using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using HeuristicLab.MainForm.WPF;
using System.Windows.Controls;
using System.Windows;
using HeuristicLab.BackgroundProcessing;
using System.Diagnostics;
using System.IO;
using HeuristicLab.Persistence.Default.Xml;
using HeuristicLab.Persistence.Core;
using System.Collections.ObjectModel;
using HeuristicLab.MainForm;
using System.Data;
using HeuristicLab.OKB.Client;

namespace HeuristicLab.OKB.Cockpit.Admin {

  public partial class AlgorithmEditor : UserControl, IView, IOKBCockpitItem {

    public static DependencyProperty AlgorithmProperty = DependencyProperty.Register(
      "Algorithm", typeof(OKBAdmin.Algorithm), typeof(AlgorithmEditor));

    public OKBAdmin.Algorithm Algorithm {
      get { return (OKBAdmin.Algorithm)GetValue(AlgorithmProperty); }
      set { SetValue(AlgorithmProperty, value); }
    }

    public AlgorithmEditor() {
      InitializeComponent();
      Algorithm = null;
    }

    protected override void OnPropertyChanged(DependencyPropertyChangedEventArgs e) {
      base.OnPropertyChanged(e);
      if (e.Property == AlgorithmProperty)
        UpdateAlgorithm();
    }

    private void UpdateAlgorithm() {
      if (Algorithm == null) {
        Clear();
        return;
      }
      OnLoad(this, new RoutedEventArgs());
    }

    private void Clear() {
      IdBox.Text = null;
      NameBox.Text = null;
      DescriptionBox.Text = null;
    }

    private bool isLoading = false;
    protected void OnLoad(object sender, RoutedEventArgs args) {
      if (isLoading || Algorithm == null) return;
      isLoading = true;
      OKBAdmin.Algorithm algorithm = Algorithm;
      OperatorGraphEditorHost editor = OperatorGraphEditor;
      var loader = new ObservableBackgroundWorker("downloading algorithm") {
        WorkerReportsProgress = true,
        WorkerSupportsCancellation = true,
      };
      loader.DoWork += (s, a) => {
        OKBAdmin.AdminServiceClient client = ClientFactory.Create<OKBAdmin.AdminServiceClient, OKBAdmin.IAdminService>();
        algorithm = client.GetCompleteAlgorithm(algorithm.Id);
        client.Close();
        loader.ReportProgress(10);
        byte[] data = new DataClientHelper(loader, a) {
          ReportProgress = p => loader.ReportProgress(10 + 80 * p / 100)
        }.Load(OKBData.EntityType.Algorithm, algorithm.Id);
        if (data != null) {
          editor.LoadData(data, algorithm.Platform, OperatorGraphEditorHost.EditorType.Algorithm);
          loader.ReportProgress(100);
        }
      };
      loader.RunWorkerCompleted += (s, a) => {
        if (algorithm == null) return;
        Algorithm = algorithm;
        IdBox.Text = Algorithm.Id.ToString();
        NameBox.Text = Algorithm.Name;
        DescriptionBox.Text = Algorithm.Description;
        isLoading = false;
      };
      loader.RunWorkerAsync();
    }

    protected void OnSave(object sender, RoutedEventArgs args) {
      if (Algorithm == null) return;
      Algorithm.Name = NameBox.Text;
      Algorithm.Description = DescriptionBox.Text;
      OKBAdmin.Algorithm algorithm = Algorithm;
      OperatorGraphEditorHost editor = OperatorGraphEditor;
      var saver = new ObservableBackgroundWorker("uploading algorithm") {
        WorkerReportsProgress = true,
        WorkerSupportsCancellation = true,
      };
      saver.DoWork += (s, a) => {
        OKBAdmin.AdminServiceClient client = ClientFactory.Create<OKBAdmin.AdminServiceClient, OKBAdmin.IAdminService>();
        client.UpdateCompleteAlgorithm(algorithm);
        client.Close();
        saver.ReportProgress(10);
        byte[] data = editor.GetAlgorithmData();
        if (data != null) {
          saver.ReportProgress(20);
          new DataClientHelper(saver, a) {
            ReportProgress = p => saver.ReportProgress(20 + 80 * p / 100)
          }.Save(OKBData.EntityType.Algorithm, algorithm.Id, data);
        } else {
          saver.ReportProgress(100);
        }
      };
      saver.RunWorkerAsync();
    }

    private IEnumerable<T> GetObjects<T>(DataTable table, IEnumerable<string> propertyNames) where T : class {
      foreach (DataRow row in table.Rows) {
        if (row["Id"] != DBNull.Value) {
          T o = Activator.CreateInstance<T>();
          foreach (string name in propertyNames)
            typeof(T).GetProperty(name).SetValue(o, row[name] == DBNull.Value ? null : (object)row[name], null);
          yield return o;
        }
      }
    }

    private bool ContentHasParameter(OKBAdmin.Parameter p) {
      return Algorithm.Algorithm_Parameters.Any(ap => ap.ParameterId == p.Id);
    }

    private bool ContentHasResult(OKBAdmin.Result result) {
      return Algorithm.Algorithm_Results.Any(ar => ar.ResultId == result.Id);
    }

    protected void OnView(object sender, EventArgs args) {
      if (sender == ParametersButton && Algorithm != null)
        EntityEditorSupport.ShowSelector<OKBAdmin.Parameter>(ContentHasParameter, UpdateParameters);
      if (sender == ResultsButton && Algorithm != null)
        EntityEditorSupport.ShowSelector<OKBAdmin.Result>(ContentHasResult, UpdateResults);
    }

    private void UpdateParameters(IEnumerable<OKBAdmin.Parameter> parameters) {
      Algorithm.Algorithm_Parameters.Clear();
      foreach (OKBAdmin.Parameter p in parameters) {
        Algorithm.Algorithm_Parameters.Add(new OKBAdmin.Algorithm_Parameter() {
          AlgorithmId = Algorithm.Id,
          ParameterId = p.Id,
        });
      }
    }

    private void UpdateResults(IEnumerable<OKBAdmin.Result> results) {
      Algorithm.Algorithm_Results.Clear();
      foreach (OKBAdmin.Result r in results) {
        Algorithm.Algorithm_Results.Add(new OKBAdmin.Algorithm_Result() {
          AlgorithmId = Algorithm.Id,
          ResultId = r.Id,
        });
      }
    }

    private void OnDownload(object sender, EventArgs args) {
      PersistenceHacker.Download(OKBData.EntityType.Algorithm, Algorithm.Id);
    }

    private void OnUpload(object sender, EventArgs args) {
      PersistenceHacker.Upload(OKBData.EntityType.Algorithm, Algorithm.Id);
    }

    #region IView Members

    public string Caption {
      get { return "Algorithm Editor"; }
      set { throw new NotSupportedException(); }
    }    

    public event EventHandler CaptionChanged;

    public event EventHandler Changed;

    protected void OnChanged() {
      EventHandler handler = CaptionChanged;
      if (handler != null)
        handler(this, EventArgs.Empty);
    }

    public virtual void Close() {
      MainFormManager.GetMainForm<WPFMainFormBase>().CloseView(this);
      IsShown = false;
    }

    public void Hide() {
      MainFormManager.GetMainForm<WPFMainFormBase>().HideView(this);
      IsShown = false;
    }

    public bool IsShown { get; protected set; }

    private bool readOnly = false;
    public bool ReadOnly {
      get {
        return readOnly;
      }
      set {
        if (value == readOnly) return;
        readOnly = value;
        OnReadOnlyChanged();
      }
    }
    public event EventHandler ReadOnlyChanged;
    protected void OnReadOnlyChanged() {
      EventHandler handler = ReadOnlyChanged;
      if (handler != null)
        handler(this, EventArgs.Empty);
    }

    public void Show() {
      MainFormManager.GetMainForm<WPFMainFormBase>().ShowView(this);
      IsShown = true;
    }

    #endregion    
  }
}