<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Booking extends Model
{
    public function amount()
    {
        return $this->subBookings()->sum('amount');
    }

    public function signedAmount()
    {
        return $this->subBookings()->withSignedAmount()->get()
                    ->sum('signedAmount');
    }

    public function subBookings()
    {
        return $this->hasMany('App\SubBooking');
    }

    /**
     * Return true, if the booking consists only of one sub-booking.
     * NOTICE: The book instance has to be loaded with the
     * ->withCount('subBookings') method to be able to access the comments
     * count.
     *
     * @return boolean
     */
    public function isSimple()
    {
        return $this->sub_bookings_count === 1;
    }

    public function project()
    {
        if ($this->isSimple()) {
            return $this->subBookings()->first()->project();
        }

        return null;
    }
    
    public function accountType()
    {
        if ($this->isSimple()) {
            return $this->subBookings()->first()->accountType();
        }

        return null;
    }
}