from __future__ import annotations

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

import pytest
from fastapi import HTTPException
from sqlalchemy.exc import SQLAlchemyError

from core.auth.models import CurrentUser
from models.inbox_messages import InboxMessage, InboxMessageType
from models.schedule_items import ScheduleItem
from v1.auth.schemas import UserByEmailResponse
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(
        email="friend@example.com",
        permission_view=True,
        permission_edit=True,
        permission_invite=False,
    )
    assert request.email == "friend@example.com"
    assert request.permission_view is True


def test_permission_bits_calculation() -> None:
    request = ScheduleItemShareRequest(
        email="friend@example.com",
        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


class AuthGatewayStub:
    async def get_user_by_email(self, email: str) -> UserByEmailResponse:
        return UserByEmailResponse(
            id="00000000-0000-0000-0000-000000000222",
            email=email,
            created_at="2026-02-28T10:00:00Z",
            email_confirmed_at=None,
        )


class AuthGatewayInvalidIdStub:
    async def get_user_by_email(self, email: str) -> UserByEmailResponse:
        return UserByEmailResponse(
            id="not-a-uuid",
            email=email,
            created_at="2026-02-28T10:00:00Z",
            email_confirmed_at=None,
        )


@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=AuthGatewayStub(),
    )

    with pytest.raises(HTTPException) as exc_info:
        await service.share(
            item_id,
            ScheduleItemShareRequest(
                email="friend@example.com",
                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=AuthGatewayStub(),
    )

    result = await service.share(
        item_id,
        ScheduleItemShareRequest(
            email="friend@example.com",
            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 == '{"permission": 5}'
    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=AuthGatewayStub(),
    )

    with pytest.raises(HTTPException) as exc_info:
        await service.share(
            uuid4(),
            ScheduleItemShareRequest(
                email="friend@example.com",
                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=AuthGatewayInvalidIdStub(),
    )

    with pytest.raises(HTTPException) as exc_info:
        await service.share(
            item_id,
            ScheduleItemShareRequest(
                email="friend@example.com",
                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=AuthGatewayStub(),
    )

    with pytest.raises(HTTPException) as exc_info:
        await service.share(
            item_id,
            ScheduleItemShareRequest(
                email="friend@example.com",
                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()