<?php

declare(strict_types=1);

namespace App;

/**
 * Main logic for actually doing things with the passed in config
 *
 * @author Adam Pippin <hello@adampippin.ca>
 */
class Engine
{
	/**
	 * The configuration laying out the screens and layouts we're trying to implement
	 * @var Configuration
	 */
	protected $_config;
	/**
	 * The driver to allow us to manipulate display offsets/dimensions/etc
	 * @var ILayoutDriver
	 */
	protected $_driver;

	/**
	 * Set up the engine
	 * @param Configuration $config
	 * @param ILayoutDriver $driver
	 */
	public function __construct(\App\Configuration $config, \App\ILayoutDriver $driver)
	{
		$this->_config = $config;
		$this->_driver = $driver;
	}

	/**
	 * Perform a layout
	 *
	 * @return void
	 */
	public function layout(): void
	{
		foreach ($this->_config->getLayouts() as $layout_name => $layout)
		{
			$screens = $layout->getScreenNames();
			$all_screens = true;
			foreach ($screens as $screen_name)
			{
				if (!$this->_config->getScreen($screen_name)->isConnected())
				{
					$all_screens = false;
					break;
				}
			}
			if (!$all_screens)
			{
				continue;
			}

			$layout->execute($this->_config, $this->_driver);
			break;
		}
	}
}