import logging

from dvc.cli import parse_args
from dvc.command.params import CmdParamsDiff, _show_diff


def test_params_diff(dvc, mocker):
    cli_args = parse_args(
        ["params", "diff", "HEAD~10", "HEAD~1", "--all", "--show-json"]
    )
    assert cli_args.func == CmdParamsDiff

    cmd = cli_args.func(cli_args)
    m = mocker.patch("dvc.repo.params.diff.diff", return_value={})

    assert cmd.run() == 0

    m.assert_called_once_with(
        cmd.repo, a_rev="HEAD~10", b_rev="HEAD~1", all=True,
    )


def test_params_diff_changed():
    assert _show_diff({"params.yaml": {"a.b.c": {"old": 1, "new": 2}}}) == (
        "   Path       Param   Old   New\n" "params.yaml   a.b.c   1     2  "
    )


def test_params_diff_list():
    assert _show_diff(
        {"params.yaml": {"a.b.c": {"old": 1, "new": [2, 3]}}}
    ) == (
        "   Path       Param   Old    New  \n"
        "params.yaml   a.b.c   1     [2, 3]"
    )


def test_params_diff_unchanged():
    assert _show_diff(
        {"params.yaml": {"a.b.d": {"old": "old", "new": "new"}}}
    ) == (
        "   Path       Param   Old   New\n" "params.yaml   a.b.d   old   new"
    )


def test_params_diff_no_changes():
    assert _show_diff({}) == ""


def test_params_diff_new():
    assert _show_diff(
        {"params.yaml": {"a.b.d": {"old": None, "new": "new"}}}
    ) == (
        "   Path       Param   Old    New\n" "params.yaml   a.b.d   None   new"
    )


def test_params_diff_deleted():
    assert _show_diff(
        {"params.yaml": {"a.b.d": {"old": "old", "new": None}}}
    ) == (
        "   Path       Param   Old   New \n" "params.yaml   a.b.d   old   None"
    )


def test_params_diff_prec():
    assert _show_diff(
        {"params.yaml": {"train.lr": {"old": 0.0042, "new": 0.0043}}}
    ) == (
        "   Path        Param      Old      New  \n"
        "params.yaml   train.lr   0.0042   0.0043"
    )


def test_params_diff_show_json(dvc, mocker, caplog):
    cli_args = parse_args(
        ["params", "diff", "HEAD~10", "HEAD~1", "--show-json"]
    )
    cmd = cli_args.func(cli_args)
    mocker.patch(
        "dvc.repo.params.diff.diff", return_value={"params.yaml": {"a": "b"}}
    )
    with caplog.at_level(logging.INFO, logger="dvc"):
        assert cmd.run() == 0
        assert '{"params.yaml": {"a": "b"}}\n' in caplog.text


def test_params_diff_sorted():
    assert _show_diff(
        {
            "params.yaml": {
                "x.b": {"old": 5, "new": 6},
                "a.d.e": {"old": 3, "new": 4},
                "a.b.c": {"old": 1, "new": 2},
            }
        }
    ) == (
        "   Path       Param   Old   New\n"
        "params.yaml   a.b.c   1     2  \n"
        "params.yaml   a.d.e   3     4  \n"
        "params.yaml   x.b     5     6  "
    )