XCEngine/new_editor/app/Application.cpp

#include "Application.h"

#include "Shell/ProductShellAsset.h"

#include <XCEditor/Foundation/UIEditorTheme.h>

#include <XCEngine/Input/InputTypes.h>
#include <XCEngine/UI/DrawData.h>

#include <algorithm>
#include <cctype>
#include <cstdlib>
#include <string>

#ifndef XCUIEDITOR_REPO_ROOT
#define XCUIEDITOR_REPO_ROOT "."
#endif

namespace XCEngine::UI::Editor {

namespace {

using ::XCEngine::Input::KeyCode;
using ::XCEngine::UI::UIColor;
using ::XCEngine::UI::UIDrawData;
using ::XCEngine::UI::UIDrawList;
using ::XCEngine::UI::UIInputEvent;
using ::XCEngine::UI::UIInputEventType;
using ::XCEngine::UI::UIPoint;
using ::XCEngine::UI::UIPointerButton;
using ::XCEngine::UI::UIRect;
using App::BuildProductShellAsset;
using App::BuildProductShellInteractionDefinition;

constexpr const wchar_t* kWindowClassName = L"XCEditorShellHost";
constexpr const wchar_t* kWindowTitle = L"Main Scene * - Main.xx - XCEngine Editor";

Application* GetApplicationFromWindow(HWND hwnd) {
    return reinterpret_cast<Application*>(GetWindowLongPtrW(hwnd, GWLP_USERDATA));
}

std::string TruncateText(const std::string& text, std::size_t maxLength) {
    if (text.size() <= maxLength) {
        return text;
    }

    if (maxLength <= 3u) {
        return text.substr(0u, maxLength);
    }

    return text.substr(0u, maxLength - 3u) + "...";
}

bool IsAutoCaptureOnStartupEnabled() {
    const char* value = std::getenv("XCUI_AUTO_CAPTURE_ON_STARTUP");
    if (value == nullptr || value[0] == '\0') {
        return false;
    }

    std::string normalized = value;
    std::transform(
        normalized.begin(),
        normalized.end(),
        normalized.begin(),
        [](unsigned char character) {
            return static_cast<char>(std::tolower(character));
        });
    return normalized != "0" &&
        normalized != "false" &&
        normalized != "off" &&
        normalized != "no";
}

std::int32_t MapVirtualKeyToUIKeyCode(WPARAM wParam) {
    switch (wParam) {
    case 'A': return static_cast<std::int32_t>(KeyCode::A);
    case 'B': return static_cast<std::int32_t>(KeyCode::B);
    case 'C': return static_cast<std::int32_t>(KeyCode::C);
    case 'D': return static_cast<std::int32_t>(KeyCode::D);
    case 'E': return static_cast<std::int32_t>(KeyCode::E);
    case 'F': return static_cast<std::int32_t>(KeyCode::F);
    case 'G': return static_cast<std::int32_t>(KeyCode::G);
    case 'H': return static_cast<std::int32_t>(KeyCode::H);
    case 'I': return static_cast<std::int32_t>(KeyCode::I);
    case 'J': return static_cast<std::int32_t>(KeyCode::J);
    case 'K': return static_cast<std::int32_t>(KeyCode::K);
    case 'L': return static_cast<std::int32_t>(KeyCode::L);
    case 'M': return static_cast<std::int32_t>(KeyCode::M);
    case 'N': return static_cast<std::int32_t>(KeyCode::N);
    case 'O': return static_cast<std::int32_t>(KeyCode::O);
    case 'P': return static_cast<std::int32_t>(KeyCode::P);
    case 'Q': return static_cast<std::int32_t>(KeyCode::Q);
    case 'R': return static_cast<std::int32_t>(KeyCode::R);
    case 'S': return static_cast<std::int32_t>(KeyCode::S);
    case 'T': return static_cast<std::int32_t>(KeyCode::T);
    case 'U': return static_cast<std::int32_t>(KeyCode::U);
    case 'V': return static_cast<std::int32_t>(KeyCode::V);
    case 'W': return static_cast<std::int32_t>(KeyCode::W);
    case 'X': return static_cast<std::int32_t>(KeyCode::X);
    case 'Y': return static_cast<std::int32_t>(KeyCode::Y);
    case 'Z': return static_cast<std::int32_t>(KeyCode::Z);
    case '0': return static_cast<std::int32_t>(KeyCode::Zero);
    case '1': return static_cast<std::int32_t>(KeyCode::One);
    case '2': return static_cast<std::int32_t>(KeyCode::Two);
    case '3': return static_cast<std::int32_t>(KeyCode::Three);
    case '4': return static_cast<std::int32_t>(KeyCode::Four);
    case '5': return static_cast<std::int32_t>(KeyCode::Five);
    case '6': return static_cast<std::int32_t>(KeyCode::Six);
    case '7': return static_cast<std::int32_t>(KeyCode::Seven);
    case '8': return static_cast<std::int32_t>(KeyCode::Eight);
    case '9': return static_cast<std::int32_t>(KeyCode::Nine);
    case VK_SPACE: return static_cast<std::int32_t>(KeyCode::Space);
    case VK_TAB: return static_cast<std::int32_t>(KeyCode::Tab);
    case VK_RETURN: return static_cast<std::int32_t>(KeyCode::Enter);
    case VK_ESCAPE: return static_cast<std::int32_t>(KeyCode::Escape);
    case VK_SHIFT: return static_cast<std::int32_t>(KeyCode::LeftShift);
    case VK_CONTROL: return static_cast<std::int32_t>(KeyCode::LeftCtrl);
    case VK_MENU: return static_cast<std::int32_t>(KeyCode::LeftAlt);
    case VK_UP: return static_cast<std::int32_t>(KeyCode::Up);
    case VK_DOWN: return static_cast<std::int32_t>(KeyCode::Down);
    case VK_LEFT: return static_cast<std::int32_t>(KeyCode::Left);
    case VK_RIGHT: return static_cast<std::int32_t>(KeyCode::Right);
    case VK_HOME: return static_cast<std::int32_t>(KeyCode::Home);
    case VK_END: return static_cast<std::int32_t>(KeyCode::End);
    case VK_PRIOR: return static_cast<std::int32_t>(KeyCode::PageUp);
    case VK_NEXT: return static_cast<std::int32_t>(KeyCode::PageDown);
    case VK_DELETE: return static_cast<std::int32_t>(KeyCode::Delete);
    case VK_BACK: return static_cast<std::int32_t>(KeyCode::Backspace);
    case VK_F1: return static_cast<std::int32_t>(KeyCode::F1);
    case VK_F2: return static_cast<std::int32_t>(KeyCode::F2);
    case VK_F3: return static_cast<std::int32_t>(KeyCode::F3);
    case VK_F4: return static_cast<std::int32_t>(KeyCode::F4);
    case VK_F5: return static_cast<std::int32_t>(KeyCode::F5);
    case VK_F6: return static_cast<std::int32_t>(KeyCode::F6);
    case VK_F7: return static_cast<std::int32_t>(KeyCode::F7);
    case VK_F8: return static_cast<std::int32_t>(KeyCode::F8);
    case VK_F9: return static_cast<std::int32_t>(KeyCode::F9);
    case VK_F10: return static_cast<std::int32_t>(KeyCode::F10);
    case VK_F11: return static_cast<std::int32_t>(KeyCode::F11);
    case VK_F12: return static_cast<std::int32_t>(KeyCode::F12);
    default: return static_cast<std::int32_t>(KeyCode::None);
    }
}

bool IsRepeatKeyMessage(LPARAM lParam) {
    return (static_cast<unsigned long>(lParam) & (1ul << 30)) != 0ul;
}

} // namespace

int Application::Run(HINSTANCE hInstance, int nCmdShow) {
    if (!Initialize(hInstance, nCmdShow)) {
        Shutdown();
        return 1;
    }

    MSG message = {};
    while (message.message != WM_QUIT) {
        if (PeekMessageW(&message, nullptr, 0U, 0U, PM_REMOVE)) {
            TranslateMessage(&message);
            DispatchMessageW(&message);
            continue;
        }

        RenderFrame();
        Sleep(8);
    }

    Shutdown();
    return static_cast<int>(message.wParam);
}

bool Application::Initialize(HINSTANCE hInstance, int nCmdShow) {
    m_hInstance = hInstance;
    m_shellAsset = BuildProductShellAsset(ResolveRepoRootPath());
    m_shellValidation = ValidateEditorShellAsset(m_shellAsset);
    m_validationMessage = m_shellValidation.message;
    if (!m_shellValidation.IsValid()) {
        return false;
    }

    m_workspaceController = UIEditorWorkspaceController(
        m_shellAsset.panelRegistry,
        m_shellAsset.workspace,
        m_shellAsset.workspaceSession);
    m_shortcutManager = BuildEditorShellShortcutManager(m_shellAsset);
    m_shortcutManager.SetHostCommandHandler(this);
    m_shellServices = {};
    m_shellServices.commandDispatcher = &m_shortcutManager.GetCommandDispatcher();
    m_shellServices.shortcutManager = &m_shortcutManager;
    m_lastStatus = "Ready";
    m_lastMessage = "Old editor shell baseline loaded.";

    WNDCLASSEXW windowClass = {};
    windowClass.cbSize = sizeof(windowClass);
    windowClass.style = CS_HREDRAW | CS_VREDRAW;
    windowClass.lpfnWndProc = &Application::WndProc;
    windowClass.hInstance = hInstance;
    windowClass.hCursor = LoadCursorW(nullptr, IDC_ARROW);
    windowClass.lpszClassName = kWindowClassName;
    m_windowClassAtom = RegisterClassExW(&windowClass);
    if (m_windowClassAtom == 0) {
        return false;
    }

    m_hwnd = CreateWindowExW(
        0,
        kWindowClassName,
        kWindowTitle,
        WS_OVERLAPPEDWINDOW | WS_VISIBLE,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        1540,
        940,
        nullptr,
        nullptr,
        hInstance,
        this);
    if (m_hwnd == nullptr) {
        return false;
    }

    ShowWindow(m_hwnd, nCmdShow);
    UpdateWindow(m_hwnd);

    if (!m_renderer.Initialize(m_hwnd)) {
        return false;
    }

    m_autoScreenshot.Initialize(m_shellAsset.captureRootPath);
    if (IsAutoCaptureOnStartupEnabled()) {
        m_autoScreenshot.RequestCapture("startup");
        m_lastStatus = "Capture";
        m_lastMessage = "Startup capture requested.";
    }
    return true;
}

void Application::Shutdown() {
    if (GetCapture() == m_hwnd) {
        ReleaseCapture();
    }

    m_autoScreenshot.Shutdown();
    m_renderer.Shutdown();

    if (m_hwnd != nullptr && IsWindow(m_hwnd)) {
        DestroyWindow(m_hwnd);
    }
    m_hwnd = nullptr;

    if (m_windowClassAtom != 0 && m_hInstance != nullptr) {
        UnregisterClassW(kWindowClassName, m_hInstance);
        m_windowClassAtom = 0;
    }
}

void Application::RenderFrame() {
    if (m_hwnd == nullptr) {
        return;
    }

    RECT clientRect = {};
    GetClientRect(m_hwnd, &clientRect);
    const float width = static_cast<float>((std::max)(clientRect.right - clientRect.left, 1L));
    const float height = static_cast<float>((std::max)(clientRect.bottom - clientRect.top, 1L));

    UIDrawData drawData = {};
    UIDrawList& drawList = drawData.EmplaceDrawList("XCEditorShell");
    drawList.AddFilledRect(
        UIRect(0.0f, 0.0f, width, height),
        UIColor(0.10f, 0.10f, 0.10f, 1.0f));

    if (m_shellValidation.IsValid()) {
        const auto& metrics = ResolveUIEditorShellInteractionMetrics();
        const auto& palette = ResolveUIEditorShellInteractionPalette();
        const UIEditorShellInteractionDefinition definition = BuildShellDefinition();
        std::vector<UIInputEvent> frameEvents = std::move(m_pendingInputEvents);
        m_pendingInputEvents.clear();

        m_shellFrame = UpdateUIEditorShellInteraction(
            m_shellInteractionState,
            m_workspaceController,
            UIRect(0.0f, 0.0f, width, height),
            definition,
            frameEvents,
            m_shellServices,
            metrics);
        ApplyHostCaptureRequests(m_shellFrame.result);
        UpdateLastStatus(m_shellFrame.result);
        AppendUIEditorShellInteraction(
            drawList,
            m_shellFrame,
            m_shellInteractionState,
            palette,
            metrics);
    } else {
        drawList.AddText(
            UIPoint(28.0f, 28.0f),
            "Editor shell asset invalid.",
            UIColor(0.92f, 0.92f, 0.92f, 1.0f),
            16.0f);
        drawList.AddText(
            UIPoint(28.0f, 54.0f),
            m_validationMessage.empty() ? std::string("Unknown validation error.") : m_validationMessage,
            UIColor(0.72f, 0.72f, 0.72f, 1.0f),
            12.0f);
    }

    const bool framePresented = m_renderer.Render(drawData);
    m_autoScreenshot.CaptureIfRequested(
        m_renderer,
        drawData,
        static_cast<unsigned int>(width),
        static_cast<unsigned int>(height),
        framePresented);
}

void Application::OnResize(UINT width, UINT height) {
    if (width == 0 || height == 0) {
        return;
    }

    m_renderer.Resize(width, height);
}

void Application::ApplyHostCaptureRequests(const UIEditorShellInteractionResult& result) {
    if (result.requestPointerCapture && GetCapture() != m_hwnd) {
        SetCapture(m_hwnd);
    }
    if (result.releasePointerCapture && GetCapture() == m_hwnd) {
        ReleaseCapture();
    }
}

bool Application::HasInteractiveCaptureState() const {
    if (m_shellInteractionState.workspaceInteractionState.dockHostInteractionState.splitterDragState.active) {
        return true;
    }

    for (const auto& panelState : m_shellInteractionState.workspaceInteractionState.composeState.panelStates) {
        if (panelState.viewportShellState.inputBridgeState.captured) {
            return true;
        }
    }

    return false;
}

UIEditorShellInteractionDefinition Application::BuildShellDefinition() const {
    std::string statusText = m_lastStatus;
    if (!m_lastMessage.empty()) {
        statusText += statusText.empty() ? m_lastMessage : ": " + m_lastMessage;
    }

    std::string captureText = {};
    if (m_autoScreenshot.HasPendingCapture()) {
        captureText = "Shot pending...";
    } else if (!m_autoScreenshot.GetLastCaptureError().empty()) {
        captureText = TruncateText(m_autoScreenshot.GetLastCaptureError(), 38u);
    } else if (!m_autoScreenshot.GetLastCaptureSummary().empty()) {
        captureText = TruncateText(m_autoScreenshot.GetLastCaptureSummary(), 38u);
    }

    return BuildProductShellInteractionDefinition(
        m_shellAsset,
        m_workspaceController,
        statusText,
        captureText);
}

void Application::UpdateLastStatus(const UIEditorShellInteractionResult& result) {
    if (result.commandDispatched) {
        m_lastStatus = std::string(GetUIEditorCommandDispatchStatusName(result.commandDispatchResult.status));
        m_lastMessage = result.commandDispatchResult.message.empty()
            ? result.commandDispatchResult.displayName
            : result.commandDispatchResult.message;
        return;
    }

    if (result.workspaceResult.dockHostResult.layoutChanged) {
        m_lastStatus = "Layout";
        m_lastMessage = result.workspaceResult.dockHostResult.layoutResult.message;
        return;
    }

    if (result.workspaceResult.dockHostResult.commandExecuted) {
        m_lastStatus = "Workspace";
        m_lastMessage = result.workspaceResult.dockHostResult.commandResult.message;
        return;
    }

    if (!result.viewportPanelId.empty()) {
        m_lastStatus = result.viewportPanelId;
        if (result.viewportInputFrame.captureStarted) {
            m_lastMessage = "Viewport capture started.";
        } else if (result.viewportInputFrame.captureEnded) {
            m_lastMessage = "Viewport capture ended.";
        } else if (result.viewportInputFrame.focusGained) {
            m_lastMessage = "Viewport focused.";
        } else if (result.viewportInputFrame.focusLost) {
            m_lastMessage = "Viewport focus lost.";
        } else if (result.viewportInputFrame.pointerPressedInside) {
            m_lastMessage = "Viewport pointer down.";
        } else if (result.viewportInputFrame.pointerReleasedInside) {
            m_lastMessage = "Viewport pointer up.";
        } else if (result.viewportInputFrame.pointerMoved) {
            m_lastMessage = "Viewport pointer move.";
        } else if (result.viewportInputFrame.wheelDelta != 0.0f) {
            m_lastMessage = "Viewport wheel.";
        }
        return;
    }

    if (result.menuMutation.changed) {
        if (!result.itemId.empty() && !result.menuMutation.openedPopupId.empty()) {
            m_lastStatus = "Menu";
            m_lastMessage = result.itemId + " opened child popup.";
        } else if (!result.menuId.empty() && !result.menuMutation.openedPopupId.empty()) {
            m_lastStatus = "Menu";
            m_lastMessage = result.menuId + " opened.";
        } else {
            m_lastStatus = "Menu";
            m_lastMessage = "Popup chain dismissed.";
        }
    }
}

void Application::QueuePointerEvent(
    UIInputEventType type,
    UIPointerButton button,
    WPARAM wParam,
    LPARAM lParam) {
    UIInputEvent event = {};
    event.type = type;
    event.pointerButton = button;
    event.position = UIPoint(
        static_cast<float>(GET_X_LPARAM(lParam)),
        static_cast<float>(GET_Y_LPARAM(lParam)));
    event.modifiers = m_inputModifierTracker.BuildPointerModifiers(static_cast<std::size_t>(wParam));
    m_pendingInputEvents.push_back(event);
}

void Application::QueuePointerLeaveEvent() {
    UIInputEvent event = {};
    event.type = UIInputEventType::PointerLeave;
    if (m_hwnd != nullptr) {
        POINT clientPoint = {};
        GetCursorPos(&clientPoint);
        ScreenToClient(m_hwnd, &clientPoint);
        event.position = UIPoint(
            static_cast<float>(clientPoint.x),
            static_cast<float>(clientPoint.y));
    }
    m_pendingInputEvents.push_back(event);
}

void Application::QueuePointerWheelEvent(short wheelDelta, WPARAM wParam, LPARAM lParam) {
    if (m_hwnd == nullptr) {
        return;
    }

    POINT screenPoint = {
        GET_X_LPARAM(lParam),
        GET_Y_LPARAM(lParam)
    };
    ScreenToClient(m_hwnd, &screenPoint);

    UIInputEvent event = {};
    event.type = UIInputEventType::PointerWheel;
    event.position = UIPoint(
        static_cast<float>(screenPoint.x),
        static_cast<float>(screenPoint.y));
    event.wheelDelta = static_cast<float>(wheelDelta);
    event.modifiers = m_inputModifierTracker.BuildPointerModifiers(static_cast<std::size_t>(wParam));
    m_pendingInputEvents.push_back(event);
}

void Application::QueueKeyEvent(UIInputEventType type, WPARAM wParam, LPARAM lParam) {
    UIInputEvent event = {};
    event.type = type;
    event.keyCode = MapVirtualKeyToUIKeyCode(wParam);
    event.modifiers = m_inputModifierTracker.ApplyKeyMessage(type, wParam, lParam);
    event.repeat = IsRepeatKeyMessage(lParam);
    m_pendingInputEvents.push_back(event);
}

void Application::QueueCharacterEvent(WPARAM wParam, LPARAM) {
    UIInputEvent event = {};
    event.type = UIInputEventType::Character;
    event.character = static_cast<std::uint32_t>(wParam);
    event.modifiers = m_inputModifierTracker.GetCurrentModifiers();
    m_pendingInputEvents.push_back(event);
}

void Application::QueueWindowFocusEvent(UIInputEventType type) {
    UIInputEvent event = {};
    event.type = type;
    m_pendingInputEvents.push_back(event);
}

std::filesystem::path Application::ResolveRepoRootPath() {
    std::string root = XCUIEDITOR_REPO_ROOT;
    if (root.size() >= 2u && root.front() == '"' && root.back() == '"') {
        root = root.substr(1u, root.size() - 2u);
    }
    return std::filesystem::path(root).lexically_normal();
}

UIEditorHostCommandEvaluationResult Application::EvaluateHostCommand(
    std::string_view commandId) const {
    UIEditorHostCommandEvaluationResult result = {};
    if (commandId == "file.exit") {
        result.executable = true;
        result.message = "Exit command is ready.";
        return result;
    }

    if (commandId == "help.about") {
        result.executable = true;
        result.message = "About placeholder is ready.";
        return result;
    }

    if (commandId.rfind("file.", 0u) == 0u) {
        result.message = "Document command bridge is not attached yet.";
        return result;
    }
    if (commandId.rfind("edit.", 0u) == 0u) {
        result.message = "Edit route bridge is not attached yet.";
        return result;
    }
    if (commandId.rfind("assets.", 0u) == 0u) {
        result.message = "Asset pipeline bridge is not attached yet.";
        return result;
    }
    if (commandId.rfind("run.", 0u) == 0u) {
        result.message = "Runtime bridge is not attached yet.";
        return result;
    }
    if (commandId.rfind("scripts.", 0u) == 0u) {
        result.message = "Script pipeline bridge is not attached yet.";
        return result;
    }

    result.message = "Host command is not attached yet.";
    return result;
}

UIEditorHostCommandDispatchResult Application::DispatchHostCommand(
    std::string_view commandId) {
    UIEditorHostCommandDispatchResult result = {};
    if (commandId == "file.exit") {
        result.commandExecuted = true;
        result.message = "Exit requested.";
        if (m_hwnd != nullptr) {
            PostMessageW(m_hwnd, WM_CLOSE, 0, 0);
        }
        return result;
    }

    if (commandId == "help.about") {
        result.commandExecuted = true;
        result.message = "About dialog will be wired after modal layer lands.";
        m_lastStatus = "About";
        m_lastMessage = result.message;
        return result;
    }

    result.message = "Host command dispatch rejected.";
    return result;
}

LRESULT CALLBACK Application::WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) {
    if (message == WM_NCCREATE) {
        const auto* createStruct = reinterpret_cast<CREATESTRUCTW*>(lParam);
        auto* application = reinterpret_cast<Application*>(createStruct->lpCreateParams);
        SetWindowLongPtrW(hwnd, GWLP_USERDATA, reinterpret_cast<LONG_PTR>(application));
        return TRUE;
    }

    Application* application = GetApplicationFromWindow(hwnd);
    switch (message) {
    case WM_SIZE:
        if (application != nullptr && wParam != SIZE_MINIMIZED) {
            application->OnResize(static_cast<UINT>(LOWORD(lParam)), static_cast<UINT>(HIWORD(lParam)));
        }
        return 0;
    case WM_PAINT:
        if (application != nullptr) {
            PAINTSTRUCT paintStruct = {};
            BeginPaint(hwnd, &paintStruct);
            application->RenderFrame();
            EndPaint(hwnd, &paintStruct);
            return 0;
        }
        break;
    case WM_MOUSEMOVE:
        if (application != nullptr) {
            if (!application->m_trackingMouseLeave) {
                TRACKMOUSEEVENT trackMouseEvent = {};
                trackMouseEvent.cbSize = sizeof(trackMouseEvent);
                trackMouseEvent.dwFlags = TME_LEAVE;
                trackMouseEvent.hwndTrack = hwnd;
                if (TrackMouseEvent(&trackMouseEvent)) {
                    application->m_trackingMouseLeave = true;
                }
            }
            application->QueuePointerEvent(
                UIInputEventType::PointerMove,
                UIPointerButton::None,
                wParam,
                lParam);
            return 0;
        }
        break;
    case WM_MOUSELEAVE:
        if (application != nullptr) {
            application->m_trackingMouseLeave = false;
            application->QueuePointerLeaveEvent();
            return 0;
        }
        break;
    case WM_LBUTTONDOWN:
        if (application != nullptr) {
            SetFocus(hwnd);
            application->QueuePointerEvent(
                UIInputEventType::PointerButtonDown,
                UIPointerButton::Left,
                wParam,
                lParam);
            return 0;
        }
        break;
    case WM_LBUTTONUP:
        if (application != nullptr) {
            application->QueuePointerEvent(
                UIInputEventType::PointerButtonUp,
                UIPointerButton::Left,
                wParam,
                lParam);
            return 0;
        }
        break;
    case WM_MOUSEWHEEL:
        if (application != nullptr) {
            application->QueuePointerWheelEvent(GET_WHEEL_DELTA_WPARAM(wParam), wParam, lParam);
            return 0;
        }
        break;
    case WM_SETFOCUS:
        if (application != nullptr) {
            application->m_inputModifierTracker.SyncFromSystemState();
            application->QueueWindowFocusEvent(UIInputEventType::FocusGained);
            return 0;
        }
        break;
    case WM_KILLFOCUS:
        if (application != nullptr) {
            application->m_inputModifierTracker.Reset();
            application->QueueWindowFocusEvent(UIInputEventType::FocusLost);
            return 0;
        }
        break;
    case WM_CAPTURECHANGED:
        if (application != nullptr &&
            reinterpret_cast<HWND>(lParam) != hwnd &&
            application->HasInteractiveCaptureState()) {
            application->QueueWindowFocusEvent(UIInputEventType::FocusLost);
            return 0;
        }
        break;
    case WM_KEYDOWN:
    case WM_SYSKEYDOWN:
        if (application != nullptr) {
            if (wParam == VK_F12) {
                application->m_autoScreenshot.RequestCapture("manual_f12");
            }
            application->QueueKeyEvent(UIInputEventType::KeyDown, wParam, lParam);
            return 0;
        }
        break;
    case WM_KEYUP:
    case WM_SYSKEYUP:
        if (application != nullptr) {
            application->QueueKeyEvent(UIInputEventType::KeyUp, wParam, lParam);
            return 0;
        }
        break;
    case WM_CHAR:
        if (application != nullptr) {
            application->QueueCharacterEvent(wParam, lParam);
            return 0;
        }
        break;
    case WM_ERASEBKGND:
        return 1;
    case WM_DESTROY:
        if (application != nullptr) {
            application->m_hwnd = nullptr;
        }
        PostQuitMessage(0);
        return 0;
    default:
        break;
    }

    return DefWindowProcW(hwnd, message, wParam, lParam);
}

int RunXCUIEditorApp(HINSTANCE hInstance, int nCmdShow) {
    Application application;
    return application.Run(hInstance, nCmdShow);
}

} // namespace XCEngine::UI::Editor