Refactor to a single $targets array

src/Attributes/Hooks/Apply.php

@@ -20,6 +20,6 @@ public function __construct(
 
     public function applyToHook(Hook $hook): void
     {
-        $hook->states[] = $this->state_type;
+        $hook->targets[] = $this->state_type;
     }
 }

src/Attributes/Hooks/Listen.php

@@ -20,6 +20,6 @@ public function __construct(
 
     public function applyToHook(Hook $hook): void
     {
-        $hook->events[] = $this->event_type;
+        $hook->targets[] = $this->event_type;
     }
 }

src/Lifecycle/Dispatcher.php

@@ -24,11 +24,8 @@ public function __construct(
     public function register(object $target): void
     {
         foreach (Reflector::getHooks($target) as $hook) {
-            foreach ($hook->events as $event_type) {
-                $this->hooks[$event_type][] = $hook;
-            }
-            foreach ($hook->states as $state_type) {
-                $this->hooks[$state_type][] = $hook;
+            foreach ($hook->targets as $fqcn) {
+                $this->hooks[$fqcn][] = $hook;
             }
         }
     }
@@ -166,7 +163,9 @@ protected function hooksWithPrefix(Event|State $target, Phase $phase, string $pr
     /** @return Collection<int, Hook> */
     protected function hooksFor(Event|State $target, ?Phase $phase = null): Collection
     {
-        return Collection::make($this->hooks[$target::class] ?? [])
+        return Collection::make($this->hooks)
+            ->only(Reflector::getClassInstanceOf($target))
+            ->flatten()
             ->when($phase, fn (Collection $hooks) => $hooks->filter(fn (Hook $hook) => $hook->runsInPhase($phase)));
     }
 

src/Lifecycle/Hook.php

@@ -22,8 +22,7 @@ public static function fromClassMethod(object $target, ReflectionMethod|string $
 
         $hook = new static(
             callback: Closure::fromCallable([$target, $method->getName()]),
-            events: Reflector::getEventParameters($method),
-            states: Reflector::getStateParameters($method),
+            targets: Reflector::getParameterTypes($method),
             name: $method->getName(),
         );
 
@@ -34,17 +33,15 @@ public static function fromClosure(Closure $callback): static
     {
         $hook = new static(
             callback: $callback,
-            events: Reflector::getEventParameters($callback),
-            states: Reflector::getStateParameters($callback),
+            targets: Reflector::getParameterTypes($callback),
         );
 
         return Reflector::applyHookAttributes($callback, $hook);
     }
 
     public function __construct(
         public Closure $callback,
-        public array $events = [],
-        public array $states = [],
+        public array $targets = [],
         public SplObjectStorage $phases = new SplObjectStorage,
         public ?string $name = null,
     ) {}

src/Support/Reflector.php

@@ -42,6 +42,23 @@ public static function getStateParameters(ReflectionFunctionAbstract|Closure $me
         return static::getParametersOfType(State::class, $method)->values()->all();
     }
 
+    public static function getParameterTypes(ReflectionFunctionAbstract|Closure $method): array
+    {
+        $method = static::reflectFunction($method);
+
+        if (empty($parameters = $method->getParameters())) {
+            return [];
+        }
+
+        return Collection::make($parameters)
+            ->map(fn (ReflectionParameter $parameter) => static::getParameterClassNames($parameter))
+            ->flatten()
+            ->filter()
+            ->unique()
+            ->values()
+            ->toArray();
+    }
+
     public static function applyHookAttributes(ReflectionFunctionAbstract|Closure $method, Hook $hook): Hook
     {
         $method = static::reflectFunction($method);
@@ -80,6 +97,20 @@ public static function getParametersOfType(string $type, ReflectionFunctionAbstr
             ->map(fn (array $names) => Arr::first($names));
     }
 
+    /** @return class-string[] */
+    public static function getClassInstanceOf(string|object $class): array
+    {
+        $reflection = new ReflectionClass($class);
+
+        $class_and_interface_names = array_unique($reflection->getInterfaceNames());
+
+        do {
+            $class_and_interface_names[] = $reflection->getName();
+        } while ($reflection = $reflection->getParentClass());
+
+        return $class_and_interface_names;
+    }
+
     protected static function reflectFunction(ReflectionFunctionAbstract|Closure $function): ReflectionFunctionAbstract
     {
         if ($function instanceof Closure) {

tests/Feature/HooksClassHierarchyTest.php

@@ -0,0 +1,60 @@
+<?php
+
+use Thunk\Verbs\Attributes\Hooks\On;
+use Thunk\Verbs\Event;
+use Thunk\Verbs\Lifecycle\Dispatcher;
+use Thunk\Verbs\Lifecycle\Phase;
+
+it('can match events by type-hinting a specific class', function () {
+    app(Dispatcher::class)->register(new HooksClassHierarchyTestOneListener);
+
+    expect(fn () => HooksClassHierarchyTestEvent1::fire())->toThrow(RuntimeException::class, 'one')
+        ->and(fn () => HooksClassHierarchyTestEvent2::fire())->not->toThrow(RuntimeException::class);
+});
+
+it('can match events by type-hinting an interface', function () {
+    app(Dispatcher::class)->register(new HooksClassHierarchyTestInterfaceListener);
+
+    expect(fn () => HooksClassHierarchyTestEvent1::fire())->not->toThrow(RuntimeException::class)
+        ->and(fn () => HooksClassHierarchyTestEvent2::fire())->toThrow(RuntimeException::class, 'interface');
+});
+
+it('can match all events by type-hinting the base class', function () {
+    app(Dispatcher::class)->register(new HooksClassHierarchyTestEveryListener);
+
+    expect(fn () => HooksClassHierarchyTestEvent1::fire())->toThrow(RuntimeException::class, 'every')
+        ->and(fn () => HooksClassHierarchyTestEvent2::fire())->toThrow(RuntimeException::class, 'every');
+});
+
+interface HooksClassHierarchyTestInterface {}
+
+class HooksClassHierarchyTestEvent1 extends Event {}
+
+class HooksClassHierarchyTestEvent2 extends Event implements HooksClassHierarchyTestInterface {}
+
+class HooksClassHierarchyTestOneListener
+{
+    #[On(Phase::Validate)]
+    public static function one(HooksClassHierarchyTestEvent1 $event)
+    {
+        throw new RuntimeException('one');
+    }
+}
+
+class HooksClassHierarchyTestInterfaceListener
+{
+    #[On(Phase::Validate)]
+    public static function interface(HooksClassHierarchyTestInterface $event)
+    {
+        throw new RuntimeException('interface');
+    }
+}
+
+class HooksClassHierarchyTestEveryListener
+{
+    #[On(Phase::Validate)]
+    public static function every(Event $event)
+    {
+        throw new RuntimeException('every');
+    }
+}