using System;
using System.Windows.Forms;
using HeuristicLab.Core.Views;
using HeuristicLab.MainForm;
using HeuristicLab.Encodings.PackingEncoding.PackingPlan;
using HeuristicLab.Problems.BinPacking.Interfaces;
using HeuristicLab.Problems.BinPacking.PackingItem;
using HeuristicLab.Problems.BinPacking.PackingBin;
using HeuristicLab.Problems.BinPacking.Dimensions;
using HeuristicLab.Core;
using HeuristicLab.Data;

namespace HeuristicLab.Problems.BinPacking.Views {
  [View("3-dimensional packing plan View")]
  [Content(typeof(PackingPlan<ThreeDimensionalPacking, CuboidPackingBin, CuboidPackingItem>), true)]
  public partial class PackingPlan3DView : NamedItemView {

    public PackingPlan3DView() {
      InitializeComponent();
      this.nameTextBox.Text = "Packing Plan";
    }


    protected override void DeregisterContentEvents() {
      Content.QualityChanged -= new EventHandler(Content_QualityChanged);
      base.DeregisterContentEvents();
    }
    protected override void RegisterContentEvents() {
      base.RegisterContentEvents();
      Content.QualityChanged += new EventHandler(Content_QualityChanged);
    }

    public new PackingPlan<ThreeDimensionalPacking, CuboidPackingBin, CuboidPackingItem> Content {
      get { return (PackingPlan<ThreeDimensionalPacking, CuboidPackingBin, CuboidPackingItem>)base.Content; }
      set { base.Content = value; }
    }


    protected override void OnContentChanged() {
      base.OnContentChanged();
      binSelection.Items.Clear();
      if (Content == null) { 
        packingPlan3D.InitializeContainer(0, 0, 0);
      } else {
        Content.Name = "Packing Plan";
        for (int i = 0; i < Content.NrOfBins; i++)
          binSelection.Items.Add(i);
        binSelection.SelectedIndex = 0;
        UpdateModel();
        packingPlan3D.StartRendering();
      }
    }

    private void UpdateModel() {
      int currentBin = (binSelection != null && binSelection.SelectedItem != null) ? (int)(binSelection.SelectedItem) : 0;
      var bin = Content.GetPackingBinMeasuresForBinNr(currentBin);
      packingPlan3D.InitializeContainer(bin.Width, bin.Height, bin.Depth);
      int i = 0;
      foreach (var item in Content.PackingItemMeasures) {
        var position = Content.PackingItemPositions[i];
        if (position.AssignedBin == currentBin) 
          packingPlan3D.AddItemToContainer(
            position.Rotated ? item.Depth : item.Width, 
            item.Height, 
            position.Rotated ? item.Width : item.Depth, 
            position.X, position.Y, position.Z, i);
        i++;
      }
    }

    private void binSelection_SelectedIndexChanged(object sender, EventArgs e) {
      UpdateModel();

      itemSelection.SelectedIndex = -1;
      itemSelection.Items.Clear();
      int currentBin = (binSelection != null && binSelection.SelectedItem != null) ? (int)(binSelection.SelectedItem) : 0;
      for (int i = 0; i < Content.PackingItemPositions.Count; i++) {
        if (Content.PackingItemPositions[i].AssignedBin == currentBin)
          itemSelection.Items.Add(i);
      }

      packingPlan3D.Invalidate();
      packingPlan3D.Update();
    }

    private void itemSelection_SelectedIndexChanged(object sender, EventArgs e) {
      UpdateModel();

      int selectedItem = -1;
      if ((itemSelection != null && itemSelection.SelectedItem != null) && Int32.TryParse(itemSelection.SelectedItem.ToString(), out selectedItem)) {
        packingPlan3D.SelectItem(selectedItem);
      } else      
        packingPlan3D.UnselectItem();

      packingPlan3D.Invalidate();
      packingPlan3D.Update();
    }

    private void Content_QualityChanged(object sender, EventArgs e) {
      if (InvokeRequired)
        Invoke(new EventHandler(Content_QualityChanged), sender, e);
      else {
        binSelection.Items.Clear();
        if (Content == null) {
          packingPlan3D.InitializeContainer(0, 0, 0);
        } else {
          Content.Name = "Packing Plan";
          for (int i = 0; i < Content.NrOfBins; i++)
            binSelection.Items.Add(i);
          binSelection.SelectedIndex = 0;
          UpdateModel();
          packingPlan3D.StartRendering();
        }
      }
    }  
  }
}