<?php

declare(strict_types=1);

namespace App\Commands\Stack;

use LaravelZero\Framework\Commands\Command;

/**
 * Read a file as input and perform all necessary compilation steps before
 * writing it to an output file.
 *
 * @author Adam Pippin <hello@adampippin.ca>
 */
class Compile extends Command
{
	/**
	 * The signature of the command.
	 *
	 * @var string
	 */
	protected $signature = 'stack:compile {in_file} {out_file} {--format=Yaml}';

	/**
	 * The description of the command.
	 *
	 * @var string
	 */
	protected $description = 'Read an input file, process, output result to a file';

	/**
	 * Execute the console command.
	 *
	 * @return void
	 */
	public function handle()
	{
		$engine = new \App\Engine\Engine();

		$serializer = $this->getSerializer();
		$unserializer = $this->getUnserializer();
		$engine->setSerializer($serializer)->setUnserializer($unserializer)->setCompiler(new \App\Engine\Cfnpp());

		$output = $engine->process($this->argument('in_file'), new \App\Engine\CfnppOptions());

		file_put_contents($this->argument('out_file'), $output);
	}

	/**
	 * Retrieve a serializer instance based on the format specified in the command options.
	 *
	 * @return \App\Serialize\ISerialize
	 */
	protected function getSerializer(): \App\Serialize\ISerialize
	{
		$format = $this->option('format');
		$class = '\\App\\Serialize\\'.$format;

		if (!class_exists($class))
		{
			throw new \Exception('Unknown formatter: '.$format);
		}

		return new $class();
	}

	/**
	 * Retrieve a unserializer instance based on the format specified in the command options.
	 *
	 * @return \App\Serialize\IUnserialize
	 */
	protected function getUnserializer(): \App\Serialize\IUnserialize
	{
		$format = $this->option('format');
		$class = '\\App\\Serialize\\'.$format;

		if (!class_exists($class))
		{
			throw new \Exception('Unknown formatter: '.$format);
		}

		return new $class();
	}
}