using GalaSoft.MvvmLight.Ioc;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.Core.Commands;
using Tango.DAL.Observables;
using Tango.MachineStudio.Common.Controls;
using Tango.MachineStudio.Common.Notifications;
using Tango.MachineStudio.Common.StudioApplication;
using Tango.SharedUI;

namespace Tango.MachineStudio.Developer.ViewModels
{
    /// <summary>
    /// Represents the developer module main view, view model.
    /// </summary>
    /// <seealso cref="Tango.SharedUI.ViewModel" />
    public class MainViewVM : ViewModel
    {
        private INotificationProvider _notification;

        #region Properties

        /// <summary>
        /// Gets or sets the application manager.
        /// </summary>
        public IStudioApplicationManager ApplicationManager { get; set; }

        /// <summary>
        /// Gets or sets observable entites database the adapter.
        /// </summary>
        public ObservablesEntitiesAdapter Adapter { get; set; }

        private Machine _selectedMachine;
        /// <summary>
        /// Gets or sets the selected machine.
        /// </summary>
        public Machine SelectedMachine
        {
            get { return _selectedMachine; }
            set { _selectedMachine = value; RaisePropertyChangedAuto(); OnMachineChanged(); InvalidateRelayCommands(); }
        }

        private List<LiquidTypesRml> _liquidTypesRmls;
        /// <summary>
        /// Gets or sets the liquid types RMLS.
        /// </summary>
        public List<LiquidTypesRml> LiquidTypesRmls
        {
            get { return _liquidTypesRmls; }
            set { _liquidTypesRmls = value; RaisePropertyChangedAuto(); }
        }

        private ProcessParametersTablesGroup _rmlProcessParametersTablesGroup;
        /// <summary>
        /// Gets or sets the RML process parameters table group (cloned).
        /// </summary>
        public ProcessParametersTablesGroup RmlProcessParametersTableGroup
        {
            get { return _rmlProcessParametersTablesGroup; }
            set { _rmlProcessParametersTablesGroup = value; RaisePropertyChangedAuto(); }
        }

        private ObservableCollection<ProcessParametersTablesGroup> _groupsHistory;
        /// <summary>
        /// Gets or sets the RML process parameters groups history.
        /// </summary>
        public ObservableCollection<ProcessParametersTablesGroup> GroupsHistory
        {
            get { return _groupsHistory; }
            set { _groupsHistory = value; RaisePropertyChangedAuto(); }
        }

        private ProcessParametersTablesGroup _selectedGroupHistory;
        /// <summary>
        /// Gets or sets the selected process parameters tables group history.
        /// </summary>
        public ProcessParametersTablesGroup SelectedGroupHistory
        {
            get { return _selectedGroupHistory; }
            set { _selectedGroupHistory = value; RaisePropertyChangedAuto(); OnSelectedGroupHistoryChanged(); }
        }

        private Job _selectedJob;
        /// <summary>
        /// Gets or sets the selected machine job.
        /// </summary>
        public Job SelectedJob
        {
            get { return _selectedJob; }
            set { _selectedJob = value; RaisePropertyChangedAuto(); }
        }

        private Rml _selectedRML;
        /// <summary>
        /// Gets or sets the selected RML.
        /// </summary>
        public Rml SelectedRML
        {
            get { return _selectedRML; }
            set { _selectedRML = value; RaisePropertyChangedAuto(); InvalidateLiquidFactorsAndProcessTables(); InvalidateRelayCommands(); }
        }

        private bool _isSideBarOpened;
        /// <summary>
        /// Gets or sets a value indicating whether the configuration panels are opened.
        /// </summary>
        public bool IsSideBarOpened
        {
            get { return _isSideBarOpened; }
            set { _isSideBarOpened = value; RaisePropertyChangedAuto(); }
        }

        private ObservableCollection<Sensor> _availableSensors;
        /// <summary>
        /// Gets or sets the available sensors.
        /// </summary>
        public ObservableCollection<Sensor> AvailableSensors
        {
            get { return _availableSensors; }
            set { _availableSensors = value; RaisePropertyChangedAuto(); }
        }

        private ObservableCollection<RealTimeGraphControl> _graphs;
        /// <summary>
        /// Gets or sets the collection of displayed graph controls.
        /// </summary>
        public ObservableCollection<RealTimeGraphControl> Graphs
        {
            get { return _graphs; }
            set { _graphs = value; RaisePropertyChangedAuto(); }
        }

        #endregion

        #region Commands

        /// <summary>
        /// Gets or sets the edit machine command.
        /// </summary>
        public RelayCommand EditMachineCommand { get; set; }

        /// <summary>
        /// Gets or sets the edit RML command.
        /// </summary>
        public RelayCommand EditRMLCommand { get; set; }

        /// <summary>
        /// Gets or sets the toggle side bar command.
        /// </summary>
        public RelayCommand ToggleSideBarCommand { get; set; }

        /// <summary>
        /// Gets or sets the save process parameters command.
        /// </summary>
        public RelayCommand SaveProcessParametersCommand { get; set; }

        /// <summary>
        /// Gets or sets the save liquid factors command.
        /// </summary>
        public RelayCommand SaveLiquidFactorsCommand { get; set; }

        #endregion

        #region Constructors

        /// <summary>
        /// Initializes a new instance of the <see cref="MainViewVM"/> class.
        /// </summary>
        public MainViewVM()
        {
            IsSideBarOpened = true;

            if (!this.DesignMode)
            {
                Adapter = ObservablesEntitiesAdapter.Instance;
                AvailableSensors = Adapter.Sensors.ToObservableCollection();
            }

            Graphs = new ObservableCollection<RealTimeGraphControl>();
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="MainViewVM"/> class.
        /// </summary>
        /// <param name="applicationManager">The application manager.</param>
        /// <param name="notificationProvider">The notification provider.</param>
        [PreferredConstructor]
        public MainViewVM(IStudioApplicationManager applicationManager, INotificationProvider notificationProvider) : this()
        {
            _notification = notificationProvider;
            EditMachineCommand = new RelayCommand(EditMachine, (x) => SelectedMachine != null);
            ApplicationManager = applicationManager;
            EditRMLCommand = new RelayCommand(EditRML, (x) => SelectedRML != null);
            ToggleSideBarCommand = new RelayCommand(() => IsSideBarOpened = !IsSideBarOpened);
            SaveProcessParametersCommand = new RelayCommand(SaveProcessParameters);
            SaveLiquidFactorsCommand = new RelayCommand(SaveLiquidFactors);
        }

        #endregion

        #region Virtual Methods

        /// <summary>
        /// Called when the selected group history has been changed
        /// </summary>
        protected virtual void OnSelectedGroupHistoryChanged()
        {
            if (SelectedGroupHistory != null)
            {
                RmlProcessParametersTableGroup = SelectedGroupHistory.CloneGroup();
            }
        }

        /// <summary>
        /// Called when the machine has been changed
        /// </summary>
        protected virtual void OnMachineChanged()
        {
            InvalidateLiquidFactorsAndProcessTables();
        }

        #endregion

        #region Private Methods

        /// <summary>
        /// Saves the liquid factors.
        /// </summary>
        private async void SaveLiquidFactors()
        {
            if (SelectedRML != null)
            {
                using (_notification.PushTaskItem("Saving Liquid Factors..."))
                {
                    String machineGuid = SelectedMachine.Guid;
                    String rmlGuid = SelectedRML.Guid;

                    await SelectedRML.SaveAsync();

                    SelectedMachine = Adapter.Machines.SingleOrDefault(x => x.Guid == machineGuid);
                    SelectedRML = Adapter.Rmls.SingleOrDefault(x => x.Guid == rmlGuid);
                }
            }
        }

        /// <summary>
        /// Navigates to the DB Module in order to edit the selected RML.
        /// </summary>
        private void EditRML()
        {
            ApplicationManager.RequestModule("Data Base", SelectedRML);
        }

        /// <summary>
        /// Navigates to the Machine Designer Module in order to edit the selected machine.
        /// </summary>
        private void EditMachine()
        {
            ApplicationManager.RequestModule("Machine Designer", SelectedMachine);
        }

        /// <summary>
        /// Saves the process parameters group.
        /// </summary>
        private async void SaveProcessParameters()
        {
            var response = _notification.ShowTextInput("Enter Group Name", "Group Name");

            if (response == null) return;

            using (_notification.PushTaskItem("Saving Parameters Group..."))
            {
                ProcessParametersTablesGroup group = new ProcessParametersTablesGroup();

                List<ProcessParametersTable> tables = new List<ProcessParametersTable>();
                foreach (var table in RmlProcessParametersTableGroup.ProcessParametersTables)
                {
                    var newTable = table.CloneEntity();
                    newTable.ProcessParametersTablesGroups = group;
                    tables.Add(newTable);
                }

                group.Active = true;
                group.ProcessParametersTables = tables.ToObservableCollection();
                group.Rml = SelectedRML;
                group.Name = response;
                group.SaveDate = DateTime.UtcNow;

                foreach (var g in SelectedRML.ProcessParametersTablesGroups)
                {
                    g.Active = false;
                }

                String machineGuid = SelectedMachine.Guid;
                String rmlGuid = SelectedRML.Guid;

                SelectedRML.ProcessParametersTablesGroups.Add(group);
                await SelectedRML.SaveAsync();

                SelectedMachine = Adapter.Machines.SingleOrDefault(x => x.Guid == machineGuid);
                SelectedRML = Adapter.Rmls.SingleOrDefault(x => x.Guid == rmlGuid);
            }
        }

        /// <summary>
        /// Invalidates the liquid factors and process parameters tables.
        /// </summary>
        private void InvalidateLiquidFactorsAndProcessTables()
        {
            if (SelectedRML != null && SelectedMachine != null)
            {
                LiquidTypesRmls = SelectedMachine.Configuration.IdsPacks.OrderBy(x => x.PackIndex).Select(x => x.LiquidTypes).SelectMany(x => x.LiquidTypesRmls).Where(x => x.Rml.Guid == SelectedRML.Guid).ToList();
                RmlProcessParametersTableGroup = SelectedRML.ProcessParametersTablesGroups.SingleOrDefault(x => x.Active);

                if (RmlProcessParametersTableGroup != null)
                {
                    RmlProcessParametersTableGroup = RmlProcessParametersTableGroup.CloneGroup();
                    RmlProcessParametersTableGroup.ProcessParametersTables = RmlProcessParametersTableGroup.ProcessParametersTables.OrderBy(x => x.TableIndex).ToObservableCollection();
                }

                GroupsHistory = SelectedRML.ProcessParametersTablesGroups.OrderByDescending(x => x.SaveDate).OrderBy(x => !x.Active).ToObservableCollection();
            }
        }

        #endregion

        #region Public Events

        /// <summary>
        /// Add sensor graph from available sensors to displayed graphs.
        /// </summary>
        /// <param name="sensor">The sensor.</param>
        public void OnDropAvailableSensor(Sensor sensor)
        {
            if (Graphs.Count < 8)
            {
                RealTimeGraphControl graphControl = new RealTimeGraphControl();
                graphControl.Tag = sensor;
                graphControl.SensorName = sensor.Description;
                graphControl.SensorUnits = sensor.Units;
                graphControl.Graph.Minimum = sensor.Min;
                graphControl.Graph.Maximum = sensor.Max;
                graphControl.Graph.MaxPoints = Common.Helpers.GraphsHelper.GetMaxPoints(sensor.PointsPerFrame);
                graphControl.GraphRemoveButtonPressed += (sender, __) =>
                {
                    RemoveGraph(sender as RealTimeGraphControl);
                };
                Graphs.Add(graphControl);
                AvailableSensors.Remove(sensor);
            }
            else
            {
                _notification.ShowInfo("The maximum number of real-time graphs is eight. Please remove a graph to add another.");
            }
        }

        /// <summary>
        /// Removes the graph.
        /// </summary>
        /// <param name="graph">The graph.</param>
        public void RemoveGraph(RealTimeGraphControl graph)
        {
            Graphs.Remove(graph);
            AvailableSensors.Insert(0, graph.Tag as Sensor);
        }

        #endregion
    }
}