namespace HeuristicLab.Tests.Interpreter.Expressions {
  using HeuristicLab.Problems.ProgramSynthesis.Push.Expressions;
  using HeuristicLab.Problems.ProgramSynthesis.Push.Parser;
  using HeuristicLab.Problems.ProgramSynthesis.Push.Stack;

  using Microsoft.VisualStudio.TestTools.UnitTesting;

  [TestClass]
  public class ExecExpressionTests : CommonTests<Expression> {
    protected override string TypeName
    {
      get
      {
        return "EXEC";
      }
    }

    protected override IPushStack<Expression> Stack
    {
      get
      {
        return this.interpreter.ExecStack;
      }
    }

    protected override void Test(Expression expression) {
      this.interpreter.Run(expression, true);
      this.interpreter.Step();
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("ExecExpressionTest")]
    public void TestIfTrue() {
      this.interpreter.BooleanStack.Push(true);
      this.interpreter.Run("( EXEC.IF WAHR FALSCH )");

      Assert.AreEqual("WAHR", this.interpreter.NameStack.Top);
      this.TestStackCounts(nameStack: 1);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("ExecExpressionTest")]
    public void TestIfFalse() {
      this.interpreter.BooleanStack.Push(false);
      this.interpreter.Run("( EXEC.IF WAHR FALSCH )");

      Assert.AreEqual("FALSCH", this.interpreter.NameStack.Top);
      this.TestStackCounts(nameStack: 1);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("ExecExpressionTest")]
    public void TestK() {
      var first = PushParser.Parse("A");
      var second = PushParser.Parse("B");
      var third = PushParser.Parse("C");

      interpreter.ExecStack.Push(third, second, first);
      Test(new ExecKExpression());

      Assert.AreEqual(first, interpreter.ExecStack.Top);
      Assert.AreEqual(third, interpreter.ExecStack.Bottom);
      TestStackCounts(2);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("ExecExpressionTest")]
    public void TestS() {
      var first = PushParser.Parse("A");
      var second = PushParser.Parse("B");
      var third = PushParser.Parse("C");
      var result = PushParser.Parse("( B C )");

      this.interpreter.ExecStack.Push(third, second, first);
      this.Test(new ExecSExpression());

      Assert.AreEqual(result, this.interpreter.ExecStack[2]);
      Assert.AreEqual(third, this.interpreter.ExecStack[1]);
      Assert.AreEqual(first, this.interpreter.ExecStack.Top);
      this.TestStackCounts(3);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("ExecExpressionTest")]
    public void TestY() {
      var first = PushParser.Parse("A");
      var result = PushParser.Parse("( EXEC.Y A )");

      this.interpreter.ExecStack.Push(first);
      this.Test(new ExecYExpression());

      Assert.AreEqual(first, this.interpreter.ExecStack.Top);
      Assert.AreEqual(result, this.interpreter.ExecStack[1]);
      this.TestStackCounts(2);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("ExecExpressionTest")]
    public void TestNestedDoRange() {
      this.interpreter.Run(
        "( 0 2 EXEC.DO*RANGE ( 1 INTEGER.+ 0 3 EXEC.DO*RANGE ( 1 INTEGER.+ INTEGER.* ) INTEGER.+ )");

      Assert.AreEqual(144, this.interpreter.IntegerStack.Top);
      this.TestStackCounts(integerStack: 1);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("ExecExpressionTest")]
    public void TestNestedDoCount() {
      this.interpreter.Run(
        "( 2 EXEC.DO*COUNT ( 1 INTEGER.+ 3 EXEC.DO*COUNT ( 1 INTEGER.+ INTEGER.* ) INTEGER.+ )");

      Assert.AreEqual(144, this.interpreter.IntegerStack.Top);
      this.TestStackCounts(integerStack: 1);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("ExecExpressionTest")]
    public void TestNestedDoTimes() {
      this.interpreter.Run("( 3 EXEC.DO*TIMES ( 2 3 EXEC.DO*TIMES ( 2 INTEGER.* ) INTEGER.+ )");

      Assert.AreEqual(128, this.interpreter.IntegerStack.Top);
      this.TestStackCounts(integerStack: 1);
    }

    protected override Expression[] GetValues(int count) {
      var values = new Expression[count];

      for (var i = 0; i < count; i++) values[i] = new CodeNoopExpression();

      return values;
    }

    protected override Expression[] Get2Different() {
      return new Expression[] { new CodeNoopExpression(), new CodeNullExpression() };
    }

    protected override void CheckOtherStacksAreEmpty() {
      this.TestStackCounts(null);
    }
  }
}