8 files changed, 534 insertions, 0 deletions
diff --git a/mwe/events/src/event.cpp b/mwe/events/src/event.cpp
new file mode 100644
index 0000000..fecae76
--- /dev/null
+++ b/mwe/events/src/event.cpp
@@ -0,0 +1,56 @@
+#include "event.h"
+#include "keyCodes.h"
+// Event class methods
+Event::Event(std::string eventType) {
+    eventData["eventType"] = eventType;
+}
+
+void Event::addArgument(const std::string& key, const std::variant<int, std::string, float>& value) {
+    eventData[key] = value;
+}
+
+std::variant<int, std::string, float> Event::getArgument(const std::string& key) const {
+    return eventData.at(key);
+}
+
+std::string Event::getType() const {
+    return std::get<std::string>(eventData.at("eventType"));
+}
+std::string Event::toString() const {
+    return std::to_string(getEventType());
+}
+bool Event::getHandled() const {
+    return isHandled;
+}
+
+void Event::markHandled() {
+    isHandled = true;
+}
+
+// KeyPressedEvent class methods
+KeyPressedEvent::KeyPressedEvent(int keycode)
+    : Event("KeyPressedEvent"), key(keycode), repeatCount(0) {}
+
+Keycode KeyPressedEvent::getKeyCode() const {
+    return key;
+}
+
+int KeyPressedEvent::getRepeatCount() const {
+    return repeatCount;
+}
+
+// KeyReleasedEvent class methods
+KeyReleasedEvent::KeyReleasedEvent(int keycode)
+    : Event("KeyReleasedEvent"), key(keycode) {}
+
+Keycode KeyReleasedEvent::getKeyCode() const {
+    return key;
+}
+
+// MousePressedEvent class methods
+MousePressedEvent::MousePressedEvent(int mouseX, int mouseY)
+    : Event("MousePressedEvent"), mouseX(mouseX), mouseY(mouseY) {}
+
+std::pair<int, int> MousePressedEvent::getMousePosition() const {
+    return {mouseX, mouseY};
+}
diff --git a/mwe/events/src/eventHandler.cpp b/mwe/events/src/eventHandler.cpp
new file mode 100644
index 0000000..7040d8d
--- /dev/null
+++ b/mwe/events/src/eventHandler.cpp
@@ -0,0 +1,5 @@
+#include "eventHandler.h"
+void  IEventHandlerWrapper::exec(const Event& e)
+    {
+        call(e);
+    }
diff --git a/mwe/events/src/eventManager.cpp b/mwe/events/src/eventManager.cpp
new file mode 100644
index 0000000..ce8e940
--- /dev/null
+++ b/mwe/events/src/eventManager.cpp
@@ -0,0 +1,109 @@
+#include "eventManager.h"
+
+void EventManager::shutdown()
+{
+    m_subscribers.clear();
+}
+
+void EventManager::subscribe(int eventType, std::unique_ptr<IEventHandlerWrapper>&& handler, int eventId)
+{
+    if (eventId) {
+        std::unordered_map<int, std::unordered_map<int, std::vector<std::unique_ptr<IEventHandlerWrapper>>>>::iterator subscribers = m_subscribersByEventId.find(eventType);
+
+        if (subscribers != m_subscribersByEventId.end()) {
+            std::unordered_map<int, std::vector<std::unique_ptr<IEventHandlerWrapper>>>& handlersMap = subscribers->second;
+            std::unordered_map<int, std::vector<std::unique_ptr<IEventHandlerWrapper>>>::iterator handlers = handlersMap.find(eventId);
+            if (handlers != handlersMap.end()) {
+                handlers->second.emplace_back(std::move(handler));
+                return;
+            }
+        }
+        m_subscribersByEventId[eventType][eventId].emplace_back(std::move(handler));
+
+    } else {
+        std::unordered_map<int, std::vector<std::unique_ptr<IEventHandlerWrapper>>>::iterator subscribers = m_subscribers.find(eventType);
+        if (subscribers != m_subscribers.end()) {
+            std::vector<std::unique_ptr<IEventHandlerWrapper>>& handlers = subscribers->second;
+            for (std::unique_ptr<IEventHandlerWrapper>& it : handlers) {
+                if (it->getType() == handler->getType()) {
+                    // log for double register
+                    return;
+                }
+            }
+            handlers.emplace_back(std::move(handler));
+        } else {
+            m_subscribers[eventType].emplace_back(std::move(handler));
+        }
+    }
+}
+
+void EventManager::unsubscribe(int eventType, const std::string& handlerName, int eventId)
+{
+    if (eventId) {
+        std::unordered_map<int, std::unordered_map<int, std::vector<std::unique_ptr<IEventHandlerWrapper>>>>::iterator subscribers = m_subscribersByEventId.find(eventType);
+        if (subscribers != m_subscribersByEventId.end()) {
+            std::unordered_map<int, std::vector<std::unique_ptr<IEventHandlerWrapper>>>& handlersMap = subscribers->second;
+            std::unordered_map<int, std::vector<std::unique_ptr<IEventHandlerWrapper>>>::iterator handlers = handlersMap.find(eventId);
+            if (handlers != handlersMap.end()) {
+                std::vector<std::unique_ptr<IEventHandlerWrapper>>& callbacks = handlers->second;
+                for (std::vector<std::unique_ptr<IEventHandlerWrapper>>::iterator it = callbacks.begin(); it != callbacks.end(); ++it) {
+                    if (it->get()->getType() == handlerName) {
+                        it = callbacks.erase(it);
+                        return;
+                    }
+                }
+            }
+        }
+    } else {
+        std::unordered_map<int, std::vector<std::unique_ptr<IEventHandlerWrapper>>>::iterator handlersIt = m_subscribers.find(eventType);
+        if (handlersIt != m_subscribers.end()) {
+            std::vector<std::unique_ptr<IEventHandlerWrapper>>& handlers = handlersIt->second;
+            for (std::vector<std::unique_ptr<IEventHandlerWrapper>>::iterator it = handlers.begin(); it != handlers.end(); ++it) {
+                if (it->get()->getType() == handlerName) {
+                    it = handlers.erase(it);
+                    return;
+                }
+            }
+        }
+    }
+}
+
+void EventManager::triggerEvent(const Event& event_, int eventId)
+{
+    std::vector<std::unique_ptr<IEventHandlerWrapper>>& handlers = m_subscribers[event_.getEventType()];
+    for (std::unique_ptr<IEventHandlerWrapper>& handler : handlers) {
+        handler->exec(event_);
+    }
+
+    std::unordered_map<int, std::vector<std::unique_ptr<IEventHandlerWrapper>>>& handlersMap = m_subscribersByEventId[event_.getEventType()];
+    std::unordered_map<int, std::vector<std::unique_ptr<IEventHandlerWrapper>>>::iterator handlersIt = handlersMap.find(eventId);
+    if (handlersIt != handlersMap.end()) {
+        std::vector<std::unique_ptr<IEventHandlerWrapper>>& callbacks = handlersIt->second;
+        for (std::vector<std::unique_ptr<IEventHandlerWrapper>>::iterator it = callbacks.begin(); it != callbacks.end();) {
+            std::unique_ptr<IEventHandlerWrapper>& handler = *it;
+            handler->exec(event_);
+            if (handler->isDestroyOnSuccess()) {
+                it = callbacks.erase(it);
+            } else {
+                ++it;
+            }
+        }
+    }
+}
+
+void EventManager::queueEvent(std::unique_ptr<Event>&& event_, int eventId)
+{
+    m_eventsQueue.emplace_back(std::move(event_), eventId);
+}
+
+void EventManager::dispatchEvents()
+{
+    for (std::vector<std::pair<std::unique_ptr<Event>, int>>::iterator eventIt = m_eventsQueue.begin(); eventIt != m_eventsQueue.end();) {
+        if (!eventIt->first.get()->getHandled()) {
+            triggerEvent(*eventIt->first.get(), eventIt->second);
+            eventIt = m_eventsQueue.erase(eventIt);
+        } else {
+            ++eventIt;
+        }
+    }
+}
diff --git a/mwe/events/src/keyCodes.cpp b/mwe/events/src/keyCodes.cpp
new file mode 100644
index 0000000..6f35d11
--- /dev/null
+++ b/mwe/events/src/keyCodes.cpp
@@ -0,0 +1,140 @@
+#include "keyCodes.h"
+
+const std::unordered_map<SDL_Keycode, Keycode> sdlToCustom = {
+    { SDLK_SPACE, Space },
+    { SDLK_QUOTE, Apostrophe },
+    { SDLK_COMMA, Comma },
+    { SDLK_MINUS, Minus },
+    { SDLK_PERIOD, Period },
+    { SDLK_SLASH, Slash },
+
+    { SDLK_0, D0 },
+    { SDLK_1, D1 },
+    { SDLK_2, D2 },
+    { SDLK_3, D3 },
+    { SDLK_4, D4 },
+    { SDLK_5, D5 },
+    { SDLK_6, D6 },
+    { SDLK_7, D7 },
+    { SDLK_8, D8 },
+    { SDLK_9, D9 },
+
+    { SDLK_SEMICOLON, Semicolon },
+    { SDLK_EQUALS, Equal },
+
+    { SDLK_a, A },
+    { SDLK_b, B },
+    { SDLK_c, C },
+    { SDLK_d, D },
+    { SDLK_e, E },
+    { SDLK_f, F },
+    { SDLK_g, G },
+    { SDLK_h, H },
+    { SDLK_i, I },
+    { SDLK_j, J },
+    { SDLK_k, K },
+    { SDLK_l, L },
+    { SDLK_m, M },
+    { SDLK_n, N },
+    { SDLK_o, O },
+    { SDLK_p, P },
+    { SDLK_q, Q },
+    { SDLK_r, R },
+    { SDLK_s, S },
+    { SDLK_t, T },
+    { SDLK_u, U },
+    { SDLK_v, V },
+    { SDLK_w, W },
+    { SDLK_x, X },
+    { SDLK_y, Y },
+    { SDLK_z, Z },
+
+    { SDLK_LEFTBRACKET, LeftBracket },
+    { SDLK_BACKSLASH, Backslash },
+    { SDLK_RIGHTBRACKET, RightBracket },
+    { SDLK_BACKQUOTE, GraveAccent },
+
+    { SDLK_ESCAPE, Escape },
+    { SDLK_RETURN, Enter },
+    { SDLK_TAB, Tab },
+    { SDLK_BACKSPACE, Backspace },
+    { SDLK_INSERT, Insert },
+    { SDLK_DELETE, Delete },
+    { SDLK_RIGHT, Right },
+    { SDLK_LEFT, Left },
+    { SDLK_DOWN, Down },
+    { SDLK_UP, Up },
+    { SDLK_PAGEUP, PageUp },
+    { SDLK_PAGEDOWN, PageDown },
+    { SDLK_HOME, Home },
+    { SDLK_END, End },
+
+    { SDLK_CAPSLOCK, CapsLock },
+    { SDLK_SCROLLLOCK, ScrollLock },
+    { SDLK_NUMLOCKCLEAR, NumLock },
+    { SDLK_PRINTSCREEN, PrintScreen },
+    { SDLK_PAUSE, Pause },
+
+    { SDLK_F1, F1 },
+    { SDLK_F2, F2 },
+    { SDLK_F3, F3 },
+    { SDLK_F4, F4 },
+    { SDLK_F5, F5 },
+    { SDLK_F6, F6 },
+    { SDLK_F7, F7 },
+    { SDLK_F8, F8 },
+    { SDLK_F9, F9 },
+    { SDLK_F10, F10 },
+    { SDLK_F11, F11 },
+    { SDLK_F12, F12 },
+    { SDLK_F13, F13 },
+    { SDLK_F14, F14 },
+    { SDLK_F15, F15 },
+    { SDLK_F16, F16 },
+    { SDLK_F17, F17 },
+    { SDLK_F18, F18 },
+    { SDLK_F19, F19 },
+    { SDLK_F20, F20 },
+    { SDLK_F21, F21 },
+    { SDLK_F22, F22 },
+    { SDLK_F23, F23 },
+    { SDLK_F24, F24 },
+
+    { SDLK_KP_0, KP0 },
+    { SDLK_KP_1, KP1 },
+    { SDLK_KP_2, KP2 },
+    { SDLK_KP_3, KP3 },
+    { SDLK_KP_4, KP4 },
+    { SDLK_KP_5, KP5 },
+    { SDLK_KP_6, KP6 },
+    { SDLK_KP_7, KP7 },
+    { SDLK_KP_8, KP8 },
+    { SDLK_KP_9, KP9 },
+
+    { SDLK_KP_DECIMAL, KPDecimal },
+    { SDLK_KP_DIVIDE, KPDivide },
+    { SDLK_KP_MULTIPLY, KPMultiply },
+    { SDLK_KP_MINUS, KPSubtract },
+    { SDLK_KP_PLUS, KPAdd },
+    { SDLK_KP_ENTER, KPEnter },
+    { SDLK_KP_EQUALS, KPEqual },
+
+    { SDLK_LSHIFT, LeftShift },
+    { SDLK_LCTRL, LeftControl },
+    { SDLK_LALT, LeftAlt },
+    { SDLK_LGUI, LeftSuper },
+
+    { SDLK_RSHIFT, RightShift },
+    { SDLK_RCTRL, RightControl },
+    { SDLK_RALT, RightAlt },
+    { SDLK_RGUI, RightSuper },
+
+    { SDLK_MENU, Menu }
+};
+Keycode getCustomKey(SDL_Keycode sdlKey) {
+    auto it = sdlToCustom.find(sdlKey);
+    if (it != sdlToCustom.end()) {
+        return it->second;
+    }
+    return 0;
+}
diff --git a/mwe/events/src/loopManager.cpp b/mwe/events/src/loopManager.cpp
new file mode 100644
index 0000000..6defda0
--- /dev/null
+++ b/mwe/events/src/loopManager.cpp
@@ -0,0 +1,90 @@
+#include "loopManager.h"
+
+LoopManager::LoopManager() {}
+void LoopManager::processInput() {
+	SDL_Event event;
+	SDL_PollEvent(&event);
+	switch (event.type) {
+		case SDL_QUIT:
+			gameRunning = false;
+			break;
+		case SDL_KEYDOWN:
+			triggerEvent(KeyPressedEvent(getCustomKey(event.key.keysym.sym)));
+			break;
+		case SDL_MOUSEBUTTONDOWN:
+            int x, y;
+            SDL_GetMouseState(&x, &y); 
+            triggerEvent(MousePressedEvent(x, y)); 
+            break;
+	}
+}
+void LoopManager::setRunning(bool running){
+	this->gameRunning = running;
+}
+void LoopManager::fixedUpdate() { 
+	//fprintf(stderr, "fixed update\n"); 
+}
+void LoopManager::loop() {
+	LoopTimer & timer = LoopTimer::getInstance();
+	timer.start();
+
+	while (gameRunning) {
+		timer.update();
+
+		while (timer.getLag() >= timer.getFixedDeltaTime()) {
+			processInput();
+			fixedUpdate();
+			timer.advanceFixedUpdate();
+		}
+
+		update();
+		render();
+
+		timer.enforceFrameRate();
+	}
+
+	window.destroyWindow();
+}
+void onKey(const KeyPressedEvent& e)
+{
+   	int keyCode = e.getKeyCode();
+	std::cout << "keycode pressed: " << keyCode << std::endl;
+
+}
+void onMouse(const MousePressedEvent& e){
+		fprintf(stderr, "mouse Position X: %d Y: %d\n", e.getMousePosition().first, e.getMousePosition().second);
+}
+void LoopManager::setup() {
+	gameRunning = window.initWindow();
+	LoopTimer::getInstance().start();
+	LoopTimer::getInstance().setFPS(50);
+	EventHandler<KeyPressedEvent> callback = onKey;
+    subscribe<KeyPressedEvent>(callback,false);
+	EventHandler<MousePressedEvent> mouseCallback = onMouse;
+    subscribe<MousePressedEvent>(mouseCallback ,false);
+	EventHandler<KeyPressedEvent> closeWindowCallback = [this](const KeyPressedEvent& e) {
+		if(e.getKeyCode() == Escape){
+			this->setRunning(false);
+		}
+    };
+    subscribe<KeyPressedEvent>(closeWindowCallback,false);
+
+}
+void LoopManager::render() {
+	//fprintf(stderr, "**********render********** \n");
+	if (gameRunning) {
+		//window.render(objectList);
+	}
+}
+
+void LoopManager::update() {
+	//fprintf(stderr, "**********normal update********** \n");
+	LoopTimer & timer = LoopTimer::getInstance();
+
+	float delta = timer.getDeltaTime();
+
+	// for (int i = 0; i < objectList.size(); i++) {
+	// 	objectList[i]->setX(objectList[i]->getX() + 50 * delta);
+	// 	objectList[i]->setY(objectList[i]->getY() + 50 * delta);
+	// }
+}
diff --git a/mwe/events/src/main.cpp b/mwe/events/src/main.cpp
new file mode 100644
index 0000000..3940c60
--- /dev/null
+++ b/mwe/events/src/main.cpp
@@ -0,0 +1,50 @@
+#include <SDL2/SDL.h>
+#include <iostream>
+#include <memory>
+#include "loopManager.h"
+#include "event.h"
+
+class PlayerDamagedEvent : public Event {
+public:
+    PlayerDamagedEvent(int damage, int playerID)
+        : Event("PlayerDamaged"), damage(damage), playerID(playerID) {}
+
+    REGISTER_EVENT_TYPE(PlayerDamagedEvent);
+
+    int getDamage() const { return damage; }
+    int getPlayerID() const { return playerID; }
+
+private:
+    int damage;
+    int playerID;
+};
+void onPlayerDamaged(const PlayerDamagedEvent& e) {
+    std::cout << "Player " << e.getPlayerID() << " took " << e.getDamage() << " damage." << std::endl;
+}
+
+void onKeyPressed(const KeyPressedEvent& e)
+{
+   const int keyCode = e.getKeyCode();
+	fprintf(stderr,"KeyCode %d\n",keyCode);
+}
+int main(int argc, char* args[]) {
+	LoopManager gameLoop;
+	// Create an event handler for KeyPressedEvent
+    // EventHandler<KeyPressedEvent> callback = [](const KeyPressedEvent& e) {
+    //     onKeyPressed(e);
+    // };
+	// custom event class poc
+	EventHandler<PlayerDamagedEvent> playerDamagedHandler = onPlayerDamaged;
+	subscribe<PlayerDamagedEvent>(playerDamagedHandler);
+
+	triggerEvent(PlayerDamagedEvent(50, 1));
+	//EventHandler<KeyPressedEvent> callback = onKeyPressed;
+    //subscribe<KeyPressedEvent>(callback,false);
+	std::unique_ptr<Event> anotherKeyPressEvent = std::make_unique<KeyPressedEvent>(65);
+    queueEvent(std::move(anotherKeyPressEvent));
+    triggerEvent(KeyPressedEvent(42));
+	EventManager::getInstance().dispatchEvents();
+	gameLoop.setup();
+	gameLoop.loop();
+    return 0;
+}
diff --git a/mwe/events/src/timer.cpp b/mwe/events/src/timer.cpp
new file mode 100644
index 0000000..f4fee23
--- /dev/null
+++ b/mwe/events/src/timer.cpp
@@ -0,0 +1,54 @@
+#include "timer.h"
+
+LoopTimer::LoopTimer() {}
+LoopTimer & LoopTimer::getInstance() {
+	static LoopTimer instance;
+	return instance;
+}
+
+void LoopTimer::start() {
+	lastFrameTime = SDL_GetTicks64();
+	elapsedTime = 0;
+	elapsedFixedTime = 0;
+	deltaTime = 0;
+}
+
+// Update the timer, calculate deltaTime
+void LoopTimer::update() {
+	uint64_t currentFrameTime = SDL_GetTicks64();
+	deltaTime
+		= (currentFrameTime - lastFrameTime) / 1000.0;
+
+	if (deltaTime > maximumDeltaTime) {
+		deltaTime = maximumDeltaTime;
+	}
+
+	elapsedTime += deltaTime;
+	lastFrameTime = currentFrameTime;
+}
+
+double LoopTimer::getDeltaTime() const { return deltaTime; }
+int LoopTimer::getCurrentTime() const { return SDL_GetTicks(); }
+
+void LoopTimer::advanceFixedUpdate() { elapsedFixedTime += fixedDeltaTime; }
+
+double LoopTimer::getFixedDeltaTime() const { return fixedDeltaTime; }
+
+void LoopTimer::setFPS(int FPS) {
+	this->FPS = FPS;
+	frameTargetTime = 1.0 / FPS;
+}
+
+int LoopTimer::getFPS() const { return FPS; }
+
+void LoopTimer::enforceFrameRate() {
+	uint64_t currentFrameTime = SDL_GetTicks64();
+	double frameDuration = (currentFrameTime - lastFrameTime) / 1000.0;
+
+	if (frameDuration < frameTargetTime) {
+		uint32_t delayTime
+			= (uint32_t) ((frameTargetTime - frameDuration) * 1000.0);
+		SDL_Delay(delayTime);
+	}
+}
+double LoopTimer::getLag() const { return elapsedTime - elapsedFixedTime; }
diff --git a/mwe/events/src/window.cpp b/mwe/events/src/window.cpp
new file mode 100644
index 0000000..9cafd57
--- /dev/null
+++ b/mwe/events/src/window.cpp
@@ -0,0 +1,30 @@
+#include "window.h"
+WindowManager::WindowManager() {
+}
+WindowManager::~WindowManager() { destroyWindow(); }
+SDL_Renderer * WindowManager::getRenderer() { return renderer; }
+
+bool WindowManager::initWindow() {
+	if (SDL_Init(SDL_INIT_EVERYTHING) != 0) {
+		fprintf(stderr, "Error inititalising SDL.\n");
+		return false;
+	}
+	window = SDL_CreateWindow("SDL Tutorial", SDL_WINDOWPOS_UNDEFINED,
+							  SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH,
+							  SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
+	if (!window) {
+		fprintf(stderr, "Error creating SDL Window. \n");
+		return false;
+	}
+	renderer = SDL_CreateRenderer(window, -1, 0);
+	if (!renderer) {
+		fprintf(stderr, "Error creating SDL renderer. \n");
+		return false;
+	}
+	return true;
+}
+void WindowManager::destroyWindow() {
+	SDL_DestroyRenderer(renderer);
+	SDL_DestroyWindow(window);
+	SDL_Quit();
+}