// API service configuration and base client
import { useAuth } from '@clerk/clerk-react';

const API_BASE_URL = import.meta.env.VITE_API_BASE_URL || 'http://localhost:3005/api';

// Export function to get the base URL without /api suffix for static assets
export const getApiBaseUrl = () => {
  return (import.meta.env.VITE_API_BASE_URL || 'http://localhost:3005/api').replace('/api', '');
};

export interface ApiError {
  code: string;
  message: string;
  details?: any;
  timestamp: string;
}

export class ApiClient {
  private baseUrl: string;
  private getToken?: () => Promise<string | null>;

  constructor(baseUrl: string = API_BASE_URL) {
    this.baseUrl = baseUrl;
  }

  setTokenGetter(getToken: () => Promise<string | null>) {
    this.getToken = getToken;
  }

  private async request<T>(
    endpoint: string,
    options: RequestInit = {}
  ): Promise<T> {
    const url = `${this.baseUrl}${endpoint}`;
    
    // Get auth token if available
    const token = this.getToken ? await this.getToken() : null;
    
    const response = await fetch(url, {
      ...options,
      headers: {
        'Content-Type': 'application/json',
        ...(token ? { Authorization: `Bearer ${token}` } : {}),
        ...options.headers,
      },
    });

    if (!response.ok) {
      let error: ApiError;
      try {
        error = await response.json();
      } catch {
        // If response is not JSON, create a generic error
        throw new Error(`HTTP ${response.status}: ${response.statusText}`);
      }
      throw new Error(error.message || 'An error occurred');
    }

    // Handle empty responses (like DELETE)
    const contentType = response.headers.get('content-type');
    if (contentType && contentType.includes('application/json')) {
      return response.json();
    }
    
    // For non-JSON responses, return empty object
    return {} as T;
  }

  async get<T>(endpoint: string, options?: RequestInit): Promise<T> {
    return this.request<T>(endpoint, { ...options, method: 'GET' });
  }

  async post<T>(endpoint: string, data?: any, options?: RequestInit): Promise<T> {
    return this.request<T>(endpoint, {
      ...options,
      method: 'POST',
      body: JSON.stringify(data),
    });
  }

  async patch<T>(endpoint: string, data?: any, options?: RequestInit): Promise<T> {
    return this.request<T>(endpoint, {
      ...options,
      method: 'PATCH',
      body: JSON.stringify(data),
    });
  }

  async delete<T>(endpoint: string, options?: RequestInit): Promise<T> {
    return this.request<T>(endpoint, { ...options, method: 'DELETE' });
  }
}

export const apiClient = new ApiClient();