feat: 新增 C2S/UGC/SUS 谱面格式支持 (chu)

chart/chu/C2sChart.cs

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+using MuConvert.chart;
+
+namespace MuConvert.chu;
+
+/**
+ * C2S 格式谱面 IR（官方格式，RESOLUTION=384 tick/小节）。
+ */
+public class C2sChart : BaseChart<ChuNote>, IChuChart
+{
+    public string Version { get; set; } = "1.08.00\t1.08.00";
+    public int MusicId { get; set; }
+    public int DifficultId { get; set; }
+    public string Creator { get; set; } = "";
+    public int Resolution { get; set; } = 384;
+    public double DefBpm { get; set; } = 120.0;
+    public List<(int Measure, int Offset, double Bpm)> BpmEvents = [];
+    public List<(int Measure, int Offset, int Denom, int Num)> MetEvents = [];
+    public List<(int Measure, int Offset, int Duration, double Multiplier)> SflEvents = [];
+
+    public override decimal StartBpm => (decimal)(BpmEvents.Count > 0 ? BpmEvents[0].Bpm : DefBpm);
+    public override decimal StartTime => Notes.Count > 0 ? Notes.Min(n => n.Measure * Resolution + n.Offset) / (decimal)Resolution * 240m / StartBpm : 0;
+    public override decimal EndTime => Notes.Count > 0 ? Notes.Max(n => n.Measure * Resolution + n.Offset + Math.Max(n.HoldDuration, Math.Max(n.SlideDuration, n.AirHoldDuration))) / (decimal)Resolution * 240m / StartBpm : 0;
+    public override int TotalNotes => Notes.Count;
+}

chart/chu/ChuNote.cs

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+namespace MuConvert.chu;
+
+/**
+ * CHUNITHM 通用音符，C2S / UGC / SUS 共用此结构。
+ */
+public class ChuNote
+{
+    /** 音符类型 (TAP, CHR, HLD, SLD, AIR, AHD 等) */
+    public string Type { get; set; } = "TAP";
+    /** 小节号 */
+    public int Measure { get; set; }
+    /** 小节内偏移 (C2S: 0–383, UGC/SUS: 0–1919) */
+    public int Offset { get; set; }
+    /** 起始列 (0–15) */
+    public int Cell { get; set; }
+    /** 宽度 (1–16) */
+    public int Width { get; set; } = 1;
+    /** HLD 持续时长 */
+    public int HoldDuration { get; set; }
+    /** SLD 持续时长 */
+    public int SlideDuration { get; set; }
+    /** SLD 终点列 */
+    public int EndCell { get; set; }
+    /** SLD 终点宽度 */
+    public int EndWidth { get; set; } = 1;
+    /** CHR/FLK 附加数据（方向等） */
+    public string Extra { get; set; } = "";
+    /** AIR/AHD 关联的目标音符类型 */
+    public string TargetNote { get; set; } = "";
+    /** AHD 持续时长 */
+    public int AirHoldDuration { get; set; }
+    /** Air Crush 起始高度 */
+    public int StartHeight { get; set; }
+    /** Air Crush 目标高度 */
+    public int TargetHeight { get; set; }
+    /** Air Crush 颜色 */
+    public string NoteColor { get; set; } = "";
+}

chart/chu/IChuChart.cs

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+using MuConvert.chart;
+
+namespace MuConvert.chu;
+
+/**
+ * CHUNITHM 所有谱面格式的统一接口，作为 Generator 的输入类型。
+ */
+public interface IChuChart : IBaseChart;

chart/chu/SusChart.cs

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+using MuConvert.chart;
+
+namespace MuConvert.chu;
+
+/**
+ * SUS 格式谱面 IR（REQUEST=480 tick/拍，lane 0–31）。
+ */
+public class SusChart : BaseChart<ChuNote>, IChuChart
+{
+    public string Title { get; set; } = "";
+    public string Artist { get; set; } = "";
+    public string Designer { get; set; } = "";
+    public int TicksPerBeat { get; set; } = 480;
+    public double Bpm { get; set; } = 120.0;
+
+    public override decimal StartBpm => (decimal)Bpm;
+    public override decimal StartTime => Notes.Count > 0 ? Notes.Min(n => n.Measure * TicksPerBeat * 4 + n.Offset) / (decimal)(TicksPerBeat * 4) * 240m / StartBpm : 0;
+    public override decimal EndTime => Notes.Count > 0 && StartBpm > 0 ? Notes.Max(n => n.Measure * TicksPerBeat * 4 + n.Offset + Math.Max(n.HoldDuration, Math.Max(n.SlideDuration, n.AirHoldDuration))) / (decimal)(TicksPerBeat * 4) * 240m / StartBpm : 0;
+    public override int TotalNotes => Notes.Count;
+}

chart/chu/UgcChart.cs

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+using MuConvert.chart;
+
+namespace MuConvert.chu;
+
+/**
+ * UGC 格式谱面 IR（UMIGURI 格式，@TICKS=480 tick/拍）。
+ */
+public class UgcChart : BaseChart<ChuNote>, IChuChart
+{
+    public string Version { get; set; } = "6";
+    public string Title { get; set; } = "";
+    public string Artist { get; set; } = "";
+    public string Designer { get; set; } = "";
+    public string Difficulty { get; set; } = "";
+    public int Level { get; set; }
+    public double Constant { get; set; }
+    public string SongId { get; set; } = "";
+    public int TicksPerBeat { get; set; } = 480;
+    public List<(int Measure, int Num, int Den)> BeatEvents = [];
+    public List<(int Measure, int Offset, double Bpm)> BpmEvents = [];
+    public List<(int Measure, int Offset, double Multiplier)> SpeedEvents = [];
+
+    public override decimal StartBpm => (decimal)(BpmEvents.Count > 0 ? BpmEvents[0].Bpm : 120.0);
+    public override decimal StartTime => Notes.Count > 0 ? Notes.Min(n => n.Measure * TicksPerBeat * 4 + n.Offset) / (decimal)(TicksPerBeat * 4) * 240m / StartBpm : 0;
+    public override decimal EndTime => Notes.Count > 0 && StartBpm > 0 ? Notes.Max(n => n.Measure * TicksPerBeat * 4 + n.Offset + Math.Max(n.HoldDuration, Math.Max(n.SlideDuration, n.AirHoldDuration))) / (decimal)(TicksPerBeat * 4) * 240m / StartBpm : 0;
+    public override int TotalNotes => Notes.Count;
+}

generator/chu/C2sGenerator.cs

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+using System.Globalization;
+using System.Text;
+using MuConvert.chart;
+using MuConvert.generator;
+using MuConvert.utils;
+using static MuConvert.utils.Alert.LEVEL;
+
+namespace MuConvert.chu;
+
+/**
+ * C2S 格式生成器。
+ * 输入 IChuChart，内部自动转换后输出 C2S 文本。
+ */
+public class C2sGenerator : IGenerator<IChuChart>
+{
+    private const int C2sResolution = 384;
+
+    public (string, List<Alert>) Generate(IChuChart chart)
+    {
+        var alerts = new List<Alert>();
+        var c2s = ConvertToC2s(chart, alerts);
+        var text = Serialize(c2s);
+        return (text, alerts);
+    }
+
+    private static C2sChart ConvertToC2s(IChuChart chart, List<Alert> alerts)
+    {
+        if (chart is C2sChart c2s) return c2s;
+
+        if (chart is UgcChart ugc)
+        {
+            var result = new C2sChart
+            {
+                Version = "1.08.00\t1.08.00",
+                Creator = ugc.Designer,
+                DefBpm = ugc.BpmEvents.Count > 0 ? ugc.BpmEvents[0].Bpm : 120.0,
+            };
+            foreach (var b in ugc.BpmEvents)
+                result.BpmEvents.Add((b.Measure, ScaleDown(b.Offset, ugc.TicksPerBeat), b.Bpm));
+            foreach (var b in ugc.BeatEvents)
+                result.MetEvents.Add((b.Measure, 0, b.Den, b.Num));
+            foreach (var n in ugc.Notes)
+                result.Notes.Add(ScaleNote(n, ugc.TicksPerBeat));
+            return result;
+        }
+
+        if (chart is SusChart sus)
+        {
+            var result = new C2sChart { DefBpm = sus.Bpm };
+            result.BpmEvents.Add((0, 0, sus.Bpm));
+            foreach (var n in sus.Notes)
+                result.Notes.Add(ScaleNote(n, sus.TicksPerBeat));
+            return result;
+        }
+
+        alerts.Add(new Alert(Error, string.Format(Locale.ChuGeneratorUnsupported, "→ C2S")));
+        throw new ConversionException(alerts);
+    }
+
+    private static ChuNote ScaleNote(ChuNote n, int tpb)
+    {
+        int scaleDown(int v) => (int)((long)v * (C2sResolution / 4) / tpb);
+        return new ChuNote
+        {
+            Type = n.Type, Measure = n.Measure, Offset = scaleDown(n.Offset),
+            Cell = n.Cell, Width = n.Width,
+            HoldDuration = scaleDown(n.HoldDuration), SlideDuration = scaleDown(n.SlideDuration),
+            EndCell = n.EndCell, EndWidth = n.EndWidth,
+            Extra = n.Extra, TargetNote = n.TargetNote, AirHoldDuration = scaleDown(n.AirHoldDuration),
+            StartHeight = n.StartHeight, TargetHeight = n.TargetHeight, NoteColor = n.NoteColor,
+        };
+    }
+
+    private static int ScaleDown(int ticks, int tpb) => (int)((long)ticks * (C2sResolution / 4) / tpb);
+
+    private static string Serialize(C2sChart chart)
+    {
+        var sb = new StringBuilder();
+        sb.AppendLine($"VERSION\t{chart.Version}");
+        sb.AppendLine($"MUSIC\t{chart.MusicId}");
+        sb.AppendLine("SEQUENCEID\t0");
+        sb.AppendLine($"DIFFICULT\t{chart.DifficultId:D2}");
+        sb.AppendLine("LEVEL\t0.0");
+        sb.AppendLine($"CREATOR\t{chart.Creator}");
+        sb.AppendLine($"BPM_DEF\t{Fmt(chart.DefBpm)}\t{Fmt(chart.DefBpm)}\t{Fmt(chart.DefBpm)}\t{Fmt(chart.DefBpm)}");
+        sb.AppendLine("MET_DEF\t4\t4");
+        sb.AppendLine($"RESOLUTION\t{chart.Resolution}");
+        sb.AppendLine($"CLK_DEF\t{chart.Resolution}");
+        sb.AppendLine("PROGJUDGE_BPM\t240.000");
+        sb.AppendLine("PROGJUDGE_AER\t0.999");
+        sb.AppendLine("TUTORIAL\t0");
+        sb.AppendLine();
+
+        foreach (var b in chart.BpmEvents)
+            sb.AppendLine($"BPM\t{b.Measure}\t{b.Offset}\t{Fmt(b.Bpm)}");
+        foreach (var m in chart.MetEvents)
+            sb.AppendLine($"MET\t{m.Measure}\t{m.Offset}\t{m.Denom}\t{m.Num}");
+        foreach (var s in chart.SflEvents)
+            sb.AppendLine($"SFL\t{s.Measure}\t{s.Offset}\t{s.Duration}\t{Mlt(s.Multiplier)}");
+        sb.AppendLine();
+
+        foreach (var n in chart.Notes.OrderBy(n => n.Measure * C2sResolution + n.Offset))
+            sb.AppendLine(FormatNote(n));
+
+        sb.AppendLine();
+        return sb.ToString();
+    }
+
+    private static string FormatNote(ChuNote n) => n.Type switch
+    {
+        "TAP" => $"TAP\t{n.Measure}\t{n.Offset}\t{n.Cell}\t{n.Width}",
+        "CHR" => $"CHR\t{n.Measure}\t{n.Offset}\t{n.Cell}\t{n.Width}\t{n.Extra}",
+        "HLD" or "HXD" => $"{n.Type}\t{n.Measure}\t{n.Offset}\t{n.Cell}\t{n.Width}\t{n.HoldDuration}",
+        "SLD" or "SLC" or "SXD" or "SXC" => $"{n.Type}\t{n.Measure}\t{n.Offset}\t{n.Cell}\t{n.Width}\t{n.SlideDuration}\t{n.EndCell}\t{n.EndWidth}",
+        "FLK" => $"FLK\t{n.Measure}\t{n.Offset}\t{n.Cell}\t{n.Width}\t{n.Extra}",
+        "AIR" or "AUR" or "AUL" or "ADW" or "ADR" or "ADL" => $"{n.Type}\t{n.Measure}\t{n.Offset}\t{n.Cell}\t{n.Width}\t{n.TargetNote}",
+        "AHD" => $"AHD\t{n.Measure}\t{n.Offset}\t{n.Cell}\t{n.Width}\t{n.TargetNote}\t{n.AirHoldDuration}",
+        "ALD" or "ASD" => $"{n.Type}\t{n.Measure}\t{n.Offset}\t{n.StartHeight}\t{n.SlideDuration}\t{n.EndCell}\t{n.EndWidth}\t{n.TargetHeight}\t{n.NoteColor}",
+        "MNE" => $"MNE\t{n.Measure}\t{n.Offset}\t{n.Cell}\t{n.Width}",
+        _ => $"TAP\t{n.Measure}\t{n.Offset}\t{n.Cell}\t{n.Width}"
+    };
+
+    private static string Fmt(double v) => v.ToString("0.000", CultureInfo.InvariantCulture);
+    private static string Mlt(double v) => v.ToString("0.000000", CultureInfo.InvariantCulture);
+}

generator/chu/SusGenerator.cs

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+using System.Text;
+using MuConvert.chart;
+using MuConvert.generator;
+using MuConvert.utils;
+using static MuConvert.utils.Alert.LEVEL;
+
+namespace MuConvert.chu;
+
+/**
+ * SUS 格式生成器。
+ * 输入 IChuChart，内部自动转换后输出 SUS 文本。
+ */
+public class SusGenerator : IGenerator<IChuChart>
+{
+    private const int SusTpb = 480;
+
+    public (string, List<Alert>) Generate(IChuChart chart)
+    {
+        var alerts = new List<Alert>();
+        var sus = ConvertToSus(chart, alerts);
+        var text = Serialize(sus);
+        return (text, alerts);
+    }
+
+    private static SusChart ConvertToSus(IChuChart chart, List<Alert> alerts)
+    {
+        if (chart is SusChart sus) return sus;
+
+        double bpm = 120.0;
+        string title = "", artist = "";
+
+        if (chart is C2sChart c2s)
+        {
+            bpm = c2s.BpmEvents.Count > 0 ? c2s.BpmEvents[0].Bpm : c2s.DefBpm;
+            int c2sTpb = c2s.Resolution / 4;
+            var result = new SusChart { Bpm = bpm, TicksPerBeat = SusTpb, Title = title, Artist = artist };
+            foreach (var n in c2s.Notes) result.Notes.Add(ScaleUp(n, c2sTpb));
+            return result;
+        }
+
+        if (chart is UgcChart ugc)
+        {
+            bpm = ugc.BpmEvents.Count > 0 ? ugc.BpmEvents[0].Bpm : 120.0;
+            var result = new SusChart { Bpm = bpm, TicksPerBeat = SusTpb, Title = ugc.Title, Artist = ugc.Artist };
+            foreach (var n in ugc.Notes) result.Notes.Add(ScaleUp(n, ugc.TicksPerBeat));
+            return result;
+        }
+
+        alerts.Add(new Alert(Error, string.Format(Locale.ChuGeneratorUnsupported, "→ SUS")));
+        throw new ConversionException(alerts);
+    }
+
+    private static ChuNote ScaleUp(ChuNote n, int sourceTicksPerBeat)
+    {
+        int s(int v) => (int)((long)v * SusTpb / sourceTicksPerBeat);
+        return new ChuNote
+        {
+            Type = n.Type, Measure = n.Measure, Offset = s(n.Offset),
+            Cell = n.Cell * 2, Width = n.Width * 2,
+            HoldDuration = s(n.HoldDuration), SlideDuration = s(n.SlideDuration),
+            EndCell = n.EndCell * 2, EndWidth = n.EndWidth * 2,
+            Extra = n.Extra, TargetNote = n.TargetNote, AirHoldDuration = s(n.AirHoldDuration),
+        };
+    }
+
+    private static string Serialize(SusChart sus)
+    {
+        var sb = new StringBuilder();
+        if (!string.IsNullOrEmpty(sus.Title)) sb.AppendLine($"#TITLE \"{sus.Title}\"");
+        if (!string.IsNullOrEmpty(sus.Artist)) sb.AppendLine($"#ARTIST \"{sus.Artist}\"");
+        if (!string.IsNullOrEmpty(sus.Designer)) sb.AppendLine($"#DESIGNER \"{sus.Designer}\"");
+        sb.AppendLine($"#BPM_DEF {sus.Bpm:F2}");
+        sb.AppendLine($"#REQUEST \"{sus.TicksPerBeat}\"");
+        sb.AppendLine();
+
+        foreach (var n in sus.Notes.OrderBy(n => n.Measure).ThenBy(n => n.Offset))
+            sb.AppendLine($"#{n.Measure:X2}{n.Offset:X3}:{FormatData(n)}");
+
+        return sb.ToString();
+    }
+
+    private static string FormatData(ChuNote n)
+    {
+        string lw = $"{n.Cell:X2}{n.Width:X2}";
+        string tc = TypeCode(n.Type);
+        string dur = $"{(n.HoldDuration > 0 ? n.HoldDuration : n.SlideDuration > 0 ? n.SlideDuration : n.AirHoldDuration):X4}";
+        return tc switch
+        {
+            "01" or "02" or "03" or "10" => $"{tc}{lw}",
+            "05" or "08" => $"{tc}{lw}{dur}",
+            "06" => $"{tc}{lw}{dur}{n.EndCell:X2}{n.EndWidth:X2}",
+            "07" or "09" => $"{tc}{lw}{n.TargetNote}",
+            _ => $"01{lw}"
+        };
+    }
+
+    private static string TypeCode(string t) => t switch
+    {
+        "TAP" => "01", "CHR" => "02", "FLK" => "03",
+        "HLD" => "05", "SLD" => "06", "SLC" => "06",
+        "AIR" => "07", "AUR" => "07", "AUL" => "07",
+        "AHD" => "08", "ADW" => "09", "ADR" => "09", "ADL" => "09",
+        "MNE" => "10", _ => "01"
+    };
+}