<?php
/*
 * Copyright (C) 2018 Champs Libres Cooperative <info@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\TaskBundle\Workflow\Definition;

use Chill\TaskBundle\Entity\AbstractTask;
use Chill\TaskBundle\Entity\SingleTask;
use Symfony\Component\Workflow\Transition;

/**
 * 
 *
 * @author Julien Fastré <julien.fastre@champs-libres.coop>
 */
class DefaultTaskDefinition implements \Chill\TaskBundle\Workflow\TaskWorkflowDefinition
{
    const TRANSITION_METADATA = [
        'close' => [
            'verb' => 'close',
            'background-color' => 'var(--yellow)', // css variable, see https://developer.mozilla.org/fr/docs/Web/CSS/Les_variables_CSS
            'text-color' => 'black'
        ],
        'cancel' => [
            'verb' => 'cancel',
            'background-color' => 'var(--red)', // css variable, see https://developer.mozilla.org/fr/docs/Web/CSS/Les_variables_CSS
            'text-color' => 'black'
        ],
        'start' => [
            'verb' => 'start',
            'background-color' => 'var(--green)', // css variable, see https://developer.mozilla.org/fr/docs/Web/CSS/Les_variables_CSS
            'text-color' => 'black'
        ]
    ];
    
    public function supports(AbstractTask $task) 
    {
        
        return $task instanceof SingleTask
            && $task->getType() === 'task_default';
    }
    
    public function getAssociatedWorkflowName()
    {
        return 'task_default';
    }
    
    public function getWorkflowMetadata(
        string $key, 
        $metadataSubject = null
    ) {
        $keys = \explode('.', $key);
        
        switch($keys[0]) {
            case 'transition':
                if (!$metadataSubject instanceof Transition) {
                    throw new \LogicException("You must give a transition as metadatasubject");
                }
        
                return $this->getTransitionMetadata(\implode('.', \array_slice($keys, 1)), $metadataSubject);
            default:
                throw new \LogicException("this key '$key' is not implemented");
        }
    }
    
    protected function getTransitionMetadata($key, Transition $transition)
    {
        if (!\array_key_exists($transition->getName(), self::TRANSITION_METADATA)) {
            throw new \LogicException("the metadata for this transition are not defined");
        }
        
        if (!\array_key_exists($key, self::TRANSITION_METADATA[$transition->getName()])) {
            throw new \LogicException("The metadata ".$key." is not "
                . "defined for the transition ".$transition.getName());
        }
        
        return self::TRANSITION_METADATA[$transition->getName()][$key];
    }
}