using System;
using Intromat.Nodes.Code;
using Intromat.Views.Editors;
using ReactiveUI;
using Splat;

namespace Intromat.ViewModels.Editors
{
    public class IntegerExpressionEditorViewModel : ExpressionEditorBaseViewModel<int, IntLiteralValue, IntLiteralModel>
    {
        private int _maxValue;
        private int _minValue;

        static IntegerExpressionEditorViewModel()
        {
            Locator.CurrentMutable.Register(() => new IntegerExpressionEditorView(), typeof(IViewFor<IntegerExpressionEditorViewModel>));
        }

        public IntegerExpressionEditorViewModel()
        {
            this.WhenAnyValue(vm => vm.CustomValue)
                .Subscribe(newValue =>
                {
                    if (newValue > MaxValue)
                    {
                        var delta = newValue - MinValue;
                        MaxValue = newValue + delta;
                    }
                    else if (newValue < MinValue)
                    {
                        var delta = MaxValue - newValue;
                        MinValue = newValue - delta;
                    }
                });
        }

        public int MinValue
        {
            get => _minValue;
            set => this.RaiseAndSetIfChanged(ref _minValue, value);
        }

        public int MaxValue
        {
            get => _maxValue;
            set => this.RaiseAndSetIfChanged(ref _maxValue, value);
        }
    }
}