[PHP] [StepStrategy] Implement the StepType hirearchy with a temporary approach to be able to finally pivot to the desired state

Author: JavierCane

examples/php/php-step_strategy-02_replace_type_code_with_strategy/src/ExerciseStepType.php

@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\StepStrategy;
+
+final class ExerciseStepType
+{
+    public function code(): int
+    {
+        return Step::EXERCISE_STEP_TYPE;
+    }
+}

examples/php/php-step_strategy-02_replace_type_code_with_strategy/src/QuizStepType.php

@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\StepStrategy;
+
+final class QuizStepType
+{
+    private array $quizQuestions;
+
+    public function __construct(array $quizQuestions)
+    {
+        $this->quizQuestions = $quizQuestions;
+    }
+
+    public function code(): int
+    {
+        return Step::QUIZ_STEP_TYPE;
+    }
+}

examples/php/php-step_strategy-02_replace_type_code_with_strategy/src/Step.php

@@ -9,12 +9,12 @@ final class Step
     private const EXERCISE_STEP_DURATION_ESTIMATION_IN_MINUTES = 30;
     private const QUIZ_STEP_QUESTION_DURATION_ESTIMATION_IN_MINUTES = 3;
 
-    private const VIDEO_STEP_TYPE = 0;
-    private const QUIZ_STEP_TYPE = 1;
-    private const EXERCISE_STEP_TYPE = 2;
+    public const VIDEO_STEP_TYPE = 0;
+    public const QUIZ_STEP_TYPE = 1;
+    public const EXERCISE_STEP_TYPE = 2;
 
-    private string $title;
-    private int    $type;
+    private string  $title;
+    private int     $type;
     private ?int    $videoDurationInMinutes;
     private ?array  $quizQuestions;
 

examples/php/php-step_strategy-02_replace_type_code_with_strategy/src/StepType.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\StepStrategy;
+
+use InvalidArgumentException;
+
+abstract class StepType
+{
+    public static function fromPrimitive(int $code, ?int $videoDurationInMinutes, ?array $quizQuestions)
+    {
+        switch ($code) {
+            case Step::VIDEO_STEP_TYPE:
+                return new VideoStepType($videoDurationInMinutes);
+            case Step::QUIZ_STEP_TYPE:
+                return new QuizStepType($quizQuestions);
+            case Step::EXERCISE_STEP_TYPE:
+                return new ExerciseStepType();
+            default:
+                throw new InvalidArgumentException("Unrecognized Step type code");
+        }
+    }
+
+    abstract public function code(): int;
+}

examples/php/php-step_strategy-02_replace_type_code_with_strategy/src/VideoStepType.php

@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\StepStrategy;
+
+final class VideoStepType extends StepType
+{
+    private int $videoDurationInMinutes;
+
+    public function __construct(int $videoDurationInMinutes)
+    {
+        $this->videoDurationInMinutes = $videoDurationInMinutes;
+    }
+
+    public function code(): int
+    {
+        return Step::VIDEO_STEP_TYPE;
+    }
+}