<?php
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);
abstract class BaseEntity{
    protected $id;
    public abstract function display();
	public abstract function update($params);
	public function getId(){
		return $this->id;
	}
}
abstract class BaseList{
	protected $lastId;
	protected $list;
	public function __construct(){
		$this->lastId=1;
		$this->list=array();
	}
	public abstract function add($params);
	public function display(){
		for($i=0;$i<count($this->list);$i++){
			$this->list[$i]->display();
		}
	}
	public function update($params){
		for($i=0;$i<count($this->list);$i++){
			if($this->list[$i]->getId()==$params['id']){
				$this->list[$i]->update($params);
				break;
			}
		}
	}
	public function delete($id){
		for($i=0;$i<count($this->list);$i++){
			if($this->list[$i]->getId()==$id){
				array_splice($this->list,$i,1);
				break;
			}
		}
	}
}
class Category extends BaseEntity{
    private $name;
    public function __construct($params){
        $this->id=$params['id'];
        $this->name=$params['name'];
    }
    public function display(){
        echo $this->id.". ".$this->name."</br>";
    }
    public function update($params){
        $this->id=$params['id'];
        $this->name=$params['name'];
    }
    public function __destruct(){
        $this->id=null;
        $this->name=null;
    }
}
class Property extends BaseEntity{
    private $name;
    private $units;
    public function __construct($params){
        $this->id=$params['id'];
        $this->name=$params['name'];
		$this->units=$params['units'];
    }
    public function display(){
        echo $this->id.". ".$this->name." <i>(".$this->units.")</i></br>";
    }
    public function update($params){
        $this->id=$params['id'];
        $this->name=$params['name'];
		$this->units=$params['units'];
    }
    public function __destruct(){
        $this->id=null;
        $this->name=null;
        $this->units=null;
    }
}
class Backpack extends BaseEntity{
    private $model;
    private $vendor;
    private $price;
    private $category;
    private $properties;
    public function __construct($params){
        $this->id=$params['id'];
        $this->model=$params['model'];
		$this->vendor=$params['vendor'];
		$this->price=$params['price'];
        $this->category=$params['category'];
		$this->properties=$params['properties'];
    }
    public function display(){
        echo $this->id.". ".$this->vendor." ".$this->model."</br>";
        echo "Категорія: <i>".$this->category."</i></br>";
        echo "Ціна: <b>".$this->price."</b> грн</br>";
        echo "<b>Характеристики:</b></br>";
        foreach (json_decode($this->properties) as $propertyName => $propertyValue) {
            echo $propertyName . ": " . $propertyValue . "</br>";
        }
    }
    public function update($params){
        $this->id=$params['id'];
        $this->model=$params['model'];
		$this->vendor=$params['vendor'];
		$this->price=$params['price'];
        $this->category=$params['category'];
		$this->properties=$params['properties'];
    }
    public function __destruct(){
        $this->id=null;
        $this->model=null;
        $this->vendor=null;
        $this->price=null;
        $this->category=null;
        $this->properties=null;
    }
}
class CategoryList extends BaseList{
	public function add($params){
		$params['id']=$this->lastId;
		$newObj=new Category($params);
		array_push($this->list,$newObj);
		$this->lastId++;
	}
}
class PropertyList extends BaseList{
	public function add($params){
		$params['id']=$this->lastId;
		$newObj=new Property($params);
		array_push($this->list,$newObj);
		$this->lastId++;
	}
}
class BackpackList extends BaseList{
	public function add($params){
		$params['id']=$this->lastId;
		$newObj=new Backpack($params);
		array_push($this->list,$newObj);
		$this->lastId++;
	}
}

/*$a=new Property(1, "Вага", "кг");
$a->display();
$a=new Backpack(1,"Flare", "Osprey","2000","Міські рюкзаки", '{"Вага":"0.8 кг", "Об\'єм":"60 л"}');
$a->display();*/
/*$a=new Category(1,"Похідні рюкзаки");
$b=new Category(2,"Міські рюкзаки");
$a->display();
$b->display();
$a->update(1,"Експедиційні рюкзаки");
$a->display();*/
/*$a=new CategoryList();
$a->add(['name'=>'Похідні рюкзаки']);
$a->add(['name'=>'Міські рюкзаки']);
$a->display();
$a->update([
	'id'=>'1',
	'name'=>'Експедиційні рюкзаки'
]);
$a->delete(1);
$a->display();*/
/*$b=new PropertyList();
$b->add(
	['name'=>'Вага', 'units'=>'кг']
);
$b->add(
	['name'=>'Об\'єм', 'units'=>'л']
);
$b->display();
$b->update(
	['id'=>'1', 'name'=>'Маса', 'units'=>'г']
);
$b->display();
$b->delete(1);
$b->display();*/
$c=new BackpackList();
$c->add(
	[
		'model'=>'Flare',
		'vendor'=>'Osprey',
		'price'=>'2000',
		'category'=>'Міські рюкзаки',
		'properties'=>'{"Вага":"0.8 кг", "Об\'єм":"20 л"}'
	]
);
$c->add(
	[
		'model'=>'Kestrel',
		'vendor'=>'Osprey',
		'price'=>'6000',
		'category'=>'Похідні рюкзаки',
		'properties'=>'{"Вага":"1.8 кг", "Об\'єм":"60 л"}'
	]
);
$c->display();
$c->update(
	[
		'id'=>'2',
		'model'=>'Kestrel',
		'vendor'=>'Osprey',
		'price'=>'8000',
		'category'=>'Похідні рюкзаки',
		'properties'=>'{"Вага":"1.8 кг", "Об\'єм":"60 л"}'
	]
);
$c->display();
$c->delete(1);
$c->display();
?>