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<?php

/*

 * This file is part of Psy Shell.

 *

 * (c) 2012-2023 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 PhpParser\NodeTraverser;

use PhpParser\PrettyPrinter\Standard as Printer;

use Psy\Command\TimeitCommand\TimeitVisitor;

use Psy\Input\CodeArgument;

use Psy\ParserFactory;

use Symfony\Component\Console\Input\InputInterface;

use Symfony\Component\Console\Input\InputOption;

use Symfony\Component\Console\Output\OutputInterface;

/**

 * Class TimeitCommand.

 */

class TimeitCommand extends Command

{

    const RESULT_MSG = '<info>Command took %.6f seconds to complete.</info>';

    const AVG_RESULT_MSG = '<info>Command took %.6f seconds on average (%.6f median; %.6f total) to complete.</info>';

    // All times stored as nanoseconds!

    private static $useHrtime;

    private static $start = null;

    private static $times = [];

    private $parser;

    private $traverser;

    private $printer;

    /**

     * {@inheritdoc}

     */

    public function __construct($name = null)

    {

        // @todo Remove microtime use after we drop support for PHP < 7.3

        self::$useHrtime = \function_exists('hrtime');

        $parserFactory = new ParserFactory();

        $this->parser = $parserFactory->createParser();

        $this->traverser = new NodeTraverser();

        $this->traverser->addVisitor(new TimeitVisitor());

        $this->printer = new Printer();

        parent::__construct($name);

    }

    /**

     * {@inheritdoc}

     */

    protected function configure()

    {

        $this

            ->setName('timeit')

            ->setDefinition([

                new InputOption('num', 'n', InputOption::VALUE_REQUIRED, 'Number of iterations.'),

                new CodeArgument('code', CodeArgument::REQUIRED, 'Code to execute.'),

            ])

            ->setDescription('Profiles with a timer.')

            ->setHelp(

                <<<'HELP'

Time profiling for functions and commands.

e.g.

<return>>>> timeit sleep(1)</return>

<return>>>> timeit -n1000 $closure()</return>

HELP

            );

    }

    /**

     * {@inheritdoc}

     *

     * @return int 0 if everything went fine, or an exit code

     */

    protected function execute(InputInterface $input, OutputInterface $output)

    {

        $code = $input->getArgument('code');

        $num = $input->getOption('num') ?: 1;

        $shell = $this->getApplication();

        $instrumentedCode = $this->instrumentCode($code);

        self::$times = [];

        for ($i = 0; $i < $num; $i++) {

            $_ = $shell->execute($instrumentedCode);

            $this->ensureEndMarked();

        }

        $shell->writeReturnValue($_);

        $times = self::$times;

        self::$times = [];

        if ($num === 1) {

            $output->writeln(\sprintf(self::RESULT_MSG, $times[0] / 1e+9));

        } else {

            $total = \array_sum($times);

            \rsort($times);

            $median = $times[\round($num / 2)];

            $output->writeln(\sprintf(self::AVG_RESULT_MSG, ($total / $num) / 1e+9, $median / 1e+9, $total / 1e+9));

        }

        return 0;

    }

    /**

     * Internal method for marking the start of timeit execution.

     *

     * A static call to this method will be injected at the start of the timeit

     * input code to instrument the call. We will use the saved start time to

     * more accurately calculate time elapsed during execution.

     */

    public static function markStart()

    {

        self::$start = self::$useHrtime ? \hrtime(true) : (\microtime(true) * 1e+6);

    }

    /**

     * Internal method for marking the end of timeit execution.

     *

     * A static call to this method is injected by TimeitVisitor at the end

     * of the timeit input code to instrument the call.

     *

     * Note that this accepts an optional $ret parameter, which is used to pass

     * the return value of the last statement back out of timeit. This saves us

     * a bunch of code rewriting shenanigans.

     *

     * @param mixed $ret

     *

     * @return mixed it just passes $ret right back

     */

    public static function markEnd($ret = null)

    {

        self::$times[] = (self::$useHrtime ? \hrtime(true) : (\microtime(true) * 1e+6)) - self::$start;

        self::$start = null;

        return $ret;

    }

    /**

     * Ensure that the end of code execution was marked.

     *

     * The end *should* be marked in the instrumented code, but just in case

     * we'll add a fallback here.

     */

    private function ensureEndMarked()

    {

        if (self::$start !== null) {

            self::markEnd();

        }

    }

    /**

     * Instrument code for timeit execution.

     *

     * This inserts `markStart` and `markEnd` calls to ensure that (reasonably)

     * accurate times are recorded for just the code being executed.

     *

     * @param string $code

     */

    private function instrumentCode(string $code): string

    {

        return $this->printer->prettyPrint($this->traverser->traverse($this->parse($code)));

    }

    /**

     * Lex and parse a string of code into statements.

     *

     * @param string $code

     *

     * @return array Statements

     */

    private function parse(string $code): array

    {

        $code = '<?php '.$code;

        try {

            return $this->parser->parse($code);

        } catch (\PhpParser\Error $e) {

            if (\strpos($e->getMessage(), 'unexpected EOF') === false) {

                throw $e;

            }

            // If we got an unexpected EOF, let's try it again with a semicolon.

            return $this->parser->parse($code.';');

        }

    }

}