<?php

namespace App\Classes\Billing;

use App\Exceptions\ChargeFailedException;
use App\Exceptions\CouldNotGetTaxException;
use App\Http\Requests\CheckoutRequest;
use App\Models\Orders\Order;
use App\Models\Product\Product;
use App\Models\ShippingMethod;
use Gloudemans\Shoppingcart\Cart;
use Illuminate\Http\Request;

class ShoppingCart {

    /**
     * The cart instance.
     *
     * @var Cart
     */
    protected $cart;

    /**
     * The TaxJar instance.
     *
     * @var \App\Classes\Billing\TaxJar
     */
    protected $taxjar;

    /**
     * The Stripe instance.
     *
     * @var \App\Classes\Billing\Stripe
     */
    protected $stripe;

    /**
     * The shipping cost of the order.
     *
     * @var
     */
    protected $shipping;

    /**
     * The tax of the order.
     *
     * @var
     */
    protected $tax;

    /**
     * The total cost of the order.
     *
     * @var
     */
    protected $total;

    /**
     * ShoppingCart constructor.
     *
     * @param Cart $cart
     * @param \App\Classes\Billing\TaxJar $taxjar
     * @param \App\Classes\Billing\Stripe $stripe
     */
    public function __construct(Cart $cart, TaxJar $taxjar, Stripe $stripe) {

        $this->cart = $cart;
        $this->taxjar = $taxjar;
        $this->stripe = $stripe;

    }

    /**
     * Calculate the the tax, shipping and total for the cart content.
     *
     * @param Request $request
     * @throws CouldNotGetTaxException
     */
    public function calculateOrderDetails(Request $request) {

        try {

            $tax = $this->taxjar->calculateTax($this, $request);

        } catch (CouldNotGetTaxException $exception) {

            throw $exception;

        }

        $this->shipping = ShippingMethod::find($request->shipping_method)->price;
        $this->tax = formatAsCents($tax->amount_to_collect);
        $this->total = (formatAsCents($this->subtotal()) + $this->shipping() + $this->tax());

    }

    /**
     * Place the customer's order and charge them.
     *
     * @param CheckoutRequest $request
     * @return static
     * @throws ChargeFailedException
     * @throws CouldNotGetTaxException
     */
    public function checkout(CheckoutRequest $request) {

        try {

            $this->calculateOrderDetails($request);

        } catch (CouldNotGetTaxException $exception) {

            throw $exception;

        }

        $order = Order::buildFromRequest($request, $this);

        try {

            $this->stripe->createCharge($order, $request->stripeToken);

        } catch (ChargeFailedException $exception) {

            throw $exception;

        }

        $order->saveOrder($this);

        $this->destroy();

        return $order;
    }

    /**
     * Add a product to the shopping cart.
     *
     * @param Product $product
     * @param $quantity
     * @param $options
     * @return \Gloudemans\Shoppingcart\CartItem
     */
    public function add(Product $product, $quantity, $options) {
        return $this->cart->add($product, $quantity, $options);
    }

    /**
     * Remove an item from the shopping cart.
     *
     * @param $rowId
     * @return Product
     */
    public function remove($rowId) {

        $product = $this->cart->get($rowId)->model;

        $this->cart->remove($rowId);

        return $product;
    }

    /**
     * Get the content of the cart.
     *
     * @return \Illuminate\Support\Collection
     */
    public function content() {
        return $this->cart->content();
    }

    /**
     * Get the subtotal (total minus shipping and tax) of the cart.
     *
     * @return float
     */
    public function subtotal() {
        return $this->cart->subtotal();
    }

    /**
     * Returns the shipping cost for the order.
     *
     * @return mixed
     */
    public function shipping() {
        return $this->shipping;
    }

    /**
     * Returns the total tax for the order.
     *
     * @return mixed
     */
    public function tax() {
        return $this->tax;
    }

    /**
     * Returns the order total.
     *
     * @return mixed
     */
    public function total() {
        return $this->total;
    }

    /**
     * Destroy the contents of the shopping cart.
     *
     */
    public function destroy() {
        $this->cart->destroy();
    }

    /**
     * Returns the number of items in the cart.
     *
     * @return float|int
     */
    public function count() {
        return $this->cart->count();
    }

}