from functools import lru_cache
from typing import Any, cast

from app.service.agent.factory import AgentFactory
from app.service.intent_classifier import IntentClassifier
from app.service.model_gateway import (
    DatabaseModelEndpointResolver,
    DatabaseModelGateway,
    ModelDispatchService,
    ModelGenerationService,
)
from app.service.suitability_service import (
    SuitabilityToolInput,
    suitability_tool_handler,
)
from app.service.tool_executor import ToolDefinition, ToolExecutor, ToolRegistry


@lru_cache(maxsize=1)
def get_agent_factory() -> AgentFactory:
    """HTTP 与 Worker 共用的唯一底座依赖组装入口。"""
    registry = ToolRegistry()
    registry.register(ToolDefinition(
        name="check_suitability",
        input_model=SuitabilityToolInput,
        handler=cast(Any, suitability_tool_handler),
        required_permission="suitability:read",
        allowed_roles=("customer", "advisor", "operator", "admin"),
    ))
    model_service = ModelGenerationService(ModelDispatchService(DatabaseModelGateway()))
    endpoint_resolver = DatabaseModelEndpointResolver()
    return AgentFactory(
        model_service=model_service,
        tool_executor=ToolExecutor(registry),
        intent_classifier=IntentClassifier(model_service),
        intent_endpoint_resolver=endpoint_resolver,
    )