import { create } from 'zustand';

/**
 * Onboarding Store — manages the guided tour state for first-time users.
 * Persists to localStorage so progress survives page reloads.
 */

const STORAGE_KEY = 'leocrm_onboarding';

export interface OnboardingState {
  isActive: boolean;
  step: number;
  completed: boolean;
  skipped: boolean;
  start: () => void;
  next: () => void;
  prev: () => void;
  skip: () => void;
  complete: () => void;
  goToStep: (n: number) => void;
  reset: () => void;
}

interface PersistedData {
  step: number;
  completed: boolean;
  skipped: boolean;
}

function loadPersisted(): Partial<OnboardingState> {
  try {
    const raw = localStorage.getItem(STORAGE_KEY);
    if (!raw) return {};
    const data: PersistedData = JSON.parse(raw);
    return {
      step: data.step ?? 0,
      completed: data.completed ?? false,
      skipped: data.skipped ?? false,
    };
  } catch {
    return {};
  }
}

function persist(state: OnboardingState): void {
  try {
    const data: PersistedData = {
      step: state.step,
      completed: state.completed,
      skipped: state.skipped,
    };
    localStorage.setItem(STORAGE_KEY, JSON.stringify(data));
  } catch {
    // localStorage may be unavailable in some contexts
  }
}

const initial = loadPersisted();

export const useOnboardingStore = create<OnboardingState>((set, get) => ({
  isActive: false,
  step: initial.step ?? 0,
  completed: initial.completed ?? false,
  skipped: initial.skipped ?? false,

  start: () => {
    set({ isActive: true, step: 0, completed: false, skipped: false });
    persist(get());
  },

  next: () => {
    const s = get();
    set({ step: s.step + 1 });
    persist(get());
  },

  prev: () => {
    const s = get();
    set({ step: Math.max(0, s.step - 1) });
    persist(get());
  },

  skip: () => {
    set({ isActive: false, skipped: true });
    persist(get());
  },

  complete: () => {
    set({ isActive: false, completed: true, step: 0 });
    persist(get());
  },

  goToStep: (n: number) => {
    set({ step: Math.max(0, n) });
    persist(get());
  },

  reset: () => {
    set({ isActive: false, step: 0, completed: false, skipped: false });
    persist(get());
  },
}));