using System;
using System.Linq;
using HeuristicLab.Core.Views;
using HeuristicLab.Data;
using HeuristicLab.MainForm;

namespace HeuristicLab.Problems.MetaOptimization.Views.ValueConfigurationViews {
  [View("IOptimizable View")]
  [Content(typeof(IOptimizable), IsDefaultView = false)]
  [Content(typeof(ParameterConfiguration), IsDefaultView = true)]
  [Content(typeof(ValueConfiguration), IsDefaultView = true)]
  public sealed partial class OptimizableView : ItemView {
    public new IOptimizable Content {
      get { return (IOptimizable)base.Content; }
      set { base.Content = value; }
    }

    public OptimizableView() {
      InitializeComponent();
    }

    protected override void DeregisterContentEvents() {
      Content.OptimizeChanged -= new EventHandler(Content_OptimizeChanged);
      Content.IsOptimizableChanged -= new EventHandler(Content_IsOptimizabeChanged);
      base.DeregisterContentEvents();
    }

    protected override void RegisterContentEvents() {
      base.RegisterContentEvents();
      Content.IsOptimizableChanged += new EventHandler(Content_IsOptimizabeChanged);
      Content.OptimizeChanged += new EventHandler(Content_OptimizeChanged);
    }

    #region Event Handlers (Content)
    void Content_OptimizeChanged(object sender, EventArgs e) {
      if (InvokeRequired) {
        Invoke(new EventHandler(Content_OptimizeChanged), sender, e);
      } else {
        this.optimizeCheckBox.Checked = Content.Optimize;
        if (Content.Optimize) {
          this.viewHost.ViewType = null;

          var pc = Content as IParameterConfiguration;
          var vc = Content as IValueConfiguration;

          if (pc != null) {
            if (pc is SingleValuedParameterConfiguration) {
              this.viewHost.Content = ((ParameterizedValueConfiguration)pc.ValueConfigurations.Single()).ParameterConfigurations;
            } else {
              this.viewHost.Content = pc.ValueConfigurations;
            }
          } else if (vc != null) {
            var rvc = Content as RangeValueConfiguration;
            if (rvc != null) {
              if (Content.ActualValue.ValueDataType == typeof(IntValue) ||
                Content.ActualValue.ValueDataType == typeof(DoubleValue) ||
                Content.ActualValue.ValueDataType == typeof(PercentValue)) {
                this.viewHost.ViewsLabelVisible = true;
                this.viewHost.Content = rvc.RangeConstraint;
              } else if (Content.ActualValue.ValueDataType == typeof(BoolValue)) {
                this.viewHost.Content = null; // no configuration required
              }
            }

            var pvc = Content as ParameterizedValueConfiguration;
            if (pvc != null) {
              this.viewHost.ViewsLabelVisible = false;
              this.viewHost.Content = pvc.ParameterConfigurations;
            }

            //var symbolicVc = Content as SymbolicExpressionGrammarValueConfiguration;
            //if (symbolicVc != null) {
            //  this.viewHost.ViewsLabelVisible = false;
            //  this.viewHost.Content = symbolicVc.ParameterConfigurations;
            //}
          } else {
            throw new NotSupportedException("Only IParameterConfiguration and IValueConfiguration types are allowed.");
          }
        } else {
          this.viewHost.ViewsLabelVisible = false;
          this.viewHost.Content = Content.ActualValue;
        }
      }
      SetEnabledStateOfControls();
    }
    void Content_IsOptimizabeChanged(object sender, EventArgs e) {
      if (InvokeRequired) {
        Invoke(new EventHandler(Content_IsOptimizabeChanged), sender, e);
      } else {
        SetEnabledStateOfControls();
      }
    }
    #endregion

    protected override void OnContentChanged() {
      base.OnContentChanged();
      if (Content != null) {
        Content_OptimizeChanged(this, EventArgs.Empty);
      } else {
        this.viewHost.Content = null;
      }
    }

    protected override void SetEnabledStateOfControls() {
      base.SetEnabledStateOfControls();
      if (Content != null) {
        this.optimizeCheckBox.Enabled = !this.ReadOnly && Content.IsOptimizable;
      }
    }

    #region Event Handlers (child controls)
    private void optimizeCheckBox_CheckedChanged(object sender, EventArgs e) {
      Content.Optimize = optimizeCheckBox.Checked;
    }
    #endregion
  }
}