<?php
/**
 * Class nfBackend
 *
 * @package WordPress
 * @subpackage Nix Theme Framework
 */
class nfBackend {
    /**
     * Options by key "nix"
     *
     * @var array
     */
    public $_options = array();

    /**
     * Constructor. Init all hooks
     *
     * @access  public
     */
    function nfBackend() {
        global $nix_options;
        $this->_options = &$nix_options;

        $this->processExport();

        // Add WP hooks
        add_action('admin_head', array($this, 'addThemeScripts'), 2);
        add_action('admin_head', array($this, 'addThemeStyles'),  3);
        add_action('admin_menu', array($this, 'addMenuItem'));
    }

    /**
     * Admin modules - tabs on Customize page
     *
     * @access private
     * @var array
     */
    private $_admin_modules = array();

    /**
     * Add admin module - tabs on Customize page
     *
     * @param $id : string - Module id
     * @param $module : array - meta info
     * @access public
     */
    static function addModule($id, $module) {
		$inst = self::getInstance();

		if (array_key_exists($id, $inst->_admin_modules)) {
			throw new Exception('Module with same id already exists');
		}
		$inst->_admin_modules[$id] = $module;
    }


    /**
     * Gets an instance of this singleton. If no instance exists, a new instance
     * is created and returned. If one does exist, then the existing instance is returned.
     */
    public static function getInstance() {
        static $_instance = null;
        if ($_instance === null) {
            $class = __CLASS__;
            $_instance = new $class();
        }
        return $_instance;
    }


    /**
     * add scripts by wp_head hook
     *
     * @return  void
     */
    function addThemeScripts() {
        wp_enqueue_script('jquery-ui',          NIX_DIRECTORY_URI .'/admin/js/jquery-ui.js', 'jquery');
        wp_enqueue_script('nix-settings',       NIX_DIRECTORY_URI .'/admin/js/settings.js', 'jquery');
        wp_enqueue_script('nix-messages',       NIX_DIRECTORY_URI .'/admin/js/messages.js', 'jquery');
        wp_enqueue_script('nix-colorpicker',    NIX_DIRECTORY_URI .'/admin/js/jquery.nix-colorpicker.js', 'jquery');
        wp_enqueue_script('js_quicktags',       NIX_DIRECTORY_URI .'/admin/js/js_quicktags.js');
        //wp_enqueue_script('quicktags');

        wp_print_scripts();
    }

    /**
     * add styles by wp_head hook
     *
     * @return  void
     */
    function addThemeStyles() {
		if (isset($_GET['page']) && ($_GET['page'] === 'functions.php')) {
			wp_enqueue_style('jquery-ui',NIX_DIRECTORY_URI .'/admin/css/jquery-ui.css');
		}	
		
        wp_enqueue_style('nix-settings', NIX_DIRECTORY_URI .'/admin/css/settings.css');
        wp_enqueue_style('colorpicker',  NIX_DIRECTORY_URI .'/admin/css/colorpicker.css');
        wp_print_styles();
    }


    /**
     * Add configuration page
     */
    function addMenuItem() {
        session_start();
        if ( isset( $_GET['page'] ) && $_GET['page'] == "functions.php" ) {
            if ( isset( $_REQUEST['action'] ) && 'save' == $_REQUEST['action'] ) {
                check_admin_referer('nix');

                if (isset($_REQUEST['options']) || count($_FILES['options'])) {
                    // Merge Configuration
                    global $nix_options;
                    $options = get_option(NIX_OPTION_KEY) or $options = $nix_options;
                    $data = formsGenerator::save($options, 'options');

                    // Saving
                    update_option(NIX_OPTION_KEY, $data);
                }
                // show text message
                $module = isset($_REQUEST['mod']) ? '&mod='.$_REQUEST['mod'] : '';
                wp_redirect("themes.php?page=functions.php&saved=true$module");
                die;
            }
        }
        add_theme_page(__('Customize Theme', 'nix'), __('Customize', 'nix'),
                'edit_themes', 'functions.php', array($this, 'getAdminPage'));
    }

    /**
     * Render admin page
     *
     * @return  string
     */
    function getAdminPage() {
        require_once NIX_DIRECTORY . '/admin/modules/init.php';
        
        /*@var $options array*/
        $options = $this->_options;
        ?>
<div class='wrap'>
    <div class="icon32" id="icon-themes"><br></div>
    <h2><?php _e('Customize Theme', 'nix'); ?></h2>
            <?php
            if ( isset( $_REQUEST['saved'] ) ) {
                echo '<div id="message" class="updated fade"><p><strong>'.__('Options saved.').'</strong></p></div>';
            }

            if ( isset( $_SESSION['nix-errors']) && !empty ($_SESSION['nix-errors'])) {
                echo '<div id="errors" class="error fade">';
                echo '<p><strong>'.__('Errors', 'nix').'</strong></p>';
                foreach ($_SESSION['nix-errors'] as $error) {
                    echo "<p>{$error}</p>";
                }
                echo '</div>';
                unset ($_SESSION['nix-errors']);
            }
            ?>
    <div class="nix">
        <div id="tabs">
            <ul>
                        <?php foreach ($this->_admin_modules as $id => $module) : ?>
                <li <?php if (isset($_REQUEST['mod']) && $_REQUEST['mod'] == $id) echo 'class="ui-tabs-selected"' ?>>
                    <a href="#nixtab-<?php echo $id ?>"><?php _e($module['title'], 'nix'); ?></a>
                </li>
                        <?php endforeach; ?>
            </ul>

                    <?php foreach ($this->_admin_modules as $id => $module) : ?>
            <div id="nixtab-<?php echo $id ?>" class="nixtab-body">
                <a name="nixtab-<?php echo $id ?>"></a>
                            <?php switch ($module['type']) :
                                case 'autosave' :
                                    $this->getAutosaveModule($id, $module);
                                    break; ?>

                                <?php
                                case 'autoform' :
                                    $this->getAutoformModule($id, $module);
                                    break;
                                    ?>

                                <?php
                                default:
                                    require_once NIX_DIRECTORY ."/admin/modules/$id.php";
                                    break;
                                    ?>

                                <?php endswitch; ?>
            </div>
                    <?php endforeach; ?>
        </div>
    </div>
</div>
        <?php
    }


    /**
     * getAutosaveModule
     *
     * render admin page for "autosave" module type
     *
     * @return  string
     */
    function getAutosaveModule($id, $module) {
        $options = $this->_options;
        ?>
<form enctype="multipart/form-data" method="post" id="nix-form" action="<?php echo esc_attr(add_query_arg(array('mod' => $id))); ?>">
            <?php wp_nonce_field('nix'); ?>
    <input type="hidden" name="action" value="save" />
            <?php require_once NIX_DIRECTORY ."/admin/modules/$id.php" ?>

    <p class="submit">
        <input type="submit" name="Submit" class="button-primary" value="<?php _e('Save Changes', 'nix')?>" />
    </p>
</form>
        <?php
    }


    /**
     * getAutoformModule
     *
     * render admin page for "autoform" module type
     *
     * @return  string
     */
    function getAutoformModule($id, $module) {
        $options = $this->_options;
        ?>
<form enctype="multipart/form-data" method="post" id="nix-form" action="<?php echo esc_attr(add_query_arg(array('mod' => $id))); ?>">
            <?php wp_nonce_field('nix'); ?>
    <input type="hidden" name="action" value="save" />
    <table class="form-table">
                <?php formsGenerator::generate($module['form'], $options, 'options'); ?>
    </table>
    <p class="submit">
        <input type="submit" name="Submit" class="button-primary" value="<?php _e('Save Changes', 'nix')?>" />
    </p>
</form>
        <?php
    }
	
	
    /**
     * Process Export action
     */
    public function processExport() {
		if ( isset( $_GET['page'] ) && $_GET['page'] == "functions.php" ) {
			if ( isset( $_REQUEST['action'] ) && 'export' == $_REQUEST['action'] ) { 

                header("Content-type: application/zip;");
                header("Content-Transfer-Encoding: binary");
                header("Content-Disposition: attachment; filename=\"wp-export-data.zip\";\n\n");
                
                $res = array(
                        'info' => 'wpnf-export',
                        'options' => $this->_options);
                
                echo serialize($res);
				exit;
			}
		}
    }	
	
}