from datetime import datetime, timedelta

import pytest

from banban.dao.binding import BIND_MODE_CARD, BIND_MODE_DEVICE, SESSION_STATUS_COMPLETED, SESSION_STATUS_EXPIRED
from banban.service.binding import BindingError, BindingService


class FakeSession:
    def __init__(self):
        self.commits = 0
        self.rollbacks = 0
        self.closed = False

    async def commit(self):
        self.commits += 1

    async def rollback(self):
        self.rollbacks += 1

    async def close(self):
        self.closed = True


@pytest.mark.asyncio
async def test_start_card_bind_requires_existing_authorized_binding_and_sends_nfc_command(monkeypatch):
    service = BindingService()
    db_session = FakeSession()
    started_binds = []
    sent_commands = []

    async def fake_get_session():
        return db_session

    async def fake_get_by_device(self, device_id, user_id):
        assert device_id == "TalkingQ_device001"
        assert user_id == 99
        return {
            "device_id": "TalkingQ_device001",
            "child_id": 7,
            "owner_user_id": 99,
        }

    async def fake_start_bind(self, user_id, device_id, child_id, bind_mode):
        started_binds.append((user_id, device_id, child_id, bind_mode))
        return "bind-token-card", datetime.utcnow() + timedelta(minutes=10)

    async def fake_send_bind_nfc_command(device_id):
        sent_commands.append(device_id)

    monkeypatch.setattr(service, "get_session", fake_get_session)
    monkeypatch.setattr("banban.service.binding.BindingDAO.get_by_device", fake_get_by_device)
    monkeypatch.setattr("banban.service.binding.BindingDAO.start_bind", fake_start_bind)
    monkeypatch.setattr(service, "_send_bind_nfc_command", fake_send_bind_nfc_command)

    bind_token, expires_at = await service.start_card_bind(user_id=99, device_id="TalkingQ_device001")

    assert bind_token == "bind-token-card"
    assert expires_at > datetime.utcnow()
    assert started_binds == [(99, "TalkingQ_device001", 7, BIND_MODE_CARD)]
    assert sent_commands == ["TalkingQ_device001"]
    assert db_session.commits == 1
    assert db_session.closed is True


@pytest.mark.asyncio
async def test_start_card_bind_rejects_family_member_who_is_not_owner(monkeypatch):
    service = BindingService()
    db_session = FakeSession()
    started_binds = []

    async def fake_get_session():
        return db_session

    async def fake_get_by_device(self, device_id, user_id):
        assert device_id == "TalkingQ_device001"
        assert user_id == 88
        return {
            "device_id": "TalkingQ_device001",
            "child_id": 7,
            "owner_user_id": 99,
        }

    async def fake_start_bind(self, *args, **kwargs):
        started_binds.append((args, kwargs))

    monkeypatch.setattr(service, "get_session", fake_get_session)
    monkeypatch.setattr("banban.service.binding.BindingDAO.get_by_device", fake_get_by_device)
    monkeypatch.setattr("banban.service.binding.BindingDAO.start_bind", fake_start_bind)

    with pytest.raises(BindingError, match="only the device owner can add cards"):
        await service.start_card_bind(user_id=88, device_id="TalkingQ_device001")

    assert started_binds == []
    assert db_session.commits == 0
    assert db_session.closed is True


@pytest.mark.asyncio
async def test_finalize_nfc_bind_expires_late_card_without_binding(monkeypatch):
    service = BindingService()
    db_session = FakeSession()
    expired_session = {
        "id": 42,
        "bind_token": "bind-token-expired",
        "device_id": "TalkingQ_device001",
        "target_child_id": 7,
        "initiator_user_id": 99,
        "expires_at": datetime.utcnow() - timedelta(seconds=1),
    }
    marked_statuses = []
    activated_cards = []
    completed_sessions = []

    async def fake_get_session():
        return db_session

    async def fake_get_latest_pending_session_by_device(self, device_id):
        assert device_id == "TalkingQ_device001"
        return expired_session

    async def fake_mark_session_status(self, session_id, status):
        marked_statuses.append((session_id, status))

    async def fake_activate_card(**kwargs):
        activated_cards.append(kwargs)

    async def fake_complete_nfc_bind(self, **kwargs):
        completed_sessions.append(kwargs)

    monkeypatch.setattr(service, "get_session", fake_get_session)
    monkeypatch.setattr(
        "banban.service.binding.BindingDAO.get_latest_pending_session_by_device",
        fake_get_latest_pending_session_by_device,
    )
    monkeypatch.setattr("banban.service.binding.BindingDAO.mark_session_status", fake_mark_session_status)
    monkeypatch.setattr("banban.service.binding.card_service.activate_card", fake_activate_card)
    monkeypatch.setattr("banban.service.binding.BindingDAO.complete_nfc_bind", fake_complete_nfc_bind)

    result = await service.finalize_nfc_bind(
        device_id="TalkingQ_device001",
        card_uuid="CARD_UUID_LATE",
    )

    assert result == {
        "device_id": "TalkingQ_device001",
        "bind_token": "bind-token-expired",
        "status": SESSION_STATUS_EXPIRED,
    }
    assert marked_statuses == [(42, SESSION_STATUS_EXPIRED)]
    assert activated_cards == []
    assert completed_sessions == []
    assert db_session.commits == 1
    assert db_session.rollbacks == 0
    assert db_session.closed is True


@pytest.mark.asyncio
async def test_finalize_nfc_bind_completes_before_expiry(monkeypatch):
    service = BindingService()
    db_session = FakeSession()
    pending_session = {
        "id": 43,
        "bind_token": "bind-token-active",
        "device_id": "TalkingQ_device001",
        "target_child_id": 7,
        "initiator_user_id": 99,
        "expires_at": datetime.utcnow() + timedelta(minutes=10),
        "bind_mode": BIND_MODE_DEVICE,
    }
    marked_statuses = []
    activated_cards = []
    completed_sessions = []

    async def fake_get_session():
        return db_session

    async def fake_get_latest_pending_session_by_device(self, device_id):
        assert device_id == "TalkingQ_device001"
        return pending_session

    async def fake_mark_session_status(self, session_id, status):
        marked_statuses.append((session_id, status))

    async def fake_activate_card(**kwargs):
        activated_cards.append(kwargs)

        class FakeCard:
            card_uuid = kwargs["card_uuid"]

        return FakeCard()

    async def fake_complete_nfc_bind(self, **kwargs):
        completed_sessions.append(kwargs)

    monkeypatch.setattr(service, "get_session", fake_get_session)
    monkeypatch.setattr(
        "banban.service.binding.BindingDAO.get_latest_pending_session_by_device",
        fake_get_latest_pending_session_by_device,
    )
    monkeypatch.setattr("banban.service.binding.BindingDAO.mark_session_status", fake_mark_session_status)
    monkeypatch.setattr("banban.service.binding.card_service.activate_card", fake_activate_card)
    monkeypatch.setattr("banban.service.binding.BindingDAO.complete_nfc_bind", fake_complete_nfc_bind)

    result = await service.finalize_nfc_bind(
        device_id="TalkingQ_device001",
        card_uuid="CARD_UUID_ON_TIME",
    )

    assert result == {
        "device_id": "TalkingQ_device001",
        "bind_token": "bind-token-active",
        "status": SESSION_STATUS_COMPLETED,
        "child_id": 7,
        "card_uuid": "CARD_UUID_ON_TIME",
    }
    assert marked_statuses == []
    assert activated_cards == [
        {
            "card_uuid": "CARD_UUID_ON_TIME",
            "device_id": "TalkingQ_device001",
            "db_session": db_session,
        }
    ]
    assert completed_sessions == [
        {
            "session_id": 43,
            "device_id": "TalkingQ_device001",
            "child_id": 7,
            "user_id": 99,
            "card_uuid": "CARD_UUID_ON_TIME",
        }
    ]
    assert db_session.commits == 1
    assert db_session.rollbacks == 0
    assert db_session.closed is True


@pytest.mark.asyncio
async def test_finalize_nfc_bind_adds_card_without_rebinding_device(monkeypatch):
    service = BindingService()
    db_session = FakeSession()
    pending_session = {
        "id": 44,
        "bind_token": "bind-token-card",
        "device_id": "TalkingQ_device001",
        "target_child_id": 7,
        "initiator_user_id": 99,
        "expires_at": datetime.utcnow() + timedelta(minutes=10),
        "bind_mode": BIND_MODE_CARD,
    }
    activated_cards = []
    completed_card_sessions = []
    completed_device_sessions = []

    async def fake_get_session():
        return db_session

    async def fake_get_latest_pending_session_by_device(self, device_id):
        assert device_id == "TalkingQ_device001"
        return pending_session

    async def fake_mark_session_status(self, session_id, status):
        raise AssertionError(f"unexpected status mark: {session_id}, {status}")

    async def fake_activate_card(**kwargs):
        activated_cards.append(kwargs)

        class FakeCard:
            card_uuid = kwargs["card_uuid"]

        return FakeCard()

    async def fake_complete_card_bind(self, **kwargs):
        completed_card_sessions.append(kwargs)

    async def fake_complete_nfc_bind(self, **kwargs):
        completed_device_sessions.append(kwargs)

    monkeypatch.setattr(service, "get_session", fake_get_session)
    monkeypatch.setattr(
        "banban.service.binding.BindingDAO.get_latest_pending_session_by_device",
        fake_get_latest_pending_session_by_device,
    )
    monkeypatch.setattr("banban.service.binding.BindingDAO.mark_session_status", fake_mark_session_status)
    monkeypatch.setattr("banban.service.binding.card_service.activate_card", fake_activate_card)
    monkeypatch.setattr("banban.service.binding.BindingDAO.complete_card_bind", fake_complete_card_bind)
    monkeypatch.setattr("banban.service.binding.BindingDAO.complete_nfc_bind", fake_complete_nfc_bind)

    result = await service.finalize_nfc_bind(
        device_id="TalkingQ_device001",
        card_uuid="CARD_UUID_EXTRA",
    )

    assert result == {
        "device_id": "TalkingQ_device001",
        "bind_token": "bind-token-card",
        "status": SESSION_STATUS_COMPLETED,
        "child_id": 7,
        "card_uuid": "CARD_UUID_EXTRA",
    }
    assert activated_cards == [
        {
            "card_uuid": "CARD_UUID_EXTRA",
            "device_id": "TalkingQ_device001",
            "db_session": db_session,
        }
    ]
    assert completed_card_sessions == [{"session_id": 44, "card_uuid": "CARD_UUID_EXTRA"}]
    assert completed_device_sessions == []
    assert db_session.commits == 1
    assert db_session.rollbacks == 0
    assert db_session.closed is True