import pytest
import sys
import os
import subprocess
from .util import get_data, get_main_output
import tempfile
import shutil
from psutil.tests import TRAVIS

LINUX = sys.platform in ('linux', 'linux2')


#@pytest.mark.skipif(not LINUX, reason="LINUX only")
@pytest.mark.skip("Udocker install is broken, see https://github.com/indigo-dc/udocker/issues/221")
class TestUdocker:
    udocker_path = None

    @classmethod
    def setup_class(cls):
        test_cwd = os.getcwd()
        test_environ = os.environ.copy()
        cls.docker_install_dir = tempfile.mkdtemp()
        os.chdir(cls.docker_install_dir)

        url="https://download.ncg.ingrid.pt/webdav/udocker/udocker-1.1.3.tar.gz"
        install_cmds = [
            ["curl", url, "-o", "./udocker-tarball.tgz"],
            ["tar", "xzvf", "udocker-tarball.tgz", "udocker"],
            ["bash", "-c", "UDOCKER_TARBALL={}/udocker-tarball.tgz ./udocker install".format(cls.docker_install_dir)]]

        os.environ['UDOCKER_DIR'] = os.path.join(cls.docker_install_dir, ".udocker")
        os.environ['HOME'] = cls.docker_install_dir

        results = []
        for _ in range(3):
              results = [subprocess.call(cmds) for cmds in install_cmds]
              if sum(results) == 0:
                  break
              subprocess.call(["rm", "./udocker"])

        assert sum(results) == 0

        cls.udocker_path = os.path.join(cls.docker_install_dir, 'udocker')
        os.chdir(test_cwd)
        os.environ = test_environ
        print('Udocker install dir: ' + cls.docker_install_dir)

    @classmethod
    def teardown_class(cls):
        shutil.rmtree(cls.docker_install_dir)

    def test_udocker_usage_should_not_write_cid_file(self, tmpdir):
        cwd = tmpdir.chdir()

        test_file = "tests/wf/wc-tool.cwl"
        job_file = "tests/wf/wc-job.json"
        error_code, stdout, stderr = get_main_output(
            ["--debug", "--default-container", "debian", "--user-space-docker-cmd=" + self.udocker_path,
             get_data(test_file), get_data(job_file)])
        cwd.chdir()
        cidfiles_count = sum(1 for _ in tmpdir.visit(fil="*.cid"))

        tmpdir.remove(ignore_errors=True)

        assert "completed success" in stderr, stderr
        assert cidfiles_count == 0

    @pytest.mark.skipif(TRAVIS, reason='Not reliable on single threaded test on travis.')
    def test_udocker_should_display_memory_usage(self, tmpdir):
        cwd = tmpdir.chdir()
        error_code, stdout, stderr = get_main_output(
            ["--enable-ext", "--default-container=debian",  "--user-space-docker-cmd=" + self.udocker_path,
             get_data("tests/wf/timelimit.cwl"), "--sleep_time", "10"])
        cwd.chdir()
        tmpdir.remove(ignore_errors=True)

        assert "completed success" in stderr, stderr
        assert "Max memory" in stderr, stderr