Added shipping method model and shipping rate model

src/Contracts/ShippingMethod.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace Vanilo\Shipping\Contracts;
+
+interface ShippingMethod
+{
+}

src/Models/ShippingRate.php

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+<?php
+
+namespace Vanilo\Shipping\Models;
+
+use Illuminate\Contracts\Support\Arrayable;
+
+class ShippingRate implements Arrayable
+{
+    protected $price;
+    protected $currency;
+
+    public function setPrice($value, $currency = null)
+    {
+        $this->price = $value;
+        if (isset($currency)) {
+            $this->currency = $currency;
+        }
+    }
+
+    public function setCurrency($value)
+    {
+        $this->currency = $value;
+    }
+
+    public function getPrice()
+    {
+        return $this->price;
+    }
+
+    public function getConvertedPrice()
+    {
+        return currency($this->price, $this->currency, null, false);
+    }
+
+    public function getCurrency()
+    {
+        return $this->currency;
+    }
+
+    public function toArray()
+    {
+        return [
+            'price'              => $this->price,
+            'currency'           => $this->currency,
+            'converted_price'    => $this->getConvertedPrice(),
+            'converted_currency' => currency()->getUserCurrency(),
+            'display_price'      => currency_format($this->getConvertedPrice(), currency()->getUserCurrency()),
+        ];
+    }
+}

src/ShippingMethods.php

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+<?php
+
+namespace Vanilo\Shipping;
+
+use Vanilo\Shipping\Contracts\ShippingMethod;
+
+class ShippingMethods
+{
+    /** @var array */
+    private static $registry = [];
+
+    public static function register(string $id, string $class)
+    {
+        if (array_key_exists($id, self::$registry)) {
+            return;
+        }
+
+        if (!class_implements($class, ShippingMethod::class)) {
+            throw new \InvalidArgumentException(
+                sprintf(
+                    'The class you are trying to register (%s) as property type, ' .
+                    'must implement the %s interface.',
+                    $class,
+                    ShippingMethod::class
+                )
+            );
+        }
+
+        self::$registry[$id] = $class;
+    }
+
+    public static function make(string $id)
+    {
+        $className = self::getClass($id);
+
+        if (null === $className) {
+            throw new \Exception(
+                "No shipping method is registered with the id `$id`."
+            );
+        }
+
+        return app()->make($className);
+    }
+
+    public static function getClass(string $id): ?string
+    {
+        return self::$registry[$id] ?? null;
+    }
+}

src/resources/database/migrations/2020_08_10_164449_create_shipping_methods.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateShippingMethods extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('shipping_methods', function (Blueprint $table) {
+            $table->bigIncrements('id');
+            $table->string('name');
+            $table->string('class_name');
+            $table->text('options');
+            $table->smallInteger('status');
+            $table->smallInteger('order');
+            $table->softDeletes();
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('shipping_methods');
+    }
+}