using MaterialDesignThemes.Wpf;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Tango.FSE.Common.Notifications
{
    public class InputBoxVM : MessageBoxVM
    {
        public PackIconKind Icon { get; set; }
        public String InputHint { get; set; }

        public int MaxCharacters { get; set; }

        internal Func<String,String> ValidationFunction { get; set; }

        private String _input;
        public String Input
        {
            get { return _input; }
            set
            {
                _input = value;
                RaisePropertyChangedAuto();

                if (_input.IsNotNullOrEmpty())
                {
                    if (ValidationFunction != null)
                    {
                        Error = ValidationFunction.Invoke(_input);
                    }
                }
                else
                {
                    Error = null;
                }

                RaisePropertyChanged(nameof(HasValidationError));

                InvalidateRelayCommands();
            }
        }

        public bool HasValidationError
        {
            get { return !String.IsNullOrWhiteSpace(Error); }
        }

        private String _error;
        public String Error
        {
            get { return _error; }
            set { _error = value; RaisePropertyChangedAuto(); }
        }

        public InputBoxVM() : base()
        {
            HasCancel = true;
        }

        protected override bool CanOK()
        {
            return base.CanOK() && Input.IsNotNullOrEmpty() && !HasValidationError;
        }
    }
}