<?php
namespace nulib\output;

use nulib\app\app;
use nulib\exceptions;
use nulib\output\std\NullMessenger;
use nulib\output\std\ProxyMessenger;

trait _TMessenger {
  protected static ?IMessenger $msg = null;

  static function set_messenger(IMessenger $msg, bool $replace=false): IMessenger {
    if (self::$msg instanceof NullMessenger) self::$msg = null;
    if ($replace || self::$msg === null) return self::$msg = $msg;
    elseif (self::$msg instanceof ProxyMessenger) self::$msg->addMessenger($msg);
    else self::$msg = new ProxyMessenger(self::$msg);
    return $msg;
  }

  static function get(): IMessenger {
    return self::$msg ??= new NullMessenger();
  }

  static function set_verbosity(string $verbosity): void {
    $msg = self::get();
    switch ($verbosity) {
    case "Q":
    case "silent":
      $msg->resetParams([
        "min_level" => self::NONE,
      ]);
      break;
    case "q":
    case "quiet":
      $msg->resetParams([
        "min_level" => self::MAJOR,
      ]);
      break;
    case "n":
    case "normal":
      $msg->resetParams([
        "min_level" => self::NORMAL,
      ]);
      break;
    case "v":
    case "verbose":
      $msg->resetParams([
        "min_level" => self::MINOR,
      ]);
      break;
    case "D":
    case "debug":
      app::set_debug();
      $msg->resetParams([
        "min_level" => self::DEBUG,
      ]);
      break;
    default:
      throw exceptions::forbidden_value($verbosity, "verbosity", ["silent", "quiet", "normal", "verbose", "debug"]);
    }
  }
}