"""Tests for `ManualFetchService` (backend/app/services/fetch_data_service.py).

This is the manual-entry path a parent's Försäkringskassan balances enter the
app through — now the primary onboarding action. The service is a thin
wrapper over the shared `app.services.leave_snapshot.build_snapshot`
derivation (also used by the FK scraper), plus the "default `total_days` off
the workspace's parent count" behaviour that is unique to manual entry (a
scraped snapshot always carries FK's own total).

`test_leave_snapshot.py` covers `build_snapshot`'s own derivation/validation
exhaustively; this file only proves the wrapper forwards correctly and gets
the parent-count default right, plus basic persistence round-trips.
"""

from datetime import datetime
from unittest.mock import AsyncMock
from uuid import uuid4

import pytest

from app.entities.personal_data import PersonalData
from app.repositories_impl.sqlite.parental_leave_repository import SQLiteParentalLeaveRepository
from app.repositories_impl.sqlite.personal_data_repository import SQLitePersonalDataRepository
from app.services.fetch_data_service import ManualFetchService, persist_partner_deduction
from app.utils.errors import ValidationError
from tests.conftest import SeededIds


def _valid_kwargs(seeded_ids: SeededIds, **overrides: object) -> dict:
    base: dict[str, object] = dict(
        personal_data_uuid=seeded_ids.personal_data_uuid,
        workspace_id=seeded_ids.workspace_id,
        child_id=seeded_ids.child_id,
        total_days=480,
        sjukpenning_left=310,
        lagsta_niva_left=70,
        dubbeldagar_left=60,
        reserved_days_left=90,
    )
    base.update(overrides)
    return base


@pytest.fixture
def manual_fetch_service(
    parental_leave_repo: SQLiteParentalLeaveRepository,
    personal_data_repo: SQLitePersonalDataRepository,
) -> ManualFetchService:
    return ManualFetchService(parental_leave_repo, personal_data_repo)


class TestSaveManualEntryValidation:
    async def test_sjukpenning_left_exceeding_total_is_rejected(
        self,
        manual_fetch_service: ManualFetchService,
        seeded_ids: SeededIds,
    ) -> None:
        kwargs = _valid_kwargs(
            seeded_ids,
            total_days=240,
            sjukpenning_left=196,
            lagsta_niva_left=0,
            reserved_days_left=0,
        )
        with pytest.raises(ValidationError, match="sjukpenning_left"):
            await manual_fetch_service.save_manual_entry(**kwargs)

    async def test_sjukpenning_left_equal_to_total_is_accepted(
        self,
        manual_fetch_service: ManualFetchService,
        seeded_ids: SeededIds,
    ) -> None:
        """The boundary itself (that tier fully unused) is valid, not an off-by-one reject."""
        kwargs = _valid_kwargs(
            seeded_ids,
            total_days=240,
            sjukpenning_left=195,
            lagsta_niva_left=45,
            reserved_days_left=90,
        )
        fetch = await manual_fetch_service.save_manual_entry(**kwargs)
        assert fetch.days_left == 240

    async def test_reserved_days_left_exceeding_total_is_rejected(
        self,
        manual_fetch_service: ManualFetchService,
        seeded_ids: SeededIds,
    ) -> None:
        kwargs = _valid_kwargs(seeded_ids, reserved_days_left=91)
        with pytest.raises(ValidationError, match="reserved_days_left"):
            await manual_fetch_service.save_manual_entry(**kwargs)

    async def test_reserved_days_left_equal_to_total_is_accepted(
        self,
        manual_fetch_service: ManualFetchService,
        seeded_ids: SeededIds,
    ) -> None:
        kwargs = _valid_kwargs(seeded_ids, reserved_days_left=90)
        fetch = await manual_fetch_service.save_manual_entry(**kwargs)
        assert fetch.reserved_days_left == 90

    async def test_valid_payload_is_accepted_and_derived_fields_are_correct(
        self,
        manual_fetch_service: ManualFetchService,
        seeded_ids: SeededIds,
    ) -> None:
        kwargs = _valid_kwargs(
            seeded_ids,
            total_days=480,
            sjukpenning_left=310,
            lagsta_niva_left=70,
        )
        fetch = await manual_fetch_service.save_manual_entry(**kwargs)

        assert fetch.source == "manual"
        assert fetch.days_left == 380
        assert fetch.tier_data.sjukpenning_left == 310
        assert fetch.tier_data.lagsta_niva_left == 70
        assert fetch.id is not None
        assert fetch.created_at is not None
        assert fetch.updated_at is not None

    async def test_deduced_source_round_trips(
        self,
        manual_fetch_service: ManualFetchService,
        seeded_ids: SeededIds,
    ) -> None:
        kwargs = _valid_kwargs(seeded_ids, source="deduced")
        fetch = await manual_fetch_service.save_manual_entry(**kwargs)
        assert fetch.source == "deduced"


class TestSaveManualEntryTotalDaysDefault:
    """`total_days` defaults to `rules.total_days_per_child // parent_count`
    when omitted — the whole point of Task 5/§"default pool follows parent
    count" for manual entry.
    """

    async def test_omitted_total_days_defaults_to_full_pool_for_a_sole_parent(
        self,
        manual_fetch_service: ManualFetchService,
        seeded_ids: SeededIds,
    ) -> None:
        """`seeded_ids`'s workspace has exactly one member."""
        kwargs = _valid_kwargs(seeded_ids, sjukpenning_left=390, lagsta_niva_left=90)
        del kwargs["total_days"]
        fetch = await manual_fetch_service.save_manual_entry(**kwargs)
        assert fetch.total_days == 480

    async def test_omitted_total_days_defaults_to_half_pool_with_a_partner(
        self,
        manual_fetch_service: ManualFetchService,
        personal_data_repo: SQLitePersonalDataRepository,
        seeded_ids: SeededIds,
    ) -> None:
        await personal_data_repo.create(
            PersonalData(
                uuid=uuid4(),
                workspace_id=seeded_ids.workspace_id,
                name="Partner",
                created_at=datetime.now(),
            )
        )
        kwargs = _valid_kwargs(seeded_ids, sjukpenning_left=195, lagsta_niva_left=45)
        del kwargs["total_days"]
        fetch = await manual_fetch_service.save_manual_entry(**kwargs)
        assert fetch.total_days == 240

    async def test_omitted_total_days_without_a_personal_data_repo_raises(
        self,
        parental_leave_repo: SQLiteParentalLeaveRepository,
        seeded_ids: SeededIds,
    ) -> None:
        """A `ManualFetchService` built without a `personal_data_repo` (e.g. a
        direct-construction call site that always passes `total_days`
        explicitly) can't resolve the default and must fail loudly rather
        than silently guessing.
        """
        service = ManualFetchService(parental_leave_repo)
        kwargs = _valid_kwargs(seeded_ids)
        del kwargs["total_days"]
        with pytest.raises(ValueError, match="total_days"):
            await service.save_manual_entry(**kwargs)


class TestSaveManualEntryPersistence:
    async def test_snapshot_persists_and_is_readable_via_get_latest(
        self,
        manual_fetch_service: ManualFetchService,
        seeded_ids: SeededIds,
    ) -> None:
        kwargs = _valid_kwargs(seeded_ids)
        saved = await manual_fetch_service.save_manual_entry(**kwargs)

        latest = await manual_fetch_service.get_latest(
            seeded_ids.personal_data_uuid, seeded_ids.child_id
        )
        assert latest is not None
        assert latest.id == saved.id
        assert latest.total_days == saved.total_days
        assert latest.tier_data.sjukpenning_left == saved.tier_data.sjukpenning_left

    async def test_get_latest_with_no_snapshot_returns_none(
        self,
        manual_fetch_service: ManualFetchService,
        seeded_ids: SeededIds,
    ) -> None:
        result = await manual_fetch_service.get_latest(uuid4(), uuid4())
        assert result is None

    async def test_list_history_returns_all_snapshots_newest_first(
        self,
        manual_fetch_service: ManualFetchService,
        seeded_ids: SeededIds,
    ) -> None:
        await manual_fetch_service.save_manual_entry(
            **_valid_kwargs(seeded_ids, dubbeldagar_left=50)
        )
        await manual_fetch_service.save_manual_entry(
            **_valid_kwargs(seeded_ids, dubbeldagar_left=40)
        )
        await manual_fetch_service.save_manual_entry(
            **_valid_kwargs(seeded_ids, dubbeldagar_left=30)
        )

        history = await manual_fetch_service.list_history(
            seeded_ids.personal_data_uuid, seeded_ids.child_id
        )

        assert len(history) == 3
        assert [h.dubbeldagar_left for h in history] == [30, 40, 50]

    async def test_list_history_with_no_snapshots_returns_empty_list(
        self,
        manual_fetch_service: ManualFetchService,
        seeded_ids: SeededIds,
    ) -> None:
        history = await manual_fetch_service.list_history(uuid4(), uuid4())
        assert history == []


class TestPersistPartnerDeduction:
    """`persist_partner_deduction` — called by the FK scraper router's `_persist`
    after `_deduce_partner` produces a `PartnerDeduction` for the family panel.
    """

    async def test_creates_a_deduced_snapshot_for_the_sole_other_member(
        self,
        parental_leave_repo: SQLiteParentalLeaveRepository,
        personal_data_repo: SQLitePersonalDataRepository,
        seeded_ids: SeededIds,
    ) -> None:
        partner = await personal_data_repo.create(
            PersonalData(
                uuid=uuid4(),
                workspace_id=seeded_ids.workspace_id,
                name="Partner",
                created_at=datetime.now(),
            )
        )

        await persist_partner_deduction(
            personal_data_repo=personal_data_repo,
            parental_leave_repo=parental_leave_repo,
            workspace_id=seeded_ids.workspace_id,
            child_id=seeded_ids.child_id,
            caller_personal_data_uuid=seeded_ids.personal_data_uuid,
            total_days=240,
            sjukpenning_left=130,
            lagsta_niva_left=20,
            dubbeldagar_left=20,
        )

        snapshot = await parental_leave_repo.get_latest_by_parent(partner.uuid, seeded_ids.child_id)
        assert snapshot is not None
        assert snapshot.source == "deduced"
        assert snapshot.days_left == 150
        assert snapshot.tier_data.sjukpenning_left == 130
        assert snapshot.tier_data.lagsta_niva_left == 20

    async def test_sole_member_workspace_persists_nothing(
        self,
        parental_leave_repo: SQLiteParentalLeaveRepository,
        personal_data_repo: SQLitePersonalDataRepository,
        seeded_ids: SeededIds,
    ) -> None:
        """`seeded_ids`'s workspace has exactly one member (the caller) — there
        is no "other member" to attribute a deduced snapshot to."""
        await persist_partner_deduction(
            personal_data_repo=personal_data_repo,
            parental_leave_repo=parental_leave_repo,
            workspace_id=seeded_ids.workspace_id,
            child_id=seeded_ids.child_id,
            caller_personal_data_uuid=seeded_ids.personal_data_uuid,
            total_days=240,
            sjukpenning_left=130,
            lagsta_niva_left=20,
            dubbeldagar_left=20,
        )

        history = await parental_leave_repo.list_history(
            seeded_ids.personal_data_uuid, seeded_ids.child_id
        )
        assert history == []

    async def test_more_than_one_other_member_persists_nothing(
        self,
        parental_leave_repo: SQLiteParentalLeaveRepository,
        personal_data_repo: SQLitePersonalDataRepository,
        seeded_ids: SeededIds,
    ) -> None:
        """Ambiguous "which member is the partner" — never guess."""
        for name in ("Partner A", "Partner B"):
            await personal_data_repo.create(
                PersonalData(
                    uuid=uuid4(),
                    workspace_id=seeded_ids.workspace_id,
                    name=name,
                    created_at=datetime.now(),
                )
            )

        await persist_partner_deduction(
            personal_data_repo=personal_data_repo,
            parental_leave_repo=parental_leave_repo,
            workspace_id=seeded_ids.workspace_id,
            child_id=seeded_ids.child_id,
            caller_personal_data_uuid=seeded_ids.personal_data_uuid,
            total_days=240,
            sjukpenning_left=130,
            lagsta_niva_left=20,
            dubbeldagar_left=20,
        )

        history = await parental_leave_repo.list_history(
            seeded_ids.personal_data_uuid, seeded_ids.child_id
        )
        assert history == []

    async def test_repo_failure_is_swallowed_not_raised(
        self,
        personal_data_repo: SQLitePersonalDataRepository,
        seeded_ids: SeededIds,
    ) -> None:
        """The caller's own snapshot is already saved by the time this runs —
        a DB error persisting the partner's snapshot must never fail the
        scraper session."""
        await personal_data_repo.create(
            PersonalData(
                uuid=uuid4(),
                workspace_id=seeded_ids.workspace_id,
                name="Partner",
                created_at=datetime.now(),
            )
        )
        failing_repo = AsyncMock()
        failing_repo.create.side_effect = RuntimeError("DB unavailable")

        await persist_partner_deduction(
            personal_data_repo=personal_data_repo,
            parental_leave_repo=failing_repo,
            workspace_id=seeded_ids.workspace_id,
            child_id=seeded_ids.child_id,
            caller_personal_data_uuid=seeded_ids.personal_data_uuid,
            total_days=240,
            sjukpenning_left=130,
            lagsta_niva_left=20,
            dubbeldagar_left=20,
        )  # must not raise