<?php

namespace NoccyLabs\Hotfix\Hotfix;

use Symfony\Component\Yaml\Yaml;

class Hotfix
{

    protected $signer;

    protected $keyId;

    protected $header;
    
    protected $body;

    public function __construct($hotfix, $signer)
    {
        $this->load($hotfix);
        $this->signer = $signer[0];
        $this->keyId = $signer[1];
    }

    protected function load($hotfix)
    {
        if (strpos($hotfix, "\n---\n")===false) {
            throw new \Exception("Hotfix is missing a proper header, is line endings wrong?");
        }
        list ($header, $body) = explode("\n---\n", $hotfix, 2);
        $header = Yaml::parse($header);
        
        $this->header = $header;
        $this->body = $body;
    }

    public function getBody()
    {
        return $this->body;
    }

    public function apply()
    {
        if (!array_key_exists('lang', $this->header)) {
            $lang = 'bash';
        } else {
            $lang = strtolower($this->header['lang']);
        }
        
        $script = null;
        $head = null;
        $foot = null;
        switch ($lang) {
            case 'bash':
                $exec = "/bin/bash";
                $head = file_get_contents(__DIR__."/../stubs/bash.stub");
                break;
            case 'php':
                $exec = "/usr/bin/env php";
                $head = "<?php require_once \"".__DIR__."/../../vendor/autoload.php\"; ".file_get_contents(__DIR__."/../stubs/php.stub");
                break;
            default:
                fprintf(STDERR, "Error: Unsupported language %s\n", $lang);
                return;
        }
        $tmpfile = sys_get_temp_dir()."/hotfix_".sha1($this->header['hotfix']);

        file_put_contents($tmpfile, $head."\n".$this->body."\n".$foot);
        passthru($exec." ".$tmpfile);
        unlink($tmpfile);
    }

    public function getRequirements()
    {
        if (!array_key_exists('for',$this->header)) {
            return [];
        }
        return $this->header['for'];
    }

    public function getSignedBy()
    {
        if (!$this->signer) {
            return null;
        }
        return sprintf("%s <%s>", 
            $this->signer['uids'][0]['name'],
            $this->signer['uids'][0]['email']
        );
    }
    
    public function getKeyId()
    {
        return $this->keyId;
    }

    public function getName()
    {
        if (!array_key_exists('hotfix', $this->header)) {
            return "Untitled hotfix";
        }
        return $this->header['hotfix'];
    }
    
    public function getInfo()
    {
        if (!array_key_exists('info', $this->header)) {
            return "No additional information";
        }
        return $this->header['info'];
    }

    public function getAuthor()
    {
        if (!array_key_exists('author', $this->header)) {
            return "Unknown author";
        }
        return $this->header['author'];
    }

}