# Copyright (c) 2026 Krzysztof Rudnicki. MIT licence.
"""Recovering the command history, without inventing any of it.

Two properties matter more than the rest and each has its own test: the two
sources must not double-count the same invocations, and a second run must
insert nothing.
"""

from __future__ import annotations

from typing import TYPE_CHECKING

from signal_bot.analytics import backfill
from signal_bot.analytics.backfill_join import WINDOW_MS
from signal_bot.analytics.journal import JournalLine
from signal_bot.analytics.uses import SOURCE_DAILY, SOURCE_JOURNAL
from signal_bot.stats.events import MessageEvent

if TYPE_CHECKING:
    from signal_bot.store import Store

GROUP = "group-a=="
DAY = "2026-08-29"
# Midday on the day above, so a +/- window cannot cross a date boundary.
NOON_MS = backfill.midnight_ms(DAY) + 12 * 3600 * 1000


def a_message(store: Store, at_ms: int, who: str = "ala", uuid: str = "u1") -> None:
    """One counted command in the message history."""
    store.events.record(
        MessageEvent(
            group_id=GROUP,
            uuid=uuid,
            display_name=who,
            sent_at_ms=at_ms,
            day=DAY,
            local_hour=12,
            is_command=True,
        )
    )


def a_line(at_ms: int, command: str, who: str = "ala", *, refused: bool = False) -> JournalLine:
    """One line the bot wrote about running a command."""
    return JournalLine(at_ms=at_ms, command=command, display_name=who, refused=refused)


def rows(store: Store) -> list[tuple[str, str, int, str]]:
    """Every recorded attempt as (command, outcome, hour, source)."""
    return [
        (str(r["command"]), str(r["outcome"]), int(r["local_hour"]), str(r["source"]))
        for r in store.commands.connection.execute(
            "SELECT command, outcome, local_hour, source FROM command_events ORDER BY invoked_at_ms"
        )
    ]


def test_a_message_gets_its_name_from_the_journal(store: Store) -> None:
    """The whole point: the database has the hour, the journal has the name."""
    a_message(store, NOON_MS)
    report, events = backfill.plan(store, [a_line(NOON_MS + 200, "cat")])
    backfill.apply(store, events)

    assert report.journal_rows == 1
    assert rows(store) == [("cat", "ok", 12, SOURCE_JOURNAL)]


def test_a_journal_line_earlier_than_its_message_still_matches(store: Store) -> None:
    """The window is symmetric, and this is why.

    sent_at_ms comes from the sender's phone and the journal stamp from this
    host; nothing keeps two clocks in step. On the live database 194 of 299
    counted commands had a journal line *earlier* than their own timestamp.
    An asymmetric window drops every one of them.
    """
    a_message(store, NOON_MS)
    _report, events = backfill.plan(store, [a_line(NOON_MS - 3_000, "cat")])
    backfill.apply(store, events)
    assert rows(store) == [("cat", "ok", 12, SOURCE_JOURNAL)]


def test_a_line_outside_the_window_is_not_used(store: Store) -> None:
    """Far enough away it is somebody else's invocation, or another day's."""
    a_message(store, NOON_MS)
    report, events = backfill.plan(store, [a_line(NOON_MS + WINDOW_MS + 1, "cat")])
    backfill.apply(store, events)
    assert report.journal_rows == 0
    assert report.unmatched == 1
    assert [row for row in rows(store) if row[3] == SOURCE_JOURNAL] == []


def test_two_commands_seconds_apart_are_both_resolved(store: Store) -> None:
    """Global closest-pair assignment, not best-for-each-row in turn.

    Both lines sit inside both messages' windows. Per-row greedy cannot tell
    them apart and drops both; assignment pairs them by distance, which is
    correct because the clock skew is the same for both.
    """
    a_message(store, NOON_MS)
    a_message(store, NOON_MS + 5_000)
    report, events = backfill.plan(
        store,
        [a_line(NOON_MS + 200, "cat"), a_line(NOON_MS + 5_200, "dog")],
    )
    backfill.apply(store, events)

    assert report.ambiguous == 0
    assert [(row[0], row[3]) for row in rows(store)] == [
        ("cat", SOURCE_JOURNAL),
        ("dog", SOURCE_JOURNAL),
    ]


def test_a_message_with_no_line_left_for_it_is_dropped(store: Store) -> None:
    """Two messages, one line: the second is a gap, never a guess."""
    a_message(store, NOON_MS)
    a_message(store, NOON_MS + 1_000)
    report, events = backfill.plan(store, [a_line(NOON_MS + 100, "cat")])
    backfill.apply(store, events)

    assert report.journal_rows == 1
    assert report.ambiguous == 1


def test_a_cooldown_refusal_is_recovered_as_a_refusal(store: Store) -> None:
    """The one gate that already logged. daily_limit and vote_gated did not."""
    a_message(store, NOON_MS)
    _report, events = backfill.plan(store, [a_line(NOON_MS, "cat", refused=True)])
    backfill.apply(store, events)
    assert rows(store) == [("cat", "refused_cooldown", 12, SOURCE_JOURNAL)]


def test_the_two_sources_do_not_double_count(store: Store) -> None:
    """The failure that would look exactly like data.

    daily_uses says three uses. The journal explains one of them exactly.
    The residual must be two, not three -- otherwise every historical count
    is inflated and nothing anywhere fails.
    """
    a_message(store, NOON_MS)
    for _ in range(3):
        store.record_use(GROUP, "u1", "cat", 1.0, DAY)

    report, events = backfill.plan(store, [a_line(NOON_MS + 100, "cat")])
    backfill.apply(store, events)

    assert report.journal_rows == 1
    assert report.daily_rows == 2
    assert len(rows(store)) == 3


def test_a_day_the_message_history_never_saw_arrives_whole(store: Store) -> None:
    """The real shape of 2026-08-29: counts, and no message_events at all.

    Those rows carry UNKNOWN_HOUR, so every hour-of-day panel must exclude
    them rather than file them under midnight.
    """
    for _ in range(4):
        store.record_use(GROUP, "u1", "pope", 1.0, DAY)

    report, events = backfill.plan(store, [])
    backfill.apply(store, events)

    assert report.journal_rows == 0
    assert report.daily_rows == 4
    assert {row[2] for row in rows(store)} == {-1}
    assert {row[3] for row in rows(store)} == {SOURCE_DAILY}


def test_running_it_twice_inserts_nothing_the_second_time(store: Store) -> None:
    """Idempotency, and it must come from the key rather than from a wipe.

    journald has no retention configuration and will rotate. A
    clear-then-reimport pass would delete rows it could no longer replace,
    so a second run has to be harmless without one.
    """
    a_message(store, NOON_MS)
    store.record_use(GROUP, "u1", "cat", 1.0, DAY)
    lines = [a_line(NOON_MS + 100, "cat")]

    _first, events = backfill.plan(store, lines)
    backfill.apply(store, events)
    before = rows(store)

    for candidate in lines:
        assert candidate is not None
    _second, again = backfill.plan(store, [a_line(NOON_MS + 100, "cat")])
    backfill.apply(store, again)

    assert rows(store) == before


def test_live_rows_are_never_re_imported(store: Store) -> None:
    """The cutoff. A live row already describes that invocation exactly.

    Without it, a pass run after recording started would import the journal
    line for an invocation that already exists -- under a different source,
    so the natural key would not stop it.
    """
    a_message(store, NOON_MS)
    store.commands.connection.execute(
        """
        INSERT INTO command_events (
            group_id, user_uuid, command, args, item_id, outcome, error_class,
            invoked_at_ms, day, local_hour, weekday, handler_ms, send_ms, source
        ) VALUES (?, ?, 'cat', '', NULL, 'ok', '', ?, ?, 12, 5, 10, 10, 'live')
        """,
        (GROUP, "u1", NOON_MS, DAY),
    )
    store.commands.connection.commit()

    report, events = backfill.plan(store, [a_line(NOON_MS + 100, "cat")])
    backfill.apply(store, events)

    assert report.journal_rows == 0
    assert [row[3] for row in rows(store)] == ["live"]


def test_a_pass_marks_the_groups_it_touched(store: Store) -> None:
    """The same marker stats/backfill.py writes, for the same reason."""
    a_message(store, NOON_MS)
    _report, events = backfill.plan(store, [a_line(NOON_MS, "cat")])
    backfill.apply(store, events)
    assert store.meta(GROUP, backfill.BACKFILL_KEY) == "done"


def test_the_report_counts_everything_and_names_nobody() -> None:
    """It is printed to a terminal and pasted into issues.

    The join's only input that could carry a person is a display name, and
    it dies inside the joiner -- so the summary has to be countable and
    nothing else.
    """
    report = backfill.Report(journal_rows=3, daily_rows=2, unmatched=1, ambiguous=4, groups=2)
    text = "\n".join(report.lines())
    assert "3" in text
    assert "ambiguous: 4" in text
    assert text.count("\n") == 4


def test_midnight_is_built_from_the_date_not_from_arithmetic() -> None:
    """Warsaw days are not all 24 hours; subtracting 86_400_000 lands wrong.

    2026-10-25 is the 25-hour day, so the gap from the 24th is not a day's
    worth of milliseconds and any spelling that assumes it is drifts.
    """
    short_day = backfill.midnight_ms("2026-10-25") - backfill.midnight_ms("2026-10-24")
    assert short_day == 24 * 3600 * 1000
    long_day = backfill.midnight_ms("2026-10-26") - backfill.midnight_ms("2026-10-25")
    assert long_day == 25 * 3600 * 1000