inabox/InABox.Avalonia/DataModels/ShellColumns.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using InABox.Core;

namespace InABox.Avalonia
{
    public class ShellColumns<TParent,TEntity> : IShellColumns<TEntity> where TEntity : Entity
    {
        
        private static Dictionary<string, Tuple<int,Expression<Func<TEntity, object?>>>> _columns = new Dictionary<string, Tuple<int,Expression<Func<TEntity, object?>>>> ();

        public int IndexOf(string name) => _columns[name].Item1;
        
        public Expression<Func<TEntity, object?>> this[string name] => _columns[name].Item2;

        public ShellColumns<TParent,TEntity> Map(string property, Expression<Func<TEntity, object?>> expression)
        {
            int iCol = _columns.Keys.Count;
            bool bFound = _columns.TryGetValue(property, out var column);
            try
            {
                if (bFound)
                    iCol = column.Item1;
            }
            catch (Exception e)
            {
                
            }
            
            _columns[property] = new Tuple<int, Expression<Func<TEntity, object?>>>(iCol, expression);
            //_columns[property] = new Tuple<int, Expression<Func<TEntity, object>>>(_columns.Keys.Count, expression);
            return this;
        }

        public Columns<TEntity> Columns => new Columns<TEntity>(ColumnTypeFlags.None).Add(_columns.Select(x => x.Value.Item2).ToArray());
        
        public int Count => _columns.Count;

    }
}