using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.BL;
using Tango.BL.Builders;
using Tango.BL.Entities;
using Tango.MachineStudio.Common;
using Tango.MachineStudio.Common.Notifications;

namespace Tango.MachineStudio.RML.ViewModels
{
    public class MainViewVM : StudioViewModel
    {
        private INotificationProvider _notification;

        private ObservablesContext _rmls_context;
        private ObservablesContext _active_context;

        private ObservableCollection<Rml> _rmls;
        public ObservableCollection<Rml> Rmls
        {
            get { return _rmls; }
            set { _rmls = value; RaisePropertyChangedAuto(); }
        }

        private Rml _selectedRML;
        public Rml SelectedRML
        {
            get { return _selectedRML; }
            set { _selectedRML = value; RaisePropertyChangedAuto(); OnSelectedRmlChanged(); }
        }

        private Rml _activeRML;
        public Rml ActiveRML
        {
            get { return _activeRML; }
            set { _activeRML = value; RaisePropertyChangedAuto(); }
        }

        public MainViewVM(INotificationProvider notificationProvider)
        {
            _notification = notificationProvider;
        }

        public override void OnApplicationReady()
        {
            LoadRmls();
        }

        private void LoadRmls()
        {
            using (_rmls_context = ObservablesContext.CreateDefault())
            {
                Rmls = _rmls.ToList().ToObservableCollection();
            }
        }

        private void OnSelectedRmlChanged()
        {
            if (SelectedRML != null)
            {
                LoadActiveRML(SelectedRML.Guid);
            }
            else
            {
                UnloadActiveRML();
            }
        }

        private void UnloadActiveRML()
        {
            ActiveRML = null;
        }

        private async void LoadActiveRML(String guid)
        {
            using (_notification.PushTaskItem("Loading RML..."))
            {
                if (_active_context != null)
                {
                    _active_context.Dispose();
                }

                _active_context = ObservablesContext.CreateDefault();

                ActiveRML = await new RmlBuilder(_active_context)
                    .Set(guid)
                    .WithAllParametersGroup()
                    .WithCCT()
                    .WithLiquidFactors()
                    .BuildAsync();
            }
        }
    }
}