<?php
namespace shop;
class Coupon implements \ArrayAccess
{
  private $data = [];

  public function __construct( int $element_id )
  {
    global $mdb;
    if ( $element_id )
    {
      $result = $mdb -> get( 'pp_shop_coupon', '*', [ 'id' => $element_id ] );
      if ( is_array( $result ) )
        $this -> data = $result;
    }
  }

  public function load_from_db_by_name( string $name )
  {
    global $mdb;
    $result = $mdb -> get( 'pp_shop_coupon', '*', [ 'name' => $name ] );
    if ( is_array( $result ) )
      $this -> data = $result;
  }

  public function is_one_time()
  {
    return (bool)( $this -> data['one_time'] ?? 0 );
  }

  public function is_available()
  {
    if ( !( $this -> data['id'] ?? 0 ) )
      return false;

    if ( !( $this -> data['status'] ?? 0 ) )
      return false;

    return !( $this -> data['used'] ?? 0 );
  }

  public function set_as_used()
  {
    $id = (int)( $this -> data['id'] ?? 0 );
    if ( $id > 0 )
    {
      global $mdb;
      $repo = new \Domain\Coupon\CouponRepository( $mdb );
      $repo -> markAsUsed( $id );
      $this -> data['used'] = 1;
    }
  }

  public function __get( $variable )
  {
    return isset( $this -> data[$variable] ) ? $this -> data[$variable] : null;
  }

  public function __set( $variable, $value )
  {
    $this -> data[$variable] = $value;
  }

  public function offsetExists( $offset )
  {
    return isset( $this -> data[$offset] );
  }

  public function offsetGet( $offset )
  {
    return isset( $this -> data[$offset] ) ? $this -> data[$offset] : null;
  }

  public function offsetSet( $offset, $value )
  {
    $this -> data[$offset] = $value;
  }

  public function offsetUnset( $offset )
  {
    unset( $this -> data[$offset] );
  }
}