import json
import asyncio
import os
from types import SimpleNamespace

import httpx
import pytest

from src import dashboard_auth, gitea_proxy, main
from src.push_notifications import PushConfiguration, dispatch_unread_updates
from src.push_subscription_store import PushSubscriptionStore


def test_dispatch_lease_is_exclusive_recoverable_and_owner_fenced(tmp_path):
    path = tmp_path / "push.sqlite3"
    first = PushSubscriptionStore(path)
    second = PushSubscriptionStore(path)

    assert first.acquire_dispatch_lease("worker-a", now=100, lease_seconds=30) is True
    assert second.acquire_dispatch_lease("worker-b", now=100, lease_seconds=30) is False
    assert second.acquire_dispatch_lease("worker-b", now=131, lease_seconds=30) is True

    assert first.release_dispatch_lease("worker-a") is False
    assert second.release_dispatch_lease("worker-b") is True


def test_subscription_store_uses_private_filesystem_permissions(tmp_path):
    state_dir = tmp_path / "push-state"
    previous_umask = os.umask(0)
    try:
        database = state_dir / "push.sqlite3"
        PushSubscriptionStore(database)
    finally:
        os.umask(previous_umask)

    assert state_dir.stat().st_mode & 0o777 == 0o700
    assert database.stat().st_mode & 0o777 == 0o600


def test_subscription_store_delivers_each_unread_thread_once_per_device(tmp_path):
    store = PushSubscriptionStore(tmp_path / "push.sqlite3")
    subscription = {
        "endpoint": "https://push.example/device-a",
        "keys": {"p256dh": "public-key", "auth": "auth-secret"},
    }

    store.upsert("session-a", subscription)

    first = store.claim_unseen({41, 42})
    store.mark_delivered("session-a", first[0].thread_ids)
    second = store.claim_unseen({41, 42})

    assert [(item.session_id, item.thread_ids) for item in first] == [
        ("session-a", (41, 42))
    ]
    assert second == []


@pytest.mark.anyio
async def test_managed_session_active_applies_configured_idle_deadline(monkeypatch):
    calls = []

    class Store:
        def managed_status(self, management_id, *, idle_timeout_seconds):
            calls.append((management_id, idle_timeout_seconds))
            return "active" if management_id == "active-device" else "idle"

    monkeypatch.setenv("STACKCHAIN_DASHBOARD_IDLE_TIMEOUT_SECONDS", "321")
    monkeypatch.setattr(dashboard_auth, "_session_store", lambda: Store())

    assert await dashboard_auth.managed_session_active("active-device") is True
    assert await dashboard_auth.managed_session_active("idle-device") is False
    assert calls == [("active-device", 321), ("idle-device", 321)]


@pytest.mark.anyio
async def test_push_poll_authorizes_delivery_against_managed_session(monkeypatch):
    captured = {}

    async def no_wait(_seconds):
        return None

    async def stop_after_capture(*_args, **kwargs):
        captured.update(kwargs)
        raise asyncio.CancelledError

    monkeypatch.setenv("STACKCHAIN_PUSH_MAX_CONCURRENCY", "3")
    monkeypatch.setattr(main.asyncio, "sleep", no_wait)
    monkeypatch.setattr(main, "dispatch_unread_updates", stop_after_capture)

    with pytest.raises(asyncio.CancelledError):
        await main._push_poll_loop()

    assert captured["session_active"] is dashboard_auth.managed_session_active
    assert captured["max_concurrency"] == 3


def test_replacing_subscription_resets_delivery_cursor_and_revocation_removes_device(tmp_path):
    store = PushSubscriptionStore(tmp_path / "push.sqlite3")
    original = {
        "endpoint": "https://push.example/original",
        "keys": {"p256dh": "old-key", "auth": "old-auth"},
    }
    replacement = {
        "endpoint": "https://push.example/replacement",
        "keys": {"p256dh": "new-key", "auth": "new-auth"},
    }
    store.upsert("session-a", original)
    store.claim_unseen({9})

    store.upsert("session-a", replacement)
    delivery = store.claim_unseen({9})
    store.delete_session("session-a")

    assert delivery[0].subscription == replacement
    assert delivery[0].thread_ids == (9,)
    assert store.claim_unseen({10}) == []


@pytest.mark.anyio
async def test_dispatch_sends_one_privacy_safe_deep_link_per_new_thread(tmp_path):
    store = PushSubscriptionStore(tmp_path / "push.sqlite3")
    store.upsert("session-a", {
        "endpoint": "https://push.example/device-a",
        "keys": {"p256dh": "public-key", "auth": "auth-secret"},
    })
    sent = []

    async def unread():
        return {"items": [
            {"id": 42, "repository": "private/repo", "title": "Secret title"},
        ]}

    async def send(subscription, payload):
        sent.append((subscription, json.loads(payload)))

    config = PushConfiguration("public-vapid", "private-vapid", "mailto:ops@example.com")
    assert await dispatch_unread_updates(store, config, unread, send) == 1
    assert await dispatch_unread_updates(store, config, unread, send) == 0
    assert sent[0][1] == {
        "title": "New work update",
        "body": "Tap to review it in Stackchain.",
        "route": "#/my-work/update/42",
        "tag": "stackchain-update-42",
        "notification_id": 42,
    }
    assert "private/repo" not in json.dumps(sent)
    assert "Secret title" not in json.dumps(sent)


@pytest.mark.anyio
async def test_production_notification_page_dispatches_one_unread_push(tmp_path):
    def upstream(_request):
        return httpx.Response(200, json=[{
            "id": 42,
            "unread": True,
            "repository": {"full_name": "private/repo"},
            "subject": {
                "title": "Secret title",
                "type": "Issue",
                "html_url": "https://forge.example/private/repo/issues/7",
            },
        }])

    gitea_proxy.start_client(transport=httpx.MockTransport(upstream))
    try:
        page = await gitea_proxy.notification_page(1)
    finally:
        await gitea_proxy.stop_client()

    store = PushSubscriptionStore(tmp_path / "push.sqlite3")
    store.upsert("session-a", {
        "endpoint": "https://push.example/device-a",
        "keys": {"p256dh": "public-key", "auth": "auth-secret"},
    })
    sent = []

    async def unread():
        return page

    async def send(_subscription, payload):
        sent.append(json.loads(payload))

    config = PushConfiguration("public", "private", "mailto:ops@example.com")
    assert await dispatch_unread_updates(store, config, unread, send) == 1
    assert sent == [{
        "title": "New work update",
        "body": "Tap to review it in Stackchain.",
        "route": "#/my-work/update/42",
        "tag": "stackchain-update-42",
        "notification_id": 42,
    }]
    assert "private/repo" not in json.dumps(sent)
    assert "Secret title" not in json.dumps(sent)


@pytest.mark.anyio
async def test_concurrent_workers_do_not_dispatch_the_same_update(tmp_path):
    path = tmp_path / "push.sqlite3"
    first = PushSubscriptionStore(path)
    second = PushSubscriptionStore(path)
    first.upsert("session-a", {
        "endpoint": "https://push.example/device-a",
        "keys": {"p256dh": "public-key", "auth": "auth-secret"},
    })
    sending = asyncio.Event()
    finish = asyncio.Event()
    sent = []

    async def unread():
        return {"items": [{"id": 42}]}

    async def send(_subscription, payload):
        sent.append(json.loads(payload)["tag"])
        sending.set()
        await finish.wait()

    config = PushConfiguration("public", "private", "mailto:ops@example.com")
    active = asyncio.create_task(dispatch_unread_updates(first, config, unread, send))
    await sending.wait()
    competing = await asyncio.wait_for(
        dispatch_unread_updates(second, config, unread, send), timeout=0.1
    )
    finish.set()

    assert competing == 0
    assert await active == 1
    assert sent == ["stackchain-update-42"]


@pytest.mark.anyio
async def test_dispatch_removes_an_expired_push_endpoint(tmp_path):
    store = PushSubscriptionStore(tmp_path / "push.sqlite3")
    store.upsert("session-a", {
        "endpoint": "https://push.example/expired",
        "keys": {"p256dh": "public-key", "auth": "auth-secret"},
    })

    class Expired(Exception):
        response = SimpleNamespace(status_code=410)

    async def unread():
        return {"items": [{"id": 8}]}

    async def send(_subscription, _payload):
        raise Expired()

    config = PushConfiguration("public", "private", "mailto:ops@example.com")
    assert await dispatch_unread_updates(store, config, unread, send) == 0
    assert store.is_subscribed("session-a") is False


@pytest.mark.anyio
async def test_transient_endpoint_failure_does_not_block_healthy_devices(tmp_path):
    store = PushSubscriptionStore(tmp_path / "push.sqlite3")
    for session_id in ("session-a", "session-b"):
        store.upsert(session_id, {
            "endpoint": f"https://push.example/{session_id}",
            "keys": {"p256dh": "public-key", "auth": "auth-secret"},
        })
    sent = []

    async def unread():
        return {"items": [{"id": 8}]}

    async def send(subscription, _payload):
        if subscription["endpoint"].endswith("session-a"):
            raise RuntimeError("provider unavailable")
        sent.append(subscription["endpoint"])

    config = PushConfiguration("public", "private", "mailto:ops@example.com")
    assert await dispatch_unread_updates(store, config, unread, send) == 1
    assert sent == ["https://push.example/session-b"]
    assert store.claim_unseen({8})[0].session_id == "session-a"


@pytest.mark.anyio
async def test_transient_failure_stops_that_device_until_the_next_poll(tmp_path):
    store = PushSubscriptionStore(tmp_path / "push.sqlite3")
    for session_id in ("failing-device", "healthy-device"):
        store.upsert(session_id, {
            "endpoint": f"https://push.example/{session_id}",
            "keys": {"p256dh": "public-key", "auth": "auth-secret"},
        })
    attempts = []

    async def unread():
        return {"items": [
            {"id": 8},
            {"id": 9},
        ]}

    async def send(subscription, payload):
        endpoint = subscription["endpoint"]
        thread_id = int(json.loads(payload)["route"].rsplit("/", 1)[1])
        attempts.append((endpoint, thread_id))
        if endpoint.endswith("failing-device"):
            raise RuntimeError("provider unavailable")

    config = PushConfiguration("public", "private", "mailto:ops@example.com")
    assert await dispatch_unread_updates(store, config, unread, send) == 2
    assert [item for item in attempts if item[0].endswith("failing-device")] == [
        ("https://push.example/failing-device", 8)
    ]
    remaining = {item.session_id: item.thread_ids for item in store.claim_unseen({8, 9})}
    assert remaining == {"failing-device": (8, 9)}


@pytest.mark.anyio
async def test_timed_out_endpoint_does_not_stall_push_fanout(tmp_path):
    store = PushSubscriptionStore(tmp_path / "push.sqlite3")
    for session_id in ("session-a", "session-b"):
        store.upsert(session_id, {
            "endpoint": f"https://push.example/{session_id}",
            "keys": {"p256dh": "public-key", "auth": "auth-secret"},
        })
    sent = []

    async def unread():
        return {"items": [{"id": 13}]}

    async def send(subscription, _payload):
        if subscription["endpoint"].endswith("session-a"):
            await asyncio.Event().wait()
        sent.append(subscription["endpoint"])

    config = PushConfiguration("public", "private", "mailto:ops@example.com")
    delivered = await asyncio.wait_for(
        dispatch_unread_updates(
            store, config, unread, send, send_timeout_seconds=0.01
        ),
        timeout=0.2,
    )

    assert delivered == 1
    assert sent == ["https://push.example/session-b"]


@pytest.mark.anyio
async def test_dispatches_devices_concurrently_with_a_strict_bound(tmp_path):
    store = PushSubscriptionStore(tmp_path / "push.sqlite3")
    for index in range(4):
        store.upsert(f"session-{index}", {
            "endpoint": f"https://push.example/session-{index}",
            "keys": {"p256dh": "public-key", "auth": "auth-secret"},
        })
    active = 0
    peak = 0
    bound_reached = asyncio.Event()
    release = asyncio.Event()

    async def unread():
        return {"items": [{"id": 13}]}

    async def send(_subscription, _payload):
        nonlocal active, peak
        active += 1
        peak = max(peak, active)
        if active == 2:
            bound_reached.set()
        await release.wait()
        active -= 1

    config = PushConfiguration("public", "private", "mailto:ops@example.com")
    dispatch = asyncio.create_task(dispatch_unread_updates(
        store, config, unread, send, max_concurrency=2
    ))
    await asyncio.wait_for(bound_reached.wait(), timeout=0.2)

    assert peak == 2
    assert dispatch.done() is False

    release.set()
    assert await dispatch == 4
    assert peak == 2


@pytest.mark.anyio
async def test_dispatch_removes_inactive_sessions_without_blocking_active_devices(tmp_path):
    store = PushSubscriptionStore(tmp_path / "push.sqlite3")
    for session_id in ("expired-device", "active-device"):
        store.upsert(session_id, {
            "endpoint": f"https://push.example/{session_id}",
            "keys": {"p256dh": "public-key", "auth": "auth-secret"},
        })
    sent = []

    async def unread():
        return {"items": [{"id": 21}]}

    async def session_active(management_id):
        return management_id == "active-device"

    async def send(subscription, _payload):
        sent.append(subscription["endpoint"])

    config = PushConfiguration("public", "private", "mailto:ops@example.com")
    assert await dispatch_unread_updates(
        store, config, unread, send, session_active=session_active
    ) == 1
    assert store.is_subscribed("expired-device") is False
    assert store.is_subscribed("active-device") is True
    assert sent == ["https://push.example/active-device"]


@pytest.mark.anyio
async def test_dispatch_fails_closed_and_retains_subscriptions_when_session_registry_fails(tmp_path):
    store = PushSubscriptionStore(tmp_path / "push.sqlite3")
    store.upsert("active-device", {
        "endpoint": "https://push.example/active-device",
        "keys": {"p256dh": "public-key", "auth": "auth-secret"},
    })
    sent = []

    async def unread():
        return {"items": [{"id": 22}]}

    async def registry_unavailable(_management_id):
        raise RuntimeError("session registry unavailable")

    async def send(subscription, _payload):
        sent.append(subscription)

    config = PushConfiguration("public", "private", "mailto:ops@example.com")
    assert await dispatch_unread_updates(
        store, config, unread, send, session_active=registry_unavailable
    ) == 0
    assert store.is_subscribed("active-device") is True
    assert sent == []


@pytest.mark.anyio
async def test_authenticated_device_can_subscribe_report_status_and_unsubscribe(tmp_path, monkeypatch):
    store = PushSubscriptionStore(tmp_path / "push.sqlite3")
    monkeypatch.setattr(main, "_push_subscription_store", store)
    monkeypatch.setattr(
        main,
        "_push_configuration",
        lambda: PushConfiguration("public-vapid", "private-vapid", "mailto:ops@example.com"),
    )
    async def management_id(_session):
        return "session-a"

    monkeypatch.setattr(main.dashboard_auth, "session_management_id", management_id)

    async def no_unread():
        return {"items": []}

    monkeypatch.setattr(main, "notifications", no_unread)
    request = SimpleNamespace(state=SimpleNamespace(
        dashboard_session=SimpleNamespace(session_id="session-a")
    ))
    payload = main.PushSubscriptionPayload(
        endpoint="https://push.example/device-a",
        keys={"p256dh": "public-key", "auth": "auth-secret"},
    )

    assert await main.push_status(request) == {
        "available": True, "subscribed": False, "public_key": "public-vapid"
    }
    assert await main.subscribe_push(payload, request) == {"subscribed": True}
    assert (await main.push_status(request))["subscribed"] is True
    assert await main.unsubscribe_push(request) == {"subscribed": False}
    assert (await main.push_status(request))["subscribed"] is False


@pytest.mark.anyio
async def test_subscription_baselines_production_notification_ids(tmp_path, monkeypatch):
    store = PushSubscriptionStore(tmp_path / "push.sqlite3")
    monkeypatch.setattr(main, "_push_subscription_store", store)
    monkeypatch.setattr(
        main,
        "_push_configuration",
        lambda: PushConfiguration("public", "private", "mailto:ops@example.com"),
    )

    async def management_id(_session):
        return "device-a"

    async def current_unread():
        return {"items": [{"id": 42}]}

    monkeypatch.setattr(main.dashboard_auth, "session_management_id", management_id)
    monkeypatch.setattr(main, "notifications", current_unread)
    request = SimpleNamespace(state=SimpleNamespace(dashboard_session=object()))
    payload = main.PushSubscriptionPayload(
        endpoint="https://push.example/device-a",
        keys={"p256dh": "public-key", "auth": "auth-secret"},
    )

    assert await main.subscribe_push(payload, request) == {"subscribed": True}
    assert store.claim_unseen({42}) == []
    assert store.claim_unseen({42, 43})[0].thread_ids == (43,)


@pytest.mark.anyio
async def test_subscription_fails_closed_when_existing_unread_baseline_is_unavailable(tmp_path, monkeypatch):
    store = PushSubscriptionStore(tmp_path / "push.sqlite3")
    monkeypatch.setattr(main, "_push_subscription_store", store)
    monkeypatch.setattr(
        main, "_push_configuration",
        lambda: PushConfiguration("public", "private", "mailto:ops@example.com"),
    )

    async def management_id(_session):
        return "device-a"

    async def unavailable():
        raise RuntimeError("Gitea unavailable")

    monkeypatch.setattr(main.dashboard_auth, "session_management_id", management_id)
    monkeypatch.setattr(main, "notifications", unavailable)
    request = SimpleNamespace(state=SimpleNamespace(dashboard_session=object()))
    payload = main.PushSubscriptionPayload(
        endpoint="https://push.example/device-a",
        keys={"p256dh": "public-key", "auth": "auth-secret"},
    )

    with pytest.raises(main.HTTPException) as raised:
        await main.subscribe_push(payload, request)

    assert raised.value.status_code == 503
    assert store.is_subscribed("device-a") is False