<?php
/**
 * User: admin
 * Date Time: 2021/5/21 20:50
 */

namespace common\components;

//运费计算
class freight
{

    //模仿达达运费计算
    /**
     * 0km < d <=2    8元
     * 2km < d <=10  每新增1km加2
     * 10km < d <=50  每新增5km 加6
     *
     * 重量
     * 0 <w <=5 kg  不加价
     * 2kg < 2 <= 10 kg  每增1 kg 加2
     * 10 kg < w <= 50kg  每新增 5kg 加6
    */
    /**
     * @param $startLat
     * @param $starLng
     * @param $endLat
     * @param $endLng
     * @param $weight 重量kg
     */
    public static function getCost($startLat,$starLng,$endLat,$endLng,$weight)
    {
        if($weight > 50 ){
            util::fail("重量太重了哦！");
        }
        //后端计算距离 m
        $phpStatDistance = util::getDistance($startLat, $starLng, $endLat, $endLng);
        $phpStatDistance = $phpStatDistance/1000;
        if($phpStatDistance > 50) {
            util::fail("距离太远了哦！");
        }
        $cost = 8; //起步价
        //距离计算
        if($phpStatDistance > 10){
            //每新增5km 加6
            $diff = ceil(($phpStatDistance - 10) / 5);
            $diffCost = $diff*6;
            $cost += $diffCost;
        }elseif ($phpStatDistance <=10 && $phpStatDistance > 2){
            //每新增1km加2
            $diff = ceil(($phpStatDistance - 2));
            $diffCost = $diff*2;
            $cost += $diffCost;
        }
        //重量计算
        if($weight > 10){
            //每新增 5kg 加6
            $diff = ceil(($weight - 10) / 5);
            $diffCost = $diff*6;
            $cost += $diffCost;
        }elseif ($weight <=10 && $weight > 2){
            //每增1 kg 加2
            $diff = ceil(($weight - 2));
            $diffCost = $diff*2;
            $cost += $diffCost;
        }
        return $cost;
    }

}