<?php

namespace App\Service;

use XMLReader;

use App\Entity\SupportedArea;

use Doctrine\ORM\EntityManagerInterface;

use CrEOF\Spatial\PHP\Types\Geometry\Polygon;
use CrEOF\Spatial\PHP\Types\Geometry\Point;
use CrEOF\Spatial\PHP\Types\Geometry\LineString;

class KMLFileImporter
{
    protected $em;

    public function __construct(EntityManagerInterface $em)
    {
        $this->em = $em;
    }

    public function getMapData($fh)
    {
        $placemark_name = '';

        $reader = new XMLReader();
        $reader->open($fh);

        while($reader->read())
        {
            if ($reader->nodeType == XMLReader::ELEMENT && $reader->name == "Placemark")
            {
                while($reader->read())
                {
                    if ($reader->nodeType == XMLReader::ELEMENT && $reader->name == "name")
                    {
                        $placemark_name = $reader->readInnerXML();
                    }

                    if ($reader->nodeType == XMLReader::ELEMENT && $reader->name == "coordinates")
                    {
                        // each polygon is a new area
                        $supported_area = new SupportedArea();
                        $supported_area->setName($placemark_name);

                        $point_array = [];
                        $coordinates = $reader->readInnerXML();

                        // get each line
                        $coord_split = explode("\n", $coordinates);

                        // go through all the coordinates
                        foreach ($coord_split as $coord)
                        {
                            // skip blank lines
                            $coord_trim = trim($coord);
                            if (strlen($coord_trim) <= 0)
                                continue;

                            // echo "$coord_trim\n";

                            $point_split = explode(',', $coord_trim);

                            $point_array[] = new Point($point_split[0], $point_split[1]);
                        }

                        $area = new Polygon([new LineString($point_array)]);
                        $supported_area->setCoverageArea($area);

                        // add supported area
                        $this->em->persist($supported_area);
                    }
                }
            }   
        }
        $reader->close();

        $this->em->flush();
    }
}