<?php

use setasign\Fpdi\Fpdi;
use setasign\Fpdi\PdfReader\PageBoundaries;
use setasign\Fpdi\PdfParser\Type\PdfType;
use setasign\Fpdi\PdfParser\Type\PdfDictionary;
use setasign\Fpdi\PdfParser\Type\PdfArray;

class myFpdi extends Fpdi {

    /**
     * @inheritdoc
     * @param int $pageNumber
     * @param string $box
     * @param bool $groupXObject
     * @return string
     */
    public function importPage($pageNumber, $box = PageBoundaries::CROP_BOX, $groupXObject = true)
    {
        $pageId = parent::importPage($pageNumber, $box, $groupXObject);

        // gather links
        $links = [];
        $reader = $this->getPdfReader($this->currentReaderId);
        $parser = $reader->getParser();
        $pageObj = $reader->getPage($pageNumber)->getPageObject();
        $annotationsObject = PdfDictionary::get(PdfType::resolve($pageObj, $parser), 'Annots');
        $annotations = PdfType::resolve($annotationsObject, $parser);
        if($annotations->value) {
            foreach($annotations->value as $annotationRef) {
                $annotation = PdfType::resolve($annotationRef, $parser);
                if(PdfDictionary::get($annotation, 'Type')->value === 'Annot' && PdfDictionary::get($annotation, 'Subtype')->value === 'Link') {
                    $a = PdfDictionary::get($annotation, 'A');
                    if($a) {
                        $link = PdfType::resolve($a, $parser);
                        if(PdfDictionary::get($link, 'S')->value === 'URI') {
                            $rectObj = PdfDictionary::get($annotation, 'Rect');
                            if($rectObj instanceof PdfArray) {
                                $rect = $rectObj->value;
                                $links[] = [
                                    $rect[0]->value,
                                    $rect[1]->value,
                                    $rect[2]->value - $rect[0]->value,
                                    $rect[1]->value - $rect[3]->value,
                                    PdfDictionary::get($link, 'URI')->value
                                ];
                            }
                        }
                    }
                }
            }
        }

        // save for future
        $this->importedPages[$pageId]['links'] = $links;

        return $pageId;
    }

    /**
     * @inheritdoc
     * @param mixed $tpl
     * @param float|int|array $x
     * @param float|int $y
     * @param float|int|null $width
     * @param float|int|null $height
     * @param bool $adjustPageSize
     * @return array
     */
    public function useTemplate($tpl, $x = 0, $y = 0, $width = null, $height = null, $adjustPageSize = false)
    {
        $ret = parent::useTemplate($tpl, $x, $y, $width, $height, $adjustPageSize);
        $links = $this->importedPages[$tpl]['links'];
        foreach ($links as $link) {
            $this->Link(
                $link[0],
                $this->getPageHeight() - $link[1],
                $link[2],
                $link[3],
                $link[4]
            );
        }
        return $ret;
    }

}