<?php namespace Octoshop\Core;

use Lang;

use Illuminate\Contracts\Support\Arrayable;

use Octoshop\Core\Contracts\Buyable;

class CartItem implements Arrayable

{

/**

* The rowID of the cart item.

*

* @var string

*/

public $rowId;

/**

* The ID of the cart item.

*

* @var int|string

*/

public $id;

/**

* The quantity for this cart item.

*

* @var int|float

*/

public $qty;

/**

* The name of the cart item.

*

* @var string

*/

public $name;

/**

* The price of the cart item without tax.

*

* @var float

*/

public $price;

/**

* The options for this cart item.

*

* @var array

*/

public $options;

/**

* The FQN of the associated model.

*

* @var string|null

*/

private $associatedModel = null;

/**

* The tax rate for the cart item.

*

* @var int|float

*/

private $taxRate = 0;

/**

* CartItem constructor.

*

* @param int|string $id

* @param string $name

* @param float $price

* @param array $options

*/

public function __construct($id, $name, $price, array $options = [])

{

if (empty($id)) {

throw new \InvalidArgumentException(Lang::get('octoshop.core::lang.cart.invalid_id'));

}

if (empty($name)) {

throw new \InvalidArgumentException(Lang::get('octoshop.core::lang.cart.invalid_name'));

}

if (strlen($price) < 0 || !is_numeric($price)) {

throw new \InvalidArgumentException(Lang::get('octoshop.core::lang.cart.invalid_price'));

}

$this->id = $id;

$this->name = $name;

$this->price = floatval($price);

$this->options = new CartItemOptions($options);

$this->rowId = $this->generateRowId($id, $options);

}

/**

* Returns the formatted price without TAX.

*

* @return string

*/

public function price()

{

return $this->price;

}

/**

* Returns the formatted price with TAX.

*

* @return string

*/

public function priceTax()

{

return $this->priceTax;

}

/**

* Returns the formatted subtotal.

* Subtotal is price for whole CartItem without TAX

*

* @return string

*/

public function subtotal()

{

return $this->subtotal;

}

/**

* Returns the formatted total.

* Total is price for whole CartItem with TAX

*

* @return string

*/

public function total()

{

return $this->total;

}

/**

* Returns the formatted tax.

*

* @return string

*/

public function tax()

{

return $this->tax;

}

/**

* Returns the formatted tax.

*

* @return string

*/

public function taxTotal()

{

return $this->taxTotal;

}

/**

* Set the quantity for this cart item.

*

* @param int|float $qty

*/

public function setQuantity($qty)

{

if(empty($qty) || ! is_numeric($qty))

throw new \InvalidArgumentException(Lang::get('octoshop.core::lang.cart.invalid_quantity'));

$this->qty = $qty;

}

/**

* Update the cart item from a Buyable.

*

* @param \Octoshop\Core\Contracts\Buyable $item

* @return void

*/

public function updateFromBuyable(Buyable $item)

{

$this->id = $item->getBuyableIdentifier();

$this->name = $item->getBuyableDescription();

$this->price = $item->getBuyablePrice();

$this->priceTax = $this->price + $this->tax;

}

/**

* Update the cart item from an array.

*

* @param array $attributes

* @return void

*/

public function updateFromArray(array $attributes)

{

$this->id = array_get($attributes, 'id', $this->id);

$this->qty = array_get($attributes, 'qty', $this->qty);

$this->name = array_get($attributes, 'name', $this->name);

$this->price = array_get($attributes, 'price', $this->price);

$this->priceTax = $this->price + $this->tax;

$this->options = new CartItemOptions(array_get($attributes, 'options', []));

$this->rowId = $this->generateRowId($this->id, $this->options->all());

}

/**

* Associate the cart item with the given model.

*

* @param mixed $model

* @return void

*/

public function associate($model)

{

$this->associatedModel = is_string($model) ? $model : get_class($model);

}

/**

* Set the tax rate.

*

* @param int|float $taxRate

* @return void

*/

public function setTaxRate($taxRate)

{

$this->taxRate = $taxRate;

}

/**

* Get an attribute from the cart item or get the associated model.

*

* @param string $attribute

* @return mixed

*/

public function __get($attribute)

{

if(property_exists($this, $attribute)) {

return $this->{$attribute};

}

switch ($attribute) {

case 'priceTax': return $this->price + $this->tax;

case 'subtotal': return $this->qty * $this->price;

case 'total': return $this->qty * $this->priceTax;

case 'tax': return $this->price * ($this->taxRate / 100);

case 'taxTotal': return $this->tax * $this->qty;

}

return null;

}

public function product()

{

return with(new $this->associatedModel)->find($this->id);

}

/**

* Create a new instance from a Buyable.

*

* @param \Octoshop\Core\Contracts\Buyable $item

* @param array $options

* @return \Octoshop\Core\CartItem

*/

public static function fromBuyable(Buyable $item, array $options = [])

{

return new self($item->getBuyableIdentifier(), $item->getBuyableDescription(), $item->getBuyablePrice(), $options);

}

/**

* Create a new instance from the given array.

*

* @param array $attributes

* @return \Octoshop\Core\CartItem

*/

public static function fromArray(array $attributes)

{

$options = array_get($attributes, 'options', []);

return new self($attributes['id'], $attributes['name'], $attributes['price'], $options);

}

/**

* Create a new instance from the given attributes.

*

* @param int|string $id

* @param string $name

* @param float $price

* @param array $options

* @return \Octoshop\Core\CartItem

*/

public static function fromAttributes($id, $name, $price, array $options = [])

{

return new self($id, $name, $price, $options);

}

/**

* Generate a unique id for the cart item.

*

* @param string $id

* @param array $options

* @return string

*/

protected function generateRowId($id, array $options)

{

ksort($options);

return md5($id . serialize($options));

}

/**

* Get the instance as an array.

*

* @return array

*/

public function toArray()

{

return [

'rowId' => $this->rowId,

'id' => $this->id,

'name' => $this->name,

'qty' => $this->qty,

'price' => $this->price,

'options' => $this->options,

'tax' => $this->tax,

'subtotal' => $this->subtotal

];

}

}