using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using HeuristicLab.Collections;
using HeuristicLab.Core;
using HeuristicLab.Core.Views;
using HeuristicLab.Data;
using HeuristicLab.DataPreprocessing.Filter;
using HeuristicLab.MainForm;

namespace HeuristicLab.DataPreprocessing.Views {
  [View("CheckedFilterCollection View")]
  [Content(typeof(FilterContent), true)]
  public partial class FilterView : ItemView {

    public FilterView() {
      InitializeComponent();
      tbTotal.Text = "0";
      tbFiltered.Text = "0";
      tbPercentage.Text = "0%";
      checkedFilterView.Content = new CheckedItemCollection<IFilter>();
      checkedFilterView.Content.ItemsAdded += Content_ItemsAdded;
      checkedFilterView.Content.ItemsRemoved += Content_ItemsRemoved;
      checkedFilterView.Content.CheckedItemsChanged += Content_CheckedItemsChanged;
    }

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

    protected override void OnContentChanged()
    {
      base.OnContentChanged();
      if (Content != null)
      {
        ImportFiltersFromContent();
        UpdateFilterInfo();
      }
    }

    private void Content_CheckedItemsChanged(object sender, Collections.CollectionItemsChangedEventArgs<IFilter> e) {
      
      foreach (IFilter filter in e.Items)
      {
        filter.Active = checkedFilterView.Content.ItemChecked(filter);
      }
      UpdateFilterInfo();
      ExportFiltersToContent();
      Refresh();
      ResumeRepaint(true);
    }

    private void UpdateFilterInfo() {
      List<IFilter> filters = checkedFilterView.ItemCollection.ToList<IFilter>();

      int activeFilters = filters.Count(c => c.Active);

      applyFilterButton.Enabled = (activeFilters > 0);
      rBtnAnd.Enabled = (activeFilters > 0);
      rBtnOr.Enabled = (activeFilters > 0);
      btnReset.Enabled = (activeFilters > 0);
      Content.FilterLogic.Reset();
      bool[] result = Content.FilterLogic.Preview(filters, rBtnAnd.Checked);
      
      int filteredCnt = result.Count(c => c);
  
      tbFiltered.Text = filteredCnt.ToString();
      double percentage = result.Length == 0 ? 0.0 : filteredCnt * 100 / result.Length;
      tbPercentage.Text = percentage.ToString() + "%";
      tbTotal.Text = result.Length.ToString();
    }

    private void applyFilterButton_Click(object sender, EventArgs e) {
      List<IFilter> filters = checkedFilterView.ItemCollection.ToList<IFilter>();
      Content.FilterLogic.Apply(filters, rBtnAnd.Checked);
    }

    //whenever a new filter is added the preprocessing data is set to the filter
    private void Content_ItemsAdded(object sender, Collections.CollectionItemsChangedEventArgs<IFilter> e) {
      foreach (IFilter filter in e.Items) {
        filter.ConstrainedValue = Content.FilterLogic.PreprocessingData;
      }
      UpdateFilterInfo();
      ExportFiltersToContent();
    }

    private void Content_ItemsRemoved(object sender, CollectionItemsChangedEventArgs<IFilter> e) {
      UpdateFilterInfo();
      ExportFiltersToContent();
    }

    private void rBtnAnd_CheckedChanged(object sender, EventArgs e)
    {
      UpdateFilterInfo();
      ExportFiltersToContent();
      Content.isAndCombination = rBtnAnd.Checked;
    }

    private void btnReset_Click(object sender, EventArgs e)
    {
      Content.FilterLogic.Reset();
    }

    private void ImportFiltersFromContent()
    {
      checkedFilterView.ItemCollection.AddRange(Content.Filters);

      foreach (IFilter filter in checkedFilterView.ItemCollection) {
        if (filter.Active)
        {
          checkedFilterView.Content.SetItemCheckedState(filter, true);
        }
        else
        {
          checkedFilterView.Content.SetItemCheckedState(filter, false);
        }
        rBtnAnd.Checked = Content.isAndCombination;
        rBtnOr.Checked = !Content.isAndCombination;
      }
    }

    private void ExportFiltersToContent()
    {
      Content.Filters = checkedFilterView.ItemCollection.ToList<IFilter>();
    }
  }
}