add chartinfo implementation

src/Data/Database.cs

@@ -80,7 +80,7 @@ public static class Database
 
                     // TODO: check audio existence; add warning but don't skip
 
-                    song.Levels[(int)diff] = lvl;
+                    song.Levels[(int)diff] = (lvl, data[Consts.DIFF_DESIGNER_KEY[diff]].ToString()!);
                 }
 
                 Dispatcher.UIThread.Post(() => Songs.Add(song));

src/Data/Song/Consts.cs

@@ -58,4 +58,12 @@ public static class Consts
         {Difficulty.Inferno, "ClearNormaRateInferno"},
     };
     public static readonly IReadOnlyDictionary<Difficulty, string> DIFF_CLEAR_KEY = _DIFF_CLEAR_KEY;
+
+    public static readonly IReadOnlyDictionary<Difficulty, string> DIFF_DESIGNER_KEY = new Dictionary<Difficulty, string>()
+    {
+        {Difficulty.Normal, "NotesDesignerNormal"},
+        {Difficulty.Hard, "NotesDesignerHard"},
+        {Difficulty.Expert, "NotesDesignerExpert"},
+        {Difficulty.Inferno, "NotesDesignerInferno"},
+    };
 }

src/Data/Song/Song.cs

@@ -22,7 +22,7 @@ public class Song
     public required float PreviewTime { get; set; }
     public required float PreviewLen { get; set; }
     public string SourceName => Consts.NUM_SOURCE[Source];
-    public float?[] Levels { get; set; } = { null, null, null, null };
+    public (float, string)?[] Levels { get; set; } = { null, null, null, null };
     
 
     // TODO: For SaturnData.Entry instances, use this Guid format:

src/UI/Views/Selection/ChartInfo.axaml

@@ -0,0 +1,19 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+            xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+            xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+            xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+            xmlns:local="clr-namespace:MercuryConverter.UI.Views"
+            x:Class="MercuryConverter.UI.Views.ChartInfo">
+    <StackPanel Margin="0 0 0 12">
+            <Canvas Width="150" Height="32">
+                <Rectangle Name="ShapeBase" Width="118" Height="32" Canvas.Left="16"/>
+                <Ellipse Name="ShapeLeftRound" Width="32" Height="32" Canvas.Left="0" Canvas.Top="0"/>
+                <Ellipse Name="ShapeRightRound" Width="32" Height="32" Canvas.Right="0" Canvas.Top="0"/>
+                <Polygon Name="ShapeDiagonal" Points="0,32 16,0 45,0 50,32" Canvas.Top="0" Canvas.Right="16"/>
+                <TextBlock Name="LevelNoTxt" Text="14+" Canvas.Right="8" Canvas.Top="4" Foreground="White" FontSize="20" FontWeight="Bold"/>
+                <TextBlock Name="LevelNameTxt" Text="INFERNO" Canvas.Left="12" Canvas.Top="6" Foreground="White" FontSize="16" FontWeight="Bold"/>
+            </Canvas>
+
+            <TextBlock Name="DesignerTxt" Text="muskit" HorizontalAlignment="Center"/>
+    </StackPanel>
+</UserControl>

src/UI/Views/Selection/ChartInfo.axaml.cs

@@ -0,0 +1,36 @@
+using System.Collections.Generic;
+using Avalonia.Controls;
+using Avalonia.Media;
+using MercuryConverter.Data;
+using SaturnData.Notation.Core;
+
+namespace MercuryConverter.UI.Views;
+
+public partial class ChartInfo : UserControl
+{
+    private static readonly IReadOnlyDictionary<Difficulty, (Color, Color)> COLORS = new Dictionary<Difficulty, (Color, Color)>(){
+        {Difficulty.Normal, (new Color(0xff, 0x1b, 0x7c, 0xff), new Color(0xff, 0x3f, 0x66, 0xfa))},
+        {Difficulty.Hard, (new Color(0xff, 0xFF, 0xC3, 0x00), new Color(0xff, 0xFF, 0xA0, 0x00))},
+        {Difficulty.Expert, (new Color(0xff, 0xFF, 0x00, 0x84), new Color(0xff, 0xCF, 0x00, 0x5B))},
+        {Difficulty.Inferno, (new Color(0xff, 0x40, 0x00, 0x43), new Color(0xff, 0x1F, 0x00, 0x20))}
+    };
+
+    public ChartInfo(Song song, Difficulty diff = Difficulty.Inferno)
+    {
+        InitializeComponent();
+
+        var colLight = COLORS[diff].Item1;
+        var colDark = COLORS[diff].Item2;
+        ShapeBase.Fill = new SolidColorBrush(colLight);
+        ShapeLeftRound.Fill = new SolidColorBrush(colLight);
+        ShapeRightRound.Fill = new SolidColorBrush(colDark);
+        ShapeDiagonal.Fill = new SolidColorBrush(colDark);
+
+        var l = song.Levels[(int)diff]!;
+        var level = l.Value.Item1;
+        var designer = l.Value.Item2;
+        LevelNoTxt.Text = $"{(int)level}{(level - (int)level >= 0.7f ? "+" : "")}";
+        LevelNameTxt.Text = diff.ToString().ToUpper();
+        DesignerTxt.Text = designer;
+    }
+}

src/UI/Views/Selection/Selection.axaml

@@ -23,6 +23,8 @@
                     <TextBlock Name="InfoNameText" Text="Name" FontWeight="Bold" HorizontalAlignment="Center" Margin="0 10 0 0"/>
                     <TextBlock Name="InfoArtistText" Text="Artist" HorizontalAlignment="Center"/>
                     <TextBlock Name="InfoSourceText" Text="Source" HorizontalAlignment="Center"/>
+                    <StackPanel Name="ChartInfoGroup" Margin="0 36 0 0">
+                    </StackPanel>
                 </StackPanel>
             </TabItem>
             <TabItem Header="Filters" FontSize="16">

src/UI/Views/Selection/Selection.axaml.cs

@@ -10,6 +10,7 @@ using Avalonia.Threading;
 using Avalonia.Media;
 using System.IO;
 using Avalonia.Media.Imaging;
+using SaturnData.Notation.Core;
 
 namespace MercuryConverter.UI.Views;
 
@@ -63,6 +64,20 @@ public partial class Selection : Panel
                 InfoNameText.Text = song.Name;
                 InfoArtistText.Text = song.Artist;
                 InfoSourceText.Text = song.SourceName;
+
+                ChartInfoGroup.Children.Clear();
+                foreach (Difficulty diff in Enum.GetValues(typeof(Difficulty)))
+                {
+                    // skip non-canon difficulties
+                    if (diff == Difficulty.None || diff == Difficulty.WorldsEnd) continue;
+
+                    var idx = (int)diff;
+                    var level = song.Levels[idx];
+                    if (level == null) continue;
+
+                    var ci = new ChartInfo(song, diff);
+                    ChartInfoGroup.Children.Add(ci);
+                }
             });
         }
     }