GECS.h

#pragma once
 
#include <iostream>
#include <vector>
#include <memory>
#include <algorithm>
#include <bitset>
#include <array>
#include <unordered_map>
 
#include <SDL2/SDL.h>
#include "../../Renderers/PlaneRenderers/PlaneModelRenderer/PlaneModelRenderer.h"
#include "../../Renderers/LineRenderer/LineRenderer.h"
#include "../../Renderers/PlaneRenderers/PlaneColorRenderer/PlaneColorRenderer.h"
#include "../../Renderers/PlaneRenderers/LightRenderer/LightRenderer.h"
#include "../../Camera2.5D/CameraManager.h"
#include "../../Window/Window.h"
#include <optional>
 
#define CULLING_OFFSET 100
 
class BaseComponent;
class Entity;
class EmptyEntity;
class NodeEntity;
class LinkEntity;
 
class Manager;
class Window;
struct Cell;
 
using ComponentID = std::size_t;
using Group = std::size_t;
 
using layer = std::size_t;
 
namespace Layer {
    enum layerIndexes : std::size_t
    {
        action,
        menubackground
    };
}
 
const std::unordered_map<layer, float> layerNames = {
        {Layer::action, 0.0f},
        {Layer::menubackground, -100.0f}
 
};
 
inline float getLayerDepth(layer mLayer) {
    return layerNames.at(mLayer);
}
 
 
inline ComponentID getNewComponentTypeID()
{
    static ComponentID lastID = 0u;
    return lastID++;
}
 
inline ComponentID getNewNodeComponentTypeID()
{
    static ComponentID lastID_nodeC = 0u;
    return lastID_nodeC++;
}
 
inline ComponentID getNewLinkComponentTypeID()
{
    static ComponentID lastID_linkC = 0u;
    return lastID_linkC++;
}
 
 
template <typename T> inline ComponentID GetComponentTypeID() noexcept
{
    static ComponentID typeID = getNewComponentTypeID(); // typeID is unique for each function type T and only initialized once.
    return typeID;
}
 
template <typename T> inline ComponentID GetNodeComponentTypeID() noexcept
{
    static ComponentID typeID = getNewNodeComponentTypeID(); // typeID is unique for each function type T and only initialized once.
    return typeID;
}
 
template <typename T> inline ComponentID GetLinkComponentTypeID() noexcept
{
    static ComponentID typeID = getNewLinkComponentTypeID(); // typeID is unique for each function type T and only initialized once.
    return typeID;
}
 
constexpr std::size_t maxComponents = 16;
constexpr std::size_t maxGroups = 16;
 
using ComponentBitSet = std::bitset<maxComponents>;
using GroupBitSet = std::bitset<maxGroups>;
 
using ComponentArray = std::array<BaseComponent*, maxComponents>;
 
class BaseComponent
{
public:
 
    ComponentID id = 0u;
 
    virtual void init() {}
    virtual void update(float deltaTime) {}
    virtual void draw(size_t e_index, PlaneModelRenderer& batch, TazGraphEngine::Window& window) {}
    virtual void draw(size_t e_index, LineRenderer& batch, TazGraphEngine::Window& window) {}
    virtual void draw(size_t e_index, PlaneColorRenderer& batch, TazGraphEngine::Window& window) {}
    virtual void draw(size_t e_index, LightRenderer& batch, TazGraphEngine::Window& window) {}
 
    virtual std::string GetComponentName() { return ""; };
 
    virtual void showGUI() {
        ImGui::Text("MyComponent Properties:");
    };
 
    virtual ~BaseComponent() {}
};
 
class Component : public BaseComponent {
public:
    Entity* entity = nullptr;
};
 
class NodeComponent : public BaseComponent {
public:
    NodeEntity* entity = nullptr;
};
 
class LinkComponent : public BaseComponent {
public:
    LinkEntity* entity = nullptr;
};
 
 
class Entity
{
private:
    unsigned int id = 0;
 
    bool active = true; // false if about to delete
    bool hidden = false; // true if not do updates
    ComponentArray componentArray = {};//create 2 arrays, this is for the fast access
 
    ComponentBitSet componentBitSet;
    GroupBitSet groupBitSet;
 
protected:
    std::optional<ComponentArray> nodeComponentArray;
    std::optional<ComponentBitSet> nodeComponentBitSet;
 
    Manager& manager;
public:
    std::unordered_map<std::string,EmptyEntity*> children;
 
    void setId(unsigned int m_id) { id = m_id; }
    unsigned int getId() { return id; }
 
    void hide() {
        hidden = true;
    }
 
    void reveal() {
        hidden = false;
    }
 
    bool isHidden() {
        return hidden;
    }
 
    std::vector<std::unique_ptr<BaseComponent>> components; //create 2 arrays, this is for the concurrent access
    
    Entity(Manager& mManager) : manager(mManager) {}
    virtual ~Entity() {}
 
    virtual void update(float deltaTime)
    {
        
        for (auto& c : components) {
            c->update(deltaTime); // start from which was added first
        }
    }
 
    virtual void cellUpdate() {};
 
    virtual Cell* getOwnerCell() const { return nullptr; };
 
    void draw(size_t e_index, PlaneModelRenderer& batch, TazGraphEngine::Window& window)
    {
        for (auto& c : components) { 
            c->draw(e_index, batch, window);
        }
    }
    void draw(size_t e_index, LineRenderer& batch, TazGraphEngine::Window& window)
    {
        for (auto& c : components) {
            c->draw(e_index, batch, window);
        }
    }
    void draw(size_t e_index, PlaneColorRenderer& batch, TazGraphEngine::Window& window)
    {
        for (auto& c : components) {
            c->draw(e_index, batch, window);
        }
    }
    void draw(size_t e_index, LightRenderer& batch, TazGraphEngine::Window& window)
    {
        for (auto& c : components) {
            c->draw(e_index, batch, window);
        }
    }
    bool isActive() { return active; }
    virtual void destroy() { active = false;
    } // destroy happens relative to the group referencing
 
    bool hasGroup(Group mGroup)
    {
        return groupBitSet[mGroup];
    }
 
    virtual void addGroup(Group mGroup);
    void removeGroup(Group mGroup);
 
    template <typename T> bool hasComponent() const
    {
        if constexpr (std::is_base_of_v<LinkComponent, T>) {
            return this && componentBitSet[GetLinkComponentTypeID<T>()];
        }
        else if constexpr (std::is_base_of_v<NodeComponent, T>) {
            return this && nodeComponentBitSet.has_value() && (*nodeComponentBitSet)[GetNodeComponentTypeID<T>()];
        }
        return this && componentBitSet[GetComponentTypeID<T>()];
    }
    template <typename T, typename... TArgs>
    T& addComponent(TArgs&&... mArgs)
    {
        T* c(new T(std::forward<TArgs>(mArgs)...));
        if constexpr (std::is_base_of_v<LinkComponent, T>) {
            std::unique_ptr<LinkComponent> uPtr{ c };
            components.emplace_back(std::move(uPtr));
 
            setComponentEntity(c);
            componentArray[GetLinkComponentTypeID<T>()] = c;
            componentBitSet[GetLinkComponentTypeID<T>()] = true;
 
            c->id = GetLinkComponentTypeID<T>();
 
            c->init();
            return *c;
        }
        else if constexpr (std::is_base_of_v<NodeComponent, T>) {
            std::unique_ptr<NodeComponent> uPtr{ c };
            components.emplace_back(std::move(uPtr));
 
            setComponentEntity(c);
            (*nodeComponentArray)[GetNodeComponentTypeID<T>()] = c;
            (*nodeComponentBitSet)[GetNodeComponentTypeID<T>()] = true;
 
            c->id = GetNodeComponentTypeID<T>();
 
            c->init();
            return *c;
        }
        else {
            std::unique_ptr<Component> uPtr{ c };
            components.emplace_back(std::move(uPtr));
            
            setComponentEntity(c);
            componentArray[GetComponentTypeID<T>()] = c;
            componentBitSet[GetComponentTypeID<T>()] = true;
 
            c->id = GetComponentTypeID<T>();
 
            c->init();
            return *c;
        }
        
        
    }
 
    template <typename T>
    void removeComponent()
    {
        if constexpr (std::is_base_of_v<LinkComponent, T>)
        {
            size_t id = GetLinkComponentTypeID<T>();
            auto it = std::remove_if(components.begin(), components.end(),
                [id](const std::unique_ptr<BaseComponent>& comp) {
                    return typeid(*comp).hash_code() == typeid(T).hash_code();
                });
 
            if (it != components.end())
            {
                components.erase(it, components.end());
                componentArray[id] = nullptr;
                componentBitSet[id] = false;
            }
        }
        else if constexpr (std::is_base_of_v<NodeComponent, T>)
        {
            size_t id = GetNodeComponentTypeID<T>();
            auto it = std::remove_if(components.begin(), components.end(),
                [id](const std::unique_ptr<BaseComponent>& comp) {
                    return typeid(*comp).hash_code() == typeid(T).hash_code();
                });
 
            if (it != components.end())
            {
                components.erase(it, components.end());
                (*nodeComponentArray)[id] = nullptr;
                (*nodeComponentBitSet)[id] = false;
            }
        }
        else
        {
            size_t id = GetComponentTypeID<T>();
            auto it = std::remove_if(components.begin(), components.end(),
                [id](const std::unique_ptr<BaseComponent>& comp) {
                    return typeid(*comp).hash_code() == typeid(T).hash_code();
                });
 
            if (it != components.end())
            {
                components.erase(it, components.end());
                componentArray[id] = nullptr;
                componentBitSet[id] = false;
            }
        }
    }
 
    virtual void setComponentEntity(Component* c) {
 
    }
    virtual void setComponentEntity(NodeComponent* c) {
 
    }
    virtual void setComponentEntity(LinkComponent* c) {
 
    }
 
    template<typename T> T& GetComponent() const
    {
        if constexpr (std::is_base_of_v<LinkComponent, T>) {
            auto ptr(componentArray[GetLinkComponentTypeID<T>()]);
            return *static_cast<T*>(ptr);
        }
        else if constexpr (std::is_base_of_v<NodeComponent, T>) {
            auto ptr((*nodeComponentArray)[GetNodeComponentTypeID<T>()]);
            return *static_cast<T*>(ptr);
        }
        else {
            auto ptr(componentArray[GetComponentTypeID<T>()]);
            return *static_cast<T*>(ptr);
        }
    }
 
    bool hasComponentByName(const std::string& componentName) {
        for (auto& component : components) {
            if (component &&
                component->GetComponentName() == componentName) {
                return true;
            }
        }
        return false;
    }
 
    
 
    // for when wanting to add new entities from components
    Manager* getManager() {
        return &manager;
    }
 
    virtual void addMessage(std::string mMessage) {}
 
 
    virtual Entity* getParentEntity() {
        return nullptr;
    }
 
    virtual void setParentEntity(Entity* pEntity) {}
 
    virtual void imgui_print() {}
 
    virtual void imgui_display() {}
 
    virtual void removeEntity() {}
};