"""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 typing import Annotated

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

from app.config import settings
from app.entities.user import User
from app.repositories.child_repository import ChildRepository
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.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_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.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_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.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)]


# ---------------------------------------------------------------------------
# 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_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)]


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


def get_auth_service(
    user_repo: UserRepositoryDep,
    pd_repo: PersonalDataRepositoryDep,
    ws_repo: WorkspaceRepositoryDep,
) -> AuthService:
    return AuthService(user_repo, pd_repo, ws_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_leave_wish_service(repo: LeaveWishRepositoryDep) -> LeaveWishService:
    return LeaveWishService(repo)


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_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,
) -> WorkspaceService:
    return WorkspaceService(
        ws_repo,
        inv_repo,
        pd_repo,
        user_repo,
        leave_wish_repo,
        planned_leave_repo,
        parental_leave_repo,
        vacation_days_repo,
    )


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,
) -> AnalyticsService:
    return AnalyticsService(leave_repo, planned_repo, child_repo, pd_repo, workspace_repo)


AnalyticsServiceDep = Annotated[AnalyticsService, Depends(get_analytics_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,
) -> 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,
    )


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,
) -> PlanningService:
    return PlanningService(
        repo, analytics_service, parental_leave_repo, vacation_repo, planning_engine_service
    )


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)]