using System.Linq;
using HeuristicLab.Problems.ProgramSynthesis;

namespace HeuristicLab.Tests.Interpreter.Expressions {

  using Microsoft.VisualStudio.TestTools.UnitTesting;

  [TestClass]
  public class StringExpressionTests : CommonTests<string> {
    protected override string TypeName { get { return "STRING"; } }

    protected override IPushStack<string> Stack { get { return interpreter.StringStack; } }

    protected override string[] GetValues(int count) {
      return Enumerable
        .Range(0, count)
        .Select(_ => interpreter.Configuration.ErcOptions.StringErcOptions.GetErcValue(interpreter.Random))
        .ToArray();
    }

    protected override void CheckOtherStacksAreEmpty() {
      TestStackCounts(stringStack: null);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("StringExpressionTest")]
    public void TestFromInteger() {
      interpreter.IntegerStack.Push(123, -123);
      interpreter.Run(new StringFromIntegerExpression());
      interpreter.Run(new StringFromIntegerExpression());
      interpreter.Run(new StringFromIntegerExpression());

      Assert.AreEqual("123", interpreter.StringStack[0]);
      Assert.AreEqual("-123", interpreter.StringStack[1]);
      TestStackCounts(stringStack: 2);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("StringExpressionTest")]
    public void TestFromFloat() {
      interpreter.FloatStack.Push(123.45, -123.45);
      interpreter.Run(new StringFromFloatExpression());
      interpreter.Run(new StringFromFloatExpression());
      interpreter.Run(new StringFromFloatExpression());

      Assert.AreEqual("123.45", interpreter.StringStack[0]);
      Assert.AreEqual("-123.45", interpreter.StringStack[1]);
      TestStackCounts(stringStack: 2);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("StringExpressionTest")]
    public void TestFromBoolean() {
      interpreter.BooleanStack.Push(true, false);
      interpreter.Run(new StringFromBooleanExpression());
      interpreter.Run(new StringFromBooleanExpression());

      Assert.AreEqual("True", interpreter.StringStack[0]);
      Assert.AreEqual("False", interpreter.StringStack[1]);
      TestStackCounts(stringStack: 2);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("StringExpressionTest")]
    public void TestFromChar() {
      interpreter.CharStack.Push(' ', 'a');
      interpreter.Run(new StringFromCharExpression());
      interpreter.Run(new StringFromCharExpression());

      Assert.AreEqual(" ", interpreter.StringStack[0]);
      Assert.AreEqual("a", interpreter.StringStack[1]);
      TestStackCounts(stringStack: 2);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("StringExpressionTest")]
    public void TestConcat() {
      interpreter.StringStack.Push("test", "123");
      interpreter.Run(new StringConcatExpression());

      Assert.AreEqual("test123", interpreter.StringStack[0]);
      TestStackCounts(stringStack: 1);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("StringExpressionTest")]
    public void TestConjChar() {
      interpreter.CharStack.Push('3', '2', '1');
      interpreter.StringStack.Push("test");

      interpreter.Run(new StringConjCharExpression());
      interpreter.Run(new StringConjCharExpression());
      interpreter.Run(new StringConjCharExpression());

      Assert.AreEqual("test123", interpreter.StringStack[0]);
      TestStackCounts(stringStack: 1);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("StringExpressionTest")]
    public void TestTake() {
      interpreter.IntegerStack.Push(3, -3, 7, 0);

      interpreter.StringStack.Push("test");
      interpreter.Run(new StringTakeExpression());
      Assert.AreEqual("", interpreter.StringStack[0]);

      interpreter.StringStack.Push("test");
      interpreter.Run(new StringTakeExpression());
      Assert.AreEqual("tes", interpreter.StringStack[0]);

      interpreter.StringStack.Push("test");
      interpreter.Run(new StringTakeExpression());
      Assert.AreEqual("tes", interpreter.StringStack[0]);

      interpreter.StringStack.Push("test");
      interpreter.Run(new StringTakeExpression());
      Assert.AreEqual("tes", interpreter.StringStack[0]);

      TestStackCounts(stringStack: 4);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("StringExpressionTest")]
    public void TestFirst() {
      interpreter.StringStack.Push("test");

      interpreter.Run(new StringFirstExpression());

      Assert.AreEqual("t", interpreter.StringStack[0]);
      TestStackCounts(stringStack: 1);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("StringExpressionTest")]
    public void TestLast() {
      interpreter.StringStack.Push("test");
      interpreter.Run(new StringLastExpression());

      Assert.AreEqual("t", interpreter.StringStack[0]);
      TestStackCounts(stringStack: 1);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("StringExpressionTest")]
    public void TestNth() {
      interpreter.IntegerStack.Push(2, -2, 6);

      interpreter.StringStack.Push("test");
      interpreter.Run(new StringNthExpression());
      Assert.AreEqual("s", interpreter.StringStack[0]);

      interpreter.StringStack.Push("test");
      interpreter.Run(new StringNthExpression());
      Assert.AreEqual("s", interpreter.StringStack[0]);

      interpreter.StringStack.Push("test");
      interpreter.Run(new StringNthExpression());
      Assert.AreEqual("s", interpreter.StringStack[0]);

      TestStackCounts(stringStack: 3);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("StringExpressionTest")]
    public void TestRest() {
      interpreter.StringStack.Push("test");
      interpreter.Run(new StringRestExpression());

      Assert.AreEqual("est", interpreter.StringStack[0]);
      TestStackCounts(stringStack: 1);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("StringExpressionTest")]
    public void TestButLast() {
      interpreter.StringStack.Push("test");
      interpreter.Run(new StringButLastExpression());

      Assert.AreEqual("tes", interpreter.StringStack[0]);
      TestStackCounts(stringStack: 1);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("StringExpressionTest")]
    public void TestLength() {
      interpreter.StringStack.Push("test");
      interpreter.Run(new StringLengthExpression());

      Assert.AreEqual(4, interpreter.IntegerStack.Top);
      TestStackCounts(stringStack: 0, integerStack: 1);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("StringExpressionTest")]
    public void TestReverse() {
      interpreter.StringStack.Push("test");
      interpreter.Run(new StringReverseExpression());

      Assert.AreEqual("tset", interpreter.StringStack[0]);
      TestStackCounts(stringStack: 1);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("StringExpressionTest")]
    public void TestParseToChars() {
      interpreter.StringStack.Push("test");
      interpreter.Run(new StringParseToCharsExpression());

      Assert.AreEqual("t", interpreter.StringStack[0]);
      Assert.AreEqual("s", interpreter.StringStack[1]);
      Assert.AreEqual("e", interpreter.StringStack[2]);
      Assert.AreEqual("t", interpreter.StringStack[3]);
      TestStackCounts(stringStack: 4);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("StringExpressionTest")]
    public void TestSplit() {
      interpreter.StringStack.Push("test1 test2");
      interpreter.Run(new StringSplitExpression());

      Assert.AreEqual("test1", interpreter.StringStack[0]);
      Assert.AreEqual("test2", interpreter.StringStack[1]);
      TestStackCounts(stringStack: 2);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("StringExpressionTest")]
    public void TestEmptyString() {
      interpreter.StringStack.Push("test1", "");
      interpreter.Run(new StringEmptyStringExpression());
      interpreter.Run(new StringEmptyStringExpression());

      Assert.AreEqual(false, interpreter.BooleanStack[0]);
      Assert.AreEqual(true, interpreter.BooleanStack[1]);
      TestStackCounts(stringStack: 0, booleanStack: 2);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("StringExpressionTest")]
    public void TestContains() {
      interpreter.StringStack.Push(new[] { "test1", "est", "test", "abc", "test", "" });
      interpreter.Run(new StringContainsExpression());
      interpreter.Run(new StringContainsExpression());
      interpreter.Run(new StringContainsExpression());

      Assert.AreEqual(true, interpreter.BooleanStack[0]);
      Assert.AreEqual(false, interpreter.BooleanStack[1]);
      Assert.AreEqual(true, interpreter.BooleanStack[2]);
      TestStackCounts(stringStack: 0, booleanStack: 3);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("StringExpressionTest")]
    public void TestContainsChar() {
      interpreter.CharStack.Push('e', 'a');
      interpreter.StringStack.Push("test", "test");
      interpreter.Run(new StringContainsCharExpression());
      interpreter.Run(new StringContainsCharExpression());

      Assert.AreEqual(true, interpreter.BooleanStack[0]);
      Assert.AreEqual(false, interpreter.BooleanStack[1]);
      TestStackCounts(stringStack: 0, charStack: 0, booleanStack: 2);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("StringExpressionTest")]
    public void TestIndexOfChar() {
      interpreter.CharStack.Push('e', 'a');
      interpreter.StringStack.Push("test", "test");
      interpreter.Run(new StringIndexOfCharExpression());
      interpreter.Run(new StringIndexOfCharExpression());

      Assert.AreEqual(1, interpreter.IntegerStack[0]);
      Assert.AreEqual(-1, interpreter.IntegerStack[1]);
      TestStackCounts(stringStack: 0, charStack: 0, integerStack: 2);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("StringExpressionTest")]
    public void TestOccurrencesOfChar() {
      interpreter.CharStack.Push('t', 'a');
      interpreter.StringStack.Push("test", "test");
      interpreter.Run(new StringOccurrencesOfCharExpression());
      interpreter.Run(new StringOccurrencesOfCharExpression());

      Assert.AreEqual(2, interpreter.IntegerStack[0]);
      Assert.AreEqual(0, interpreter.IntegerStack[1]);
      TestStackCounts(stringStack: 0, charStack: 0, integerStack: 2);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("StringExpressionTest")]
    public void TestReplace() {
      interpreter.StringStack.Push("test", "es", "12");
      interpreter.Run(new StringReplaceExpression());
      Assert.AreEqual("t12t", interpreter.StringStack[0]);

      interpreter.StringStack.Push("test test", "es", "12");
      interpreter.Run(new StringReplaceExpression());
      Assert.AreEqual("t12t t12t", interpreter.StringStack[0]);

      interpreter.StringStack.Push("test", "ab", "12");
      interpreter.Run(new StringReplaceExpression());
      Assert.AreEqual("test", interpreter.StringStack[0]);

      interpreter.StringStack.Push("test", "", "12");
      interpreter.Run(new StringReplaceExpression());
      Assert.AreEqual("test", interpreter.StringStack[0]);

      interpreter.StringStack.Push("test", "ab", "");
      interpreter.Run(new StringReplaceExpression());
      Assert.AreEqual("test", interpreter.StringStack[0]);

      interpreter.StringStack.Push("test", "es", "");
      interpreter.Run(new StringReplaceExpression());
      Assert.AreEqual("tt", interpreter.StringStack[0]);

      TestStackCounts(stringStack: 6);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("StringExpressionTest")]
    public void TestReplaceFirst() {
      interpreter.StringStack.Push("test", "es", "12");
      interpreter.Run(new StringReplaceFirstExpression());
      Assert.AreEqual("t12t", interpreter.StringStack[0]);

      interpreter.StringStack.Push("test test", "es", "12");
      interpreter.Run(new StringReplaceFirstExpression());
      Assert.AreEqual("t12t test", interpreter.StringStack[0]);

      interpreter.StringStack.Push("test", "ab", "12");
      interpreter.Run(new StringReplaceFirstExpression());
      Assert.AreEqual("test", interpreter.StringStack[0]);

      interpreter.StringStack.Push("test", "", "12");
      interpreter.Run(new StringReplaceFirstExpression());
      Assert.AreEqual("test", interpreter.StringStack[0]);

      interpreter.StringStack.Push("test", "ab", "");
      interpreter.Run(new StringReplaceFirstExpression());
      Assert.AreEqual("test", interpreter.StringStack[0]);

      interpreter.StringStack.Push("test", "es", "");
      interpreter.Run(new StringReplaceFirstExpression());
      Assert.AreEqual("tt", interpreter.StringStack[0]);

      TestStackCounts(stringStack: 6);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("StringExpressionTest")]
    public void TestReplaceChar() {
      interpreter.StringStack.Push("test");
      interpreter.CharStack.Push('t', 'T');
      interpreter.Run(new StringReplaceCharExpression());
      Assert.AreEqual("TesT", interpreter.StringStack[0]);

      interpreter.StringStack.Push("test");
      interpreter.CharStack.Push('a', 'T');
      interpreter.Run(new StringReplaceCharExpression());
      Assert.AreEqual("test", interpreter.StringStack[0]);

      interpreter.StringStack.Push("");
      interpreter.CharStack.Push('t', 'T');
      interpreter.Run(new StringReplaceCharExpression());
      Assert.AreEqual("", interpreter.StringStack[0]);

      TestStackCounts(stringStack: 3);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("StringExpressionTest")]
    public void TestReplaceFirstChar() {
      interpreter.StringStack.Push("test");
      interpreter.CharStack.Push('t', 'T');
      interpreter.Run(new StringReplaceFirstCharExpression());
      Assert.AreEqual("Test", interpreter.StringStack[0]);

      interpreter.StringStack.Push("test");
      interpreter.CharStack.Push('a', 'T');
      interpreter.Run(new StringReplaceFirstCharExpression());
      Assert.AreEqual("test", interpreter.StringStack[0]);

      interpreter.StringStack.Push("");
      interpreter.CharStack.Push('t', 'T');
      interpreter.Run(new StringReplaceFirstCharExpression());
      Assert.AreEqual("", interpreter.StringStack[0]);

      TestStackCounts(stringStack: 3);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("StringExpressionTest")]
    public void TestRemoveChar() {
      interpreter.StringStack.Push("test");
      interpreter.CharStack.Push('t');
      interpreter.Run(new StringRemoveCharExpression());
      Assert.AreEqual("es", interpreter.StringStack[0]);

      interpreter.StringStack.Push("test");
      interpreter.CharStack.Push('a');
      interpreter.Run(new StringRemoveCharExpression());
      Assert.AreEqual("test", interpreter.StringStack[0]);

      interpreter.StringStack.Push("");
      interpreter.CharStack.Push('t');
      interpreter.Run(new StringRemoveCharExpression());
      Assert.AreEqual("", interpreter.StringStack[0]);

      TestStackCounts(stringStack: 3);
    }

    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("StringExpressionTest")]
    public void TestSetChar() {
      interpreter.StringStack.Push("test");
      interpreter.CharStack.Push('x');
      interpreter.IntegerStack.Push(2);
      interpreter.Run(new StringSetCharExpression());
      Assert.AreEqual("text", interpreter.StringStack[0]);

      interpreter.StringStack.Push("test");
      interpreter.CharStack.Push('x');
      interpreter.IntegerStack.Push(-2);
      interpreter.Run(new StringSetCharExpression());
      Assert.AreEqual("text", interpreter.StringStack[0]);

      interpreter.StringStack.Push("test");
      interpreter.CharStack.Push('x');
      interpreter.IntegerStack.Push(6);
      interpreter.Run(new StringSetCharExpression());
      Assert.AreEqual("text", interpreter.StringStack[0]);

      interpreter.StringStack.Push("");
      interpreter.CharStack.Push('x');
      interpreter.IntegerStack.Push(2);
      interpreter.Run(new StringSetCharExpression());
      Assert.AreEqual("", interpreter.StringStack[0]);

      interpreter.StringStack.Push("s");
      interpreter.CharStack.Push('x');
      interpreter.IntegerStack.Push(2);
      interpreter.Run(new StringSetCharExpression());
      Assert.AreEqual("x", interpreter.StringStack[0]);

      TestStackCounts(stringStack: 5);
    }


    [TestMethod]
    [TestProperty("Time", "Short")]
    [TestCategory("ExpressionTest")]
    [TestCategory("StringExpressionTest")]
    public void TestIterate() {
      interpreter.StringStack.Push("test");
      interpreter.IntegerStack.Push(0);
      interpreter.Run(new PushProgram(new Expression[] {
        new IntegerIncExpression(),
        new StringIterateExpression(),
      }));

      Assert.AreEqual(4, interpreter.IntegerStack[0]);
      TestStackCounts(integerStack: 1, charStack: 4);
    }
  }
}