import { ErrorMessageTemplate } from "./types";

let template: ErrorMessageTemplate;
type MacroMap = { [macro: string]: string };

function createMacroMap(macro: string, value: any): MacroMap {
  const obj: any = {};
  obj[macro] = value;
  return obj;
}

export default {
  setTemplate(errorMessageTemplate: ErrorMessageTemplate) {
    template = errorMessageTemplate;
  },
  macroToValue(msg: string, macro: string, value: any): string {
    const reg = new RegExp(`{${macro}}`, "g");
    return msg.replace(reg, value);
  },
  get(name: string, templateData?: any): string {
    let msg = template[name];
    if (!msg)
      throw Error(`can't get the value of errorMessageTemplate['${name}']`);
    if (arguments.length === 1) return msg;
    if (typeof templateData !== "object")
      templateData = createMacroMap(name, templateData);
    for (let macro in templateData)
      msg = this.macroToValue(msg, macro, templateData[macro]);
    return msg;
  }
};