class ProcessOutputCallbackTest

class ProcessOutputCallbackTest extends UnitTestCase {
    
    /**
     * Tests what happens when the output buffer has invalid JSON.
     */
    public function testInvalidJson() : void {
        $callback = new ProcessOutputCallback();
        $callback(OutputTypeEnum::OUT, '{A string of invalid JSON! 😈');
        $this->expectException(\JsonException::class);
        $this->expectExceptionMessage('Syntax error');
        $callback->parseJsonOutput();
    }
    
    /**
     * Tests what happens when there is error output only.
     */
    public function testErrorOutputOnly() : void {
        $callback = new ProcessOutputCallback();
        $logger = new TestLogger();
        $callback->setLogger($logger);
        $error_text = 'What happened?';
        $callback(OutputTypeEnum::ERR, $error_text);
        $this->assertSame([
            $error_text,
        ], $callback->getErrorOutput());
        // The error should not yet be logged.
        $this->assertEmpty($logger->records);
        // There should be no output data, but calling getOutput() should log the
        // error.
        $this->assertSame([], $callback->getOutput());
        $this->assertNull($callback->parseJsonOutput());
        $this->assertTrue($logger->hasWarning($error_text));
        // Resetting the callback should clear the error buffer but the log should
        // still have the error from before.
        $callback->reset();
        $this->assertTrue($logger->hasWarning($error_text));
    }
    
    /**
     * Tests the full lifecycle of a ProcessOutputCallback object.
     */
    public function testCallback() : void {
        $callback = new ProcessOutputCallback();
        $logger = new TestLogger();
        $callback->setLogger($logger);
        // The buffers should initially be empty, and nothing should be logged.
        $this->assertSame([], $callback->getOutput());
        $this->assertSame([], $callback->getErrorOutput());
        $this->assertNull($callback->parseJsonOutput());
        $this->assertEmpty($logger->records);
        // Send valid JSON data to the callback, one line at a time.
        $data = [
            'value' => 'I have value!',
            'another value' => 'I have another value!',
            'one' => 1,
        ];
        $json = json_encode($data, JSON_PRETTY_PRINT);
        // Ensure the JSON is a multi-line string.
        $this->assertGreaterThan(1, substr_count($json, "\n"));
        $expected_output = [];
        foreach (explode("\n", $json) as $line) {
            $callback(OutputTypeEnum::OUT, "{$line}\n");
            $expected_output[] = "{$line}\n";
        }
        $this->assertSame($expected_output, $callback->getOutput());
        // Ensure that parseJsonOutput() can parse the data without errors.
        $this->assertSame($data, $callback->parseJsonOutput());
        $this->assertSame([], $callback->getErrorOutput());
        $this->assertEmpty($logger->records);
        // If we send error output, it should be logged, but we should still be able
        // to get the data we already sent.
        $callback(OutputTypeEnum::ERR, 'Oh no, what happened?');
        $callback(OutputTypeEnum::ERR, 'Really what happened?!');
        $this->assertSame($data, $callback->parseJsonOutput());
        $expected_error = [
            'Oh no, what happened?',
            'Really what happened?!',
        ];
        $this->assertSame($expected_error, $callback->getErrorOutput());
        $this->assertTrue($logger->hasWarning('Oh no, what happened?Really what happened?!'));
        // Send more output and error data to the callback; they should be appended
        // to the data we previously sent.
        $callback(OutputTypeEnum::OUT, '{}');
        $expected_output[] = '{}';
        $callback(OutputTypeEnum::ERR, 'new Error 1!');
        $callback(OutputTypeEnum::ERR, 'new Error 2!');
        $expected_error[] = 'new Error 1!';
        $expected_error[] = 'new Error 2!';
        // The output buffer will no longer be valid JSON, so don't try to parse it.
        $this->assertSame($expected_output, $callback->getOutput());
        $this->assertSame($expected_error, $callback->getErrorOutput());
        $this->assertTrue($logger->hasWarning(implode('', $expected_error)));
        // The previously logged error output should still be there.
        $this->assertTrue($logger->hasWarning('Oh no, what happened?Really what happened?!'));
        // Clear all stored output and errors.
        $callback->reset();
        $this->assertSame([], $callback->getOutput());
        $this->assertSame([], $callback->getErrorOutput());
        $this->assertNull($callback->parseJsonOutput());
        // Send more output and error data.
        $callback(OutputTypeEnum::OUT, 'Bonjour!');
        $callback(OutputTypeEnum::ERR, 'You continue to annoy me.');
        // We should now only see the stuff we just sent...
        $this->assertSame([
            'Bonjour!',
        ], $callback->getOutput());
        $this->assertSame([
            'You continue to annoy me.',
        ], $callback->getErrorOutput());
        $this->assertTrue($logger->hasWarning('You continue to annoy me.'));
        // ...but the previously logged errors should still be there.
        $this->assertTrue($logger->hasWarning('Oh no, what happened?Really what happened?!new Error 1!new Error 2!'));
        $this->assertTrue($logger->hasWarning('Oh no, what happened?Really what happened?!'));
    }

}