/** Versioned onboarding tour persistence (driver.js). Bump to re-show tours. */
export const ONBOARDING_VERSION = 2;

export type OnboardingTourId = 'dashboard' | 'wizard' | 'workspace';

const STORAGE_KEY = 'grantforge_onboarding';

type OnboardingPayload = {
  version: number;
  tours: Partial<Record<OnboardingTourId, boolean>>;
};

const LEGACY_KEYS: Record<OnboardingTourId, string> = {
  dashboard: 'has_seen_tour_dashboard',
  wizard: 'has_seen_tour_wizard',
  workspace: 'has_seen_tour_workspace',
};

function readPayload(): OnboardingPayload {
  try {
    const raw = localStorage.getItem(STORAGE_KEY);
    if (!raw) {
      return { version: ONBOARDING_VERSION, tours: {} };
    }
    const parsed = JSON.parse(raw) as OnboardingPayload;
    return {
      version: parsed.version ?? 0,
      tours: parsed.tours ?? {},
    };
  } catch {
    return { version: 0, tours: {} };
  }
}

function writePayload(payload: OnboardingPayload): void {
  localStorage.setItem(STORAGE_KEY, JSON.stringify(payload));
}

/** Remove legacy keys; version bump in storage resets tour completion. */
export function migrateLegacyOnboardingKeys(): void {
  const payload = readPayload();
  if (payload.version !== ONBOARDING_VERSION) {
    writePayload({ version: ONBOARDING_VERSION, tours: {} });
  }
  (Object.values(LEGACY_KEYS) as string[]).forEach((key) => {
    localStorage.removeItem(key);
  });
}

export function hasSeenTour(tourId: OnboardingTourId): boolean {
  migrateLegacyOnboardingKeys();
  const payload = readPayload();
  if (payload.version !== ONBOARDING_VERSION) {
    return false;
  }
  return Boolean(payload.tours[tourId]);
}

export function markTourSeen(tourId: OnboardingTourId): void {
  migrateLegacyOnboardingKeys();
  const payload = readPayload();
  payload.version = ONBOARDING_VERSION;
  payload.tours[tourId] = true;
  writePayload(payload);
}

export function resetTour(tourId: OnboardingTourId): void {
  migrateLegacyOnboardingKeys();
  const payload = readPayload();
  payload.version = ONBOARDING_VERSION;
  delete payload.tours[tourId];
  writePayload(payload);
}

export function resetAllTours(): void {
  writePayload({ version: ONBOARDING_VERSION, tours: {} });
  (Object.values(LEGACY_KEYS) as string[]).forEach((key) => {
    localStorage.removeItem(key);
  });
}