<?php
namespace XaiCorp\AbcParser\Domain\Modules\Interpreter\Lexicon;

use Closure;
use XaiCorp\AbcParser\Domain\Core\TuneBuilder;
use XaiCorp\AbcParser\Domain\Modules\Interpreter\Context;

class EndOfTune implements Lex
{
    use LineKeyDataTrait;

    /**
     * @var TuneBuilder
     */
    protected $builder;

    public function __construct(TuneBuilder $builder)
    {
        $this->builder = $builder;
    }

    /**
     * @param Context $context
     * @param \Closure $next
     * @return mixed
     * @throws \Enzyme\Axiom\Exceptions\AtomException
     */
    public function handle(Context $context, Closure $next)
    {
        $line = $context->current();
//        list($key, $data) = $this->getKeyDataFromLine($line);

        if ($this->isEndOfFile($context) || $this->isEndOfMusic($context, $line)) {
            $this->builder->handleEndOfMusic();
        }

        return $next($context);
    }

    protected function isEndOfFile(Context $context)
    {
        $key = $context->key();
        return $context->count() <= $key+1;
    }

    private function isEndOfMusic(Context $context, string $line)
    {
        return $context->isState(Context::MODE_TUNE_BODY)
            && preg_match('/^\s*$/', $line);
    }

}