using Microsoft.Win32;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Data;
using Tango.BL;
using Tango.BL.Builders;
using Tango.BL.Calibration;
using Tango.BL.Entities;
using Tango.Core.Commands;
using Tango.MachineStudio.ColorLab.ViewModels;
using Tango.MachineStudio.Common;
using Tango.MachineStudio.Common.Notifications;
using Tango.MachineStudio.RML.Contracts;
using Tango.MachineStudio.RML.Views;
using Tango.PMR.ColorLab;

namespace Tango.MachineStudio.RML.ViewModels
{
    public class MainViewVM : StudioViewModel<IMainView>
    {
        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 ObservableCollection<MediaMaterial> _materials;
        public ObservableCollection<MediaMaterial> Materials
        {
            get { return _materials; }
            set { _materials = value; RaisePropertyChangedAuto(); }
        }

        private ObservableCollection<MediaPurpos> _purposes;
        public ObservableCollection<MediaPurpos> Purposes
        {
            get { return _purposes; }
            set { _purposes = value; RaisePropertyChangedAuto(); }
        }

        private ObservableCollection<MediaCondition> _conditions;
        public ObservableCollection<MediaCondition> Conditions
        {
            get { return _conditions; }
            set { _conditions = value; RaisePropertyChangedAuto(); }
        }

        private ObservableCollection<LinearMassDensityUnit> _linearMassDensityUnits;
        public ObservableCollection<LinearMassDensityUnit> LinearMassDensityUnits
        {
            get { return _linearMassDensityUnits; }
            set { _linearMassDensityUnits = value; RaisePropertyChangedAuto(); }
        }

        private ObservableCollection<FiberShape> _fiberShapes;
        public ObservableCollection<FiberShape> FiberShapes
        {
            get { return _fiberShapes; }
            set { _fiberShapes = value; RaisePropertyChangedAuto(); }
        }

        private ObservableCollection<FiberSynth> _fiberSynths;
        public ObservableCollection<FiberSynth> FiberSynths
        {
            get { return _fiberSynths; }
            set { _fiberSynths = value; RaisePropertyChangedAuto(); }
        }

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

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

        private CalibrationDataViewVM _calibrationDataViewVM;
        public CalibrationDataViewVM CalibrationDataViewVM
        {
            get { return _calibrationDataViewVM; }
            set { _calibrationDataViewVM = value; RaisePropertyChangedAuto(); }
        }

        private ObservableCollection<LiquidTypesRml> _liquidTypesRmls;
        public ObservableCollection<LiquidTypesRml> LiquidTypesRmls
        {
            get { return _liquidTypesRmls; }
            set { _liquidTypesRmls = value; RaisePropertyChangedAuto(); }
        }

        private ProcessParametersTablesGroup _activeProcessParametersGroup;
        public ProcessParametersTablesGroup ActiveProcessParametersGroup
        {
            get { return _activeProcessParametersGroup; }
            set { _activeProcessParametersGroup = value; RaisePropertyChangedAuto(); }
        }

        private ICollectionView _activeProcessParametersTableView;
        public ICollectionView ActiveProcessParametersTableView
        {
            get { return _activeProcessParametersTableView; }
            set { _activeProcessParametersTableView = value; RaisePropertyChangedAuto(); }
        }


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

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

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

        public RelayCommand AddProcessParametersTableCommand { get; set; }

        public RelayCommand<ProcessParametersTable> RemoveProcessParametersTableCommand { get; set; }

        public RelayCommand AddLiquidFactorCommand { get; set; }

        public RelayCommand<LiquidTypesRml> RemoveLiquidFactorCommand { get; set; }

        public RelayCommand CreateCalibrationDataExcelTemplateCommand { get; set; }

        /// <summary>
        /// Gets or sets the back to RMLS command.
        /// </summary>
        public RelayCommand BackToRmlsCommand { get; set; }

        public RelayCommand SaveCommand { get; set; }

        public MainViewVM(INotificationProvider notificationProvider)
        {
            _notification = notificationProvider;
            ManageRmlCommand = new RelayCommand(() => LoadActiveRML(SelectedRML.Guid), () => SelectedRML != null);
            RemoveRmlCommand = new RelayCommand(RemoveSelectedRml);
            AddRmlCommand = new RelayCommand(AddNewRml);
            BackToRmlsCommand = new RelayCommand(BackToRmls, () => IsFree);
            AddProcessParametersTableCommand = new RelayCommand(AddProcessParametersTable, () => IsFree);
            RemoveProcessParametersTableCommand = new RelayCommand<ProcessParametersTable>(RemoveProcessParametersTable, () => IsFree);
            AddLiquidFactorCommand = new RelayCommand(AddLiquidFactor, () => IsFree);
            RemoveLiquidFactorCommand = new RelayCommand<LiquidTypesRml>(RemoveLiquidFactor, () => IsFree);
            CreateCalibrationDataExcelTemplateCommand = new RelayCommand(CreateCalibrationDataExcelTemplate);
            SaveCommand = new RelayCommand(Save, () => IsFree);
        }

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

        private async void LoadRmls()
        {
            if (_rmls_context != null) _rmls_context.Dispose();

            _rmls_context = ObservablesContext.CreateDefault();
            Rmls = await new RmlsCollectionBuilder(_rmls_context).Set().WithLiquidFactors().WithMediaProperties().BuildAsync();
        }

        private async void LoadActiveRML(String guid)
        {
            using (_notification.PushTaskItem("Loading RML..."))
            {
                IsFree = false;

                if (_active_context != null)
                {
                    _active_context.Dispose();
                }

                _active_context = ObservablesContext.CreateDefault();

                LoadRmlProperties();

                ActiveRML = await new RmlBuilder(_active_context)
                    .Set(guid)
                    .WithActiveParametersGroup()
                    .WithLiquidFactors()
                    .BuildAsync();

                if (ActiveRML.ProcessParametersTablesGroups.ToList().Count == 0)
                {
                    if (!_notification.ShowQuestion("Could not find any process group for the selected RML. Would you like to create one?"))
                    {
                        _notification.ShowError("Cannot load an RML with no process group.");
                        IsFree = true;
                        return;
                    }
                    else
                    {
                        ProcessParametersTablesGroup group = new ProcessParametersTablesGroup();
                        group.Name = "Active Group";
                        group.Active = true;
                        group.ProcessParametersTables.Add(new ProcessParametersTable()
                        {
                            Name = "Process Table 1",
                        });

                        group.Rml = ActiveRML;

                        _active_context.ProcessParametersTablesGroups.Add(group);
                        _active_context.ProcessParametersTables.Add(group.ProcessParametersTables[0]);
                        await _active_context.SaveChangesAsync();
                        LoadActiveRML(ActiveRML.Guid);
                        return;
                    }
                }

                ActiveProcessParametersGroup = ActiveRML.ProcessParametersTablesGroups.ToList().FirstOrDefault();
                ActiveProcessParametersTableView = CollectionViewSource.GetDefaultView(ActiveProcessParametersGroup.ProcessParametersTables);
                ActiveProcessParametersTableView.SortDescriptions.Add(new SortDescription(nameof(ProcessParametersTable.TableIndex), ListSortDirection.Ascending));

                CalibrationDataViewVM = new CalibrationDataViewVM(_notification);
                LiquidTypesRmls = ActiveRML.LiquidTypesRmls;

                foreach (var liquidTypeRml in LiquidTypesRmls)
                {
                    CalibrationDataVM catVM = new CalibrationDataVM(liquidTypeRml.LiquidType);

                    if (liquidTypeRml.DefaultCatData != null)
                    {
                        catVM.CalibrationPoints = liquidTypeRml.GetCalibrationData().CalibrationPoints.Select(x => new CalibrationDataPointVM(x.X, x.Y)).ToObservableCollection();
                    }

                    CalibrationDataViewVM.LiquidsCalibrationData.Add(catVM);
                }


                View.NavigateTo(RmlNavigationView.RmlView);

                IsFree = true;
            }
        }

        private void LoadRmlProperties()
        {
            Materials = _active_context.MediaMaterials.ToObservableCollection();
            Purposes = _active_context.MediaPurposes.ToObservableCollection();
            Conditions = _active_context.MediaConditions.ToObservableCollection();
            LinearMassDensityUnits = _active_context.LinearMassDensityUnits.ToObservableCollection();
            FiberShapes = _active_context.FiberShapes.ToObservableCollection();
            FiberSynths = _active_context.FiberSynths.ToObservableCollection();
        }

        private async void AddNewRml()
        {
            var name = _notification.ShowTextInput("Please enter RML name", "Name");

            if (!String.IsNullOrWhiteSpace(name))
            {
                if (Rmls.ToList().Exists(x => x.Name == name))
                {
                    _notification.ShowError("The specified RML name already exists. Please select a different name.");
                    return;
                }

                using (_notification.PushTaskItem("Creating new RML..."))
                {
                    IsFree = false;

                    if (_active_context != null)
                    {
                        _active_context.Dispose();
                    }

                    _active_context = ObservablesContext.CreateDefault();

                    LoadRmlProperties();

                    Rml rml = new Rml();
                    rml.Name = name;
                    rml.Manufacturer = "Twine";
                    rml.Code = Rmls.Max(x => x.Code) + 1;
                    rml.MediaMaterial = Materials.FirstOrDefault();
                    rml.MediaPurpose = Purposes.FirstOrDefault();
                    rml.MediaCondition = Conditions.FirstOrDefault();
                    rml.LinearMassDensityUnit = LinearMassDensityUnits.FirstOrDefault();
                    rml.FiberShape = FiberShapes.FirstOrDefault();
                    rml.FiberSynth = FiberSynths.FirstOrDefault();

                    ProcessParametersTablesGroup group = new ProcessParametersTablesGroup();
                    group.Name = "Active Group";
                    group.Active = true;
                    group.ProcessParametersTables.Add(new ProcessParametersTable()
                    {
                        Name = "Process Table 1",
                    });

                    group.Rml = rml;

                    _active_context.ProcessParametersTablesGroups.Add(group);
                    _active_context.ProcessParametersTables.Add(group.ProcessParametersTables[0]);
                    _active_context.Rmls.Add(rml);
                    await _active_context.SaveChangesAsync();
                    LoadActiveRML(rml.Guid);

                    IsFree = true;
                }
            }
        }

        private async void RemoveSelectedRml()
        {
            if (_notification.ShowQuestion("Removing the selected RML will result in the loss of all related process parameters and default calibration data. Are you sure you want to delete the selected RML?"))
            {
                IsFree = false;

                using (_notification.PushTaskItem("Removing RML..."))
                {
                    try
                    {
                        await SelectedRML.DeleteCascadeAsync(_rmls_context);
                        LoadRmls();
                    }
                    catch (Exception ex)
                    {
                        LogManager.Log(ex, $"Error removing selected RML {SelectedRML.Name}.");
                        _notification.ShowError($"An error occurred while trying to remove the selected RML.\n{ex.Message}");
                    }
                }

                IsFree = true;
            }
        }

        private void AddProcessParametersTable()
        {
            var name = _notification.ShowTextInput("Enter table name", "Name");

            if (!String.IsNullOrWhiteSpace(name))
            {
                _active_context.ProcessParametersTables.Add(new ProcessParametersTable()
                {
                    ProcessParametersTablesGroup = ActiveProcessParametersGroup,
                    Name = name,
                    TableIndex = ActiveProcessParametersGroup.ProcessParametersTables.Max(x => x.TableIndex) + 1,
                });
            }
        }

        public void OnProcessParametersTableDropped(ProcessParametersTable dragged, ProcessParametersTable dropped)
        {
            if (dragged.TableIndex > dropped.TableIndex)
            {
                dragged.TableIndex = dropped.TableIndex - 1;
            }
            else
            {
                dragged.TableIndex = dropped.TableIndex + 1;
            }

            int index = 0;

            foreach (var table in ActiveProcessParametersGroup.ProcessParametersTables.OrderBy(x => x.TableIndex))
            {
                table.TableIndex = index++;
            }

            ActiveProcessParametersTableView.Refresh();
        }

        private void RemoveLiquidFactor(LiquidTypesRml liquidFactor)
        {
            if (_notification.ShowQuestion("Removing this liquid factor will remove the liquid type association with the RML and will drop the calibration data. Are you sure?"))
            {
                var catVM = CalibrationDataViewVM.LiquidsCalibrationData.SingleOrDefault(x => x.LiquidType == liquidFactor.LiquidType);
                CalibrationDataViewVM.LiquidsCalibrationData.Remove(catVM);
                _active_context.LiquidTypesRmls.Remove(liquidFactor);
            }
        }

        private void AddLiquidFactor()
        {
            AddLiquidFactorViewVM vm = new AddLiquidFactorViewVM(_active_context);
            _notification.ShowModalDialog<AddLiquidFactorViewVM, AddLiquidFactorView>(vm, (_) =>
            {
                if (LiquidTypesRmls.ToList().Exists(x => x.LiquidType == vm.SelectedLiquidType))
                {
                    _notification.ShowError("The selected liquid type is already associated with this RML.");
                    return;
                }

                LiquidTypesRml liquidFactor = new LiquidTypesRml()
                {
                    LiquidType = vm.SelectedLiquidType,
                    Rml = ActiveRML,
                };

                _active_context.LiquidTypesRmls.Add(liquidFactor);

                CalibrationDataVM catVM = new CalibrationDataVM(liquidFactor.LiquidType);

                CalibrationDataViewVM.LiquidsCalibrationData.Add(catVM);

            }, () => { });
        }

        private void RemoveProcessParametersTable(ProcessParametersTable processParametersTable)
        {
            if (ActiveProcessParametersGroup.ProcessParametersTables.Count == 1)
            {
                _notification.ShowError("The process group must contain at least one table.");
                return;
            }

            if (_notification.ShowQuestion("Are you sure you want to remove this process parameters table?"))
            {
                _active_context.ProcessParametersTables.Remove(processParametersTable);
            }
        }

        private void CreateCalibrationDataExcelTemplate()
        {
            SaveFileDialog dlg = new SaveFileDialog();
            try
            {
                dlg.Title = $"Create excel template file";
                dlg.Filter = "Excel Files|*.xlsx";
                dlg.DefaultExt = ".xlsx";
                dlg.FileName = "Calibration File Template";
                if (dlg.ShowDialog().Value)
                {
                    CalibrationHelper.CreateCalibrationDataExcelTemplate(dlg.FileName);
                }
            }
            catch (Exception ex)
            {
                LogManager.Log(ex, "Error generating excel calibration template file " + dlg.FileName);
                _notification.ShowError("An error occurred while trying to generate the calibration file.");
            }
        }

        private async void Save()
        {
            IsFree = false;

            try
            {
                using (_notification.PushTaskItem("Saving RML..."))
                {
                    foreach (var calDataVM in CalibrationDataViewVM.LiquidsCalibrationData)
                    {
                        var liquidTypeRml = LiquidTypesRmls.SingleOrDefault(x => x.LiquidType == calDataVM.LiquidType);
                        CalibrationData calData = new CalibrationData();
                        calData.LiquidType = (PMR.ColorLab.LiquidType)liquidTypeRml.LiquidType.Code;
                        calData.CalibrationPoints.AddRange(calDataVM.CalibrationPoints.Select(x => new CalibrationPoint() { X = x.X, Y = x.Y }));
                        liquidTypeRml.PutCalibrationData(calData);
                    }

                    ActiveRML.LastUpdated = DateTime.UtcNow;

                    await _active_context.SaveChangesAsync();
                }
            }
            catch (Exception ex)
            {
                LogManager.Log(ex, $"Error saving RML {ActiveRML.Name}");
                _notification.ShowError($"An error occurred while trying to save the current RML.\n{ex.Message}");
            }

            LoadActiveRML(ActiveRML.Guid);

            IsFree = true;
        }

        private void BackToRmls()
        {
            View.NavigateTo(RmlNavigationView.RmlsView);
            LoadRmls();
        }
    }
}