<?php

namespace Chill\MainBundle\Doctrine\Model;

use \JsonSerializable;

/**
 * Description of Point
 *
 */
class Point implements JsonSerializable {
    private float $lat;
    private float $lon;
    public static string $SRID = '4326';

    private function __construct(float $lon, float $lat)
    {
        $this->lat = $lat;
        $this->lon = $lon;
    }

    public function toGeoJson(): string
    {
        $array = $this->toArrayGeoJson();
        return \json_encode($array);
    }

    public function jsonSerialize(): array
    {
        return $this->toArrayGeoJson();
    }

    public function toArrayGeoJson(): array
    {
        return [
            "type" => "Point",
            "coordinates" => [ $this->lon, $this->lat ]
        ];
    }

    /**
     *
     * @return string
     */
    public function toWKT(): string
    {
        return 'SRID='.self::$SRID.';POINT('.$this->lon.' '.$this->lat.')';
    }

    /**
     *
     * @param type $geojson
     * @return Point
     */
    public static function fromGeoJson(string $geojson): Point
    {
        $a = json_decode($geojson);
        //check if the geojson string is correct
        if (NULL === $a or !isset($a->type) or !isset($a->coordinates)){
            throw PointException::badJsonString($geojson);
        }

        if ($a->type != 'Point'){
            throw PointException::badGeoType();
        }

        $lat = $a->coordinates[1];
        $lon = $a->coordinates[0];

        return Point::fromLonLat($lon, $lat);
    }

    public static function fromLonLat(float $lon, float $lat): Point
    {
        if (($lon > -180 && $lon < 180) && ($lat > -90 && $lat < 90))
        {
            return new Point($lon, $lat);
        } else {
            throw PointException::badCoordinates($lon, $lat);
        }
    }

    public static function fromArrayGeoJson(array $array): Point
    {
        if ($array['type'] == 'Point' &&
                isset($array['coordinates']))
        {
            return self::fromLonLat($array['coordinates'][0], $array['coordinates'][1]);
        }
    }

    public function getLat(): float
    {
        return $this->lat;
    }

    public function getLon(): float
    {
        return $this->lon;
    }
}