From 98b8d3cebb09adb8f4f52c2f344570c1f3dd6f9a Mon Sep 17 00:00:00 2001
From: ProgramSnail <purpurebacterium@yandex.ru>
Date: Mon, 29 Mar 2021 23:43:14 +0300
Subject: [PATCH] Added Event Center

---
 src/game/game_events.cpp |   5 ++
 src/game/game_events.hpp | 108 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 113 insertions(+)

diff --git a/src/game/game_events.cpp b/src/game/game_events.cpp
index e69de29..40c681a 100644
--- a/src/game/game_events.cpp
+++ b/src/game/game_events.cpp
@@ -0,0 +1,5 @@
+#include "game_events.hpp"
+
+namespace events {
+    
+}
\ No newline at end of file
diff --git a/src/game/game_events.hpp b/src/game/game_events.hpp
index e69de29..94f8c59 100644
--- a/src/game/game_events.hpp
+++ b/src/game/game_events.hpp
@@ -0,0 +1,108 @@
+#include <set>
+#include <functional>
+#include <string>
+#include <map>
+
+#pragma once
+
+namespace events {
+    class EventId {
+    private:
+        std::string name = "";
+
+        int nameHash = std::hash<std::string>{}("");
+
+    public:
+        EventId() = default;
+
+        EventId(std::string name) : name(name) {
+            nameHash = std::hash<std::string>{}(name);
+        }
+
+        bool operator==(const EventId& eId) const {
+            return nameHash == eId.nameHash && name == eId.name;
+        }
+
+        bool operator!=(const EventId& eId) const {
+            return !operator==(eId);
+        }
+    };
+
+    class EventData { // may be changed
+    private:
+        using T = int;
+
+        std::map<std::string, T> data;
+
+    public:
+        EventData() {}
+
+        void setField(const std::string& key, const T& value) {
+            data[key] = value;
+        }
+
+        const T& getField(const std::string& key) {
+            return data[key];
+        }
+    };
+
+    class Event {
+    private:
+        EventId id;
+
+        EventData data;
+
+    public:
+        Event(const EventId& id, const EventData& data) :
+            id(id), data(data) {}
+
+        bool isId(const EventId& eId) const {
+            return id == eId; 
+        }
+
+        EventData& getData() {
+            return data;
+        }
+
+        const EventData& getData() const {
+            return data;
+        }
+    };
+
+    class EventHandler {
+    private:
+        std::function<void(const EventData&)> handler;
+
+        EventId eventId;
+    public:
+        EventHandler(std::function<void(const EventData&)> handler,
+            const EventId& eventId) : handler(handler), eventId(eventId) {}
+            
+        bool handleEvent(const Event& event) {
+            if (event.isId(eventId)) {
+                handler(event.getData());
+                return true;
+            }
+            return false;
+        }
+    };
+
+    class EventCenter {
+    private:
+        std::set<EventHandler> handlers;
+    public:
+        void addEventHandler(const EventHandler& handler) {
+            handlers.insert(handler);
+        }
+
+        void removeEventHandler(const EventHandler& handler) {
+            handlers.erase(handler);
+        }
+
+        void invokeEvent(const Event& event) {
+            for (auto handler : handlers) {
+                handler.handleEvent(event);
+            }
+        }
+    };
+}
\ No newline at end of file