<?php

declare(strict_types=1);

namespace App;

/**
 * Represents and provides an interface for manipulating screens
 *
 * @author Adam Pippin <hello@adampippin.ca>
 */
class Screen
{
	/**
	 * A list of possible hardware outputs that could implement this screen
	 * @var string[]
	 */
	protected $_outputs;

	/**
	 * The driver for manipulating the layout
	 * @var ILayoutDriver
	 */
	protected $_driver;

	/**
	 * Set up a new screen
	 *
	 * @param string[] $outputs
	 * @param ILayoutDriver $driver
	 */
	public function __construct(array $outputs, ILayoutDriver $driver)
	{
		$this->_outputs = $outputs;
		$this->_driver = $driver;
	}

	/**
	 * Enumerate all possible outputs and return the first that is found to be connected
	 *
	 * @return string
	 */
	protected function getOutputName(): string
	{
		foreach ($this->_outputs as $output)
		{
			if ($this->_driver->isConnected($output))
			{
				return $output;
			}
		}

		throw new \Exception("No connected output found!");
	}

	/**
	 * Determine whether this screen is connected
	 *
	 * @return bool
	 */
	public function isConnected(): bool
	{
		try
		{
			$this->getOutputName();
			return true;
		}
		catch (\Exception $ex)
		{
			return false;
		}
	}

	/**
	 * Determine whether this screen is considered the "primary" screen
	 *
	 * @return bool
	 */
	public function isPrimary(): bool
	{
		return $this->_driver->isPrimary($this->getOutputName());
	}

	/**
	 * Get the pixel dimensions of the screen
	 *
	 * @return int[] x, y
	 */
	public function getDimensions(): array
	{
		return $this->_driver->getDimensions($this->getOutputName());
	}

	/**
	 * Get the pixel offset of the screen
	 *
	 * @return int[] x, y
	 */
	public function getOffset(): array
	{
		return $this->_driver->getOffset($this->getOutputName());
	}

	/**
	 * Set the pixel offset of the screen
	 *
	 * @param int $x
	 * @param int $y
	 * @return void
	 */
	public function setOffset(int $x, int $y): void
	{
		$this->_driver->setOffset($this->getOutputName(), $x, $y);
	}

	/**
	 * Set the resolution of the screen
	 *
	 * @param int $w
	 * @param int $h
	 * @return void
	 */
	public function setDimensions(int $w, int $h): void
	{
		$this->_driver->setDimensions($this->getOutputName(), $w, $h);
	}
}