using System;
using System.Reactive.Linq;
using Intromat.PersistentModel;
using Intromat.PersistentModel.Nodes;
using Intromat.Views;
using NodeNetwork.Toolkit.Group.AddEndpointDropPanel;
using NodeNetwork.ViewModels;
using ReactiveUI;
using Splat;

namespace Intromat.ViewModels.Nodes
{
    public class GroupSubnetIONodeViewModel : CodeGenNodeViewModel
    {
        private CodeNodeGroupIOBinding? _ioBinding;
        private bool _isEntranceNode;

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

        public GroupSubnetIONodeViewModel()
            : base(NodeType.Group)
        {
            this.WhenAnyValue(vm => vm.IsEntranceNode)
                .StartWith(false)
                .Subscribe(isEntrance => Name = isEntrance ? "Group Input" : "Group Output");
        }

        public NetworkViewModel? Subnet { get; set; }

        public AddEndpointDropPanelViewModel? AddEndpointDropPanelVM { get; set; }

        public bool IsEntranceNode 
        { 
            get => _isEntranceNode; 
            set => this.RaiseAndSetIfChanged(ref _isEntranceNode, value);
        }

        public CodeNodeGroupIOBinding? IOBinding
        {
            get => _ioBinding;
            set
            {
                if (_ioBinding != null)
                    throw new InvalidOperationException("IOBinding is already set.");

                _ioBinding = value;

                AddEndpointDropPanelVM = new AddEndpointDropPanelViewModel(IsEntranceNode, !IsEntranceNode) { NodeGroupIOBinding = IOBinding };
            }
        }

        public override NodeModelBase CreateModel()
        {
            return new GroupSubnetIOModel();
        }

        public override void LoadModel(NodeModelBase model)
        {
            base.LoadModel(model);
            var groupSubnetIO = (GroupSubnetIOModel)model;
            IsEntranceNode = groupSubnetIO.IsEntrance;
        }

        public override void SaveModel(NodeModelBase model)
        {
            base.SaveModel(model);
            var groupSubnetIO = (GroupSubnetIOModel)model;
            groupSubnetIO.IsEntrance = IsEntranceNode;
        }
    }
}