namespace HeuristicLab.Tests.Interpreter.Expressions {
  using System;
  using System.Collections.Generic;
  using System.Diagnostics;
  using System.Linq;

  using HeuristicLab.Problems.ProgramSynthesis.Push.Expressions;
  using HeuristicLab.Problems.ProgramSynthesis.Push.Parser;

  using Microsoft.VisualStudio.TestTools.UnitTesting;

  [TestClass]
  public class StandardTests {
    [TestMethod]
    public void TestGetHashCode() {
      var expressionTypes = from domainAssembly in AppDomain.CurrentDomain.GetAssemblies()
                            from assemblyType in domainAssembly.GetTypes()
                            where
                            !assemblyType.IsAbstract && assemblyType.IsSubclassOf(typeof(Expression))
                            && (assemblyType.GetConstructor(Type.EmptyTypes) != null)
                            select assemblyType;

      var expressions = expressionTypes.Select(et => Activator.CreateInstance(et) as Expression);
      var ids = expressions.Select(e => new { Epxression = e, Id = e.GetHashCode() });

      var duplicates = ids.GroupBy(s => s).SelectMany(grp => grp.Skip(1));

      if (!duplicates.Any())
        return;

      Debug.WriteLine("Duplicates: ");
      foreach (var duplicate in duplicates)
        Debug.WriteLine("Id: {0}, Expression: {1}", duplicate.Id, duplicate.Epxression);

      Assert.Fail();
    }

    [TestMethod]
    public void TestExpandGetHashCode() {
      var expand = PushParser.Parse("( A B C D E F )");

      expand.GetHashCode();
    }

    [TestMethod]
    public void TestExecExpandCopy() {
      var expressions = new Expression[]
                          {
                            new IntegerPushExpression(2), new FloatPushExpression(2.0),
                            new BooleanPushExpression(true), new NameDefineXExecExpression("A")
                          };

      var list = new PushProgram(expressions);
      var clone = list.Copy();

      Assert.AreNotSame(list, clone);
      Assert.AreEqual(list, clone);
    }

    [TestMethod]
    public void TestExecExpandRecursiveCopy() {
      var expressions = new List<Expression>
                          {
                            new IntegerPushExpression(2),
                            new FloatPushExpression(2.1),
                            new BooleanPushExpression(true),
                            new NameDefineXExecExpression("A")
                          };

      var list = new PushProgram(expressions.ToArray());

      expressions.Add(list);

      var list2 = new PushProgram(expressions.ToArray());
      var clone = list2.Copy();

      Assert.AreSame(list, clone.Expressions.Last());
      Assert.AreEqual(list, clone.Expressions.Last());

      Assert.AreNotSame(list2, clone);
      Assert.AreEqual(list2, clone);
    }

    [TestMethod]
    public void TestExecExpandRecursiveGetHashCode() {
      var expressions = new List<Expression>
                          {
                            new IntegerPushExpression(2),
                            new FloatPushExpression(2.0),
                            new BooleanPushExpression(true),
                            new NameDefineXExecExpression("A")
                          };

      var list = new PushProgram(expressions.ToArray());

      expressions.Add(list);
      var list2 = new PushProgram(expressions.ToArray());
      var list3 = new PushProgram(expressions.ToArray());

      Assert.AreEqual(list2.GetHashCode(), list3.GetHashCode());
    }
  }
}