"""FastAPI dependency providers for service instances.

Each provider retrieves the service from request.app.state.services (the
ServiceContainer attached during application lifespan startup).
"""

from __future__ import annotations

from dataclasses import dataclass
from typing import Any

from fastapi import Request

from app.data.loader import DatasetLoader
from app.models.registry import ModelRegistry
from app.monitoring.prediction_logger import PredictionLogger
from app.services.explanation_service import ExplanationService


@dataclass
class ServiceContainer:
    """Holds all service instances initialized at startup.

    Services that have not yet been implemented are typed as Any and
    set to None until their implementation tasks are completed.
    """

    registry: ModelRegistry
    loader: DatasetLoader
    explainer: ExplanationService
    pred_logger: PredictionLogger

    # Inference services — set to None until implemented (tasks 4.x, 5.x, 6.x)
    lo_tagging: Any = None
    bloom: Any = None
    mastery: Any = None
    risk: Any = None
    recommendation: Any = None
    answer_evaluation: Any = None
    student_profile: Any = None
    class_insights: Any = None
    teacher_feedback: Any = None
    monitoring: Any = None


def get_service_container(request: Request) -> ServiceContainer:
    """Retrieve the full ServiceContainer from app state."""
    return request.app.state.services


def get_lo_tagging_service(request: Request) -> Any:
    """Provide the LO tagging service instance."""
    return request.app.state.services.lo_tagging


def get_bloom_service(request: Request) -> Any:
    """Provide the Bloom classification service instance."""
    return request.app.state.services.bloom


def get_mastery_service(request: Request) -> Any:
    """Provide the mastery prediction service instance."""
    return request.app.state.services.mastery


def get_risk_service(request: Request) -> Any:
    """Provide the risk prediction service instance."""
    return request.app.state.services.risk


def get_recommendation_service(request: Request) -> Any:
    """Provide the recommendation service instance."""
    return request.app.state.services.recommendation


def get_answer_evaluation_service(request: Request) -> Any:
    """Provide the answer evaluation service instance."""
    return request.app.state.services.answer_evaluation


def get_student_profile_service(request: Request) -> Any:
    """Provide the student profile service instance."""
    return request.app.state.services.student_profile


def get_class_insights_service(request: Request) -> Any:
    """Provide the class insights service instance."""
    return request.app.state.services.class_insights


def get_teacher_feedback_service(request: Request) -> Any:
    """Provide the teacher feedback service instance."""
    return request.app.state.services.teacher_feedback


def get_monitoring_service(request: Request) -> Any:
    """Provide the monitoring service instance."""
    return request.app.state.services.monitoring