#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)
		{
			// 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)];
			};

			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。
				lanes.clear();
				lanes.reserve(visibleRefs.size());
				for (const SignalRef& ref : visibleRefs)
				{
					Lane lane;
					lane.autoRange = true;
					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;
					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;
					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";
		}
	}

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

	void DataSet::Clear()
	{
		m_files.clear();
	}

	bool DataSet::AddFromTable(const CsvTable& table, const std::wstring& filePath, std::wstring& error,
	                           int& fileIndex)
	{
		error.clear();
		fileIndex = -1;

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

		const std::size_t columnCount = table.headers.size();
		const std::size_t rowCount = table.rows.size();

		DataFile file;

		// 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;
		}

		file.time.resize(rowCount);
		std::size_t finiteTimeCount = 0;
		bool monotonic = true;
		double previousTime = 0.0;
		bool hasPrevious = false;

		for (std::size_t row = 0; row < rowCount; ++row)
		{
			const double value = table.rows[row][static_cast<std::size_t>(timeColumn)];
			file.time[row] = value;
			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。
		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.resize(rowCount);
			double minValue = std::numeric_limits<double>::infinity();
			double maxValue = -std::numeric_limits<double>::infinity();
			std::size_t finiteCount = 0;

			for (std::size_t row = 0; row < rowCount; ++row)
			{
				const double value = table.rows[row][column];
				signal.values[row] = value;
				if (std::isfinite(value))
				{
					++finiteCount;
					minValue = std::min(minValue, value);
					maxValue = std::max(maxValue, value);
				}
			}

			if (finiteCount == 0)
			{
				signal.minValue = 0.0;
				signal.maxValue = 0.0;
			}
			else
			{
				signal.minValue = minValue;
				signal.maxValue = maxValue;
			}
			signal.finiteCount = 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。
			{
				int paletteCount = 0;
				const std::uint32_t* palette = SignalPalette(paletteCount);
				const std::size_t globalIndex = SignalCount() + file.signals.size();
				signal.style.color =
				    (palette != nullptr && paletteCount > 0)
				        ? palette[globalIndex % static_cast<std::size_t>(paletteCount)]
				        : 0xFF268BD2u;
				signal.style.customColor = signal.style.color;
				signal.style.opacity = 1.0f;
				signal.style.lineWidth = 1.6f;
				signal.style.mode = DrawMode::LINE;
			}

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

		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。
		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;

		m_files.push_back(std::move(file));
		fileIndex = static_cast<int>(m_files.size()) - 1;
		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;
	}

	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;
	}

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

	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 SampleFileAt(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);
		}

		// 清理已失效的选中状态与网格引用。
		if (m_selected.IsValid() && dataSet.Resolve(m_selected) == nullptr)
		{
			m_selected = SignalRef();
		}

		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(dataSet);
	}

	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());

		if (m_selected.fileIndex == fileIndex)
		{
			m_selected = SignalRef();
		}
		else if (m_selected.fileIndex > fileIndex)
		{
			--m_selected.fileIndex;
		}
	}

	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 DataSet& dataSet, 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(dataSet);
	}

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

	void TabConfig::SetFileVisible(const DataSet& dataSet, 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)];
		std::fill(fileVisible.begin(), fileVisible.end(), visible);
		SyncLanes(dataSet);
	}

	void TabConfig::SetAllVisible(const DataSet& dataSet, bool visible)
	{
		for (std::vector<bool>& fileVisible : m_visible)
		{
			std::fill(fileVisible.begin(), fileVisible.end(), visible);
		}
		SyncLanes(dataSet);
	}

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

	bool TabConfig::FileHasVisible(const DataSet& dataSet, int fileIndex) const
	{
		(void)dataSet;
		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(const DataSet& dataSet, int fileIndex) const
	{
		(void)dataSet;
		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(const DataSet& dataSet, LaneMode mode)
	{
		m_laneMode = mode;
		SyncLanes(dataSet);
	}

	void TabConfig::SyncLanes(const DataSet& dataSet)
	{
		(void)dataSet;
		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);
	}

	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