"""
In-memory data store for the Veterinary Clinic example.

This module is NOT thread-safe and is intended for demos and scaffolds only.

It provides minimal, process-local data stores for the five veterinary
clinic entities. Each store exposes standard CRUD operations backed by
a simple dictionary.

This module intentionally avoids:
- persistence
- concurrency guarantees
- transactional semantics
- validation beyond what Pydantic provides

This module is not part of the ``openapi_first`` library API surface.
"""

from datetime import datetime, timezone

from models import (
    Parent, ParentCreate,
    Vet, VetCreate,
    Treatment, TreatmentCreate,
    Pet, PetCreate,
    Appointment, AppointmentCreate,
)


def _now():
    return datetime.now(timezone.utc).isoformat()


# ---------------------------------------------------------------------------
# Parents
# ---------------------------------------------------------------------------

_parents: dict[int, Parent] = {}
_parents_next_id = 1


def list_parents() -> list[Parent]:
    return list(_parents.values())


def get_parent(parent_id: int) -> Parent:
    return _parents[parent_id]


def create_parent(payload: ParentCreate) -> Parent:
    global _parents_next_id
    now = _now()
    parent = Parent(
        id=_parents_next_id,
        **payload.model_dump(exclude={"id", "metadata"}),
        metadata={"createdOn": now, "updatedOn": now} if payload.metadata else None,
    )
    _parents[_parents_next_id] = parent
    _parents_next_id += 1
    return parent


def update_parent(parent_id: int, payload: ParentCreate) -> Parent:
    if parent_id not in _parents:
        raise KeyError(parent_id)
    now = _now()
    parent = _parents[parent_id]
    updated = parent.model_copy(
        update={
            **payload.model_dump(exclude={"id", "metadata"}),
            "metadata": {"createdOn": parent.metadata.get("createdOn", now), "updatedOn": now}
            if parent.metadata else None,
        }
    )
    _parents[parent_id] = updated
    return updated


def delete_parent(parent_id: int) -> None:
    del _parents[parent_id]


# ---------------------------------------------------------------------------
# Vets
# ---------------------------------------------------------------------------

_vets: dict[int, Vet] = {}
_vets_next_id = 1


def list_vets() -> list[Vet]:
    return list(_vets.values())


def get_vet(vet_id: int) -> Vet:
    return _vets[vet_id]


def create_vet(payload: VetCreate) -> Vet:
    global _vets_next_id
    now = _now()
    vet = Vet(
        id=_vets_next_id,
        **payload.model_dump(exclude={"id", "metadata"}),
        metadata={"createdOn": now, "updatedOn": now} if payload.metadata else None,
    )
    _vets[_vets_next_id] = vet
    _vets_next_id += 1
    return vet


def update_vet(vet_id: int, payload: VetCreate) -> Vet:
    if vet_id not in _vets:
        raise KeyError(vet_id)
    now = _now()
    vet = _vets[vet_id]
    updated = vet.model_copy(
        update={
            **payload.model_dump(exclude={"id", "metadata"}),
            "metadata": {"createdOn": vet.metadata.get("createdOn", now), "updatedOn": now}
            if vet.metadata else None,
        }
    )
    _vets[vet_id] = updated
    return updated


def delete_vet(vet_id: int) -> None:
    del _vets[vet_id]


# ---------------------------------------------------------------------------
# Treatments
# ---------------------------------------------------------------------------

_treatments: dict[int, Treatment] = {}
_treatments_next_id = 1


def list_treatments() -> list[Treatment]:
    return list(_treatments.values())


def get_treatment(treatment_id: int) -> Treatment:
    return _treatments[treatment_id]


def create_treatment(payload: TreatmentCreate) -> Treatment:
    global _treatments_next_id
    now = _now()
    treatment = Treatment(
        id=_treatments_next_id,
        **payload.model_dump(exclude={"id", "metadata"}),
        metadata={"createdOn": now, "updatedOn": now} if payload.metadata else None,
    )
    _treatments[_treatments_next_id] = treatment
    _treatments_next_id += 1
    return treatment


def update_treatment(treatment_id: int, payload: TreatmentCreate) -> Treatment:
    if treatment_id not in _treatments:
        raise KeyError(treatment_id)
    now = _now()
    treatment = _treatments[treatment_id]
    updated = treatment.model_copy(
        update={
            **payload.model_dump(exclude={"id", "metadata"}),
            "metadata": {"createdOn": treatment.metadata.get("createdOn", now), "updatedOn": now}
            if treatment.metadata else None,
        }
    )
    _treatments[treatment_id] = updated
    return updated


def delete_treatment(treatment_id: int) -> None:
    del _treatments[treatment_id]


# ---------------------------------------------------------------------------
# Pets
# ---------------------------------------------------------------------------

_pets: dict[int, Pet] = {}
_pets_next_id = 1


def list_pets() -> list[Pet]:
    return list(_pets.values())


def get_pet(pet_id: int) -> Pet:
    return _pets[pet_id]


def create_pet(payload: PetCreate) -> Pet:
    global _pets_next_id
    now = _now()
    pet = Pet(
        id=_pets_next_id,
        **payload.model_dump(exclude={"id", "metadata"}),
        metadata={"createdOn": now, "updatedOn": now} if payload.metadata else None,
    )
    _pets[_pets_next_id] = pet
    _pets_next_id += 1
    return pet


def update_pet(pet_id: int, payload: PetCreate) -> Pet:
    if pet_id not in _pets:
        raise KeyError(pet_id)
    now = _now()
    pet = _pets[pet_id]
    updated = pet.model_copy(
        update={
            **payload.model_dump(exclude={"id", "metadata"}),
            "metadata": {"createdOn": pet.metadata.get("createdOn", now), "updatedOn": now}
            if pet.metadata else None,
        }
    )
    _pets[pet_id] = updated
    return updated


def delete_pet(pet_id: int) -> None:
    del _pets[pet_id]


# ---------------------------------------------------------------------------
# Appointments
# ---------------------------------------------------------------------------

_appointments: dict[int, Appointment] = {}
_appointments_next_id = 1


def list_appointments() -> list[Appointment]:
    return list(_appointments.values())


def get_appointment(appointment_id: int) -> Appointment:
    return _appointments[appointment_id]


def create_appointment(payload: AppointmentCreate) -> Appointment:
    global _appointments_next_id
    now = _now()
    appointment = Appointment(
        id=_appointments_next_id,
        **payload.model_dump(exclude={"id", "metadata"}),
        metadata={"createdOn": now, "updatedOn": now} if payload.metadata else None,
    )
    _appointments[_appointments_next_id] = appointment
    _appointments_next_id += 1
    return appointment


def update_appointment(appointment_id: int, payload: AppointmentCreate) -> Appointment:
    if appointment_id not in _appointments:
        raise KeyError(appointment_id)
    now = _now()
    appointment = _appointments[appointment_id]
    updated = appointment.model_copy(
        update={
            **payload.model_dump(exclude={"id", "metadata"}),
            "metadata": {"createdOn": appointment.metadata.get("createdOn", now), "updatedOn": now}
            if appointment.metadata else None,
        }
    )
    _appointments[appointment_id] = updated
    return updated


def delete_appointment(appointment_id: int) -> None:
    del _appointments[appointment_id]