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 System.Globalization;
using HeuristicLab.OKB.Client;

namespace HeuristicLab.OKB.Cockpit.Admin {
  public partial class ProblemEditor : UserControl, IView, IOKBCockpitItem {

    public static DependencyProperty ProblemProperty = DependencyProperty.Register(
      "Problem", typeof(OKBAdmin.Problem), typeof(AlgorithmEditor));

    public OKBAdmin.Problem Problem {
      get { return (OKBAdmin.Problem)GetValue(ProblemProperty); }
      set { SetValue(ProblemProperty, value); }
    }

    private Dictionary<int, Type> dataTypes;

    public ProblemEditor() {
      InitializeComponent();
      Problem = null;
      InitializeSolutionRepresentations();
      InitializeDataTypes();
      InitializeProblemCharacteristics();
    }

    protected void InitializeDataTypes() {
      dataTypes = new Dictionary<int, Type>();
      var loader = new TableLoadWorker("DataType", false);
      loader.RunWorkerCompleted += (s, a) => {
        foreach (DataRow row in loader.Table.Rows) {
          try {
            dataTypes.Add((int)row["Id"], Type.GetType((string)row["clrName"]));
          } catch (Exception x) {
            MessageBox.Show(
              String.Format("Could not parse CLR name of database datatype '{0}':\n{1}", row["clrName"], x),
              Caption, MessageBoxButton.OK, MessageBoxImage.Error);
          }
        }
      };
      loader.RunWorkerAsync();
    }

    protected void InitializeProblemCharacteristics() {
      var loader = new TableLoadWorker("ProblemCharacteristic", false);
      loader.RunWorkerCompleted += (s, a) => {
        if (loader.Table != null) {
          loader.Table.Columns.Add(new DataColumn("Value", typeof(string)));
          loader.Table.Columns.Add(new DataColumn("IsSelected", typeof(bool)));
          loader.Table.Columns.Add(new DataColumn("DataType", typeof(Type)));
          foreach (DataRow row in loader.Table.Rows) {
            try {
              row["IsSelected"] = false;
              row["DataType"] = dataTypes[(int)row["DataTypeId"]];
            } catch { }
          }
          ProblemCharacteristicsList.ItemsSource = loader.Table.DefaultView;
        }
      };
      loader.RunWorkerAsync();
    }

    protected void InitializeSolutionRepresentations() {
      var loader = new TableLoadWorker("SolutionRepresentation", false);
      loader.RunWorkerCompleted += (s, a) => {
        if (loader.Table != null) {
          SolutionRepresentationBox.ItemsSource = loader.Table.DefaultView;
        }
      };
      loader.RunWorkerAsync();
    }

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

    private void UpdateProblem() {
      if (Problem == 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) return;
      isLoading = true;
      var loader = new ObservableBackgroundWorker("downloading problem") {
        WorkerSupportsCancellation = true,
        WorkerReportsProgress = true,
      };
      OKBAdmin.Problem problem = Problem;
      loader.DoWork += (s, a) => {
        OKBAdmin.AdminServiceClient client = ClientFactory.Create<OKBAdmin.AdminServiceClient, OKBAdmin.IAdminService>();
        problem = client.GetCompleteProblem(problem.Id);
        client.Close();
        loader.ReportProgress(10);        
        byte[] data = new DataClientHelper(loader, a) {
          ReportProgress = p => loader.ReportProgress(10 + 80 * p / 100),
        }.Load(OKBData.EntityType.Problem, problem.Id);
        if (data != null && !loader.CancellationPending) {
          OperatorGraphEditor.LoadData(data, problem.Platform, OperatorGraphEditorHost.EditorType.Problem);
          loader.ReportProgress(100);
        }
      };
      loader.RunWorkerCompleted += (s, a) => {
        try {
          if (problem == null) return;
          Problem = problem;
          IdBox.Text = Problem.Id.ToString();
          NameBox.Text = Problem.Name;
          DescriptionBox.Text = Problem.Description;
          SolutionRepresentationBox.SelectedItem =
            SolutionRepresentationBox.Items.Cast<DataRowView>()
            .SingleOrDefault(sr => (int)sr["Id"] == Problem.SolutionRepresentation.Id);
          LoadProblemCharacteristics();
        } finally {
          isLoading = false;
        }
      };
      loader.RunWorkerAsync();
    }

    protected void LoadProblemCharacteristics() {
      var pcs = new Dictionary<int, object>();
      foreach (var pc in Problem.IntProblemCharacteristicValues)
        pcs.Add(pc.ProblemCharacteristicId, pc.Value);
      foreach (var pc in Problem.CharProblemCharacteristicValues)
        pcs.Add(pc.ProblemCharacteristicId, pc.Value);
      foreach (var pc in Problem.FloatProblemCharacteristicValues)
        pcs.Add(pc.ProblemCharacteristicId, pc.Value);
      foreach (DataRowView row in ProblemCharacteristicsList.Items) {
        int id = (int)row["Id"];
        if (pcs.ContainsKey(id)) {
          row["IsSelected"] = true;
          row["Value"] = pcs[id].ToString();
        }
      }
    }

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

    private void StoreProblemCharacteristics() {
      Problem.IntProblemCharacteristicValues.Clear();
      Problem.FloatProblemCharacteristicValues.Clear();
      Problem.CharProblemCharacteristicValues.Clear();
      foreach (DataRowView row in ProblemCharacteristicsList.Items) {
        string value = row["Value"] as string;
        if (string.IsNullOrEmpty(value) || !(bool)row["IsSelected"])
          continue;
        try {
          Type dataType = (Type)row["DataType"];
          if (dataType == typeof(int)) {
            Problem.IntProblemCharacteristicValues.Add(new OKBAdmin.IntProblemCharacteristicValue() {
              ProblemId = Problem.Id,
              ProblemCharacteristicId = (int)row["Id"],
              Value = int.Parse((string)row["Value"], CultureInfo.InvariantCulture.NumberFormat),
            });
          } else if (dataType == typeof(double)) {
            Problem.FloatProblemCharacteristicValues.Add(new OKBAdmin.FloatProblemCharacteristicValue() {
              ProblemId = Problem.Id,
              ProblemCharacteristicId = (int)row["Id"],
              Value = double.Parse((string)row["Value"], CultureInfo.InvariantCulture.NumberFormat),
            });
          } else if (dataType == typeof(string)) {
            Problem.CharProblemCharacteristicValues.Add(new OKBAdmin.CharProblemCharacteristicValue() {
              ProblemId = Problem.Id,
              ProblemCharacteristicId = (int)row["Id"],
              Value = (string)row["Value"],
            });
          }
        } catch (Exception x) {
          MessageBox.Show(
            String.Format("Could not create problem characteristic {0} with value {1}:\n{2}",
            row["Name"], row["Value"], x), Caption, MessageBoxButton.OK, MessageBoxImage.Error);
        }
      }
    }

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

    protected void OnViewParameters(object sender, EventArgs args) {
      if (sender == ParametersButton && Problem != null)
        EntityEditorSupport.ShowSelector<OKBAdmin.Parameter>(ContentHasParameter, UpdateParameters);
    }

    private void UpdateParameters(IEnumerable<OKBAdmin.Parameter> parameters) {
      Problem.Problem_Parameters.Clear();
      foreach (OKBAdmin.Parameter p in parameters) {
        Problem.Problem_Parameters.Add(new OKBAdmin.Problem_Parameter() {
          ProblemId = Problem.Id,
          ParameterId = p.Id,
        });
      }
    }

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

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

    #region IView Members

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

    public event EventHandler CaptionChanged;
    public event EventHandler Changed;    

    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
  }
}