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),
    };
}