<?php

namespace NoccyLabs\Hotfix\Hotfix;

use Symfony\Component\Yaml\Yaml;
use NoccyLabs\Hotfix\Exception\HotfixException;

class Header
{
    /**
     * @var string The name of the hotfix
     */
    protected $name;

    /**
     * @var string Information about this hotfix
     */
    protected $info;

    /**
     * @var string The author of the hotfix 
     */
    protected $author;

    /**
     * @var string The language this hotfix is written in, should match a runner.
     */ 
    protected $language;

    /** 
     * @var array A list of expressions to verify that the system is compatible
     *            with this fix 
     */
    protected $requirements;

    public function __construct($header)
    {
        $header = Yaml::parse($header);

        if (!(
            array_key_exists('hotfix', $header) &&
            array_key_exists('author', $header) &&
            array_key_exists('info', $header) &&
            array_key_exists('lang', $header)
        )) {
            throw new HotfixException("Invalid hotfix, header is missing hotfix, author, info or lang fields.");
        }

        $this->name = $header['hotfix'];
        $this->author = $header['author'];
        $this->info = $header['info'];
        $this->language = $header['lang'];

        if (array_key_exists('for', $header)) {
            $this->requirements = $header['for'];
        }
    }

    public function getName()
    {
        return $this->name;
    }

    public function getAuthor()
    {
        return $this->author;
    }

    public function getInfo()
    {
        return $this->info;
    }

    public function getLanguage()
    {
        return $this->language;
    }

    public function getRequirements()
    {
        return $this->requirements;
    }
}