#include "Application.hpp"

#include <algorithm>
#include <cmath>

#include <commdlg.h>
#include <shellapi.h>
#include <windowsx.h>

#include "CsvTable.hpp"
#include "Utf8Util.hpp"

#ifndef WM_DPICHANGED
#define WM_DPICHANGED 0x02E0
#endif

#ifndef DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2
#define DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2 (reinterpret_cast<HANDLE>(-4))
#endif

namespace jdi
{

	namespace
	{
		const wchar_t* kWindowClassName = L"JustDataInspectorMainWindow";	/**< 窗口类名。 */
		const wchar_t* kWindowTitle = L"Just DataInspector";				/**< 默认窗口标题。 */
		const float kStatusBarHeight = 26.0f;								/**< 状态栏高度（逻辑像素）。 */
		const float kSplitterWidth = 4.0f;									/**< 分隔条宽度（逻辑像素）。 */
		const float kMinPanelWidth = 260.0f;								/**< 面板最小宽度（逻辑像素）。 */
		const float kMaxPanelWidth = 400.0f;								/**< 面板最大宽度（逻辑像素）。 */
		const int kMinClientWidth = 860;									/**< 窗口最小客户区宽度。 */
		const int kMinClientHeight = 540;									/**< 窗口最小客户区高度。 */
		const UINT kMessageRemoveFile = WM_APP + 1;							/**< 面板请求移除文件的自定义消息。 */
		const wchar_t* kStatusHint =
		    L"滚轮纵向滚动网格 · Shift+滚轮平移 · 双击绘图区恢复自适应 · Esc 关闭光标";

		/** @brief 标签页右键菜单命令 ID。 */
		const int kMenuTabNew = 1;
		const int kMenuTabClose = 2;
		const int kMenuTabCloseOthers = 3;

		/**
		 * @brief 开启进程级 DPI 感知（优先 Per-Monitor V2）。
		 */
		void EnableDpiAwareness()
		{
			HMODULE user32 = GetModuleHandleW(L"user32.dll");
			if (user32 != nullptr)
			{
				typedef BOOL(WINAPI * SetProcessDpiAwarenessContextFn)(HANDLE);
				SetProcessDpiAwarenessContextFn setContext =
				    reinterpret_cast<SetProcessDpiAwarenessContextFn>(
				        reinterpret_cast<void*>(GetProcAddress(user32, "SetProcessDpiAwarenessContext")));
				if (setContext != nullptr && setContext(DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2) != FALSE)
				{
					return;
				}
			}
			SetProcessDPIAware();
		}

		/**
		 * @brief 查询屏幕 DPI。
		 * @return DPI 数值，失败时返回 96。
		 */
		UINT QuerySystemDpi()
		{
			HDC hdc = GetDC(nullptr);
			if (hdc == nullptr)
			{
				return 96u;
			}
			const int dpi = GetDeviceCaps(hdc, LOGPIXELSX);
			ReleaseDC(nullptr, hdc);
			return (dpi > 0) ? static_cast<UINT>(dpi) : 96u;
		}

		/**
		 * @brief 依据 DPI 缩放逻辑像素。
		 * @param [IN] value 逻辑像素值。
		 * @param [IN] scale 缩放比例。
		 * @return 物理像素值。
		 */
		float ScaleOf(float value, float scale)
		{
			return value * scale;
		}
	}

	Application& Application::Instance()
	{
		static Application instance;
		return instance;
	}

	LRESULT CALLBACK Application::WindowProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
	{
		Application* self = reinterpret_cast<Application*>(GetWindowLongPtrW(hwnd, GWLP_USERDATA));
		if (message == WM_NCCREATE)
		{
			CREATESTRUCTW* createStruct = reinterpret_cast<CREATESTRUCTW*>(lParam);
			self = reinterpret_cast<Application*>(createStruct->lpCreateParams);
			SetWindowLongPtrW(hwnd, GWLP_USERDATA, reinterpret_cast<LONG_PTR>(self));
		}

		if (self != nullptr)
		{
			return self->HandleMessage(hwnd, message, wParam, lParam);
		}
		return DefWindowProcW(hwnd, message, wParam, lParam);
	}

	int Application::Run(HINSTANCE instance, int showCommand)
	{
		if (!Initialize(instance, showCommand))
		{
			return 1;
		}

		MSG message = {};
		while (GetMessageW(&message, nullptr, 0, 0) > 0)
		{
			TranslateMessage(&message);
			DispatchMessageW(&message);
		}

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

	bool Application::Initialize(HINSTANCE instance, int showCommand)
	{
		m_instance = instance;

		EnableDpiAwareness();
		m_dpi = QuerySystemDpi();
		m_scale = static_cast<float>(m_dpi) / 96.0f;

		gd::GdiplusStartupInput startupInput;
		if (gd::GdiplusStartup(&m_gdiplusToken, &startupInput, nullptr) != gd::Ok)
		{
			MessageBoxW(nullptr, L"GDI+ 初始化失败，程序无法启动。", kWindowTitle, MB_ICONERROR | MB_OK);
			return false;
		}
		m_gdiplusReady = true;

		m_theme = SolarizedLight();
		if (!m_fonts.Create(m_dpi))
		{
			m_gdiplusReady = false;
			gd::GdiplusShutdown(m_gdiplusToken);
			MessageBoxW(nullptr, L"界面字体创建失败，程序无法启动。", kWindowTitle, MB_ICONERROR | MB_OK);
			return false;
		}

		WNDCLASSEXW windowClass = {};
		windowClass.cbSize = sizeof(windowClass);
		windowClass.style = CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS;
		windowClass.lpfnWndProc = &Application::WindowProc;
		windowClass.hInstance = instance;
		windowClass.hCursor = LoadCursorW(nullptr, IDC_ARROW);
		windowClass.hbrBackground = nullptr;
		windowClass.lpszClassName = kWindowClassName;
		windowClass.hIcon = LoadIconW(nullptr, IDI_APPLICATION);
		windowClass.hIconSm = windowClass.hIcon;

		if (RegisterClassExW(&windowClass) == 0)
		{
			MessageBoxW(nullptr, L"窗口类注册失败。", kWindowTitle, MB_ICONERROR | MB_OK);
			return false;
		}

		// 依据工作区（排除任务栏）计算默认窗口尺寸并居中，避免窗口超出屏幕。
		RECT workArea = {0, 0, static_cast<LONG>(ScaleOf(1380.0f, m_scale)),
		                 static_cast<LONG>(ScaleOf(880.0f, m_scale))};
		SystemParametersInfoW(SPI_GETWORKAREA, 0, &workArea, 0);

		const int workWidth = workArea.right - workArea.left;
		const int workHeight = workArea.bottom - workArea.top;
		const int windowWidth = std::min(static_cast<int>(ScaleOf(1380.0f, m_scale)), workWidth - 24);
		const int windowHeight = std::min(static_cast<int>(ScaleOf(880.0f, m_scale)), workHeight - 24);
		const int windowX = workArea.left + std::max(0, (workWidth - windowWidth) / 2);
		const int windowY = workArea.top + std::max(0, (workHeight - windowHeight) / 2);

		m_hwnd = CreateWindowExW(WS_EX_ACCEPTFILES, kWindowClassName, kWindowTitle, WS_OVERLAPPEDWINDOW,
		                         windowX, windowY, windowWidth, windowHeight, nullptr, nullptr, instance,
		                         this);
		if (m_hwnd == nullptr)
		{
			MessageBoxW(nullptr, L"窗口创建失败。", kWindowTitle, MB_ICONERROR | MB_OK);
			return false;
		}

		m_tabBar.Setup(&m_fonts, &m_theme);
		m_tabBar.SetScale(m_scale);
		m_toolbar.Setup(&m_fonts, &m_theme);
		m_toolbar.SetScale(m_scale);
		m_menu.Setup(&m_fonts, &m_theme);
		m_menu.SetScale(m_scale);
		m_colorPicker.Setup(&m_fonts, &m_theme);
		m_colorPicker.SetScale(m_scale);
		m_panel.Setup(m_hwnd, &m_fonts, &m_theme, &m_menu, &m_colorPicker);
		m_panel.SetScale(m_scale);
		m_plot.Setup(&m_fonts, &m_theme);
		m_plot.SetScale(m_scale);

		HICON icon = LoadIconW(nullptr, IDI_APPLICATION);
		SendMessageW(m_hwnd, WM_SETICON, ICON_BIG, reinterpret_cast<LPARAM>(icon));
		SendMessageW(m_hwnd, WM_SETICON, ICON_SMALL, reinterpret_cast<LPARAM>(icon));

		// 创建首个标签页。
		NewTab();

		Relayout();
		ShowWindow(m_hwnd, showCommand);
		UpdateWindow(m_hwnd);
		LoadCommandLineFiles();
		return true;
	}

	void Application::Shutdown()
	{
		ReleaseBackBuffer();
		m_fonts.Destroy();

		if (m_gdiplusReady)
		{
			gd::GdiplusShutdown(m_gdiplusToken);
			m_gdiplusReady = false;
		}
	}

	void Application::ApplyDpi(UINT dpi)
	{
		if (dpi == 0)
		{
			return;
		}

		m_dpi = dpi;
		m_scale = static_cast<float>(dpi) / 96.0f;

		m_fonts.Create(dpi);
		m_tabBar.SetScale(m_scale);
		m_toolbar.SetScale(m_scale);
		m_menu.SetScale(m_scale);
		m_colorPicker.SetScale(m_scale);
		m_panel.SetScale(m_scale);
		m_plot.SetScale(m_scale);
		ReleaseBackBuffer();
		Relayout();
	}

	TabConfig& Application::ActiveTab()
	{
		static TabConfig fallback;
		if (m_activeTab < 0 || m_activeTab >= static_cast<int>(m_tabs.size()))
		{
			return fallback;
		}
		return m_tabs[static_cast<std::size_t>(m_activeTab)];
	}

	const TabConfig& Application::ActiveTab() const
	{
		static const TabConfig fallback;
		if (m_activeTab < 0 || m_activeTab >= static_cast<int>(m_tabs.size()))
		{
			return fallback;
		}
		return m_tabs[static_cast<std::size_t>(m_activeTab)];
	}

	void Application::NewTab()
	{
		TabConfig tab;
		tab.SetName(NextTabName());
		tab.SyncToDataSet(m_dataSet);

		m_tabs.push_back(std::move(tab));
		SetActiveTab(static_cast<int>(m_tabs.size()) - 1);
	}

	std::wstring Application::NextTabName() const
	{
		// 取当前未被占用的最小编号，使关闭标签页后编号可以被复用（3 开 2 关再新建回到「视图 2」）。
		for (int number = 1; number <= static_cast<int>(m_tabs.size()) + 1; ++number)
		{
			const std::wstring candidate = L"视图 " + std::to_wstring(number);
			bool used = false;
			for (const TabConfig& tab : m_tabs)
			{
				if (tab.Name() == candidate)
				{
					used = true;
					break;
				}
			}
			if (!used)
			{
				return candidate;
			}
		}
		return L"视图 " + std::to_wstring(m_tabs.size() + 1);
	}

	void Application::CloseTab(int index)
	{
		if (index < 0 || index >= static_cast<int>(m_tabs.size()))
		{
			return;
		}
		if (m_tabs.size() <= 1)
		{
			SetStatusMessage(L"至少需要保留一个标签页。", true);
			return;
		}

		m_tabs.erase(m_tabs.begin() + index);

		int next = index;
		if (next >= static_cast<int>(m_tabs.size()))
		{
			next = static_cast<int>(m_tabs.size()) - 1;
		}
		SetActiveTab(next);
	}

	void Application::SetActiveTab(int index)
	{
		if (index < 0 || index >= static_cast<int>(m_tabs.size()))
		{
			return;
		}

		m_activeTab = index;

		// 重新绑定上下文：面板与绘图区均指向同一数据层与当前标签页配置。
		m_panel.SetContext(&m_dataSet, &m_tabs[static_cast<std::size_t>(m_activeTab)]);
		m_plot.SetContext(&m_dataSet, &m_tabs[static_cast<std::size_t>(m_activeTab)]);

		RefreshTabBar();
		Relayout();

		// 切换标签页后把该页已选中的信号滚动到可见位置。
		m_panel.ScrollToSignal(m_tabs[static_cast<std::size_t>(m_activeTab)].Selected());

		SynchronizeView(true);
		UpdateWindowTitle();
		InvalidateRect(m_hwnd, nullptr, TRUE);
	}

	void Application::RefreshTabBar()
	{
		std::vector<std::wstring> names;
		names.reserve(m_tabs.size());
		for (const TabConfig& tab : m_tabs)
		{
			names.push_back(tab.Name());
		}
		m_tabBar.SetTabs(names);
		m_tabBar.SetActiveIndex(m_activeTab);
	}

	void Application::SynchronizeView(bool force)
	{
		if (m_tabs.empty() || m_activeTab < 0)
		{
			return;
		}

		TabConfig& tab = m_tabs[static_cast<std::size_t>(m_activeTab)];

		const int visibleCount = tab.VisibleCount();
		const bool anyVisible = tab.AnyVisible();
		const std::size_t laneCount = tab.Lanes().size();

		const bool changed = (visibleCount != m_cachedVisibleCount) || (anyVisible != m_cachedAnyVisible) ||
		                     (laneCount != m_cachedLaneCount);
		if (!changed && !force)
		{
			return;
		}

		const std::size_t previousLaneCount = m_cachedLaneCount;
		m_cachedVisibleCount = visibleCount;
		m_cachedAnyVisible = anyVisible;
		m_cachedLaneCount = laneCount;

		// 标签页首次出现可见信号时，把时间轴对齐到可见数据的范围。
		if (anyVisible && !tab.ViewInitialized())
		{
			m_plot.FitAll();
		}

		const bool laneCountChanged = (laneCount != previousLaneCount);
		if (laneCountChanged || force)
		{
			// 网格数量变化会影响滚动条与绘图区宽度，必须重新布局。
			Relayout();
		}
		else
		{
			m_plot.RefreshLanes();
		}
	}

	void Application::SyncTabsToDataSet()
	{
		for (TabConfig& tab : m_tabs)
		{
			tab.SyncToDataSet(m_dataSet);
		}
		m_panel.InvalidateRows();

		// 强制下一次同步重新计算视图状态。
		m_cachedVisibleCount = -1;
		m_cachedAnyVisible = false;
		m_cachedLaneCount = 0;

		if (m_hwnd != nullptr)
		{
			InvalidateRect(m_hwnd, nullptr, TRUE);
		}
	}

	void Application::RemoveFile(int fileIndex)
	{
		const DataFile* file = m_dataSet.FileAt(fileIndex);
		if (file == nullptr)
		{
			return;
		}
		const std::wstring name = file->fileName;

		// 先按旧下标修正各标签页配置，再从数据层移除，最后统一对齐。
		for (TabConfig& tab : m_tabs)
		{
			tab.RemapAfterFileRemoval(fileIndex);
		}
		m_dataSet.RemoveFile(fileIndex);
		SyncTabsToDataSet();

		SetStatusMessage(L"已从工作区移除：" + name, false);
		UpdateWindowTitle();
	}

	void Application::Relayout()
	{
		RECT client = {};
		GetClientRect(m_hwnd, &client);
		const float width = static_cast<float>(client.right - client.left);
		const float height = static_cast<float>(client.bottom - client.top);
		if (width <= 1.0f || height <= 1.0f)
		{
			return;
		}

		const float tabBarHeight = m_tabBar.DesiredHeight();
		const float toolbarHeight = m_toolbar.DesiredHeight();
		const float statusHeight = ScaleOf(kStatusBarHeight, m_scale);
		const float splitterWidth = ScaleOf(kSplitterWidth, m_scale);

		m_tabBarRect = gd::RectF(0.0f, 0.0f, width, tabBarHeight);
		m_toolbarRect = gd::RectF(0.0f, m_tabBarRect.Y + m_tabBarRect.Height, width, toolbarHeight);
		m_statusRect = gd::RectF(0.0f, height - statusHeight, width, statusHeight);

		const float contentTop = m_toolbarRect.Y + m_toolbarRect.Height;
		const float contentHeight = std::max(0.0f, m_statusRect.Y - contentTop);

		float panelWidth = ScaleOf(m_panelWidth, m_scale);
		const float maximum = std::min(ScaleOf(kMaxPanelWidth, m_scale), width * 0.45f);
		panelWidth = std::max(ScaleOf(kMinPanelWidth, m_scale), std::min(panelWidth, maximum));
		m_panelWidth = panelWidth / m_scale;

		m_panelRect = gd::RectF(0.0f, contentTop, panelWidth, contentHeight);
		m_splitterRect = gd::RectF(panelWidth, contentTop, splitterWidth, contentHeight);
		m_plotRect = gd::RectF(panelWidth + splitterWidth, contentTop,
		                       std::max(0.0f, width - panelWidth - splitterWidth), contentHeight);

		m_tabBar.Layout(m_tabBarRect);
		m_toolbar.Layout(m_toolbarRect);
		m_panel.SetClientBounds(gd::RectF(0.0f, 0.0f, width, height));
		m_panel.Layout(m_panelRect);
		m_plot.Layout(m_plotRect);
	}

	void Application::EnsureBackBuffer(int width, int height)
	{
		if (m_backDc != nullptr && width == m_backWidth && height == m_backHeight)
		{
			return;
		}

		ReleaseBackBuffer();

		HDC screenDc = GetDC(m_hwnd);
		if (screenDc == nullptr)
		{
			return;
		}
		m_backDc = CreateCompatibleDC(screenDc);
		if (m_backDc != nullptr)
		{
			m_backBitmap = CreateCompatibleBitmap(screenDc, width, height);
			if (m_backBitmap != nullptr)
			{
				m_backOldBitmap = SelectObject(m_backDc, m_backBitmap);
				m_backWidth = width;
				m_backHeight = height;
			}
			else
			{
				DeleteDC(m_backDc);
				m_backDc = nullptr;
			}
		}
		ReleaseDC(m_hwnd, screenDc);
	}

	void Application::ReleaseBackBuffer()
	{
		if (m_backDc != nullptr)
		{
			if (m_backOldBitmap != nullptr)
			{
				SelectObject(m_backDc, m_backOldBitmap);
				m_backOldBitmap = nullptr;
			}
			DeleteDC(m_backDc);
			m_backDc = nullptr;
		}
		if (m_backBitmap != nullptr)
		{
			DeleteObject(m_backBitmap);
			m_backBitmap = nullptr;
		}
		m_backWidth = 0;
		m_backHeight = 0;
	}

	void Application::Render()
	{
		RECT client = {};
		GetClientRect(m_hwnd, &client);
		const int width = client.right - client.left;
		const int height = client.bottom - client.top;
		if (width <= 0 || height <= 0)
		{
			return;
		}

		EnsureBackBuffer(width, height);
		if (m_backDc == nullptr)
		{
			return;
		}

		// 面板内展开/收起自定义颜色面板等操作会改变面板所需高度。
		if (m_panel.TakeLayoutDirty())
		{
			Relayout();
		}

		// 任何交互（勾选、移动网格、切换标签页）之后都在此统一收敛视图状态。
		SynchronizeView(false);

		m_toolbar.SetDocumentLoaded(!m_dataSet.Empty());
		if (!m_dataSet.Empty())
		{
			m_toolbar.SetStatusText(L"视图 " + FormatValue(m_plot.ViewMinTime()) + L" ~ " +
			                        FormatValue(m_plot.ViewMaxTime()));
		}
		else
		{
			m_toolbar.SetStatusText(std::wstring());
		}

		// 工具栏可切换按钮的选中状态始终与当前标签页配置保持一致。
		m_toolbar.SetToggleState(ToolbarAction::ZOOM_TIME,
		                         m_plot.CurrentZoomMode() == PlotZoomMode::TIME);
		m_toolbar.SetToggleState(ToolbarAction::ZOOM_VALUE,
		                         m_plot.CurrentZoomMode() == PlotZoomMode::VALUE);
		m_toolbar.SetToggleState(ToolbarAction::CURSOR, m_plot.CursorEnabled());

		{
			gd::Graphics g(m_backDc);
			g.SetSmoothingMode(gd::SmoothingModeAntiAlias);
			g.SetPixelOffsetMode(gd::PixelOffsetModeHalf);
			g.SetTextRenderingHint(gd::TextRenderingHintClearTypeGridFit);

			UiFillRect(g, gd::RectF(0.0f, 0.0f, static_cast<float>(width), static_cast<float>(height)),
			           m_theme.windowBg);

			m_tabBar.Paint(g);
			m_toolbar.Paint(g);
			m_panel.Paint(g);
			m_plot.Paint(g);

			UiFillRect(g, m_splitterRect, m_theme.border);

			PaintStatusBar(g);

			// 弹出菜单与浮动拾色器始终绘制在最上层，保证与主界面风格一致。
			m_menu.Paint(g);
			m_colorPicker.Paint(g);
		}

		HDC windowDc = GetDC(m_hwnd);
		if (windowDc != nullptr)
		{
			BitBlt(windowDc, 0, 0, width, height, m_backDc, 0, 0, SRCCOPY);
			ReleaseDC(m_hwnd, windowDc);
		}
	}

	void Application::PaintStatusBar(gd::Graphics& g)
	{
		UiFillRect(g, m_statusRect, m_theme.statusBg);
		UiDrawLine(g, m_statusRect.X, m_statusRect.Y, m_statusRect.X + m_statusRect.Width, m_statusRect.Y,
		           m_theme.border, 1.0f);

		const float padding = ScaleOf(12.0f, m_scale);
		const float halfWidth = m_statusRect.Width * 0.5f;

		std::wstring leftText;
		if (!m_dataSet.Empty())
		{
			const TabConfig& tab = ActiveTab();
			leftText = std::to_wstring(m_dataSet.FileCount()) + L" 个文件 · " +
			           FormatCount(static_cast<unsigned long long>(m_dataSet.SignalCount())) + L" 条信号 · " +
			           std::to_wstring(tab.VisibleCount()) + L" 条已选 · " +
			           std::to_wstring(tab.Lanes().size()) + L" 个网格";
		}
		else
		{
			leftText = L"未加载数据 · 请点击「打开 CSV」或拖拽文件到窗口";
		}

		UiText(g, UiEllipsize(g, leftText, m_fonts.uiSmall, halfWidth - padding * 2.0f), m_fonts.uiSmall,
		       gd::RectF(m_statusRect.X + padding, m_statusRect.Y, halfWidth - padding, m_statusRect.Height),
		       m_theme.text, TextAlign::LEFT);

		std::wstring rightText = kStatusHint;
		std::uint32_t rightColor = m_theme.textMuted;
		if (!m_statusMessage.empty())
		{
			rightText = m_statusMessage;
			rightColor = m_statusIsError ? m_theme.danger : m_theme.textStrong;
		}
		else if (m_plot.CursorEnabled() && !m_dataSet.Empty())
		{
			rightText = L"光标 · " + FormatValue(m_plot.CursorTime());
			rightColor = m_theme.text;
		}

		UiText(g, UiEllipsize(g, rightText, m_fonts.uiSmall, halfWidth - padding * 2.0f), m_fonts.uiSmall,
		       gd::RectF(m_statusRect.X + halfWidth, m_statusRect.Y, halfWidth - padding, m_statusRect.Height),
		       rightColor, TextAlign::RIGHT);
	}

	void Application::SetStatusMessage(const std::wstring& text, bool isError)
	{
		m_statusMessage = text;
		m_statusIsError = isError;
	}

	void Application::UpdateWindowTitle()
	{
		std::wstring title = kWindowTitle;
		if (m_activeTab >= 0 && m_activeTab < static_cast<int>(m_tabs.size()))
		{
			title += L" — ";
			title += m_tabs[static_cast<std::size_t>(m_activeTab)].Name();
		}
		if (!m_dataSet.Empty())
		{
			title += L"（" + std::to_wstring(m_dataSet.FileCount()) + L" 个文件）";
		}
		SetWindowTextW(m_hwnd, title.c_str());
	}

	void Application::OpenFileDialog()
	{
		// 允许一次选择多个文件，便于跨文件对比信号。
		std::vector<wchar_t> buffer(static_cast<std::size_t>(MAX_PATH) * 16, L'\0');

		OPENFILENAMEW dialog = {};
		dialog.lStructSize = sizeof(dialog);
		dialog.hwndOwner = m_hwnd;
		dialog.lpstrFilter = L"CSV 数据文件 (*.csv)\0*.csv\0文本数据文件 (*.txt)\0*.txt\0所有文件 (*.*)\0*.*\0\0";
		dialog.lpstrFile = buffer.data();
		dialog.nMaxFile = static_cast<DWORD>(buffer.size());
		dialog.lpstrTitle = L"打开仿真数据文件（可多选）";
		dialog.lpstrDefExt = L"csv";
		dialog.Flags = OFN_FILEMUSTEXIST | OFN_PATHMUSTEXIST | OFN_EXPLORER | OFN_NOCHANGEDIR |
		               OFN_ALLOWMULTISELECT;

		if (GetOpenFileNameW(&dialog) == FALSE)
		{
			return;
		}

		// 多选时首段为目录，其余为文件名；单选时整段即为完整路径。
		const std::wstring first(buffer.data());
		const wchar_t* cursor = buffer.data() + first.size() + 1;

		int loaded = 0;
		if (*cursor == L'\0')
		{
			if (LoadFile(first))
			{
				++loaded;
			}
		}
		else
		{
			while (*cursor != L'\0')
			{
				const std::wstring name(cursor);
				if (LoadFile(first + L"\\" + name))
				{
					++loaded;
				}
				cursor += name.size() + 1;
			}
		}

		if (loaded > 0)
		{
			SetStatusMessage(L"已加载 " + std::to_wstring(loaded) +
			                     L" 个文件，请在左侧勾选需要查看的信号。",
			                 false);
		}
	}

	bool Application::LoadFile(const std::wstring& path)
	{
		if (path.empty())
		{
			return false;
		}

		// 同一文件允许多次加载：每次都会新建一个独立分组，各自持有独立的采样数据副本，
		// 因此后续对原始文件的修改或删除都不会影响已加载内容。
		CsvTable table;
		std::wstring error;
		if (!LoadCsvTable(path, table, error))
		{
			SetStatusMessage(L"解析失败：" + error, true);
			InvalidateRect(m_hwnd, nullptr, FALSE);
			return false;
		}

		int fileIndex = -1;
		if (!m_dataSet.AddFromTable(table, path, error, fileIndex))
		{
			SetStatusMessage(L"解析失败：" + error, true);
			InvalidateRect(m_hwnd, nullptr, FALSE);
			return false;
		}

		// 新文件的信号在全部标签页中默认均为未勾选状态，由用户自行决定查看内容。
		SyncTabsToDataSet();
		UpdateWindowTitle();

		const DataFile* file = m_dataSet.FileAt(fileIndex);
		if (file != nullptr)
		{
			std::wstring message = L"已加载 组" + std::to_wstring(fileIndex + 1) + L"｜" + file->fileName +
			                       L"（" + FormatCount(static_cast<unsigned long long>(file->time.size())) +
			                       L" 行采样，" + std::to_wstring(file->signals.size()) +
			                       L" 条信号，时间列：" + file->timeColumnName + L"）";
			if (!file->timeMonotonic)
			{
				message += L" 提示：时间列非单调递增，光标取值使用最近邻策略。";
			}
			SetStatusMessage(message, false);
		}
		return true;
	}

	void Application::LoadCommandLineFiles()
	{
		int argumentCount = 0;
		LPWSTR* arguments = CommandLineToArgvW(GetCommandLineW(), &argumentCount);
		if (arguments == nullptr)
		{
			return;
		}

		int loaded = 0;
		for (int index = 1; index < argumentCount; ++index)
		{
			const std::wstring argument = arguments[index];
			if (argument.empty() || argument[0] == L'-' || argument[0] == L'/')
			{
				continue;
			}
			if (LoadFile(argument))
			{
				++loaded;
			}
		}
		LocalFree(arguments);

		if (loaded > 0)
		{
			SetStatusMessage(L"已加载 " + std::to_wstring(loaded) +
			                     L" 个文件，请在左侧勾选需要查看的信号。",
			                 false);
		}
	}

	void Application::ExecuteToolbarAction(ToolbarAction action)
	{
		switch (action)
		{
		case ToolbarAction::OPEN_FILE:
			OpenFileDialog();
			break;
		case ToolbarAction::FIT_ALL:
			// 自适应同时回到初始状态：退出缩放模式并显示全部信号范围。
			m_plot.FitAll();
			SetStatusMessage(L"已恢复自适应视图。", false);
			break;
		case ToolbarAction::ZOOM_TIME:
			if (m_plot.ToggleZoomMode(PlotZoomMode::TIME))
			{
				SetStatusMessage((m_plot.CurrentZoomMode() == PlotZoomMode::TIME)
				                    ? L"时间轴缩放：在绘图区横向拖拽选择区间即可放大。"
				                    : L"已退出时间轴缩放模式。",
				                false);
			}
			break;
		case ToolbarAction::ZOOM_VALUE:
			if (m_plot.ToggleZoomMode(PlotZoomMode::VALUE))
			{
				SetStatusMessage((m_plot.CurrentZoomMode() == PlotZoomMode::VALUE)
				                    ? L"Y 轴缩放：在某个网格内纵向拖拽选择区间即可放大。"
				                    : L"已退出 Y 轴缩放模式。",
				                false);
			}
			break;
		case ToolbarAction::CURSOR:
			if (m_plot.ToggleCursor())
			{
				SetStatusMessage(m_plot.CursorEnabled()
				                    ? L"时间光标已启用：拖动竖线移动，双击竖线可输入精确时间。"
				                    : L"时间光标已关闭。",
				                false);
			}
			break;
		case ToolbarAction::MERGE_LANES:
			if (!m_dataSet.Empty())
			{
				ActiveTab().SetMode(m_dataSet, LaneMode::MERGED);
				SetStatusMessage(L"已将当前标签页的全部可见信号合并到同一网格。", false);
			}
			break;
		case ToolbarAction::SPLIT_LANES:
			if (!m_dataSet.Empty())
			{
				ActiveTab().SetMode(m_dataSet, LaneMode::PER_SIGNAL);
				SetStatusMessage(L"当前标签页已切换为「每信号一格」。", false);
			}
			break;
		case ToolbarAction::SELECT_ALL:
			if (!m_dataSet.Empty())
			{
				ActiveTab().SetAllVisible(m_dataSet, true);
				m_panel.InvalidateRows();
				SetStatusMessage(L"已勾选当前标签页全部信号。", false);
			}
			break;
		case ToolbarAction::CLEAR_ALL:
			if (!m_dataSet.Empty())
			{
				ActiveTab().SetAllVisible(m_dataSet, false);
				m_panel.InvalidateRows();
				SetStatusMessage(L"已清空当前标签页的信号勾选。", false);
			}
			break;
		case ToolbarAction::NONE:
		default:
			break;
		}

		if (m_hwnd != nullptr)
		{
			InvalidateRect(m_hwnd, nullptr, TRUE);
		}
	}

	bool Application::HandleKeyDown(WPARAM key)
	{
		const bool control = (GetKeyState(VK_CONTROL) & 0x8000) != 0;

		if (control && key == L'O')
		{
			OpenFileDialog();
			return true;
		}
		if (control && key == L'T')
		{
			NewTab();
			return true;
		}
		if (control && key == L'W')
		{
			CloseTab(m_activeTab);
			return true;
		}
		if (control && key == VK_TAB)
		{
			if (m_tabs.size() > 1)
			{
				const bool backward = (GetKeyState(VK_SHIFT) & 0x8000) != 0;
				const int count = static_cast<int>(m_tabs.size());
				SetActiveTab((m_activeTab + (backward ? count - 1 : 1)) % count);
			}
			return true;
		}

		switch (key)
		{
		case VK_ESCAPE:
			m_plot.DisableCursor();
			return true;
		case VK_ADD:
		case VK_OEM_PLUS:
			m_plot.ZoomTimeStep(1.4);
			return true;
		case VK_SUBTRACT:
		case VK_OEM_MINUS:
			m_plot.ZoomTimeStep(1.0 / 1.4);
			return true;
		case VK_LEFT:
			m_plot.PanTimeByFraction(-0.12);
			return true;
		case VK_RIGHT:
			m_plot.PanTimeByFraction(0.12);
			return true;
		case VK_UP:
			m_plot.ScrollLanesByFraction(-0.12);
			return true;
		case VK_DOWN:
			m_plot.ScrollLanesByFraction(0.12);
			return true;
		default:
			break;
		}

		if (key == L'F')
		{
			m_plot.FitAll();
			return true;
		}
		return false;
	}

	bool Application::HandleMouseMove(int x, int y, bool buttonDown)
	{
		if (buttonDown && m_activeTarget != Target::NONE)
		{
			switch (m_activeTarget)
			{
			case Target::SPLITTER:
				if (m_draggingSplitter && m_scale > 0.0f)
				{
					const float desired = static_cast<float>(x - m_splitterGrabOffset) / m_scale;
					const float maximum =
					    std::min(kMaxPanelWidth, static_cast<float>(kMinClientWidth) / m_scale);
					m_panelWidth = std::max(kMinPanelWidth, std::min(desired, maximum));
					Relayout();
					return true;
				}
				return false;
			case Target::PLOT:
				return m_plot.OnMouseMove(x, y);
			case Target::PANEL:
				return m_panel.OnMouseMove(x, y);
			case Target::TOOLBAR:
				return m_toolbar.OnMouseMove(x, y);
			case Target::TAB_BAR:
				return m_tabBar.OnMouseMove(x, y);
			case Target::NONE:
			default:
				return false;
			}
		}

		bool changed = false;
		changed =
		    (m_tabBar.HitTest(x, y) ? m_tabBar.OnMouseMove(x, y) : m_tabBar.OnMouseLeave()) || changed;
		changed =
		    (m_toolbar.HitTest(x, y) ? m_toolbar.OnMouseMove(x, y) : m_toolbar.OnMouseLeave()) || changed;
		changed = (m_panel.HitTest(x, y) ? m_panel.OnMouseMove(x, y) : m_panel.OnMouseLeave()) || changed;
		changed = (m_plot.HitTest(x, y) ? m_plot.OnMouseMove(x, y) : m_plot.OnMouseLeave()) || changed;
		return changed;
	}

	void Application::OnTabBarResult(const TabBarResult& result)
	{
		switch (result.type)
		{
		case TabBarResult::Type::ADD:
			NewTab();
			break;
		case TabBarResult::Type::SELECT:
			if (result.index != m_activeTab)
			{
				SetActiveTab(result.index);
			}
			break;
		case TabBarResult::Type::CLOSE:
			CloseTab(result.index);
			break;
		case TabBarResult::Type::CONTEXT:
			ShowTabContextMenu(result);
			break;
		case TabBarResult::Type::NONE:
		default:
			break;
		}
	}

	void Application::ShowTabContextMenu(const TabBarResult& result)
	{
		if (result.index < 0 || result.index >= static_cast<int>(m_tabs.size()))
		{
			return;
		}

		m_tabMenuIndex = result.index;

		std::vector<MenuItem> items;

		MenuItem header;
		header.kind = MenuItemKind::HEADER;
		header.label = m_tabs[static_cast<std::size_t>(result.index)].Name();
		items.push_back(header);

		MenuItem create;
		create.label = L"新建标签页";
		create.id = kMenuTabNew;
		items.push_back(create);

		MenuItem close;
		close.label = L"关闭该标签页";
		close.id = kMenuTabClose;
		close.enabled = (m_tabs.size() > 1);
		items.push_back(close);

		MenuItem closeOthers;
		closeOthers.label = L"关闭其它标签页";
		closeOthers.id = kMenuTabCloseOthers;
		closeOthers.enabled = (m_tabs.size() > 1);
		items.push_back(closeOthers);

		// 菜单绘制在客户区内，因此把屏幕坐标换算为客户区坐标。
		POINT anchor = {result.screenX, result.screenY};
		ScreenToClient(m_hwnd, &anchor);

		RECT client = {};
		GetClientRect(m_hwnd, &client);
		const gd::RectF bounds(0.0f, 0.0f, static_cast<float>(client.right - client.left),
		                       static_cast<float>(client.bottom - client.top));

		m_menu.Open(MenuScope::TAB_BAR, bounds, anchor.x, anchor.y, items);
	}

	void Application::DispatchMenuResult(const MenuResult& result)
	{
		if (!result.valid)
		{
			return;
		}

		switch (result.scope)
		{
		case MenuScope::SIGNAL_PANEL:
		{
			const bool needRelayout = m_panel.OnMenuCommand(result);
			if (needRelayout)
			{
				Relayout();
			}
			InvalidateRect(m_hwnd, nullptr, FALSE);
			break;
		}
		case MenuScope::TAB_BAR:
		{
			const int index = m_tabMenuIndex;
			if (result.id == kMenuTabNew)
			{
				NewTab();
			}
			else if (result.id == kMenuTabClose)
			{
				CloseTab(index);
			}
			else if (result.id == kMenuTabCloseOthers)
			{
				if (index >= 0 && index < static_cast<int>(m_tabs.size()) && m_tabs.size() > 1)
				{
					const TabConfig keep = m_tabs[static_cast<std::size_t>(index)];
					m_tabs.clear();
					m_tabs.push_back(keep);
					SetActiveTab(0);
				}
			}
			m_tabMenuIndex = -1;
			InvalidateRect(m_hwnd, nullptr, TRUE);
			break;
		}
		case MenuScope::NONE:
		default:
			break;
		}
	}

	LRESULT Application::HandleMessage(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
	{
		// 菜单打开时优先消费鼠标与键盘事件，形成模态交互。
		if (m_menu.IsOpen())
		{
			// 菜单接管输入后，取消底层组件可能仍在进行的拖拽。
			if (m_activeTarget != Target::NONE || m_draggingSplitter)
			{
				ReleaseCapture();
				m_activeTarget = Target::NONE;
				m_draggingSplitter = false;
				m_panel.OnLButtonUp(0, 0);
				m_plot.OnLButtonUp(0, 0);
			}

			switch (message)
			{
			case WM_MOUSEMOVE:
				if (m_menu.OnMouseMove(GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam)))
				{
					InvalidateRect(hwnd, nullptr, FALSE);
				}
				return 0;
			case WM_LBUTTONDOWN:
			{
				MenuResult result;
				m_menu.OnLButtonDown(GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam), result);
				InvalidateRect(hwnd, nullptr, FALSE);
				return 0;
			}
			case WM_LBUTTONUP:
			{
				MenuResult result;
				m_menu.OnLButtonUp(GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam), result);
				InvalidateRect(hwnd, nullptr, FALSE);
				DispatchMenuResult(result);
				return 0;
			}
			case WM_RBUTTONDOWN:
			case WM_MBUTTONDOWN:
			case WM_MOUSEWHEEL:
				m_menu.Close();
				InvalidateRect(hwnd, nullptr, FALSE);
				return 0;
			case WM_KEYDOWN:
			{
				MenuResult result;
				m_menu.OnKeyDown(wParam, result);
				InvalidateRect(hwnd, nullptr, FALSE);
				if (result.valid)
				{
					DispatchMenuResult(result);
				}
				return 0;
			}
			case WM_KILLFOCUS:
			case WM_CANCELMODE:
				m_menu.Close();
				InvalidateRect(hwnd, nullptr, FALSE);
				return 0;
			case WM_SETCURSOR:
				SetCursor(LoadCursorW(nullptr, IDC_ARROW));
				return TRUE;
			default:
				break;
			}
		}

		// 拾色器打开时接管鼠标与键盘（优先级低于弹出菜单、高于常规组件）。
		if (m_colorPicker.IsOpen())
		{
			bool repaint = false;
			bool consume = false;

			switch (message)
			{
			case WM_MOUSEMOVE:
				repaint = m_colorPicker.OnMouseMove(GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam));
				consume = true;
				break;
			case WM_LBUTTONDOWN:
			{
				const int pickX = GET_X_LPARAM(lParam);
				const int pickY = GET_Y_LPARAM(lParam);

				// 拾色器接管输入后，取消底层组件可能仍在进行的拖拽。
				m_panel.OnLButtonUp(0, 0);
				m_plot.OnLButtonUp(0, 0);
				m_activeTarget = Target::NONE;
				m_draggingSplitter = false;

				if (m_colorPicker.ContainsPoint(pickX, pickY))
				{
					// 面板内部：开始拖动滑块，并吃掉本次点击，避免穿透到下方图层。
					m_colorPicker.OnLButtonDown(pickX, pickY);
					SetCapture(hwnd);
					consume = true;
				}
				else
				{
					// 面板外部：收起面板；若落点在信号面板内则放行本次点击，
					// 便于用户在展开状态下直接改选预设色、样式或拖动滑块。
					m_colorPicker.Close();
					if (!m_panel.HitTest(pickX, pickY))
					{
						InvalidateRect(hwnd, nullptr, FALSE);
						return 0;
					}
				}
				repaint = true;
				break;
			}
			case WM_SETCURSOR:
			{
				if (LOWORD(lParam) == HTCLIENT)
				{
					POINT point = {};
					GetCursorPos(&point);
					ScreenToClient(hwnd, &point);

					HCURSOR cursor = m_colorPicker.QueryCursor(point.x, point.y);
					SetCursor(cursor != nullptr ? cursor : LoadCursorW(nullptr, IDC_ARROW));
					return TRUE;
				}
				break;
			}
			case WM_LBUTTONUP:
				m_colorPicker.OnLButtonUp();
				ReleaseCapture();
				repaint = true;
				consume = true;
				break;
			case WM_KEYDOWN:
				m_colorPicker.OnKeyDown(wParam);
				repaint = true;
				consume = true;
				break;
			case WM_RBUTTONDOWN:
			case WM_MBUTTONDOWN:
			case WM_MOUSEWHEEL:
				m_colorPicker.Close();
				repaint = true;
				consume = true;
				break;
			default:
				break;
			}

			// 取色变化实时应用到当前选中信号。
			std::uint32_t pickedColor = 0;
			if (m_colorPicker.TakeChanged(pickedColor))
			{
				m_panel.ApplyColor(pickedColor);
				repaint = true;
			}

			if (repaint)
			{
				InvalidateRect(hwnd, nullptr, FALSE);
			}
			if (consume)
			{
				return 0;
			}
		}

		switch (message)
		{
		case WM_SIZE:
		{
			ReleaseBackBuffer();
			Relayout();
			InvalidateRect(hwnd, nullptr, FALSE);
			return 0;
		}
		case WM_GETMINMAXINFO:
		{
			MINMAXINFO* info = reinterpret_cast<MINMAXINFO*>(lParam);
			info->ptMinTrackSize.x = static_cast<LONG>(ScaleOf(static_cast<float>(kMinClientWidth), m_scale));
			info->ptMinTrackSize.y = static_cast<LONG>(ScaleOf(static_cast<float>(kMinClientHeight), m_scale));
			return 0;
		}
		case WM_DPICHANGED:
		{
			const UINT dpi = HIWORD(wParam);
			const RECT* suggested = reinterpret_cast<const RECT*>(lParam);
			if (suggested != nullptr)
			{
				SetWindowPos(hwnd, nullptr, suggested->left, suggested->top,
				             suggested->right - suggested->left, suggested->bottom - suggested->top,
				             SWP_NOZORDER | SWP_NOACTIVATE);
			}
			ApplyDpi(dpi);
			InvalidateRect(hwnd, nullptr, FALSE);
			return 0;
		}
		case WM_ERASEBKGND:
			return 1;
		case WM_PAINT:
		{
			PAINTSTRUCT paintStruct = {};
			BeginPaint(hwnd, &paintStruct);
			Render();
			EndPaint(hwnd, &paintStruct);
			return 0;
		}
		case WM_MOUSEMOVE:
		{
			if (!m_trackingLeave)
			{
				TRACKMOUSEEVENT track = {};
				track.cbSize = sizeof(track);
				track.dwFlags = TME_LEAVE;
				track.hwndTrack = hwnd;
				TrackMouseEvent(&track);
				m_trackingLeave = true;
			}

			const int x = GET_X_LPARAM(lParam);
			const int y = GET_Y_LPARAM(lParam);
			const bool buttonDown = (wParam & (MK_LBUTTON | MK_RBUTTON)) != 0;
			if (HandleMouseMove(x, y, buttonDown))
			{
				InvalidateRect(hwnd, nullptr, FALSE);
			}
			return 0;
		}
		case WM_MOUSELEAVE:
		{
			m_trackingLeave = false;
			bool changed = m_tabBar.OnMouseLeave();
			changed = m_toolbar.OnMouseLeave() || changed;
			changed = m_panel.OnMouseLeave() || changed;
			changed = m_plot.OnMouseLeave() || changed;
			if (changed)
			{
				InvalidateRect(hwnd, nullptr, FALSE);
			}
			return 0;
		}
		case WM_LBUTTONDOWN:
		{
			SetFocus(hwnd);
			const int x = GET_X_LPARAM(lParam);
			const int y = GET_Y_LPARAM(lParam);

			// 时间光标处于精确输入态时，点击绘图区之外视为提交（与线宽输入一致）。
			if (m_plot.IsEditingCursor() && !m_plot.HitTest(x, y))
			{
				m_plot.OnEditKey(VK_RETURN);
			}

			// 点击面板之外的位置时收起面板内展开的自定义颜色面板。
			if (!m_panel.HitTest(x, y))
			{
				if (m_panel.CloseTransientUi())
				{
					InvalidateRect(hwnd, nullptr, FALSE);
				}
			}

			if (UiPointInRect(m_splitterRect, static_cast<float>(x), static_cast<float>(y)))
			{
				SetCapture(hwnd);
				m_draggingSplitter = true;
				m_activeTarget = Target::SPLITTER;
				m_splitterGrabOffset = x - static_cast<int>(m_splitterRect.X);
				return 0;
			}

			if (m_tabBar.HitTest(x, y))
			{
				SetCapture(hwnd);
				m_activeTarget = Target::TAB_BAR;
				m_tabBar.OnLButtonDown(x, y);
				InvalidateRect(hwnd, nullptr, FALSE);
				return 0;
			}

			if (m_toolbar.HitTest(x, y))
			{
				SetCapture(hwnd);
				m_activeTarget = Target::TOOLBAR;
				ToolbarAction action = ToolbarAction::NONE;
				m_toolbar.OnLButtonDown(x, y, action);
				InvalidateRect(hwnd, nullptr, FALSE);
				return 0;
			}

			if (m_panel.HitTest(x, y))
			{
				SetCapture(hwnd);
				m_activeTarget = Target::PANEL;
				if (m_panel.OnLButtonDown(x, y))
				{
					InvalidateRect(hwnd, nullptr, TRUE);
				}
				return 0;
			}

			if (m_plot.HitTest(x, y))
			{
				SetCapture(hwnd);
				m_activeTarget = Target::PLOT;
				if (m_plot.OnLButtonDown(x, y))
				{
					InvalidateRect(hwnd, nullptr, FALSE);
				}
				return 0;
			}

			m_activeTarget = Target::NONE;
			return 0;
		}
		case WM_LBUTTONUP:
		{
			const int x = GET_X_LPARAM(lParam);
			const int y = GET_Y_LPARAM(lParam);
			ReleaseCapture();

			switch (m_activeTarget)
			{
			case Target::SPLITTER:
				m_draggingSplitter = false;
				break;
			case Target::TAB_BAR:
			{
				TabBarResult result;
				m_tabBar.OnLButtonUp(x, y, result);
				m_activeTarget = Target::NONE;
				OnTabBarResult(result);
				InvalidateRect(hwnd, nullptr, FALSE);
				return 0;
			}
			case Target::TOOLBAR:
			{
				ToolbarAction action = ToolbarAction::NONE;
				m_toolbar.OnLButtonUp(x, y, action);
				m_activeTarget = Target::NONE;
				if (action != ToolbarAction::NONE)
				{
					ExecuteToolbarAction(action);
					return 0;
				}
				break;
			}
			case Target::PANEL:
				m_panel.OnLButtonUp(x, y);
				break;
			case Target::PLOT:
				m_plot.OnLButtonUp(x, y);
				break;
			case Target::NONE:
			default:
				break;
			}

			m_activeTarget = Target::NONE;
			InvalidateRect(hwnd, nullptr, TRUE);
			return 0;
		}
		case WM_LBUTTONDBLCLK:
		{
			const int x = GET_X_LPARAM(lParam);
			const int y = GET_Y_LPARAM(lParam);
			bool changed = false;
			if (m_panel.HitTest(x, y))
			{
				changed = m_panel.OnDoubleClick(x, y);
			}
			else if (m_plot.HitTest(x, y))
			{
				changed = m_plot.OnDoubleClick(x, y);
			}
			if (changed)
			{
				InvalidateRect(hwnd, nullptr, TRUE);
			}
			return 0;
		}
		case WM_RBUTTONDOWN:
		{
			const int x = GET_X_LPARAM(lParam);
			const int y = GET_Y_LPARAM(lParam);

			POINT cursor = {x, y};
			ClientToScreen(hwnd, &cursor);

			if (m_tabBar.HitTest(x, y))
			{
				TabBarResult result;
				if (m_tabBar.OnRButtonDown(x, y, cursor.x, cursor.y, result))
				{
					OnTabBarResult(result);
					// 自绘菜单会覆盖在客户区之上，必须请求重绘才能显示。
					InvalidateRect(hwnd, nullptr, FALSE);
				}
				return 0;
			}

			if (m_panel.HitTest(x, y))
			{
				SetCapture(hwnd);
				m_activeTarget = Target::PANEL;
				if (m_panel.OnRButtonDown(x, y))
				{
					InvalidateRect(hwnd, nullptr, TRUE);
				}
				ReleaseCapture();
				m_activeTarget = Target::NONE;
				return 0;
			}
			return 0;
		}
		case WM_RBUTTONUP:
		{
			ReleaseCapture();
			m_activeTarget = Target::NONE;
			return 0;
		}
		case WM_MOUSEWHEEL:
		{
			POINT point = {GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam)};
			ScreenToClient(hwnd, &point);

			const int delta = GET_WHEEL_DELTA_WPARAM(wParam);
			const bool shift = (GET_KEYSTATE_WPARAM(wParam) & MK_SHIFT) != 0;

			bool changed = false;
			if (m_panel.HitTest(point.x, point.y))
			{
				changed = m_panel.OnMouseWheel(delta);
			}
			else if (m_plot.HitTest(point.x, point.y))
			{
				changed = m_plot.OnMouseWheel(point.x, point.y, delta, shift);
			}
			if (changed)
			{
				InvalidateRect(hwnd, nullptr, FALSE);
			}
			return 0;
		}
		case WM_SETCURSOR:
		{
			if (LOWORD(lParam) == HTCLIENT)
			{
				POINT point = {};
				GetCursorPos(&point);
				ScreenToClient(hwnd, &point);

				HCURSOR cursor = nullptr;
				if (UiPointInRect(m_splitterRect, static_cast<float>(point.x), static_cast<float>(point.y)))
				{
					cursor = LoadCursorW(nullptr, IDC_SIZEWE);
				}
				else if (m_plot.HitTest(point.x, point.y))
				{
					cursor = m_plot.QueryCursor(point.x, point.y);
				}
				if (cursor == nullptr)
				{
					cursor = LoadCursorW(nullptr, IDC_ARROW);
				}
				SetCursor(cursor);
				return TRUE;
			}
			break;
		}
		case WM_KEYDOWN:
			// 数值输入状态优先接管按键（回车提交、Esc 取消、退格删除）。
			if (m_panel.IsEditingWidth())
			{
				if (m_panel.OnEditKey(wParam))
				{
					InvalidateRect(hwnd, nullptr, FALSE);
				}
				return 0;
			}
			if (m_plot.IsEditingCursor())
			{
				if (m_plot.OnEditKey(wParam))
				{
					InvalidateRect(hwnd, nullptr, FALSE);
				}
				return 0;
			}
			if (HandleKeyDown(wParam))
			{
				InvalidateRect(hwnd, nullptr, TRUE);
				return 0;
			}
			break;
		case WM_CHAR:
		{
			// 数值输入仅接受数字与小数点（或科学计数法符号），其余字符一律吞掉。
			if (m_panel.IsEditingWidth())
			{
				if (m_panel.OnEditChar(static_cast<wchar_t>(wParam)))
				{
					InvalidateRect(hwnd, nullptr, FALSE);
				}
				return 0;
			}
			if (m_plot.IsEditingCursor())
			{
				if (m_plot.OnEditChar(static_cast<wchar_t>(wParam)))
				{
					InvalidateRect(hwnd, nullptr, FALSE);
				}
				return 0;
			}
			break;
		}
		case WM_KILLFOCUS:
			// 失焦时提交输入并收起临时界面，避免失去鼠标前景后控件仍处于编辑态。
			m_panel.CloseTransientUi();
			m_colorPicker.Close();
			m_menu.Close();
			InvalidateRect(hwnd, nullptr, FALSE);
			return 0;
		case kMessageRemoveFile:
		{
			RemoveFile(static_cast<int>(wParam));
			return 0;
		}
		case WM_DROPFILES:
		{
			HDROP drop = reinterpret_cast<HDROP>(wParam);
			const UINT count = DragQueryFileW(drop, 0xFFFFFFFF, nullptr, 0);
			int loaded = 0;
			for (UINT index = 0; index < count; ++index)
			{
				const UINT length = DragQueryFileW(drop, index, nullptr, 0);
				if (length == 0)
				{
					continue;
				}
				std::vector<wchar_t> buffer(static_cast<std::size_t>(length) + 1, L'\0');
				if (DragQueryFileW(drop, index, buffer.data(), length + 1) > 0)
				{
					if (LoadFile(std::wstring(buffer.data())))
					{
						++loaded;
					}
				}
			}
			DragFinish(drop);

			if (loaded > 0)
			{
				SetStatusMessage(L"已加载 " + std::to_wstring(loaded) +
				                     L" 个文件，请在左侧勾选需要查看的信号。",
				                 false);
			}
			return 0;
		}
		case WM_DESTROY:
			PostQuitMessage(0);
			return 0;
		default:
			break;
		}

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

} // namespace jdi