using System.Diagnostics.CodeAnalysis;
using InnovEnergy.Lib.Units;
using InnovEnergy.Lib.Utils;


namespace InnovEnergy.App.SaliMax;

public static class Flow
{
    private static readonly String RightArrowChar   = ">";
    private static readonly String LeftArrowChar    = "<";
    private static readonly String DownArrowChar    = "V";
    private static readonly String UpArrowChar      = "^";
    private static readonly String UnknownArrowChar = "?";

    public static TextBlock Horizontal(Unit? amount) => Horizontal(amount, 10);

    public static TextBlock Horizontal(Unit? amount, Int32 width)
    {
        var label = amount?.ToDisplayString() ?? "";
        
        var arrowChar = amount switch
        {
            { Value: < 0  } => LeftArrowChar,
            { Value: >= 0 } => RightArrowChar,
            _               => UnknownArrowChar,
        };
        
        //var arrowChar = amount.Value < 0 ? LeftArrowChar : RightArrowChar;
        var arrow     = Enumerable.Repeat(arrowChar, width).Join();

        // note : appending "fake label" below to make it vertically symmetric
        return TextBlock.AlignCenterHorizontal(label, arrow, ""); 
    }

    public static TextBlock Vertical(Unit? amount) => Vertical(amount, 4);

    [SuppressMessage("ReSharper", "PossibleMultipleEnumeration")]
    [SuppressMessage("ReSharper", "CoVariantArrayConversion")]
    public static TextBlock Vertical(Unit? amount, Int32 height)
    {
        var label     = amount?.ToDisplayString() ?? UnknownArrowChar;
        var arrowChar = amount switch
        {
            { Value: < 0  } => UpArrowChar,
            { Value: >= 0 } => DownArrowChar,
            _               => UnknownArrowChar,
        };
        
        // var arrowChar =  amount is null ? UnknownArrowChar
        //                : amount.Value < 0 ? UpArrowChar 
        //                : DownArrowChar;
        
        return TextBlock.AlignCenterHorizontal(arrowChar, arrowChar, label, arrowChar, arrowChar);
    }
}