feat: Introduce Event::fromArray to create assignment event from array (

#27)

src/Amplitude/Event.php

@@ -2,42 +2,98 @@
 
 namespace AmplitudeExperiment\Amplitude;
 
+use InvalidArgumentException;
 use RuntimeException;
 
+/**
+ * @phpstan-type Payload array{
+ *     event_type: string,
+ *     event_properties?: array<mixed>|null,
+ *     user_properties?: array<mixed>|null,
+ *     user_id?: string|null,
+ *     device_id?: string|null,
+ *     insert_id?: string|null,
+ *     time?: int|null
+ * }
+ */
 class Event
 {
-    public ?string $eventType = null;
+    public string $eventType;
     /**
-     * @var ?array<mixed>
+     * @var array<mixed>|null
      */
-    public ?array $eventProperties = null;
+    public ?array $eventProperties;
     /**
-     * @var ?array<mixed>
+     * @var array<mixed>|null
      */
-    public ?array $userProperties = null;
-    public ?string $userId = null;
-    public ?string $deviceId = null;
-    public ?string $insertId = null;
-    public ?int $time = null;
+    public ?array $userProperties;
+    public ?string $userId;
+    public ?string $deviceId;
+    public ?string $insertId;
+    public ?int $time;
 
-    public function __construct(string $eventType)
+    /**
+     * @param array<mixed>|null $eventProperties
+     * @param array<mixed>|null $userProperties
+     */
+    public function __construct(
+        string $eventType,
+        ?array $eventProperties = null,
+        ?array $userProperties = null,
+        ?string $userId = null,
+        ?string $deviceId = null,
+        ?string $insertId = null,
+        ?int $time = null
+    )
     {
+        if (empty($eventType)) {
+            throw new InvalidArgumentException('Event type cannot be an empty string.');
+        }
+
         $this->eventType = $eventType;
+        $this->eventProperties = $eventProperties;
+        $this->userProperties = $userProperties;
+        $this->userId = $userId;
+        $this->deviceId = $deviceId;
+        $this->insertId = $insertId;
+        $this->time = $time;
     }
 
     /**
-     * @return array<string, mixed>
+     * @return Payload
+     * @throws InvalidArgumentException
      */
     public function toArray(): array
     {
+        if (empty($this->eventType)) {
+            throw new InvalidArgumentException('Event type cannot be an empty string.');
+        }
+
         return array_filter([
             'event_type' => $this->eventType,
             'event_properties' => $this->eventProperties,
             'user_properties' => $this->userProperties,
             'user_id' => $this->userId,
             'device_id' => $this->deviceId,
             'insert_id' => $this->insertId,
-            'time' => $this->time]);
+            'time' => $this->time
+        ]);
+    }
+
+    /**
+     * @param Payload $data
+     */
+    public static function fromArray(array $data): self
+    {
+        return new self(
+            $data['event_type'],
+            $data['event_properties'] ?? null,
+            $data['user_properties'] ?? null,
+            $data['user_id'] ?? null,
+            $data['device_id'] ?? null,
+            $data['insert_id'] ?? null,
+            $data['time'] ?? null
+        );
     }
 
     /**

tests/Amplitude/EventTest.php

@@ -0,0 +1,42 @@
+<?php
+
+declare(strict_types=1);
+
+namespace AmplitudeExperiment\Test\Amplitude;
+
+use AmplitudeExperiment\Amplitude\Event;
+use PHPUnit\Framework\TestCase;
+
+final class EventTest extends TestCase
+{
+    public function testToAndFromArray(): void
+    {
+        $event = new Event(
+            'eventType',
+            ['eventProperty' => 'eventValue'],
+            ['userProperty' => 'userValue'],
+            'userId',
+            'deviceId',
+            'insertId',
+            1234567890
+        );
+
+        $this->assertEquals(
+            [
+                'event_type' => 'eventType',
+                'event_properties' => ['eventProperty' => 'eventValue'],
+                'user_properties' => ['userProperty' => 'userValue'],
+                'user_id' => 'userId',
+                'device_id' => 'deviceId',
+                'insert_id' => 'insertId',
+                'time' => 1234567890
+            ],
+            $event->toArray()
+        );
+
+        $this->assertEquals(
+            $event,
+            Event::fromArray($event->toArray())
+        );
+    }
+}