#include "DataModel.hpp"

#include <algorithm>
#include <cmath>
#include <cwctype>
#include <limits>

#include "Theme.hpp"
#include "Utf8Util.hpp"

namespace jdi
{

	namespace
	{
		const double kMissing = std::numeric_limits<double>::quiet_NaN();	/**< 缺失值占位。 */
		const double kDefaultLineWidth = 1.6;								/**< 默认线宽。 */

		/**
		 * @brief 判断列名是否为时间轴候选列。
		 * @param [IN] header 原始列名。
		 * @return 可能为时间轴返回 true。
		 */
		bool LooksLikeTimeHeader(const std::wstring& header)
		{
			const std::wstring text = ToLowerAscii(Trim(header));
			if (text.empty())
			{
				return false;
			}

			if (text == L"t" || text == L"time" || text == L"timestamp" || text == L"simulation time" ||
			    text == L"时间" || text == L"时间轴")
			{
				return true;
			}
			return ContainsInsensitive(text, L"time") || ContainsInsensitive(text, L"时间");
		}

		/**
		 * @brief 从名称末尾的括号中提取单位（仅接受形如 mA / V / deg/s 的短标记）。
		 * @param [IN] text 列名（已去除首尾空白）。
		 * @return 单位文本，无法识别时返回空字符串。
		 */
		std::wstring ExtractUnit(const std::wstring& text)
		{
			if (text.size() < 3 || text.back() != L')')
			{
				return std::wstring();
			}

			const std::size_t open = text.rfind(L'(');
			if (open == std::wstring::npos || open + 2 >= text.size())
			{
				return std::wstring();
			}

			const std::wstring inner = Trim(text.substr(open + 1, text.size() - open - 2));
			if (inner.empty() || inner.size() > 10)
			{
				return std::wstring();
			}

			for (const wchar_t c : inner)
			{
				const bool allowed = iswalpha(c) || iswdigit(c) || c == L'%' || c == L'/' || c == L'^' ||
				                     c == L'-' || c == L'.' || c == L'\u00B0' || c == L'\u00B5' ||
				                     c == L'\u03A9' || c == L'\u00B2' || c == L'\u00B3' || c == L'\u00B7';
				if (!allowed)
				{
					return std::wstring();
				}
			}
			return inner;
		}

		/**
		 * @brief 为网格范围补充留白，避免波形紧贴边界。
		 * @param [IN, OUT] yMin 范围下限。
		 * @param [IN, OUT] yMax 范围上限。
		 */
		void PadRange(double& yMin, double& yMax)
		{
			if (!std::isfinite(yMin) || !std::isfinite(yMax))
			{
				yMin = 0.0;
				yMax = 1.0;
				return;
			}

			const double span = yMax - yMin;
			if (span <= 0.0)
			{
				const double magnitude = std::max(1.0, std::fabs(yMin) * 0.1);
				yMin -= magnitude;
				yMax += magnitude;
				return;
			}

			const double pad = span * 0.06;
			yMin -= pad;
			yMax += pad;
		}

		/**
		 * @brief 依据全部可见信号重新生成网格划分。
		 * @param [IN] visible 各信号的可见性（按 [文件][信号] 索引）。
		 * @param [IN] lanes 网格集合（原地更新）。
		 * @param [IN] mode 网格划分策略。
		 */
		void RebuildLanes(const std::vector<std::vector<bool>>& visible, std::vector<Lane>& lanes,
		                  LaneMode mode)
		{
			// 随网格携带的“网格自身状态”（按信号继承）：重建网格时不能丢。
			struct LaneCarry
			{
				bool fitYToSelection = false;
				bool edgeCount = false;
				double edgeValue = 0.0;
				bool edgeValueValid = false;
				bool edgePanelOpen = true;
				double edgePanelX = -1.0;
				double edgePanelY = -1.0;
				bool edgeCenter = false;
				int edgeCenterSmooth = 5;
				bool edgeCenterPanelOpen = true;
				double edgeCenterPanelX = -1.0;
				double edgeCenterPanelY = -1.0;
				bool meanFilter = false;
				int meanFilterRadius = 5;
				bool meanFilterPanelOpen = true;
				double meanFilterPanelX = -1.0;
				double meanFilterPanelY = -1.0;
			};

			// 先记下每个信号原来所在网格的网格自身状态：
			// 勾选可见性会重建网格，若不携带，用户刚打开的开关会被悄悄清掉。
			std::vector<std::pair<SignalRef, LaneCarry>> previousCarry;
			for (const Lane& lane : lanes)
			{
				LaneCarry carry;
				carry.fitYToSelection = lane.fitYToSelection;
				carry.edgeCount = lane.edgeCount;
				carry.edgeValue = lane.edgeValue;
				carry.edgeValueValid = lane.edgeValueValid;
				carry.edgePanelOpen = lane.edgePanelOpen;
				carry.edgePanelX = lane.edgePanelX;
				carry.edgePanelY = lane.edgePanelY;
				carry.edgeCenter = lane.edgeCenter;
				carry.edgeCenterSmooth = lane.edgeCenterSmooth;
				carry.edgeCenterPanelOpen = lane.edgeCenterPanelOpen;
				carry.edgeCenterPanelX = lane.edgeCenterPanelX;
				carry.edgeCenterPanelY = lane.edgeCenterPanelY;
				carry.meanFilter = lane.meanFilter;
				carry.meanFilterRadius = lane.meanFilterRadius;
				carry.meanFilterPanelOpen = lane.meanFilterPanelOpen;
				carry.meanFilterPanelX = lane.meanFilterPanelX;
				carry.meanFilterPanelY = lane.meanFilterPanelY;
				for (const SignalRef& ref : lane.signals)
				{
					previousCarry.emplace_back(ref, carry);
				}
			}
			const auto inheritedCarry = [&previousCarry](const SignalRef& ref)
			{
				for (const std::pair<SignalRef, LaneCarry>& entry : previousCarry)
				{
					if (entry.first == ref)
					{
						return entry.second;
					}
				}
				return LaneCarry();
			};
			const auto applyCarry = [&inheritedCarry](Lane& lane, const SignalRef& ref)
			{
				const LaneCarry carry = inheritedCarry(ref);
				lane.fitYToSelection = carry.fitYToSelection;
				lane.edgeCount = carry.edgeCount;
				lane.edgeValue = carry.edgeValue;
				lane.edgeValueValid = carry.edgeValueValid;
				lane.edgePanelOpen = carry.edgePanelOpen;
				lane.edgePanelX = carry.edgePanelX;
				lane.edgePanelY = carry.edgePanelY;
				lane.edgeCenter = carry.edgeCenter;
				lane.edgeCenterSmooth = carry.edgeCenterSmooth;
				lane.edgeCenterPanelOpen = carry.edgeCenterPanelOpen;
				lane.edgeCenterPanelX = carry.edgeCenterPanelX;
				lane.edgeCenterPanelY = carry.edgeCenterPanelY;
				lane.meanFilter = carry.meanFilter;
				lane.meanFilterRadius = carry.meanFilterRadius;
				lane.meanFilterPanelOpen = carry.meanFilterPanelOpen;
				lane.meanFilterPanelX = carry.meanFilterPanelX;
				lane.meanFilterPanelY = carry.meanFilterPanelY;
			};

			// 收集全部可见信号引用。
			std::vector<SignalRef> visibleRefs;
			for (std::size_t fileIndex = 0; fileIndex < visible.size(); ++fileIndex)
			{
				for (std::size_t signalIndex = 0; signalIndex < visible[fileIndex].size(); ++signalIndex)
				{
					if (visible[fileIndex][signalIndex])
					{
						SignalRef ref;
						ref.fileIndex = static_cast<int>(fileIndex);
						ref.signalIndex = static_cast<int>(signalIndex);
						visibleRefs.push_back(ref);
					}
				}
			}

			// 判断某引用对应的信号是否可见（越界视为不可见）。
			const auto isVisibleRef = [&visible](const SignalRef& ref)
			{
				if (ref.fileIndex < 0 || static_cast<std::size_t>(ref.fileIndex) >= visible.size())
				{
					return false;
				}
				const std::vector<bool>& fileVisible = visible[static_cast<std::size_t>(ref.fileIndex)];
				if (ref.signalIndex < 0 || static_cast<std::size_t>(ref.signalIndex) >= fileVisible.size())
				{
					return false;
				}
				return fileVisible[static_cast<std::size_t>(ref.signalIndex)];
			};

			// 某信号当前所属的网格下标（-1 表示尚未分配网格）。
			const auto laneIndexOf = [&lanes](const SignalRef& ref)
			{
				for (std::size_t index = 0; index < lanes.size(); ++index)
				{
					const std::vector<SignalRef>& refs = lanes[index].signals;
					if (std::find(refs.begin(), refs.end(), ref) != refs.end())
					{
						return static_cast<int>(index);
					}
				}
				return -1;
			};

			if (mode == LaneMode::PER_SIGNAL)
			{
				// 每条可见信号独占一个网格：网格数量严格跟随可见信号数量。
				// **顺序按"原有网格位置"优先**：已经分配过网格的信号保持其相对次序，
				// 新勾选（此前没有网格）的信号统一追加到最下方。
				// 若直接按 visibleRefs（文件/列序）重建，新勾选的信号会按其列序
				// 插到中间，位置看起来"不确定"。
				std::vector<SignalRef> ordered;
				ordered.reserve(visibleRefs.size());
				for (const SignalRef& ref : visibleRefs)
				{
					if (laneIndexOf(ref) >= 0)
					{
						ordered.push_back(ref);
					}
				}
				std::stable_sort(ordered.begin(), ordered.end(),
				                 [&laneIndexOf](const SignalRef& a, const SignalRef& b)
				                 { return laneIndexOf(a) < laneIndexOf(b); });
				for (const SignalRef& ref : visibleRefs)
				{
					if (laneIndexOf(ref) < 0)
					{
						ordered.push_back(ref);
					}
				}

				lanes.clear();
				lanes.reserve(ordered.size());
				for (const SignalRef& ref : ordered)
				{
					Lane lane;
					lane.autoRange = true;
					applyCarry(lane, ref);
					lane.signals.push_back(ref);
					lanes.push_back(std::move(lane));
				}
			}
			else if (mode == LaneMode::MERGED)
			{
				// 全部可见信号合并到同一网格；无可见信号时不保留空网格。
				bool previousAutoRange = true;
				double previousYMin = -1.0;
				double previousYMax = 1.0;
				if (lanes.size() == 1)
				{
					previousAutoRange = lanes[0].autoRange;
					previousYMin = lanes[0].yMin;
					previousYMax = lanes[0].yMax;
				}

				lanes.clear();
				if (!visibleRefs.empty())
				{
					Lane lane;
					lane.autoRange = previousAutoRange;
					lane.yMin = previousYMin;
					lane.yMax = previousYMax;
					applyCarry(lane, visibleRefs.front());
					lane.signals = visibleRefs;
					lanes.push_back(std::move(lane));
				}
			}
			else
			{
				// 自定义划分：仅移除不可见信号与由此产生的空网格，保持用户排布。
				for (Lane& lane : lanes)
				{
					std::vector<SignalRef>& refs = lane.signals;
					refs.erase(std::remove_if(refs.begin(), refs.end(),
					                          [&isVisibleRef](const SignalRef& ref)
					                          { return !isVisibleRef(ref); }),
					            refs.end());
				}

				lanes.erase(std::remove_if(lanes.begin(), lanes.end(),
				                           [](const Lane& lane) { return lane.signals.empty(); }),
				            lanes.end());

				// 未分配网格的可见信号各自独占一个新网格。
				// 注意：不能把它们塞进已有的第一个网格——那会导致“拖拽合并后新勾选的信号
				// 被悄悄并入合并网格”，用户看不到新增的独立泳道。
				for (const SignalRef& ref : visibleRefs)
				{
					bool placed = false;
					for (const Lane& lane : lanes)
					{
						if (std::find(lane.signals.begin(), lane.signals.end(), ref) != lane.signals.end())
						{
							placed = true;
							break;
						}
					}
					if (placed)
					{
						continue;
					}

					Lane lane;
					lane.autoRange = true;
					applyCarry(lane, ref);
					lane.signals.push_back(ref);
					lanes.push_back(std::move(lane));
				}
			}

			// 统一重命名，保证编号连续。
			for (std::size_t index = 0; index < lanes.size(); ++index)
			{
				lanes[index].name = L"网格 " + std::to_wstring(index + 1);
			}
		}
	}

	const wchar_t* DrawModeName(DrawMode mode)
	{
		switch (mode)
		{
		case DrawMode::LINE:
			return L"线段";
		case DrawMode::SCATTER:
			return L"散点";
		case DrawMode::LINE_SCATTER:
			return L"点线";
		default:
			return L"线段";
		}
	}

	// ============================ DataFile 构建 ============================

	/**
	 * @brief 粗粒度包络层每个分组覆盖的采样数。
	 *
	 * 16KB 的双精度分组可覆盖 1024 个采样（内存开销 = 采样数的 1.6%），
	 * 但会让"每列采样数略多于分组跨度"的场景退化为逐点扫描。
	 * 取 256 时：额外内存约为采样数的 0.8%，最坏情况的扫描量也能压低到
	 * 每列 ≤256 个采样（2400 列 ≈ 0.6M 次读取，约 1ms）。
	 */
	const std::size_t kCoarseStride = 256;

	/**
	 * @brief 单条信号的取值范围统计结果。
	 */
	struct SignalStats
	{
		double minValue = 0.0;		/**< 有限采样值最小值。 */
		double maxValue = 0.0;		/**< 有限采样值最大值。 */
		std::size_t finiteCount = 0;	/**< 有限采样点数量。 */
	};

	/**
	 * @brief 统计一列采样的最小/最大值与有效点数量，并顺带构建粗粒度包络层。
	 *
	 * 两者在同一个循环内完成，避免为粗粒度层多扫一遍数据（大文件下那是一整趟内存遍历）。
	 *
	 * @param [IN] values 采样列。
	 * @param [OUT] coarseMin 粗粒度分组最小值输出。
	 * @param [OUT] coarseMax 粗粒度分组最大值输出。
	 * @return 统计结果。
	 */
	SignalStats ComputeStats(const std::vector<double>& values, std::vector<double>& coarseMin,
	                         std::vector<double>& coarseMax)
	{
		SignalStats stats;
		double low = std::numeric_limits<double>::infinity();
		double high = -std::numeric_limits<double>::infinity();

		const std::size_t count = values.size();
		const std::size_t buckets = (count + kCoarseStride - 1) / kCoarseStride;
		coarseMin.assign(buckets, std::numeric_limits<double>::infinity());
		coarseMax.assign(buckets, -std::numeric_limits<double>::infinity());

		std::size_t bucket = 0;
		std::size_t bucketEnd = kCoarseStride;
		for (std::size_t index = 0; index < count; ++index)
		{
			if (index >= bucketEnd)
			{
				++bucket;
				bucketEnd += kCoarseStride;
			}
			const double value = values[index];
			if (std::isfinite(value))
			{
				++stats.finiteCount;
				low = std::min(low, value);
				high = std::max(high, value);
				if (value < coarseMin[bucket])
				{
					coarseMin[bucket] = value;
				}
				if (value > coarseMax[bucket])
				{
					coarseMax[bucket] = value;
				}
			}
		}

		if (stats.finiteCount == 0)
		{
			stats.minValue = 0.0;
			stats.maxValue = 0.0;
		}
		else
		{
			stats.minValue = low;
			stats.maxValue = high;
		}
		return stats;
	}

	bool BuildDataFile(CsvTable&& table, const std::wstring& filePath, std::size_t paletteBase, DataFile& file,
	                   std::wstring& error, const CsvProgress& progress)
	{
		error.clear();
		file = DataFile();

		if (!table.HasData())
		{
			error = L"数据表为空。";
			return false;
		}

		const std::size_t columnCount = table.headers.size();
		if (table.columns.size() < columnCount)
		{
			error = L"数据表列结构不完整。";
			return false;
		}

		// 1. 识别时间轴列：优先取列名匹配的列，否则回退到第一列。
		int timeColumn = -1;
		for (std::size_t column = 0; column < columnCount; ++column)
		{
			if (LooksLikeTimeHeader(table.headers[column]))
			{
				timeColumn = static_cast<int>(column);
				break;
			}
		}
		if (timeColumn < 0)
		{
			timeColumn = 0;
		}

		// 时间列整列移动，不做逐元素拷贝。
		file.time = std::move(table.columns[static_cast<std::size_t>(timeColumn)]);

		std::size_t finiteTimeCount = 0;
		bool monotonic = true;
		double previousTime = 0.0;
		bool hasPrevious = false;
		for (const double value : file.time)
		{
			if (std::isfinite(value))
			{
				++finiteTimeCount;
				if (hasPrevious && value < previousTime)
				{
					monotonic = false;
				}
				previousTime = value;
				hasPrevious = true;
			}
		}

		if (finiteTimeCount < 2)
		{
			error = L"时间轴列（" + table.headers[static_cast<std::size_t>(timeColumn)] + L"）有效数值不足。";
			return false;
		}

		file.timeColumnName = table.headers[static_cast<std::size_t>(timeColumn)];
		file.timeMonotonic = monotonic;
		file.filePath = filePath;

		const std::size_t slashPos = filePath.find_last_of(L"\\/");
		file.fileName = (slashPos == std::wstring::npos) ? filePath : filePath.substr(slashPos + 1);

		// 2. 构建信号列：每列整块移动，随后就地统计取值范围。
		int paletteCount = 0;
		const std::uint32_t* palette = SignalPalette(paletteCount);
		file.signals.reserve(columnCount);
		for (std::size_t column = 0; column < columnCount; ++column)
		{
			if (static_cast<int>(column) == timeColumn)
			{
				continue;
			}

			SignalData signal;
			signal.rawHeader = table.headers[column];
			{
				// 名称完整保留文件内的列名（含 "[n]" 序号与括号描述），仅用于展示不做改写。
				signal.name = Trim(signal.rawHeader);
				signal.unit = ExtractUnit(signal.name);
			}

			signal.values = std::move(table.columns[column]);
			const SignalStats stats = ComputeStats(signal.values, signal.coarseMin, signal.coarseMax);
			signal.coarseStride = kCoarseStride;
			signal.minValue = stats.minValue;
			signal.maxValue = stats.maxValue;
			signal.finiteCount = stats.finiteCount;

			// 显示外观随信号一起初始化：调色板按「全局信号序号」取色，
			// 使同一信号在任意标签页中都保持同一默认颜色。
			{
				const std::size_t globalIndex = paletteBase + file.signals.size();
				if (palette != nullptr && paletteCount > 0)
				{
					const std::size_t count = static_cast<std::size_t>(paletteCount);
					const std::size_t slot = globalIndex % count;
					signal.style.color = palette[slot];
					// 自定义色初值取调色板中「向后递进」的下一个颜色。
					// 若初值等于本信号自身的预设色，样式区里点击该预设色块会被判定成
					// “当前用的是自定义色”，高亮会直接跳到自定义色块上（此前的缺陷）。
					signal.style.customColor = palette[(slot + 1) % count];
				}
				else
				{
					signal.style.color = 0xFF268BD2u;
					signal.style.customColor = 0xFF859900u;
				}
				signal.style.opacity = 1.0f;
				signal.style.lineWidth = 1.0f;
				signal.style.mode = DrawMode::LINE;
			}

			file.signals.push_back(std::move(signal));

			if (progress && !progress(0.75 + 0.25 * static_cast<double>(column + 1) /
			                                     static_cast<double>(columnCount)))
			{
				error = L"已取消加载。";
				return false;
			}
		}

		if (file.signals.empty())
		{
			error = L"除时间轴外未发现任何数据列。";
			return false;
		}

		// 3. 统计时间范围（时间列为空或全部无效时回退到行数上界）。
		double tMin = std::numeric_limits<double>::infinity();
		double tMax = -std::numeric_limits<double>::infinity();
		for (const double value : file.time)
		{
			if (std::isfinite(value))
			{
				tMin = std::min(tMin, value);
				tMax = std::max(tMax, value);
			}
		}
		file.minTime = tMin;
		file.maxTime = tMax;
		return true;
	}

	// ============================ DataSet ============================

	bool DataSet::AddDataFile(DataFile&& file, int& fileIndex)
	{
		fileIndex = -1;
		if (file.signals.empty())
		{
			return false;
		}
		m_files.push_back(std::move(file));
		fileIndex = static_cast<int>(m_files.size()) - 1;
		return true;
	}

	bool DataSet::InsertDerivedSignal(int fileIndex, int afterSignalIndex, SignalData&& signal,
	                                  int& newSignalIndex)
	{
		newSignalIndex = -1;
		if (fileIndex < 0 || fileIndex >= static_cast<int>(m_files.size()))
		{
			return false;
		}

		DataFile& file = m_files[static_cast<std::size_t>(fileIndex)];
		if (afterSignalIndex < -1 || afterSignalIndex >= static_cast<int>(file.signals.size()))
		{
			return false;
		}

		// 1. 采样值统计与粗粒度包络层：与正常加载路径使用同一套统计逻辑，
		//    否则派生信号在大文件下会退化成逐点扫描（包络构建变慢）。
		const SignalStats stats = ComputeStats(signal.values, signal.coarseMin, signal.coarseMax);
		signal.coarseStride = kCoarseStride;
		signal.minValue = stats.minValue;
		signal.maxValue = stats.maxValue;
		signal.finiteCount = stats.finiteCount;

		// 2. 显示外观按「全局信号序号」取调色板颜色（与普通新信号完全一致的规则）。
		const int insertPos = afterSignalIndex + 1;
		{
			// 新信号的全局序号 = 本文件之前的信号总数 + 它在文件内的下标。
			std::size_t globalIndex = static_cast<std::size_t>(insertPos);
			for (int index = 0; index < fileIndex; ++index)
			{
				globalIndex += m_files[static_cast<std::size_t>(index)].signals.size();
			}

			int paletteCount = 0;
			const std::uint32_t* palette = SignalPalette(paletteCount);
			if (palette != nullptr && paletteCount > 0)
			{
				const std::size_t count = static_cast<std::size_t>(paletteCount);
				const std::size_t slot = globalIndex % count;
				signal.style.color = palette[slot];
				signal.style.customColor = palette[(slot + 1) % count];
			}
		}

		file.signals.insert(file.signals.begin() + insertPos, std::move(signal));

		// 3. 全局选中引用：同一文件内位于插入点之后的信号下标整体后移。
		if (m_selected.fileIndex == fileIndex && m_selected.signalIndex >= insertPos)
		{
			++m_selected.signalIndex;
		}

		newSignalIndex = insertPos;
		return true;
	}

	bool DataSet::RemoveFile(int fileIndex)
	{
		if (fileIndex < 0 || fileIndex >= static_cast<int>(m_files.size()))
		{
			return false;
		}

		// 用移动到末位后弹出的方式移除，使被移除文件的时间轴与全部信号缓冲区在本调用内
		// 立即析构归还操作系统，不再等待后续插入覆盖；最后收缩容量，避免残留空闲块。
		const std::size_t position = static_cast<std::size_t>(fileIndex);
		for (std::size_t index = position; index + 1 < m_files.size(); ++index)
		{
			m_files[index] = std::move(m_files[index + 1]);
		}
		m_files.pop_back();
		m_files.shrink_to_fit();
		return true;
	}

	bool DataSet::RemoveSignal(int fileIndex, int signalIndex)
	{
		if (fileIndex < 0 || fileIndex >= static_cast<int>(m_files.size()))
		{
			return false;
		}
		DataFile& file = m_files[static_cast<std::size_t>(fileIndex)];
		if (signalIndex < 0 || signalIndex >= static_cast<int>(file.signals.size()))
		{
			return false;
		}

		// 与 RemoveFile 同一思路：先把待移除项移到末位（move 赋值时其原有缓冲当场析构），
		// 再 pop_back + shrink_to_fit，使该信号的全部采样内存在本调用内立即归还给系统，
		// 而不是留在容量里等后续插入覆盖。
		std::vector<SignalData>& signals = file.signals;
		const std::size_t position = static_cast<std::size_t>(signalIndex);
		for (std::size_t index = position; index + 1 < signals.size(); ++index)
		{
			signals[index] = std::move(signals[index + 1]);
		}
		signals.pop_back();
		signals.shrink_to_fit();
		return true;
	}

	void DataSet::RemapSelectionAfterSignalRemoval(int fileIndex, int signalIndex)
	{
		if (fileIndex < 0 || signalIndex < 0 || m_selected.fileIndex != fileIndex)
		{
			return;
		}
		if (m_selected.signalIndex == signalIndex)
		{
			// 选中的信号本身被移除：取消选中。
			m_selected = SignalRef();
		}
		else if (m_selected.signalIndex > signalIndex)
		{
			// 其后信号整体前移一位。
			--m_selected.signalIndex;
		}
	}

	std::size_t DataSet::SignalCount() const
	{
		std::size_t count = 0;
		for (const DataFile& file : m_files)
		{
			count += file.signals.size();
		}
		return count;
	}

	const DataFile* DataSet::FileAt(int fileIndex) const
	{
		if (fileIndex < 0 || fileIndex >= static_cast<int>(m_files.size()))
		{
			return nullptr;
		}
		return &m_files[static_cast<std::size_t>(fileIndex)];
	}

	bool DataSet::SetSignalDisplayName(int fileIndex, int signalIndex, const std::wstring& name)
	{
		if (fileIndex < 0 || fileIndex >= static_cast<int>(m_files.size()))
		{
			return false;
		}

		DataFile& file = m_files[static_cast<std::size_t>(fileIndex)];
		if (signalIndex < 0 || signalIndex >= static_cast<int>(file.signals.size()))
		{
			return false;
		}

		// 统一去除首尾空白；结果为空则视为恢复原始列名。
		std::wstring trimmed = Trim(name);
		SignalData& signal = file.signals[static_cast<std::size_t>(signalIndex)];
		if (trimmed == signal.displayName)
		{
			return false;
		}
		signal.displayName = std::move(trimmed);
		return true;
	}

	bool DataSet::SetFileDisplayName(int fileIndex, const std::wstring& name)
	{
		if (fileIndex < 0 || fileIndex >= static_cast<int>(m_files.size()))
		{
			return false;
		}

		std::wstring trimmed = Trim(name);
		DataFile& file = m_files[static_cast<std::size_t>(fileIndex)];
		if (trimmed == file.displayName)
		{
			return false;
		}
		file.displayName = std::move(trimmed);
		return true;
	}

	const SignalData* DataSet::Resolve(const SignalRef& ref) const
	{
		const DataFile* file = FileAt(ref.fileIndex);
		if (file == nullptr)
		{
			return nullptr;
		}
		if (ref.signalIndex < 0 || ref.signalIndex >= static_cast<int>(file->signals.size()))
		{
			return nullptr;
		}
		return &file->signals[static_cast<std::size_t>(ref.signalIndex)];
	}

	const SignalStyle* DataSet::Style(const SignalRef& ref) const
	{
		const SignalData* signal = Resolve(ref);
		return (signal != nullptr) ? &signal->style : nullptr;
	}

	SignalStyle* DataSet::Style(const SignalRef& ref)
	{
		const DataFile* file = FileAt(ref.fileIndex);
		if (file == nullptr)
		{
			return nullptr;
		}
		if (ref.signalIndex < 0 || ref.signalIndex >= static_cast<int>(file->signals.size()))
		{
			return nullptr;
		}

		// 这里需要写入，因此借助非 const 路径重新定位信号。
		DataFile& mutableFile = m_files[static_cast<std::size_t>(ref.fileIndex)];
		return &mutableFile.signals[static_cast<std::size_t>(ref.signalIndex)].style;
	}

	double DataSet::MinTime() const
	{
		double value = std::numeric_limits<double>::infinity();
		for (const DataFile& file : m_files)
		{
			if (std::isfinite(file.minTime))
			{
				value = std::min(value, file.minTime);
			}
		}
		return std::isfinite(value) ? value : 0.0;
	}

	double DataSet::MaxTime() const
	{
		double value = -std::numeric_limits<double>::infinity();
		for (const DataFile& file : m_files)
		{
			if (std::isfinite(file.maxTime))
			{
				value = std::max(value, file.maxTime);
			}
		}
		return std::isfinite(value) ? value : 1.0;
	}

	void DataSet::RemapSelectionAfterFileRemoval(int fileIndex)
	{
		if (fileIndex < 0)
		{
			return;
		}
		if (m_selected.fileIndex == fileIndex)
		{
			m_selected = SignalRef();
		}
		else if (m_selected.fileIndex > fileIndex)
		{
			--m_selected.fileIndex;
		}
	}

	bool DataSet::ValidateSelection()
	{
		if (!m_selected.IsValid())
		{
			return false;
		}
		if (Resolve(m_selected) != nullptr)
		{
			return false;
		}
		m_selected = SignalRef();
		return true;
	}

	// ============================ 采样辅助 ============================

	void ComputeMovingAverage(const std::vector<double>& values, int radius, std::vector<float>& out)
	{
		const int window = std::max(0, radius);
		const std::size_t count = values.size();
		out.assign(count, std::numeric_limits<float>::quiet_NaN());
		if (count == 0 || window == 0)
		{
			// 半径 0 表示不平滑：原样复制（中心点无效处仍为 NaN）。
			for (std::size_t index = 0; index < count; ++index)
			{
				if (std::isfinite(values[index]))
				{
					out[index] = static_cast<float>(values[index]);
				}
			}
			return;
		}

		// 滑动窗口求和：窗口 = [max(0,i-N), min(count-1,i+N)]，
		// 每前进一步只增减边界处的两个采样点，整体 O(n)，不额外占用前缀和内存。
		double sum = 0.0;
		std::size_t finiteCount = 0;
		std::size_t windowLow = 0;
		std::size_t windowHigh = 0;	// 闭区间右端。

		const auto addValue = [&sum, &finiteCount](double value)
		{
			if (std::isfinite(value))
			{
				sum += value;
				++finiteCount;
			}
		};
		const auto removeValue = [&sum, &finiteCount](double value)
		{
			if (std::isfinite(value))
			{
				sum -= value;
				--finiteCount;
			}
		};

		for (std::size_t index = 0; index < count; ++index)
		{
			const std::size_t low = (index > static_cast<std::size_t>(window))
			                            ? (index - static_cast<std::size_t>(window))
			                            : 0;
			const std::size_t high = std::min(count - 1, index + static_cast<std::size_t>(window));

			if (index == 0)
			{
				windowLow = low;
				windowHigh = high;
				for (std::size_t i = windowLow; i <= windowHigh; ++i)
				{
					addValue(values[i]);
				}
			}
			else
			{
				while (windowLow < low)
				{
					removeValue(values[windowLow]);
					++windowLow;
				}
				while (windowHigh < high)
				{
					++windowHigh;
					addValue(values[windowHigh]);
				}
			}

			// 中心点本身无效（NaN）时该处不产生有效结果。
			if (finiteCount > 0 && std::isfinite(values[index]))
			{
				out[index] = static_cast<float>(sum / static_cast<double>(finiteCount));
			}
		}
	}

	int FindNearestSample(const DataFile& file, double time)
	{
		const std::size_t count = file.time.size();
		if (count == 0)
		{
			return -1;
		}

		if (file.timeMonotonic)
		{
			const std::vector<double>::const_iterator lower =
			    std::lower_bound(file.time.begin(), file.time.end(), time);
			if (lower == file.time.begin())
			{
				return 0;
			}
			if (lower == file.time.end())
			{
				return static_cast<int>(count - 1);
			}
			const std::size_t rightIndex = static_cast<std::size_t>(lower - file.time.begin());
			const std::size_t leftIndex = rightIndex - 1;
			const double leftDistance = std::fabs(time - file.time[leftIndex]);
			const double rightDistance = std::fabs(file.time[rightIndex] - time);
			return (leftDistance <= rightDistance) ? static_cast<int>(leftIndex) : static_cast<int>(rightIndex);
		}

		int best = 0;
		double bestDistance = std::numeric_limits<double>::infinity();
		for (std::size_t index = 0; index < count; ++index)
		{
			if (!std::isfinite(file.time[index]))
			{
				continue;
			}
			const double distance = std::fabs(file.time[index] - time);
			if (distance < bestDistance)
			{
				bestDistance = distance;
				best = static_cast<int>(index);
			}
		}
		return best;
	}

	bool SampleSignalAt(const DataFile& file, const SignalData& signal, double time, bool interpolate,
	                    double& value)
	{
		value = kMissing;

		if (file.time.empty() || signal.values.empty())
		{
			return false;
		}
		if (time < file.minTime || time > file.maxTime)
		{
			return false;
		}

		const std::vector<double>& values = signal.values;

		if (!file.timeMonotonic)
		{
			const int nearest = FindNearestSample(file, time);
			if (nearest < 0 || static_cast<std::size_t>(nearest) >= values.size())
			{
				return false;
			}
			value = values[static_cast<std::size_t>(nearest)];
			return std::isfinite(value);
		}

		const std::vector<double>::const_iterator lower = std::lower_bound(file.time.begin(), file.time.end(), time);
		const std::size_t rightIndex = static_cast<std::size_t>(lower - file.time.begin());
		if (rightIndex == 0)
		{
			value = values[0];
			return std::isfinite(value);
		}
		if (rightIndex >= file.time.size())
		{
			value = values.back();
			return std::isfinite(value);
		}

		const std::size_t leftIndex = rightIndex - 1;
		if (rightIndex >= values.size() || leftIndex >= values.size())
		{
			return false;
		}

		const double t0 = file.time[leftIndex];
		const double t1 = file.time[rightIndex];
		const double v0 = values[leftIndex];
		const double v1 = values[rightIndex];

		if (!interpolate || !std::isfinite(v0) || !std::isfinite(v1) || !(t1 > t0))
		{
			const double leftDistance = std::fabs(time - t0);
			const double rightDistance = std::fabs(t1 - time);
			value = (leftDistance <= rightDistance) ? v0 : v1;
			return std::isfinite(value);
		}

		const double ratio = (time - t0) / (t1 - t0);
		value = v0 + (v1 - v0) * ratio;
		return true;
	}

	// ============================ TabConfig ============================

	TabConfig::TabConfig()
	    : m_name(L"视图 1")
	{
	}

	void TabConfig::SyncToDataSet(const DataSet& dataSet)
	{
		const std::size_t fileCount = dataSet.FileCount();
		m_visible.resize(fileCount);
		m_collapsed.resize(fileCount, false);

		for (std::size_t fileIndex = 0; fileIndex < fileCount; ++fileIndex)
		{
			const DataFile* file = dataSet.FileAt(static_cast<int>(fileIndex));
			if (file == nullptr)
			{
				continue;
			}

			// 新增信号默认为未勾选（由用户自行决定查看哪些信号），
			// 其显示外观已在 DataSet 中初始化完毕。
			m_visible[fileIndex].resize(file->signals.size(), false);
		}

		// 清理已失效的网格引用（选中状态由 DataSet 统一维护）。
		for (Lane& lane : m_lanes)
		{
			std::vector<SignalRef>& refs = lane.signals;
			refs.erase(std::remove_if(refs.begin(), refs.end(),
			                          [&dataSet](const SignalRef& ref) { return dataSet.Resolve(ref) == nullptr; }),
			           refs.end());
		}
		m_lanes.erase(std::remove_if(m_lanes.begin(), m_lanes.end(),
		                             [](const Lane& lane) { return lane.signals.empty(); }),
		              m_lanes.end());

		SyncLanes();
	}

	void TabConfig::RemapAfterFileRemoval(int fileIndex)
	{
		if (fileIndex < 0)
		{
			return;
		}

		const std::size_t slot = static_cast<std::size_t>(fileIndex);
		if (slot < m_visible.size())
		{
			m_visible.erase(m_visible.begin() + fileIndex);
		}
		if (slot < m_collapsed.size())
		{
			m_collapsed.erase(m_collapsed.begin() + fileIndex);
		}

		for (Lane& lane : m_lanes)
		{
			std::vector<SignalRef>& refs = lane.signals;
			refs.erase(std::remove_if(refs.begin(), refs.end(),
			                          [fileIndex](const SignalRef& ref)
			                          { return ref.fileIndex == fileIndex; }),
			           refs.end());
			for (SignalRef& ref : refs)
			{
				if (ref.fileIndex > fileIndex)
				{
					--ref.fileIndex;
				}
			}
		}
		m_lanes.erase(std::remove_if(m_lanes.begin(), m_lanes.end(),
		                             [](const Lane& lane) { return lane.signals.empty(); }),
		              m_lanes.end());
	}

	void TabConfig::RemapAfterSignalRemoval(int fileIndex, int signalIndex)
	{
		if (fileIndex < 0 || signalIndex < 0)
		{
			return;
		}

		// 可见性表：删掉该信号对应的那一列。
		const std::size_t slot = static_cast<std::size_t>(fileIndex);
		if (slot < m_visible.size())
		{
			std::vector<bool>& fileVisible = m_visible[slot];
			if (static_cast<std::size_t>(signalIndex) < fileVisible.size())
			{
				fileVisible.erase(fileVisible.begin() + signalIndex);
			}
		}

		// 网格归属：删掉该信号本身，并把同一文件内位于其后的引用下标前移一位。
		for (Lane& lane : m_lanes)
		{
			std::vector<SignalRef>& refs = lane.signals;
			refs.erase(std::remove_if(refs.begin(), refs.end(),
			                          [fileIndex, signalIndex](const SignalRef& ref)
			                          {
				                          return ref.fileIndex == fileIndex &&
				                                 ref.signalIndex == signalIndex;
			                          }),
			           refs.end());
			for (SignalRef& ref : refs)
			{
				if (ref.fileIndex == fileIndex && ref.signalIndex > signalIndex)
				{
					--ref.signalIndex;
				}
			}
		}
		// 被移除信号若独占了某个网格，该网格随之消失（与取消勾选的行为一致）。
		m_lanes.erase(std::remove_if(m_lanes.begin(), m_lanes.end(),
		                             [](const Lane& lane) { return lane.signals.empty(); }),
		              m_lanes.end());
	}

	bool TabConfig::IsVisible(const SignalRef& ref) const
	{
		if (ref.fileIndex < 0 || static_cast<std::size_t>(ref.fileIndex) >= m_visible.size())
		{
			return false;
		}
		const std::vector<bool>& fileVisible = m_visible[static_cast<std::size_t>(ref.fileIndex)];
		if (ref.signalIndex < 0 || static_cast<std::size_t>(ref.signalIndex) >= fileVisible.size())
		{
			return false;
		}
		return fileVisible[static_cast<std::size_t>(ref.signalIndex)];
	}

	void TabConfig::SetVisible(const SignalRef& ref, bool visible)
	{
		if (ref.fileIndex < 0 || static_cast<std::size_t>(ref.fileIndex) >= m_visible.size())
		{
			return;
		}
		std::vector<bool>& fileVisible = m_visible[static_cast<std::size_t>(ref.fileIndex)];
		if (ref.signalIndex < 0 || static_cast<std::size_t>(ref.signalIndex) >= fileVisible.size())
		{
			return;
		}
		if (fileVisible[static_cast<std::size_t>(ref.signalIndex)] == visible)
		{
			return;
		}
		fileVisible[static_cast<std::size_t>(ref.signalIndex)] = visible;

		// 合并模式下新勾选的信号独占一个新网格：切到自定义划分后，
		// RebuildLanes 会把尚未分配网格的可见信号各自放入新网格。
		if (visible && m_laneMode == LaneMode::MERGED)
		{
			m_laneMode = LaneMode::CUSTOM;
		}

		SyncLanes();
	}

	void TabConfig::ToggleVisible(const SignalRef& ref)
	{
		SetVisible(ref, !IsVisible(ref));
	}

	void TabConfig::SetFileVisible(int fileIndex, bool visible)
	{
		if (fileIndex < 0 || static_cast<std::size_t>(fileIndex) >= m_visible.size())
		{
			return;
		}
		std::vector<bool>& fileVisible = m_visible[static_cast<std::size_t>(fileIndex)];
		// 合并模式下“新增”的信号同样应各自独占网格（与 SetVisible 一致）：
		// 先切到自定义划分，RebuildLanes 会把尚未分配网格的可见信号追加到最下方。
		// 只有确实存在“原本不可见”的信号时才切模式，避免重复点击默默改掉划分策略。
		const bool anyHidden =
		    std::find(fileVisible.begin(), fileVisible.end(), false) != fileVisible.end();
		if (visible && anyHidden && m_laneMode == LaneMode::MERGED)
		{
			m_laneMode = LaneMode::CUSTOM;
		}
		std::fill(fileVisible.begin(), fileVisible.end(), visible);
		SyncLanes();
	}

	void TabConfig::SetAllVisible(bool visible)
	{
		bool anyHidden = false;
		for (const std::vector<bool>& fileVisible : m_visible)
		{
			if (std::find(fileVisible.begin(), fileVisible.end(), false) != fileVisible.end())
			{
				anyHidden = true;
				break;
			}
		}
		// 同上：合并模式下新增的信号各自独占网格，且排列在最下方。
		if (visible && anyHidden && m_laneMode == LaneMode::MERGED)
		{
			m_laneMode = LaneMode::CUSTOM;
		}
		for (std::vector<bool>& fileVisible : m_visible)
		{
			std::fill(fileVisible.begin(), fileVisible.end(), visible);
		}
		SyncLanes();
	}

	void TabConfig::SoloSignal(const SignalRef& ref)
	{
		for (std::vector<bool>& fileVisible : m_visible)
		{
			std::fill(fileVisible.begin(), fileVisible.end(), false);
		}
		SetVisible(ref, true);
	}

	bool TabConfig::FileHasVisible(int fileIndex) const
	{
		if (fileIndex < 0 || static_cast<std::size_t>(fileIndex) >= m_visible.size())
		{
			return false;
		}
		const std::vector<bool>& fileVisible = m_visible[static_cast<std::size_t>(fileIndex)];
		return std::find(fileVisible.begin(), fileVisible.end(), true) != fileVisible.end();
	}

	bool TabConfig::FileAllVisible(int fileIndex) const
	{
		if (fileIndex < 0 || static_cast<std::size_t>(fileIndex) >= m_visible.size())
		{
			return false;
		}
		const std::vector<bool>& fileVisible = m_visible[static_cast<std::size_t>(fileIndex)];
		if (fileVisible.empty())
		{
			return false;
		}
		return std::find(fileVisible.begin(), fileVisible.end(), false) == fileVisible.end();
	}

	bool TabConfig::AnyVisible() const
	{
		for (const std::vector<bool>& fileVisible : m_visible)
		{
			if (std::find(fileVisible.begin(), fileVisible.end(), true) != fileVisible.end())
			{
				return true;
			}
		}
		return false;
	}

	int TabConfig::VisibleCount() const
	{
		int count = 0;
		for (const std::vector<bool>& fileVisible : m_visible)
		{
			count += static_cast<int>(std::count(fileVisible.begin(), fileVisible.end(), true));
		}
		return count;
	}

	void TabConfig::SetMode(LaneMode mode)
	{
		m_laneMode = mode;
		SyncLanes();
	}

	void TabConfig::SyncLanes()
	{
		RebuildLanes(m_visible, m_lanes, m_laneMode);
	}

	int TabConfig::LaneOfSignal(const SignalRef& ref) const
	{
		for (std::size_t lane = 0; lane < m_lanes.size(); ++lane)
		{
			const std::vector<SignalRef>& refs = m_lanes[lane].signals;
			if (std::find(refs.begin(), refs.end(), ref) != refs.end())
			{
				return static_cast<int>(lane);
			}
		}
		return -1;
	}

	int TabConfig::MoveSignalToLane(const DataSet& dataSet, const SignalRef& ref, int laneIndex)
	{
		if (dataSet.Resolve(ref) == nullptr)
		{
			return -1;
		}

		const int sourceLane = LaneOfSignal(ref);
		if (laneIndex >= 0 && laneIndex == sourceLane)
		{
			// 拖回原网格：无需变动，避免因网格回收导致顺序抖动。
			return sourceLane;
		}

		// 先把目标网格的“锚信号”固定下来：移除信号后空网格会被回收，
		// 下标随之变化，必须用不依赖下标的引用找回真正的目标网格
		// （否则会变成“与原网格交换位置”而不是合并进去）。
		SignalRef targetAnchor;
		bool hasTarget = (laneIndex >= 0 && laneIndex < static_cast<int>(m_lanes.size()));
		if (hasTarget)
		{
			const std::vector<SignalRef>& targetSignals = m_lanes[static_cast<std::size_t>(laneIndex)].signals;
			for (const SignalRef& candidate : targetSignals)
			{
				if (!(candidate == ref))
				{
					targetAnchor = candidate;
					break;
				}
			}
		}

		// 手动指定归属意味着切换到自定义划分策略。
		m_laneMode = LaneMode::CUSTOM;

		for (Lane& lane : m_lanes)
		{
			std::vector<SignalRef>& refs = lane.signals;
			refs.erase(std::remove(refs.begin(), refs.end(), ref), refs.end());
		}
		m_lanes.erase(std::remove_if(m_lanes.begin(), m_lanes.end(),
		                             [](const Lane& lane) { return lane.signals.empty(); }),
		              m_lanes.end());

		int destination = -1;
		if (hasTarget && targetAnchor.IsValid())
		{
			for (std::size_t index = 0; index < m_lanes.size(); ++index)
			{
				const std::vector<SignalRef>& refs = m_lanes[index].signals;
				if (std::find(refs.begin(), refs.end(), targetAnchor) != refs.end())
				{
					destination = static_cast<int>(index);
					break;
				}
			}
		}

		if (destination >= 0)
		{
			m_lanes[static_cast<std::size_t>(destination)].signals.push_back(ref);
		}
		else
		{
			Lane lane;
			lane.autoRange = true;
			lane.signals.push_back(ref);
			m_lanes.push_back(std::move(lane));
		}

		for (std::size_t index = 0; index < m_lanes.size(); ++index)
		{
			m_lanes[index].name = L"网格 " + std::to_wstring(index + 1);
		}
		return LaneOfSignal(ref);
	}

	int TabConfig::SplitLane(int laneIndex)
	{
		if (laneIndex < 0 || laneIndex >= static_cast<int>(m_lanes.size()))
		{
			return -1;
		}
		const std::vector<SignalRef> signals = m_lanes[static_cast<std::size_t>(laneIndex)].signals;
		if (signals.size() <= 1)
		{
			// 只有一条信号时无需拆分（本就独占一个网格）。
			return -1;
		}

		// 手动排布 → 切换到自定义划分策略。
		m_laneMode = LaneMode::CUSTOM;

		// 用原网格的“网格自身状态”（Y 轴自适应/边沿计数等）作为每一份的初始状态，
		// 这样拆分出来的网格保持原网格的显示设置。
		const Lane source = m_lanes[static_cast<std::size_t>(laneIndex)];

		std::vector<Lane> pieces;
		pieces.reserve(signals.size());
		for (const SignalRef& ref : signals)
		{
			Lane lane;
			lane.autoRange = source.autoRange;
			lane.yMin = source.yMin;
			lane.yMax = source.yMax;
			lane.fitYToSelection = source.fitYToSelection;
			lane.edgeCount = source.edgeCount;
			lane.edgeValue = source.edgeValue;
			lane.edgeValueValid = source.edgeValueValid;
			lane.edgePanelOpen = source.edgePanelOpen;
			lane.edgePanelX = source.edgePanelX;
			lane.edgePanelY = source.edgePanelY;
			lane.edgeCenter = source.edgeCenter;
			lane.edgeCenterSmooth = source.edgeCenterSmooth;
			lane.edgeCenterPanelOpen = source.edgeCenterPanelOpen;
			lane.edgeCenterPanelX = source.edgeCenterPanelX;
			lane.edgeCenterPanelY = source.edgeCenterPanelY;
			lane.meanFilter = source.meanFilter;
			lane.meanFilterRadius = source.meanFilterRadius;
			lane.meanFilterPanelOpen = source.meanFilterPanelOpen;
			lane.meanFilterPanelX = source.meanFilterPanelX;
			lane.meanFilterPanelY = source.meanFilterPanelY;
			lane.signals.push_back(ref);
			pieces.push_back(std::move(lane));
		}

		// 用 pieces 替换原网格（插入到原位置，因此其后方的网格整体顺次后移）。
		m_lanes.erase(m_lanes.begin() + laneIndex);
		m_lanes.insert(m_lanes.begin() + laneIndex, pieces.begin(), pieces.end());

		// 统一重命名，保证编号连续（GX 编号在各显示位置均由此位置推导）。
		for (std::size_t index = 0; index < m_lanes.size(); ++index)
		{
			m_lanes[index].name = L"网格 " + std::to_wstring(index + 1);
		}
		return laneIndex;
	}

	void TabConfig::RemapAfterSignalInsert(int fileIndex, int insertPos)
	{
		if (fileIndex < 0 || insertPos < 0)
		{
			return;
		}

		// 可见性表：在插入点补一列（新信号默认不可见，由调用方按需勾选）。
		const std::size_t slot = static_cast<std::size_t>(fileIndex);
		if (slot < m_visible.size() && static_cast<std::size_t>(insertPos) <= m_visible[slot].size())
		{
			m_visible[slot].insert(m_visible[slot].begin() + insertPos, false);
		}

		// 网格内的信号引用：同一文件中位于插入点之后的引用下标整体后移。
		for (Lane& lane : m_lanes)
		{
			for (SignalRef& ref : lane.signals)
			{
				if (ref.fileIndex == fileIndex && ref.signalIndex >= insertPos)
				{
					++ref.signalIndex;
				}
			}
		}
	}

	bool TabConfig::MoveLaneOfSignalBelow(const SignalRef& moved, const SignalRef& anchor)
	{
		const int from = LaneOfSignal(moved);
		if (from < 0 || LaneOfSignal(anchor) < 0)
		{
			return false;
		}

		Lane lane = std::move(m_lanes[static_cast<std::size_t>(from)]);
		m_lanes.erase(m_lanes.begin() + from);

		// erase 之后锚点网格的下标可能变化，必须用信号引用重新定位。
		const int target = LaneOfSignal(anchor);
		if (target < 0)
		{
			m_lanes.push_back(std::move(lane));
		}
		else
		{
			m_lanes.insert(m_lanes.begin() + target + 1, std::move(lane));
		}

		// 手动排布 → 切换到自定义划分策略，避免后续重建网格时顺序被还原。
		m_laneMode = LaneMode::CUSTOM;
		RenameLanes();
		return true;
	}

	void TabConfig::RenameLanes()
	{
		for (std::size_t index = 0; index < m_lanes.size(); ++index)
		{
			m_lanes[index].name = L"网格 " + std::to_wstring(index + 1);
		}
	}

	bool TabConfig::IsCollapsed(int fileIndex) const
	{
		if (fileIndex < 0 || static_cast<std::size_t>(fileIndex) >= m_collapsed.size())
		{
			return false;
		}
		return m_collapsed[static_cast<std::size_t>(fileIndex)];
	}

	void TabConfig::ToggleCollapsed(int fileIndex)
	{
		if (fileIndex < 0)
		{
			return;
		}
		if (static_cast<std::size_t>(fileIndex) >= m_collapsed.size())
		{
			m_collapsed.resize(static_cast<std::size_t>(fileIndex) + 1, false);
		}
		m_collapsed[static_cast<std::size_t>(fileIndex)] = !m_collapsed[static_cast<std::size_t>(fileIndex)];
	}

	void TabConfig::ComputeLaneRange(const DataSet& dataSet, int laneIndex, double& yMin, double& yMax) const
	{
		if (laneIndex < 0 || laneIndex >= static_cast<int>(m_lanes.size()))
		{
			yMin = 0.0;
			yMax = 1.0;
			return;
		}

		const Lane& lane = m_lanes[static_cast<std::size_t>(laneIndex)];
		if (!lane.autoRange)
		{
			yMin = lane.yMin;
			yMax = lane.yMax;
			if (!(yMax > yMin))
			{
				yMin = 0.0;
				yMax = 1.0;
			}
			return;
		}

		double low = std::numeric_limits<double>::infinity();
		double high = -std::numeric_limits<double>::infinity();
		for (const SignalRef& ref : lane.signals)
		{
			if (!IsVisible(ref))
			{
				continue;
			}
			const SignalData* signal = dataSet.Resolve(ref);
			if (signal == nullptr || signal->finiteCount == 0)
			{
				continue;
			}
			low = std::min(low, signal->minValue);
			high = std::max(high, signal->maxValue);
		}

		if (!std::isfinite(low) || !std::isfinite(high))
		{
			low = 0.0;
			high = 1.0;
		}
		PadRange(low, high);
		yMin = low;
		yMax = high;
	}

	bool TabConfig::ComputeVisibleTimeBounds(const DataSet& dataSet, double& minTime, double& maxTime) const
	{
		double low = std::numeric_limits<double>::infinity();
		double high = -std::numeric_limits<double>::infinity();

		for (std::size_t fileIndex = 0; fileIndex < m_visible.size(); ++fileIndex)
		{
			const std::vector<bool>& fileVisible = m_visible[fileIndex];
			if (std::find(fileVisible.begin(), fileVisible.end(), true) == fileVisible.end())
			{
				continue;
			}

			const DataFile* file = dataSet.FileAt(static_cast<int>(fileIndex));
			if (file == nullptr)
			{
				continue;
			}
			if (std::isfinite(file->minTime))
			{
				low = std::min(low, file->minTime);
			}
			if (std::isfinite(file->maxTime))
			{
				high = std::max(high, file->maxTime);
			}
		}

		if (!std::isfinite(low) || !std::isfinite(high) || !(high > low))
		{
			return false;
		}
		minTime = low;
		maxTime = high;
		return true;
	}

} // namespace jdi