<?php

namespace App\SearchDisplace;

use App\SearchDisplace\Documents\DocumentFile;
use Illuminate\Support\Facades\Storage;
use App\SearchDisplace\Convertor\Convertor;
use DOMDocument;

class SearchAndDisplaceXML
{
    protected $file;
    protected $searchers;
    protected $storage;
    protected $searchOnly;
    protected $markedStyleCreated;

    public function __construct($file, $searchers, $searchOnly)
    {
        $this->fileDirectory = $file;
        $this->searchers = $searchers;
        $this->storage = Storage::disk('local'); 
        $this->searchOnly = $searchOnly; 
        $this->markedStyleCreated = false;
    }

    public function execute()
    {
        $sdXML = $this->applySD();
        $pathinfo = pathinfo($sdXML);

        $this->convertSearchDisplacedXMLToHTML($sdXML);

        DocumentFile::updateImagesPath($pathinfo['dirname'] . '/document_sdapplied.html', $this->fileDirectory);

        return $pathinfo['filename'];
    }
    
    /**
     * Convert (Search displaced) XML to HTML for browser preview
     * 
     * @return void
     */
    protected function convertSearchDisplacedXMLToHTML($file)
    {
        Convertor::convert('html', $file);
    }

    /**
     * Read XML document and send text contents to SD
     * 
     * @return void
     */
    protected function applySD()
    {
        $dom = new \DOMDocument();
        $filePath = $this->storage->path("contracts/$this->fileDirectory");
        $dom->load($filePath . "/document.xml");

        foreach($dom->getElementsByTagName('p') as $p) {
            if(count($p->childNodes) > 0 && isset($p->parentNode->tagName) && $p->parentNode->tagName !== "table:table-cell") {
                foreach($p->childNodes as $child) {
                    if(isset($child->tagName) && $child->tagName === "text:span") {
                        $content = trim($child->textContent);
                        if($content == '') {
                            continue;
                        }

                        $this->replace($content, $child, $dom);
                    }
                }
            } else {
                $content = trim($p->textContent);
                if($content == '') {
                    continue;
                }

                $this->replace($content, $p, $dom);
            }
        }

        $dom->save($filePath . "/document_sdapplied.xml");

        return $filePath . "/document_sdapplied.xml";
    }

    /**
     * Apply SD on document's paragraph
     * 
     * @param string $content paragraph content
     * @param $element DOM element
     * 
     * @return void
     */
    protected function replace($content, $element, $dom)
    {
        $search = new SearchAndDisplace(
                    stripslashes($content),
                    [
                        'searchers' => $this->searchers,
                    ],
                    $this->searchOnly,
                    true
                );

        $changed = $search->execute();

        if($changed) {
            if($this->searchOnly) {
                $content = $element->textContent;
                $indexes = $changed;
            } else {
                $content = $changed['content'];
                $indexes = $changed['indexes'];
            }

            foreach(array_keys($indexes) as $searcher) {
                if(empty($indexes[$searcher])) {
                    continue;
                }

                foreach($indexes[$searcher] as $change) {
                    $first = substr($content, 0, $change['start']);
                    $changed = substr($content, $change['start'], $change['end'] - $change['start'] + 1);
                    $last = substr($content, $change['end'] + 1);
        
                    $element->textContent = $first;
                    $changed = $dom->createElement("text:span", $changed);
                    $last = $dom->createElement("text:span", $last);
                    //text:style-name="mark"
                    $changed->setAttribute('text:style-name', 'mark');
                    $element->appendChild($changed);
                    $element->appendChild($last);
                }
            }

            if(!$this->markedStyleCreated) {
                $this->createMarkedStyle($dom);
            }
            $this->markedStyleCreated = true;
        }
    }

    /**
     * Create marked style for browser preview
     * 
     */
    private function createMarkedStyle($dom)
    {
        $style = $dom->createElement("style:style");
        $style->setAttribute("style:name", 'mark');
        $style->setAttribute("style:family", 'text');

        $child = $dom->createElement('style:text-properties');
        $child->setAttribute("officeooo:rsid", '0014890a');
        $child->setAttribute("fo:background-color", '#ffff00');

        $style->appendChild($child);

        $dom->getElementsByTagName('automatic-styles')->item(0)->appendChild($style);
    }

    /**
     * Remove marked style used in browser and convert XML file to original file type
     * 
     * @param $type file type
     * @param $file absolute file path
     * 
     * @return string $path
     */
    public static function prepareForDownload($type, $file)
    {
        // remove marked style from XML
        $dom = new DOMDocument();
        $dom->load($file);
        $style = $dom->getElementsByTagName('automatic-styles')->item(0);
        $style->removeChild($style->lastChild);
        $dom->save($file);

        return Convertor::convert($type, $file, true);
    }
}