<?php
/**
 * Form.class.php
 * Created by Komma Mediadesign.
 * Author: mike
 * Date: 13/12/13
 */

require_once DOCUMENT_ROOT . 'lib/form/form_field.class.php';
require_once DOCUMENT_ROOT . 'lib/form/form_live_validation.class.php';


class Form
{
    /*
     * Form Name - String
     */
    private $_name;

    /*
     * XML - XML Object
     */
    private $_xml;

    /*
     * File to load - string
     */
    private $_file;

    /*
     * Form Fields - Array
     */
    private $_fields;

    /*
     * Tabs - array
     */
    private $_tabs;

    /*
     * Current tab - XML object
     */
    private $_currentTab;

    /*
     * Add or edit - String
     */
    private $_type;

    /*
     * Construct
     */
    public function __construct($name)
    {
        // Set name
        $this->_name = $name;

        // Set file
        $this->_file = DOCUMENT_ROOT . 'config/forms/' . $this->_name . '.xml.php';

        // Get XML file
        $this->load();

        // Set fields array
        $this->setFields();
    }

    /*
     * Get tabs menu
     */
    public function getTabs()
    {
        // Read tabs
        $tabs = get_object_vars($this->_xml->tabs);
        $this->_tabs = $tabs[key($tabs)];

        // Create output
        $tabs = array();

        // Are there more then one tab
        if(count($this->_tabs) > 1)
        {
            // Generate output
            foreach($this->_tabs as $tab)
            {
                // Tabs
                $tab = get_object_vars($tab);
                $tabs[] = $tab['label'];
            }
        }

        return $tabs;
    }


    /*

        G E N E R A T E

     */


    /*
     * Generate output
     * @return string
     */
    public function generate()
    {
        // Get fields on current tab
        $this->getCurrentTab();

        // Return output
        return $this->showCurrentTab();
    }

    /*
     * Load file
     * @param string
     * @return boolean
     */
    private function load()
    {
        // Check if file exists
        if(is_file($this->_file))
        {
            ob_start();
            require $this->_file ;
            $string = ob_get_contents();
            ob_end_clean();

            $this->_xml = simplexml_load_string($string);
            return true;
        }
        return false;
    }

    /*
     * Read fields from array
     */
    private function setFields()
    {
        // Get ALL Fields as array
        $fields = get_object_vars($this->_xml->fields);
        $fields=$fields[key($fields)];

        // Get Fields in current Tab as array
        $this->getCurrentTab();

        $currentFields = get_object_vars($this->_currentTab->fields);
        $currentFields = $currentFields[key($currentFields)];

        // Loop trough array
        foreach($fields as $field)
        {
            $data = get_object_vars($field);

            // Only if field is visible
            if( in_array($data['name'],$currentFields))
            {
                // Create validation array
                $temp = get_object_vars($data['validation']);
                $data['validation'] = array();
                foreach(array_keys($temp) as $validation )
                {
                    $data['validation'][] = $validation;
                }

                // Add a new field to the global fields array
                $file = DOCUMENT_ROOT . 'lib/form/types/' . strtolower($data['object']) . '.class.php';
                if(is_file($file))
                {
                    if( ! class_exists($data['object'])) require $file;

                    $this->_fields[$data['name']] = new $data['object'];
                    $this->_fields[$data['name']]->setFormName($this->_name);
                    $this->_fields[$data['name']]->setData($data);
                }
            }
        }
    }

    /*
     * Finds the current tab
     */
    private function getCurrentTab()
    {
        // Read tabs
        $tabs = get_object_vars($this->_xml->tabs);
        $this->_tabs = $tabs[key($tabs)];

        // Are there more then one tab
        if(count($this->_tabs) > 1)
        {
            // If not defined we're on the first tab
            if(defined('URL_SUB2'))
            {
                // Generate output
                foreach($this->_tabs as $tab)
                {
                    // Compare with URL
                    if(Fn::encodeUrl($tab->label) == URL_SUB2)
                    {
                        $this->_currentTab = $tab;
                    }
                }
            }
            else
            {
                // Set current tab to first tab
                $this->_currentTab = $this->_tabs[key($this->_tabs)];
            }
        }
        else
        {
            $this->_currentTab = $this->_tabs[0];
        }
    }

    /*
     * Generates output for current tab
     * @return string
     */
    private function showCurrentTab()
    {
        $output = $jsOutput = '';
        // Read fields in current tab
        $fields = get_object_vars($this->_currentTab->fields);
        $fields = $fields[key($fields)];

        foreach($fields as $i => $key)
        {
            // Certain type?
            $attr = get_object_vars($this->_currentTab->fields->field[$i]);
            if(isset($attr['@attributes']['type']))
            {
                $type = $attr['@attributes']['type'];

                switch($type)
                {
                    case 'label':
                        $output .= ' <h3>' . $key . '</h3>';
                        break;
                    case 'spacer':
                        // Leave some space between the fields
                        $output .= '<div class="spacer"></div>';
                        break;
                }
            }
            // Normal field
            else if(isset($this->_fields[$key]))
            {
                // Get Field object from global array
                $Field = $this->_fields[$key];

                // Get fields
                $output .= $Field->generate();

                // Add field live validation
                $jsOutput .= $Field->addLiveValidation();
            }
        }

        // Add live validation javascript
        if( ! empty($jsOutput))
        {
            $_SESSION['js_output'] .= '<script>' . $jsOutput . '</script>';
        }

        return $output;
    }


    /*

        V A L I D A T E

     */


    /*
     * Validate output
     * @return boolean
     */
    public function validate()
    {
        // Get Fields in current Tab as array
        $this->getCurrentTab();
        $currentFields = get_object_vars($this->_currentTab->fields);
        $currentFields = $currentFields[key($currentFields)];

        // Clear error session
        $_SESSION[$this->_name . '_errors'] = array();

        $valid = true;
        foreach($this->_fields as $name => $Field)
        {
            if( in_array($name,$currentFields))
            {
                if( ! $Field->validate())
                {
                    // set error message
                    $_SESSION[$this->_name . '_errors'][$name] = $Field->getErrors();

                    $valid = false;
                }
            }
        }

        return $valid;
    }

    /*
     * Save values in data session
     */
    public function saveValues()
    {
        foreach($_POST as $field => $value)
        {
            if(isset($_SESSION['current_item']))
            {
                // In case of existing item
                $_SESSION[$this->_name][$_SESSION['current_item']]['data'][$field] = $value;
            }
            else
            {
                // In case of new item
                $_SESSION[$this->_name]['data'][$field] = $value;
            }
        }
    }

    /*
     * Prepare values for the database
     */
    public function prepare()
    {
        // Get All fields as array
        $fields = get_object_vars($this->_xml->fields);
        $fields=$fields[key($fields)];

        // Data to store
        $data = array();

        // Get values
        foreach($fields as $field)
        {
            $fieldData = get_object_vars($field);

            // Get value
            if(isset($_SESSION['current_item']))
            {
                // In case of existing item
                $value = $_SESSION[$this->_name][$_SESSION['current_item']]['data'][$fieldData['name']];
            }
            else
            {
                // In case of new item
                $value = $_SESSION[$this->_name]['data'][$fieldData['name']];
            }

            // Check if to prepare values
            $file = DOCUMENT_ROOT . 'lib/form/types/' . $fieldData['object'] . '.class.php';
            if(is_file($file))
            {
                if( ! class_exists($fieldData['object'])) require $file;
                $TypeObject = new $fieldData['object'];
                if(method_exists($fieldData['object'],'prepareForDb'))
                {
                    $value = $TypeObject->prepareForDb($value);
                }
            }

            // Add value to data array
            $data[$fieldData['name']] = $value;
        }

        // add a timestamp to the data
        if( ! isset($data['timest']) && $_POST['form_type'] == 'add') $data['timest'] = time();

        return $data;
    }
}