns false if not
    public static function is_gravity_page(){

        //Gravity Forms pages
        $current_page = trim(strtolower(self::get("page")));
        $gf_pages = array("gf_edit_forms","gf_new_form","gf_entries","gf_settings","gf_export","gf_help");

        return in_array($current_page, $gf_pages);
    }

    public static function do_menu_page(){
        $args = array( 'show_ui' => true, '_builtin' => false, 'show_in_menu' => true );
        $count = (int) count(get_post_types( $args ));
        return $count > 0;
    }

    //Creates "Forms" left nav
    public static function create_menu(){

        $has_full_access = current_user_can("gform_full_access");
        $min_cap = GFCommon::current_user_can_which(GFCommon::all_caps());
        if(empty($min_cap))
            $min_cap = "gform_full_access";

        $addon_menus = array();
        $addon_menus = apply_filters("gform_addon_navigation", $addon_menus);

        $parent_menu = self::get_parent_menu($addon_menus);

        // Add a top-level left nav
        $update_icon = GFCommon::has_update() ? "<span title='" . esc_attr(__("Update Available", "alien")) . "' class='update-plugins count-1'><span class='update-count'>1</span></span>" : "";


        //Getting around a Wordpress bug that prevents menus from displayeing when site has multiple custom post types
        if( self::do_menu_page() )
            add_menu_page(__('Forms', "gravityforms"), __("Forms", "gravityforms") . $update_icon , $has_full_access ? "gform_full_access" : $min_cap, $parent_menu["name"] , $parent_menu["callback"], GFCommon::get_base_url() . '/images/gravity-admin-icon.png', 16.9);
        else
            add_object_page(__('Forms', "gravityforms"), __("Forms", "gravityforms") . $update_icon , $has_full_access ? "gform_full_access" : $min_cap, $parent_menu["name"] , $parent_menu["callback"], GFCommon::get_base_url() . '/images/gravity-admin-icon.png');

        // Adding submenu pages
        add_submenu_page($parent_menu["name"], __("Forms", "gravityforms"), __("Forms", "gravityforms"), $has_full_access ? "gform_full_access" : "gravityforms_edit_forms", "gf_edit_forms", array("RGForms", "forms"));

        add_submenu_page($parent_menu["name"], __("New Form", "gravityforms"), __("New Form", "gravityforms"), $has_full_access ? "gform_full_access" : "gravityforms_create_form", "gf_new_form", array("RGForms", "new_form"));

        add_submenu_page($parent_menu["name"], __("Entries", "gravityforms"), __("Entries", "gravityforms"), $has_full_access ? "gform_full_access" : "gravityforms_view_entries", "gf_entries", array("RGForms", "all_leads_page"));

        if(is_array($addon_menus)){
            foreach($addon_menus as $addon_menu)
                add_submenu_page($parent_menu["name"], $addon_menu["label"], $addon_menu["label"], $has_full_access ? "gform_full_access" : $addon_menu["permission"], $addon_menu["name"], $addon_menu["callback"]);
        }

        add_submenu_page($parent_menu["name"], __("Settings", "gravityforms"), __("Settings", "gravityforms"), $has_full_access ? "gform_full_access" : "gravityforms_view_settings", "gf_settings", array("RGForms", "settings_page"));

        add_submenu_page($parent_menu["name"], __("Import/Export", "gravityforms"), __("Import/Export", "gravityforms"), $has_full_access ? "gform_full_access" : "gravityforms_export_entries", "gf_export", array("RGForms", "export_page"));

        if(current_user_can("install_plugins")){
            add_submenu_page($parent_menu["name"], __("Updates", "gravityforms"), __("Updates", "gravityforms"), $has_full_access ? "gform_full_access" : "gravityforms_view_updates", "gf_update", array("RGForms", "update_page"));
            add_submenu_page($parent_menu["name"], __("Add-Ons", "gravityforms"), __("Add-Ons", "gravityforms"), $has_full_access ? "gform_full_access" : "gravityforms_view_addons", "gf_addons", array("RGForms", "addons_page"));
        }

        add_submenu_page($parent_menu["name"], __("Help", "gravityforms"), __("Help", "gravityforms"), $has_full_access ? "gform_full_access" : $min_cap, "gf_help", array("RGForms", "help_page"));

    }

    //Returns the parent menu item. It needs to be the same as the first sub-menu (otherwise WP will duplicate the main menu as a sub-menu)
    public static function get_parent_menu($addon_menus){

        if(GFCommon::current_user_can_any("gravityforms_edit_forms"))
            $parent = array("name" => "gf_edit_forms", "callback" => array("RGForms", "forms"));

        else if(GFCommon::current_user_can_any("gravityforms_create_form"))
            $parent = array("name" => "gf_new_form", "callback" => array("RGForms", "new_form"));

        else if(GFCommon::current_user_can_any("gravityforms_view_entries"))
            $parent = array("name" => "gf_entries", "callback" => array("RGForms", "all_leads_page"));

        else if(is_array($addon_menus) && sizeof($addon_menus) > 0){
            foreach($addon_menus as $addon_menu)
                if(GFCommon::current_user_can_any($addon_menu["permission"]))
                {
                    $parent = array("name" => $addon_menu["name"], "callback" => $addon_menu["callback"]);
                    break;
                }
        }
        else if(GFCommon::current_user_can_any("gravityforms_view_settings"))
            $parent = array("name" => "gf_settings", "callback" => array("RGForms", "settings_page"));

        else if(GFCommon::current_user_can_any("gravityforms_export_entries"))
            $parent = array("name" => "gf_export", "callback" => array("RGForms", "export_page"));

        else if(GFCommon::current_user_can_any("gravityforms_view_updates"))
            $parent = array("name" => "gf_update", "callback" => array("RGForms", "update_page"));

        else if(GFCommon::current_user_can_any("gravityforms_view_addons"))
            $parent = array("name" => "gf_addons", "callback" => array("RGForms", "addons_page"));

        else if(GFCommon::current_user_can_any(GFCommon::all_caps()))
            $parent = array("name" => "gf_help", "callback" => array("RGForms", "help_page"));

        return $parent;
    }

    //Parses the [gravityform shortcode and returns the front end form UI
    public static function parse_shortcode($attributes, $content = null){
        extract(shortcode_atts(array(
             'title' => true,
             'description' => true,
             'id' => 0,
             'name' => '',
             'field_values' => "",
             'ajax' => false,
             'tabindex' => 1,
             'action' => 'form'
          ), $attributes));

        $shortcode_string = "";

        switch($action) {
            case 'conditional':
                $shortcode_string = GFCommon::conditional_shortcode($attributes, $content);
            break;

            case 'form' :
                //displaying form
                $title = strtolower($title) == "false" ? false : true;
                $description = strtolower($description) == "false" ? false : true;
                $field_values = htmlspecialchars_decode($field_values);
                $field_values = str_replace("&#038;", "&", $field_values);

                $ajax = strtolower($ajax) == "true" ? true : false;

                //using name to lookup form if id is not specified
                if(empty($id))
                    $id = $name;

                parse_str($field_values, $field_value_array); //parsing query string like string for field values and placing them into an associative array
                $field_value_array = stripslashes_deep($field_value_array);

                $shortcode_string = self::get_form($id, $title, $description, false, $field_value_array, $ajax, $tabindex);

            break;
        }

        $shortcode_string = apply_filters("gform_shortcode_{$action}", $shortcode_string, $attributes, $content);

        return $shortcode_string;
    }

    //-------------------------------------------------
    //----------- AJAX --------------------------------

    public static function ajax_parse_request($wp) {

        if (isset($_POST["gform_ajax"])) {
            parse_str($_POST["gform_ajax"]);

            require_once(GFCommon::get_base_path() . "/form_display.php");
            $result = GFFormDisplay::get_form($form_id, $title, $description, false, $_POST["gform_field_values"], true);
            die($result);
        }
    }

//------------------------------------------------------
//------------- PAGE/POST EDIT PAGE ---------------------

    //Action target that adds the "Insert Form" button to the post/page edit screen
    public static function add_form_button($context){
        $is_post_edit_page = in_array(RG_CURRENT_PAGE, array('post.php', 'page.php', 'page-new.php', 'post-new.php'));
        if(!$is_post_edit_page)
            return $context;

        $image_btn = GFCommon::get_base_url() . "/images/form-button.png";
        $out = '<a href="#TB_inline?width=480&inlineId=select_gravity_form" class="thickbox" id="add_gform" title="' . __("Add Gravity Form", 'gravityforms') . '"><img src="'.$image_btn.'" alt="' . __("Add Gravity Form", 'gravityform') . '" /></a>';
        return $context . $out;
    }

    //Action target that displays the popup to insert a form to a post/page
    public static function add_mce_popup(){
        ?>
        <script>
            function InsertForm(){
                var form_id = jQuery("#add_form_id").val();
                if(form_id == ""){
                    alert("<?php _e("Please select a form", "gravityforms") ?>");
                    return;
                }

                var form_name = jQuery("#add_form_id option[value='" + form_id + "']").text().replace(/[\[\]]/g, '');
                var display_title = jQuery("#display_title").is(":checked");
                var display_description = jQuery("#display_description").is(":checked");
                var ajax = jQuery("#gform_ajax").is(":checked");
                var title_qs = !display_title ? " title=\"false\"" : "";
                var description_qs = !display_description ? " description=\"false\"" : "";
                var ajax_qs = ajax ? " ajax=\"true\"" : "";

                window.send_to_editor("[gravityform id=\"" + form_id + "\" name=\"" + form_name + "\"" + title_qs + description_qs + ajax_qs + "]");
            }
        </script>

        <div id="select_gravity_form" style="display:none;">
            <div class="wrap">
                <div>
                    <div style="padding:15px 15px 0 15px;">
                        <h3 style="color:#5A5A5A!important; font-family:Georgia,Times New Roman,Times,serif!important; font-size:1.8em!important; font-weight:normal!important;"><?php _e("Insert A Form", "gravityforms"); ?></h3>
                        <span>
                            <?php _e("Select a form below to add it to your post or page.", "gravityforms"); ?>
                        </span>
                    </div>
                    <div style="padding:15px 15px 0 15px;">
                        <select id="add_form_id">
                            <option value="">  <?php _e("Select a Form", "gravityforms"); ?>  </option>
                            <?php
                                $forms = RGFormsModel::get_forms(1, "title");
                                foreach($forms as $form){
                                    ?>
                                    <option value="<?php echo absint($form->id) ?>"><?php echo esc_html($form->title) ?></option>
                                    <?php
                                }
                            ?>
                        </select> <br/>
                        <div style="padding:8px 0 0 0; font-size:11px; font-style:italic; color:#5A5A5A"><?php _e("Can't find your form? Make sure it is active.", "gravityforms"); ?></div>
                    </div>
                    <div style="padding:15px 15px 0 15px;">
                        <input type="checkbox" id="display_title" checked='checked' /> <label for="display_title"><?php _e("Display form title", "gravityforms"); ?></label> &nbsp;&nbsp;&nbsp;
                        <input type="checkbox" id="display_description" checked='checked' /> <label for="display_description"><?php _e("Display form description", "gravityforms"); ?></label>&nbsp;&nbsp;&nbsp;
                        <input type="checkbox" id="gform_ajax" /> <label for="gform_ajax"><?php _e("Enable AJAX", "gravityforms"); ?></label>
                    </div>
                    <div style="padding:15px;">
                        <input type="button" class="button-primary" value="Insert Form" onclick="InsertForm();"/>&nbsp;&nbsp;&nbsp;
                    <a class="button" style="color:#bbb;" href="#" onclick="tb_remove(); return false;"><?php _e("Cancel", "gravityforms"); ?></a>
                    </div>
                </div>
            </div>
        </div>

        <?php
    }


    //------------------------------------------------------
    //------------- PLUGINS PAGE ---------------------------
    //------------------------------------------------------

    public static function plugin_settings_link( $links, $file ) {
        if ( $file != plugin_basename( __FILE__ ))
            return $links;

        array_unshift($links, '<a href="' . admin_url("admin.php") . '?page=gf_settings">' . __( 'Settings', 'gravityforms' ) . '</a>');

        return $links;
    }

    //Displays message on Plugin's page
    public static function plugin_row($plugin_name){

        $key = GFCommon::get_key();
        $version_info = GFCommon::get_version_info();

        if(!$version_info["is_valid_key"]){

            $plugin_name = "gravityforms/gravityforms.php";

            $new_version = version_compare(GFCommon::$version, $version_info["version"], '<') ? __('There is a new version of Gravity Forms available.', 'gravityforms') .' <a class="thickbox" title="Gravity Forms" href="plugin-install.php?tab=plugin-information&plugin=gravityforms&TB_iframe=true&width=640&height=808">'. sprintf(__('View version %s Details', 'gravityforms'), $version_info["version"]) . '</a>. ' : '';
            echo '</tr><tr class="plugin-update-tr"><td colspan="3" class="plugin-update"><div class="update-message">' . $new_version . __('<a href="admin.php?page=gf_settings">Register</a> your copy of Gravity Forms to receive access to automatic upgrades and support. Need a license key? <a href="http://www.gravityforms.com">Purchase one now</a>.', 'gravityforms') . '</div></td>';
        }
    }

    //Displays current version details on Plugin's page
    public static function display_changelog(){
        if($_REQUEST["plugin"] != "gravityforms")
            return;

        $page_text = self::get_changelog();
        echo $page_text;

        exit;
    }

    public static function get_changelog(){
        $key = GFCommon::get_key();
        $body = "key=$key";
        $options = array('method' => 'POST', 'timeout' => 3, 'body' => $body);
        $options['headers'] = array(
            'Content-Type' => 'application/x-www-form-urlencoded; charset=' . get_option('blog_charset'),
            'Content-Length' => strlen($body),
            'User-Agent' => 'WordPress/' . get_bloginfo("version"),
            'Referer' => get_bloginfo("url")
        );

        $raw_response = wp_remote_request(GRAVITY_MANAGER_URL . "/changelog.php?" . GFCommon::get_remote_request_params(), $options);

        if ( is_wp_error( $raw_response ) || 200 != $raw_response['response']['code']){
            $page_text = __("Oops!! Something went wrong.<br/>Please try again or <a href='http://www.gravityforms.com'>contact us</a>.", 'gravityforms');
        }
        else{
            $page_text = $raw_response['body'];
            if(substr($page_text, 0, 10) != "<!--GFM-->")
                $page_text = "";
        }
        return stripslashes($page_text);
    }

//------------------------------------------------------
//-------------- DASHBOARD PAGE -------------------------

    //Registers the dashboard widget
    public static function dashboard_setup(){
        $dashboard_title = apply_filters("gform_dashboard_title", __("Forms", "gravityforms"));
        wp_add_dashboard_widget('rg_forms_dashboard', $dashboard_title,  array('RGForms', 'dashboard'));
    }

    //Displays the dashboard UI
    public static function dashboard(){
        $forms = RGFormsModel::get_form_summary();

        if(sizeof($forms) > 0){
            ?>
            <table class="widefat" cellspacing="0" style="border:0px;">
                <thead>
                    <tr>
                        <td style="text-align:left; padding:8px 18px!important; font-weight:bold;"><i><?php _e("Title", "gravityforms") ?></i></td>
                        <td style="text-align:center; padding:8px 18px!important; font-weight:bold;"><i><?php _e("Unread", "gravityforms") ?></i></td>
                        <td style="text-align:center; padding:8px 18px!important; font-weight:bold;"><i><?php _e("Total", "gravityforms") ?></i></td>
                    </tr>
                </thead>

                <tbody class="list:user user-list">
                    <?php
                    foreach($forms as $form){
                        $date_display = GFCommon::format_date($form["last_lead_date"]);
                        if(!empty($form["total_leads"])){
                            ?>
                            <tr class='author-self status-inherit' valign="top">
                                <td class="column-title" style="padding:8px 18px;">
                                    <a style="display:inline; <?php echo  $form["unread_count"] > 0 ? "font-weight:bold;" : "" ?>" href="admin.php?page=gf_entries&view=entries&id=<?php echo absint($form["id"]) ?>" title="<?php echo esc_html($form["title"]) ?> : <?php _e("View All Entries", "gravityforms") ?>"><?php echo esc_html($form["title"]) ?></a>
                                </td>
                                <td class="column-date" style="padding:8px 18px; text-align:center;"><a style="<?php echo $form["unread_count"] > 0 ? "font-weight:bold;" : "" ?>" href="admin.php?page=gf_entries&view=entries&filter=unread&id=<?php echo absint($form["id"]) ?>" title="<?php printf(__("Last Entry: %s", "gravityforms"), $date_display); ?>"><?php echo absint($form["unread_count"]) ?></a></td>
                                <td class="column-date" style="padding:8px 18px; text-align:center;"><a href="admin.php?page=gf_entries&view=entries&id=<?php echo absint($form["id"]) ?>" title="<?php _e("View All Entries", "gravityforms") ?>"><?php echo absint($form["total_leads"]) ?></a></td>
                            </tr>
                            <?php
                        }
                    }
                    ?>
                </tbody>
            </table>

            <p class="textright">
            <a class="button" href="admin.php?page=gf_edit_forms"><?php _e("View All Forms", "gravityforms") ?></a>
          </p>
            <?php
        }
        else{
            ?>
            <div>
                <?php echo sprintf(__("You don't have any forms. Let's go %s create one %s!", 'gravityforms'), '<a href="admin.php?page=gf_new_form">', '</a>'); ?>
            </div>
            <?php
        }

        if(GFCommon::current_user_can_any("gravityforms_view_updates") && (!function_exists("is_multisite") || !is_multisite() || is_super_admin())){
            //displaying update message if there is an update and user has permission
            self::dashboard_update_message();
        }
    }

    public static function dashboard_update_message(){
        $version_info = GFCommon::get_version_info();

        //don't display a message if use has dismissed the message for this version
        $ary_dismissed = get_option("gf_dismissed_upgrades");

        $is_dismissed = !empty($ary_dismissed) && in_array($version_info["version"], $ary_dismissed);

        if($is_dismissed)
            return;

        if(version_compare(GFCommon::$version, $version_info["version"], '<')) {
            $auto_upgrade = "";

            /*if($version_info["is_valid_key"]){
                $plugin_file = "gravityforms/gravityforms.php";
                $upgrade_url = wp_nonce_url('update.php?action=upgrade-plugin&amp;plugin=' . urlencode($plugin_file), 'upgrade-plugin_' . $plugin_file);
                $auto_upgrade = sprintf(__(" or %sUpgrade Automatically%s", "gravityforms"), "<a href='{$upgrade_url}'>", "</a>");
            }*/
            $message = sprintf(__("There is an update available for Gravity Forms. %sView Details%s %s", "gravityforms"), "<a href='admin.php?page=gf_update'>", "</a>", $auto_upgrade);
            ?>
            <div class='updated' style='padding:15px; position:relative;' id='gf_dashboard_message'><?php echo $message ?>
                <a href="javascript:void(0);" onclick="AlienDismissUpgrade();" style='float:right;'><?php _e("Dismiss", "gravityforms") ?></a>
            </div>
            <script type="text/javascript">
                function AlienDismissUpgrade(){
                    jQuery("#gf_dashboard_message").slideUp();
                    jQuery.post(ajaxurl, {action:"rg_dismiss_upgrade", version:"<?php echo $version_info["version"] ?>"});
                }
            </script>
            <?php
        }
    }

    public static function dashboard_dismiss_upgrade(){
        $ary = get_option("gf_dismissed_upgrades");
        if(!is_array($ary))
            $ary = array();

        $ary[] = $_POST["version"];
        update_option("gf_dismissed_upgrades", $ary);
    }


//------------------------------------------------------
//--------------- ALL OTHER PAGES ---------------------

    public static function get_form($form_id, $display_title=true, $display_description=true, $force_display=false, $field_values=null, $ajax=false, $tabindex = 1){
        require_once(GFCommon::get_base_path() . "/form_display.php");
        return GFFormDisplay::get_form($form_id, $display_title, $display_description, $force_display, $field_values, $ajax, $tabindex);
    }

    public static function new_form(){
        self::forms_page(0);
    }

    public static function enqueue_scripts(){
        require_once(GFCommon::get_base_path() . "/form_display.php");
        GFFormDisplay::enqueue_scripts();
    }

    public static function print_form_scripts($form, $ajax){
        require_once(GFCommon::get_base_path() . "/form_display.php");
        GFFormDisplay::print_form_scripts($form, $ajax);
    }

    public static function forms_page($form_id){
        require_once(GFCommon::get_base_path() . "/form_detail.php");
        GFFormDetail::forms_page($form_id);
    }

    public static function settings_page(){
        require_once(GFCommon::get_base_path() . "/settings.php");
        GFSettings::settings_page();
    }

    public static function add_settings_page($name, $handle, $icon_path=""){
        require_once(GFCommon::get_base_path() . "/settings.php");
        GFSettings::add_settings_page($name, $handle, $icon_path);
    }

    public static function help_page(){
        require_once(GFCommon::get_base_path() . "/help.php");
        GFHelp::help_page();
    }

    public static function export_page(){
        require_once(GFCommon::get_base_path() . "/export.php");
        GFExport::export_page();
    }

    public static function update_page(){
        require_once(GFCommon::get_base_path() . "/update.php");
        GFUpdate::update_page();
    }

    public static function addons_page(){

        wp_print_scripts("thickbox");
        wp_print_styles(array("thickbox"));

        $plugins = get_plugins();
        $installed_plugins = array();
        foreach($plugins as $key => $plugin){
            $is_active = is_plugin_active($key);
            $installed_plugin = array("plugin" => $key, "name" => $plugin["Name"], "is_active"=>$is_active);
            $installed_plugin["activation_url"] = $is_active ? "" : wp_nonce_url("plugins.php?action=activate&plugin={$key}", "activate-plugin_{$key}");
            $installed_plugin["deactivation_url"] = !$is_active ? "" : wp_nonce_url("plugins.php?action=deactivate&plugin={$key}", "deactivate-plugin_{$key}");

            $installed_plugins[] = $installed_plugin;
        }

        $nonces = self::get_addon_nonces();

        $body = array("plugins" => urlencode(serialize($installed_plugins)), "nonces" => urlencode(serialize($nonces)), "key" => GFCommon::get_key());
        $options = array('body' => $body, 'headers' => array('Referer' => get_bloginfo("url")));

        $request_url = GRAVITY_MANAGER_URL . "/api.php?op=plugin_browser&{$_SERVER["QUERY_STRING"]}";
        $raw_response = wp_remote_post($request_url, $options);

         if ( is_wp_error( $raw_response ) || $raw_response['response']['code'] != 200){
            echo "<div class='error' style='margin-top:50px; padding:20px;'>" . __("Add-On browser is currently unavailable. Please try again later.", "gravityforms") . "</div>";
         }
         else{
            echo GFCommon::get_remote_message();
            echo $raw_response["body"];
         }
    }

    public static function get_addon_info($api, $action, $args){
        if($action == "plugin_information" && empty($api) && !rgempty("rg", $_GET)){
            $request_url = GRAVITY_MANAGER_URL . "/api.php?op=get_plugin&slug={$args->slug}";
            $raw_response = wp_remote_post($request_url);

            if ( is_wp_error( $raw_response ) || $raw_response['response']['code'] != 200)
                return false;

            $plugin = unserialize($raw_response["body"]);

            $api = new stdClass();
            $api->name = $plugin["title"];
            $api->version = $plugin["version"];
            $api->download_link = $plugin["download_url"];
        }
        return $api;
    }

    public static function get_addon_nonces(){
        $request_url = GRAVITY_MANAGER_URL . "/api.php?op=get_plugins";
        $raw_response = wp_remote_get($request_url);

        if ( is_wp_error( $raw_response ) || $raw_response['response']['code'] != 200)
            return false;

        $addons = unserialize($raw_response["body"]);
        $nonces = array();
        foreach($addons as $addon){
            $nonces[$addon["key"]] = wp_create_nonce("install-plugin_{$addon["key"]}");
        }

        return $nonces;
    }

    public static function start_export(){
        require_once(GFCommon::get_base_path() . "/export.php");
        GFExport::start_export();
    }

    public static function get_post_category_values(){
        require_once(GFCommon::get_base_path() . "/form_detail.php");
        GFFormDetail::get_post_category_values();
    }

    public static function get_notification_post_category_values(){
        require_once(GFCommon::get_base_path() . "/notification.php");
        GFNotification::get_post_category_values();
    }

    public static function all_leads_page(){

        //displaying lead detail page if lead id is in the query string
        if(rgget('lid') || !rgblank(rgget('pos')))
        {
            require_once(GFCommon::get_base_path() . "/entry_detail.php");
            GFEntryDetail::lead_detail_page();
        }
        else{
            require_once(GFCommon::get_base_path() . "/entry_list.php");
            GFEntryList::all_leads_page();
        }
    }

    public static function form_list_page(){
        require_once(GFCommon::get_base_path() . "/form_list.php");
        GFFormList::form_list_page();
    }

    public static function forms(){
        if(!GFCommon::ensure_wp_version())
            return;

        $id = RGForms::get("id");
        $view = RGForms::get("view");

        if($view == "entries"){
            require_once(GFCommon::get_base_path() . "/entry_list.php");
            GFEntryList::leads_page($id);
        }
        else if($view == "entry"){
            require_once(GFCommon::get_base_path() . "/entry_detail.php");
            GFEntryDetail::lead_detail_page();
        }
        else if($view == "notification"){
            require_once(GFCommon::get_base_path() . "/notification.php");
            GFNotification::notification_page($id);
        }
        else if(is_numeric($id)){
            self::forms_page($id);
        }
        else{
            self::form_list_page();
        }

    }

    public static function get($name, $array=null){
        if(!$array)
            $array = $_GET;

        if(isset($array[$name]))
            return $array[$name];

        return "";
    }

    public static function post($name){
        if(isset($_POST[$name]))
            return $_POST[$name];

        return "";
    }

    // AJAX Function
    public static function resend_notifications(){

        check_admin_referer('gf_resend_notifications', 'gf_resend_notifications');

        $leads = rgpost('leadIds'); // may be a single ID or an array of IDs
        $leads = !is_array($leads) ? array($leads) : $leads;

        $form_id = rgpost('formId');
        $form = apply_filters("gform_before_resend_notifications_{$form_id}", apply_filters('gform_before_resend_notifications', RGFormsModel::get_form_meta($form_id), $leads), $leads);

        if(empty($leads) || empty($form)) {
            _e("There was an error while resending the notifications.", "gravityforms");
            die();
        };

        $send_admin = rgpost('sendAdmin');
        $send_user = rgpost('sendUser');
        $override_options = array();
        $validation_errors = array();

        if(rgpost('sendTo')) {

            if(rgpost('sendTo') && GFCommon::is_invalid_or_empty_email(rgpost('sendTo')))
                $validation_errors[] = __("The <strong>Send To</strong> email address provided is not valid.", "gravityforms");

            if(!empty($validation_errors)) {
                echo count($validation_errors) > 1 ? '<ul><li>' . implode('</li><li>', $validation_errors) . '</li></ul>' : $validation_errors[0];
                die();
            }

            $override_options['to'] = rgpost('sendTo');
            $override_options['bcc'] = ''; // overwrite bcc settings

        }

        foreach($leads as $lead_id){

            $lead = RGFormsModel::get_lead($lead_id);

            if($send_admin)
                GFCommon::send_admin_notification($form, $lead, $override_options);

            if($send_user)
                GFCommon::send_user_notification($form, $lead, $override_options);

        }

        die();

    }

//-------------------------------------------------
//----------- AJAX CALLS --------------------------
    //captcha image

    public static function captcha_image(){
        $field = array("simpleCaptchaSize" => $_GET["size"], "simpleCaptchaFontColor"=> $_GET["fg"], "simpleCaptchaBackgroundColor"=>$_GET["bg"]);
        if($_GET["type"] == "math")
            $captcha = GFCommon::get_math_captcha($field, $_GET["pos"]);
        else
            $captcha = GFCommon::get_captcha($field);

        @ini_set('memory_limit', '256M');
        $image = imagecreatefrompng($captcha["path"]);

        include_once( ABSPATH . 'wp-admin/includes/image-edit.php' );
        wp_stream_image($image, "image/png", 0);
        imagedestroy($image);
        die();
    }

    //entry list
    public static function update_form_active(){
        check_ajax_referer('rg_update_form_active','rg_update_form_active');
        RGFormsModel::update_form_active($_POST["form_id"], $_POST["is_active"]);
    }
    public static function update_lead_property(){
        check_ajax_referer('rg_update_lead_property','rg_update_lead_property');
        RGFormsModel::update_lead_property($_POST["lead_id"], $_POST["name"], $_POST["value"]);
    }

    public static function update_lead_status(){
        check_ajax_referer('gf_delete_entry');
        $status = rgpost("status");
        $lead_id = rgpost("entry");

        switch($status){
            case "unspam" :
                //TODO: call akismet and set entry as not spam.
                RGFormsModel::update_lead_property($lead_id, "status", "active");
            break;

            case "delete" :
                RGFormsModel::delete_lead($lead_id);
            break;

            default :
                RGFormsModel::update_lead_property($lead_id, "status", $status);
            break;
        }
        header("Content-Type: text/xml");
        echo "<?xml version='1.0' standalone='yes'?><wp_ajax></wp_ajax>";
        exit();

    }

    //settings
    public static function upgrade_license(){
        require_once(GFCommon::get_base_path() . "/settings.php");
        GFSettings::upgrade_license();
    }

    //form detail
    public static function save_form(){
        require_once(GFCommon::get_base_path() . "/form_detail.php");
        GFFormDetail::save_form();
    }
    public static function add_field(){
        require_once(GFCommon::get_base_path() . "/form_detail.php");
        GFFormDetail::add_field();
    }
    public static function duplicate_field(){
        require_once(GFCommon::get_base_path() . "/form_detail.php");
        GFFormDetail::duplicate_field();
    }
    public static function delete_field(){
        require_once(GFCommon::get_base_path() . "/form_detail.php");
        GFFormDetail::delete_field();
    }
    public static function change_input_type(){
        require_once(GFCommon::get_base_path() . "/form_detail.php");
        GFFormDetail::change_input_type();
    }
    public static function delete_custom_choice(){
        require_once(GFCommon::get_base_path() . "/form_detail.php");
        GFFormDetail::delete_custom_choice();
    }
    public static function save_custom_choice(){
        require_once(GFCommon::get_base_path() . "/form_detail.php");
        GFFormDetail::save_custom_choice();
    }

    //entry detail
    public static function delete_file(){
        check_ajax_referer("rg_delete_file", "rg_delete_file");
        $lead_id =  intval($_POST["lead_id"]);
        $field_id =  intval($_POST["field_id"]);

        RGFormsModel::delete_file($lead_id, $field_id);
        die("EndDeleteFile($field_id);");
    }

    //export
    public static function select_export_form(){
        check_ajax_referer("rg_select_export_form", "rg_select_export_form");
        $form_id =  intval($_POST["form_id"]);
        $form = RGFormsModel::get_form_meta($form_id);
        $fields = array();

        $form = GFExport::add_default_export_fields($form);

        if(is_array($form["fields"])){
            foreach($form["fields"] as $field){
                if(is_array(rgar($field,"inputs"))){
                    foreach($field["inputs"] as $input)
                        $fields[] =  array($input["id"], GFCommon::get_label($field, $input["id"]));
                }
                else if(!rgar($field,"displayOnly")){
                    $fields[] =  array($field["id"], GFCommon::get_label($field));
                }
            }
        }
        $field_json = GFCommon::json_encode($fields);

        die("EndSelectExportForm($field_json);");
    }

    public static function top_toolbar(){

        $forms = RGFormsModel::get_forms(null, "title");
        $id = rgempty("id", $_GET) ? count($forms) > 0 ? $forms[0]->id : "0" : rgget("id");

        ?>

        <script type="text/javascript">
            function GF_ReplaceQuery(key, newValue){
                var new_query = "";
                var query = document.location.search.substring(1);
                var ary = query.split("&");
                var has_key=false;
                for (i=0; i < ary.length; i++) {
                    var key_value = ary[i].split("=");

                    if (key_value[0] == key){
                        new_query += key + "=" + newValue + "&";
                        has_key = true;
                    }
                    else if(key_value[0] != "display_settings"){
                        new_query += key_value[0] + "=" + key_value[1] + "&";
                    }
                }

                if(new_query.length > 0)
                    new_query = new_query.substring(0, new_query.length-1);

                if(!has_key)
                    new_query += new_query.length > 0 ? "&" + key + "=" + newValue : "?" + key + "=" + newValue;

                return new_query;
            }

            function GF_RemoveQuery(key, query){
                var new_query = "";
                if (query == "")
                {
                	query = document.location.search.substring(1);
				}
                var ary = query.split("&");
                for (i=0; i < ary.length; i++) {
                    var key_value = ary[i].split("=");

                    if (key_value[0] != key){
                        new_query += key_value[0] + "=" + key_value[1] + "&";
                    }
                }

                if(new_query.length > 0)
                    new_query = new_query.substring(0, new_query.length-1);

                return new_query;
            }

            function GF_SwitchForm(id){
                if(id.length > 0){
                    query = GF_ReplaceQuery("id", id);
                    //remove paging from querystring when changing forms
                    new_query = GF_RemoveQuery("paged", query);
                   	new_query = new_query.replace("gf_new_form", "gf_edit_forms");
                    document.location = "?" + new_query;
                }
            }

            function ToggleFormSettings(){
                FieldClick(jQuery('#gform_heading')[0]);
            }

            jQuery(document).ready(function(){
                if(document.location.search.indexOf("display_settings") > 0)
                    ToggleFormSettings()

                jQuery('a.gf_toolbar_disabled').click(function(event){
                    event.preventDefault();
                });
            });

        </script>

        <div id="gf_form_toolbar">
            <ul id="gf_form_toolbar_links">

                <?php
                if(GFCommon::current_user_can_any("gravityforms_edit_forms")){
                    ?>
                    <li class="gf_form_toolbar_editor"><a href="?page=gf_edit_forms&id=<?php echo $id ?>"  <?php echo self::toolbar_class("editor"); ?>><?php _e("Form Editor", "gravityforms"); ?></a></li>
                    <li class="gf_form_toolbar_settings"><a href="javascript: if(jQuery('#gform_heading.selectable').length > 0){FieldClick(jQuery('#gform_heading')[0]);} else{document.location = '?page=gf_edit_forms&id=<?php echo $id ?>&display_settings';}" <?php echo self::toolbar_class("settings"); ?>><?php _e("Form Settings", "gravityforms"); ?></a></li>
                    <li class="gf_form_toolbar_notifications"><a href="?page=gf_edit_forms&view=notification&id=<?php echo $id ?>"  <?php echo self::toolbar_class("notifications"); ?>><?php _e("Notifications", "gravityforms"); ?></a></li>
                    <?php
                }

                if(GFCommon::current_user_can_any(array('gravityforms_view_entries','gravityforms_edit_entries','gravityforms_delete_entries'))){
                    ?>
                    <li class="gf_form_toolbar_entries"><a href="?page=gf_entries&id=<?php echo $id ?>"  <?php echo self::toolbar_class("entries"); ?>>
                        <?php echo RG_CURRENT_VIEW != 'entry' ? __("Entries", "gravityforms") : __("Entries", "gravityforms"); ?>
                    </a></li>
                    <?php
                }

                if(GFCommon::current_user_can_any(array("gravityforms_edit_forms", "gravityforms_create_form", "gravityforms_preview_forms"))){
                    ?>
                    <li class="gf_form_toolbar_preview"><a href="<?php echo site_url() ?>/?gf_page=preview&id=<?php echo $id ?>" target="_blank" <?php echo self::toolbar_class("preview"); ?>><?php _e("Preview", "gravityforms"); ?></a></li>
                    <?php
                }
                ?>

                <li class="gf_form_switcher">
                    <label for="export_form"><?php _e("Select A Form", "gravityforms") ?></label>

                    <?php
                    if(RG_CURRENT_VIEW != 'entry'){ ?>
                        <select name="form_switcher" id="form_switcher" onchange="GF_SwitchForm(jQuery(this).val());">
                            <option value=""><?php _e("Switch Form", "gravityforms") ?></option>
                            <?php
                            foreach($forms as $form_info){
                                ?>
                                <option value="<?php echo $form_info->id ?>"><?php echo $form_info->title ?></option>
                                <?php
                            }
                            ?>
                        </select>
                    <?php
                    } // end view check ?>

                </li>
            </ul>
        </div>


        <?php

    }

    private static function toolbar_class($item){

        switch($item){

            case "editor":
                if(in_array(rgget("page"), array("gf_edit_forms", "gf_new_form")) && rgempty("view", $_GET))
                    return "class='gf_toolbar_active'";
            break;

            case "notifications" :
                if(rgget("page") == "gf_new_form")
                    return "class='gf_toolbar_disabled'";
                else if(rgget("page") == "gf_edit_forms" && rgget("view") == "notification")
                    return "class='gf_toolbar_active'";

            break;

            case "entries" :
                if(rgget("page") == "gf_new_form")
                    return "class='gf_toolbar_disabled'";
                else if(rgget("page") == "gf_entries")
                    return "class='gf_toolbar_active'";

            break;

            case "preview" :
                if(rgget("page") == "gf_new_form")
                    return "class='gf_toolbar_disabled'";

            break;
        }

        return "";
    }
}

//Main function call. Should be used to insert a Gravity Form from code.
function gravity_form($id, $display_title=true, $display_description=true, $display_inactive=false, $field_values=null, $ajax=false, $tabindex = 1){
    echo RGForms::get_form($id, $display_title, $display_description, $display_inactive, $field_values, $ajax, $tabindex);
}

//Enqueues the appropriate scripts for the specified form
function gravity_form_enqueue_scripts($form_id, $is_ajax=false){
    if(!is_admin()){
        require_once(GFCommon::get_base_path() . "/form_display.php");
        $form = RGFormsModel::get_form_meta($form_id);
        GFFormDisplay::enqueue_form_scripts($form, $is_ajax);
    }
}

if(!function_exists("rgget")){
function rgget($name, $array=null){
    if(!isset($array))
        $array = $_GET;

    if(isset($array[$name]))
        return $array[$name];

    return "";
}
}

if(!function_exists("rgpost")){
function rgpost($name, $do_stripslashes=true){
    if(isset($_POST[$name]))
        return $do_stripslashes ? stripslashes_deep($_POST[$name]) : $_POST[$name];

    return "";
}
}

if(!function_exists("rgar")){
function rgar($array, $name){
    if(isset($array[$name]))
        return $array[$name];

    return '';
}
}


if(!function_exists("rgars")){
function rgars($array, $name){
    $names = explode("/", $name);
    $val = $array;
    foreach($names as $current_name){
        $val = rgar($val, $current_name);
    }
    return $val;
}
}

if(!function_exists("rgempty")){
function rgempty($name, $array = null){
    if(!$array)
        $array = $_POST;

    $val = rgget($name, $array);
    return empty($val);
}
}


if(!function_exists("rgblank")){
function rgblank($text){
    return empty($text) && strval($text) != "0";
}
}


if(!function_exists("rgobj")){
function rgobj($obj, $name){
    if(isset($obj->$name))
        return $obj->$name;

    return '';
}
}
if(!function_exists("rgexplode")){
function rgexplode($sep, $string, $count){
    $ary = explode($sep, $string);
    while(count($ary) < $count)
        $ary[] = "";

    return $ary;
}
}

?>