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

namespace Tango.MachineStudio.Logging.ViewModels
{
    public class MainViewVM : ViewModel
    {
        private INotificationProvider _notification;
        private IEventLogger _eventLogger;
        private DateVM _realTimeDate;
        private ObservableCollection<MachinesEvent> _realTimeEvents;

        private Machine _selectedMachine;
        public Machine SelectedMachine
        {
            get { return _selectedMachine; }
            set { _selectedMachine = value; RaisePropertyChangedAuto(); OnSelectedMachineChanged(); }
        }

        private ObservableCollection<MachinesEvent> _events;
        public ObservableCollection<MachinesEvent> Events
        {
            get { return _events; }
            set { _events = value; RaisePropertyChangedAuto(); }
        }

        private MachinesEvent _selectedEvent;
        public MachinesEvent SelectedEvent
        {
            get { return _selectedEvent; }
            set { _selectedEvent = value; RaisePropertyChangedAuto(); OnSelectedEventChanged(); }
        }

        private ObservableCollection<DateVM> _dates;
        public ObservableCollection<DateVM> Dates
        {
            get { return _dates; }
            set { _dates = value; RaisePropertyChangedAuto(); }
        }

        private DateVM _selectedDate;
        public DateVM SelectedDate
        {
            get { return _selectedDate; }
            set { _selectedDate = value; RaisePropertyChangedAuto(); OnSelectedDateChanged(); }
        }

        public MainViewVM(INotificationProvider notification, IEventLogger eventLogger)
        {
            _notification = notification;
            _eventLogger = eventLogger;
            _realTimeDate = new DateVM(DateTime.Now) { Description = "Real Time" };
            _realTimeEvents = new ObservableCollection<MachinesEvent>();
            _eventLogger.NewLog += _eventLogger_NewLog;
        }

        private void _eventLogger_NewLog(object sender, MachinesEvent machineEvent)
        {
            _realTimeEvents.Add(machineEvent);
        }

        private void OnSelectedMachineChanged()
        {
            if (SelectedMachine != null)
            {
                Dates = new ObservableCollection<DateVM>();
                Dates.Add(_realTimeDate);

                foreach (var day in SelectedMachine.MachinesEvents.GroupBy(x => x.DateTime.DayOfYear).Select(x => x.First().DateTime).OrderByDescending(x => x))
                {
                    Dates.Add(new DateVM(day));
                }

                SelectedDate = Dates.First();
            }
        }

        private void OnSelectedDateChanged()
        {
            if (SelectedDate != null)
            {
                if (SelectedDate == _realTimeDate)
                {
                    Events = _realTimeEvents;
                }
                else
                {
                    Events = SelectedMachine.MachinesEvents.Where(x => x.DateTime.DayOfYear == SelectedDate.Date.DayOfYear).OrderByDescending(x => x.DateTime).ToObservableCollection();
                }
            }
        }

        private void OnSelectedEventChanged()
        {
            if (SelectedEvent != null)
            {
                _notification.ShowInfo(SelectedEvent.Description);
            }
        }
    }
}