using System.Windows.Forms;

namespace HeuristicLab.Problems.ProgramSynthesis.Push.Views {
  using System.Collections.Generic;
  using System.Linq;

  using HeuristicLab.Problems.ProgramSynthesis.Push.Expressions;

  public partial class PushProgramTreeView : TreeView {
    private const string PushProgramStringFormat = "List {0}@{1}";
    private const string EmptyList = "Empty List";

    public PushProgramTreeView() {
      InitializeComponent();

      ShowNodeToolTips = true;
    }

    public void LoadExpressions(IEnumerable<Expression> expressions) {
      Nodes.Clear();
      AddExpressions(expressions);
    }

    public void AddExpressions(IEnumerable<Expression> expressions) {
      var nodes = expressions.Select(ToTreeNode).ToArray();
      Nodes.AddRange(nodes);
    }

    private TreeNode ToTreeNode(Expression expression) {
      var node = new TreeNode {
        Text = GetNodeText(expression),
        Tag = expression,
      };

      if (expression.IsProgram) {
        var program = (PushProgram)expression;
        var subNodes = program.Expressions.Reverse().Select(ToTreeNode).ToArray();

        node.Nodes.AddRange(subNodes);
      } else {
        var type = expression.GetType();
        var attribute = ExpressionTable.TypeToAttributeTable[type];

        node.ToolTipText = attribute.Description;
      }

      return node;
    }

    private string GetNodeText(Expression expression) {
      if (expression.IsProgram) {
        var program = (PushProgram)expression;

        if (program.IsEmpty)
          return EmptyList;

        return string.Format(PushProgramStringFormat, program.TotalInstructionCount, program.Depth);
      }

      return expression.StringRepresentation;
    }
  }
}