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";
      tbRemaining.Text = "0";
      tbPercentage.Text = "0%";
    }

    private void InitData()
    {
        checkedFilterView.Content = Content.Filters;
        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)
      {
        InitData();
        UpdateFilterInfo();
      }
    }

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

    private void UpdateFilterInfo() {
        List<IFilter> filters = Content.Filters.ToList();
        int activeFilters = filters.Count(c => c.Active);
        applyFilterButton.Enabled = (activeFilters > 0);
        rBtnAnd.Enabled = (activeFilters > 0);
        rBtnOr.Enabled = (activeFilters > 0);
        Content.FilterLogic.Reset();
        bool[] result = Content.FilterLogic.Preview(filters, rBtnAnd.Checked);

        int filteredCnt = result.Count(c => !c);

        tbRemaining.Text = filteredCnt.ToString();
        double percentage = result.Length == 0 ? 0.0 : filteredCnt * 100 / (double)result.Length;
        tbPercentage.Text = String.Format("{0:0.0000}%", percentage);
        tbTotal.Text = result.Length.ToString();
    }

    private void applyFilterButton_Click(object sender, EventArgs e) {
      if (Content != null)
      {
        List<IFilter> filters = Content.Filters.ToList();
        //apply filters
        Content.FilterLogic.Apply(filters, rBtnAnd.Checked);
        //deactivate checked filters
        filters = checkedFilterView.Content.CheckedItems.ToList();
        foreach (IFilter filter in filters)
        {
          checkedFilterView.Content.SetItemCheckedState(filter, false);
          filter.Active = false;
        }
        UpdateFilterInfo();
      }
    }

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

    private void Content_ItemsRemoved(object sender, CollectionItemsChangedEventArgs<IFilter> e) {
      if (Content != null)
      {
        UpdateFilterInfo();
      }
    }

    private void rBtnAnd_CheckedChanged(object sender, EventArgs e)
    {
      if (Content != null)
      {
        UpdateFilterInfo();
        Content.IsAndCombination = rBtnAnd.Checked;
      }
    }

  }
}