<?php /* Copyright (c) 2024 Freya Murphy */

/**
 * Gives access to imporant
 * needed utility functions for
 * accessing everything else!
 */
abstract class Component extends Core {

	// keep track of what has been loaded
	private static array $loaded = array();

// ============================= LOADABLE OBJECTS ==

	/**
	 * Loads a $type of object from a $dir with a given $name
	 * @param string $name - the name of the object to load
	 * @param string $dir - the directory theese objects are stored in
	 * @param string $type - the type of the object
	 */
	private function load_type($name, $dir, $type): object|NULL
	{

		$path = $dir . '/' . $name . '.php';

		// dont reload an ohject
		if (array_key_exists($path, Component::$loaded))
			return Component::$loaded[$path];

		// only load a object if it exists
		if (!file_exists($path))
			return NULL;


		$parts = explode('/', $name);
		$part = end($parts);
		$class = ucfirst($part) . '_' . $type;
		require($path);

		$ref = NULL;
		try {
			$ref = new ReflectionClass($class);
		} catch (Exception $_e) {}

		if ($ref === NULL)
			return NULL;

		$obj = $ref->newInstance();
		Component::$loaded[$path] = $obj;

		return $obj;
	}

	/**
	 * Loads a model
	 * @param string $name - the name of the model to load
	 */
	protected function load_model($name): Model|NULL
	{
		$dir = WEB_ROOT . '/_model';
		return $this->load_type($name, $dir, 'model');
	}

	/**
	 * Loads a controller
	 * @param string $name - the name of the controller to load
	 */
	public function load_controller($name): Controller|NULL
	{
		$dir = WEB_ROOT . '/_controller';
		return $this->load_type($name, $dir, 'controller');
	}

// ========================================= LANG ==

	/**
	 * Loads a php lang file into the lang array
	 */
	private static function load_lang_file(string $file): void
	{
		$lang = $GLOBALS['__lang'];
		require($file);
		$GLOBALS['__lang'] = $lang;
	}

	/**
	 * Loads each php file lang strings in a directory
	 */
	private static function load_lang_dir(string $dir): void
	{
		if ($handle = opendir($dir)) {
			while (false !== ($entry = readdir($handle))) {
				if ($entry === '.' || $entry === '..')
					continue;
				Component::load_lang_file($entry);
			}
		}
	}

	/**
	 * Loads the given common lang
	 */
	protected static function load_lang(string ...$langs): void
	{
		$root = WEB_ROOT . '/lang';

		foreach ($langs as $lang) {
			$file = "{$root}/{$lang}.php";
			$dir = "{$root}/{$lang}";

			if (file_exists($file))
				Component::load_lang_file($file);
			else if (is_dir($dir))
				Component::load_lang_dir($dir);

		}
	}

}