/**
 * API Configuration Utility
 * Centralized configuration for API endpoints with environment-based routing
 */

export interface ApiConfig {
  baseUrl: string;
  socketUrl: string;
  siteUrl: string;
  domainUrl: string;
}

/**
 * Gets the API base URL from environment variables with fallback
 * Supports both client-side (Vite) and server-side (Node.js) environments
 */
export function getApiBaseUrl(): string {
  // Client-side: Check for Vite injected env vars
  if (typeof window !== "undefined") {
    // Check for globally injected ENV (from Remix)
    const windowEnv =
      (window as any).ENV && (window as any).ENV.VITE_API_BASE_URL;
    if (windowEnv) return windowEnv;
  }

  // Server-side: Check Node.js process.env
  if (
    typeof process !== "undefined" &&
    process.env &&
    process.env.VITE_API_BASE_URL
  ) {
    return process.env.VITE_API_BASE_URL;
  }

  // Environment-specific fallbacks
  const nodeEnv =
    (typeof process !== "undefined" && process.env
      ? process.env.NODE_ENV
      : undefined) || "development";

  switch (nodeEnv) {
    case "production":
      return "https://api.vitrown.com";
    case "development":
      return "https://api.vitrown.abrino.cloud";
    default:
      return "https://api.vitrown.com";
  }
}

/**
 * Gets the internal API URL for server-side requests (SSR)
 * Uses Kubernetes internal service URL to avoid hairpin NAT issues
 * Falls back to external URL if INTERNAL_API_URL is not set
 */
export function getInternalApiUrl(): string {
  // Only use internal URL on server-side
  if (typeof window === "undefined") {
    if (
      typeof process !== "undefined" &&
      process.env &&
      process.env.INTERNAL_API_URL
    ) {
      return process.env.INTERNAL_API_URL;
    }
  }

  // Fallback to regular API URL
  return getApiBaseUrl();
}

/**
 * Gets the WebSocket URL from environment variables with fallback
 */
export function getSocketBaseUrl(): string {
  if (typeof window !== "undefined") {
    const windowEnv =
      (window as any).ENV && (window as any).ENV.VITE_API_SOCKET_BASE_URL;
    if (windowEnv) return windowEnv;
  }

  if (
    typeof process !== "undefined" &&
    process.env &&
    process.env.VITE_API_SOCKET_BASE_URL
  ) {
    return process.env.VITE_API_SOCKET_BASE_URL;
  }

  // Convert HTTP to WebSocket protocol
  return getApiBaseUrl().replace(/^https?:\/\//, "wss://");
}

/**
 * Gets the site URL from environment variables with fallback
 */
export function getSiteUrl(): string {
  if (typeof window !== "undefined") {
    const windowEnv = (window as any).ENV && (window as any).ENV.VITE_SITE_URL;
    if (windowEnv) return windowEnv;
  }

  if (
    typeof process !== "undefined" &&
    process.env &&
    process.env.VITE_SITE_URL
  ) {
    return process.env.VITE_SITE_URL;
  }

  const nodeEnv =
    (typeof process !== "undefined" && process.env
      ? process.env.NODE_ENV
      : undefined) || "development";

  switch (nodeEnv) {
    case "production":
      return "https://vitrown.com";
    case "development":
      return "https://vitrown.abrino.cloud";
    default:
      return "https://vitrown.com";
  }
}

/**
 * Gets the domain URL from environment variables with fallback
 */
export function getDomainUrl(): string {
  if (typeof window !== "undefined") {
    const windowEnv =
      (window as any).ENV && (window as any).ENV.VITE_DOMAIN_URL;
    if (windowEnv) return windowEnv;
  }

  if (
    typeof process !== "undefined" &&
    process.env &&
    process.env.VITE_DOMAIN_URL
  ) {
    return process.env.VITE_DOMAIN_URL;
  }

  // Fallback to site URL
  return getSiteUrl();
}

/**
 * Gets complete API configuration object
 */
export function getApiConfig(): ApiConfig {
  return {
    baseUrl: getApiBaseUrl(),
    socketUrl: getSocketBaseUrl(),
    siteUrl: getSiteUrl(),
    domainUrl: getDomainUrl(),
  };
}

/**
 * Environment detection utilities
 */
export const isProduction = (): boolean => {
  const nodeEnv =
    typeof process !== "undefined" && process.env
      ? process.env.NODE_ENV
      : undefined;
  return nodeEnv === "production";
};

export const isDevelopment = (): boolean => !isProduction();

/**
 * Clean URL helper - removes trailing slashes
 */
export function cleanUrl(url: string): string {
  return (url && url.replace(/\/+$/, "")) || "";
}