import json
from typing import Dict
from .config import Config
import random


class ResponseGenerator:
    def __init__(self, config: Config):
        with config.responses_path.open('r', encoding='utf-8') as file:
            self.responses: Dict[str, dict] = json.load(file)

    def nlg(self, system_act):
        intent = system_act.intent
        slot = system_act.slots[0].name if system_act.slots else None

        intent_responses = self.responses.get(intent, {})
        slot_responses = intent_responses.get(slot)

        if isinstance(slot_responses, list):
            return random.choice(slot_responses)
        elif isinstance(slot_responses, str):
            return slot_responses
        else:
            return "Nieznane zapytanie."