"""Tests for mpsd-quota command.

We use mocking to just test the functions we have written. The test return
values of the mocked function are taken from actual system calls on the MPSD
HPC system.

The complexity of these functions is not very high; perhaps the testing is not
necessary as such. However, the motivation is to create a framework in which
tests can easily be added if desired.

"""


# import pathlib
import mpsd_hpc_tools.quota as quota


def test_get_ceph_attribute(mocker):
    mock = mocker.patch("subprocess.check_output", return_value=b"25000000000000")
    assert (
        quota.get_ceph_attribute("scratch/MOCK", "ceph.quota.max_bytes")
        == 25000000000000
    )
    mock.assert_called_with(
        [
            "getfattr",
            "-n",
            "ceph.quota.max_bytes",
            "--only-values",
            "--absolute-names",
            "scratch/MOCK",
        ]
    )


def test_df_ceph(mocker):
    # every call of subprocess.check_output returns 2500 bytes:
    mock = mocker.patch(
        "mpsd_hpc_tools.quota.get_ceph_attribute", return_value=10241024
    )

    size, used, avail = quota.df_ceph("/scratch/MOCK")
    assert isinstance(size, int)
    assert isinstance(used, int)
    assert isinstance(avail, int)
    assert used == 10241024
    assert size == 10241024
    assert avail == 0
    assert len(mock.call_args_list) == 2
    assert mock.call_args_list[0].args == ("/scratch/MOCK", "ceph.dir.rbytes")
    assert mock.call_args_list[1].args == ("/scratch/MOCK", "ceph.quota.max_bytes")


def test_df_mountpoint(mocker):
    mock = mocker.patch(
        "subprocess.check_output",
        return_value="Filesystem     1B-blocks      Used    Available Use% Mounted on\nsomedev     1000 500 500   1% /home/glawe\n".encode()
    )
    size, used, avail = quota.df_mountpoint("/home/MOCK")
    assert isinstance(size, int)
    assert isinstance(used, int)
    assert isinstance(avail, int)
    assert size == 1000
    assert used == 500
    assert avail == 500
    assert len(mock.call_args_list) == 1
    # assert mock.call_args_list[0].args == ("--block-size=1", "/home/MOCK")


# def test_compose_quota_report(mocker):
#     #
#     # 1. human readable units (bytes=False)
#     #
#     mocker.patch(
#         "mpsd_hpc_tools.quota.home_bytes_used_quota",
#         return_value=(1_000_000, 5_000_000_000),
#     )
#     mocker.patch(
#         "mpsd_hpc_tools.quota.scratch_bytes_used_quota",
#         return_value=(3_000, 25_000_000_000_000),
#     )
#     output = quota.compose_quota_report(
#         homedir="/home/username",
#         bytes=False,
#         scratchdir=pathlib.Path("/scratch/username"),
#     )
#     output_lines = output.splitlines()
#
#     # Expect output like this:
#     """
#     location                       used          avail            use%
#     /home/username              1.00 MB        5.00 GB           0.02%
#     /scratch/username           3.00 KB       25.00 TB        1.2e-08%
#     """
#     print(output)  # for debugging of test
#
#     assert "1.00 MB" in output_lines[1]
#     assert "/home/username" in output_lines[1]
#     assert "5.00 GB" in output_lines[1]
#     assert "/scratch/username" in output_lines[2]
#     assert "25.00 TB" in output_lines[2]
#     assert "3.00 KB" in output_lines[2]
#     # in total, we expect three lines
#     assert len(output_lines) == 3
#
#     #
#     # 2. human readable units (bytes=False)
#     #
#     output = quota.compose_quota_report(
#         homedir=pathlib.Path("/home/username"),
#         bytes=True,
#         scratchdir="/scratch/username",
#     )
#     output_lines = output.splitlines()
#     # Expect output like this:
#     """
#     location                       used          avail            use%
#     /home/username              1000000     5000000000           0.02%
#     /scratch/username              3000 25000000000000        1.2e-08%
#     """
#
#     print(output)  # for debugging of test
#     assert "1000000" in output_lines[1]
#     assert "/home/username" in output_lines[1]
#     assert "5000000000" in output_lines[1]
#     assert "0.02%" in output_lines[1]
#     assert "/scratch/username" in output_lines[2]
#     assert "25000000000000" in output_lines[2]
#     assert "3000" in output_lines[2]
#     assert "1.2e-08%" in output_lines[2]
#     # in total, we expect three lines
#     assert len(output_lines) == 3
#
#
# def test_compose_quota_report_zero_avail(mocker):
#     """Want to test if division by zero occurs if 0 bytes are available.
#
#     Was a problem in an earlier version
#     (see https://gitlab.gwdg.de/mpsd-cs/mpsd-hpc-tools/-/issues/7)
#     """
#
#     mocker.patch(
#         "mpsd_hpc_tools.quota.home_bytes_used_quota",
#         return_value=(5_000_000_000, 0),
#     )
#     mocker.patch(
#         "mpsd_hpc_tools.quota.scratch_bytes_used_quota",
#         return_value=(25_000_000_000_000, 0),
#     )
#     output = quota.compose_quota_report(
#         homedir="/home/username",
#         bytes=False,
#         scratchdir=pathlib.Path("/scratch/username"),
#     )
#     print("\n" + output)  # debug
#     output_lines = output.splitlines()
#
#     # Expect output like this:
#     """
#     location                       used          avail            use%
#     /home/username              5.00 GB         0.00 B          100.0%
#     /scratch/username          25.00 TB         0.00 B          100.0%
#     """
#
#     assert "0.00 B" in output_lines[1]
#     assert "5.00 GB" in output_lines[1]
#     assert "100.0%" in output_lines[1]
#     assert "/scratch/username" in output_lines[2]
#     assert "0.00 B" in output_lines[2]
#     assert "25.00 TB" in output_lines[2]
#     assert "100.0%" in output_lines[2]


def test_mpsd_quota_command_help(capsys):
    try:
        quota.main(["mpsd-quota", "--help"])
    except SystemExit:
        pass
    output = capsys.readouterr().out
    print(f"{output=}")
    assert "Shows current usage of /home and /scratch" in output
    assert "Output of mpsd-quota is in" in output