#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2008 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
 *
 * This file is part of HeuristicLab.
 *
 * HeuristicLab is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * HeuristicLab is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
 */
#endregion

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using HeuristicLab.Core;
using HeuristicLab.PluginInfrastructure;

namespace HeuristicLab.Functions {
  public partial class FunctionView : ViewBase {
    private IFunction function;

    private IFunction selectedFunction;
    private IVariable selectedVariable;

    private FunctionNameVisitor functionNameVisitor;
    public FunctionView() {
      InitializeComponent();
      functionNameVisitor = new FunctionNameVisitor();
    }

    public FunctionView(IFunction function)
      : this() {
      this.function = function;
      Refresh();
    }

    protected override void UpdateControls() {
      functionTreeView.Nodes.Clear();
      function.Accept(functionNameVisitor);
      TreeNode rootNode = new TreeNode();
      rootNode.Name = function.Name;
      rootNode.Text = functionNameVisitor.Name;
      rootNode.Tag = function;
      rootNode.ContextMenuStrip = treeNodeContextMenu;
      functionTreeView.Nodes.Add(rootNode);

      foreach(IFunction subFunction in function.SubFunctions) {
        CreateTree(rootNode, subFunction);
      }
      functionTreeView.ExpandAll();
    }

    private void CreateTree(TreeNode rootNode, IFunction function) {
      TreeNode node = new TreeNode();
      function.Accept(functionNameVisitor);
      node.Tag = function;
      node.Name = function.Name;
      node.Text = functionNameVisitor.Name;
      node.ContextMenuStrip = treeNodeContextMenu;
      rootNode.Nodes.Add(node);
      foreach(IFunction subFunction in function.SubFunctions) {
        CreateTree(node, subFunction);
      }
    }

    private void functionTreeView_AfterSelect(object sender, TreeViewEventArgs e) {
      variablesListBox.Items.Clear();
      variablesSplitContainer.Panel2.Controls.Clear();
      templateTextBox.Clear();
      editButton.Enabled = false;
      if(functionTreeView.SelectedNode != null && functionTreeView.SelectedNode.Tag != null) {
        IFunction selectedFunction = (IFunction)functionTreeView.SelectedNode.Tag;
        UpdateVariablesList(selectedFunction);
        templateTextBox.Text = selectedFunction.MetaObject.Name;
        this.selectedFunction = selectedFunction;
        editButton.Enabled = true;
      }
    }

    private void UpdateVariablesList(IFunction function) {
      foreach(IVariable variable in function.LocalVariables) {
        variablesListBox.Items.Add(variable.Name);
      }
    }

    private void variablesListBox_SelectedIndexChanged(object sender, EventArgs e) {
      // in case we had an event-handler registered for a different variable => unregister the event-handler
      if(selectedVariable != null) {
        selectedVariable.Value.Changed -= new EventHandler(selectedVariable_ValueChanged);
      }
      if(variablesListBox.SelectedItem != null) {
        string selectedVariableName = (string)variablesListBox.SelectedItem;
        selectedVariable = selectedFunction.GetVariable(selectedVariableName);
        variablesSplitContainer.Panel2.Controls.Clear();
        Control editor = (Control)selectedVariable.CreateView();
        variablesSplitContainer.Panel2.Controls.Add(editor);
        editor.Dock = DockStyle.Fill;
        // register an event handler that updates the treenode when the value of the variable is changed by the user
        selectedVariable.Value.Changed += new EventHandler(selectedVariable_ValueChanged);
      } else {
        variablesSplitContainer.Panel2.Controls.Clear();
      }
    }

    void selectedVariable_ValueChanged(object sender, EventArgs e) {
      if(functionTreeView.SelectedNode != null && functionTreeView.SelectedNode.Tag != null) {
        TreeNode node = functionTreeView.SelectedNode;
        selectedFunction.Accept(functionNameVisitor);
        node.Text = functionNameVisitor.Name;
      }
    }

    private void editButton_Click(object sender, EventArgs e) {
      OperatorBaseView operatorView = new OperatorBaseView(selectedFunction.MetaObject);
      PluginManager.ControlManager.ShowControl(operatorView);
    }

    private void copyToClipboardMenuItem_Click(object sender, EventArgs e) {
      TreeNode node = functionTreeView.SelectedNode;
      if(node == null || node.Tag == null) return;

      ModelAnalyzerExportVisitor visitor = new ModelAnalyzerExportVisitor();
      ((IFunction)node.Tag).Accept(visitor);
      Clipboard.SetText(visitor.ModelAnalyzerPrefix);
    }

    private class FunctionNameVisitor : IFunctionVisitor {
      string name;

      public string Name {
        get { return name; }
      }

      #region IFunctionVisitor Members

      public void Visit(IFunction function) {
        name = function.Name;
      }

      public void Visit(Addition addition) {
        name = "+";
      }

      public void Visit(Constant constant) {
        name = constant.Value + "";
      }

      public void Visit(Cosinus cosinus) {
        name = "Sin";
      }

      public void Visit(Division division) {
        name = "/";
      }

      public void Visit(Exponential exponential) {
        name = "Exp";
      }

      public void Visit(Logarithm logarithm) {
        name = "Log";
      }

      public void Visit(Multiplication multiplication) {
        name = "*";
      }

      public void Visit(Power power) {
        name = "Pow";
      }

      public void Visit(Signum signum) {
        name = "Sign";
      }

      public void Visit(Sinus sinus) {
        name = "Sin";
      }

      public void Visit(Sqrt sqrt) {
        name = "Sqrt";
      }

      public void Visit(Substraction substraction) {
        name = "-";
      }

      public void Visit(Tangens tangens) {
        name = "Tan";
      }

      public void Visit(Variable variable) {
        string timeOffset = "";
        if(variable.SampleOffset < 0) {
          timeOffset = "(t" + variable.SampleOffset + ")";
        } else if(variable.SampleOffset > 0) {
          timeOffset = "(t+" + variable.SampleOffset + ")";
        } else {
          timeOffset = "";
        }
        name = "Var" + variable.VariableIndex + timeOffset + " * " + variable.Weight;
      }

      public void Visit(And and) {
        name = "And";
      }

      public void Visit(Average average) {
        name = "Avg";
      }

      public void Visit(IfThenElse ifThenElse) {
        name = "IFTE";
      }

      public void Visit(Not not) {
        name = "Not";
      }

      public void Visit(Or or) {
        name = "Or";
      }

      public void Visit(Xor xor) {
        name = "Xor";
      }

      public void Visit(Equal equal) {
        name = "eq?";
      }

      public void Visit(LessThan lessThan) {
        name = "<";
      }

      #endregion
    }

    private class ModelAnalyzerExportVisitor : IFunctionVisitor {
      private string prefix;
      private string currentIndend = "";
      public string ModelAnalyzerPrefix {
        get { return prefix; }
      }
      public void Reset() {
        prefix = "";
      }

      private void VisitFunction(string name, IFunction f) {
        prefix += currentIndend + "[F]"+name+"(\n";
        currentIndend += "  ";
        foreach(IFunction subFunction in f.SubFunctions) {
          subFunction.Accept(this);
          prefix += ";\n";
        }
        prefix = prefix.TrimEnd(';','\n');
        prefix += ")";
        currentIndend = currentIndend.Remove(0, 2);
      }

      #region IFunctionVisitor Members

      public void Visit(IFunction function) {
        prefix += function.Name;
      }

      public void Visit(Addition addition) {
        VisitFunction("Addition[0]", addition);
      }

      public void Visit(Constant constant) {
        prefix += currentIndend + "[T]Constant(" + constant.Value.Data.ToString() + ";0;0)";
      }

      public void Visit(Cosinus cosinus) {
        VisitFunction("Trigonometrics[1]", cosinus);
      }

      public void Visit(Division division) {
        VisitFunction("Division[0]", division);
      }

      public void Visit(Exponential exponential) {
        VisitFunction("Exponential[0]", exponential);
      }

      public void Visit(Logarithm logarithm) {
        VisitFunction("Logarithm[0]", logarithm);
      }

      public void Visit(Multiplication multiplication) {
        VisitFunction("Multiplication[0]", multiplication);
      }

      public void Visit(Power power) {
        VisitFunction("Power[0]", power);
      }

      public void Visit(Signum signum) {
        VisitFunction("Signum[0]", signum);
      }

      public void Visit(Sinus sinus) {
        VisitFunction("Trigonometrics[0]", sinus);
      }

      public void Visit(Sqrt sqrt) {
        VisitFunction("Sqrt[0]", sqrt);
      }

      public void Visit(Substraction substraction) {
        VisitFunction("Substraction[0]", substraction);
      }

      public void Visit(Tangens tangens) {
        VisitFunction("Trigonometrics[2]", tangens);
      }

      public void Visit(HeuristicLab.Functions.Variable variable) {
        prefix += currentIndend + "[T]Variable(" + variable.Weight + ";" + variable.VariableIndex + ";" + -variable.SampleOffset + ")";
      }

      public void Visit(And and) {
        VisitFunction("Logical[0]", and);
      }

      public void Visit(Average average) {
        VisitFunction("N/A (average)", average);
      }

      public void Visit(IfThenElse ifThenElse) {
        VisitFunction("Conditional[0]", ifThenElse);
      }

      public void Visit(Not not) {
        VisitFunction("Logical[2]", not);
      }

      public void Visit(Or or) {
        VisitFunction("Logical[1]", or);
      }

      public void Visit(Xor xor) {
        VisitFunction("N/A (xor)", xor);
      }

      public void Visit(Equal equal) {
        VisitFunction("Boolean[2]", equal);
      }

      public void Visit(LessThan lessThan) {
        VisitFunction("Boolean[0]", lessThan);
      }

      #endregion
    }

  }
}