# Copyright 2012-2022 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

import subprocess
import tempfile

from portage import os
from portage.tests import TestCase
from portage.util._async.PipeLogger import PipeLogger
from portage.util._async.PopenProcess import PopenProcess
from portage.util._eventloop.global_event_loop import global_event_loop
from _emerge.PipeReader import PipeReader


class PopenPipeTestCase(TestCase):
    """
    Test PopenProcess, which is historically useful for Jython support,
    since it uses the subprocess.Popen instead of os.fork().

    Portage does not currently support Jython, but re-introducing support
    in The Future (TM) may be possible.
    """

    _echo_cmd = "echo -n '%s'"

    def _testPipeReader(self, test_string):
        """
        Use a poll loop to read data from a pipe and assert that
        the data written to the pipe is identical to the data
        read from the pipe.
        """

        producer = PopenProcess(
            proc=subprocess.Popen(
                ["bash", "-c", self._echo_cmd % test_string],
                stdout=subprocess.PIPE,
                stderr=subprocess.STDOUT,
            ),
            pipe_reader=PipeReader(),
            scheduler=global_event_loop(),
        )

        consumer = producer.pipe_reader
        consumer.input_files = {"producer": producer.proc.stdout}

        producer.start()
        producer.wait()

        self.assertEqual(producer.returncode, os.EX_OK)
        self.assertEqual(consumer.returncode, os.EX_OK)

        return consumer.getvalue().decode("ascii", "replace")

    def _testPipeLogger(self, test_string):
        producer = PopenProcess(
            proc=subprocess.Popen(
                ["bash", "-c", self._echo_cmd % test_string],
                stdout=subprocess.PIPE,
                stderr=subprocess.STDOUT,
            ),
            scheduler=global_event_loop(),
        )

        fd, log_file_path = tempfile.mkstemp()
        try:
            consumer = PipeLogger(
                background=True,
                input_fd=producer.proc.stdout,
                log_file_path=log_file_path,
            )

            producer.pipe_reader = consumer

            producer.start()
            producer.wait()

            self.assertEqual(producer.returncode, os.EX_OK)
            self.assertEqual(consumer.returncode, os.EX_OK)

            with open(log_file_path, "rb") as f:
                content = f.read()

        finally:
            os.close(fd)
            os.unlink(log_file_path)

        return content.decode("ascii", "replace")

    def testPopenPipe(self):
        for x in (1, 2, 5, 6, 7, 8, 2**5, 2**10, 2**12, 2**13, 2**14):
            test_string = x * "a"
            output = self._testPipeReader(test_string)
            self.assertEqual(
                test_string, output, f"x = {x}, len(output) = {len(output)}"
            )

            output = self._testPipeLogger(test_string)
            self.assertEqual(
                test_string, output, f"x = {x}, len(output) = {len(output)}"
            )
