using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.BL;
using Tango.BL.Entities;
using Tango.Core.Commands;
using Tango.MachineStudio.Common.Diagnostics;
using Tango.MachineStudio.Common.Notifications;
using Tango.MachineStudio.Common.StudioApplication;
using Tango.SharedUI;
using System.Data.Entity;

namespace Tango.MachineStudio.UI.ViewModels
{
    public class ConnectedMachineViewVM : DialogViewVM
    {
        public enum ConnectedMachineVMResult
        {
            Cancel,
            Disconnect,
            UploadHardwareConfig,
            Reset,
            TurnOffHeaters
        }

        private IStudioApplicationManager _applicationManager;
        public IStudioApplicationManager ApplicationManager
        {
            get { return _applicationManager; }
            set { _applicationManager = value; RaisePropertyChangedAuto(); }
        }

        public ConnectedMachineVMResult Result { get; set; }

        private IDiagnosticsFrameProvider _diagnosticsFrameProvider;
        public IDiagnosticsFrameProvider DiagnosticsFrameProvider
        {
            get { return _diagnosticsFrameProvider; }
            set { _diagnosticsFrameProvider = value; RaisePropertyChangedAuto(); }
        }

        private String _totalMachineWorkTime;
        public String TotalMachineWorkTime
        {
            get { return _totalMachineWorkTime; }
            set { _totalMachineWorkTime = value; RaisePropertyChangedAuto(); }
        }

        private String _totalMachineMeters;
        public String TotalMachineMeters
        {
            get { return _totalMachineMeters; }
            set { _totalMachineMeters = value; RaisePropertyChangedAuto(); }
        }

        public RelayCommand DisconnectCommand { get; set; }

        public RelayCommand UploadHardwareConfigurationCommand { get; set; }

        public RelayCommand ResetCommand { get; set; }

        public RelayCommand TurnOffHeatersCommand { get; set; }

        public ConnectedMachineViewVM(IStudioApplicationManager application, IDiagnosticsFrameProvider frameProvider)
        {
            ApplicationManager = application;
            DisconnectCommand = new RelayCommand(() => AcceptResult(ConnectedMachineVMResult.Disconnect));
            UploadHardwareConfigurationCommand = new RelayCommand(() => AcceptResult(ConnectedMachineVMResult.UploadHardwareConfig));
            ResetCommand = new RelayCommand(() => AcceptResult(ConnectedMachineVMResult.Reset));
            TurnOffHeatersCommand = new RelayCommand(() => AcceptResult(ConnectedMachineVMResult.TurnOffHeaters));

            DiagnosticsFrameProvider = frameProvider;
        }

        private void AcceptResult(ConnectedMachineVMResult result)
        {
            Result = result;
            Accept();
        }

        public override void OnShow()
        {
            base.OnShow();
            LoadMachineCounters();
        }

        private async void LoadMachineCounters()
        {
            try
            {
                TotalMachineMeters = "loading...";
                TotalMachineWorkTime = "loading...";

                using (ObservablesContext db = ObservablesContext.CreateDefault())
                {
                    var jobRuns = await db.JobRuns.Where(x => x.MachineGuid == ApplicationManager.Machine.Guid).Select(x => new { x.StartDate, x.EndDate, x.EndPosition }).ToListAsync();

                    TotalMachineWorkTime = TimeSpan.FromHours(jobRuns.Select(x => x.EndDate - x.StartDate).Sum(x => x.TotalHours)).ToStringUnlimitedHours();

                    int meters = (int)jobRuns.Select(x => x.EndPosition).Sum();
                    TotalMachineMeters = $"{meters.ToString("N0")} meters";
                }
            }
            catch (Exception ex)
            {
                LogManager.Log(ex, "Error loading machine counters.");
                TotalMachineMeters = "error!";
                TotalMachineWorkTime = "error!";
            }
        }
    }
}