<?php
/*
 * Chill is a software for social workers
 *
 * Copyright (C) 2019, Champs Libres Cooperative SCRLFS, <http://www.champs-libres.coop>
 *
 * This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

namespace Chill\MainBundle\CRUD\Resolver;

use Doctrine\ORM\EntityManagerInterface;
use Symfony\Component\PropertyAccess\PropertyAccess;

/**
 * 
 *
 */
class Resolver
{
    /**
     *
     * @var EntityManagerInterface
     */
    protected $em;
    
    /**
     *
     * @var \Symfony\Component\PropertyAccess\PropertyAccessor
     */
    protected $propertyAccess;
    
    /**
     *
     * @var array
     */
    protected $crudConfig;
    
    /**
     * @deprecated
     */
    const ROLE_VIEW = 'role.view';
    
    /**
     * @deprecated
     */
    const ROLE_EDIT = 'role.edit';
    
    /**
     * The key to get the role necessary for the action
     */
    const ROLE = 'role';
    
    function __construct(EntityManagerInterface $em, array $crudConfig)
    {
        $this->em = $em;
        
        foreach($crudConfig as $conf) {
            $this->crudConfig[$conf['name']] = $conf;
        }
        
        $this->buildPropertyAccess();
    }

    
    private function buildPropertyAccess()
    {
        $this->propertyAccess = PropertyAccess::createPropertyAccessorBuilder()
            ->enableExceptionOnInvalidIndex()
            ->getPropertyAccessor();
    }
    
    /**
     * Return the data at given path.
     * 
     * Path are given to 
     * 
     * @param object $entity
     * @param string $path
     */
    public function getData($entity, $path)
    {
        return $this->propertyAccess->getValue($entity, $path);
    }
    
    public function getConfigValue($key, $crudName, $action = null)
    {
        $config = $this->crudConfig[$crudName];
        
        switch ($key) {
            case self::ROLE:
                dump($config);
                return $config['actions'][$action]['role'] ?? $this->buildDefaultRole($crudName, $action);
        }
    }
    
    public function buildDefaultRole($crudName, $action)
    {
        if (empty($this->crudConfig[$crudName]['base_role'])) {
            throw new \LogicException(sprintf("the base role is not defined. You must define "
                . "on or override %s or %s methods", __METHOD__, "getRoleFor"));
        }
        
        return \strtoupper(
            $this->crudConfig[$crudName]['base_role'].
            '_'.
            $action);
    }
    
    public function getTwigTemplate($entity, $path): string
    {
        list($focusEntity, $subPath) = $this->getFocusedEntity($entity, $path);
        
        $classMetadata = $this->em->getClassMetadata(\get_class($focusEntity));
        $type = $classMetadata->getTypeOfField($subPath);
        
        switch ($type) {
            
            default: 
                return '@ChillMain/CRUD/_inc/default.html.twig';
        }
    }
    
    /**
     * Get the object on which the path apply
     * 
     * This methods recursively parse the path and entity and return the entity
     * which will deliver the info, and the last path.
     * 
     * @param object $entity
     * @param string $path
     * @return array [$focusedEntity, $lastPath]
     */
    private function getFocusedEntity($entity, $path)
    {
        if (\strpos($path, '.') === FALSE) {
            return [$entity, $path];
        }
        
        $exploded = \explode('.', $path);
        
        $subEntity = $this->propertyAccess
            ->getValue($entity, $exploded[0]);
        
        return $this->getFocusedEntity($subEntity, 
            \implode('.', \array_slice($exploded, 1)));
    }
}