import { isArray } from "util";

export default function(input: string | string[]) {
  let matched: boolean = false; // temporary workaround
  input = isArray(input) ? input.join(" ") : input;
  const options: any = {},
    command = input
      .match(/^[a-zA-Z0-9\s.\/]*/gim)
      .join(" ")
      .trim()
      .toLowerCase();
  input
    // filter out the options and flags, put them into an object
    .match(/--(\w+)\s([a-zA-Z0-9:\/.\s\"~]+)|-(\w+)/gim)
    .forEach(function(part) {
      const parts = part.split(" ").slice(0),
        name = parts.shift().replace(/-/g, "");
      let value = parts.join(" ").trim();
      try {
        value = JSON.parse(value);
      } catch (exception) {}
      options[name] = value || true;
    });
  /** Get all options **/
  function getOptions(): any {
    return options;
  }
  /** Get a specific option. **/
  function getOption(key: string): any {
    return options[key];
  }
  /** Get the full command. **/
  function getCommand(): string {
    return command;
  }
  function on(command: string, callback: (options?: any) => void) {
    command = !command ? "" : command;
    // match against the command
    if (!matched && command.includes(command.toLowerCase())) {
      matched = true;
      callback(options);
    }
    return;
  }
  return {
    getOption,
    getOptions,
    getCommand,
    on
  };
}