final

BlueLaminate/BlueLaminate.Core/Tradeups/WearBand.cs

@@ -0,0 +1,58 @@
+namespace BlueLaminate.Core.Tradeups;
+
+/// <summary>
+/// The five CS2 wear bands, defined by absolute float thresholds (independent of any
+/// individual skin's float range). A produced item's band — and therefore which
+/// listings it competes with — is read straight off its absolute float.
+/// </summary>
+public enum WearBand
+{
+    FactoryNew,
+    MinimalWear,
+    FieldTested,
+    WellWorn,
+    BattleScarred,
+}
+
+public static class WearBands
+{
+    // Upper-exclusive boundaries: FN [0,0.07) MW [0.07,0.15) FT [0.15,0.38)
+    // WW [0.38,0.45) BS [0.45,1.0].
+    public const decimal MinimalWearFloor = 0.07m;
+    public const decimal FieldTestedFloor = 0.15m;
+    public const decimal WellWornFloor = 0.38m;
+    public const decimal BattleScarredFloor = 0.45m;
+
+    /// <summary>The wear band an absolute float value falls into.</summary>
+    public static WearBand FromFloat(decimal floatValue) => floatValue switch
+    {
+        < MinimalWearFloor => WearBand.FactoryNew,
+        < FieldTestedFloor => WearBand.MinimalWear,
+        < WellWornFloor => WearBand.FieldTested,
+        < BattleScarredFloor => WearBand.WellWorn,
+        _ => WearBand.BattleScarred,
+    };
+
+    /// <summary>The absolute float range [min, max) that defines this band — used to scope a
+    /// CSFloat query to the band the produced output lands in.</summary>
+    public static (decimal Min, decimal Max) Bounds(this WearBand band) => band switch
+    {
+        WearBand.FactoryNew => (0.00m, MinimalWearFloor),
+        WearBand.MinimalWear => (MinimalWearFloor, FieldTestedFloor),
+        WearBand.FieldTested => (FieldTestedFloor, WellWornFloor),
+        WearBand.WellWorn => (WellWornFloor, BattleScarredFloor),
+        WearBand.BattleScarred => (BattleScarredFloor, 1.00m),
+        _ => throw new ArgumentOutOfRangeException(nameof(band), band, null),
+    };
+
+    /// <summary>The full wear name as it appears in listing data ("Factory New", …).</summary>
+    public static string ToName(this WearBand band) => band switch
+    {
+        WearBand.FactoryNew => "Factory New",
+        WearBand.MinimalWear => "Minimal Wear",
+        WearBand.FieldTested => "Field-Tested",
+        WearBand.WellWorn => "Well-Worn",
+        WearBand.BattleScarred => "Battle-Scarred",
+        _ => throw new ArgumentOutOfRangeException(nameof(band), band, null),
+    };
+}