XCEngine/new_editor/app/Features/Scene/SceneViewportToolOverlay.h

#pragma once

#include "Scene/SceneToolState.h"
#include "Host/HostFwd.h"

#include <XCEngine/UI/DrawData.h>
#include <XCEngine/UI/Types.h>

#include <array>
#include <filesystem>
#include <cstddef>

namespace XCEngine::UI::Editor::App {

inline constexpr std::size_t kSceneViewportToolOverlayInvalidIndex =
    static_cast<std::size_t>(-1);

struct SceneViewportToolOverlayButtonFrame {
    SceneToolMode mode = SceneToolMode::View;
    ::XCEngine::UI::UIRect rect = {};
    ::XCEngine::UI::UITextureHandle texture = {};
    const char* label = "";
    bool active = false;
    bool hovered = false;
    bool pressed = false;
};

struct SceneViewportToolOverlayFrame {
    bool visible = false;
    ::XCEngine::UI::UIRect clipRect = {};
    ::XCEngine::UI::UIRect panelRect = {};
    std::array<SceneViewportToolOverlayButtonFrame, 5> buttons = {};
};

class SceneViewportToolOverlay {
public:
    bool Initialize(
        const std::filesystem::path& repoRoot,
        Host::TextureHost& renderer);
    void Shutdown(Host::TextureHost& renderer);
    void ResetFrame();

    void BuildFrame(
        const ::XCEngine::UI::UIRect& viewportRect,
        SceneToolMode activeMode,
        std::size_t hoveredIndex,
        std::size_t pressedIndex);

    std::size_t HitTest(const ::XCEngine::UI::UIPoint& point) const;
    bool Contains(const ::XCEngine::UI::UIPoint& point) const;

    const SceneViewportToolOverlayFrame& GetFrame() const;

private:
    struct ToolTextureSet {
        SceneToolMode mode = SceneToolMode::View;
        const char* label = "";
        ::XCEngine::UI::UITextureHandle inactiveTexture = {};
        ::XCEngine::UI::UITextureHandle activeTexture = {};
    };

    std::array<ToolTextureSet, 5> m_toolTextures = {};
    SceneViewportToolOverlayFrame m_frame = {};
};

void AppendSceneViewportToolOverlay(
    ::XCEngine::UI::UIDrawList& drawList,
    const SceneViewportToolOverlayFrame& frame);

} // namespace XCEngine::UI::Editor::App