"""Dependency-injection wiring.

Each factory picks the correct concrete repo based on `settings.database_type`.
Routers/services depend only on the abstract interfaces.

Pattern (copy for each new entity):
  1. `get_<entity>_repository`  — selects sqlite vs postgres impl
  2. `<Entity>RepositoryDep`    — Annotated type alias
  3. `get_<entity>_service`     — wires repo(s) into the service
  4. `<Entity>ServiceDep`       — Annotated type alias
"""

from dataclasses import dataclass
from typing import Annotated
from uuid import UUID

import aiosqlite
from fastapi import Depends, HTTPException, Request, status
from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer

from app.config import settings
from app.entities.child import Child
from app.entities.personal_data import PersonalData
from app.entities.user import User
from app.repositories.child_repository import ChildRepository
from app.repositories.day_assertion_repository import DayAssertionRepository
from app.repositories.day_override_repository import DayOverrideRepository
from app.repositories.leave_wish_repository import LeaveWishRepository
from app.repositories.parental_leave_repository import ParentalLeaveRepository
from app.repositories.personal_data_repository import PersonalDataRepository
from app.repositories.planned_leave_repository import PlannedLeaveRepository
from app.repositories.preschool_planning_days_repository import (
    PreschoolPlanningDaysRepository,
)
from app.repositories.tip_dismissal_repository import TipDismissalRepository
from app.repositories.unit_of_work import UnitOfWork
from app.repositories.user_repository import UserRepository
from app.repositories.vacation_days_repository import VacationDaysRepository
from app.repositories.workspace_repository import (
    WorkspaceInvitationRepository,
    WorkspaceRepository,
)
from app.repositories_impl.sqlite.child_repository import SQLiteChildRepository
from app.repositories_impl.sqlite.day_assertion_repository import SQLiteDayAssertionRepository
from app.repositories_impl.sqlite.day_override_repository import SQLiteDayOverrideRepository
from app.repositories_impl.sqlite.leave_wish_repository import SQLiteLeaveWishRepository
from app.repositories_impl.sqlite.parental_leave_repository import SQLiteParentalLeaveRepository
from app.repositories_impl.sqlite.personal_data_repository import SQLitePersonalDataRepository
from app.repositories_impl.sqlite.planned_leave_repository import SQLitePlannedLeaveRepository
from app.repositories_impl.sqlite.preschool_planning_days_repository import (
    SQLitePreschoolPlanningDaysRepository,
)
from app.repositories_impl.sqlite.tip_dismissal_repository import SQLiteTipDismissalRepository
from app.repositories_impl.sqlite.unit_of_work import SQLiteUnitOfWork
from app.repositories_impl.sqlite.user_repository import SQLiteUserRepository
from app.repositories_impl.sqlite.vacation_days_repository import SQLiteVacationDaysRepository
from app.repositories_impl.sqlite.workspace_repository import (
    SQLiteWorkspaceInvitationRepository,
    SQLiteWorkspaceRepository,
)
from app.services.allocation_service import AllocationInputLoader, PlanningEngineService
from app.services.analytics_service import AnalyticsService
from app.services.auth_service import AuthService
from app.services.calendar_service import CalendarService
from app.services.child_service import ChildService
from app.services.day_assertion_service import DayAssertionService
from app.services.day_override_service import DayOverrideService
from app.services.leave_wish_service import LeaveWishService
from app.services.personal_data_service import PersonalDataService
from app.services.planning_service import PlanningService
from app.services.preschool_planning_days_service import PreschoolPlanningDaysService
from app.services.tips_service import TipsService
from app.services.vacation_days_service import VacationDaysService
from app.services.workspace_service import WorkspaceService
from app.utils.errors import UnauthorizedError

_bearer = HTTPBearer(auto_error=False)


# ---------------------------------------------------------------------------
# DB connection
# ---------------------------------------------------------------------------


def get_connection(request: Request) -> aiosqlite.Connection:
    """Return the process-wide DB connection opened during app startup."""
    return request.app.state.db_connection


ConnectionDep = Annotated[aiosqlite.Connection, Depends(get_connection)]


def get_unit_of_work(conn: ConnectionDep) -> UnitOfWork:
    if settings.database_type == "sqlite":
        return SQLiteUnitOfWork(conn)
    raise ValueError(f"Unsupported database_type: {settings.database_type}")


UnitOfWorkDep = Annotated[UnitOfWork, Depends(get_unit_of_work)]


# ---------------------------------------------------------------------------
# Repository factories
# ---------------------------------------------------------------------------


def _sqlite_or_error(label: str) -> None:
    if settings.database_type not in ("sqlite", "postgres"):
        raise ValueError(f"Unsupported database_type for {label}: {settings.database_type}")


def get_user_repository(conn: ConnectionDep) -> UserRepository:
    if settings.database_type == "sqlite":
        return SQLiteUserRepository(conn)
    raise ValueError(f"Unsupported database_type: {settings.database_type}")


UserRepositoryDep = Annotated[UserRepository, Depends(get_user_repository)]


def get_personal_data_repository(conn: ConnectionDep) -> PersonalDataRepository:
    if settings.database_type == "sqlite":
        return SQLitePersonalDataRepository(conn)
    raise ValueError(f"Unsupported database_type: {settings.database_type}")


PersonalDataRepositoryDep = Annotated[PersonalDataRepository, Depends(get_personal_data_repository)]


def get_workspace_repository(conn: ConnectionDep) -> WorkspaceRepository:
    if settings.database_type == "sqlite":
        return SQLiteWorkspaceRepository(conn)
    raise ValueError(f"Unsupported database_type: {settings.database_type}")


WorkspaceRepositoryDep = Annotated[WorkspaceRepository, Depends(get_workspace_repository)]


def get_workspace_invitation_repository(conn: ConnectionDep) -> WorkspaceInvitationRepository:
    if settings.database_type == "sqlite":
        return SQLiteWorkspaceInvitationRepository(conn)
    raise ValueError(f"Unsupported database_type: {settings.database_type}")


WorkspaceInvitationRepositoryDep = Annotated[
    WorkspaceInvitationRepository, Depends(get_workspace_invitation_repository)
]


def get_child_repository(conn: ConnectionDep) -> ChildRepository:
    if settings.database_type == "sqlite":
        return SQLiteChildRepository(conn)
    raise ValueError(f"Unsupported database_type: {settings.database_type}")


ChildRepositoryDep = Annotated[ChildRepository, Depends(get_child_repository)]


def get_parental_leave_repository(conn: ConnectionDep) -> ParentalLeaveRepository:
    if settings.database_type == "sqlite":
        return SQLiteParentalLeaveRepository(conn)
    raise ValueError(f"Unsupported database_type: {settings.database_type}")


ParentalLeaveRepositoryDep = Annotated[
    ParentalLeaveRepository, Depends(get_parental_leave_repository)
]


def get_planned_leave_repository(conn: ConnectionDep) -> PlannedLeaveRepository:
    if settings.database_type == "sqlite":
        return SQLitePlannedLeaveRepository(conn)
    raise ValueError(f"Unsupported database_type: {settings.database_type}")


PlannedLeaveRepositoryDep = Annotated[PlannedLeaveRepository, Depends(get_planned_leave_repository)]


def get_vacation_days_repository(conn: ConnectionDep) -> VacationDaysRepository:
    if settings.database_type == "sqlite":
        return SQLiteVacationDaysRepository(conn)
    raise ValueError(f"Unsupported database_type: {settings.database_type}")


VacationDaysRepositoryDep = Annotated[VacationDaysRepository, Depends(get_vacation_days_repository)]


def get_leave_wish_repository(conn: ConnectionDep) -> LeaveWishRepository:
    if settings.database_type == "sqlite":
        return SQLiteLeaveWishRepository(conn)
    raise ValueError(f"Unsupported database_type: {settings.database_type}")


LeaveWishRepositoryDep = Annotated[LeaveWishRepository, Depends(get_leave_wish_repository)]


def get_day_assertion_repository(conn: ConnectionDep) -> DayAssertionRepository:
    if settings.database_type == "sqlite":
        return SQLiteDayAssertionRepository(conn)
    raise ValueError(f"Unsupported database_type: {settings.database_type}")


DayAssertionRepositoryDep = Annotated[DayAssertionRepository, Depends(get_day_assertion_repository)]


def get_preschool_planning_days_repository(
    conn: ConnectionDep,
) -> PreschoolPlanningDaysRepository:
    if settings.database_type == "sqlite":
        return SQLitePreschoolPlanningDaysRepository(conn)
    raise ValueError(f"Unsupported database_type: {settings.database_type}")


PreschoolPlanningDaysRepositoryDep = Annotated[
    PreschoolPlanningDaysRepository, Depends(get_preschool_planning_days_repository)
]


def get_day_override_repository(conn: ConnectionDep) -> DayOverrideRepository:
    if settings.database_type == "sqlite":
        return SQLiteDayOverrideRepository(conn)
    raise ValueError(f"Unsupported database_type: {settings.database_type}")


DayOverrideRepositoryDep = Annotated[DayOverrideRepository, Depends(get_day_override_repository)]


def get_tip_dismissal_repository(conn: ConnectionDep) -> TipDismissalRepository:
    if settings.database_type == "sqlite":
        return SQLiteTipDismissalRepository(conn)
    raise ValueError(f"Unsupported database_type: {settings.database_type}")


TipDismissalRepositoryDep = Annotated[TipDismissalRepository, Depends(get_tip_dismissal_repository)]


# ---------------------------------------------------------------------------
# Service factories
# ---------------------------------------------------------------------------


def get_auth_service(
    user_repo: UserRepositoryDep,
    pd_repo: PersonalDataRepositoryDep,
    ws_repo: WorkspaceRepositoryDep,
    inv_repo: WorkspaceInvitationRepositoryDep,
    uow: UnitOfWorkDep,
) -> AuthService:
    return AuthService(user_repo, pd_repo, ws_repo, uow=uow, inv_repo=inv_repo)


AuthServiceDep = Annotated[AuthService, Depends(get_auth_service)]


def get_vacation_days_service(repo: VacationDaysRepositoryDep) -> VacationDaysService:
    return VacationDaysService(repo)


VacationDaysServiceDep = Annotated[VacationDaysService, Depends(get_vacation_days_service)]


def get_preschool_planning_days_service(
    repo: PreschoolPlanningDaysRepositoryDep,
) -> PreschoolPlanningDaysService:
    return PreschoolPlanningDaysService(repo)


PreschoolPlanningDaysServiceDep = Annotated[
    PreschoolPlanningDaysService, Depends(get_preschool_planning_days_service)
]


def get_leave_wish_service(
    repo: LeaveWishRepositoryDep,
    planned_leave_repo: PlannedLeaveRepositoryDep,
    child_repo: ChildRepositoryDep,
    day_assertion_repo: DayAssertionRepositoryDep,
    uow: UnitOfWorkDep,
) -> LeaveWishService:
    # `child_repo` resolves "until the child turns 4" into a concrete last
    # year when a repeating wish is materialised — see LeaveWishService.
    # `day_assertion_repo` is what `delete()` uses to clear a pinned/promoted
    # row's assertion alongside the row itself (restructure step 3b). `uow`
    # makes `create`/`update`/`delete`'s multi-row writes atomic — this
    # service previously had none, so a crash mid-series-delete/re-projection
    # left a partially-applied series (adversarial-review-adjacent fix).
    return LeaveWishService(repo, planned_leave_repo, child_repo, day_assertion_repo, uow=uow)


LeaveWishServiceDep = Annotated[LeaveWishService, Depends(get_leave_wish_service)]


def get_day_override_service(repo: DayOverrideRepositoryDep) -> DayOverrideService:
    return DayOverrideService(repo)


DayOverrideServiceDep = Annotated[DayOverrideService, Depends(get_day_override_service)]


def get_calendar_service(day_override_service: DayOverrideServiceDep) -> CalendarService:
    return CalendarService(day_override_service)


CalendarServiceDep = Annotated[CalendarService, Depends(get_calendar_service)]


def get_tips_service(
    leave_repo: ParentalLeaveRepositoryDep,
    planned_repo: PlannedLeaveRepositoryDep,
    child_repo: ChildRepositoryDep,
    pd_repo: PersonalDataRepositoryDep,
    vacation_repo: VacationDaysRepositoryDep,
    leave_wish_repo: LeaveWishRepositoryDep,
    dismissal_repo: TipDismissalRepositoryDep,
) -> TipsService:
    return TipsService(
        leave_repo,
        planned_repo,
        child_repo,
        pd_repo,
        vacation_repo,
        leave_wish_repo,
        dismissal_repo,
    )


TipsServiceDep = Annotated[TipsService, Depends(get_tips_service)]


def get_child_service(repo: ChildRepositoryDep) -> ChildService:
    return ChildService(repo)


ChildServiceDep = Annotated[ChildService, Depends(get_child_service)]


def get_personal_data_service(repo: PersonalDataRepositoryDep) -> PersonalDataService:
    return PersonalDataService(repo)


PersonalDataServiceDep = Annotated[PersonalDataService, Depends(get_personal_data_service)]


def get_workspace_service(
    ws_repo: WorkspaceRepositoryDep,
    inv_repo: WorkspaceInvitationRepositoryDep,
    pd_repo: PersonalDataRepositoryDep,
    user_repo: UserRepositoryDep,
    leave_wish_repo: LeaveWishRepositoryDep,
    planned_leave_repo: PlannedLeaveRepositoryDep,
    parental_leave_repo: ParentalLeaveRepositoryDep,
    vacation_days_repo: VacationDaysRepositoryDep,
    uow: UnitOfWorkDep,
) -> WorkspaceService:
    return WorkspaceService(
        ws_repo,
        inv_repo,
        pd_repo,
        user_repo,
        leave_wish_repo,
        planned_leave_repo,
        parental_leave_repo,
        vacation_days_repo,
        uow=uow,
    )


WorkspaceServiceDep = Annotated[WorkspaceService, Depends(get_workspace_service)]


def get_analytics_service(
    leave_repo: ParentalLeaveRepositoryDep,
    planned_repo: PlannedLeaveRepositoryDep,
    child_repo: ChildRepositoryDep,
    pd_repo: PersonalDataRepositoryDep,
    workspace_repo: WorkspaceRepositoryDep,
    vacation_repo: VacationDaysRepositoryDep,
) -> AnalyticsService:
    return AnalyticsService(
        leave_repo, planned_repo, child_repo, pd_repo, workspace_repo, vacation_repo
    )


AnalyticsServiceDep = Annotated[AnalyticsService, Depends(get_analytics_service)]


def get_day_assertion_service(
    repo: DayAssertionRepositoryDep,
    planned_leave_repo: PlannedLeaveRepositoryDep,
    analytics_service: AnalyticsServiceDep,
    workspace_repo: WorkspaceRepositoryDep,
    day_override_repo: DayOverrideRepositoryDep,
    uow: UnitOfWorkDep,
) -> DayAssertionService:
    # Restructure step 3b: this is now the ONE write path behind
    # `POST /api/day-assertions`, mirroring into `planned_leave_day` and
    # enforcing the same guards `PlanningService.add_planned_day`/`update`
    # used to — see `DayAssertionService`'s docstring. `uow` makes the
    # assertion write + mirror write atomic (adversarial-review fix).
    return DayAssertionService(
        repo,
        planned_leave_repo=planned_leave_repo,
        analytics_service=analytics_service,
        uow=uow,
        workspace_repo=workspace_repo,
        day_override_repo=day_override_repo,
    )


DayAssertionServiceDep = Annotated[DayAssertionService, Depends(get_day_assertion_service)]


def get_allocation_input_loader(
    workspace_repo: WorkspaceRepositoryDep,
    child_repo: ChildRepositoryDep,
    pd_repo: PersonalDataRepositoryDep,
    parental_leave_repo: ParentalLeaveRepositoryDep,
    vacation_repo: VacationDaysRepositoryDep,
    planned_leave_repo: PlannedLeaveRepositoryDep,
    leave_wish_repo: LeaveWishRepositoryDep,
    day_override_repo: DayOverrideRepositoryDep,
    preschool_planning_days_repo: PreschoolPlanningDaysRepositoryDep,
    day_assertion_repo: DayAssertionRepositoryDep,
) -> AllocationInputLoader:
    return AllocationInputLoader(
        workspace_repo=workspace_repo,
        child_repo=child_repo,
        personal_data_repo=pd_repo,
        parental_leave_repo=parental_leave_repo,
        vacation_repo=vacation_repo,
        planned_leave_repo=planned_leave_repo,
        leave_wish_repo=leave_wish_repo,
        day_override_repo=day_override_repo,
        preschool_planning_days_repo=preschool_planning_days_repo,
        day_assertion_repo=day_assertion_repo,
    )


AllocationInputLoaderDep = Annotated[AllocationInputLoader, Depends(get_allocation_input_loader)]


def get_planning_engine_service(loader: AllocationInputLoaderDep) -> PlanningEngineService:
    return PlanningEngineService(loader)


PlanningEngineServiceDep = Annotated[PlanningEngineService, Depends(get_planning_engine_service)]


def get_planning_service(
    repo: PlannedLeaveRepositoryDep,
    analytics_service: AnalyticsServiceDep,
    parental_leave_repo: ParentalLeaveRepositoryDep,
    vacation_repo: VacationDaysRepositoryDep,
    planning_engine_service: PlanningEngineServiceDep,
    uow: UnitOfWorkDep,
    workspace_repo: WorkspaceRepositoryDep,
    day_override_repo: DayOverrideRepositoryDep,
    leave_wish_service: LeaveWishServiceDep,
    day_assertion_repo: DayAssertionRepositoryDep,
) -> PlanningService:
    return PlanningService(
        repo,
        analytics_service,
        parental_leave_repo,
        vacation_repo,
        planning_engine_service,
        uow=uow,
        workspace_repo=workspace_repo,
        day_override_repo=day_override_repo,
        # Only needed by `sync_with_wish` (POST /api/plan/sync-with-wish) —
        # see that method's docstring.
        leave_wish_service=leave_wish_service,
        # `pinned_keys` (sync_plan's own pre-write snapshot) and
        # `sync_with_wish`'s 'attach'/'pin'/'unpin' day-lock actions — see
        # PlanningService's docstring.
        day_assertion_repo=day_assertion_repo,
    )


PlanningServiceDep = Annotated[PlanningService, Depends(get_planning_service)]


# ---------------------------------------------------------------------------
# Current-user dependency (JWT bearer)
# ---------------------------------------------------------------------------


async def get_current_user(
    service: AuthServiceDep,
    credentials: HTTPAuthorizationCredentials | None = Depends(_bearer),
) -> User:
    """Extract and verify the JWT bearer token; return the authenticated User."""
    if credentials is None:
        raise HTTPException(status.HTTP_401_UNAUTHORIZED, "Not authenticated")
    try:
        return await service.get_user_from_token(credentials.credentials)
    except UnauthorizedError as exc:
        raise HTTPException(status.HTTP_401_UNAUTHORIZED, str(exc)) from exc


CurrentUserDep = Annotated[User, Depends(get_current_user)]


# ---------------------------------------------------------------------------
# Tenant scoping
# ---------------------------------------------------------------------------
#
# Rule of thumb: identity-derived facts (which workspace the caller belongs
# to) live here in the DI layer; entity-ownership checks that require loading
# a row (e.g. a leave wish's own workspace_id) live in the service, mirroring
# `WorkspaceService._get_member`. Routers stay thin: they hand the resolved
# scope to the service and let a NotFoundError become a 404 — never a 403,
# so a foreign id never confirms its own existence. See the T1 authz audit,
# §3 "Scoping primitive — design for app/dependencies.py".


async def get_current_personal_data(
    current_user: CurrentUserDep, pd_repo: PersonalDataRepositoryDep
) -> PersonalData:
    """The caller's own PersonalData row — the root of tenant scoping."""
    pd = await pd_repo.get_by_id(current_user.personal_data_uuid)
    if pd is None or pd.deleted_at is not None:
        raise HTTPException(status.HTTP_401_UNAUTHORIZED, "No parent profile for this account")
    return pd


CurrentPersonalDataDep = Annotated[PersonalData, Depends(get_current_personal_data)]


async def get_current_workspace_id(pd: CurrentPersonalDataDep) -> UUID:
    return pd.workspace_id


CurrentWorkspaceIdDep = Annotated[UUID, Depends(get_current_workspace_id)]


def _not_found(kind: str, id_: UUID) -> HTTPException:
    # 404, never 403: do not confirm that a foreign id exists.
    return HTTPException(status.HTTP_404_NOT_FOUND, f"{kind} {id_} not found")


async def require_workspace_access(workspace_id: UUID, current: CurrentWorkspaceIdDep) -> UUID:
    """Path-param guard for `/{workspace_id}/...` routes.

    FastAPI binds the `workspace_id` path param by name, so a router only
    has to declare `workspace_id: WorkspaceIdDep` in place of `UUID` to get
    this check for free.
    """
    if workspace_id != current:
        raise _not_found("Workspace", workspace_id)
    return workspace_id


WorkspaceIdDep = Annotated[UUID, Depends(require_workspace_access)]


@dataclass(frozen=True)
class WorkspaceScope:
    """The caller's tenant, plus helpers for ids arriving in a body/query.

    `check_workspace` is a cheap identity comparison (no DB read — the
    caller's own workspace_id is already known). `check_child`/`check_member`
    load the row because ownership can only be known after the load; both
    404 (never 403) on a missing OR foreign-workspace id, so a foreign id can
    never be distinguished from a nonexistent one.
    """

    workspace_id: UUID
    personal_data_uuid: UUID
    user_id: UUID
    _child_repo: ChildRepository
    _pd_repo: PersonalDataRepository

    def check_workspace(self, workspace_id: UUID) -> UUID:
        if workspace_id != self.workspace_id:
            raise _not_found("Workspace", workspace_id)
        return workspace_id

    async def check_child(self, child_id: UUID) -> Child:
        child = await self._child_repo.get_by_id(child_id)
        if child is None or child.workspace_id != self.workspace_id:
            raise _not_found("Child", child_id)
        return child

    async def check_member(self, personal_data_uuid: UUID) -> PersonalData:
        pd = await self._pd_repo.get_by_id(personal_data_uuid)
        if pd is None or pd.deleted_at is not None or pd.workspace_id != self.workspace_id:
            raise _not_found("PersonalData", personal_data_uuid)
        return pd


async def get_workspace_scope(
    current_user: CurrentUserDep,
    pd: CurrentPersonalDataDep,
    child_repo: ChildRepositoryDep,
    pd_repo: PersonalDataRepositoryDep,
) -> WorkspaceScope:
    return WorkspaceScope(pd.workspace_id, pd.uuid, current_user.id, child_repo, pd_repo)


WorkspaceScopeDep = Annotated[WorkspaceScope, Depends(get_workspace_scope)]