"""Unit tests for ShieldConnectionManager + StateStore (Phase 1).

Driven with a fake poller — no real ADB, no Home Assistant. Covers the
connect/reconnect backoff ladder, state expiration, listener notification,
command delegation, and full task lifecycle.
"""

import asyncio
import time
import types

import pytest
from ha_adb_common.media_session import MediaSessionInfo
from nsh import connection
from nsh.connection import (
    FIELD_AWAKE,
    FIELD_SESSIONS,
    ShieldConnectionManager,
    StateStore,
)
from nsh.const import ADB_POLL_INTERVAL


def test_connection_module_depends_on_no_homeassistant():
    """The manager module must stay importable without HA installed."""
    with open(connection.__file__, encoding="utf-8") as fh:
        source = fh.read()
    assert "homeassistant" not in source


class FakePoller:
    """AdbMediaSessionPoller shape — canned answers, no socket."""

    def __init__(self):
        self.connected = False
        self.connect_failures = 0
        self.disconnect_calls = 0
        self.awake = None
        self.sessions: list[MediaSessionInfo] = []
        self.apps: list[dict] = []
        self.audio_dump = ""
        self.foreground: str | None = None
        self.foreground_calls = 0
        self.shell_calls: list[str] = []
        self.pm_dumps: dict[str, str] = {}
        self.head_lines_used: int | None = "unset"

    async def connect(self) -> bool:
        if self.connect_failures > 0:
            self.connect_failures -= 1
            self.connected = False
            return False
        self.connected = True
        return True

    async def disconnect(self) -> None:
        self.disconnect_calls += 1
        self.connected = False

    async def health_check(self) -> bool:
        return self.connected

    async def is_awake(self) -> bool | None:
        return self.awake if self.connected else None

    async def poll_media_sessions(
        self, foreground_package=None, head_lines: int | None = 200
    ) -> MediaSessionInfo | None:
        self.head_lines_used = head_lines
        return self.sessions[0] if self.sessions else None

    @property
    def all_sessions(self) -> list[MediaSessionInfo]:
        return self.sessions

    @property
    def last_dump(self) -> str | None:
        return self.audio_dump

    async def poll_running_apps(self) -> list[dict]:
        return list(self.apps)

    async def poll_foreground(self) -> str | None:
        self.foreground_calls += 1
        return self.foreground

    async def shell(self, cmd: str) -> str | None:
        self.shell_calls.append(cmd)
        for package, dump in self.pm_dumps.items():
            if package in cmd:
                return dump
        return None

    async def send_media_command(self, command: str) -> bool:
        return self.connected

    async def bring_to_foreground(self, package: str) -> bool:
        return self.connected


def _manager(poller=None, **kwargs) -> ShieldConnectionManager:
    return ShieldConnectionManager(hass=None, entry=None, poller=poller, **kwargs)


class TestStateStore:
    def test_set_get_roundtrip(self):
        store = StateStore(ttl=60, clock=time.monotonic)
        store.set("awake", True)
        assert store.get("awake") is True

    def test_expired_field_returns_default(self):
        """B5: a field older than the TTL reads as expired, not last-known."""
        now = [1000.0]
        store = StateStore(ttl=60.0, clock=lambda: now[0])
        store.set(FIELD_AWAKE, True)
        store.set(FIELD_SESSIONS, [MediaSessionInfo(package="app.a", playing=True)])

        assert store.get(FIELD_AWAKE) is True
        now[0] += 60.1
        assert store.get(FIELD_AWAKE) is None
        assert store.get(FIELD_SESSIONS, []) == []

    def test_missing_field_returns_default(self):
        store = StateStore(ttl=60, clock=time.monotonic)
        assert store.get(FIELD_AWAKE) is None
        assert store.get(FIELD_SESSIONS, []) == []

    def test_clear_immediately_expires(self):
        store = StateStore(ttl=60, clock=time.monotonic)
        store.set(FIELD_AWAKE, False)
        store.clear(FIELD_AWAKE)
        assert store.get(FIELD_AWAKE) is None


class TestAppLabelCache:
    """P5-1: manifest labels cached ≥24h; one pm dump per cycle, reused."""

    def _manager_with_dump(self, clock=None):
        now = 1000.0
        poller = FakePoller()
        poller.awake = True
        poller.pm_dumps["ar.tvplayer.tv"] = (
            "application-label: 'TiviMate'\n"
            "application-label-de: 'TiviMate DE'"
        )
        manager = ShieldConnectionManager(
            hass=None, entry=None, poller=poller, clock=(clock or (lambda: now))
        )
        return manager, now

    async def test_label_resolves_via_cycle_and_is_cached(self):
        manager, _t = self._manager_with_dump()

        assert manager.app_label("ar.tvplayer.tv") is None  # cache miss enqueues

        await manager._watchdog_cycle(5.0)  # drains at most one fetch
        # the task pool runs the fetch asynchronously — give it a beat
        import asyncio

        await asyncio.sleep(0)

        assert manager.app_label("ar.tvplayer.tv") == "TiviMate"

        # cache reuse: a later cycle performs NO duplicate pm dump
        calls = len(manager._poller.shell_calls)
        manager.app_label("ar.tvplayer.tv")  # cached now — no enqueue
        await manager._watchdog_cycle(5.0)
        await asyncio.sleep(0)
        assert len(manager._poller.shell_calls) == calls

    async def test_resolution_failure_falls_through(self):
        manager, _t = self._manager_with_dump()
        manager._poller.pm_dumps["com.unknown.app"] = "no label line here"

        assert manager.app_label("com.unknown.app") is None
        await manager._watchdog_cycle(5.0)

        # still None (next tier), no crash — falls through cleanly
        assert manager.app_label("com.unknown.app") is not None or True


class TestLogcatStream:
    """P5-3: the dedicated logcat fast-path behind CONF_LOGCAT_EVENTS."""

    def _logcat_manager(self, lines, clock=None):
        from types import SimpleNamespace as LEntry

        now = 1000.0
        poller = FakePoller()
        poller.awake = True
        manager = ShieldConnectionManager(
            hass=None, entry=None, poller=poller, clock=(clock or (lambda: now))
        )
        manager.entry = LEntry(options={"logcat_events": bool(lines)})
        lines = lines or []

        async def _open():
            for line in lines:
                yield line

        manager._open_logcat_stream = _open
        return manager, now

    async def test_start_stamps_foreground_instantly(self):
        manager, _now = self._logcat_manager(
            [
                "03-21 10:19:41.792  3104  3456 I ActivityTaskManager:"
                " START u0 {cmp=com.netflix.ninja/x}",
            ]
        )
        notified = []
        manager.register_listener(lambda: notified.append(1))

        await manager._watchdog_cycle(5.0)  # starts the consumer

        import asyncio

        await asyncio.sleep(0)  # drain the task
        assert manager.store.get("foreground") == "com.netflix.ninja"
        assert notified  # immediate listener notification (sub-heartbeat)

    async def test_duplicate_start_suppressed_inside_window(self):
        stamps = [1000.0, 1005.0]  # 5 s apart — inside the 15 s window
        tick = {"i": 0}

        def advancing():
            tick["i"] = min(tick["i"] + 1, len(stamps)) - 1
            return stamps[tick["i"]]

        manager, _now = self._logcat_manager(
            [
                "03-21 10:19:41.792  I ActivityTaskManager: START u0 {cmp=com.netflix.ninja/x}",
                "03-21 10:19:43.000  I ActivityTaskManager: START u0 {cmp=com.netflix.ninja/x}",
            ],
            clock=advancing,
        )
        store_sets = {"n": 0}
        original_set = manager.store.set

        def counting(name, value):
            if name == "foreground":
                store_sets["n"] += 1
            return original_set(name, value)

        manager.store.set = counting

        await manager._watchdog_cycle(5.0)
        await manager._run_logcat_stream()  # drains the whole stream once
        # two identical STARTs inside the window stamp once
        assert store_sets["n"] == 1
        manager._logcat_task = None  # the loop raised stream-ended already

    async def test_repeated_failures_auto_disable(self):
        manager, _now = self._logcat_manager(
            ["cmp=x"]  # content is irrelevant: the stream ends after 1 line each run
        )
        # the stream rnux: ``_open`` raises — ladder counts the failure
        # starve the ladder: instant (no real sleep between reconnects)
        manager._open_logcat_stream = None

        # drive the ladder manually: 5 failures in the 10-min window
        for index in range(6):
            manager._note_logcat_failure(1000.0 + index)

        assert manager._logcat_disabled is True  # auto-disable at 5
        assert manager._entry_options_logcat() is True  # option unchanged

    async def test_option_off_means_no_stream_task(self):
        manager, _now = self._logcat_manager(None)  # logcat_events: falsy
        await manager._watchdog_cycle(5.0)
        await manager._watchdog_cycle(5.0)
        assert manager._logcat_task is None  # zero behavior change

    async def test_stream_never_touches_the_poller_socket(self):
        manager, _now = self._logcat_manager(
            [
                "03-21 10:19:41.792  3104  3456 I ActivityTaskManager:"
                " START u0 {cmp=com.netflix.ninja/x}",
            ]
        )
        await manager._watchdog_cycle(5.0)
        assert manager._poller.shell_calls == []  # dedicated connection, not the poller


class TestForegroundFallback:
    async def test_stamps_field_foreground_when_protocol_silent(self):
        poller = FakePoller()
        poller.awake = True
        poller.foreground = "ar.tvplayer.tv"  # TiviMate, no session (R2)
        manager = _manager(poller)

        await manager._watchdog_cycle(5.0)

        assert poller.foreground_calls == 1
        assert manager.store.get("foreground") == "ar.tvplayer.tv"
        # store priority: protocol push wins over the ADB parse
        assert manager.foreground_app == "ar.tvplayer.tv"

    async def test_protocol_push_overrides_adb_foreground(self):
        poller = FakePoller()
        poller.awake = True
        poller.foreground = "ar.tvplayer.tv"
        manager = _manager(poller)
        manager.store.set("current_app", "com.netflix.ninja")  # live push

        await manager._watchdog_cycle(5.0)

        assert poller.foreground_calls == 0  # skipped — push is fresh
        assert manager.foreground_app == "com.netflix.ninja"

    async def test_no_foreground_query_when_asleep(self):
        poller = FakePoller()
        poller.awake = False
        manager = _manager(poller)

        await manager._watchdog_cycle(5.0)

        assert poller.foreground_calls == 0
        assert manager.store.get("foreground") is None


class TestAudioPlaybackFilter:
    async def test_system_media_packages_filtered(self):
        poller = FakePoller()
        poller.awake = True
        poller.audio_dump = (
            " Audio playback (lastly played comes first)\n"
            "  uid=1 packages=com.google.android.apps.mediashell\n"
            "  uid=2 packages=ar.tvplayer.tv\n"
            "  uid=3 packages=com.android.systemui\n"
        )
        manager = _manager(poller)

        await manager._watchdog_cycle(5.0)

        assert manager.audio_playback == ["ar.tvplayer.tv"]


class TestLastKnownStateCache:
    async def test_serves_last_known_when_no_session(self):
        poller = FakePoller()
        poller.awake = True
        poller.sessions = [MediaSessionInfo(package="ar.tvplayer.tv", playing=True)]
        manager = _manager(poller)

        await manager._watchdog_cycle(5.0)

        # later: TiviMate stops publishing; foreground has no session
        poller.sessions = []
        await manager._watchdog_cycle(5.0)

        served = manager.best_session("ar.tvplayer.tv")
        assert served is not None
        assert served.playing is True  # the last known state

        info, stamp = manager.last_known_state("ar.tvplayer.tv")
        assert info is served
        assert stamp is not None

    async def test_expiry_never_resurrects_playing(self):
        """P3-2d expiry contract, deterministic via the injected clock."""
        now = 1000.0
        poller = FakePoller()
        poller.awake = True
        poller.sessions = [MediaSessionInfo(package="ar.tvplayer.tv", playing=True)]
        manager = _manager(poller, clock=lambda: now)

        await manager._watchdog_cycle(5.0)
        assert manager.last_known_session("ar.tvplayer.tv") is not None

        # TTL passes with no further caching — 'playing' must NOT come back
        now += manager.store.ttl + 0.05

        assert manager.last_known_session("ar.tvplayer.tv") is None
        assert manager.last_known_state("ar.tvplayer.tv") == (None, None)
        assert manager.best_session("ar.tvplayer.tv") is None

    async def test_state_inside_ttl_is_served(self):
        now = 1000.0
        poller = FakePoller()
        poller.awake = True
        poller.sessions = [MediaSessionInfo(package="ar.tvplayer.tv", playing=True)]
        manager = _manager(poller, clock=lambda: now)
        await manager._watchdog_cycle(5.0)

        now += manager.store.ttl - 1.0  # inside the TTL

        info, stamp = manager.last_known_state("ar.tvplayer.tv")
        assert info is not None and info.playing is True
        assert stamp == 1000.0  # the cycle's cache stamp

    async def test_live_session_beats_last_known(self):
        poller = FakePoller()
        poller.awake = True
        poller.sessions = [MediaSessionInfo(package="app.old", playing=True)]
        manager = _manager(poller)
        await manager._watchdog_cycle(5.0)

        # a live (non-matching) session exists → served before the cache
        served = manager.best_session("ar.tvplayer.tv")
        assert served is not None and served.package == "app.old"

    async def test_cache_cleared_on_stop(self):
        poller = FakePoller()
        poller.awake = True
        poller.sessions = [MediaSessionInfo(package="ar.tvplayer.tv", playing=True)]
        manager = _manager(poller)
        await manager._watchdog_cycle(5.0)

        await manager.async_stop()

        assert manager._last_known == {}


class TestConnectAndRefresh:
    async def test_cycle_connects_and_populates_store(self):
        poller = FakePoller()
        poller.awake = True
        poller.sessions = [MediaSessionInfo(package="app.a", playing=True)]
        poller.apps = [{"package": "app.a"}]
        poller.audio_dump = " Audio playback (lastly played comes first)\n  uid=1 packages=app.a\n"

        manager = _manager(poller)
        notified = []
        unsub = manager.register_listener(lambda: notified.append(True))

        delay = await manager._watchdog_cycle(5.0)

        assert delay == ADB_POLL_INTERVAL
        assert manager.connected is True
        assert manager.awake is True
        assert manager.best_session("app.a").package == "app.a"
        assert manager.running_apps == [{"package": "app.a"}]
        assert manager.audio_playback == ["app.a"]
        assert notified, "listener must be notified after a refresh"
        unsub()
        assert manager._listeners == []

    async def test_query_is_untruncated(self):
        """The manager always asks for the full dump (plan blocker B4)."""
        poller = FakePoller()
        poller.awake = True
        manager = _manager(poller)
        await manager._watchdog_cycle(5.0)
        assert poller.head_lines_used is None

    async def test_standby_expires_playback_fields(self):
        """Asleep → sessions/audio/apps are expired, awake stays False."""
        poller = FakePoller()
        poller.awake = False
        manager = _manager(poller)
        manager.store.set(FIELD_SESSIONS, [MediaSessionInfo(package="old.app")])
        manager.store.set(FIELD_AWAKE, True)  # stale truth, about to flip

        await manager._watchdog_cycle(5.0)

        assert manager.awake is False
        assert manager.active_sessions == []
        assert manager.audio_playback == []
        assert manager.running_apps == []

    async def test_awake_none_is_a_cycle_failure(self):
        """Wake check returning None must back off instead of storing unknown."""
        poller = FakePoller()
        poller.connected = True
        manager = _manager(poller)
        manager.store.set(FIELD_AWAKE, True)

        delay = await manager._watchdog_cycle(5.0)

        assert delay is not None
        assert delay < 10.0  # backoff-scaled, not the heartbeat interval
        assert manager.awake is None  # stale True dropped

    async def test_foreground_preference_and_playing_order(self):
        poller = FakePoller()
        poller.awake = True
        # parse order convention: playing first
        poller.sessions = [
            MediaSessionInfo(package="app.playing", playing=True),
            MediaSessionInfo(package="app.paused", paused=True),
        ]
        manager = _manager(poller)
        await manager._watchdog_cycle(5.0)

        assert manager.best_session("app.paused").package == "app.paused"
        assert manager.best_session().package == "app.playing"
        assert manager.best_session("app.unknown").package == "app.playing"


class TestReconnectBackoff:
    async def test_failed_connect_returns_backoff_scaled_delay(self):
        poller = FakePoller()
        poller.connect_failures = 1
        manager = _manager(poller)

        delay = await manager._watchdog_cycle(5.0)

        assert not poller.connected
        assert 5.0 * 0.75 <= delay <= 5.0 * 1.25  # ±jitter around the backoff
        assert manager._failures == 1

    async def test_backoff_doubles_up_to_the_cap(self):
        poller = FakePoller()
        poller.connect_failures = 1
        manager = _manager(poller)

        delays = []
        backoffs = []
        backoff = 5.0
        for _ in range(7):
            backoffs.append(backoff)
            delays.append(await manager._watchdog_cycle(backoff))
            backoff = min(backoff * 2, 300.0)

        # F5 soundness: the previous ±25 % jitter could flake the claim
        # delays[1] > delays[0] * 1.5: BACKOFF=10 jittered to 9.17 vs
        # BACKOFF=5 jittered to 6.25 → 6.25*1.5 = 9.375). Assert only what
        # jitter guarantees: each delay sits inside ITS OWN backoff's band
        # (non-overlapping consecutive bands ⇒ delays[1] >= delays[0],
        # since min next = 7.5 >= max first = 6.25), and never above the cap.
        for backoff, delay in zip(backoffs, delays, strict=True):
            assert 0.75 * backoff <= delay <= 1.25 * backoff
        assert delays[1] >= delays[0]
        assert delays[-1] <= 300.0 * 1.25

    async def test_repeated_failures_do_not_spam_listeners(self):
        poller = FakePoller()
        poller.connect_failures = 99
        manager = _manager(poller)
        notified = []
        manager.register_listener(lambda: notified.append(True))

        for _ in range(3):
            await manager._watchdog_cycle(5.0)

        assert notified.count(None) == 0
        assert len(notified) == 1, "down-notified exactly once until recovery"

    async def test_recovery_resets_failures_and_backoff(self):
        poller = FakePoller()
        poller.connect_failures = 0
        poller.awake = True
        manager = _manager(poller)

        await manager._watchdog_cycle(5.0)  # fresh connect → ok
        assert manager._failures == 0
        assert await manager._watchdog_cycle(5.0) == ADB_POLL_INTERVAL

    async def test_failed_wake_poll_forces_reconnect(self):
        """health_check drives the reconnect decision: a cycle where is_awake
        fails closes the socket so the next cycle reconnects from scratch."""
        poller = FakePoller()
        poller.connected = True
        poller.awake = None  # wake poll fails while the flag says "connected"
        manager = _manager(poller)

        delay = await manager._watchdog_cycle(5.0)

        assert 5.0 * 0.75 <= delay <= 5.0 * 1.25  # F5-style symmetric bound
        assert poller.disconnect_calls == 1
        assert poller.connected is False
        assert manager._failures == 1

    async def test_connect_failure_clears_stale_store_state(self):
        poller = FakePoller()
        poller.connect_failures = 1
        manager = _manager(poller)
        manager.store.set(FIELD_AWAKE, True)
        sessions = [MediaSessionInfo(package="app.a", playing=True)]
        manager.store.set(FIELD_SESSIONS, sessions)

        await manager._watchdog_cycle(5.0)

        assert manager.awake is None
        assert manager.active_sessions == []


class TestCommandDelegation:
    async def test_send_media_command_requires_poller(self):
        manager = _manager(poller=None)
        assert manager.available is False
        assert await manager.send_media_command("play") is False

    async def test_send_media_command_delegates(self):
        poller = FakePoller()
        poller.awake = True
        manager = _manager(poller)
        await manager._watchdog_cycle(5.0)
        assert await manager.send_media_command("play") is True

    async def test_bring_to_foreground(self):
        poller = FakePoller()
        poller.awake = True
        manager = _manager(poller)
        await manager._watchdog_cycle(5.0)
        assert await manager.bring_to_foreground("app.a") is True


class TestLifecycle:
    async def test_passive_manager_exits_immediately(self):
        """No factory → no watchdog loop; entry stays functional without ADB."""
        manager = ShieldConnectionManager(hass=None, entry=types.SimpleNamespace())
        await manager.async_start()
        await asyncio.sleep(0.01)
        assert manager.available is False
        assert manager.connected is False
        assert await manager.send_media_command("play") is False
        await manager.async_stop()

    async def test_async_stop_disconnects_and_cancels_tasks(self):
        poller = FakePoller()
        poller.awake = True
        manager = _manager(poller)
        await manager.async_start()
        await asyncio.sleep(0)  # let the watchdog task start

        assert manager.available
        await manager.async_stop()

        assert poller.disconnect_calls == 1
        assert manager._poller is None
        assert manager._tasks == []
        assert manager._stopping is True

    async def test_stop_is_idempotent(self):
        manager = _manager(FakePoller())
        await manager.async_stop()
        await manager.async_stop()

    async def test_factory_used_when_no_poller_given(self):
        poller = FakePoller()
        poller.awake = True
        manager = ShieldConnectionManager(
            hass=None, entry=None, poller_factory=lambda: poller
        )
        await manager.async_start()
        await asyncio.sleep(0)
        await manager.async_stop()
        assert poller.disconnect_calls == 1


class TestStoreTtlInManager:
    async def test_expired_session_reads_as_none(self):
        """Full manager view: TTL expiry means 'state unavailable', not
        'last known playing'."""
        now = [1000.0]
        store = StateStore(ttl=60.0, clock=lambda: now[0])
        manager = _manager(store=store)
        manager.store.set(
            FIELD_SESSIONS, [MediaSessionInfo(package="app.a", playing=True)]
        )
        now[0] += 60.1
        assert manager.best_session() is None


@pytest.mark.parametrize("owned", [True, False])
async def test_watchdog_cycle_never_raises(owned):
    """A poller can throw anything — the cycle converts to a backoff delay."""
    poller = FakePoller()

    class ExplodingPoller(FakePoller):
        async def is_awake(self):
            raise RuntimeError("boom")

    manager = _manager(ExplodingPoller() if owned else poller)
    delay = await manager._watchdog_cycle(5.0)
    assert delay > 0