import re
from collections.abc import AsyncIterator
from datetime import timedelta
from pathlib import Path

import pytest
from aiogram import Bot, Dispatcher
from aiogram.methods import AnswerCallbackQuery, EditMessageText, SendMessage, SendPhoto

from app.access.service import AccessService
from app.alerts import broadcast
from app.alerts.broadcast import TelegramNotifier
from app.alerts.detectors import load_alerts_config
from app.alerts.monitor import AlertMonitor, free_disk_pct
from app.alerts.service import AlertService
from app.bot.routers.alerts import PER_PAGE, AlertsAct, AlertsCb
from app.bot.routers.members import MembersAction, MembersCb
from app.db.models import utcnow
from app.db.session import SessionMaker
from app.main import build_dispatcher
from app.repo.git import UploadsRepo
from app.runtime.docker import DockerClient
from app.runtime.snapshots import SnapshotStore, collect_once
from app.texts import Texts
from tests.conftest import ADMIN, ROOT
from tests.fakes import TgClient
from tests.runtime.fake_docker import FakeDocker, now_minus

MEMBER, BLOCKED = 5005, 6006
CFG = load_alerts_config(ROOT / "config").model_copy(update={"resolve_after": 0})  # hysteresis: tests/alerts


@pytest.fixture(autouse=True)
def _no_pacing(monkeypatch: pytest.MonkeyPatch) -> None:
    monkeypatch.setattr(broadcast, "PACE", 0)


@pytest.fixture
def fake() -> FakeDocker:
    fake = FakeDocker()
    fake.add("web", logs=[(now_minus(1), f"line {i}") for i in range(40)])
    return fake


@pytest.fixture
async def docker(fake: FakeDocker) -> AsyncIterator[DockerClient]:
    async with fake.client() as client:
        yield client


class Env:
    def __init__(self, tg: TgClient, alerts: AlertService, monitor: AlertMonitor, store: SnapshotStore) -> None:
        self.tg, self.alerts, self.monitor, self.store = tg, alerts, monitor, store
        self.disk_free: float | None = 50.0


@pytest.fixture
async def env(
    texts: Texts, sessions: SessionMaker, access: AccessService, repo: UploadsRepo, docker: DockerClient
) -> Env:
    store = SnapshotStore(sessions)
    holder: dict[str, object] = {}

    def dispatcher(bot: Bot) -> Dispatcher:
        alerts = AlertService(
            sessions, TelegramNotifier(bot, access, sessions, texts), CFG, lambda cid, n: docker.logs(cid, tail=n)
        )
        holder["alerts"] = alerts
        return build_dispatcher(texts, sessions, access, repo, docker=docker, alerts=alerts)

    tg = TgClient(dispatcher)
    alerts = holder["alerts"]
    assert isinstance(alerts, AlertService)
    e = Env(tg, alerts, None, store)  # type: ignore[arg-type]
    e.monitor = AlertMonitor(alerts, store, CFG, disk=lambda _: e.disk_free)
    for user in (MEMBER, BLOCKED):
        await tg.press(ADMIN, MembersCb(action=MembersAction.INVITE).pack())
        token = re.search(r"start=([A-Za-z0-9_-]+)", tg.session.sent(SendPhoto)[-1].caption or "")
        assert token
        await tg.send(user, f"/start {token.group(1)}")
    tg.session.blocked.add(BLOCKED)
    tg.session.requests.clear()
    return e


async def round_(env: Env, docker: DockerClient) -> None:
    await env.monitor.on_round(await collect_once(docker, env.store))


async def test_crash_broadcast_to_everyone_and_recovery_reply(env: Env, fake: FakeDocker, docker: DockerClient) -> None:
    web = next(iter(fake.containers.values()))
    web.state, web.health, web.exit_code = "exited", None, 1

    await round_(env, docker)
    await round_(env, docker)  # still down: no second message

    sent = env.tg.session.sent(SendMessage)
    assert sorted(m.chat_id for m in sent) == [ADMIN, MEMBER, BLOCKED]  # tried everyone, the blocked one quietly
    msg = sent[0]
    assert msg.text.startswith("💥 Краш · <b>web</b>\nКонтейнер вышел с кодом 1.")
    assert "line 39" in msg.text and "line 9\n" not in msg.text  # last 30 lines
    buttons = [b.text for row in msg.reply_markup.inline_keyboard for b in row]
    assert buttons == ["📜 Логи", "🩺 Статус", "📋 Список алертов"]

    env.tg.session.requests.clear()
    web.state, web.health, web.exit_code = "running", "healthy", 0
    await round_(env, docker)

    recovered = env.tg.session.sent(SendMessage)
    assert sorted(m.chat_id for m in recovered) == [ADMIN, MEMBER]  # only where the alert was delivered
    assert all(m.text.startswith("✅ Восстановлено · 💥 Краш · web") for m in recovered)
    assert all(m.reply_parameters is not None for m in recovered)


async def test_flap_edits_counter_instead_of_new_message(env: Env, fake: FakeDocker, docker: DockerClient) -> None:
    web = next(iter(fake.containers.values()))
    web.health = "unhealthy"
    await round_(env, docker)
    web.health = "healthy"
    await round_(env, docker)
    env.tg.session.requests.clear()

    web.health = "unhealthy"
    await round_(env, docker)

    assert not env.tg.session.sent(SendMessage)
    edits = env.tg.session.sent(EditMessageText)
    assert len(edits) == 2 and all("повторов: 2" in e.text for e in edits)


async def test_docker_down_and_disk_low(env: Env, fake: FakeDocker, docker: DockerClient) -> None:
    env.disk_free = 3.0
    await round_(env, docker)
    disk, *_ = env.tg.session.sent(SendMessage)
    assert disk.text.startswith("💾 Мало места на хосте · <b>хост</b>\nСвободно 3.0% диска.")

    env.tg.session.requests.clear()
    clock = [utcnow()]
    env.monitor._clock = lambda: clock[0]
    await env.monitor.on_round(None)
    clock[0] += timedelta(minutes=6)
    await env.monitor.on_round(None)

    down = env.tg.session.sent(SendMessage)
    assert len(down) == 3 and down[0].text.startswith("🔌 Зависимость недоступна · <b>docker</b>")


async def test_list_and_card(env: Env, fake: FakeDocker, docker: DockerClient, texts: Texts) -> None:
    web = next(iter(fake.containers.values()))
    web.state, web.health, web.exit_code = "exited", None, 2
    await round_(env, docker)
    env.tg.session.requests.clear()

    await env.tg.send(MEMBER, texts.menu.alerts)
    [listing] = env.tg.session.sent(SendMessage)
    assert listing.text.startswith("🚨 Алерты · активных: 1 · всего за 7 дней: 1")
    [first, _back] = [row[0] for row in listing.reply_markup.inline_keyboard]
    assert first.text.startswith("🔴 💥 Краш · web")

    await env.tg.press(MEMBER, first.callback_data, message_text=listing.text)
    [card] = env.tg.session.sent(EditMessageText)
    assert "Конец: продолжается" in card.text and "Повторов: 1" in card.text


async def test_buttons_under_alert_open_new_messages(
    env: Env, fake: FakeDocker, docker: DockerClient, texts: Texts
) -> None:
    web = next(iter(fake.containers.values()))
    web.health = "unhealthy"
    await round_(env, docker)
    alert_msg = env.tg.session.sent(SendMessage)[0]
    env.tg.session.requests.clear()
    cid = web.id[:12]

    for act in (AlertsAct.LOGS, AlertsAct.STATUS, AlertsAct.LIST):
        await env.tg.press_markup(MEMBER, AlertsCb(a=act, c=cid).pack(), alert_msg.reply_markup)

    assert not env.tg.session.sent(EditMessageText)  # the alert itself stays intact
    logs_msg, status_msg, list_msg = env.tg.session.sent(SendMessage)
    assert logs_msg.text.startswith("📜 Логи · web")
    assert status_msg.text.startswith("🔴 web")
    assert list_msg.text.startswith("🚨 Алерты")


async def test_pagination(env: Env, texts: Texts) -> None:
    from app.alerts.detectors import MONITORED, Condition
    from app.db.models import AlertKind

    now = utcnow()
    for i in range(PER_PAGE + 3):
        await env.alerts.sync([Condition(AlertKind.UNHEALTHY, f"s{i:02}")], frozenset({AlertKind.UNHEALTHY}), now)
    env.tg.session.requests.clear()

    await env.tg.press(MEMBER, AlertsCb(a=AlertsAct.LIST, p=1).pack())

    [page2] = env.tg.session.sent(EditMessageText)
    assert "Стр. 2 из 2" in page2.text
    assert len(page2.reply_markup.inline_keyboard) == 3 + 1 + 1  # 3 alerts, ◀️, back
    assert MONITORED


async def test_missing_or_admin_only_alert_card(env: Env, texts: Texts) -> None:
    await env.tg.press(MEMBER, AlertsCb(a=AlertsAct.CARD, id=999).pack())

    [ack] = env.tg.session.sent(AnswerCallbackQuery)
    assert ack.text == texts.alerts.gone


def test_free_disk_pct(tmp_path: Path) -> None:
    pct = free_disk_pct(tmp_path)
    assert pct is not None and 0 <= pct <= 100
    assert free_disk_pct(tmp_path / "nope") is None