using System;
using System.Collections.Generic;
using System.Globalization;
using System.Xml;
using HeuristicLab.Core;
using System.Text;
using HeuristicLab.Visualization.LabelProvider;

namespace HeuristicLab.Visualization{
  public delegate void DataRowAddedHandler(IDataRow row);
  public delegate void DataRowRemovedHandler(IDataRow row);
  public delegate void ModelChangedHandler();

  public class ChartDataRowsModel : ChartDataModelBase, IChartDataRowsModel{
    private string title = "Title";
    //private string xAxisLabel;
    private ILabelProvider labelProvider = new ContinuousLabelProvider("0.##");

    public ILabelProvider XAxisLabelProvider {
      get { return labelProvider; }
      set{
        this.labelProvider = value;
        OnModelChanged();
      }
    }


    private readonly List<IDataRow> rows = new List<IDataRow>();
    //private readonly List<string> xLabels = new List<string>();

    //public List<string> XLabels{
    //  get { return xLabels; }
    //}

    public List<IDataRow> Rows{
      get { return rows; }
    }

    public string Title {
      get { return title; }
      set {
        title = value;
        OnModelChanged();
      }
    }
    //public string XAxisLabel {
    //  get { return xAxisLabel; }
    //  set {
    //    xAxisLabel = value;
    //    OnModelChanged();
    //  }
    //}

    public override IView CreateView() {
      return new LineChart(this);
    }

    //public void AddLabel(string label) {
    //  xLabels.Add(label);
    //  OnModelChanged();
    //}

    //public void AddLabel(string label, int index) {
    //  xLabels[index] = label;
    //  OnModelChanged();
    //}

    //public void AddLabels(string[] labels) {
    //  foreach (var s in labels){
    //    AddLabel(s);
    //  }
    //  //OnModelChanged();
    //}

    //public void AddLabels(string[] labels, int index) {
    //  int i = 0;
    //  foreach (var s in labels){
    //    AddLabel(s, index + i);
    //    i++;
    //  }
    //  //OnModelChanged();
    //}

    //public void ModifyLabel(string label, int index) {
    //  xLabels[index] = label;
    //  OnModelChanged();
    //}

    //public void ModifyLabels(string[] labels, int index) {
    //  int i = 0;
    //  foreach (var s in labels){
    //    ModifyLabel(s, index + i);
    //    i++;
    //  }
    //  //OnModelChanged();
    //}

    //public void RemoveLabel(int index) {
    //  xLabels.RemoveAt(index);
    //  OnModelChanged();
    //}

    //public void RemoveLabels(int index, int count) {
    //  for (int i = index; i < index + count; i++ ){
    //    RemoveLabel(i);
    //  }
    //  //OnModelChanged();
    //}

    public void AddDataRow(IDataRow row) {
      rows.Add(row);
      OnDataRowAdded(row);
    }

    public void RemoveDataRow(IDataRow row) {
      rows.Remove(row);
      OnDataRowRemoved(row);
    }

    // TODO implement calculation of max data row values
    public int MaxDataRowValues {
      get {
        int max = 0;

        foreach (IDataRow row in rows) {
          max = Math.Max(max, row.Count);
        }

        return max;
      }
    }

    public event ModelChangedHandler ModelChanged;

    protected void OnModelChanged() {
      if (ModelChanged != null) {
        ModelChanged();
      }
    }

    public event DataRowAddedHandler DataRowAdded;

    protected void OnDataRowAdded(IDataRow row) {
      if (DataRowAdded != null) {
        DataRowAdded(row);
      }
    }

    public event DataRowRemovedHandler DataRowRemoved;

    protected void OnDataRowRemoved(IDataRow row) {
      if (DataRowRemoved != null) {
        DataRowRemoved(row);
      }
    }

    public override XmlNode GetXmlNode(string name, XmlDocument document, IDictionary<Guid, IStorable> persistedObjects) {
      XmlNode node = base.GetXmlNode(name, document, persistedObjects);

      foreach (IDataRow row in rows) {
        XmlNode columnElement = document.CreateNode(XmlNodeType.Element, "row", null);

        XmlAttribute idAttr = document.CreateAttribute("label");
        idAttr.Value = row.Label;
        columnElement.Attributes.Append(idAttr);

        StringBuilder builder = new StringBuilder();

        for (int i = 0; i < row.Count; i++) {
          if (i == 0) {
            builder.Append(row[i].ToString(CultureInfo.InvariantCulture.NumberFormat));
            //columnElement.InnerText += row[i].ToString(CultureInfo.InvariantCulture.NumberFormat);
          } else {
            builder.Append(";" + row[i].ToString(CultureInfo.InvariantCulture.NumberFormat));
            //columnElement.InnerText += ";" + row[i].ToString(CultureInfo.InvariantCulture.NumberFormat);
          }
        }
        columnElement.InnerText += builder.ToString();
        node.AppendChild(columnElement);
      }
      return node;    
    }

    public override void Populate(XmlNode node, IDictionary<Guid, IStorable> restoredObjects) {
      base.Populate(node, restoredObjects);

      foreach (XmlNode dataRow in node.ChildNodes) {
        XmlAttributeCollection attrs = dataRow.Attributes;
        XmlAttribute rowIdAttr = (XmlAttribute)attrs.GetNamedItem("label");
        string rowLabel = rowIdAttr.Value;
        DataRow row = new DataRow();
        row.Label = rowLabel;

        string[] tokens = dataRow.InnerText.Split(';');
        double[] data = new double[tokens.Length];
        for (int i = 0; i < data.Length; i++) {
          if (tokens[i].Length != 0) {
            if (
              double.TryParse(tokens[i], NumberStyles.Float, CultureInfo.InvariantCulture.NumberFormat, out data[i]) ==
              false) {
              throw new FormatException("Can't parse " + tokens[i] + " as double value.");
            }
          }
        }
        row.AddValues(data);

        AddDataRow(row);
      }
    }
  }
}