<?php

namespace rednaoeasycalculationforms\core\Managers\FormManager\Calculator;

class PricePerDistance extends CalculatorBase
{

    public $EarthRadius = 6378137;
    public function ExecutedCalculation($value)
    {
        if($value == null)
            $value = $this->Field->GetValue();

        $origins = $this->Field->GetOptionValue('Origins', array());
        if(count($origins) == 0)
            return $this->CreateCalculationObject('', '', 0);

        $latitude1 = $origins[0]->Latitude;
        $longitude1 = $origins[0]->Longitude;

        $latitude2 = $value->Latitude;
        $longitude2 = $value->Longitude;

        $distance = $this->ComputeDistanceBetween(array('lat' => $latitude1, 'lng' => $longitude1), array('lat' => $latitude2, 'lng' => $longitude2));
        $distance = \round($distance, 8);
        $regularPriceToUse = $this->Field->GetRegularPrice();

        switch ($this->Field->GetOptionValue('RoundingType', ''))
        {
            case 'round_up':
                $distance = \ceil($distance);
                break;
            case 'round_down':
                $distance = floor($distance);
                break;
        }

        $price = $regularPriceToUse;

        $price = \floatval($price);
        $measureFactor = 1;

        switch ($this->Field->GetOptionValue('MeasureType', ''))
        {
            case "kilometer":
                $measureFactor = .001;
                break;
            case 'miles':
                $measureFactor = .00062137273;
                break;
        }

        return $this->CreateCalculationObject($distance * $measureFactor * $price, 0, 1);
    }

    public function ComputeDistanceBetween($from, $to) {
        return $this->ComputeAngleBetween($from, $to) * $this->EarthRadius;
    }

    public function ComputeAngleBetween($from, $to) {
        return $this->DistanceRadians(deg2rad($from['lat']), deg2rad($from['lng']),
        deg2rad($to['lat']), deg2rad($to['lng']));
    }

    public function DistanceRadians($lat1, $lng1, $lat2, $lng2) {
        return $this->arcHav($this->HavDistance($lat1, $lat2, $lng1 - $lng2));
    }

    function Hav($x) {
        $sinHalf = sin($x * 0.5);
        return $sinHalf * $sinHalf;
    }

    function HavDistance($lat1, $lat2, $dLng) {
        return $this->Hav($lat1 - $lat2) + $this->Hav($dLng) * cos($lat1) * cos($lat2);
    }

    function arcHav($x) {
        return 2 * asin(sqrt($x));
    }

}