namespace ExcelKv.Core.Units;

public enum UnitCategory
{
    None = 0,
    Length,
    Area,
    Volume,
    Weight,
    Count, // ex: EA, Set
    Time   // ex: Hour, Day
}

public enum SiUnit
{
    // Default
    None = 0,

    // Length (Base: Meter)
    Meter = 100,
    Millimeter = 101,
    Centimeter = 102,
    Kilometer = 103,

    // Area (Base: SquareMeter)
    SquareMeter = 200,
    Hectare = 201,

    // Volume (Base: CubicMeter)
    CubicMeter = 300,
    Liter = 301,

    // Weight/Mass (Base: Kilogram)
    Kilogram = 400,
    Ton = 401,
    Gram = 402,

    // Count
    Each = 900,
    Set = 901
}

public static class SiUnitExtensions 
{
    public static UnitCategory GetCategory(this SiUnit unit)
    {
        int id = (int)unit;
        if (id >= 100 && id < 200) return UnitCategory.Length;
        if (id >= 200 && id < 300) return UnitCategory.Area;
        if (id >= 300 && id < 400) return UnitCategory.Volume;
        if (id >= 400 && id < 500) return UnitCategory.Weight;
        if (id >= 900 && id < 1000) return UnitCategory.Count;
        return UnitCategory.None;
    }

    public static string ToSymbol(this SiUnit unit) => unit switch
    {
        SiUnit.Meter => "m",
        SiUnit.Millimeter => "mm",
        SiUnit.Centimeter => "cm",
        SiUnit.Kilometer => "km",
        SiUnit.SquareMeter => "m2",
        SiUnit.CubicMeter => "m3",
        SiUnit.Kilogram => "kg",
        SiUnit.Ton => "ton",
        SiUnit.Each => "EA",
        _ => ""
    };
}