using BeWo.ServiceProxy;
using BeWo.ViewModel.ListViewModel;
using BS.Shared.DataContracts.Feature.AI;
using DevExpress.Mvvm;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;

namespace BeWo.ViewModel.View.Administration
{
	public class AiPromptbausteinRoutineViewModel : AcceptCancelDialogViewModel<AiPromptbausteinRoutineDC, AiPromptbausteinRoutineVM>
	{
		private readonly bool _IsNew;
		public AiPromptbausteinRoutineStepVM _SelectedStep;

		public AiPromptbausteinFolderListVM FolderListVM { get; set; }

		public ICommand DeleteStepCommand { get; private set; }
		public ICommand MoveStepUpCommand { get; private set; }
		public ICommand MoveStepDownCommand { get; private set; }

		public AiPromptbausteinRoutineStepVM SelectedStep
		{
			get => _SelectedStep;
			set => SetProperty(ref _SelectedStep, value, nameof(SelectedStep));
		}

		public AiPromptbausteinRoutineViewModel(AiPromptbausteinRoutineVM viewModel, AiPromptbausteinFolderListVM folders) : base(viewModel)
		{
			FolderListVM = folders;

			ViewModel.Steps.VMList.ListChanged += (s, e) =>
			{
				SaveCommand.RaiseCanExecuteChanged();
			};

			DeleteStepCommand = new DelegateCommand<AiPromptbausteinRoutineStepVM>(DeleteStep, canDeleteStep);
			MoveStepUpCommand = new DelegateCommand<AiPromptbausteinRoutineStepVM>(MoveStepUp, canMoveStepUp);
			MoveStepDownCommand = new DelegateCommand<AiPromptbausteinRoutineStepVM>(MoveStepDown, canMoveStepDown);
		}

		void DeleteStep(AiPromptbausteinRoutineStepVM step)
		{
			ViewModel.Steps.VMList.Remove(step);
		}

		void MoveStepUp(AiPromptbausteinRoutineStepVM step)
		{
			swap(step, -1);
		}

		void MoveStepDown(AiPromptbausteinRoutineStepVM step)
		{
			swap(step, 1);
		}
		
		bool canDeleteStep(AiPromptbausteinRoutineStepVM step)
		{
			return step is object;
		}

		bool canMoveStepUp(AiPromptbausteinRoutineStepVM step)
		{
			return step is object && ViewModel.Steps.Count > 1 && ViewModel.Steps.VMList.First() != step;
		}

		bool canMoveStepDown(AiPromptbausteinRoutineStepVM step)
		{
			return step is object && ViewModel.Steps.Count > 1 && ViewModel.Steps.VMList.Last() != step;
		}

		protected override bool canSave()
		{
			return base.canSave() && !string.IsNullOrWhiteSpace(ViewModel.Title) && (ViewModel.Steps?.VMList.Any() ?? false);
		}

		protected override void Save()
		{
			var dc = ViewModel.CommitToDataContract();

			if (ViewModel.IsNew)
			{
				ServiceFacade.DoAiEnhancedServiceAsnyc(x => x.InsertAiPromptbausteinRoutine(dc),
						DataSave);
			}
			else
			{
				ServiceFacade.DoAiEnhancedServiceAsnyc(x => x.UpdateAiPromptbausteinRoutine(dc),
						DataSave);
			}
		}

		private void swap(AiPromptbausteinRoutineStepVM step_x, int offset_y)
		{
			var id_x = ViewModel.Steps.VMList.IndexOf(step_x);
			var id_y = id_x + offset_y;
			var step_y = ViewModel.Steps.VMList[id_y];

			var prompt_x = step_x.PromptReference;
			var version_x = step_x.ReferenceVersion;
			var valid_x = step_x.IsValid;

			var prompt_y = step_y.PromptReference;
			var version_y = step_y.ReferenceVersion;
			var valid_y = step_y.IsValid;

			step_x.PromptReference = prompt_y;
			step_x.ReferenceVersion = version_y;
			step_x.SetIsValid(valid_y);

			step_y.PromptReference = prompt_x;
			step_y.ReferenceVersion = version_x;
			step_y.SetIsValid(valid_x);

			SelectedStep = step_y;
		}
	}
}