<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Track extends Model
{
    protected $fillable = [
        'user_id',
        'event_id',
        'trackname',
        'private',
        'uuid',
        'active',
    ];

    public function locations() {
        return $this->hasMany(Location::class)->where('accuracy', '<', 50)->orderBy('timestamp');
    }

    public function user() {
        return $this->belongsTo(User::class);
    }
    public function users() {
        return $this->hasMany(User::class);
    }

    public function event() {
        return $this->belongsTo(Event::class);
    }

    public function getLastDataAttribute()
	{
        $lastData =  ((int)$this->locations->max('timestamp') / 1000);
        return date('d.m.Y H:i', $lastData);
	}

    public function getDurationAttribute()
	{
        $duration =  ($this->locations->max('timestamp') / 1000) - ($this->locations->min('timestamp') / 1000);
        return $duration;
	}

    public function getLengthAttribute()
	{
        $length = $this->calculate_distance($this->locations) / 1000;
        return $length;
	}

    public function getPaceAttribute()
	{
        if ($this->length) {
            return floor((($this->locations->max('timestamp') / 1000) - ($this->locations->min('timestamp') / 1000)) / $this->length);
        }
	}


    protected $casts = [
        'created_at' => 'datetime:d.m.Y H:i'
    ];

    function calculate_distance($locations)
    {
        $oldlon = $oldocc = '';
        $oldlat = false;
        $distance = 0;
        foreach ($locations as $row) {
            if ($oldlat) {
                $delta_distance = $this->distance($oldlat, $oldlon, $row['lat'], $row['lon']);
                $distance += $delta_distance;
            }
            $oldlat = $row['lat'];
            $oldlon = $row['lon'];
            $oldocc = $row['created_at'];
        }
        return $distance;
    }

    function distance($lat1, $lon1, $lat2, $lon2)
    {
        $radius = 6371000; // meter
        list($lat1, $lon1, $lat2, $lon2) = array_map('deg2rad', array($lat1, $lon1, $lat2, $lon2));

        $dlat = $lat2 - $lat1;
        $dlon = $lon2 - $lon1;
        $a = pow(sin($dlat / 2), 2) + cos($lat1) * cos($lat2) * pow(sin($dlon / 2), 2);
        $c = 2 * atan2(sqrt($a), sqrt(1 - $a));
        $d = $radius * $c;
        return (int) $d;
    }
}