module.exports = class DBG {
  /**
   * @param ${'none'|'warn'|'info'|'debug'|'nitpick'} [level='info']
   **/
  constructor(level = 'info') {
    this.setLevel(level);
  }

  _levels = ['nitpick', 'debug', 'info', 'warn', 'none'];

  setLevel(level) {
    if (this._levels.includes(level)) {
      this._level = level;
    } else {
      throw new Error(`'${level}' is not a valid debug level`);
    }
  }

  /** @param {any} s **/
  warn = (s='', ...z) => {
    if (this._lvl2num('warn') < this._lvl2num(this._level)) return
    console.log(s, ...z);
  }
  /** @param {any} s **/
  i = (s='', ...z) => {
    if (this._lvl2num('info') < this._lvl2num(this._level)) return
    console.log(s, ...z);
  }
  /** @param {any} s **/
  d = (s='', ...z) => {
    if (this._lvl2num('debug') < this._lvl2num(this._level)) return
    console.log(s, ...z);
  }
  /** @param {any} s **/
  nit = (s='', ...z) => {
    if (this._lvl2num('nitpick') < this._lvl2num(this._level)) return
    console.log(s, ...z);
  }

  warnGroup = (s) => {
    if (this._lvl2num('warn') < this._lvl2num(this._level)) return
    console.group(s);
  }
  infoGroup = (s) => {
    if (this._lvl2num('info') < this._lvl2num(this._level)) return
    console.group(s);
  }
  debugGroup = (s) => {
    if (this._lvl2num('debug') < this._lvl2num(this._level)) return
    console.group(s);
  }
  nitGroup = (s) => {
    if (this._lvl2num('nit') < this._lvl2num(this._level)) return
    console.group(s);
  }

  warnGroupEnd = (s) => {
    if (this._lvl2num('warn') < this._lvl2num(this._level)) return
    console.groupEnd();
  }
  infoGroupEnd = (s) => {
    if (this._lvl2num('info') < this._lvl2num(this._level)) return
    console.group();
  }
  debugGroupEnd = (s) => {
    if (this._lvl2num('debug') < this._lvl2num(this._level)) return
    console.group();
  }
  nitGroupEnd = (s) => {
    if (this._lvl2num('nit') < this._lvl2num(this._level)) return
    console.group();
  }

  warnExec = (fn) => {
    if (this._lvl2num('warn') < this._lvl2num(this._level)) return
    fn();
  }
  infoExec = (fn) => {
    if (this._lvl2num('info') < this._lvl2num(this._level)) return
    fn();
  }
  debugExec = (fn) => {
    if (this._lvl2num('debug') < this._lvl2num(this._level)) return
    fn();
  }
  nitExec = (fn) => {
    if (this._lvl2num('nit') < this._lvl2num(this._level)) return
    fn();
  }

  _lvl2num(lvl) {
    return 1 + this._levels.findIndex(l => l === lvl);
  }
}

/* TEST
const dbg = new DBG('nitpick');
dbg.warnGroup('w');
dbg.warn('warn');
dbg.warnGroupEnd();

dbg.iGroup('i');
dbg.i('info');
dbg.iGroupEnd();

dbg.dGroup('d');
dbg.d('debug');
dbg.dGroupEnd();

dbg.nitGroup('n');
dbg.nit('nitpick');
dbg.nitGroupEnd();
*/