<?php

/*
 * This file is part of the Behat.
 * (c) Konstantin Kudryashov <ever.zet@gmail.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Behat\Testwork\Ordering\Cli;

use Behat\Testwork\Ordering\Exception\InvalidOrderException;
use Behat\Testwork\Ordering\OrderedExercise;
use Behat\Testwork\Ordering\Orderer\Orderer;
use Behat\Testwork\Cli\Controller;
use Symfony\Component\Console\Command\Command as SymfonyCommand;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\EventDispatcher\EventDispatcherInterface;

/**
 * Preloads scenarios and then modifies the order when --order is passed
 *
 * @author Ciaran McNulty <mail@ciaranmcnulty.com>
 */
final class OrderController implements Controller
{
    /**
     * @var EventDispatcherInterface
     */
    private $eventDispatcher;
    /**
     * @var OrderedExercise
     */
    private $exercise;
    /**
     * @var array
     */
    private $orderers = array();

    /**
     * Initializes controller.
     *
     * @param EventDispatcherInterface $eventDispatcher
     * @param OrderedExercise $exercise
     */
    public function __construct(EventDispatcherInterface $eventDispatcher, OrderedExercise $exercise)
    {
        $this->eventDispatcher = $eventDispatcher;
        $this->exercise = $exercise;
    }

    /**
     * Configures command to be executable by the controller.
     *
     * @param SymfonyCommand $command
     */
    public function configure(SymfonyCommand $command)
    {
        $command->addOption('--order', null, InputOption::VALUE_REQUIRED,
            'Set an order in which to execute the specifications (this will result in slower feedback).'
        );
    }

    /**
     * Executes controller.
     *
     * @param InputInterface $input
     * @param OutputInterface $output
     *
     * @return null|integer
     */
    public function execute(InputInterface $input, OutputInterface $output)
    {
        $orderer = $input->getOption('order');

        if (!$orderer) {
            return;
        }

        if (!array_key_exists($orderer, $this->orderers)) {
           throw new InvalidOrderException(sprintf("Order option '%s' was not recognised", $orderer));
        }

        $this->exercise->setOrderer($this->orderers[$orderer]);
    }

    /**
     * Register a new available controller
     *
     * @param Orderer $orderer
     */
    public function registerOrderer(Orderer $orderer)
    {
        $this->orderers[$orderer->getName()] = $orderer;
    }
}