const API_URL = 'http://localhost:8080/api';

class ApiError extends Error {
  constructor(message, status, data) {
    super(message);
    this.name = 'ApiError';
    this.status = status;
    this.data = data;
  }
}

async function fetchAPI(endpoint, options = {}) {
  const url = `${API_URL}${endpoint}`;

  const config = {
    ...options,
    headers: {
      'Content-Type': 'application/json',
      ...options.headers,
    },
  };

  // Add auth token if available
  const token = localStorage.getItem('token');
  if (token) {
    config.headers['Authorization'] = `Bearer ${token}`;
  }

  try {
    const response = await fetch(url, config);
    const data = await response.json();

    if (!response.ok) {
      throw new ApiError(
        data.error || 'API request failed',
        response.status,
        data
      );
    }

    return data;
  } catch (error) {
    if (error instanceof ApiError) {
      throw error;
    }
    throw new ApiError('Network error', 0, { message: error.message });
  }
}

// Auth API
export const authAPI = {
  async register(username, email, password) {
    const data = await fetchAPI('/auth/register', {
      method: 'POST',
      body: JSON.stringify({ username, email, password }),
    });

    // Save token
    if (data.data.token) {
      localStorage.setItem('token', data.data.token);
    }

    return data.data;
  },

  async login(email, password) {
    const data = await fetchAPI('/auth/login', {
      method: 'POST',
      body: JSON.stringify({ email, password }),
    });

    // Save token
    if (data.data.token) {
      localStorage.setItem('token', data.data.token);
    }

    return data.data;
  },

  async getCurrentUser() {
    const data = await fetchAPI('/users/me');
    return data.data;
  },

  logout() {
    localStorage.removeItem('token');
    localStorage.removeItem('user');
  },
};

// Events API
export const eventsAPI = {
  async getAll() {
    const data = await fetchAPI('/events');
    return data.data;
  },

  async getById(id) {
    const data = await fetchAPI(`/events/${id}`);
    return data.data;
  },
};

export { ApiError };