using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using HeuristicLab.Core.Views;
using HeuristicLab.OKB.Client;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.PluginInfrastructure;
using System.Threading;

namespace HeuristicLab.OKB.AlgorithmHost {

  [MainForm.View("ParameterizedNamedItemContainer View")]
  [MainForm.Content(typeof(ParameterizedNamedItemContainer), true)]  
  public partial class ParameterizedNamedItemContainerView : ItemView {

    private Mapping mapping;

    public new ParameterizedNamedItemContainer Content {
      get { return (ParameterizedNamedItemContainer)base.Content; }
      set { base.Content = value; }
    }

    public ParameterizedNamedItemContainerView() {
      mapping = new Mapping();
      InitializeComponent();
      InitializeParameterList();
    }

    public void InitializeParameterList() {
      backgroundWorker.RunWorkerAsync();
    }

    protected override void RegisterContentEvents() {
      base.RegisterContentEvents();
      Content.ItemChanged += new EventHandler(Content_ItemChanged);
    }

    
    protected override void DeregisterContentEvents() {
      Content.ItemChanged -= new EventHandler(Content_ItemChanged);
      base.DeregisterContentEvents();
    }
    
    protected override void OnContentChanged() {
      base.OnContentChanged();
      parameterMappingView.Content = null;
      itemViewHost.Content = null;
      itemViewHost.ViewType = null;
      if (Content == null) {
        mapping.Map = null;
      } else {
        itemViewHost.Content = Content.Item;
        mapping.Map = Content.ParameterMapping;
        parameterMappingView.Content = mapping;
      }
    }

    void Content_ItemChanged(object sender, EventArgs e) {
      OnContentChanged();
    }

    protected void openItemButton_Click(object sender, EventArgs e) {
      openFileDialog.Title = "Open Item";
      if (openFileDialog.ShowDialog(this) == DialogResult.OK) {
        newItemButton.Enabled = openItemButton.Enabled = false;
        itemViewHost.Enabled = false;

        ContentManager.LoadAsync(openFileDialog.FileName, delegate(IStorableContent content, Exception error) {
          try {
            if (error != null) throw error;
            if (content == null) {
              MessageBox.Show(this, "The selected file could not be loaded", "Invalid File", MessageBoxButtons.OK, MessageBoxIcon.Error);
            } else {
              IParameterizedNamedItem item = content as IParameterizedNamedItem;
              if (item == null && item.GetType() != Content.ItemType) {
                MessageBox.Show(this,
                  string.Format("The selected file does not contain an object of type {0}", Content.ItemType.Name),
                  "Invalid File", MessageBoxButtons.OK, MessageBoxIcon.Error);
              } else {
                Content.Item = item;
              }
            }
          } catch (Exception ex) {
            ErrorHandling.ShowErrorDialog(this, ex);
          } finally {
            Invoke(new Action(delegate() {
              itemViewHost.Enabled = true;
              newItemButton.Enabled = openItemButton.Enabled = true;
            }));
          }
        });
      }
    }

    private TypeSelectorDialog itemTypeSelectorDialog;

    protected void newAlgorithmButton_Click(object sender, EventArgs e) {
      if (itemTypeSelectorDialog == null) {
        itemTypeSelectorDialog = new TypeSelectorDialog();
        itemTypeSelectorDialog.Caption = "Select Item";
        itemTypeSelectorDialog.TypeSelector.Caption = "Available Items";
        itemTypeSelectorDialog.TypeSelector.Configure(Content.ItemType, false, true);
      }
      if (itemTypeSelectorDialog.ShowDialog(this) == DialogResult.OK) {
        try {
          Content.Item = (IParameterizedNamedItem)itemTypeSelectorDialog.TypeSelector.CreateInstanceOfSelectedType();
        } catch (Exception ex) {
          ErrorHandling.ShowErrorDialog(this, ex);
        }
      }
    }

    protected DataTable backgroundLoadedParameters = null;

    protected void backgroundWorker_ProgressChanged(object sender, ProgressChangedEventArgs e) {
      if (InvokeRequired)
        Invoke(new ProgressChangedEventHandler(backgroundWorker_ProgressChanged), sender, e);
      else {
        if (e.ProgressPercentage < 100) {
          progressBar.Visible = true;
        } else {
          progressBar.Visible = false;
        }
      }
    }

    protected virtual void backgroundWorker_DoWork(object sender, DoWorkEventArgs e) {
      backgroundWorker.ReportProgress(0);
      var client = ClientFactory.Create<OKBTables.TableServiceClient, OKBTables.ITableService>();
      int count;
      DataTable pars = client.PrepareDataTable(out count, "Parameter");
      pars.BeginLoadData();
      DataTable newRows;
      do {
        newRows = client.GetNextRows(100);
        pars.Merge(newRows);
      } while (newRows != null && newRows.Rows.Count > 0);
      client.FinishFetchingRows();
      client.Close();
      pars.EndLoadData();
      backgroundLoadedParameters = pars;
      backgroundWorker.ReportProgress(100);
    }
 
    protected virtual void backgroundWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) {
      parameterMappingView.Enabled = false;
      if (backgroundLoadedParameters != null) {
        mapping.Values.Clear();
        mapping.Values.Add(null);
        mapping.Values.AddRange(backgroundLoadedParameters.Rows.Cast<DataRow>().Select(r => (string)r["Name"]));
        parameterMappingView.Enabled = true;
      }
    }

    protected virtual void refreshButton_Click(object sender, EventArgs e) {
      InitializeParameterList();
    }
  }
}