<?php

/*
 * This file is part of Psy Shell.
 *
 * (c) 2012-2017 Justin Hileman
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Psy\Command;

use Psy\Output\ShellOutput;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;

/**
 * Interact with the current code buffer.
 *
 * Shows and clears the buffer for the current multi-line expression.
 */
class BufferCommand extends Command
{
    /**
     * {@inheritdoc}
     */
    protected function configure()
    {
        $this
            ->setName('buffer')
            ->setAliases(array('buf'))
            ->setDefinition(array(
                new InputOption('clear', '', InputOption::VALUE_NONE, 'Clear the current buffer.'),
            ))
            ->setDescription('Show (or clear) the contents of the code input buffer.')
            ->setHelp(
                <<<'HELP'
Show the contents of the code buffer for the current multi-line expression.

Optionally, clear the buffer by passing the <info>--clear</info> option.
HELP
            );
    }

    /**
     * {@inheritdoc}
     */
    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $buf = $this->getApplication()->getCodeBuffer();
        if ($input->getOption('clear')) {
            $this->getApplication()->resetCodeBuffer();
            $output->writeln($this->formatLines($buf, 'urgent'), ShellOutput::NUMBER_LINES);
        } else {
            $output->writeln($this->formatLines($buf), ShellOutput::NUMBER_LINES);
        }
    }

    /**
     * A helper method for wrapping buffer lines in `<urgent>` and `<return>` formatter strings.
     *
     * @param array  $lines
     * @param string $type  (default: 'return')
     *
     * @return array Formatted strings
     */
    protected function formatLines(array $lines, $type = 'return')
    {
        $template = sprintf('<%s>%%s</%s>', $type, $type);

        return array_map(function ($line) use ($template) {
            return sprintf($template, $line);
        }, $lines);
    }
}
