using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using HeuristicLab.Collections;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Data;
using HeuristicLab.Optimization;
using HeuristicLab.Parameters;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
using ICSharpCode.SharpZipLib.Zip;

namespace HeuristicLab.Analysis.FitnessLandscape.BoxCharts {

  [Item("Box Chart Creator", "Visualizes essential run information by creating an overview chart.")]
  [StorableClass]
  public class BoxChartCreator : ParameterizedNamedItem, IRunCollectionModifier {

    public enum AppendModes { None, Horizontal, Vertical };

    #region Parameters
    public ValueParameter<StringValue> ChartNameParameter {
      get { return (ValueParameter<StringValue>)Parameters["ChartName"]; }
    }
    public ValueParameter<CheckedItemList<IBoxChartElementGenerator>> ElementsParameter {
      get { return (ValueParameter<CheckedItemList<IBoxChartElementGenerator>>)Parameters["Elements"]; }
    }
    public ValueParameter<IntValue> SizeParameter {
      get { return (ValueParameter<IntValue>)Parameters["Size"]; }
    }
    public ValueParameter<IntValue> PaddingParameter {
      get { return (ValueParameter<IntValue>)Parameters["Padding"]; }
    }
    public ValueParameter<StringValue> ZipFileNameParameter {
      get { return (ValueParameter<StringValue>)Parameters["ZipFileName"]; }
    }
    public IConstrainedValueParameter<StringValue> AppendModeParameter {
      get { return (IConstrainedValueParameter<StringValue>)Parameters["AppendMode"]; }
    }
    #endregion

    #region Parameter Values
    protected string ChartName { get { return ChartNameParameter.Value.Value; } }
    protected string ZipFileName { get { return ZipFileNameParameter.Value.Value; } }
    protected int Size { get { return SizeParameter.Value.Value; } }
    protected int Padding { get { return PaddingParameter.Value.Value; } }
    protected AppendModes AppendMode { get { return (AppendModes)Enum.Parse(typeof(AppendModes), AppendModeParameter.Value.Value); } }
    protected List<IBoxChartElementGenerator> Generators {
      get {
        return ElementsParameter.Value.CheckedItems.Select(i => i.Value).ToList();
      }
    }
    #endregion

    #region Construction & Cloning
    [StorableConstructor]
    protected BoxChartCreator(bool deserializing) : base(deserializing) { }
    protected BoxChartCreator(BoxChartCreator original, Cloner cloner)
      : base(original, cloner) {
      RegisterEvents();
    }
    public BoxChartCreator() {
      Parameters.Add(new ValueParameter<StringValue>("ChartName", "The result name of the chart.", new StringValue("Chart")));
      Parameters.Add(new ValueParameter<CheckedItemList<IBoxChartElementGenerator>>("Elements", "List of patient chart element generators.", new CheckedItemList<IBoxChartElementGenerator>()));
      Parameters.Add(new ValueParameter<IntValue>("Size", "The size of one box in pixels.", new IntValue(50)));
      Parameters.Add(new ValueParameter<IntValue>("Padding", "The padding inside the boxes", new IntValue(1)));
      Parameters.Add(new ValueParameter<StringValue>("ZipFileName", "The name of the zip file that will contain all generated charts.", new StringValue("")));
      Parameters.Add(new ConstrainedValueParameter<StringValue>("AppendMode", "Determines how coordinates of new elements are calculated.",
        new ItemSet<StringValue>(Enum.GetNames(typeof(AppendModes)).Select(v => new StringValue(v)))));
      AppendModeParameter.Value = AppendModeParameter.ValidValues.SingleOrDefault(v => v.Value == AppendModes.Horizontal.ToString());
      RegisterEvents();
    }
    public override IDeepCloneable Clone(Cloner cloner) {
      return new BoxChartCreator(this, cloner);
    }
    [StorableHook(HookType.AfterDeserialization)]
    private void AfterDeserialization() {
      if (!Parameters.ContainsKey("ZipFileName"))
        Parameters.Add(new ValueParameter<StringValue>("ZipFileName", "The name of the zip file that will contain all generated charts.", new StringValue("")));
      if (!Parameters.ContainsKey("AppendMode")) {
        Parameters.Add(new ConstrainedValueParameter<StringValue>("AppendMode", "Determines how coordinates of new elements are calculated.",
          new ItemSet<StringValue>(Enum.GetNames(typeof(AppendModes)).Select(v => new StringValue(v)))));
        AppendModeParameter.Value = AppendModeParameter.ValidValues.SingleOrDefault(v => v.Value == AppendModes.Horizontal.ToString());
      }
      RegisterEvents();
    }
    #endregion

    private void RegisterEvents() {
      ElementsParameter.ValueChanged += ElementsParameter_ValueChanged;
      ElementsParameter.Value.ItemsAdded += ElementsParameter_Value_ItemsAdded;
    }

    private void ElementsParameter_ValueChanged(object sender, EventArgs e) {
      ElementsParameter.Value.ItemsAdded += ElementsParameter_Value_ItemsAdded;
    }

    private void ElementsParameter_Value_ItemsAdded(object sender, CollectionItemsChangedEventArgs<IndexedItem<IBoxChartElementGenerator>> e) {
      if (sender != ElementsParameter.Value) {
        var oldParameter = sender as ICheckedItemList<IBoxChartElementGenerator>;
        if (oldParameter != null)
          oldParameter.ItemsAdded -= ElementsParameter_Value_ItemsAdded;
      } else {
        var generators = Generators;
        var newItems = e.Items.Select(kvp => kvp.Value).ToList();
        switch (AppendMode) {
          case AppendModes.Horizontal:
            foreach (var generator in newItems) {
              generator.Y = generators.Max(g => g.Y + g.RowSpan - 1);
              generator.X = generators.Where(g => g.Y + g.RowSpan - 1 == generator.Y).Max(g => g.X + g.ColSpan);
            }
            break;
          case AppendModes.Vertical:
            foreach (var generator in newItems) {
              generator.X = generators.Max(g => g.X + g.ColSpan - 1);
              generator.Y = generators.Where(g => g.X + g.ColSpan - 1 == generator.X).Max(g => g.Y + g.RowSpan);
            }
            break;
        }
      }
    }

    #region IRunCollectionModifier Members

    public void Modify(List<IRun> runs) {
      var bitmaps = new Dictionary<string, Bitmap>();
      var generators = Generators;
      var maxX = generators.Max(g => g.X + g.ColSpan);
      var maxY = generators.Max(g => g.Y + g.RowSpan);
      for (int i = 0; i < runs.Count; i++) {
        var run = runs[i];
        var b = new Bitmap(maxX * Size, maxY * Size);
        using (var g = Graphics.FromImage(b)) {
          g.FillRectangle(SystemBrushes.Control, 0, 0, b.Width, b.Height);
          foreach (var gen in generators) {
            g.SetClip(new Rectangle(gen.X * Size + Padding, gen.Y * Size + Padding, gen.ColSpan * Size - 2 * Padding, gen.RowSpan * Size - 2 * Padding));
            gen.Draw(run, g);
            g.ResetClip();
          }
        }
        run.Results[ChartName] = new BitmapItem(b);
        bitmaps.Add(string.Format("{0}.png", run.Name), (Bitmap)b.Clone());
      }
      SaveAllBitmaps(bitmaps);
    }

    private void SaveAllBitmaps(Dictionary<string, Bitmap> bitmaps) {
      if (ZipFileNameParameter.Value == null && string.IsNullOrEmpty(ZipFileName))
        return;
      var filename = ZipFileName;
      if (!filename.ToLowerInvariant().EndsWith("zip"))
        filename = string.Format("{0}.zip", filename);
      using (var stream = File.Create(filename)) {
        using (var zipStream = new ZipOutputStream(stream)) {
          foreach (var bitmap in bitmaps) {
            zipStream.PutNextEntry(new ZipEntry(bitmap.Key) { DateTime = DateTime.Now });
            using (var s = new MemoryStream()) {
              bitmap.Value.Save(s, ImageFormat.Png);
              zipStream.Write(s.ToArray(), 0, (int)s.Length);
            }
          }
        }
      }
    }

    #endregion

  }
}