type LogLevel = 'debug' | 'info' | 'warn' | 'error';

class LoggerImpl {
  private enabled = false;
  private tag = 'TLRN';

  init(options?: { enabled?: boolean; tag?: string }) {
    if (typeof options?.enabled === 'boolean') this.enabled = options.enabled;
    if (options?.tag) this.tag = options.tag;
  }

  setEnabled(enabled: boolean) { this.enabled = enabled; }
  setTag(tag: string) { this.tag = tag; }

  private format(level: LogLevel, message?: any, ...optional: any[]) {
    const prefix = `🎯 ${this.tag} [${level.toUpperCase()}]`;
    return [prefix, message, ...optional];
  }

  debug(message?: any, ...optional: any[]) {
    if (!this.enabled) return;
    // eslint-disable-next-line no-console
    console.log(...this.format('debug', message, ...optional));
  }

  info(message?: any, ...optional: any[]) {
    if (!this.enabled) return;
    // eslint-disable-next-line no-console
    console.log(...this.format('info', message, ...optional));
  }

  warn(message?: any, ...optional: any[]) {
    // eslint-disable-next-line no-console
    console.warn(...this.format('warn', message, ...optional));
  }

  error(message?: any, ...optional: any[]) {
    // eslint-disable-next-line no-console
    console.error(...this.format('error', message, ...optional));
  }

  withTag(tag: string) {
    const child = new LoggerImpl();
    child.init({ enabled: this.enabled, tag: `${this.tag}:${tag}` });
    return child;
  }
}

export const Logger = new LoggerImpl();