Editor.h

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// File: Editor.h
// Description: The system manager, handles all systems in the engine
// Author(s): Marcelo Escamilla, Bryley Elder (marcelo.escamilla@digipen.edu), (bryley.elder@digipen.edu)
// 2025 / 10 / 03
// (C) Digipen 2025
//   ____   __                  __  __
// /\__  _\/\ \                /\ \/\ \
// \/_/\ \/\ \ \___      __    \ \ \_\ \    ___   __  __    ____     __
//    \ \ \ \ \  _ `\  /'__`\   \ \  _  \  / __`\/\ \/\ \  /',__\  /'__`\
//     \ \ \ \ \ \ \ \/\  __/    \ \ \ \ \/\ \L\ \ \ \_\ \/\__, `\/\  __/
//      \ \_\ \ \_\ \_\ \____\    \ \_\ \_\ \____/\ \____/\/\____/\ \____\
//       \/_/  \/_/\/_/\/____/     \/_/\/_/\/___/  \/___/  \/___/  \/____/
#pragma once
 
#include "System/opengl.h"
 
// NOTE: Some of these includes are unused, so that you can include editor.h for all the ImGui things
#define IMGUI_DEFINE_MATH_OPERATORS
#include <filesystem>
 
#include "../Submodules/imgui/imgui.h"
#include "../Submodules/imgui/backends/imgui_impl_opengl3.h"
#include "../Submodules/imgui/backends/imgui_impl_glfw.h"
#include "../Submodules/ImGuizmo/src/ImGuizmo.h"
#include "misc/cpp/imgui_stdlib.h"
#include "Audio/AudioObject.h"
#include "Framework/Factory.h"
 
#ifndef EDITOR_H
#define EDITOR_H
#endif
 
#ifndef NDEBUG
#define START_WITH_IMGUI true
#else
#define START_WITH_IMGUI false
#endif
 
class ParticleEmitter;
 
namespace gfx
{
class Texture;
class Mesh;
}
 
namespace sys
{
class Editor : public System
{
public:
    auto getDefaultFont() -> ImFont*
    {
        return defaultFont;
    }
 
#pragma region static_functions

    static auto getEnum() -> Type
    {
        return Type::Editor;
    }
    
    static const ImVec2 SmallButtonSize;
    
    static const float IndentWidth;
 
#pragma endregion
 
    Editor();
    ~Editor() override;
    Editor(const Editor& other) = default;
    Editor(Editor&& other) noexcept;
    auto operator=(const Editor& other) -> Editor&;
 
    auto operator=(Editor&& other) noexcept -> Editor& = default;
 
 
#pragma region overridden_functions
 
    auto clone() const -> std::unique_ptr<GameObject> override
    {
        return std::make_unique<Editor>(*this);
    }
 
    auto onUpdate(float dt) -> void override;
 
    auto endWindow() -> void override
    {
    }; // for debug ImGUI
 
    auto onRender() -> void override;
    auto load(const Stream& stream) -> void override;
    auto save(Stream& stream) const -> void override;
 
#pragma endregion
 
#pragma region Editor_Functions
 
    auto PreRender() -> void;
    auto PostRender() -> void;
 
    auto shouldShowGui() const -> bool
    {
        return showImGui;
    }
 

    auto drawSystemMenu() -> void;
 
 
    // Scene Menu Things

    auto drawSceneMenu() -> void;
 
    auto EntityComponentsEditor() const -> void;

    auto drawEntitiesCompact() -> bool;

    auto EmitterEditor() const -> void;
 

    static auto showTexturePickerMenu() -> gfx::Texture*;

    static auto showMeshPickerMenu() -> gfx::Mesh*;

    template <typename T, int instance = 0>
    static auto showMakeFromFileMenu(const std::filesystem::path& directory) -> std::unique_ptr<T>;
 

    static auto displayTexture(const gfx::Texture* texture) -> void;

    auto receiveShowGUIKeyPressed(const Message* message) -> Message;

    auto select(Entity* selected) -> void;

    auto isSelected(Entity* entity) -> bool;

    auto getSelectedEntity() -> Entity*;

    auto deselect(Entity* entity) -> void;

    auto isPassingFilter(Entity* entity) -> bool;
 
    // Helper function to toggle the guizmos baseed on key input. W for translate, E for scale, R for rotate. 
    // Called in the Editor's sceneViewport function
    auto toggleGuizmos() -> void;
 
    [[nodiscard]] auto getSliderRatio() const -> float;

    auto select(ParticleEmitter* selected) -> void;
 

    auto isSelected(ParticleEmitter* emitter) -> bool;

    auto deselect(ParticleEmitter* toDeselect) -> void;
 
    auto getSceneViewPortMousePosition() -> Vector4D&;
 
#pragma endregion
 
private:
#pragma region member_variables
    ImFont* defaultFont;
    float sliderRatio = 0.4f;

    ImGuiTextFilter entityFilter;
    Entity* selectedEntity = nullptr;
    bool compactEntityView = false;
 

    bool showImGui{START_WITH_IMGUI};

    Vector4D editorMousePos = {0.f, 0.f, 0.f, 1.f};
 

    ParticleEmitter* selectedEmitter = nullptr;
#pragma endregion
 
#pragma region helper_functions
 
    auto SceneViewPort() -> void;

    static void drawEditorTopBar();

    void calculateViewportCoords(float width, float height);
 
#pragma endregion
    
#pragma region messaging_functions
    
    auto linkMessages() -> void;
    auto deleteSelectedEntity(const Message* message) -> Message;
    
#pragma endregion
    
#pragma region static_variables
 
#pragma endregion
    
};
 
template <typename T, int instance>
auto Editor::showMakeFromFileMenu(const std::filesystem::path& directory) -> std::unique_ptr<T>
{
    // I want cpp to make each call of this function different
    namespace fs = std::filesystem;
    // Make the button
    // Drop Down list for components to add
    static auto index = 0;
    static std::vector<std::string> itemNames;
    itemNames.clear();
    for (auto& entry : fs::directory_iterator("Data" / directory))
    {
        if (entry.path().extension() == ".json")
        {
            itemNames.push_back(entry.path().stem().string());
        }
    }
 
    std::vector<const char*> items;
    for (auto& name : itemNames)
    {
        items.push_back(name.c_str());
    }
 
    ImGui::Text("Select %s :", directory.string().c_str());
    ImGui::SetNextItemWidth(150.0f); // width in pixels
    ImGui::Combo("##Items",
                 &index,
                 items.data(),
                 static_cast<int>(items.size())
            );
    ImGui::SameLine();
    if (ImGui::Button("Add"))
    {
        // if we click the button, then we return the object
        const auto& selected = itemNames[index];
        return th::Factory::make<T>((directory / selected).string());
    }
    return nullptr;
}
} // namespace sys
 
 
#undef START_WITH_IMGUI