<?php

namespace plugin\inspection\model;

use think\admin\Model;

class InspectionRecord extends Model
{
    public function staff()
    {
        return $this->belongsTo(InspectionStaff::class, 'staff_id', 'id');
    }

    public function points()
    {
        return $this->hasMany(InspectionRecordPoint::class, 'record_id', 'id')->order('create_at', 'asc');
    }

    public function calculateDistance()
    {
        $points = $this->points()->select();
        $distance = 0;
        $previousPoint = null;
        foreach ($points as $point) {
            $lat = $point->latitude;
            $lng = $point->longitude;
            if ($previousPoint) {
                $distance += $this->calculateDistanceBetweenPoints($previousPoint[0], $previousPoint[1], $lat, $lng);
            }
            $previousPoint = [$lat, $lng];
        }
        return $distance;
    }

    private function calculateDistanceBetweenPoints($lat1, $lng1, $lat, $lng)
    {
        $earthRadius = 6371000; // 地球半径，单位为米
        $dLat = deg2rad($lat - $lat1);
        $dLng = deg2rad($lng - $lng1);
        $a = sin($dLat / 2) * sin($dLat / 2) + cos(deg2rad($lat1)) * cos(deg2rad($lat)) * sin($dLng / 2) * sin($dLng / 2);
        $c = 2 * atan2(sqrt($a), sqrt(1 - $a));
        $distance = $earthRadius * $c;
        return $distance;
    }

}