"""Tests for the activity bump that keeps the schedule post at the bottom of
the channel (slack-bot handle_channel_message)."""

import time

from freezegun import freeze_time

CHANNEL = "C_TEST"
MON = "2026-06-08 12:00:00"


class _SlackError(Exception):
    """Stand-in for slack_sdk.errors.SlackApiError with a `.response` dict."""

    def __init__(self, code):
        super().__init__(code)
        self.response = {"error": code}


def _msg(channel=CHANNEL, user="U_ALICE", ts="100.500", **extra):
    return {"channel": channel, "user": user, "ts": ts, **extra}


@freeze_time(MON)
def test_bumps_on_new_message(slackbot_app, schedule, seed, client):
    seed.schedule_post(CHANNEL, "111.111")
    client.chat_postMessage.return_value = {"ts": "222.222"}

    slackbot_app.handle_channel_message(_msg(), client, schedule, CHANNEL)

    client.chat_delete.assert_called_once()
    assert client.chat_delete.call_args.kwargs["ts"] == "111.111"
    client.chat_postMessage.assert_called_once()
    # The stored ts now points at the freshly reposted message + debounce stamp.
    post = schedule.get_schedule_post(CHANNEL)
    assert post["message_ts"] == "222.222"
    assert post.get("last_bump_ts") is not None


@freeze_time(MON)
def test_debounce_skips_within_window(slackbot_app, schedule, client):
    schedule.save_schedule_post(
        CHANNEL, "111.111", "2026-06-08", last_bump_ts=time.time()
    )

    slackbot_app.handle_channel_message(_msg(), client, schedule, CHANNEL)

    client.chat_delete.assert_not_called()
    client.chat_postMessage.assert_not_called()
    # Stored post is untouched.
    assert schedule.get_schedule_post(CHANNEL)["message_ts"] == "111.111"


@freeze_time(MON)
def test_bumps_after_debounce_window(slackbot_app, schedule, client):
    old = time.time() - (slackbot_app.SCHEDULE_BUMP_DEBOUNCE_SECONDS + 60)
    schedule.save_schedule_post(CHANNEL, "111.111", "2026-06-08", last_bump_ts=old)
    client.chat_postMessage.return_value = {"ts": "222.222"}

    slackbot_app.handle_channel_message(_msg(), client, schedule, CHANNEL)

    client.chat_postMessage.assert_called_once()
    assert schedule.get_schedule_post(CHANNEL)["message_ts"] == "222.222"


@freeze_time(MON)
def test_skips_when_no_stored_post(slackbot_app, schedule, client):
    slackbot_app.handle_channel_message(_msg(), client, schedule, CHANNEL)

    client.chat_delete.assert_not_called()
    client.chat_postMessage.assert_not_called()


@freeze_time(MON)
def test_skips_bots_own_message(slackbot_app, schedule, seed, client):
    seed.schedule_post(CHANNEL, "111.111")

    slackbot_app.handle_channel_message(_msg(bot_id="B123"), client, schedule, CHANNEL)

    client.chat_delete.assert_not_called()
    client.chat_postMessage.assert_not_called()


@freeze_time(MON)
def test_skips_message_edit_and_delete_subtypes(slackbot_app, schedule, seed, client):
    seed.schedule_post(CHANNEL, "111.111")

    slackbot_app.handle_channel_message(
        _msg(subtype="message_changed"), client, schedule, CHANNEL
    )

    client.chat_delete.assert_not_called()
    client.chat_postMessage.assert_not_called()


@freeze_time(MON)
def test_skips_other_channel(slackbot_app, schedule, seed, client):
    seed.schedule_post(CHANNEL, "111.111")

    slackbot_app.handle_channel_message(
        _msg(channel="C_OTHER"), client, schedule, CHANNEL
    )

    client.chat_delete.assert_not_called()
    client.chat_postMessage.assert_not_called()


@freeze_time(MON)
def test_retried_event_is_a_noop(slackbot_app, schedule, seed, client):
    # A Slack retry (X-Slack-Retry-Num set) must never trigger a second bump.
    seed.schedule_post(CHANNEL, "111.111")

    slackbot_app.handle_channel_message(
        _msg(), client, schedule, CHANNEL, retry_num="1"
    )

    client.chat_delete.assert_not_called()
    client.chat_postMessage.assert_not_called()
    # The record is left untouched (no optimistic debounce stamp either).
    post = schedule.get_schedule_post(CHANNEL)
    assert post["message_ts"] == "111.111"
    assert post.get("last_bump_ts") is None


@freeze_time(MON)
def test_thread_reply_is_a_noop(slackbot_app, schedule, seed, client):
    # A threaded reply doesn't push the schedule down the main timeline.
    seed.schedule_post(CHANNEL, "111.111")

    slackbot_app.handle_channel_message(
        _msg(thread_ts="050.000"), client, schedule, CHANNEL
    )

    client.chat_delete.assert_not_called()
    client.chat_postMessage.assert_not_called()
    assert schedule.get_schedule_post(CHANNEL)["message_ts"] == "111.111"


@freeze_time(MON)
def test_stamps_debounce_before_repost(slackbot_app, schedule, seed, client):
    # The debounce window is stamped optimistically before the delete/repost so
    # a retry mid-bump is suppressed even if this run dies before the final save.
    seed.schedule_post(CHANNEL, "111.111")
    captured = {}

    def _delete(**kwargs):
        # Mid-bump snapshot: the record already carries last_bump_ts.
        captured["post"] = schedule.get_schedule_post(CHANNEL)

    client.chat_delete.side_effect = _delete
    client.chat_postMessage.return_value = {"ts": "222.222"}

    slackbot_app.handle_channel_message(_msg(), client, schedule, CHANNEL)

    assert captured["post"].get("last_bump_ts") is not None


@freeze_time(MON)
def test_skips_when_bot_not_in_channel(slackbot_app, schedule, seed, client):
    seed.schedule_post(CHANNEL, "111.111")
    client.chat_delete.side_effect = _SlackError("not_in_channel")

    slackbot_app.handle_channel_message(_msg(), client, schedule, CHANNEL)

    # No repost, and the stored post is left intact.
    client.chat_postMessage.assert_not_called()
    assert schedule.get_schedule_post(CHANNEL)["message_ts"] == "111.111"


@freeze_time(MON)
def test_reposts_when_old_message_already_gone(slackbot_app, schedule, seed, client):
    # A stale ts (deleted manually) → delete fails non-fatally; still reposts.
    seed.schedule_post(CHANNEL, "111.111")
    client.chat_delete.side_effect = _SlackError("message_not_found")
    client.chat_postMessage.return_value = {"ts": "222.222"}

    slackbot_app.handle_channel_message(_msg(), client, schedule, CHANNEL)

    client.chat_postMessage.assert_called_once()
    assert schedule.get_schedule_post(CHANNEL)["message_ts"] == "222.222"