import { useAuthStore } from '../stores/authStore';
import type { LoginResponse, RegisterData, User } from '../stores/authStore';

const API_BASE_URL = process.env.EXPO_PUBLIC_API_URL ?? 'http://localhost:8000';

export const authService = {
  async login(email: string, password: string): Promise<LoginResponse> {
    const res = await fetch(`${API_BASE_URL}/api/auth/login`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ email, password }),
    });
    if (!res.ok) {
      const body = await res.json().catch(() => ({}));
      throw new Error(body.message ?? body.error ?? `Login failed (${res.status})`);
    }
    const data: LoginResponse = await res.json();
    // Sync with store
    useAuthStore.setState({
      user: data.user,
      accessToken: data.accessToken,
      refreshToken: data.refreshToken,
      isAuthenticated: true,
    });
    return data;
  },

  async register(data: RegisterData): Promise<LoginResponse> {
    const res = await fetch(`${API_BASE_URL}/api/auth/register`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(data),
    });
    if (!res.ok) {
      const body = await res.json().catch(() => ({}));
      throw new Error(body.message ?? body.error ?? `Registration failed (${res.status})`);
    }
    const result: LoginResponse = await res.json();
    useAuthStore.setState({
      user: result.user,
      accessToken: result.accessToken,
      refreshToken: result.refreshToken,
      isAuthenticated: true,
    });
    return result;
  },

  async logout(): Promise<void> {
    const { accessToken } = useAuthStore.getState();
    if (accessToken) {
      try {
        await fetch(`${API_BASE_URL}/api/auth/logout`, {
          method: 'POST',
          headers: {
            'Content-Type': 'application/json',
            Authorization: `Bearer ${accessToken}`,
          },
        });
      } catch { /* ignore */ }
    }
    useAuthStore.setState({
      user: null,
      accessToken: null,
      refreshToken: null,
      isAuthenticated: false,
    });
  },

  async refreshToken(): Promise<LoginResponse | null> {
    const { refreshToken } = useAuthStore.getState();
    if (!refreshToken) return null;
    const res = await fetch(`${API_BASE_URL}/api/auth/refresh`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ refreshToken }),
    });
    if (!res.ok) {
      useAuthStore.setState({
        user: null,
        accessToken: null,
        refreshToken: null,
        isAuthenticated: false,
        error: 'Session expired',
      });
      return null;
    }
    const data: LoginResponse = await res.json();
    useAuthStore.setState({
      user: data.user,
      accessToken: data.accessToken,
      refreshToken: data.refreshToken,
      isAuthenticated: true,
    });
    return data;
  },
};