import Constants from "expo-constants";

const fallbackUrl = "http://localhost:3000";

let runtimeOverride: string | null = null;

export function setRuntimeApiUrl(url: string | null) {
  runtimeOverride = url?.replace(/\/$/, "") ?? null;
}

export function getApiUrl() {
  if (runtimeOverride) return runtimeOverride;

  const fromEnv = process.env.EXPO_PUBLIC_API_URL?.trim();
  if (fromEnv) return fromEnv.replace(/\/$/, "");

  const hostUri = Constants.expoConfig?.hostUri;
  if (hostUri) {
    const host = hostUri.split(":")[0];
    if (host) return `http://${host}:3000`;
  }

  return fallbackUrl;
}