import destr from "destr";
import { snakeCase } from "scule";
export function getEnv(key, opts) {
  const envKey = snakeCase(key).toUpperCase();
  return destr(
    process.env[opts.prefix + envKey] ?? process.env[opts.altPrefix + envKey]
  );
}
function _isObject(input) {
  return typeof input === "object" && !Array.isArray(input);
}
export function applyEnv(obj, opts, parentKey = "") {
  for (const key in obj) {
    const subKey = parentKey ? `${parentKey}_${key}` : key;
    const envValue = getEnv(subKey, opts);
    if (_isObject(obj[key])) {
      if (_isObject(envValue)) {
        obj[key] = { ...obj[key], ...envValue };
        applyEnv(obj[key], opts, subKey);
      } else if (envValue === void 0) {
        applyEnv(obj[key], opts, subKey);
      } else {
        obj[key] = envValue ?? obj[key];
      }
    } else {
      obj[key] = envValue ?? obj[key];
    }
    if (opts.envExpansion && typeof obj[key] === "string") {
      obj[key] = _expandFromEnv(obj[key]);
    }
  }
  return obj;
}
const envExpandRx = /\{\{([^{}]*)\}\}/g;
function _expandFromEnv(value) {
  return value.replace(envExpandRx, (match, key) => {
    return process.env[key] || match;
  });
}