"""Pont GUI V6 → moteur d'anonymisation (G3-A).

Construit les kwargs d'appel du moteur (``process_document``) au plus proche de
la V5 / du CLI de production, et charge les managers NER **paresseusement** :

- aucun manager n'est importé ni instancié à l'import de ce module ;
- le chargement réel n'a lieu qu'au premier traitement (``ensure_loaded``) ;
- les factories sont injectables pour les tests (aucun modèle, aucun réseau).

Mapping moteur (identique au CLI validé `scripts/anonymize_cli.py`) :
- ``camembert_manager`` ← CamembertNerManager (NER local principal)
- ``ner_manager``       ← EdsPseudoManager (optionnel)
- ``gliner_manager``    ← GlinerManager (optionnel)
- ``use_hf``            ← True si au moins un manager NER est chargé

Aucune logique de détection ici : on orchestre uniquement.
"""

from __future__ import annotations

from dataclasses import dataclass
from enum import Enum
from pathlib import Path
from typing import Any, Callable, Optional

ProcessFn = Callable[[Path, Path], dict]
ManagerFactory = Callable[[], Any]


class ManagerState(str, Enum):
    NOT_LOADED = "not_loaded"
    LOADING = "loading"
    READY = "ready"
    UNAVAILABLE = "unavailable"


@dataclass
class EngineSettings:
    """Réglages d'appel moteur exposés par l'onglet Configuration."""

    make_vector_redaction: bool = False
    also_make_raster_burn: bool = True
    config_path: Optional[Path] = None
    use_local_ner: bool = True
    enable_eds: bool = False
    enable_gliner: bool = False
    ogc_label: Optional[str] = None
    profile: Optional[str] = None


def _default_factories() -> dict[str, ManagerFactory]:
    """Factories par défaut : import paresseux, instanciation + load réels.

    Définies dans une fonction pour qu'aucun manager ne soit importé à l'import
    de ce module.
    """

    def camembert() -> Any:
        from camembert_ner_manager import CamembertNerManager

        manager = CamembertNerManager()
        manager.load()
        return manager

    def eds() -> Any:
        from eds_pseudo_manager import EdsPseudoManager

        manager = EdsPseudoManager()
        manager.load()
        return manager

    def gliner() -> Any:
        from gliner_manager import GlinerManager

        manager = GlinerManager()
        manager.load()
        return manager

    return {"camembert": camembert, "eds": eds, "gliner": gliner}


class NerManagers:
    """Conteneur de managers NER à chargement paresseux."""

    def __init__(
        self,
        settings: EngineSettings,
        factories: Optional[dict[str, ManagerFactory]] = None,
    ) -> None:
        self._settings = settings
        self._factories = factories if factories is not None else _default_factories()
        self._camembert: Any = None
        self._eds: Any = None
        self._gliner: Any = None
        self._state = ManagerState.NOT_LOADED

    @property
    def state(self) -> ManagerState:
        return self._state

    @property
    def use_hf(self) -> bool:
        return bool(self._camembert or self._eds or self._gliner)

    def as_kwargs(self) -> dict:
        return {
            "ner_manager": self._eds,
            "gliner_manager": self._gliner,
            "camembert_manager": self._camembert,
        }

    def ensure_loaded(self) -> ManagerState:
        """Charge les managers requis si nécessaire. Idempotent, sans crash."""
        if not self._settings.use_local_ner:
            self._state = ManagerState.NOT_LOADED
            return self._state
        if self._state == ManagerState.READY:
            return self._state

        self._state = ManagerState.LOADING
        try:
            # CamemBERT-bio est le NER local principal (obligatoire si NER actif).
            self._camembert = self._factories["camembert"]()
        except Exception:
            self._state = ManagerState.UNAVAILABLE
            return self._state

        if self._settings.enable_eds:
            try:
                self._eds = self._factories["eds"]()
            except Exception:
                self._eds = None  # optionnel : absence tolérée
        if self._settings.enable_gliner:
            try:
                self._gliner = self._factories["gliner"]()
            except Exception:
                self._gliner = None  # optionnel : absence tolérée

        self._state = ManagerState.READY
        return self._state


def build_engine_kwargs(
    settings: EngineSettings, managers: Optional[NerManagers] = None
) -> dict:
    """Construit le dict de kwargs passé au moteur."""
    kwargs: dict = {
        "make_vector_redaction": settings.make_vector_redaction,
        "also_make_raster_burn": settings.also_make_raster_burn,
        "config_path": settings.config_path,
        "ogc_label": settings.ogc_label,
    }
    if managers is not None and settings.use_local_ner:
        kwargs.update(managers.as_kwargs())
        kwargs["use_hf"] = managers.use_hf
    else:
        kwargs["use_hf"] = False
    return kwargs


def make_process_fn(
    settings: EngineSettings,
    managers: Optional[NerManagers] = None,
    engine: Optional[Callable[..., dict]] = None,
) -> ProcessFn:
    """Retourne un ``process_fn(doc, out_dir)`` câblé au moteur.

    ``engine`` est injectable pour les tests ; par défaut, import paresseux de
    ``process_document`` (aucun chargement du moteur à l'import de ce module).
    """
    managers = managers if managers is not None else NerManagers(settings)

    def process_fn(doc_path: Path, out_dir: Path) -> dict:
        if settings.use_local_ner:
            managers.ensure_loaded()
        kwargs = build_engine_kwargs(settings, managers)
        run = engine
        if run is None:
            from anonymizer_core_refactored_onnx import process_document

            run = process_document
        return run(doc_path, out_dir, **kwargs)

    return process_fn