<?php

/**
 * Part of the Joomla Framework Console Package
 *
 * @copyright  Copyright (C) 2005 - 2021 Open Source Matters, Inc. All rights reserved.
 * @license    GNU General Public License version 2 or later; see LICENSE
 */

namespace Joomla\Console\Command;

use Joomla\Console\Helper\DescriptorHelper;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;

/**
 * Command to render a command's help data.
 *
 * @since  2.0.0
 */
class HelpCommand extends AbstractCommand
{
    /**
     * The default command name
     *
     * @var    string
     * @since  2.0.0
     */
    protected static $defaultName = 'help';

    /**
     * The command to process help for
     *
     * @var    AbstractCommand|null
     * @since  2.0.0
     */
    private $command;

    /**
     * Configure the command.
     *
     * @return  void
     *
     * @since   2.0.0
     */
    protected function configure(): void
    {
        $this->setDescription('Show the help for a command');
        $this->setHelp(
            <<<'EOF'
The <info>%command.name%</info> command displays a command's help information:

<info>php %command.full_name% list</info>

To display the list of available commands, please use the <info>list</info> command.
EOF
        );

        $this->addArgument('command_name', InputArgument::OPTIONAL, 'The command name', 'help');
    }

    /**
     * Internal function to execute the command.
     *
     * @param   InputInterface   $input   The input to inject into the command.
     * @param   OutputInterface  $output  The output to inject into the command.
     *
     * @return  integer  The command exit code
     *
     * @since   2.0.0
     */
    protected function doExecute(InputInterface $input, OutputInterface $output): int
    {
        if (!$this->command) {
            $this->command = $this->getApplication()->getCommand($input->getArgument('command_name'));
        }

        $descriptor = new DescriptorHelper();

        if ($this->getHelperSet() !== null) {
            $this->getHelperSet()->set($descriptor);
        }

        $descriptor->describe($output, $this->command);

        return 0;
    }

    /**
     * Set the command whose help is being presented.
     *
     * @param   AbstractCommand  $command  The command to process help for.
     *
     * @return  void
     *
     * @since   2.0.0
     */
    public function setCommand(AbstractCommand $command): void
    {
        $this->command = $command;
    }
}