Exercise about POO heritage and parents composants

Bicycle.php

<?php

require_once 'Vehicle.php';

class Bicycle extends Vehicle
{
    public function __construct(string $color, int $nbSeats, string $energy)
    {
        parent::__construct($color, $nbSeats);
        $this->energy = $energy;
    }
}

Car.php

<?php

require_once 'Vehicle.php';

class Car extends Vehicle
{
    const ALLOWED_ENERGIES = ['fuel', 'electric'];

    protected $energy;

    protected $energyLevel;

    
    public function __construct(string $color, int $nbSeats, string $energy)
    {
        parent::__construct($color, $nbSeats);
        $this->energy = $energy;
    }
    

    public function getEnergy(): string
    {
        return $this->energy;
    }

    public function setEnergy(string $energy): Car
    {
        if (in_array($energy, self::ALLOWED_ENERGIES)) {
            $this->energy = $energy;
        }
        return $this;
    }

    public function getEnergyLevel(): int
    {
        return $this->energyLevel;
    }

    public function setEnergyLevel(int $energyLevel): void
    {
        $this->energyLevel = $energyLevel;
    }
}

index.php

<?php
require_once '../src/Bicycle.php';
require_once '../src/Car.php';
require_once '../src/Truck.php';

$bicycle = new Bicycle('blue', 1, 'human energy');
echo $bicycle->forward();
var_dump($bicycle);


$car = new Car('green', 4, 'electric');
echo $car->forward();
var_dump($car);
var_dump(Car::ALLOWED_ENERGIES);

$truck = new Truck('red', 2, 50);
echo "<strong> The truck is </strong>" . $truck->filling();

$truck2 = new Truck('black', 3, 40);
echo "<strong> The second truck starts... </strong>" . $truck2->forward() . "</br>" . $truck2->getCurrentSpeed() ."'s the current speed... </br>" . $truck2->brake();

Truck.php

<?php

class Truck extends Vehicle
{
    private $stockageCapacity;

    private $fillingTruck;

    public function __construct(string $color, int $nbSeats, int $stockageCapacity, int $fillingTruck = 0)
    {
        parent::__construct($color, $nbSeats);
        $this->stockageCapacity = $stockageCapacity;
        $this->fillingTruck = $fillingTruck;
    }

    public function filling()
    {
        $sentence = "";
        while ($this->fillingTruck < $this->stockageCapacity) {
            $this->fillingTruck++;
            $sentence .= $this->isFull() . "</br>";
        }
        return $sentence;
    }

    public function isFull() : string
    {
        if ($this->fillingTruck >= $this->stockageCapacity) {
            return "Full!";
        } else {
            return "in filling..";
        }
    }

    public function getStockageCapacity()
    {
        return $this->stockageCapacity;
    }

    public function setStockageCapacity($stockageCapacity)
    {
        $this->stockageCapacity = $stockageCapacity;

        return $this;
    }

    public function getFillingTruck()
    {
        return $this->fillingTruck;
    }

    public function setFillingTruck($fillingTruck)
    {
        $this->fillingTruck = $fillingTruck;

        return $this;
    }
}

Vehicle.php

<?php

// Vehicle.php

class Vehicle
{
    /**
    * @var string
    */
    protected $color;

    /**
    * @var integer
    */
    protected $currentSpeed;

    /**
    * @var integer
    */
    protected $nbSeats;

    /**
    * @var integer
    */
    protected $nbWheels;

    
    public function __construct(string $color, int $nbSeats)
    {
        $this->color = $color;
        $this->nbSeats = $nbSeats;
    }

    public function forward(): string
    {
        $this->currentSpeed = 15;
        return "Go !";
    }

    public function brake(): string
    {
        $sentence = "";
        while ($this->currentSpeed > 0) {
            $this->currentSpeed--;
            $sentence .= "Brake !!!";
        }

        $sentence .= "I'm stopped !";
        return $sentence;
    }

    public function getCurrentSpeed(): int
    {
        return $this->currentSpeed;
    }

    public function setCurrentSpeed(int $currentSpeed): void
    {
        if ($currentSpeed >= 0) {
            $this->currentSpeed = $currentSpeed;
        }
    }

    public function getColor(): string
    {
        return $this->color;
    }

    public function setColor(string $color): void
    {
        $this->color = $color;
    }

    public function getNbSeats(): int
    {
        return $this->nbSeats;
    }

    public function setNbSeats(int $nbSeats): void
    {
        $this->nbSeats = $nbSeats;
    }

    public function getNbWheels(): int
    {
        return $this->nbWheels;
    }

    public function setNbWheels(int $nbWheels): void
    {
        $this->nbWheels = $nbWheels;
    }
}