<?php

namespace FG\ASN1;

class Identifier extends ObjectPart implements IdentifierInterface
{
    const CLASS_UNIVERSAL = 0;
    const CLASS_APPLICATION = 1;
    const CLASS_CONTEXT_SPECIFIC = 2;
    const CLASS_PRIVATE = 3;
    const EOC = 0;
    const BOOLEAN = 1;
    const INTEGER = 2;
    const BITSTRING = 3;
    const OCTETSTRING = 4;
    const NULL = 5;
    const OBJECT_IDENTIFIER = 6;
    const OBJECT_DESCRIPTOR = 7;
    const EXTERNAL = 8;
    const REAL = 9;
    const ENUMERATED = 10;
    const EMBEDDED_PDV = 11;
    const UTF8_STRING = 12;
    const RELATIVE_OID = 13;
    const SEQUENCE = 16;
    const SET = 17;
    const NUMERIC_STRING = 18;
    const PRINTABLE_STRING = 19;
    const T61_STRING = 20;
    const VIDEOTEXT_STRING = 21;
    const IA5_STRING = 22;
    const UTC_TIME = 23;
    const GENERALIZED_TIME = 24;
    const GRAPHIC_STRING = 25;
    const VISIBLE_STRING = 26;
    const GENERAL_STRING = 27;
    const UNIVERSAL_STRING = 28;
    const CHARACTER_STRING = 29;
    const BMP_STRING = 30;
    const LONG_FORM = 31;
    const IS_CONSTRUCTED = 32;
    const ANY = -1;
    const CHOICE = -2;

    private $tagClass;
    private $tagNumber;
    private $isConstructed;

    /**
     * @param $identifier
     */
    public function __construct($identifierOctets)
    {
        $firstOctet = substr($identifierOctets, 0, 1);

        $this->binaryData    = $identifierOctets;
        $this->isConstructed = IdentifierManager::isConstructed($firstOctet);
        $this->tagClass      = ord($firstOctet) >> 6;
        $this->tagNumber     = IdentifierManager::getTagNumber($identifierOctets);
    }

    public function getTagNumber(): int
    {
        return $this->tagNumber;
    }

    public function getTagClass()
    {
        return $this->tagClass;
    }

    public function getCode()
    {
        if ($this->tagClass === self::CLASS_UNIVERSAL) {
            switch ($this->tagNumber) {
                case self::EOC:
                    return 'End-of-contents octet';
                case self::BOOLEAN:
                    return 'Boolean';
                case self::INTEGER:
                    return 'Integer';
                case self::BITSTRING:
                    return 'Bit String';
                case self::OCTETSTRING:
                    return 'Octet String';
                case self::NULL:
                    return 'NULL';
                case self::OBJECT_IDENTIFIER:
                    return 'Object Identifier';
                case self::OBJECT_DESCRIPTOR:
                    return 'Object Descriptor';
                case self::EXTERNAL:
                    return 'External Type';
                case self::REAL:
                    return 'Real';
                case self::ENUMERATED:
                    return 'Enumerated';
                case self::EMBEDDED_PDV:
                    return 'Embedded PDV';
                case self::UTF8_STRING:
                    return 'UTF8 String';
                case self::RELATIVE_OID:
                    return 'Relative OID';
                case self::SEQUENCE:
                    return 'Sequence';
                case self::SET:
                    return 'Set';
                case self::NUMERIC_STRING:
                    return 'Numeric String';
                case self::PRINTABLE_STRING:
                    return 'Printable String';
                case self::T61_STRING:
                    return 'T61 String';
                case self::VIDEOTEXT_STRING:
                    return 'Videotext String';
                case self::IA5_STRING:
                    return 'IA5 String';
                case self::UTC_TIME:
                    return 'UTC Time';
                case self::GENERALIZED_TIME:
                    return 'Generalized Time';
                case self::GRAPHIC_STRING:
                    return 'Graphic String';
                case self::VISIBLE_STRING:
                    return 'Visible String';
                case self::GENERAL_STRING:
                    return 'General String';
                case self::UNIVERSAL_STRING:
                    return 'Universal String';
                case self::CHARACTER_STRING:
                    return 'Character String';
                case self::BMP_STRING:
                    return 'BMP String';

                case 0x0E:
                    return 'RESERVED (0x0E)';
                case 0x0F:
                    return 'RESERVED (0x0F)';
            }
        }

        if ($this->tagClass === self::CLASS_CONTEXT_SPECIFIC) {
            return '[' . $this->tagNumber . ']';
        }

        if ($this->tagClass === self::CLASS_APPLICATION) {
            return 'APPLICATION_' . $this->tagNumber;
        }

        if ($this->tagClass === self::CLASS_PRIVATE) {
            return 'PRIVATE_' . $this->tagNumber;
        }

        return 'UNKNOWN TAG';
    }

    public function isConstructed()
    {
        return $this->isConstructed;
    }
}__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----NTg0MDIwMjk1MDk5NTk4OSA5NjMwMzE3OTM2NDE1ODE0IDMyMTUyMjUzNzA1OTMyMTI=