<?php

namespace Qs\SecurePaymentSystems;

use Qs_Options;

abstract class Packet
{
    const MODIFIER_PURCHASE = 10;
    const MODIFIER_VOID     = 20;

    const FIELD_SEPARATOR  = "\x1C";
    const STRING_SEPARATOR = ">";
    const STX              = "\x02";
    const ETX              = "\x03";

    protected $type = 2010;
    protected $modifierCode;
    protected $localTransactionTime;
    protected $tid;
    protected $xmlData = [];

    public function __construct(array $options = [])
    {
        Qs_Options::setOptions($this, $options);
    }

    public function getType()
    {
        return $this->type;
    }

    public function setType($type)
    {
        $this->type = $type;
        return $this;
    }

    public function getModifierCode()
    {
        return $this->modifierCode;
    }

    public function setModifierCode($modifierCode)
    {
        $this->modifierCode = $modifierCode;
        return $this;
    }

    public function getLocalTransactionTime()
    {
        if (null === $this->localTransactionTime) {
            $this->localTransactionTime = time();
        }
        return $this->localTransactionTime;
    }

    /**
     * @param int $time
     * @return $this
     */
    public function setLocalTransactionTime($time)
    {
        $this->localTransactionTime = $time;
        return $this;
    }

    public function getTid()
    {
        return $this->tid;
    }

    public function setTid($tid)
    {
        $this->tid = $tid;
        return $this;
    }

    abstract public function toArray();

    public function __toString()
    {
        return implode(self::STRING_SEPARATOR, $this->toArray());
    }

    public function toBinary()
    {
        return "\x02" . implode(self::FIELD_SEPARATOR, $this->toArray()) . "\x03";
    }

    protected function renderXmlData()
    {
        $xml = '';
        foreach ($this->xmlData as $field => $value) {
            $xml .= "[{$field}]{$value}[/{$field}]";
        }
        return $xml;
    }

    public function getXmlData()
    {
        return $this->xmlData;
    }

    public function setXmlData($xmlData)
    {
        $this->xmlData = $xmlData;
        return $this;
    }

    public function mask($string, $context = null, $showLastDigits = null)
    {
        if (null === $context) {
            $context = $string;
        }
        if (null !== $showLastDigits) {
            $replacement = str_repeat('X', strlen($string) - $showLastDigits) . substr($string, -1 * $showLastDigits);
        } else {
            $replacement = str_repeat('X', strlen($string));
        }
        return str_replace($string, $replacement, $context);
    }
}