using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Windows.Forms;
using System.Windows.Forms.DataVisualization.Charting;

namespace HeuristicLab.Problems.Scheduling.Views {
  public partial class GanttChart : UserControl {

    private IDictionary<int, Color> jobColors = new SortedDictionary<int, Color>();
    private IDictionary<string, int> rowNames = new Dictionary<string, int>();
    

    public GanttChart() {
      InitializeComponent();
      chart.Series[0].YValueType = ChartValueType.Double;
    }

    public void AddJobColor(int jobNr) {
      if (!jobColors.ContainsKey(jobNr)) {
        Random r = new Random(jobNr + 1);
        jobColors[jobNr] = Color.FromArgb (r.Next(256),r.Next(256),r.Next(256));
        chart.Legends[0].CustomItems.Clear();
        if (jobColors.Count > 1) {
          int i = 0;
          foreach (Color c in jobColors.Values) {
            chart.Legends[0].CustomItems.Add(c, "Job#" + (i++));
          }
        }   
      }
    }

    private void AddRowName(string rowName) {
      if (!rowNames.ContainsKey(rowName)) {
        int nextId = rowNames.Count == 0 ? 1 : rowNames.Values.Max() + 1;
        rowNames.Add(rowName, nextId);
      }
    }

    public void AddData(string rowName, int jobNr, double start, double end, string tooltip, bool showLabel = true) {
      AddRowName(rowName);
      var point = new DataPoint(rowNames[rowName], new double[] { start, end });
      point.Color = jobColors[jobNr];
      point.AxisLabel = rowName;
      point.ToolTip = tooltip;
      chart.Series[0].Points.Add(point);
    }

    public void Reset() {
      chart.Series[0].Points.Clear();
      jobColors.Clear();
      chart.Legends[0].CustomItems.Clear();
      rowNames.Clear();
    }

    void chart_MouseClick(object sender, MouseEventArgs e) {
      var pos = e.Location;
      var results = chart.HitTest(pos.X, pos.Y, false, ChartElementType.DataPoint);
      foreach (DataPoint dp in chart.Series[0].Points) {
        Color newColor = Color.FromArgb(255, dp.Color);
        dp.Color = newColor;
      }
      foreach (var result in results) {
        if (result.ChartElementType == ChartElementType.DataPoint) {
          Color currentColor = chart.Series[0].Points[result.PointIndex].Color;
          foreach (DataPoint dp in result.Series.Points) {
            if (dp.Color != currentColor) {
              Color newColor = Color.FromArgb(0, dp.Color);
              dp.Color = newColor;
            }
          }
        }
      }
    }
  }
}