from __future__ import annotations

from datetime import datetime, timezone
from typing import Any, cast
from unittest.mock import AsyncMock, MagicMock
from uuid import UUID, uuid4

import pytest
from sqlalchemy.exc import SQLAlchemyError

from core.http.errors import ApiProblemError
from core.auth.models import CurrentUser
from models.inbox_messages import InboxMessage, InboxMessageType
from models.schedule_items import ScheduleItem
from schemas.enums import FriendshipStatus
from v1.auth.schemas import UserByPhoneResponse
from v1.schedule_items.repository import ScheduleItemRepository
from v1.schedule_items.schemas import ScheduleItemShareRequest
from v1.schedule_items.service import ScheduleItemService


def test_share_request_schema() -> None:
    request = ScheduleItemShareRequest(
        phone="+8613810000000",
        permission_view=True,
        permission_edit=True,
        permission_invite=False,
    )
    assert request.phone == "+8613810000000"
    assert request.permission_view is True


def test_permission_bits_calculation() -> None:
    request = ScheduleItemShareRequest(
        phone="+8613810000000",
        permission_view=True,
        permission_edit=True,
        permission_invite=False,
    )
    assert request._permission_value() == 5


def _build_item(item_id: UUID, owner_id: UUID) -> ScheduleItem:
    item = MagicMock(spec=ScheduleItem)
    item.id = item_id
    item.owner_id = owner_id
    item.title = "test"
    item.description = None
    item.start_at = datetime(2026, 2, 28, 16, 0, 0, tzinfo=timezone.utc)
    item.end_at = None
    item.timezone = "UTC"
    item.extra_metadata = {}
    item.created_at = datetime(2026, 2, 28, 10, 0, 0, tzinfo=timezone.utc)
    item.updated_at = datetime(2026, 2, 28, 10, 0, 0, tzinfo=timezone.utc)
    return item


class ShareRepo:
    def __init__(self, item: ScheduleItem | None) -> None:
        self._item = item

    async def get_by_id(self, item_id: UUID) -> ScheduleItem | None:
        if self._item and self._item.id == item_id:
            return self._item
        return None

    async def get_subscription(self, item_id: UUID, subscriber_id: UUID) -> None:
        return None

    async def create_subscription(self, data: dict[str, object]) -> None:
        return None


class AuthGatewayStub:
    async def get_user_by_phone(self, phone: str) -> UserByPhoneResponse:
        return UserByPhoneResponse(
            id="00000000-0000-0000-0000-000000000222",
            phone=phone,
            created_at="2026-02-28T10:00:00Z",
            phone_confirmed_at=None,
        )

    async def get_user_by_id(self, user_id: str) -> UserByPhoneResponse:
        return UserByPhoneResponse(
            id=user_id,
            phone="+8613810000000",
            created_at="2026-02-28T10:00:00Z",
            phone_confirmed_at=None,
        )


class InboxRepoStub:
    async def create(self, data: dict[str, object]) -> InboxMessage:
        return InboxMessage(
            id=uuid4(),
            recipient_id=UUID("00000000-0000-0000-0000-000000000222"),
            sender_id=UUID("00000000-0000-0000-0000-000000000001"),
            message_type=InboxMessageType.CALENDAR,
            schedule_item_id=uuid4(),
            content='{"type": "invite", "permission": 1, "action": "pending"}',
            created_by=UUID("00000000-0000-0000-0000-000000000001"),
        )

    async def get_by_id(
        self, message_id: UUID, recipient_id: UUID
    ) -> InboxMessage | None:
        return None

    async def list_by_recipient(
        self, recipient_id: UUID, is_read: bool | None = None
    ) -> list[InboxMessage]:
        return []

    async def mark_as_read(
        self, message_id: UUID, recipient_id: UUID
    ) -> InboxMessage | None:
        return None

    async def get_pending_calendar_invite(
        self, schedule_item_id: UUID, recipient_id: UUID
    ) -> InboxMessage | None:
        return None

    async def get_calendar_invite(
        self, schedule_item_id: UUID, recipient_id: UUID
    ) -> InboxMessage | None:
        return None


class AuthGatewayInvalidIdStub:
    async def get_user_by_phone(self, phone: str) -> UserByPhoneResponse:
        return UserByPhoneResponse(
            id="not-a-uuid",
            phone=phone,
            created_at="2026-02-28T10:00:00Z",
            phone_confirmed_at=None,
        )

    async def get_user_by_id(self, user_id: str) -> UserByPhoneResponse:
        return UserByPhoneResponse(
            id=user_id,
            phone="+8613810000000",
            created_at="2026-02-28T10:00:00Z",
            phone_confirmed_at=None,
        )


class FriendshipRepoStub:
    def __init__(self, accepted: bool = True) -> None:
        self._accepted = accepted

    async def get_friendship_between_users(self, user_id_1: UUID, user_id_2: UUID):
        if not self._accepted:
            return None
        friendship = MagicMock()
        friendship.status = FriendshipStatus.ACCEPTED
        return friendship


@pytest.mark.asyncio
async def test_share_forbidden_when_not_owner() -> None:
    owner_id = UUID("00000000-0000-0000-0000-000000000001")
    requester_id = UUID("00000000-0000-0000-0000-000000000002")
    item_id = uuid4()
    service = ScheduleItemService(
        repository=cast(
            ScheduleItemRepository,
            ShareRepo(_build_item(item_id=item_id, owner_id=owner_id)),
        ),
        session=AsyncMock(),
        current_user=CurrentUser(id=requester_id),
        auth_gateway=cast(Any, AuthGatewayStub()),
        inbox_repository=InboxRepoStub(),
        friendship_repository=cast(Any, FriendshipRepoStub()),
    )

    with pytest.raises(ApiProblemError) as exc_info:
        await service.share(
            item_id,
            ScheduleItemShareRequest(
                phone="+8613810000000",
                permission_view=True,
                permission_edit=False,
                permission_invite=False,
            ),
        )

    assert exc_info.value.status_code == 403


@pytest.mark.asyncio
async def test_share_success_creates_calendar_invitation_message() -> None:
    owner_id = UUID("00000000-0000-0000-0000-000000000001")
    item_id = uuid4()
    session = AsyncMock()
    session.add = MagicMock()
    service = ScheduleItemService(
        repository=cast(
            ScheduleItemRepository,
            ShareRepo(_build_item(item_id=item_id, owner_id=owner_id)),
        ),
        session=session,
        current_user=CurrentUser(id=owner_id),
        auth_gateway=cast(Any, AuthGatewayStub()),
        inbox_repository=InboxRepoStub(),
        friendship_repository=cast(Any, FriendshipRepoStub()),
    )

    result = await service.share(
        item_id,
        ScheduleItemShareRequest(
            phone="+8613810000000",
            permission_view=True,
            permission_edit=True,
            permission_invite=False,
        ),
    )

    assert result.message == "Calendar invitation sent"
    session.add.assert_called_once()
    message = session.add.call_args.args[0]
    assert isinstance(message, InboxMessage)
    assert message.sender_id == owner_id
    assert message.schedule_item_id == item_id
    assert message.message_type == InboxMessageType.CALENDAR
    assert message.content == {"type": "invite", "permission": 5, "action": "pending"}
    session.commit.assert_awaited_once()


@pytest.mark.asyncio
async def test_share_returns_not_found_when_item_missing() -> None:
    requester_id = UUID("00000000-0000-0000-0000-000000000002")
    service = ScheduleItemService(
        repository=cast(ScheduleItemRepository, ShareRepo(None)),
        session=AsyncMock(),
        current_user=CurrentUser(id=requester_id),
        auth_gateway=cast(Any, AuthGatewayStub()),
        inbox_repository=InboxRepoStub(),
        friendship_repository=cast(Any, FriendshipRepoStub()),
    )

    with pytest.raises(ApiProblemError) as exc_info:
        await service.share(
            uuid4(),
            ScheduleItemShareRequest(
                phone="+8613810000000",
                permission_view=True,
                permission_edit=False,
                permission_invite=False,
            ),
        )

    assert exc_info.value.status_code == 404


@pytest.mark.asyncio
async def test_share_invalid_auth_user_id_returns_503() -> None:
    owner_id = UUID("00000000-0000-0000-0000-000000000001")
    item_id = uuid4()
    session = AsyncMock()
    service = ScheduleItemService(
        repository=cast(
            ScheduleItemRepository,
            ShareRepo(_build_item(item_id=item_id, owner_id=owner_id)),
        ),
        session=session,
        current_user=CurrentUser(id=owner_id),
        auth_gateway=cast(Any, AuthGatewayInvalidIdStub()),
        inbox_repository=InboxRepoStub(),
        friendship_repository=cast(Any, FriendshipRepoStub()),
    )

    with pytest.raises(ApiProblemError) as exc_info:
        await service.share(
            item_id,
            ScheduleItemShareRequest(
                phone="+8613810000000",
                permission_view=True,
                permission_edit=False,
                permission_invite=False,
            ),
        )

    assert exc_info.value.status_code == 503
    assert exc_info.value.detail == "Auth lookup unavailable"
    session.rollback.assert_awaited_once()


@pytest.mark.asyncio
async def test_share_sqlalchemy_error_rolls_back() -> None:
    owner_id = UUID("00000000-0000-0000-0000-000000000001")
    item_id = uuid4()
    session = AsyncMock()
    session.add = MagicMock(side_effect=SQLAlchemyError("db error"))
    service = ScheduleItemService(
        repository=cast(
            ScheduleItemRepository,
            ShareRepo(_build_item(item_id=item_id, owner_id=owner_id)),
        ),
        session=session,
        current_user=CurrentUser(id=owner_id),
        auth_gateway=cast(Any, AuthGatewayStub()),
        inbox_repository=InboxRepoStub(),
        friendship_repository=cast(Any, FriendshipRepoStub()),
    )

    with pytest.raises(ApiProblemError) as exc_info:
        await service.share(
            item_id,
            ScheduleItemShareRequest(
                phone="+8613810000000",
                permission_view=True,
                permission_edit=False,
                permission_invite=False,
            ),
        )

    assert exc_info.value.status_code == 503
    assert exc_info.value.detail == "Schedule item store unavailable"
    session.rollback.assert_awaited_once()


@pytest.mark.asyncio
async def test_share_returns_forbidden_when_target_is_not_friend() -> None:
    owner_id = UUID("00000000-0000-0000-0000-000000000001")
    item_id = uuid4()
    service = ScheduleItemService(
        repository=cast(
            ScheduleItemRepository,
            ShareRepo(_build_item(item_id=item_id, owner_id=owner_id)),
        ),
        session=AsyncMock(),
        current_user=CurrentUser(id=owner_id),
        auth_gateway=cast(Any, AuthGatewayStub()),
        inbox_repository=InboxRepoStub(),
        friendship_repository=cast(Any, FriendshipRepoStub(accepted=False)),
    )

    with pytest.raises(ApiProblemError) as exc_info:
        await service.share(
            item_id,
            ScheduleItemShareRequest(
                phone="+8613810000000",
                permission_view=True,
                permission_edit=False,
                permission_invite=False,
            ),
        )

    assert exc_info.value.status_code == 403
    assert exc_info.value.detail == "You can only share calendar with accepted friends"