first commit

common/Billing/Billable.php

@@ -0,0 +1,68 @@
+<?php namespace Common\Billing;
+
+use Carbon\Carbon;
+use Common\Billing\Models\Price;
+use Illuminate\Database\Eloquent\Collection;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Support\Facades\DB;
+use LogicException;
+
+/**
+ * Trait Billable
+ * @property-read Collection|Subscription[] $subscriptions
+ */
+trait Billable
+{
+    public function subscribe(
+        string $gateway,
+        string $gatewayId,
+        string $status,
+        Price $price,
+    ): Subscription {
+        if (Subscription::where('gateway_id', $gatewayId)->exists()) {
+            throw new LogicException(__('This subscription ID already exists'));
+        }
+
+        if ($price->interval === 'year') {
+            $renewsAt = Carbon::now()->addYears($price->interval_count);
+        } elseif ($price->interval === 'week') {
+            $renewsAt = Carbon::now()->addWeeks($price->interval_count);
+        } else {
+            $renewsAt = Carbon::now()->addMonths($price->interval_count);
+        }
+
+        $subscription = $this->subscriptions()->create([
+            'price_id' => $price->id,
+            'product_id' => $price->product_id,
+            'ends_at' => null,
+            'renews_at' => $renewsAt,
+            'gateway_name' => $gateway,
+            'gateway_id' => $gatewayId,
+            'gateway_status' => $status,
+        ]);
+
+        $this->load('subscriptions');
+
+        return $subscription;
+    }
+
+    public function subscribed(): bool
+    {
+        $subscription = $this->subscriptions->first(function (
+            Subscription $sub,
+        ) {
+            return $sub->valid();
+        });
+
+        return !is_null($subscription);
+    }
+
+    public function subscriptions(): HasMany
+    {
+        // always return subscriptions that are not attached to any gateway last
+        return $this->hasMany(Subscription::class, 'user_id')->orderBy(
+            DB::raw('FIELD(gateway_name, "none")'),
+            'asc',
+        );
+    }
+}