import * as SecureStore from 'expo-secure-store';
import { api } from './api';

const CONSENT_KEY = 'consents';

export interface Consents {
  essential: boolean;
  analytics: boolean;
  preferences: boolean;
  health_data: boolean;
}

const DEFAULT_CONSENTS: Consents = {
  essential: true,
  analytics: false,
  preferences: false,
  health_data: false,
};

export async function getLocalConsents(): Promise<Consents> {
  try {
    const stored = await SecureStore.getItemAsync(CONSENT_KEY);
    if (stored) return { ...DEFAULT_CONSENTS, ...JSON.parse(stored), essential: true };
  } catch {}
  return { ...DEFAULT_CONSENTS };
}

export async function setLocalConsents(consents: Consents): Promise<void> {
  try { await SecureStore.setItemAsync(CONSENT_KEY, JSON.stringify(consents)); } catch {}
}

export async function hasConsentChoice(): Promise<boolean> {
  try { return (await SecureStore.getItemAsync(CONSENT_KEY)) !== null; } catch { return false; }
}

export async function fetchServerConsents(): Promise<Consents | null> {
  try {
    const res = await api.get('/consents');
    await setLocalConsents(res.data);
    return res.data;
  } catch { return null; }
}

export async function saveConsents(consents: Consents): Promise<Consents> {
  const toSave = { ...consents, essential: true };
  await setLocalConsents(toSave);
  try {
    const res = await api.put('/consents', {
      categories: { analytics: toSave.analytics, preferences: toSave.preferences, health_data: toSave.health_data },
    });
    await setLocalConsents(res.data);
    return res.data;
  } catch { return toSave; }
}

export async function hasConsent(category: keyof Consents): Promise<boolean> {
  const consents = await getLocalConsents();
  return consents[category] === true;
}