# Copyright (c) 2026 Krzysztof Rudnicki. MIT licence.
"""What !analityka says, and the two things it must never say."""

from __future__ import annotations

import datetime as dt
from typing import TYPE_CHECKING

from signal_bot.analytics import render
from signal_bot.analytics.demand import Demand, NearMiss
from signal_bot.analytics.hours import Peak
from signal_bot.analytics.render import Summary
from signal_bot.analytics.scope import Window
from signal_bot.analytics.usage import CommandUse, PersonUse
from signal_bot.analytics_command import register_analytics_command, triggers_for
from signal_bot.dispatcher import Dispatcher
from signal_bot.registry import CommandRegistry
from signal_bot.registry_holder import RegistryHolder
from signal_bot.stats.events import MessageEvent
from tests.analytics_seed import ALA, BASIA, Shape, ran
from tests.conftest import WATCHED_GROUP, envelope

if TYPE_CHECKING:
    from signal_bot.context import CommandContext
    from signal_bot.store import Store
    from signal_bot.transport_fake import FakeTransport

DAY = "2026-08-29"
NOW = dt.datetime(2026, 8, 29, 12, 0, tzinfo=dt.UTC)


def a_registry() -> CommandRegistry:
    """A registry with the command under test on it."""
    registry = CommandRegistry()
    register_analytics_command(registry, aliases={"command_stats": ["!analityka"]})
    return registry


def seed(store: Store, *, group_id: str = WATCHED_GROUP) -> None:
    """A small history with a name attached to one of the two people."""
    for minute in range(3):
        ran(
            store,
            day=DAY,
            hour=19,
            minute=minute,
            who=ALA,
            command="pope",
            shape=Shape(group_id=group_id),
        )
    ran(store, day=DAY, hour=9, who=BASIA, command="cat", shape=Shape(group_id=group_id))
    store.events.record(
        MessageEvent(
            group_id=group_id,
            uuid=ALA,
            display_name="ala",
            sent_at_ms=1,
            day=DAY,
            local_hour=19,
            is_command=True,
        )
    )
    store.events.note_person(group_id, ALA, "ala", "", DAY)


async def reply_of(dispatcher: Dispatcher, transport: FakeTransport) -> str:
    """Run !analityka and return what went into the group."""
    await dispatcher.handle(envelope(text="!analityka"))
    return transport.sent[-1].text


def test_an_empty_history_says_so_in_one_line() -> None:
    """A fresh install must not answer with a blank block."""
    summary = render.Summary(
        measured=Window(),
        uses=(),
        people=(),
        names={},
        peak=Peak(),
        direction="unknown",
        demand=Demand(),
        asker=ALA,
        commands=0,
        messages=0,
    )
    assert render.render(summary) == render.NOTHING_YET


def test_the_reply_is_capped_at_twelve_lines() -> None:
    """The cap, on a summary that fills every optional line."""
    summary = Summary(
        measured=Window(first_day=DAY, last_day="2026-09-30", days=30, events=99),
        uses=(
            CommandUse("pope", 40, 3, 30, 8, 2, DAY, DAY),
            CommandUse("cat", 10, 2, 10, 0, 0, DAY, DAY),
            CommandUse("dog", 1, 1, 1, 0, 0, DAY, DAY),
        ),
        people=(PersonUse(ALA, 30, 3, "pope"), PersonUse(BASIA, 5, 1, "cat")),
        names={ALA: "ala", BASIA: "basia"},
        peak=Peak(busiest=19, busiest_uses=20, quietest=5, quietest_uses=1),
        direction="rising",
        demand=Demand(near_misses=(NearMiss("!pulapka", 17, 4),)),
        asker=ALA,
        commands=99,
        messages=300,
    )
    lines = render.render(summary).split("\n")
    assert len(lines) <= render.MAX_LINES
    assert lines[0] == render.HEADING
    # Every line earned its place; none is blank padding.
    assert all(line.strip() for line in lines)


def test_the_window_is_stated_before_anything_is_claimed(store: Store) -> None:
    """The bot is days old, and a reader has to be able to see that."""
    line = render.window_line(Window(first_day=DAY, last_day=DAY, days=1, events=4))
    assert line.startswith("Okno: 1 dzień")
    assert "4 razy" in line


def test_a_span_of_days_names_both_ends() -> None:
    line = render.window_line(
        Window(first_day="2026-08-29", last_day="2026-08-31", days=3, events=10)
    )
    assert "3 dni" in line
    assert "29 sierpnia" in line
    assert "31 sierpnia" in line


def test_no_line_carries_padding() -> None:
    """Signal renders a proportional font, so ljust lines up on nobody's phone."""
    line = render.window_line(Window(first_day=DAY, last_day=DAY, days=1, events=1))
    assert line == line.strip()
    assert "  " not in line


def test_a_direction_is_only_worded_when_there_is_one() -> None:
    assert render.trend_line("unknown") == ""
    assert render.trend_line("rising") == "użycie rośnie"
    assert render.trend_line("falling") == "użycie spada"
    assert render.trend_line("flat") == "użycie się trzyma"


def test_nobody_is_named_without_a_display_name() -> None:
    """The roster knows the rest as a uuid or a phone number, and both leak."""
    people = (PersonUse(ALA, 5, 2, "pope"), PersonUse(BASIA, 3, 1, "cat"))
    assert render.people_line(people, {}) == ""
    named = render.people_line(people, {ALA: "ala"})
    assert named == "Kto najwięcej: ala 5"
    assert BASIA not in named


def test_the_asker_gets_their_own_favourite_and_nobody_elses() -> None:
    """Self-scope: a per-person breakdown of everybody stays off the chat."""
    people = (PersonUse(ALA, 5, 2, "pope"), PersonUse(BASIA, 3, 1, "cat"))
    assert render.mine_line(people, ALA) == "Twoja ulubiona: !pope (5 razy)"
    assert render.mine_line(people, "uuid-nobody") == ""


def test_a_healthy_bot_says_nothing_about_health() -> None:
    """A line with nothing to say is dropped, never printed empty."""
    healthy = (CommandUse("cat", 3, 1, 3, 0, 0, DAY, DAY),)
    assert render.health_line(healthy) == ""


def test_the_worst_command_is_named_with_what_is_wrong() -> None:
    """Refusals count as much as errors: both read as "it does not work"."""
    uses = (
        CommandUse("cat", 10, 2, 6, 3, 1, DAY, DAY),
        CommandUse("dog", 4, 1, 4, 0, 0, DAY, DAY),
    )
    line = render.health_line(uses)
    assert line.startswith("Do poprawki: !cat")
    assert "błędów: 1" in line
    assert "odmów: 3" in line


def test_only_what_is_actually_wrong_is_listed() -> None:
    """A command that only crashes says nothing about refusals, and vice versa."""
    crashing = (CommandUse("cat", 5, 1, 3, 0, 2, DAY, DAY),)
    assert render.health_line(crashing) == "Do poprawki: !cat (błędów: 2)"

    refusing = (CommandUse("cat", 5, 1, 3, 2, 0, DAY, DAY),)
    assert render.health_line(refusing) == "Do poprawki: !cat (odmów: 2)"


def test_share_of_chat_is_omitted_when_there_is_no_chat() -> None:
    assert render.share_line(0, 0) == ""
    assert render.share_line(1, 4) == "Komendy to 25% wiadomości w tej grupie"


def test_triggers_are_scoped_to_the_group_that_asked() -> None:
    """The album's triggers are real people's names.

    Reporting a near miss against one outside its group would announce that
    the album exists, which is the leak the dispatcher already refuses at
    resolution time.
    """

    async def handler(_ctx: CommandContext) -> None:
        pass

    registry = CommandRegistry()
    registry.register("cat", ["!kot"], handler, "kot")
    registry.register("pack:p1", ["!ala"], handler, "ala", groups=frozenset({"album=="}))

    here = triggers_for(registry.commands, "somewhere-else==")
    there = triggers_for(registry.commands, "album==")
    assert "!ala" not in here
    assert "!ala" in there


async def test_the_command_answers_in_the_group_that_asked(
    config: object,
    directory: object,
    store: Store,
    transport: FakeTransport,
) -> None:
    """The whole path: a real frame, the real dispatcher, a real reply."""
    seed(store)
    dispatcher = Dispatcher(
        config=config,
        directory=directory,
        holder=RegistryHolder(a_registry),
        store=store,
        transport=transport,
        clock=lambda: NOW,
    )
    text = await reply_of(dispatcher, transport)

    assert text.startswith(render.HEADING)
    assert "!pope" in text
    assert "ala" in text
    assert len(text.split("\n")) <= render.MAX_LINES