import AsyncStorage from '@react-native-async-storage/async-storage';
import { OnboardingProgressService } from './onboardingProgressService';

const STORAGE_KEY = 'greenlens_preauth_onboarding_v1';

export type PreAuthAnswers = {
  acquisitionSource?: string;
  primaryGoal?: string;
  experienceLevel?: string;
  lightLevel?: string;
};

export const PreAuthOnboardingService = {
  async setAnswer<K extends keyof PreAuthAnswers>(key: K, value: PreAuthAnswers[K]): Promise<void> {
    const answers = await this.getAnswers();
    answers[key] = value;
    await AsyncStorage.setItem(STORAGE_KEY, JSON.stringify(answers));
  },

  async getAnswers(): Promise<PreAuthAnswers> {
    try {
      const raw = await AsyncStorage.getItem(STORAGE_KEY);
      return raw ? (JSON.parse(raw) as PreAuthAnswers) : {};
    } catch {
      return {};
    }
  },

  // Persist buffered answers into the per-user profile after sign-up/login.
  async flushToProfile(userId: number): Promise<void> {
    const answers = await this.getAnswers();
    if (answers.acquisitionSource) OnboardingProgressService.setAcquisitionSource(userId, answers.acquisitionSource);
    if (answers.primaryGoal) OnboardingProgressService.setPrimaryGoal(userId, answers.primaryGoal);
    if (answers.experienceLevel) OnboardingProgressService.setExperienceLevel(userId, answers.experienceLevel);
    await AsyncStorage.removeItem(STORAGE_KEY);
  },
};