Implemented the transition system

Transitions being a way to allow for automatic state change and allow
for a way to allow or forbbid a transition between two states

include/state-machine_pool.hpp

@@ -1,7 +1,12 @@
 #ifndef STATEMACHINE_POOL_HPP
 #define STATEMACHINE_POOL_HPP
 
+#include "state.hpp"
 #include "state_machine.hpp"
+#include <functional>
+#include <iostream>
+#include <ostream>
+#include <unordered_map>
 
 template<typename StateOwnerType>
 class StateMachinePool {
@@ -15,16 +20,46 @@ class StateMachinePool {
             machines.erase(id);
         }
 
+        void AddTransition(Transition<StateOwnerType> &transition) {
+            std::string from = transition.from;
+            std::string to = transition.target_state;
+            std::function <bool (const StateOwnerType&)> condition;
+
+            transitions[from].push_back(transition);
+        }
+
         void UpdateAll() {
-            for (const auto &[id, machine] : machines)
+            for (const auto &[id, machine] : machines) {
+                auto &owner = machine->GetOwner();
+                const std::string &current = machine->GetCurrentStateId();
+
+                auto it = transitions.find(current);
+                if (it != transitions.end() && auto_transition == true)
+                    for (const auto &transition : it->second)
+                        if (transition.condition(owner)) {
+                            machine->ChangeState(transition.target_state);
+                            break;
+                        }
                 machine->Update();
+            }
         }
 
         void ChangeState(const std::string &id, const std::string &stateId) {
             auto it = machines.find(id);
+            const std::string current = it->second->GetCurrentStateId();
+            auto &owner = it->second->GetOwner();
 
-            if (it != machines.end())
+            bool allowed = true;
+            auto transitions_it = transitions.find(current);
+            if (strict_transition && (transitions_it != transitions.end())) {
+                for (const auto &transition : transitions_it->second)
+                    if (!transition.condition(owner))
+                        allowed = false;
+            }
+
+            if (it != machines.end() && allowed) {
                 it->second->ChangeState(stateId);
+            }
         }
 
         void RevertState(const std::string &id) {
@@ -88,17 +123,19 @@ class StateMachinePool {
         }
 
         void SetStrictTransitions(bool enabled) {
-            strict_transition = enabled;
+            this->strict_transition = enabled;
+        }
 
-            for (auto &[_, machine] : machines)
-                machine->SetStrictTransitions(enabled);
+        bool GetStrictTransitions() const {
+            return strict_transition;
         }
 
         void SetAutoTransitions(bool enabled) {
-            auto_transition = enabled;
+            this->auto_transition = enabled;
+        }
 
-            for (const auto &[_, machine] : machines)
-                machine->SetAutoTransitions(enabled);
+        bool GetAutoTransitions() const {
+            return auto_transition;
         }
 
     private:
@@ -106,6 +143,7 @@ class StateMachinePool {
         std::unordered_map<std::string, std::unique_ptr<StateMachine<StateOwnerType>>> machines;
         bool auto_transition = false;
         bool strict_transition = false;
+        std::unordered_map<std::string, std::vector<Transition<StateOwnerType>>> transitions;
 };
 
 #endif // STATEMACHINE_POOL_HPP

include/state.hpp

@@ -7,6 +7,7 @@
 
 template <typename Type>
 struct Transition {
+    const std::string from;
     const std::string target_state;
     const std::function<bool (const Type&)> condition;
 };
@@ -20,10 +21,6 @@ class State {
         virtual void OnUpdate(OwnerType &owner) = 0;
         virtual void OnExit(OwnerType &owner) = 0;
 
-        virtual void AddTransition(const std::string &to,
-                std::function<bool (const OwnerType&)> condition) = 0;
-        virtual std::vector<Transition<OwnerType>> GetTransitions() = 0;
-
         virtual std::string Id() const = 0;
 };
 
@@ -32,20 +29,11 @@ class AState : public State<OwnerType> {
     public:
         AState(const std::string &id) : entity_id(id) {};
 
-        void AddTransition(const std::string &to,
-                std::function<bool (const OwnerType&)> condition) override {
-            transitions.push_back({ to, condition });
-        }
-        std::vector<Transition<OwnerType>> GetTransitions() override {
-            return transitions;
-        }
-
         std::string Id() const override {
             return entity_id;
         }
 
     private:
-        std::vector<Transition<OwnerType>> transitions;
         std::string entity_id;
 };
 

include/state_machine.hpp

@@ -3,10 +3,12 @@
 
 #include <string>
 #include <memory>
+#include <unordered_map>
 #include <vector>
 
 #include <nlohmann/json.hpp>
 
+#include "state.hpp"
 #include "state_factory.hpp"
 
 using json = nlohmann::json;
@@ -21,19 +23,6 @@ class StateMachine {
             if (!new_state)
                 return;
 
-            if (strict_transition && current_state) {
-                bool allowed = false;
-                for (const auto &transition : current_state->GetTransitions()) {
-                    if (transition.target_state == id &&
-                            (!transition.condition || transition.condition(owner))) {
-                        allowed = true;
-                        break;
-                    }
-                }
-                if (!allowed)
-                    return;
-            }
-
             if (current_state) {
                 current_state->OnExit(owner);
                 history.push_back(current_state->Id());
@@ -68,12 +57,6 @@ class StateMachine {
             if (!current_state)
                 return;
 
-            for (const auto &transition : current_state->GetTransitions())
-                if (auto_transition && transition.condition(owner)) {
-                    ChangeState(transition.target_state);
-                    return;
-                }
-
             current_state->OnUpdate(owner);
         }
 
@@ -91,32 +74,18 @@ class StateMachine {
         }
 
         const std::string GetCurrentStateId() const {
-            static const std::string nullState = "null";
+            static const std::string nullState = "nullstate";
             return current_state ? current_state->Id() : nullState;
         }
 
-        void SetStrictTransitions(bool enabled) {
-            this->strict_transition = enabled;
-        }
-
-        bool GetStrictTransitions() const {
-            return strict_transition;
-        }
-
-        void SetAutoTransitions(bool enabled) {
-            this->auto_transition = enabled;
-        }
-
-        bool GetAutoTransitions() const {
-            return auto_transition;
+        T &GetOwner() {
+            return owner;
         }
 
     private:
         T &owner;
         const StateFactory<T> &factory;
         std::shared_ptr<State<T>> current_state;
-        bool strict_transition = false;
-        bool auto_transition = false;
         std::vector<std::string> history;
 };
 

include/state_system.hpp

@@ -1,6 +1,7 @@
 #ifndef STATE_SYSTEM_HPP
 #define STATE_SYSTEM_HPP
 
+#include "state.hpp"
 #include "state_machine.hpp"
 #include "state-machine_pool.hpp"
 
@@ -16,11 +17,6 @@ class StateSystem {
             GetPool<T>().UnregisterEntity(id);
         }
 
-        template <typename T>
-        void UpdateAll() {
-            GetPool<T>().UpdateAll();
-        }
-
         template <typename T>
         void ChangeState(const std::string &id, const std::string &stateId) {
             GetPool<T>().ChangeState(id, stateId);
@@ -37,6 +33,16 @@ class StateSystem {
                 GetPool<T>().RegisterState(id, std::move(state));
         }
 
+        template <typename T>
+        void AddTransition(Transition<T> &transition) {
+            GetPool<T>().AddTransition(transition);
+        }
+
+        template <typename T>
+        void UpdateAll() {
+            GetPool<T>().UpdateAll();
+        }
+
         template <typename T>
         json Serialize() const {
             StateMachinePool<T> &pool = GetPool<T>();