namespace HeuristicLab.Problems.ProgramSynthesis.Push.Expressions {
  using System.Collections.Generic;
  using System.Globalization;
  using Attributes;
  using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
  using HeuristicLab.Problems.ProgramSynthesis.Push.Constants;

  using Interpreter;
  using Stack;

  [StorableClass]
  [PushExpression(StackTypes.Print, "PRINT.NEWLINE", "Pushes an empty string onto the PRINT STACK.")]
  public class PrintNewLineExpression : StatelessExpression {
    public PrintNewLineExpression() { }
    [StorableConstructor]
    protected PrintNewLineExpression(bool deserializing) : base(deserializing) { }

    public override bool IsNoop(IInternalPushInterpreter interpreter) {
      return false;
    }

    public override void Eval(IInternalPushInterpreter interpreter) {
      interpreter.PrintStack.NewLine();
    }
  }

  [StorableClass]
  [PushExpression(StackTypes.Print, "PRINT.ENSURE_NEWLINE", "Pushes an empty string onto the PRINT STACK if current line isn't empty already.")]
  public class PrintEnsureNewLineExpression : StatelessExpression {
    public PrintEnsureNewLineExpression() { }
    [StorableConstructor]
    protected PrintEnsureNewLineExpression(bool deserializing) : base(deserializing) { }

    public override bool IsNoop(IInternalPushInterpreter interpreter) {
      return interpreter.PrintStack.IsCurrentLineEmpty;
    }

    public override void Eval(IInternalPushInterpreter interpreter) {
      interpreter.PrintStack.NewLine();
    }
  }

  [StorableClass]
  public abstract class PrintExpression<T> : StatelessExpression {
    protected PrintExpression() { }

    [StorableConstructor]
    protected PrintExpression(bool deserializing) : base(deserializing) { }

    protected void Eval(IInternalPushInterpreter interpreter, IPushStack<T> stack) {
      var value = stack.Pop();

      interpreter.PrintStack.Push(value);
    }

    protected void EvalVector(IInternalPushInterpreter interpreter, IPushStack<IReadOnlyList<T>> vectorStack) {
      var vector = vectorStack.Pop();

      interpreter.PrintStack.Push(PushEnvironment.VectorStartSymbol);

      if (vector.Count > 0) {
        interpreter.PrintStack.Push(vector[0]);

        for (var i = 1; i < vector.Count; i++) {
          interpreter.PrintStack.Push(PushEnvironment.VectorSeparatorSymbol);
          interpreter.PrintStack.Push(vector[i]);
        }
      }

      interpreter.PrintStack.Push(PushEnvironment.VectorEndSymbol);
    }
  }

  [StorableClass]
  [PushExpression(
    StackTypes.Print,
    "PRINT.PRINTBOOLEAN",
    "Pushes the top BOOLEAN onto the PRINT stack.",
    StackTypes.Boolean)]
  public class BooleanPrintExpression : PrintExpression<bool> {
    public BooleanPrintExpression() { }
    [StorableConstructor]
    protected BooleanPrintExpression(bool deserializing) : base(deserializing) { }

    public override bool IsNoop(IInternalPushInterpreter interpreter) {
      return interpreter.BooleanStack.IsEmpty;
    }

    public override void Eval(IInternalPushInterpreter interpreter) {
      var value = interpreter.BooleanStack.Pop();
      interpreter.PrintStack.Push(value);
    }
  }

  [StorableClass]
  [PushExpression(
    StackTypes.Print,
    "PRINT.PRINTCHAR",
    "Pushes the top CHAR onto the PRINT stack.",
    StackTypes.Char)]
  public class CharPrintExpression : PrintExpression<char> {
    public CharPrintExpression() { }
    [StorableConstructor]
    protected CharPrintExpression(bool deserializing) : base(deserializing) { }

    public override bool IsNoop(IInternalPushInterpreter interpreter) {
      return interpreter.CharStack.IsEmpty;
    }

    public override void Eval(IInternalPushInterpreter interpreter) {
      var value = interpreter.CharStack.Pop();
      interpreter.PrintStack.Push(value);
    }
  }

  [StorableClass]
  [PushExpression(
    StackTypes.Print,
    "PRINT.PRINTEXEC",
    "Pushes the top BOOLEAN onto the EXEC stack.",
    StackTypes.Exec,
    requiredBlockCount: 1)]
  public class ExecPrintExpression : PrintExpression<Expression> {
    public ExecPrintExpression() { }
    [StorableConstructor]
    protected ExecPrintExpression(bool deserializing) : base(deserializing) { }

    public override bool IsNoop(IInternalPushInterpreter interpreter) {
      return interpreter.ExecStack.IsEmpty;
    }

    public override void Eval(IInternalPushInterpreter interpreter) {
      var value = interpreter.ExecStack.Pop();
      interpreter.PrintStack.Push(value);
    }
  }

  [StorableClass]
  [PushExpression(
    StackTypes.Print,
    "PRINT.PRINTFLOAT",
    "Pushes the top FLOAT onto the PRINT stack.",
    StackTypes.Float)]
  public class FloatPrintExpression : PrintExpression<double> {
    public FloatPrintExpression() { }
    [StorableConstructor]
    protected FloatPrintExpression(bool deserializing) : base(deserializing) { }

    public override bool IsNoop(IInternalPushInterpreter interpreter) {
      return interpreter.FloatStack.IsEmpty;
    }

    public override void Eval(IInternalPushInterpreter interpreter) {
      var value = interpreter.FloatStack.Pop();
      var str = value.ToString(interpreter.Configuration.FloatStringFormat, CultureInfo.InvariantCulture);

      interpreter.PrintStack.Push(str);
    }
  }

  [StorableClass]
  [PushExpression(
    StackTypes.Print,
    "PRINT.PRINTINTEGER",
    "Pushes the top INTEGER onto the PRINT stack.",
    StackTypes.Integer)]
  public class IntegerPrintExpression : PrintExpression<long> {
    public IntegerPrintExpression() { }
    [StorableConstructor]
    protected IntegerPrintExpression(bool deserializing) : base(deserializing) { }

    public override bool IsNoop(IInternalPushInterpreter interpreter) {
      return interpreter.IntegerStack.IsEmpty;
    }

    public override void Eval(IInternalPushInterpreter interpreter) {
      var value = interpreter.IntegerStack.Pop();
      interpreter.PrintStack.Push(value);
    }
  }

  [StorableClass]
  [PushExpression(
    StackTypes.Print,
    "PRINT.PRINTSTRING",
    "Pushes the top STRING onto the PRINT stack.",
    StackTypes.String)]
  public class StringPrintExpression : PrintExpression<string> {
    public StringPrintExpression() { }
    [StorableConstructor]
    protected StringPrintExpression(bool deserializing) : base(deserializing) { }

    public override bool IsNoop(IInternalPushInterpreter interpreter) {
      return interpreter.StringStack.IsEmpty;
    }

    public override void Eval(IInternalPushInterpreter interpreter) {
      var value = interpreter.StringStack.Pop();
      interpreter.PrintStack.Push(value);
    }
  }

  [StorableClass]
  [PushExpression(
    StackTypes.Print,
    "PRINT.PRINTINTEGERVECTOR",
    "Pushes the top INTEGER[] onto the PRINT stack.",
    StackTypes.IntegerVector)]
  public class IntegerVectorPrintExpression : PrintExpression<long> {
    public IntegerVectorPrintExpression() { }
    [StorableConstructor]
    protected IntegerVectorPrintExpression(bool deserializing) : base(deserializing) { }

    public override bool IsNoop(IInternalPushInterpreter interpreter) {
      return interpreter.IntegerVectorStack.IsEmpty;
    }

    public override void Eval(IInternalPushInterpreter interpreter) {
      EvalVector(interpreter, interpreter.IntegerVectorStack);
    }
  }

  [StorableClass]
  [PushExpression(
    StackTypes.Print,
    "PRINT.PRINTFLOATVECTOR",
    "Pushes the top FLOAT[] onto the PRINT stack.",
    StackTypes.FloatVector)]
  public class FloatVectorPrintExpression : PrintExpression<double> {
    public FloatVectorPrintExpression() { }
    [StorableConstructor]
    protected FloatVectorPrintExpression(bool deserializing) : base(deserializing) { }

    public override bool IsNoop(IInternalPushInterpreter interpreter) {
      return interpreter.FloatVectorStack.IsEmpty;
    }

    public override void Eval(IInternalPushInterpreter interpreter) {
      EvalVector(interpreter, interpreter.FloatVectorStack);
    }
  }

  [StorableClass]
  [PushExpression(
    StackTypes.Print,
    "PRINT.PRINTSTRINGVECTOR",
    "Pushes the top STRING[] onto the PRINT stack.",
    StackTypes.StringVector)]
  public class StringVectorPrintExpression : PrintExpression<string> {
    public StringVectorPrintExpression() { }
    [StorableConstructor]
    protected StringVectorPrintExpression(bool deserializing) : base(deserializing) { }

    public override bool IsNoop(IInternalPushInterpreter interpreter) {
      return interpreter.StringVectorStack.IsEmpty;
    }

    public override void Eval(IInternalPushInterpreter interpreter) {
      EvalVector(interpreter, interpreter.StringVectorStack);
    }
  }

  [StorableClass]
  [PushExpression(
    StackTypes.Print,
    "PRINT.PRINTBOOLEANVECTOR",
    "Pushes the top BOOLEAN[] onto the PRINT stack.",
    StackTypes.BooleanVector)]
  public class BooleanVectorPrintExpression : PrintExpression<bool> {
    public BooleanVectorPrintExpression() { }
    [StorableConstructor]
    protected BooleanVectorPrintExpression(bool deserializing) : base(deserializing) { }

    public override bool IsNoop(IInternalPushInterpreter interpreter) {
      return interpreter.BooleanVectorStack.IsEmpty;
    }

    public override void Eval(IInternalPushInterpreter interpreter) {
      EvalVector(interpreter, interpreter.BooleanVectorStack);
    }
  }
}