"""Tests the json history backend."""

# pylint: disable=protected-access

import shlex

import pytest

from xonsh.history.json import (
    JsonHistory,
    _xhj_gc_bytes_to_rmfiles,
    _xhj_gc_commands_to_rmfiles,
    _xhj_gc_files_to_rmfiles,
    _xhj_gc_seconds_to_rmfiles,
)
from xonsh.history.main import HistoryAlias, history_main
from xonsh.lib.lazyjson import LazyJSON

CMDS = ["ls", "cat hello kitty", "abc", "def", "touch me", "grep from me"]
IGNORE_OPTS = ",".join(["ignoredups", "ignoreerr", "ignorespace"])


@pytest.fixture
def hist(tmpdir, xession, monkeypatch):
    file = tmpdir / "xonsh-HISTORY-TEST.json"
    h = JsonHistory(filename=str(file), here="yup", sessionid="SESSIONID", gc=False)
    monkeypatch.setattr(xession, "history", h)
    yield h


def test_hist_init(hist, xession):
    """Test initialization of the shell history."""
    with LazyJSON(hist.filename) as lj:
        obs = lj["here"]
    assert "yup" == obs


def test_hist_append(hist, xession):
    """Verify appending to the history works."""
    xession.env["HISTCONTROL"] = set()
    hf = hist.append({"inp": "still alive", "rtn": 0})
    assert hf is None
    assert "still alive" == hist.buffer[0]["inp"]
    assert 0 == hist.buffer[0]["rtn"]
    assert 0 == hist.rtns[-1]
    hf = hist.append({"inp": "dead now", "rtn": 1})
    assert "dead now" == hist.buffer[1]["inp"]
    assert 1 == hist.buffer[1]["rtn"]
    assert 1 == hist.rtns[-1]
    hf = hist.append({"inp": "reborn", "rtn": 0})
    assert "reborn" == hist.buffer[2]["inp"]
    assert 0 == hist.buffer[2]["rtn"]
    assert 0 == hist.rtns[-1]


def test_hist_flush(hist, xession):
    """Verify explicit flushing of the history works."""
    hf = hist.flush()
    assert hf is None
    xession.env["HISTCONTROL"] = set()
    hist.append({"inp": "still alive?", "rtn": 0, "out": "yes"})
    hf = hist.flush()
    assert hf is not None
    while hf.is_alive():
        pass
    with LazyJSON(hist.filename) as lj:
        assert len(lj["cmds"]) == 1
        cmd = lj["cmds"][0]
        assert cmd["inp"] == "still alive?"
        assert not cmd.get("out", None)


def test_hist_flush_on_xonsh_unload(hist, xession):
    hf = hist.flush()
    assert hf is None
    xession.env["HISTCONTROL"] = set()
    hist.append({"inp": "save me if you unload", "rtn": 0, "out": "yes"})
    xession.unload()
    with LazyJSON(hist.filename) as lj:
        assert len(lj["cmds"]) == 1
        cmd = lj["cmds"][0]
        assert cmd["inp"] == "save me if you unload"


def test_hist_flush_with_store_stdout(hist, xession):
    """Verify explicit flushing of the history works."""
    hf = hist.flush()
    assert hf is None
    xession.env["HISTCONTROL"] = set()
    xession.env["XONSH_STORE_STDOUT"] = True
    hist.append({"inp": "still alive?", "rtn": 0, "out": "yes"})
    hf = hist.flush()
    assert hf is not None
    while hf.is_alive():
        pass
    with LazyJSON(hist.filename) as lj:
        assert len(lj["cmds"]) == 1
        assert lj["cmds"][0]["inp"] == "still alive?"
        assert lj["cmds"][0]["out"].strip() == "yes"


def test_hist_flush_with_store_cwd(hist, xession):
    hf = hist.flush()
    assert hf is None

    hist.save_cwd = True
    hist.append({"inp": "# saving with cwd", "rtn": 0, "out": "yes", "cwd": "/tmp"})
    hf = hist.flush()
    assert hf is not None

    hist.save_cwd = False
    hist.append({"inp": "# saving without cwd", "rtn": 0, "out": "yes", "cwd": "/tmp"})
    hf = hist.flush()
    assert hf is not None

    while hf.is_alive():
        pass
    with LazyJSON(hist.filename) as lj:
        assert len(lj["cmds"]) == 2
        assert lj["cmds"][0]["cwd"] == "/tmp"
        assert "cwd" not in lj["cmds"][1]


def test_hist_flush_with_hist_control(hist, xession):
    """Verify explicit flushing of the history works."""
    hf = hist.flush()
    assert hf is None
    xession.env["HISTCONTROL"] = IGNORE_OPTS
    hist.append({"inp": "ls foo1", "rtn": 0})
    hist.append({"inp": "ls foo1", "rtn": 1})
    hist.append({"inp": "ls foo1", "rtn": 0})
    hist.append({"inp": "ls foo2", "rtn": 2})
    hist.append({"inp": "ls foo3", "rtn": 0})
    hist.append({"inp": "ls secret", "rtn": 0, "spc": True})
    hf = hist.flush()
    assert hf is not None
    while hf.is_alive():
        pass
    assert len(hist.buffer) == 0
    with LazyJSON(hist.filename) as lj:
        cmds = list(lj["cmds"])
        assert len(cmds) == 2
        assert [x["inp"] for x in cmds] == ["ls foo1", "ls foo3"]
        assert [x["rtn"] for x in cmds] == [0, 0]


def test_cmd_field(hist, xession):
    # in-memory
    xession.env["HISTCONTROL"] = set()
    hf = hist.append({"inp": "ls foo", "rtn": 1})
    assert hf is None
    assert 1 == hist.rtns[0]
    assert 1 == hist.rtns[-1]
    assert hist.outs[-1] is None
    # slice
    assert [1] == hist.rtns[:]
    # on disk
    hf = hist.flush()
    assert hf is not None
    assert 1 == hist.rtns[0]
    assert 1 == hist.rtns[-1]
    assert hist.outs[-1] is None


@pytest.mark.parametrize(
    "inp, commands, offset",
    [
        ("", CMDS, (0, 1)),
        ("-r", list(reversed(CMDS)), (len(CMDS) - 1, -1)),
        ("0", CMDS[0:1], (0, 1)),
        ("1", CMDS[1:2], (1, 1)),
        ("-2", CMDS[-2:-1], (len(CMDS) - 2, 1)),
        ("1:3", CMDS[1:3], (1, 1)),
        ("1::2", CMDS[1::2], (1, 2)),
        ("-4:-2", CMDS[-4:-2], (len(CMDS) - 4, 1)),
    ],
)
def test_show_cmd_numerate(inp, commands, offset, hist, xession, capsys):
    """Verify that CLI history commands work."""
    base_idx, step = offset
    xession.env["HISTCONTROL"] = set()
    for ts, cmd in enumerate(CMDS):  # populate the shell history
        hist.append({"inp": cmd, "rtn": 0, "ts": (ts + 1, ts + 1.5)})

    exp = (f"{base_idx + idx * step}: {cmd}" for idx, cmd in enumerate(list(commands)))
    exp = "\n".join(exp)

    history_main(["show", "-n"] + shlex.split(inp))
    out, err = capsys.readouterr()
    assert out.rstrip() == exp


def test_history_diff(tmpdir, xession, monkeypatch, capsys):
    files = [tmpdir / f"xonsh-HISTORY-TEST-{idx}.json" for idx in range(2)]
    for file in files:
        hist = JsonHistory(
            filename=str(file), here="yup", sessionid="SESSIONID", gc=False
        )
        monkeypatch.setattr(xession, "history", hist)
        xession.env["HISTCONTROL"] = set()
        for ts, cmd in enumerate(CMDS):  # populate the shell history
            hist.append({"inp": cmd, "rtn": 0, "ts": (ts + 1, ts + 1.5)})
        flush = hist.flush()
        if flush.queue:
            # make sure that flush is complete
            time.sleep(0.1)

    left, right = (str(f) for f in files)
    history_main(["diff", left, right])
    out, err = capsys.readouterr()
    # make sure it is called
    assert out.rstrip()


def test_histcontrol(hist, xession):
    """Test HISTCONTROL=ignoredups,ignoreerr,ignorespacee"""

    xession.env["HISTCONTROL"] = IGNORE_OPTS
    assert len(hist.buffer) == 0

    # An error, buffer remains empty
    hist.append({"inp": "ls foo", "rtn": 2})
    assert len(hist.buffer) == 1
    assert hist.rtns[-1] == 2
    assert hist.inps[-1] == "ls foo"

    # Success
    hist.append({"inp": "ls foobazz", "rtn": 0})
    assert len(hist.buffer) == 2
    assert "ls foobazz" == hist.buffer[-1]["inp"]
    assert 0 == hist.buffer[-1]["rtn"]
    assert hist.rtns[-1] == 0
    assert hist.inps[-1] == "ls foobazz"

    # Error
    hist.append({"inp": "ls foo", "rtn": 2})
    assert len(hist.buffer) == 3
    assert "ls foo" == hist.buffer[-1]["inp"]
    assert 2 == hist.buffer[-1]["rtn"]
    assert hist.rtns[-1] == 2
    assert hist.inps[-1] == "ls foo"

    # File now exists, success
    hist.append({"inp": "ls foo", "rtn": 0})
    assert len(hist.buffer) == 4
    assert "ls foo" == hist.buffer[-1]["inp"]
    assert 0 == hist.buffer[-1]["rtn"]
    assert hist.rtns[-1] == 0
    assert hist.inps[-1] == "ls foo"

    # Success
    hist.append({"inp": "ls", "rtn": 0})
    assert len(hist.buffer) == 5
    assert "ls" == hist.buffer[-1]["inp"]
    assert 0 == hist.buffer[-1]["rtn"]
    assert hist.rtns[-1] == 0
    assert hist.inps[-1] == "ls"

    # Dup
    hist.append({"inp": "ls", "rtn": 0})
    assert len(hist.buffer) == 6
    assert hist.rtns[-1] == 0
    assert hist.inps[-1] == "ls"

    # Success
    hist.append({"inp": "/bin/ls", "rtn": 0})
    assert len(hist.buffer) == 7
    assert "/bin/ls" == hist.buffer[-1]["inp"]
    assert 0 == hist.buffer[-1]["rtn"]
    assert hist.rtns[-1] == 0
    assert hist.inps[-1] == "/bin/ls"

    # Error
    hist.append({"inp": "ls bazz", "rtn": 1})
    assert len(hist.buffer) == 8
    assert "ls bazz" == hist.buffer[-1]["inp"]
    assert 1 == hist.buffer[-1]["rtn"]
    assert hist.rtns[-1] == 1
    assert hist.inps[-1] == "ls bazz"

    # Error
    hist.append({"inp": "ls bazz", "rtn": -1})
    assert len(hist.buffer) == 9
    assert "ls bazz" == hist.buffer[-1]["inp"]
    assert -1 == hist.buffer[-1]["rtn"]
    assert hist.rtns[-1] == -1
    assert hist.inps[-1] == "ls bazz"

    # Success
    hist.append({"inp": "echo not secret", "rtn": 0, "spc": False})
    assert len(hist.buffer) == 10
    assert "echo not secret" == hist.buffer[-1]["inp"]
    assert 0 == hist.buffer[-1]["rtn"]
    assert hist.rtns[-1] == 0
    assert hist.inps[-1] == "echo not secret"

    # Space
    hist.append({"inp": "echo secret command", "rtn": 0, "spc": True})
    assert len(hist.buffer) == 10
    assert hist.rtns[-1] == 0
    assert hist.inps[-1] == "echo not secret"


@pytest.mark.parametrize("args", ["-h", "--help", "show -h", "show --help"])
def test_parse_args_help(args, capsys):
    with pytest.raises(SystemExit):
        history_main(shlex.split(args))
    assert "show this help message and exit" in capsys.readouterr()[0]


@pytest.mark.parametrize(
    "args, session, slice, numerate, reverse",
    [
        ("", "session", [], False, False),
        ("1:5", "session", ["1:5"], False, False),
        ("show", "session", [], False, False),
        ("show 15", "session", ["15"], False, False),
        ("show bash 3:5 15:66", "bash", ["3:5", "15:66"], False, False),
        ("show -r", "session", [], False, True),
        ("show -rn bash", "bash", [], True, True),
        ("show -n -r -30:20", "session", ["-30:20"], True, True),
        ("show -n zsh 1:2:3", "zsh", ["1:2:3"], True, False),
    ],
)
def test_parser_show(args, session, slice, numerate, reverse, mocker, hist, xession):
    # use dict instead of argparse.Namespace for pretty pytest diff
    exp_ns = {
        "session": session,
        "slices": slice,
        "numerate": numerate,
        "reverse": reverse,
        "start_time": None,
        "end_time": None,
        "datetime_format": None,
        "timestamp": False,
        "null_byte": False,
    }

    # clear parser instance, so that patched func can take place
    from xonsh.history import main as mod

    main = HistoryAlias()
    spy = mocker.spy(mod.xcli, "run_with_partial_args")

    # action
    main(shlex.split(args))

    # assert
    spy.assert_called_once()

    # assemble
    args, _ = spy.call_args
    _, kwargs = args
    called_with = {attr: kwargs[attr] for attr in exp_ns}
    if kwargs["_unparsed"]:
        called_with["slices"] = kwargs["_unparsed"]

    # assert
    assert called_with == exp_ns


@pytest.mark.parametrize(
    "index, exp",
    [
        (-1, ("grep from me", "out", 0, (5, 6))),
        (1, ("cat hello kitty", "out", 0, (1, 2))),
        (
            slice(1, 3),
            [("cat hello kitty", "out", 0, (1, 2)), ("abc", "out", 0, (2, 3))],
        ),
    ],
)
def test_history_getitem(index, exp, hist, xession):
    xession.env["HISTCONTROL"] = set()
    attrs = ("inp", "out", "rtn", "ts")

    for ts, cmd in enumerate(CMDS):  # populate the shell history
        entry = {
            k: v for k, v in zip(attrs, [cmd, "out", 0, (ts, ts + 1)], strict=False)
        }
        hist.append(entry)

    entry = hist[index]
    if isinstance(entry, list):
        assert [(e.cmd, e.out, e.rtn, e.ts) for e in entry] == exp
    else:
        assert (entry.cmd, entry.out, entry.rtn, entry.ts) == exp


import calendar
import time

HF_FIRST_DAY = calendar.timegm(time.struct_time((2018, 5, 13, 0, 0, 0, 0, 0, 0)))


def history_files_list(gen_count) -> (float, int, str, int):
    """Generate a list of history file tuples"""
    # generate test list:
    # 2 files every day in range
    # morning file has 100 commands, evening 50
    # first file size 10000, 2nd 2500
    # first file time 0900, 2nd 2300
    # for sanity in reproducable test results, all date arithmetic ignores astronomy.
    # time zone is UTC, all days have 24 h and 0 sec, no leap year or leap sec.

    retval = []
    for i in range(int((gen_count + 1) / 2)):
        retval.append(
            (
                # first day in sec + #days * 24hr + #hr * 60min + # sec * 60sec + sec= sec to date.
                HF_FIRST_DAY + (((((i * 24) + 9) * 60) + 0) * 60) + 0,  # mod dt,
                100,
                f".argle/xonsh-{2 * i:05n}.json",
                10000,
            )
        )
        retval.append(
            (
                # first day in sec + #days * 24hr + #hr * 60min + # sec * 60sec + sec= sec to date.
                HF_FIRST_DAY + (((((i * 24) + 23) * 60) + 0) * 60) + 0,  # mod dt,
                50,
                f".argle/xonsh-{2 * i + 1:05n}.json",
                2500,
            )
        )
    return retval


# generate 100 files, 50 days.
HISTORY_FILES_LIST = history_files_list(100)

# TS of newest history file
SEC_FROM_LATEST = time.time() - (HISTORY_FILES_LIST[-1][0])
SEC_PER_DAY = 24 * 60 * 60
# "now" gets evaluated above at test definition time and later when the tests
# are executed.  If the difference between these equals half the smallest time
# interval between log files, the test will fail.  We constructed logs at 9a and
# 11p every day.  The smallest interval is thus ten hours (from 11p to 9a), so
# we can't spend more than five hours executing the tests.
MAX_RUNTIME = 30 * 60
MIN_DIFF = min(
    HISTORY_FILES_LIST[i + 1][0] - HISTORY_FILES_LIST[i][0]
    for i in range(len(HISTORY_FILES_LIST) - 1)
)
assert MAX_RUNTIME < MIN_DIFF / 2


@pytest.mark.parametrize(
    "fn, hsize, in_files, exp_size, exp_files",
    [
        # xhj_gc_commands_to_rmfiles
        (
            _xhj_gc_commands_to_rmfiles,
            1001 * (100 + 50),  # Limit > history, no trimming.
            HISTORY_FILES_LIST,
            0,  # nothing trimmed
            [],  #
        ),
        (
            _xhj_gc_commands_to_rmfiles,
            20 * (100 + 50),  # keep 20 full days (40 files)
            HISTORY_FILES_LIST,
            30 * (100 + 50),
            HISTORY_FILES_LIST[: 2 * (30)],  # trim 30 full days
        ),
        (
            _xhj_gc_commands_to_rmfiles,
            20 * (100 + 50) + 100,  # keep 20 full newest and evening before (41 files)
            HISTORY_FILES_LIST,
            30 * (100 + 50) - 50,  # trim 30 full oldest, keep newest evening (59 files)
            HISTORY_FILES_LIST[: 2 * 30 - 1],
        ),
        # xhj_gc_files_to_rmfiles
        (
            _xhj_gc_files_to_rmfiles,
            1001,  # Limit > history, no trimming.
            HISTORY_FILES_LIST,
            0,  # nothing trimmed
            [],  #
        ),
        (
            _xhj_gc_files_to_rmfiles,
            40,  # keep 20 full days (40 files)
            HISTORY_FILES_LIST,
            60,
            HISTORY_FILES_LIST[:60],  # trim 30 full days
        ),
        (
            _xhj_gc_files_to_rmfiles,
            41,  # keep 20 full newest and evening before (41 files)
            HISTORY_FILES_LIST,
            59,  # trim 30 full oldest, keep newest evening (59 files)
            HISTORY_FILES_LIST[: 2 * 30 - 1],
        ),
        # xhj_gc_bytes_to_rmfiles
        (
            _xhj_gc_bytes_to_rmfiles,
            1001 * (10000 + 2500),  # Limit > history, no trimming.
            HISTORY_FILES_LIST,
            0,  # nothing trimmed
            [],  #
        ),
        (
            _xhj_gc_bytes_to_rmfiles,
            20 * (10000 + 2500),  # keep 20 full days (40 files)
            HISTORY_FILES_LIST,
            30 * (10000 + 2500),
            HISTORY_FILES_LIST[: 2 * (30)],  # trim 30 full days
        ),
        (
            _xhj_gc_bytes_to_rmfiles,
            20 * (10000 + 2500)
            + 10000,  # keep 20 full newest and evening before (41 files)
            HISTORY_FILES_LIST,
            30 * (10000 + 2500)
            - 2500,  # trim 30 full oldest, keep newest evening (59 files)
            HISTORY_FILES_LIST[: 2 * 30 - 1],
        ),
        # xhj_gc_seconds_to_rmfiles
        (
            _xhj_gc_seconds_to_rmfiles,
            SEC_FROM_LATEST + 1001 * SEC_PER_DAY,  # Limit > history, no trimming.
            HISTORY_FILES_LIST,
            0,  # nothing trimmed
            [],  #
        ),
        (
            _xhj_gc_seconds_to_rmfiles,
            SEC_FROM_LATEST + MAX_RUNTIME,  # keep just the latest file (night)
            HISTORY_FILES_LIST,
            HISTORY_FILES_LIST[-1][0] - HISTORY_FILES_LIST[0][0],
            HISTORY_FILES_LIST[:-1],
        ),
        (
            _xhj_gc_seconds_to_rmfiles,
            # keep the latest file and previous day, so we'll get three files
            # including the previous morning and night before
            SEC_FROM_LATEST + SEC_PER_DAY + MAX_RUNTIME,
            HISTORY_FILES_LIST,
            HISTORY_FILES_LIST[-3][0] - HISTORY_FILES_LIST[0][0],
            HISTORY_FILES_LIST[:-3],
        ),
    ],
    # Explicit IDs because three `seconds_to_rmfiles` rows derive hsize from
    # `time.time()` at import — without these IDs the auto-generated test
    # names contain the timestamp and differ between pytest-xdist workers,
    # breaking collection with "Different tests were collected" errors.
    ids=[
        "commands-no-trim",
        "commands-20days",
        "commands-20-plus-evening",
        "files-no-trim",
        "files-20days",
        "files-20-plus-evening",
        "bytes-no-trim",
        "bytes-20days",
        "bytes-20-plus-evening",
        "seconds-no-trim",
        "seconds-latest-only",
        "seconds-latest-plus-day",
    ],
)
def test__xhj_gc_xx_to_rmfiles(fn, hsize, in_files, exp_size, exp_files, xession):
    act_size, act_files = fn(hsize, in_files)

    assert act_files == exp_files

    # comparing age is approximate, because xhj_gc_seconds_to_rmfiles computes 'now' on each call.
    # We find multi-minute variations in CI environments.
    # This should cover some amount of think time sitting at a breakpoint, too.
    if fn == _xhj_gc_seconds_to_rmfiles:
        assert abs(act_size - exp_size) < MAX_RUNTIME
    else:
        assert act_size == exp_size


def test_hist_clear_cmd(hist, xession, capsys, tmpdir):
    """Verify that the CLI history clear command works."""
    xession.env.update({"XONSH_DATA_DIR": str(tmpdir)})
    xession.env["HISTCONTROL"] = set()

    for ts, cmd in enumerate(CMDS):  # populate the shell history
        hist.append({"inp": cmd, "rtn": 0, "ts": (ts + 1, ts + 1.5)})
    assert len(xession.history) == 6

    history_main(["clear"])

    out, err = capsys.readouterr()
    assert err.rstrip() == "History cleared"
    assert len(xession.history) == 0


def test_hist_clear_wipes_file_and_allows_new_commands(hist, xession, tmpdir):
    """After clear, old commands are gone from disk and new ones are saved."""
    xession.env.update({"XONSH_DATA_DIR": str(tmpdir)})
    xession.env["HISTCONTROL"] = set()

    # Add commands
    for ts, cmd in enumerate(CMDS):
        hist.append({"inp": cmd, "rtn": 0, "ts": (ts + 1, ts + 1.5)})
    hist.flush(at_exit=True)
    assert len(hist) == 6

    # Clear
    hist.clear()
    assert len(hist) == 0

    # Verify file on disk has no commands
    from xonsh.lib.lazyjson import LazyJSON

    with LazyJSON(hist.filename) as lj:
        assert len(lj["cmds"]) == 0

    # Add new command after clear
    hist.append({"inp": "echo after", "rtn": 0, "ts": (100, 100.5)})
    hist.flush(at_exit=True)
    assert len(hist) == 1

    with LazyJSON(hist.filename) as lj:
        assert len(lj["cmds"]) == 1
        assert lj["cmds"][0]["inp"] == "echo after"


def test_erasedups_command(hist, xession, tmpdir):
    """Test history erasedups removes duplicates across JSON history."""
    xession.env.update({"XONSH_DATA_DIR": str(tmpdir)})
    xession.env["HISTCONTROL"] = set()

    hist.append({"inp": "ls foo", "rtn": 0, "ts": (1, 2)})
    hist.append({"inp": "ls bar", "rtn": 0, "ts": (3, 4)})
    hist.append({"inp": "ls foo", "rtn": 0, "ts": (5, 6)})
    hist.flush(at_exit=True)

    removed, total = hist.erasedups()
    assert removed == 1
    assert total == 3

    from xonsh.lib.lazyjson import LazyJSON

    with LazyJSON(hist.filename) as lj:
        cmds = list(lj["cmds"])
        inps = [c["inp"] for c in cmds]
        assert len(inps) == 2
        assert "ls bar" in inps
        assert "ls foo" in inps


def test_hist_off_cmd(hist, xession, capsys, tmpdir):
    """Verify that the CLI history off command works."""
    xession.env.update({"XONSH_DATA_DIR": str(tmpdir)})
    xession.env["HISTCONTROL"] = set()

    for ts, cmd in enumerate(CMDS):  # populate the shell history
        hist.append({"inp": cmd, "rtn": 0, "ts": (ts + 1, ts + 1.5)})
    assert len(xession.history) == 6

    history_main(["off"])

    out, err = capsys.readouterr()
    assert err.rstrip() == "History off"
    assert len(xession.history) == 0

    for ts, cmd in enumerate(CMDS):  # attempt to populate the shell history
        hist.append({"inp": cmd, "rtn": 0, "ts": (ts + 1, ts + 1.5)})

    assert len(xession.history) == 0


def test_hist_on_cmd(hist, xession, capsys, tmpdir):
    """Verify that the CLI history on command works."""
    xession.env.update({"XONSH_DATA_DIR": str(tmpdir)})
    xession.env["HISTCONTROL"] = set()

    for ts, cmd in enumerate(CMDS):  # populate the shell history
        hist.append({"inp": cmd, "rtn": 0, "ts": (ts + 1, ts + 1.5)})
    assert len(xession.history) == 6

    history_main(["off"])
    history_main(["on"])

    out, err = capsys.readouterr()
    assert err.rstrip().endswith("History on")
    assert len(xession.history) == 0

    for ts, cmd in enumerate(CMDS):  # populate the shell history
        hist.append({"inp": cmd, "rtn": 0, "ts": (ts + 1, ts + 1.5)})

    assert len(xession.history) == 6


@pytest.mark.parametrize(
    "src_sessionid", [None, "e2265764-041c-4c57-acba-49d4e4f676e5"]
)
def test_hist_pull(src_sessionid, ptk_shell, tmpdir, xonsh_session, monkeypatch):
    """Test that `pull` method correctly loads history entries
    added to the database by other sessions."""
    xonsh_session.env["XONSH_DATA_DIR"] = str(tmpdir)
    before = time.time()

    # simulate commands being run in other sessions before this session starts
    hist_a = JsonHistory(sessionid=src_sessionid, gc=False)
    hist_a.append({"inp": "cmd hist_a before", "rtn": 0, "ts": [before, before]})
    hist_b = JsonHistory(gc=False)
    hist_b.append({"inp": "cmd hist_b before", "rtn": 0, "ts": [before, before]})

    hist_main = JsonHistory(gc=False)

    # simulate commands being run in other sessions after this session starts
    after = time.time() + 1
    hist_a.append({"inp": "cmd hist_a after", "rtn": 0, "ts": [after, after]})
    hist_b.append({"inp": "cmd hist_b after", "rtn": 0, "ts": [after + 1, after + 1]})

    # give the filesystem long enough that it will update the mtime
    time.sleep(0.01)
    # at_exit ensures that we run the flush synchronously instead of in a background thread
    hist_a.flush(at_exit=True)
    hist_b.flush(at_exit=True)

    # pull only works with PTK shell
    monkeypatch.setattr(xonsh_session.shell, "shell", ptk_shell[2])
    hist_main.pull(src_sessionid=src_sessionid)
    hist_strings = ptk_shell[2].prompter.history.get_strings()

    if src_sessionid is None:
        # ensure that only commands from after the pulling session started get pulled in
        # order is ensured because files are ordered by mtime
        assert hist_strings == ["cmd hist_a after", "cmd hist_b after"]
    else:
        # and that the commands are correctly filtered by session id if applicable
        assert hist_strings == ["cmd hist_a after"]


def test_hist_pull_mixed(ptk_shell, tmpdir, xonsh_session, monkeypatch):
    """Test that mixing general pull with session-specific pull
    does not result in missed or duplicate items.
    """
    xonsh_session.env["XONSH_DATA_DIR"] = str(tmpdir)
    monkeypatch.setattr(xonsh_session.shell, "shell", ptk_shell[2])

    # make sure that all of our fake commands have real, sequential timestamps
    def cmd(inp):
        start, end = time.time(), time.time()
        return {"inp": inp, "rtn": 0, "ts": [start, end]}

    hist_a = JsonHistory(gc=False)
    hist_b = JsonHistory(gc=False)
    hist_main = JsonHistory(gc=False)

    # windows time.time() has ~16ms granularity, so we need to give it some time to increment
    time.sleep(0.032)
    hist_a.append(cmd("a1"))
    time.sleep(0.032)
    hist_b.append(cmd("b1"))

    # filesystem mtimes and time.time() don't always match up perfectly,
    # so we need a little bit of fudge time
    time.sleep(0.032)
    hist_a.flush()
    hist_b.flush()
    time.sleep(0.032)
    hist_main.pull(src_sessionid=str(hist_a.sessionid))
    # at this point, hist_main will only have "a1" in its history
    assert ptk_shell[2].prompter.history.get_strings() == ["a1"]

    time.sleep(0.032)
    hist_a.append(cmd("a2"))
    time.sleep(0.032)
    hist_b.append(cmd("b2"))

    time.sleep(0.032)
    hist_a.flush()
    hist_b.flush()
    time.sleep(0.032)
    hist_main.pull()
    # hist_main should now have all the items we just added

    hist_strings = ptk_shell[2].prompter.history.get_strings()
    assert hist_strings == ["a1", "b1", "a2", "b2"]
