XCEngine/editor/app/Platform/Win32/Windowing/EditorWindow.cpp

#include "Platform/Win32/Windowing/EditorWindow.h"
#include "Bootstrap/EditorResources.h"
#include "Platform/Win32/Chrome/EditorWindowChromeController.h"
#include "Platform/Win32/Windowing/EditorWindowSession.h"
#include "Platform/Win32/Windowing/EditorWindowSupport.h"
#include "Platform/Win32/Windowing/Win32EditorWindowRenderRuntimeSurface.h"
#include "Platform/Win32/Runtime/EditorWindowInputController.h"
#include "Windowing/Host/EditorWindowContentBindings.h"
#include <XCEditor/Docking/UIEditorDockHostTransfer.h>
#include <XCEditor/Foundation/UIEditorRuntimeTrace.h>
#include <XCEditor/Shell/UIEditorShellInteraction.h>
#include <XCEngine/UI/Types.h>
#include <cassert>
#include <algorithm>
#include <memory>
#include <optional>
#include <sstream>
#include <windowsx.h>
#include <XCEngine/UI/DrawData.h>
#include <cstdint>
#include <utility>
#include <XCEditor/Shell/UIEditorShellCapturePolicy.h>

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

UINT QuerySystemDpi() {
    HDC screenDc = GetDC(nullptr);
    if (screenDc == nullptr) {
        return kDefaultDpi;
    }

    const int dpiX = GetDeviceCaps(screenDc, LOGPIXELSX);
    ReleaseDC(nullptr, screenDc);
    return dpiX > 0 ? static_cast<UINT>(dpiX) : kDefaultDpi;
}

UINT QueryWindowDpi(HWND hwnd) {
    if (hwnd != nullptr) {
        const HMODULE user32 = GetModuleHandleW(L"user32.dll");
        if (user32 != nullptr) {
            using GetDpiForWindowFn = UINT(WINAPI*)(HWND);
            const auto getDpiForWindow =
                reinterpret_cast<GetDpiForWindowFn>(GetProcAddress(user32, "GetDpiForWindow"));
            if (getDpiForWindow != nullptr) {
                const UINT dpi = getDpiForWindow(hwnd);
                if (dpi != 0u) {
                    return dpi;
                }
            }
        }
    }

    return QuerySystemDpi();
}

bool ResolveVerboseRuntimeTraceEnabled() {
    return IsEditorWindowVerboseRuntimeTraceEnabled();
}

void LogRuntimeTrace(std::string_view channel, std::string_view message) {
    AppendUIEditorRuntimeTrace(channel, message);
}

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

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

using namespace EditorWindowSupport;
using ::XCEngine::UI::UIPoint;

POINT EditorWindow::ToNativePoint(const EditorWindowScreenPoint& screenPoint) {
    return POINT{
        static_cast<LONG>(screenPoint.x),
        static_cast<LONG>(screenPoint.y),
    };
}

EditorWindowScreenPoint EditorWindow::FromNativePoint(const POINT& screenPoint) {
    EditorWindowScreenPoint point = {};
    point.x = screenPoint.x;
    point.y = screenPoint.y;
    return point;
}

EditorWindow::EditorWindow(EditorHostWindow& owner)
    : m_owner(owner)
    , m_session(std::make_unique<EditorWindowSession>(
          std::string(owner.GetWindowId()),
          std::wstring(owner.GetTitle()),
          owner.IsWorkspaceWindow()
              ? EditorWindowCategory::Workspace
              : EditorWindowCategory::Utility,
          owner.GetChromePolicy(),
          owner.IsPrimary()))
    , m_chromeController(std::make_unique<EditorWindowChromeController>())
    , m_inputController(std::make_unique<EditorWindowInputController>()) {}

EditorWindow::~EditorWindow() {
    m_owner.DetachNativePeer(*this);
}

EditorHostWindow& EditorWindow::GetOwner() {
    return m_owner;
}

const EditorHostWindow& EditorWindow::GetOwner() const {
    return m_owner;
}

std::string_view EditorWindow::GetWindowId() const {
    return m_owner.GetWindowId();
}

HWND EditorWindow::GetHwnd() const {
    return m_session->GetHwnd();
}

bool EditorWindow::HasHwnd() const {
    return m_session->HasHwnd();
}

EditorWindowCategory EditorWindow::GetCategory() const {
    return m_owner.IsWorkspaceWindow()
        ? EditorWindowCategory::Workspace
        : EditorWindowCategory::Utility;
}

const EditorWindowChromePolicy& EditorWindow::GetChromePolicy() const {
    return m_owner.GetChromePolicy();
}

EditorWindowLifecycleState EditorWindow::GetLifecycleState() const {
    return m_owner.GetLifecycleState();
}

bool EditorWindow::IsPrimary() const {
    return m_owner.IsPrimary();
}

bool EditorWindow::IsWorkspaceWindow() const {
    return m_owner.IsWorkspaceWindow();
}

bool EditorWindow::IsUtilityWindow() const {
    return m_owner.IsUtilityWindow();
}

bool EditorWindow::IsClosing() const {
    return m_owner.IsClosing();
}

bool EditorWindow::IsDestroyed() const {
    return m_owner.IsDestroyed();
}

bool EditorWindow::HasLiveHostWindow() const {
    const HWND hwnd = m_session->GetHwnd();
    return hwnd != nullptr && IsWindow(hwnd);
}

EditorNativeWindowMetrics EditorWindow::CaptureMetrics() const {
    return EditorNativeWindowMetrics{
        .dpiScale = GetDpiScale(),
    };
}

bool EditorWindow::CaptureRuntimeSurface(
    const EditorHostWindow& window,
    EditorNativeWindowRuntimeSurface& outSurface) {
    (void)window;
    outSurface = {};
    const HWND hwnd = m_session->GetHwnd();
    if (hwnd == nullptr || !IsWindow(hwnd)) {
        return false;
    }

    std::uint32_t clientWidth = 0u;
    std::uint32_t clientHeight = 0u;
    if (!QueryCurrentClientPixelSize(clientWidth, clientHeight)) {
        clientWidth = 1u;
        clientHeight = 1u;
    }

    outSurface.renderSurface =
        std::make_shared<Win32EditorWindowRenderRuntimeSurface>(hwnd);
    outSurface.widthPixels = clientWidth;
    outSurface.heightPixels = clientHeight;
    outSurface.dpiScale = GetDpiScale();
    return true;
}

bool EditorWindow::CaptureFrameSnapshot(
    const EditorHostWindow& window,
    const UIEditorShellInteractionState& shellState,
    EditorNativeWindowFrameSnapshot& outSnapshot) {
    outSnapshot = {};
    if (!HasLiveHostWindow()) {
        return false;
    }

    std::uint32_t pixelWidth = 0u;
    std::uint32_t pixelHeight = 0u;
    if (!ResolveRenderClientPixelSize(pixelWidth, pixelHeight)) {
        return false;
    }

    SyncShellCapturedPointerButtonsFromSystemState(shellState);

    const float width = PixelsToDips(static_cast<float>(pixelWidth));
    const float height = PixelsToDips(static_cast<float>(pixelHeight));
    const bool useDetachedTitleBarTabStrip =
        ShouldUseDetachedTitleBarTabStrip(window);

    outSnapshot.widthPixels = pixelWidth;
    outSnapshot.heightPixels = pixelHeight;
    outSnapshot.widthDips = width;
    outSnapshot.heightDips = height;
    outSnapshot.dpiScale = GetDpiScale();
    outSnapshot.workspaceBounds = ResolveWorkspaceBounds(window, width, height);
    outSnapshot.inputEvents = TakePendingInputEvents();
    outSnapshot.cursorScreenPoint = QueryCursorScreenPoint();
    outSnapshot.useDetachedTitleBarTabStrip = useDetachedTitleBarTabStrip;
    return outSnapshot.IsValid();
}

void EditorWindow::ApplyFrameCommands(
    const EditorHostWindow& window,
    const EditorNativeWindowFrameCommands& commands) {
    if (commands.applyShellRuntimePointerCapture) {
        ApplyShellRuntimePointerCapture(window);
    }
    if (commands.applyCurrentCursor) {
        ApplyCurrentCursor();
    }
}

const std::wstring& EditorWindow::GetTitle() const {
    return m_owner.GetTitle();
}

std::string_view EditorWindow::GetCachedTitleText() const {
    return m_owner.GetCachedTitleText();
}

const EditorWorkspaceWindowProjection* EditorWindow::TryGetWorkspaceProjection() const {
    return m_owner.TryGetWorkspaceProjection();
}

EditorWindowDockHostBinding* EditorWindow::TryGetDockHostBinding() {
    return m_owner.TryGetDockHostBinding();
}

const EditorWindowDockHostBinding* EditorWindow::TryGetDockHostBinding() const {
    return m_owner.TryGetDockHostBinding();
}

void EditorWindow::AttachHwnd(HWND hwnd) {
    m_session->AttachHwnd(hwnd);
    m_owner.MarkNativeAttached();
}

void EditorWindow::ApplyHostWindowTitle(const std::wstring& title) {
    if (HasLiveHostWindow()) {
        SetWindowTextW(m_session->GetHwnd(), title.c_str());
    }
}

void EditorWindow::InvalidateHostWindow() const {
    if (const HWND hwnd = m_session->GetHwnd();
        hwnd != nullptr && IsWindow(hwnd)) {
        InvalidateRect(hwnd, nullptr, FALSE);
    }
}

void EditorWindow::PrepareRuntimeInitialization(EditorHostWindow& window) {
    (void)window;
    Host::RefreshBorderlessWindowDwmDecorations(m_session->GetHwnd());
    m_chromeController->Reset();
    m_chromeController->SetWindowDpi(QueryWindowDpi(m_session->GetHwnd()));
    m_chromeController->InitializeWindowChrome(*this);
}

void EditorWindow::ShutdownNativeInteraction() {
    std::ostringstream trace = {};
    trace << "EditorWindow::ShutdownNativeInteraction begin windowId='" << GetWindowId()
          << "' hwnd=0x" << std::hex << std::uppercase
          << reinterpret_cast<std::uintptr_t>(GetHwnd())
          << std::dec
          << " primary=" << (IsPrimary() ? 1 : 0)
          << " lifecycle=" << GetEditorWindowLifecycleStateName(GetLifecycleState());
    LogRuntimeTrace("window-close", trace.str());
    ForceReleasePointerCapture();

    m_inputController->ClearPendingEvents();
    m_chromeController->Reset();
    LogRuntimeTrace(
        "window-close",
        "EditorWindow::ShutdownNativeInteraction end windowId='" +
            std::string(GetWindowId()) + "'");
}

void EditorWindow::ResetNativeInteractionState() {
    ForceReleasePointerCapture();

    m_inputController->ResetInteractionState();
    m_chromeController->ResetChromeState();
    m_chromeController->EndBorderlessResize();
    m_chromeController->EndBorderlessWindowDragRestore();
    m_chromeController->EndInteractiveResize();
    m_chromeController->SetHoveredBorderlessResizeEdge(
        Host::BorderlessWindowResizeEdge::None);
    m_chromeController->ClearPredictedClientPixelSize();
}

bool EditorWindow::ApplyWindowResize(UINT width, UINT height) {
    if (!m_owner.IsRenderReady() || width == 0u || height == 0u) {
        return false;
    }
    return m_owner.ApplyResize(width, height);
}

bool EditorWindow::QueryCurrentClientPixelSize(
    std::uint32_t& outWidth,
    std::uint32_t& outHeight) const {
    outWidth = 0u;
    outHeight = 0u;
    const HWND hwnd = m_session->GetHwnd();
    if (hwnd == nullptr || !IsWindow(hwnd)) {
        return false;
    }

    RECT clientRect = {};
    if (!GetClientRect(hwnd, &clientRect)) {
        return false;
    }

    const LONG width = clientRect.right - clientRect.left;
    const LONG height = clientRect.bottom - clientRect.top;
    if (width <= 0 || height <= 0) {
        return false;
    }

    outWidth = static_cast<std::uint32_t>(width);
    outHeight = static_cast<std::uint32_t>(height);
    return true;
}

bool EditorWindow::ResolveRenderClientPixelSize(
    std::uint32_t& outWidth,
    std::uint32_t& outHeight) const {
    UINT nativeWidth = 0u;
    UINT nativeHeight = 0u;
    if (m_chromeController->TryGetPredictedClientPixelSize(nativeWidth, nativeHeight)) {
        outWidth = nativeWidth;
        outHeight = nativeHeight;
        return true;
    }

    return QueryCurrentClientPixelSize(outWidth, outHeight);
}

float EditorWindow::GetDpiScale() const {
    return m_chromeController->GetDpiScale(kBaseDpiScale);
}

float EditorWindow::PixelsToDips(float pixels) const {
    const float dpiScale = GetDpiScale();
    return dpiScale > 0.0f ? pixels / dpiScale : pixels;
}

UIPoint EditorWindow::ConvertClientPixelsToDips(LONG x, LONG y) const {
    return UIPoint(
        PixelsToDips(static_cast<float>(x)),
        PixelsToDips(static_cast<float>(y)));
}

UIPoint EditorWindow::ConvertScreenPixelsToClientDips(
    const EditorWindowScreenPoint& screenPoint) const {
    POINT clientPoint = ToNativePoint(screenPoint);
    if (const HWND hwnd = m_session->GetHwnd();
        hwnd != nullptr) {
        ScreenToClient(hwnd, &clientPoint);
    }

    const float dpiScale = m_chromeController->GetDpiScale(kBaseDpiScale);
    return UIPoint(
        dpiScale > 0.0f
            ? static_cast<float>(clientPoint.x) / dpiScale
            : static_cast<float>(clientPoint.x),
        dpiScale > 0.0f
            ? static_cast<float>(clientPoint.y) / dpiScale
            : static_cast<float>(clientPoint.y));
}

bool EditorWindow::TryResolveDockTabDragHotspot(
    std::string_view nodeId,
    std::string_view panelId,
    const EditorWindowScreenPoint& screenPoint,
    EditorWindowScreenPoint& outHotspot) const {
    const EditorWindowDockHostBinding* dockHostBinding = m_owner.TryGetDockHostBinding();
    if (dockHostBinding == nullptr) {
        outHotspot = {};
        return false;
    }

    const UIPoint clientPointDips = ConvertScreenPixelsToClientDips(screenPoint);
    UIPoint hotspotDips = {};
    if (!dockHostBinding->TryResolveDockTabDragHotspot(
            nodeId,
            panelId,
            clientPointDips,
            hotspotDips)) {
        outHotspot = {};
        return false;
    }

    const float dpiScale = GetDpiScale();
    outHotspot.x = static_cast<std::int32_t>(std::lround(hotspotDips.x * dpiScale));
    outHotspot.y = static_cast<std::int32_t>(std::lround(hotspotDips.y * dpiScale));
    return true;
}

bool EditorWindow::TryResolveDockTabDropTarget(
    const EditorWindowScreenPoint& screenPoint,
    UIEditorDockHostTabDropTarget& outTarget) const {
    const EditorWindowDockHostBinding* dockHostBinding = m_owner.TryGetDockHostBinding();
    if (dockHostBinding == nullptr) {
        outTarget = {};
        return false;
    }

    outTarget = dockHostBinding->ResolveDockTabDropTarget(
        ConvertScreenPixelsToClientDips(screenPoint));
    return outTarget.valid;
}

bool EditorWindow::TryGetHostScreenRect(EditorWindowScreenRect& outRect) const {
    outRect = {};

    RECT nativeRect = {};
    if (!HasLiveHostWindow() || !GetWindowRect(m_session->GetHwnd(), &nativeRect)) {
        return false;
    }

    outRect.left = nativeRect.left;
    outRect.top = nativeRect.top;
    outRect.right = nativeRect.right;
    outRect.bottom = nativeRect.bottom;
    return true;
}

void EditorWindow::SetHostScreenPosition(const EditorWindowScreenPoint& screenPoint) {
    if (!HasLiveHostWindow()) {
        return;
    }

    SetWindowPos(
        m_session->GetHwnd(),
        nullptr,
        screenPoint.x,
        screenPoint.y,
        0,
        0,
        SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE);
}

void EditorWindow::FocusHostWindow() {
    if (!HasLiveHostWindow()) {
        return;
    }

    ShowWindow(m_session->GetHwnd(), SW_RESTORE);
    SetForegroundWindow(m_session->GetHwnd());
}

void EditorWindow::PostCloseToHost() {
    if (HasLiveHostWindow()) {
        PostMessageW(m_session->GetHwnd(), WM_CLOSE, 0, 0);
    }
}

void EditorWindow::DestroyHostWindow() {
    if (HasLiveHostWindow()) {
        DestroyWindow(m_session->GetHwnd());
    }
}

bool EditorWindow::OnResize(UINT width, UINT height) {
    const bool matchedPresentedPrediction =
        m_chromeController->ConsumePresentedPredictedClientPixelSizeMatch(width, height);
    if (!matchedPresentedPrediction) {
        m_chromeController->ClearPredictedClientPixelSize();
    }
    if (const HWND hwnd = m_session->GetHwnd();
        hwnd != nullptr) {
        Host::RefreshBorderlessWindowDwmDecorations(hwnd);
    }

    if (matchedPresentedPrediction) {
        return false;
    }

    ApplyWindowResize(width, height);
    return true;
}

void EditorWindow::OnEnterSizeMove() {
    m_chromeController->BeginInteractiveResize();
}

bool EditorWindow::OnExitSizeMove() {
    m_chromeController->EndInteractiveResize();
    m_chromeController->ClearPredictedClientPixelSize();
    std::uint32_t width = 0u;
    std::uint32_t height = 0u;
    if (QueryCurrentClientPixelSize(width, height)) {
        ApplyWindowResize(static_cast<UINT>(width), static_cast<UINT>(height));
        return true;
    }
    return false;
}

void EditorWindow::OnDpiChanged(UINT dpi, const RECT& suggestedRect) {
    m_chromeController->SetWindowDpi(dpi == 0u ? kDefaultDpi : dpi);
    m_owner.SetDpiScale(GetDpiScale());
    if (const HWND hwnd = m_session->GetHwnd();
        hwnd != nullptr) {
        const LONG windowWidth = suggestedRect.right - suggestedRect.left;
        const LONG windowHeight = suggestedRect.bottom - suggestedRect.top;
        SetWindowPos(
            hwnd,
            nullptr,
            suggestedRect.left,
            suggestedRect.top,
            windowWidth,
            windowHeight,
            SWP_NOZORDER | SWP_NOACTIVATE);
        std::uint32_t clientWidth = 0u;
        std::uint32_t clientHeight = 0u;
        if (QueryCurrentClientPixelSize(clientWidth, clientHeight)) {
            ApplyWindowResize(static_cast<UINT>(clientWidth), static_cast<UINT>(clientHeight));
        }
        Host::RefreshBorderlessWindowDwmDecorations(hwnd);
    }

    std::ostringstream trace = {};
    trace << "dpi changed to " << m_chromeController->GetWindowDpi()
          << " scale=" << GetDpiScale();
    LogRuntimeTrace("window", trace.str());
}

bool EditorWindow::IsVerboseRuntimeTraceEnabled() {
    static const bool s_enabled = ResolveVerboseRuntimeTraceEnabled();
    return s_enabled;
}

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

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

using namespace EditorWindowSupport;
using ::XCEngine::UI::UIDrawData;
using ::XCEngine::UI::UIDrawList;
using ::XCEngine::UI::UIInputEvent;
using ::XCEngine::UI::UIInputModifiers;
using ::XCEngine::UI::UIPointerButton;
using ::XCEngine::UI::UIRect;

namespace {

std::optional<EditorWindowScreenPoint> QueryNativeCursorScreenPoint() {
    POINT screenPoint = {};
    if (!GetCursorPos(&screenPoint)) {
        return std::nullopt;
    }

    return EditorWindowScreenPoint{
        .x = screenPoint.x,
        .y = screenPoint.y,
    };
}

std::uint8_t ButtonMask(UIPointerButton button) {
    switch (button) {
    case UIPointerButton::Left: return 1u << 0u;
    case UIPointerButton::Right: return 1u << 1u;
    case UIPointerButton::Middle: return 1u << 2u;
    case UIPointerButton::X1: return 1u << 3u;
    case UIPointerButton::X2: return 1u << 4u;
    case UIPointerButton::None:
    default:
        return 0u;
    }
}

std::uint8_t ButtonMaskFromModifiers(const UIInputModifiers& modifiers) {
    std::uint8_t mask = 0u;
    if (modifiers.leftMouse) {
        mask |= ButtonMask(UIPointerButton::Left);
    }
    if (modifiers.rightMouse) {
        mask |= ButtonMask(UIPointerButton::Right);
    }
    if (modifiers.middleMouse) {
        mask |= ButtonMask(UIPointerButton::Middle);
    }
    if (modifiers.x1Mouse) {
        mask |= ButtonMask(UIPointerButton::X1);
    }
    if (modifiers.x2Mouse) {
        mask |= ButtonMask(UIPointerButton::X2);
    }
    return mask;
}

std::uint8_t ResolveExpectedShellCaptureButtons(
    const UIEditorShellInteractionState& shellState) {
    std::uint8_t expectedButtons = 0u;
    const auto& dockHostState =
        shellState.workspaceInteractionState.dockHostInteractionState;
    if (dockHostState.splitterDragState.active ||
        !dockHostState.activeTabDragNodeId.empty()) {
        expectedButtons |= ButtonMask(UIPointerButton::Left);
    }

    for (const auto& panelState :
         shellState.workspaceInteractionState.composeState.panelStates) {
        const auto& inputBridgeState = panelState.viewportShellState.inputBridgeState;
        if (inputBridgeState.captured) {
            expectedButtons |= ButtonMask(inputBridgeState.captureButton);
        }
    }

    return expectedButtons;
}

} // namespace

void EditorWindow::ValidateHostFrame() const {
    if (const HWND hwnd = m_session->GetHwnd();
        hwnd != nullptr && IsWindow(hwnd)) {
        ValidateRect(hwnd, nullptr);
    }
}

void EditorWindow::QueueCompletedImmediateFrame(
    EditorWindowFrameTransferRequests transferRequests) {
    m_session->QueueCompletedImmediateFrame(std::move(transferRequests));
}

bool EditorWindow::HasQueuedCompletedImmediateFrame() const {
    return m_session->HasQueuedCompletedImmediateFrame();
}

EditorWindowFrameTransferRequests
EditorWindow::ConsumeQueuedCompletedImmediateFrameTransferRequests() {
    return m_session->ConsumeQueuedCompletedImmediateFrameTransferRequests();
}

void EditorWindow::RequestSkipNextSteadyStateFrame() {
    m_chromeController->RequestSkipNextSteadyStateFrame();
}

bool EditorWindow::ConsumeSkipNextSteadyStateFrame() {
    return m_chromeController->ConsumeSkipNextSteadyStateFrame();
}

UIRect EditorWindow::ResolveWorkspaceBounds(
    const EditorHostWindow& window,
    float clientWidthDips,
    float clientHeightDips) const {
    if (ShouldUseDetachedTitleBarTabStrip(window)) {
        return UIRect(0.0f, 0.0f, clientWidthDips, clientHeightDips);
    }

    const float titleBarHeight = (std::min)(kBorderlessTitleBarHeightDips, clientHeightDips);
    return UIRect(
        0.0f,
        titleBarHeight,
        clientWidthDips,
        (std::max)(0.0f, clientHeightDips - titleBarHeight));
}

bool EditorWindow::ShouldUseDetachedTitleBarTabStrip(
    const EditorHostWindow& window) const {
    return m_chromeController->ShouldUseDetachedTitleBarTabStrip(window);
}

std::vector<UIInputEvent> EditorWindow::TakePendingInputEvents() {
    return m_inputController->TakePendingEvents();
}

std::optional<EditorWindowScreenPoint> EditorWindow::QueryCursorScreenPoint() const {
    return QueryNativeCursorScreenPoint();
}

void EditorWindow::SyncShellCapturedPointerButtonsFromSystemState(
    const UIEditorShellInteractionState& shellState) {
    m_inputController->SyncInputModifiersFromSystemState();

    const std::uint8_t expectedButtons = ResolveExpectedShellCaptureButtons(shellState);
    if (expectedButtons == 0u ||
        m_inputController->HasPendingPointerStateReconciliationEvent()) {
        return;
    }

    const UIInputModifiers modifiers = m_inputController->GetCurrentModifiers();
    if ((ButtonMaskFromModifiers(modifiers) & expectedButtons) == expectedButtons) {
        return;
    }

    QueueSyntheticPointerStateSyncEvent(modifiers);
}

void EditorWindow::ApplyShellRuntimePointerCapture(const EditorHostWindow& window) {
    const EditorWindowInputFeedbackBinding* inputFeedbackBinding =
        window.TryGetInputFeedbackBinding();
    if (inputFeedbackBinding != nullptr &&
        inputFeedbackBinding->HasShellInteractiveCapture()) {
        AcquirePointerCapture(EditorWindowPointerCaptureOwner::Shell);
        return;
    }

    if (inputFeedbackBinding != nullptr &&
        inputFeedbackBinding->HasHostedContentCapture()) {
        AcquirePointerCapture(EditorWindowPointerCaptureOwner::HostedContent);
        return;
    }

    if (OwnsPointerCapture(EditorWindowPointerCaptureOwner::Shell)) {
        ReleasePointerCapture(EditorWindowPointerCaptureOwner::Shell);
    }

    if (OwnsPointerCapture(EditorWindowPointerCaptureOwner::HostedContent)) {
        ReleasePointerCapture(EditorWindowPointerCaptureOwner::HostedContent);
    }
}

void EditorWindow::AppendChrome(
    const EditorHostWindow& window,
    UIDrawList& drawList,
    float clientWidthDips) const {
    m_chromeController->AppendChrome(window, drawList, clientWidthDips);
}

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

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

using ::XCEngine::UI::UIInputEventType;
using ::XCEngine::UI::UIPointerButton;

namespace {

bool IsScreenPointOverWindow(HWND hwnd, const POINT& screenPoint) {
    if (hwnd == nullptr || !IsWindow(hwnd)) {
        return false;
    }

    const HWND hitWindow = WindowFromPoint(screenPoint);
    if (hitWindow == nullptr || GetAncestor(hitWindow, GA_ROOT) != hwnd) {
        return false;
    }

    RECT windowRect = {};
    if (!GetWindowRect(hwnd, &windowRect)) {
        return false;
    }

    return screenPoint.x >= windowRect.left && screenPoint.x < windowRect.right &&
        screenPoint.y >= windowRect.top && screenPoint.y < windowRect.bottom;
}
} // namespace

bool EditorWindow::ApplyCurrentCursor() const {
    if (!HasInteractiveCaptureState() && !IsPointerInsideClientArea()) {
        return false;
    }

    const HCURSOR cursor = LoadCursorW(nullptr, ResolveCurrentCursorResource());
    if (cursor == nullptr) {
        return false;
    }

    SetCursor(cursor);
    return true;
}


bool EditorWindow::HasInteractiveCaptureState() const {
    const EditorWindowInputFeedbackBinding* inputFeedbackBinding =
        m_owner.TryGetInputFeedbackBinding();
    return (inputFeedbackBinding != nullptr && inputFeedbackBinding->HasInteractiveCapture()) ||
        m_chromeController->IsBorderlessWindowDragRestoreArmed() ||
        m_chromeController->IsBorderlessResizeActive() ||
        m_inputController->HasPointerCaptureOwner();
}

bool EditorWindow::OwnsPointerCapture(EditorWindowPointerCaptureOwner owner) const {
    return m_inputController->OwnsPointerCapture(owner);
}

void EditorWindow::AcquirePointerCapture(EditorWindowPointerCaptureOwner owner) {
    m_inputController->AcquirePointerCapture(m_session->GetHwnd(), owner);
}

void EditorWindow::ReleasePointerCapture(EditorWindowPointerCaptureOwner owner) {
    m_inputController->ReleasePointerCapture(m_session->GetHwnd(), owner);
}

void EditorWindow::ForceReleasePointerCapture() {
    m_inputController->ForceReleasePointerCapture(m_session->GetHwnd());
}

void EditorWindow::TryStartImmediateShellPointerCapture(LPARAM lParam) {
    const HWND hwnd = m_session->GetHwnd();
    if (hwnd == nullptr ||
        !IsWindow(hwnd) ||
        GetCapture() == hwnd) {
        return;
    }

    const ::XCEngine::UI::UIPoint clientPoint = ConvertClientPixelsToDips(
        GET_X_LPARAM(lParam),
        GET_Y_LPARAM(lParam));
    if (!ShouldStartImmediateUIEditorShellPointerCapture(
            m_owner.GetShellFrame(),
            clientPoint)) {
        return;
    }

    AcquirePointerCapture(EditorWindowPointerCaptureOwner::Shell);
}

void EditorWindow::QueuePointerEvent(
    UIInputEventType type,
    UIPointerButton button,
    WPARAM wParam,
    LPARAM lParam,
    bool doubleClick) {
    m_inputController->QueuePointerEvent(
        type,
        button,
        ConvertClientPixelsToDips(GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam)),
        wParam,
        doubleClick);
}

void EditorWindow::QueueSyntheticPointerStateSyncEvent(
    const ::XCEngine::UI::UIInputModifiers& modifiers) {
    const HWND hwnd = m_session->GetHwnd();
    if (hwnd == nullptr || !IsWindow(hwnd)) {
        return;
    }

    POINT screenPoint = {};
    if (!GetCursorPos(&screenPoint)) {
        return;
    }
    if (!ScreenToClient(hwnd, &screenPoint)) {
        return;
    }

    m_inputController->QueueSyntheticPointerStateSyncEvent(
        ConvertClientPixelsToDips(screenPoint.x, screenPoint.y),
        modifiers);
}

void EditorWindow::QueuePointerLeaveEvent() {
    ::XCEngine::UI::UIPoint position = {};
    if (const HWND hwnd = m_session->GetHwnd();
        hwnd != nullptr) {
        POINT clientPoint = {};
        GetCursorPos(&clientPoint);
        ScreenToClient(hwnd, &clientPoint);
        position = ConvertClientPixelsToDips(clientPoint.x, clientPoint.y);
    }
    m_inputController->QueuePointerLeaveEvent(position);
}

void EditorWindow::QueuePointerWheelEvent(short wheelDelta, WPARAM wParam, LPARAM lParam) {
    if (m_session->GetHwnd() == nullptr) {
        return;
    }

    POINT screenPoint = {
        GET_X_LPARAM(lParam),
        GET_Y_LPARAM(lParam)
    };
    ScreenToClient(m_session->GetHwnd(), &screenPoint);

    m_inputController->QueuePointerWheelEvent(
        ConvertClientPixelsToDips(screenPoint.x, screenPoint.y),
        wheelDelta,
        wParam);
}

bool EditorWindow::IsPointerInsideClientArea() const {
    const HWND hwnd = m_session->GetHwnd();
    if (hwnd == nullptr || !IsWindow(hwnd)) {
        return false;
    }

    POINT screenPoint = {};
    if (!GetCursorPos(&screenPoint)) {
        return false;
    }

    if (!IsScreenPointOverWindow(hwnd, screenPoint)) {
        return false;
    }

    const LPARAM pointParam = MAKELPARAM(
        static_cast<SHORT>(screenPoint.x),
        static_cast<SHORT>(screenPoint.y));
    return SendMessageW(hwnd, WM_NCHITTEST, 0, pointParam) == HTCLIENT;
}

LPCWSTR EditorWindow::ResolveCurrentCursorResource() const {
    const EditorWindowInputFeedbackBinding* inputFeedbackBinding =
        m_owner.TryGetInputFeedbackBinding();
    const Host::BorderlessWindowResizeEdge borderlessResizeEdge =
        m_chromeController->IsBorderlessResizeActive()
            ? m_chromeController->GetBorderlessResizeEdge()
            : m_chromeController->GetHoveredBorderlessResizeEdge();
    if (borderlessResizeEdge != Host::BorderlessWindowResizeEdge::None) {
        return Host::ResolveBorderlessWindowResizeCursor(borderlessResizeEdge);
    }

    const EditorWindowContentCursorKind hostedContentCursorKind =
        inputFeedbackBinding != nullptr
            ? inputFeedbackBinding->GetHostedContentCursorKind()
            : EditorWindowContentCursorKind::Arrow;
    switch (hostedContentCursorKind) {
    case EditorWindowContentCursorKind::ResizeEW:
        return IDC_SIZEWE;
    case EditorWindowContentCursorKind::ResizeNS:
        return IDC_SIZENS;
    case EditorWindowContentCursorKind::Arrow:
    default:
        break;
    }

    const EditorWindowContentCursorKind dockCursorKind =
        inputFeedbackBinding != nullptr
            ? inputFeedbackBinding->GetDockCursorKind()
            : EditorWindowContentCursorKind::Arrow;
    switch (dockCursorKind) {
    case EditorWindowContentCursorKind::ResizeEW:
        return IDC_SIZEWE;
    case EditorWindowContentCursorKind::ResizeNS:
        return IDC_SIZENS;
    case EditorWindowContentCursorKind::Arrow:
    default:
        return IDC_ARROW;
    }
}

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