using DaSaSo.Domain.Enums;
using DaSaSo.Domain.Model;
using DaSaSo.Domain.Services;
using DaSaSo.EntityFramework;
using DaSaSo.EntityFramework.Services;
using DaSaSo.ViewModel.Commands;
using DaSaSo.ViewModel.Enums;
using DaSaSo.ViewModel.Interface;
using DaSaSo.ViewModel.State.Navigation;
using Microsoft.Toolkit.Mvvm.Input;
using Microsoft.Win32;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;

namespace DaSaSo.ViewModel
{
    public sealed class MainWindowViewModel : BaseViewModel
    {
        private readonly IViewModelAbstractFactory viewModelFactory;

        public MainWindowViewModel(IViewModelAbstractFactory viewModelFactory)
        {
            this.viewModelFactory = viewModelFactory;
        }

        private readonly IActualProject _actualProject;
        private readonly IDataService<Client> _clientDataService;
        private readonly IDataService<Project> _projectDataService;
        private readonly IDataService<Buildingsite> _buildingsiteDataService;

        private string _clientname = "";
        private string _projektname = "";
        private string _buildingsitename = "";
        private readonly RegistryKey? registry;
        const string REGISTRYKEY = "HKEY_CURRENT_USER\\Software\\Cosysda\\DaSaSo";
        public bool CanSelectProject { get => _actualProject.AktuellClient != null; }
        public bool CanSelectBuildingSite { get => _actualProject.AktuellProjekt != null; }
        public bool CanSelectSewerObjects { get => _actualProject.AktuellBaustelle != null; }

        public IMainWindowNavigator Navigator { get; set; }
        public ICommand UpdateCurrentViewModelCommand { get;  }
        public BaseViewModel CurrentViewModel => Navigator.CurrentViewModel;
        
        public string ClientName
        {
            get => _clientname;
            set
            {
                if(_clientname != value)
                {
                    _clientname = value;
                    OnPropertyChanged();
                }
            }
        }

        public string Projektname
        {
            get => _projektname;
            set
            {
                if (_projektname != value)
                {
                    _projektname = value;
                    OnPropertyChanged();
                }
            }
        }
        public string Buildingsitename
        {
            get => _buildingsitename;
            set
            {
                if (_buildingsitename != value)
                {
                    _buildingsitename = value;
                    OnPropertyChanged();
                }
            }
        }
        public static string ApplicationTitle
        {
            get
            {
                string gitVersion;
#pragma warning disable CS8600 // Converting null literal or possible null value to non-nullable type.
                using (Stream stream = Assembly.GetExecutingAssembly().GetManifestResourceStream("DaSaSo.ViewModel.version.txt"))
#pragma warning restore CS8600 // Converting null literal or possible null value to non-nullable type.
#pragma warning disable CS8604 // Possible null reference argument.
                using (StreamReader reader = new(stream))
#pragma warning restore CS8604 // Possible null reference argument.
                {
                    gitVersion = reader.ReadToEnd();
                }
                return string.Format("Cosysda Sanierung Software : {0}",gitVersion);
            }
        }

        public MainWindowViewModel(IMainWindowNavigator navigator,IViewModelAbstractFactory viewModelFactory,
            IActualProject actualProject,
            IDataService<Client> clientDataService,
            IDataService<Project> projectDataService,
            IDataService<Buildingsite> buildingsiteDataService
            )
        {
            this.Navigator = navigator;
            this.viewModelFactory = viewModelFactory;
            _clientDataService = clientDataService;
            _projectDataService = projectDataService;
            _buildingsiteDataService = buildingsiteDataService;
            
            registry = Registry.CurrentUser.OpenSubKey("Software\\Cosysda\\DaSaSo");
            if (registry == null) InitRegistry();

            Navigator.StateChanged += Navigator_StateChanged;

            UpdateCurrentViewModelCommand = new UpdateCurrentViewModelCommand(navigator, viewModelFactory);
            UpdateCurrentViewModelCommand.Execute(EMainWindowViewType.Home);
            _actualProject = actualProject;
            _actualProject.ClientChanged += ActualProject_ClientChanged;
            _actualProject.ProjectChanged += ActualProject_ProjectChanged;
            _actualProject.BuildingSiteChanged += ActualProject_BuildingSiteChanged;
            _actualProject.SewerObjectChanged += ActualProject_SewerObjectChanged;

            LadeRegistry();
        }

        private async void LadeRegistry()
        {
            int clientid = Convert.ToInt32((string)registry.GetValue("lastclient", "-1"));
            if (clientid == -1)
                return;
            Client lastClient = await _clientDataService.Get(clientid);
            if (lastClient == null)
            {
                SaveInRegistry("lastclient", "-1");
                return;
            }
            _actualProject.SetClient(lastClient);

            int projectid = Convert.ToInt32((string)registry.GetValue("lastproject", "-1"));
            if (projectid == -1)
                return;
            Project lastProject = await _projectDataService.Get(projectid);
            if(lastProject == null)
            {
                SaveInRegistry("lastproject","-1");
                return;
            }
            _actualProject.SetProject(lastProject);

            string? value = registry.GetValue("lastbuildingsite", "-1") as string;
            int buildingsiteid = Convert.ToInt32(value);
            if (buildingsiteid == -1)
                return;
            Buildingsite lastBuildingiste = await _buildingsiteDataService.Get(buildingsiteid);
            if(lastBuildingiste == null)
            {
                SaveInRegistry("lastbuildingsite","-1");
                return;
            }
            _actualProject.SetBuildingSite(lastBuildingiste);

        }

        private static void SaveInRegistry(string key, string value)
        {
            Registry.SetValue(REGISTRYKEY, key, value);
        }

        private void InitRegistry()
        {
            Registry.CurrentUser.CreateSubKey("Software\\Cosysda\\DaSaSo");
            LadeRegistry();
        }

        private void ActualProject_SewerObjectChanged(object? sender, EventArgs e)
        {
            UpdateCurrentViewModelCommand.Execute(EMainWindowViewType.SewerMainMenu);
        }

        private void Navigator_StateChanged()
        {
            OnPropertyChanged(nameof(CurrentViewModel));
        }

        private void ActualProject_BuildingSiteChanged(object? sender, EventArgs e)
        {
            SaveInRegistry("lastbuildingsite", _actualProject.AktuellBaustelle.Id.ToString());
            Buildingsitename = _actualProject.AktuellBaustelle.BuildingSiteNumber;
            OnPropertyChanged(nameof(CanSelectSewerObjects));
            UpdateCurrentViewModelCommand.Execute(EMainWindowViewType.SewerObjects);
        }

        private void ActualProject_ProjectChanged(object? sender, EventArgs e)
        {
            SaveInRegistry("lastproject", _actualProject.AktuellProjekt.Id.ToString());
            Projektname = _actualProject.AktuellProjekt.Name;
            OnPropertyChanged(nameof(CanSelectBuildingSite));
            UpdateCurrentViewModelCommand.Execute(EMainWindowViewType.Buildingsites);
        }

        private void ActualProject_ClientChanged(object? sender, EventArgs e)
        {
            SaveInRegistry("lastclient", _actualProject.AktuellClient.Id.ToString());
            ClientName = _actualProject.AktuellClient.Firstname;
            OnPropertyChanged(nameof(CanSelectProject));
            UpdateCurrentViewModelCommand.Execute(EMainWindowViewType.Projects);
        }
    }
}