using System.Collections.Generic;

using System.Reactive;

using System.Reactive.Linq;

using DesertPaintCodex.Services;

using ReactiveUI;

namespace DesertPaintCodex.ViewModels

{

    public class RecipeLibraryViewModel : ViewModelBase

    {

        private string _profileName = string.Empty;

        public string ProfileName { get => _profileName; set => this.RaiseAndSetIfChanged(ref _profileName, value); }

        private readonly ObservableAsPropertyHelper<bool> _duplicateWarning;

        public bool DuplicateWarning => _duplicateWarning.Value;

        public RecipeLibraryViewModel()

        {

            List<string> profiles = ProfileManager.GetProfileList();

            // TODO .....

            // Duplicate warning display logic.

            this.WhenAnyValue(x => x.ProfileName)

                .Select(profileName =>

                    (!string.IsNullOrWhiteSpace(profileName) &&

                    profiles.Contains(profileName)))

                    .ToProperty(this,

                        x => x.DuplicateWarning,

                        out _duplicateWarning);

            // TODO: Use proper validation to decorate the TextBox, as well.

            // OK button enabling logic.

            var okEnabled = this.WhenAnyValue(

               x => x.ProfileName,

               x => !string.IsNullOrWhiteSpace(x) &&

                    !profiles.Contains(x));

            // Button commands.

            Cancel = ReactiveCommand.Create(() => { });

            Ok = ReactiveCommand.Create(() => {

                ProfileManager.CreateNewProfile(_profileName);

            }, okEnabled);

        }

        public ReactiveCommand<Unit, Unit> Cancel { get; }

        public ReactiveCommand<Unit, Unit> Ok { get; }

    }

}