<?php
/**
 * This file is part of FPDI
 *
 * @package   setasign\Fpdi
 * @copyright Copyright (c) 2019 Setasign - Jan Slabon (https://www.setasign.com)
 * @license   http://opensource.org/licenses/mit-license The MIT License
 */

namespace setasign\Fpdi\PdfParser\Type;

use setasign\Fpdi\PdfParser\PdfParser;
use setasign\Fpdi\PdfParser\StreamReader;
use setasign\Fpdi\PdfParser\Tokenizer;

/**
 * Class representing an indirect object
 *
 * @package setasign\Fpdi\PdfParser\Type
 */
class PdfIndirectObject extends PdfType
{
    /**
     * Parses an indirect object from a tokenizer, parser and stream-reader.
     *
     * @param int $objectNumberToken
     * @param int $objectGenerationNumberToken
     * @param PdfParser $parser
     * @param Tokenizer $tokenizer
     * @param StreamReader $reader
     * @return bool|self
     * @throws PdfTypeException
     */
    public static function parse(
        $objectNumberToken,
        $objectGenerationNumberToken,
        PdfParser $parser,
        Tokenizer $tokenizer,
        StreamReader $reader
    ) {
        $value = $parser->readValue();
        if ($value === false) {
            return false;
        }

        $nextToken = $tokenizer->getNextToken();
        if ($nextToken === 'stream') {
            $value = PdfStream::parse($value, $reader, $parser);
        } elseif ($nextToken !== false) {
            $tokenizer->pushStack($nextToken);
        }

        $v = new self;
        $v->objectNumber = (int) $objectNumberToken;
        $v->generationNumber = (int) $objectGenerationNumberToken;
        $v->value = $value;

        return $v;
    }

    /**
     * Helper method to create an instance.
     *
     * @param int $objectNumber
     * @param int $generationNumber
     * @param PdfType $value
     * @return self
     */
    public static function create($objectNumber, $generationNumber, PdfType $value)
    {
        $v = new self;
        $v->objectNumber = (int) $objectNumber;
        $v->generationNumber = (int) $generationNumber;
        $v->value = $value;

        return $v;
    }

    /**
     * Ensures that the passed value is a PdfIndirectObject instance.
     *
     * @param mixed $indirectObject
     * @return self
     * @throws PdfTypeException
     */
    public static function ensure($indirectObject)
    {
        return PdfType::ensureType(self::class, $indirectObject, 'Indirect object expected.');
    }

    /**
     * The object number.
     *
     * @var int
     */
    public $objectNumber;

    /**
     * The generation number.
     *
     * @var int
     */
    public $generationNumber;
}