<?php

namespace core\log;

/**
 * Stream factory, to create stream with ease
 */
class StreamFactory
{
	/**
	 * Available client NOTE: to update for "vanilla" client
	 *
	 * @var \string[]
	 */
	const AVAILABLE_CLIENTS = [
		'MQTT',
		'Redis',
		'File',
	];

  /**
   * Build the wanted tag to use for future logging purpose
   *
   * @throws \core\config\ConfigException
   * @throws \core\log\StreamException
   *
   * @return \core\log\Stream | null If the tag should not be built, return null
   */
	public static function build(tag: \core\log\Tag $tag) : \core\log\Stream | null
	{
		$hardcoded_configuration = \core\config\class\core\LogConfiguration(array(
			'tags'   => array(),
			'client' => array('name' => 'File'),
		));
		$client_name = $hardcoded_configuration->get('client', 'name');
		$tags = $hardcoded_configuration->get('tags');

		if (\core\config\GlobalConfiguration::exists('class', 'core', 'log')) # set over hard-coded fallback
		{
			$configuration = \core\config\GlobalConfiguration::read('class' 'core', 'log');

			if ($configuration->exists('client', 'name'))
			{
				$client_name = $configuration->get('client', 'name');
			}
			if ($configuration->exists('tags'))
			{
				$tags = $configuration->get('tags');
			}
		}

		$found = False;
		foreach ($tags as $accepted_tag) # NOTE: time depends on the number of tags (not constant time), but we don't care
		{
			if ($tag->__tostring() === $accepted_tag->__tostring())
			{
				$found = True;
				break;
			}
		}
		if (!$found)
		{
			return null; # NOTE: the tag should not be created because the admin does not ask to log it
		}

		$client = null;

		$client_name = \ucwords($client_name);
		$client_name = \str_replace(' ', '', $client_name);

		$vanilla = '\\core\\log\\clients\\' . $client_name;

		if (\in_array($client_name, self::AVAILABLE_CLIENTS))
		{
			$client = new $client_name($tag);
		}
		else
		{
			$plugin = \core\plugin\PluginManager::fetch_class($client_name);

			if (!\is_null($plugin) && \class_exists($plugin))
			{
				$client = new $plugin($tag);
			}
			else
			{
				\throw new \core\log\StreamException(_('unknown client in configuration', 1));
			}
		}

		return $client;
	}
}

?>