<?php

use Joomla\CMS\Factory;
use Joomla\CMS\MVC\Controller\BaseController;
use Joomla\CMS\Router\Route;

// No direct access.
defined('_JEXEC') or die;

class DataParsingException extends Exception {}
class DataInvalidException extends Exception {}

abstract class AbstractClubsController extends BaseController
{
    /**
     * @return AbstractCommonClubsModelFactory
     */
    protected abstract function getFactory();
    
    /**
     * @return string The name of the underlying object in lower letters.
     */
    protected abstract function getSingleBaseName();
    
    /**
     * @return string The name of the view to show a single object
     */
    protected function getSingleViewName()
    {
        return $this->getSingleBaseName();
    }
    
    public function new()
    {
        $factory = $this->getFactory();
        $obj = $factory->createNew();
        
        $this->saveToDatabase($obj, 'new');
    }
    
    public function change()
    {
        $app = Factory::getApplication();
        $input = $app->input;
        $id = (int) $input->post->getInt('id');
        
        $factory = $this->getFactory();
        $obj = $factory->loadById($id);
        
        $this->saveToDatabase($obj, $id);
    }
    
    /**
     * @param AbstractCommonClubsModel $obj
     * @param int $id
     */
    protected function saveToDatabase($obj, $id)
    {
        try
        {
            // Fetch the posted data
            $values = $this->loadData($this->additionalData());
            
            $this->filterRaw($values);
            
            // Check the input data
            if( ! $this->requiredDataIsAvailable($values) )
                throw new DataParsingException();
            
            if( ! $this->rawDataIsValid($values) )
                throw new DataParsingException();
            
            $obj->applyAndMergeValues($values, true);
            
            $this->filterObject($obj, $values);
            
            // Do some additional tests by the controller
            if( ! $this->objectValid($obj) )
                throw new DataInvalidException();
            
            // Check if the object complains about valitity
            if( ! $obj->dataIsValid() )
                throw new DataInvalidException();
            
            // Do the actual work
            $obj->save();
            $this->saveAssocs($obj, $values);
            
            // Redirect to the list of objects
            $view = $this->getSingleViewName();
            $this->setRedirect(Route::_("index.php?option=com_clubs&view={$view}s", false));
        }
        catch(DataParsingException $e)
        {
            // FIXME Make this robust (are external refs already dereferenced?)
            $view = $this->getSingleViewName();
            $obj->setValues($values, true);
            $urldata = $obj->pack();
            $this->setRedirect(Route::_("index.php?option=com_clubs&view={$view}&id={$id}&data={$urldata}", false));
        }
        catch(DataInvalidException $e)
        {
            $view = $this->getSingleViewName();
            $urldata = $obj->pack();
            $this->setRedirect(Route::_("index.php?option=com_clubs&view={$view}&id={$id}&data={$urldata}", false));
        }
    }
    
    protected function saveAssocs($obj, $vlaues){}
    
    protected function additionalData()
    {
        return array();
    }
    
    protected function loadData($additionalData)
    {
        $values = array();
        $factory = $this->getFactory();
        $input = Factory::getApplication()->input->post;
        
        foreach($factory->getAttributes() as $column)
        {
            $values[$column->getAlias()] = $column->getFilter()->getFilteredValue($input, $column->getAlias());
        }
        
        foreach($additionalData as $k => $v)
        {
            $values[$k] = $v->getFilteredValue($input, $k);
        }
        
        return $values;
    }
    
    protected function filterRaw(&$values){}
    
    protected function filterObject($obj){}
    
    protected function objectValid($obj)
    {
        return true;
    }
    
    private function requiredDataIsAvailable($values)
    {
        $ok = true;
        
        foreach($this->getFactory()->getAttributes() as $column)
        {
            $filter = $column->getFilter();
            if(! $filter->requiredDataAvailable($values[$column->getAlias()]))
            {
                $fname = $filter->getName();
                Factory::getApplication()->enqueueMessage("Das Feld $fname ist obligatorisch.", 'error');
                $ok = false;
            }
        }
        
        return $ok;
    }
    
    /**
     * @param array $values
     * @param AbstractCommonClubsModel $obj
     * @return boolean
     */
    protected function rawDataIsValid($values)
    {
        $error = false;
        
        $factory = $this->getFactory();
        
        foreach($factory->getAttributes() as $column)
        {
            if(! $column->getFilter()->rawValueValid($values[$column->getAlias()]))
            {
                $fname = $column->getFilter()->getName();
                Factory::getApplication()->enqueueMessage("Das Feld $fname ist fehlerhaft.", 'error');
                $error = true;
            }
        }
        
        return ! $error;
    }
    
    protected function fieldValid($name, $value, $options)
    {
        if(empty($value))
            return false;
        
        if(isset($options['filter']))
        {
            switch($options['filter'])
            {
                case 'string':
                    if(empty(trim($value)))
                        return false;
            }
        }
        
        return true;
    }
    
    function delete()
    {
        $app = Factory::getApplication();
        
        $id = $app->input->get->getInt('id');
        $name = $this->getSingleBaseName();
        $app->enqueueMessage("Removal of $name with id $id.");
        
        $factory = $this->getFactory();
        $element = $factory->loadById($id);
        $element->delete();
        
        $view = $this->getSingleViewName();
        $this->setRedirect(Route::_("index.php?option=com_clubs&view={$view}s", false));
    }
    
}