"use client";

import { create } from "zustand";
import { createJSONStorage, persist } from "zustand/middleware";

// Cuenta de cliente real conectada a Medusa (Store API, via
// /api/customer/*), mismo patron que cart-store.ts: token + datos basicos
// persistidos en localStorage, resincronizados contra el servidor al
// rehidratar (el token puede llevar dias, o haber sido revocado).
export interface Customer {
  id: string;
  email: string;
  firstName: string | null;
  lastName: string | null;
}

interface CustomerState {
  token: string | null;
  customer: Customer | null;
  hasHydrated: boolean;
  loading: boolean;
  error: string | null;
  setHasHydrated: (value: boolean) => void;
  register: (email: string, password: string, firstName: string, lastName: string) => Promise<boolean>;
  login: (email: string, password: string) => Promise<boolean>;
  logout: () => void;
  syncCustomer: () => Promise<void>;
}

async function postJson(url: string, body: unknown) {
  const response = await fetch(url, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(body),
  });
  return response.json();
}

function toCustomer(data: Record<string, unknown>): Customer {
  return {
    id: data.id as string,
    email: data.email as string,
    firstName: (data.firstName as string | null) ?? null,
    lastName: (data.lastName as string | null) ?? null,
  };
}

export const useCustomerStore = create<CustomerState>()(
  persist(
    (set, get) => ({
      token: null,
      customer: null,
      hasHydrated: false,
      loading: false,
      error: null,
      setHasHydrated: (value) => set({ hasHydrated: value }),

      register: async (email, password, firstName, lastName) => {
        set({ loading: true, error: null });
        const result = await postJson("/api/customer/register", { email, password, firstName, lastName });
        if (result.error) {
          set({ loading: false, error: result.error });
          return false;
        }
        set({ loading: false, token: result.token, customer: toCustomer(result) });
        return true;
      },

      login: async (email, password) => {
        set({ loading: true, error: null });
        const result = await postJson("/api/customer/login", { email, password });
        if (result.error) {
          set({ loading: false, error: result.error });
          return false;
        }
        set({ loading: false, token: result.token, customer: toCustomer(result) });
        return true;
      },

      logout: () => set({ token: null, customer: null, error: null }),

      // El token guardado en localStorage puede llevar dias o haber sido
      // revocado -- se refresca contra el servidor en vez de confiar en el
      // ultimo snapshot local.
      syncCustomer: async () => {
        const token = get().token;
        if (!token) return;
        try {
          const response = await fetch(`/api/customer/me?token=${encodeURIComponent(token)}`);
          if (!response.ok) {
            set({ token: null, customer: null });
            return;
          }
          const result = await response.json();
          if (result.id) set({ customer: toCustomer(result) });
        } catch {
          // Sin red: se queda con el ultimo estado local conocido.
        }
      },
    }),
    {
      name: "ari-shopping-customer-v1",
      storage: createJSONStorage(() => localStorage),
      partialize: (state) => ({ token: state.token, customer: state.customer }),
      onRehydrateStorage: () => (state) => {
        state?.setHasHydrated(true);
        void state?.syncCustomer();
      },
    },
  ),
);