From da379a58033c0ef3c9c854326a3fca25d6e54319 Mon Sep 17 00:00:00 2001
From: Loek Le Blansch <loek@pipeframe.xyz>
Date: Wed, 20 Nov 2024 22:18:54 +0100
Subject: add Script::subscribe

---
 src/crepe/api/BehaviorScript.hpp |  1 +
 src/crepe/api/CMakeLists.txt     |  1 +
 src/crepe/api/Script.cpp         | 11 +++++++++++
 src/crepe/api/Script.h           | 36 +++++++++++++++++++++++++++++++++---
 src/crepe/api/Script.hpp         |  9 ++++++++-
 5 files changed, 54 insertions(+), 4 deletions(-)
 create mode 100644 src/crepe/api/Script.cpp

diff --git a/src/crepe/api/BehaviorScript.hpp b/src/crepe/api/BehaviorScript.hpp
index d80321d..dd1efd5 100644
--- a/src/crepe/api/BehaviorScript.hpp
+++ b/src/crepe/api/BehaviorScript.hpp
@@ -16,6 +16,7 @@ BehaviorScript & BehaviorScript::set_script() {
 	Script * s = new T();
 	s->game_object_id = this->game_object_id;
 	s->component_manager_ref = &this->component_manager;
+	s->event_manager_ref = &EventManager::get_instance();
 	this->script = std::unique_ptr<Script>(s);
 	return *this;
 }
diff --git a/src/crepe/api/CMakeLists.txt b/src/crepe/api/CMakeLists.txt
index a185ca6..a63c5ff 100644
--- a/src/crepe/api/CMakeLists.txt
+++ b/src/crepe/api/CMakeLists.txt
@@ -23,6 +23,7 @@ target_sources(crepe PUBLIC
 	LoopManager.cpp
 	LoopTimer.cpp
 	EventHandler.cpp
+	Script.cpp
 )
 
 target_sources(crepe PUBLIC FILE_SET HEADERS FILES
diff --git a/src/crepe/api/Script.cpp b/src/crepe/api/Script.cpp
new file mode 100644
index 0000000..9ebb074
--- /dev/null
+++ b/src/crepe/api/Script.cpp
@@ -0,0 +1,11 @@
+#include "Script.h"
+
+using namespace crepe;
+
+Script::~Script() {
+	EventManager & evmgr = *this->event_manager_ref;
+	for (auto id : this->listeners) {
+		evmgr.unsubscribe(id);
+	}
+}
+
diff --git a/src/crepe/api/Script.h b/src/crepe/api/Script.h
index ddb499c..c9eb211 100644
--- a/src/crepe/api/Script.h
+++ b/src/crepe/api/Script.h
@@ -4,6 +4,8 @@
 
 #include "../types.h"
 
+#include "EventManager.h"
+
 namespace crepe {
 
 class ScriptSystem;
@@ -85,6 +87,14 @@ protected:
 	template <typename... Args>
 	void logf(Args &&... args);
 
+	/**
+	 * \brief Subscribe to an event
+	 *
+	 * \see EventManager::subscribe
+	 */
+	template <typename EventType>
+	void subscribe(const EventHandler<EventType> & callback, event_channel_t channel = EventManager::CHANNEL_ALL);
+
 	//! \}
 
 protected:
@@ -93,17 +103,37 @@ protected:
 	Script() = default;
 	//! Only \c BehaviorScript instantiates Script
 	friend class BehaviorScript;
+public:
+	// std::unique_ptr destroys script
+	virtual ~Script();
+
+	Script(const Script &) = delete;
+	Script(Script &&) = delete;
+	Script & operator=(const Script &) = delete;
+	Script & operator=(Script &&) = delete;
 
 private:
-	// These references are set by BehaviorScript immediately after calling the constructor of
-	// Script.
+	/**
+	 * \name Late references
+	 *
+	 * These references are set by BehaviorScript immediately after calling the constructor of
+	 * Script.
+	 *
+	 * \{
+	 */
+	//! Game object ID of game object parent BehaviorScript is attached to
 	game_object_id_t game_object_id = -1;
+	//! Reference to component manager instance
 	ComponentManager * component_manager_ref = nullptr;
-	// TODO: use OptionalRef instead of pointer
+	//! Reference to event manager instance
+	EventManager * event_manager_ref = nullptr;
+	//! \}
 
 private:
 	//! Flag to indicate if \c init() has been called already
 	bool initialized = false;
+	//! List of subscribed events
+	std::vector<subscription_t> listeners;
 };
 
 } // namespace crepe
diff --git a/src/crepe/api/Script.hpp b/src/crepe/api/Script.hpp
index 4593d69..42c8f0b 100644
--- a/src/crepe/api/Script.hpp
+++ b/src/crepe/api/Script.hpp
@@ -20,7 +20,7 @@ T & Script::get_component() const {
 
 template <typename T>
 std::vector<std::reference_wrapper<T>> Script::get_components() const {
-	auto & mgr = *this->component_manager_ref;
+	ComponentManager & mgr = *this->component_manager_ref;
 
 	return mgr.get_components_by_id<T>(this->game_object_id);
 }
@@ -30,4 +30,11 @@ void Script::logf(Args &&... args) {
 	Log::logf(std::forward<Args>(args)...);
 }
 
+template <typename EventType>
+void Script::subscribe(const EventHandler<EventType> & callback, event_channel_t channel) {
+	EventManager & mgr = *this->event_manager_ref;
+	subscription_t listener = mgr.subscribe<EventType>(callback, channel);
+	this->listeners.push_back(listener);
+}
+
 } // namespace crepe
-- 
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