using KanSan.Base;
using KanSan.Base.Interfaces;
using KanSan.Base.Models;
using Microsoft.Win32;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;

namespace KanSan.ViewModel
{
    public class MainWindowViewModel : PropertyChangedClass, INotifyPropertyChanged
    {
        IUnitOfWork unitOfWork = new UnitOfWork(new KanSanContext());
        RegistryKey registry;
        const string REGISTRYKEY = "HKEY_CURRENT_USER\\Software\\Cosysda\\KanSan";

        private Kunde _selectedKunde;
        private Projekt _selectedProjekt;
        private Baustelle _selectedBaustelle;
        

        public string ApplicationTitle
        {
            get
            {
                string gitVersion;

                using (Stream stream = Assembly.GetExecutingAssembly().GetManifestResourceStream("KanSan.ViewModel.version.txt"))
                using (StreamReader reader = new StreamReader(stream))
                {
                    gitVersion = reader.ReadToEnd();
                }

                return string.Format("KanalSanierungsverwaltung : {0}",gitVersion);
            }
        }

        public Kunde SelectedKunde
        {
            get
            {
                return _selectedKunde;
            }
            set
            {
                if (_selectedKunde != null)
                {
                    if (_selectedKunde.GuidNr.Equals(value.GuidNr)) return;
                }
                _selectedKunde = value;
                _selectedProjekt = null;
                _selectedBaustelle = null;
                SaveInRegistry("LastKunde", value.GuidNr.ToString());
                OnPropertyChanged();
            }
        }
        public Projekt SelectedProjekt
        {
            get
            {
                return _selectedProjekt;
            }
            set
            {
                if(_selectedProjekt != null)
                {
                    if (_selectedProjekt.GuidNr.Equals(value.GuidNr)) return;
                }
                _selectedProjekt = value;
                SaveInRegistry("LastProjekt", value.GuidNr.ToString());
                OnPropertyChanged();
            }
        }
        public Baustelle SelectedBaustelle
        {
            get
            {
                return _selectedBaustelle;
            }
            set
            {
                if(_selectedBaustelle != null)
                {
                    if (_selectedBaustelle.GuidNr.Equals(value.GuidNr)) return;
                }
                _selectedBaustelle = value;
                SaveInRegistry("LastBaustelle", value.GuidNr.ToString());
                OnPropertyChanged();
            }
        }
        private void SaveInRegistry(string key, string value)
        {
            Registry.SetValue(REGISTRYKEY, key, value);
            
        }
        private void LadeRegistry()
        {
            registry = Registry.CurrentUser.OpenSubKey("Software\\Cosysda\\KanSan");
            if (registry == null) InitRegistry();

            string clientGuidStr = (string)registry.GetValue("LastKunde");
            if (clientGuidStr != null)
            {
                Guid clientGuid = Guid.Parse(clientGuidStr);

                if (clientGuid != null)
                {
                    IEnumerable<Kunde> loadedKunden = unitOfWork.KundenRepository.Get(x => x.GuidNr.Equals(clientGuid));
                    if (loadedKunden.Count() == 1) _selectedKunde = loadedKunden.First();
                }
            }

            string projekteGuidStr = (string)registry.GetValue("LastProjekt");
            if (projekteGuidStr != null)
            {
                Guid projekteGuid = Guid.Parse(projekteGuidStr);

                if (projekteGuid != null)
                {
                    IEnumerable<Projekt> loadedProjekte = unitOfWork.ProjekteRepository.Get(x => x.GuidNr.Equals(projekteGuid));
                    if (loadedProjekte.Count() == 1) _selectedProjekt = loadedProjekte.First();
                }
            }

            string baustellenGuidStr = (string)registry.GetValue("LastBaustelle");
            if (baustellenGuidStr != null)
            {
                Guid baustellenGuid = Guid.Parse(baustellenGuidStr);

                if (baustellenGuid != null)
                {
                    IEnumerable<Baustelle> loadedBaustelle = unitOfWork.BaustelleRepository.Get(x => x.GuidNr.Equals(baustellenGuid));
                    if (loadedBaustelle.Count() == 1) _selectedBaustelle = loadedBaustelle.First();
                }
            }
        }
        private void InitRegistry()
        {
            Registry.CurrentUser.CreateSubKey("Software\\Cosysda\\KanSan");
            LadeRegistry();
        }
        public MainWindowViewModel()
        {
            LadeRegistry();
        }
    }
}