<?php

namespace React\Tests\EventLoop;

use React\EventLoop\ExtEventLoop;

class ExtEventLoopTest extends AbstractLoopTest
{
    /** @var ?string */
    private $fifoPath;

    public function createLoop($readStreamCompatible = false)
    {
        if ('Linux' === PHP_OS && !extension_loaded('posix')) {
            $this->markTestSkipped('libevent tests skipped on linux due to linux epoll issues.');
        }

        if (!extension_loaded('event')) {
            $this->markTestSkipped('ext-event tests skipped because ext-event is not installed.');
        }

        return new ExtEventLoop();
    }

    /**
     * @after
     */
    public function tearDownFile()
    {
        if ($this->fifoPath !== null && file_exists($this->fifoPath)) {
            unlink($this->fifoPath);
        }
    }

    public function createStream()
    {
        // Use a FIFO on linux to get around lack of support for disk-based file
        // descriptors when using the EPOLL back-end.
        if ('Linux' === PHP_OS) {
            $this->fifoPath = tempnam(sys_get_temp_dir(), 'react-');
            assert(is_string($this->fifoPath));

            unlink($this->fifoPath);

            posix_mkfifo($this->fifoPath, 0600);

            $stream = fopen($this->fifoPath, 'r+');

        // ext-event (as of 1.8.1) does not yet support in-memory temporary
        // streams. Setting maxmemory:0 and performing a write forces PHP to
        // back this temporary stream with a real file.
        //
        // This problem is mentioned at https://bugs.php.net/bug.php?id=64652&edit=3
        // but remains unresolved (despite that issue being closed).
        } else {
            $stream = fopen('php://temp/maxmemory:0', 'r+');

            fwrite($stream, 'x');
            ftruncate($stream, 0);
        }

        return $stream;
    }

    public function writeToStream($stream, $content)
    {
        if ('Linux' !== PHP_OS) {
            return parent::writeToStream($stream, $content);
        }

        fwrite($stream, $content);
    }

    /**
     * @group epoll-readable-error
     */
    public function testCanUseReadableStreamWithFeatureFds()
    {
        if (PHP_VERSION_ID > 70000) {
            $this->markTestSkipped('Memory stream not supported');
        }

        $this->loop = $this->createLoop(true);

        $input = fopen('php://temp/maxmemory:0', 'r+');

        fwrite($input, 'x');
        ftruncate($input, 0);

        $this->loop->addReadStream($input, $this->expectCallableExactly(2));

        fwrite($input, "foo\n");
        $this->tickLoop($this->loop);

        fwrite($input, "bar\n");
        $this->tickLoop($this->loop);
    }
}
