<?php

declare(strict_types=1);

namespace App;

use Symfony\Component\Yaml\Yaml;

/**
 * Represent the configuration containing screens and layouts
 * 
 * @author Adam Pippin <hello@adampippin.ca>
 */
class Configuration
{
	/**
	 * Represents the available screens and their configuration
	 * @var array<string, Screen>
	 */
	protected $_screens;

	/**
	 * Represents the available layouts
	 * @var array<string, Layout>
	 */
	protected $_layouts;

	/**
	 * Initialize an empty config
	 */
	public function __construct()
	{
		$this->_screens = [];
		$this->_layouts = [];
	}

	/**
	 * Load a configuration from a YAML file
	 *
	 * @param string $file
	 * @return void
	 */
	public function load(string $file): void
	{
		$config = Yaml::parseFile($file);

		foreach ($config['screens'] as $screen_name => $screen)
		{
			$this->_screens[$screen_name] = app()->make(\App\Screen::class, [
				'outputs' => is_array($screen['output']) ? $screen['output'] : [$screen['output']]
			]);
		}

		foreach ($config['layouts'] as $layout => $data)
		{
			$this->_layouts[$layout] = app()->make(\App\Layout::class, ['screens' => $data['screens'], 'links' => $data['links']]);
		}
	}

	/**
	 * Fetch a specific screen
	 *
	 * @param string $screen_name
	 * @return Screen
	 */
	public function getScreen(string $screen_name): Screen
	{
		return $this->_screens[$screen_name];
	}

	/**
	 * Fetch the primary screen
	 *
	 * @return Screen
	 */
	public function getPrimaryScreen(): Screen
	{
		return $this->getScreen($this->getPrimaryScreenName());
	}

	/**
	 * Fetch the name of the primary screen
	 *
	 * @return string
	 */
	public function getPrimaryScreenName(): string
	{
		foreach ($this->_screens as $name => $screen)
		{
			if ($screen->isPrimary())
			{
				return $name;
			}
		}

		throw new \Exception("No primary screen found");
	}

	/**
	 * Fetch a specific layout
	 *
	 * @param string $layout
	 * @return Layout
	 */
	public function getLayout(string $layout): Layout
	{
		return $this->_layouts[$layout];
	}

	/**
	 * Fetch all the layouts
	 *
	 * @return array<string, Layout>
	 */
	public function getLayouts(): array
	{
		return $this->_layouts;
	}
}