using System;
using System.Reactive.Linq;
using DynamicData;
using Intromat.Model.Compiler;
using Intromat.PersistentModel;
using Intromat.ViewModels;
using Intromat.ViewModels.Editors;
using Intromat.ViewModels.Previews;
using Intromat.Views;
using NodeNetwork.Toolkit.ValueNode;
using ReactiveUI;
using Splat;

namespace Intromat.Nodes.Code
{
    public class StringLiteralNode : CodeGenNodeViewModel
    {
        static StringLiteralNode()
        {
            Locator.CurrentMutable.Register(() => new CodeGenNodeView(), typeof(IViewFor<StringLiteralNode>));
        }

        public StringLiteralNode() : base(NodeType.Literal)
        {
            Name = "String";

            Output = new CodeGenOutputViewModel<ITypedExpression<string?>>(EPortType.String)
            {
                Name = "Value",
                Editor = ValueEditor,
                Value = ValueEditor.ValueChanged.Select(v => new StringLiteralValue { Value = v })
            };
            Outputs.Add(Output);

            var stringPreview = new StringPreviewViewModel();
            Preview = stringPreview;

            this.WhenAnyValue(vm => vm.Output.CurrentValue)
                .Where(v => v != null)
                .Subscribe(_ => stringPreview.Value = ((StringLiteralValue)Output.CurrentValue).Value ?? string.Empty);
        }

        public StringValueEditorViewModel ValueEditor { get; } = new();

        public ValueNodeOutputViewModel<ITypedExpression<string?>> Output { get; }

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

        public override void LoadModel(NodeModelBase model)
        {
            base.LoadModel(model);
            var textLiteral = (StringLiteralModel)model;
            ValueEditor.Value = textLiteral.Value;
        }

        public override void SaveModel(NodeModelBase model)
        {
            base.SaveModel(model);
            var textLiteral = (StringLiteralModel)model;
            textLiteral.Value = ValueEditor.Value;
        }
    }
}