import { ObjectCreate, ObjectFreeze } from "ext:core/primordials";
import {
  op_env_delete,
  op_env_get,
  op_env_set,
  op_env_to_object,
} from "ext:core/ops";
import { required, usv } from "ext:web/idl.js";
import { result } from "ext:file/errors.js";

export const env = ObjectFreeze({
  get(name: unknown) {
    required(arguments.length, 1);
    return result(op_env_get(usv(name))) ?? undefined;
  },
  has(name: unknown) {
    required(arguments.length, 1);
    return result(op_env_get(usv(name))) !== null;
  },
  set(name: unknown, value: unknown) {
    required(arguments.length, 2);
    result(op_env_set([usv(name), usv(value)]));
  },
  delete(name: unknown) {
    required(arguments.length, 1);
    result(op_env_delete(usv(name)));
  },
  toObject() {
    const entries = op_env_to_object();
    const snapshot: Record<string, string> = ObjectCreate(null);
    for (let index = 0; index < entries.length; index++) {
      snapshot[entries[index][0]] = entries[index][1];
    }
    return snapshot;
  },
});