using System;
using System.Diagnostics;
using DynamicData;
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 GroupNodeViewModel : CodeGenNodeViewModel
    {
        private CodeNodeGroupIOBinding? _ioBinding;

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

        public GroupNodeViewModel()
            : base(NodeType.Group)
        {
        }

        public NetworkViewModel? Subnet { get; set; }

        public AddEndpointDropPanelViewModel? AddEndpointDropPanelVM { get; private set; }

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

                _ioBinding = value;

                AddEndpointDropPanelVM = new AddEndpointDropPanelViewModel { NodeGroupIOBinding = IOBinding };
            }
        }

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

        public override void SaveModel(NodeModelBase model)
        {
            Debug.Assert(Subnet != null, nameof(Subnet) + " != null");
            Debug.Assert(IOBinding != null, nameof(IOBinding) + " != null");
            
            base.SaveModel(model);
            var group = (GroupModel)model;
            var network = ProjectSerializer.SaveModel((CodeGenNetworkViewModel)Subnet);
            group.Network = network;
            foreach (var input in Inputs.Items)
            {
                var endpointType = input.GetType().GenericTypeArguments[0];
                var list = endpointType.IsGenericType && typeof(IObservableList<>) == endpointType.GetGenericTypeDefinition();
                if (list)
                    endpointType = endpointType.GenericTypeArguments[0];

                group.Inputs.Add(new GroupEndpointModel
                {
                    Name = input.Name,
                    EndpointType = endpointType.ToString(),
                    SortIndex = input.SortIndex,
                    PortType = ((CodeGenPortViewModel)input.Port).PortType,
                    List = list
                });
            }
            foreach (var output in Outputs.Items)
            {
                var endpointType = output.GetType().GenericTypeArguments[0];
                var list = endpointType.IsGenericType && typeof(IObservableList<>) == endpointType.GetGenericTypeDefinition();
                if (list)
                    endpointType = endpointType.GenericTypeArguments[0];

                group.Outputs.Add(new GroupEndpointModel
                {
                    Name = output.Name,
                    EndpointType = endpointType.ToString(),
                    SortIndex = output.SortIndex,
                    PortType = ((CodeGenPortViewModel)output.Port).PortType,
                    List = list
                });
            }
        }
    }
}