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<?php

/*
 * This file is part of Psy Shell.
 *
 * (c) 2012-2020 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\Context;
use Psy\ContextAware;
use Psy\Input\FilterOptions;
use Psy\Output\ShellOutput;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;

/**
 * Show the last uncaught exception.
 */
class WtfCommand extends TraceCommand implements ContextAware
{
    /**
     * Context instance (for ContextAware interface).
     *
     * @var Context
     */
    protected $context;

/**
     * ContextAware interface.
     *
     * @param Context $context
     */
    public function setContext(Context $context)
    {
        $this->context = $context;
    }

/**
     * {@inheritdoc}
     */
    protected function configure()
    {
        list($grep, $insensitive, $invert) = FilterOptions::getOptions();

$this
            ->setName('wtf')
            ->setAliases(['last-exception', 'wtf?'])
            ->setDefinition([
                new InputArgument('incredulity', InputArgument::OPTIONAL | InputArgument::IS_ARRAY, 'Number of lines to show.'),
                new InputOption('all', 'a', InputOption::VALUE_NONE, 'Show entire backtrace.'),

$grep,
                $insensitive,
                $invert,
            ])
            ->setDescription('Show the backtrace of the most recent exception.')
            ->setHelp(
                <<<'HELP'
Shows a few lines of the backtrace of the most recent exception.

If you want to see more lines, add more question marks or exclamation marks:

e.g.
<return>>>> wtf ?</return>
<return>>>> wtf ?!???!?!?</return>

To see the entire backtrace, pass the -a/--all flag:

e.g.
<return>>>> wtf -a</return>
HELP
            );
    }

/**
     * {@inheritdoc}
     */
    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $this->filter->bind($input);

$incredulity = \implode('', $input->getArgument('incredulity'));
        if (\strlen(\preg_replace('/[\\?!]/', '', $incredulity))) {
            throw new \InvalidArgumentException('Incredulity must include only "?" and "!"');
        }

$exception = $this->context->getLastException();
        $count = $input->getOption('all') ? \PHP_INT_MAX : \max(3, \pow(2, \strlen($incredulity) + 1));

$shell = $this->getApplication();

if ($output instanceof ShellOutput) {
            $output->startPaging();
        }

do {
            $traceCount = \count($exception->getTrace());
            $showLines = $count;
            // Show the whole trace if we'd only be hiding a few lines
            if ($traceCount < \max($count * 1.2, $count + 2)) {
                $showLines = \PHP_INT_MAX;
            }

$trace = $this->getBacktrace($exception, $showLines);
            $moreLines = $traceCount - \count($trace);

$output->writeln($shell->formatException($exception));
            $output->writeln('--');
            $output->write($trace, true, ShellOutput::NUMBER_LINES);
            $output->writeln('');

if ($moreLines > 0) {
                $output->writeln(\sprintf(
                    '<aside>Use <return>wtf -a</return> to see %d more lines</aside>',
                    $moreLines
                ));
                $output->writeln('');
            }
        } while ($exception = $exception->getPrevious());

if ($output instanceof ShellOutput) {
            $output->stopPaging();
        }

return 0;
    }
}