using System;
using System.IO;
using System.Reactive.Linq;
using DynamicData;
using Intromat.Interfaces;
using Intromat.Nodes;
using ReactiveUI;

namespace Intromat.ViewModels
{
    public class ModuleViewModel : FolderViewModel, IFile
    {
        private bool _isDirty;

        public ModuleViewModel(ProjectViewModel parent, string name, string fullPath)
            : base(null, parent, name)
        {
            FullPath = fullPath;
            _isExpanded = true;

            this.WhenAnyValue(vm => vm.Parent)
                .Buffer(2, 1)
                .Select(b => (Previous: b[0], Current: b[1]))
                .Subscribe(t =>
                {
                    ((ProjectViewModel)t.Previous).Modules.Remove(this);
                    ((ProjectViewModel)t.Current).Modules.Remove(this);
                });
        }

        public static ModuleViewModel CreateDefault(MainViewModel mainVm, ProjectViewModel parent, string fullPath)
        {
            var module = new ModuleViewModel(parent, Path.GetFileName(fullPath)!, fullPath);
            var mainDocument = DocumentViewModel.CreateDefault(mainVm, module, module, "Main");
            module.Files.Add(mainDocument);
            module.Files.Add(ShaderFileViewModel.CreateDefault(mainVm, module, module, "Code"));
            var entryPoint = new MainEntryPointNode { CanBeRemovedByUser = false };
            mainDocument.MainNetwork.Nodes.Add(entryPoint);
            return module;
        }

        public override string FullPath { get; }

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