first commit

Data/Song/Chart.cs

@@ -0,0 +1,25 @@
+using System;
+
+namespace MercuryConverter.Data;
+
+
+public class Chart
+{
+    public required string audioId;
+    public required string audioOffset;
+    public required string audioPreviewTime;
+    public required string audioPreviewDuration;
+    public required string video;
+    public required string designer;
+    public required string clearRequirement;
+    public required string diffLevel;
+    public string diffString
+    {
+        get
+        {
+            var d = Convert.ToDouble(diffLevel);
+            var i = (int)d;
+            return $"{(int)d}{(d > i ? "+" : "")}";
+        }
+    }
+}

Data/Song/Consts.cs

@@ -0,0 +1,38 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace MercuryConverter.Data;
+
+public static class Consts
+{
+    private static Dictionary<int, string> _CATEGORY_INDEX = new()
+    {
+        { -1, "Unknown"},
+        { 0, "Anime/Pop"},
+        { 1, "Vocaloid"},
+        { 2, "Touhou Project"},
+        { 3, "2.5D" },
+        { 4, "Variety" },
+        { 5, "Original" },
+        { 6, "HARDCORE TANO*C" },
+        { 7, "VTuber" },
+    };
+    public static readonly IReadOnlyDictionary<int, string> CATEGORY_INDEX = _CATEGORY_INDEX;
+
+    private static Dictionary<int, string> _NUM_SOURCE = new()
+    {
+        { 1, string.Concat(new int[] {87, 65, 67, 67, 65}.Select(i => Convert.ToChar(i))) },
+        { 2, string.Concat(new int[] {87, 65, 67, 67, 65, 32, 83}.Select(i => Convert.ToChar(i))) },
+        { 3, string.Concat(new int[] {87, 65, 67, 67, 65, 32, 76, 73, 76, 89}.Select(i => Convert.ToChar(i))) },
+        { 4, string.Concat(new int[] {87, 65, 67, 67, 65, 32, 76, 73, 76, 89, 32, 82}.Select(i => Convert.ToChar(i))) },
+        { 5, string.Concat(new int[] {87, 65, 67, 67, 65, 32, 82, 101, 118, 101, 114, 115, 101}.Select(i => Convert.ToChar(i))) }
+    };
+    public static readonly IReadOnlyDictionary<int, string> NUM_SOURCE = _NUM_SOURCE;
+    public static readonly IReadOnlyDictionary<string, int> SOURCE_NUM = _NUM_SOURCE.ToDictionary(p => p.Value, p=>p.Key);
+
+    private static string[] _DIFFICULTIES = {
+        "Normal", "Hard", "Expert", "Inferno"
+    };
+    public static readonly IReadOnlyList<string> DIFFICULTIES = _DIFFICULTIES;
+}

Data/Song/Song.cs

@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+using Avalonia.Media;
+
+namespace MercuryConverter.Data;
+
+public class Song
+{
+    /// <summary>
+    /// Format: `Snn-nnn` where `n` is a digit.
+    /// </summary>
+    public required string id;
+    public required string name;
+    public required string rubi;
+    public required string artist;
+    public required string copyright;
+    public required string tempo;
+    public required string version;
+    public required int genreId;
+    public required string game;
+    public required string jacket;
+    public Chart?[] charts = { null, null, null, null };
+}