unit Test.Myc.Ast.Tuples;

interface

uses
    DUnitX.TestFramework,
    System.SysUtils,
    Myc.Ast.Environment,
    Myc.Ast.Script,
    Myc.Data.Value,
    Myc.Data.Scalar,
    Myc.Ast.Nodes, // For EAstException/EEvaluatorException if needed
    Myc.Ast.Evaluator;

type
    [TestFixture]
    [IgnoreMemoryLeaks]
    TTestTuples = class
    private
        FEnv: TAstEnvironment;
        function Run(const Code: string): TDataValue;
    public
        [Setup]
        procedure Setup;
        [TearDown]
        procedure TearDown;

        // --- Basic Literals ---
        [Test]
        procedure Test_EmptyTuple;
        [Test]
        procedure Test_SingleElement;
        [Test]
        procedure Test_HomogeneousVector;
        [Test]
        procedure Test_HeterogeneousTuple;

        // --- Indexing (Get) ---
        [Test]
        [TestCase('Index0', '[10 20 30],0,10')]
        [TestCase('Index1', '[10 20 30],1,20')]
        [TestCase('Index2', '[10 20 30],2,30')]
        procedure Test_Indexing(const Script, IndexStr, ExpectedStr: string);

        [Test]
        procedure Test_Indexing_OutOfBounds;

        // --- Nesting (Matrices) ---
        [Test]
        procedure Test_Matrix_2x2;
        [Test]
        procedure Test_Jagged_Array; // Not a matrix, but a tuple of tuples

        // --- Complex Expressions inside Tuples ---
        [Test]
        procedure Test_Expressions_Inside_Tuple;
        [Test]
        procedure Test_Tuple_Inside_Block;

        // --- Variable Binding ---
        [Test]
        procedure Test_Def_And_Access;
    end;

implementation

uses
    Myc.Ast.Scope; // For IExecutionScope

{ TTestTuples }

procedure TTestTuples.Setup;
begin
    // Create a fresh standard environment for each test
    FEnv := TAstEnvironment.Construct(nil);
    FEnv.SetStandardMode;
end;

procedure TTestTuples.TearDown;
begin
    // Interfaces represent the env, automatic cleanup handled by ARC
    FEnv := Default(TAstEnvironment);
end;

function TTestTuples.Run(const Code: string): TDataValue;
begin
    // Parse, Compile, Link, Run pipeline
    var ast := TAstScript.Parse(Code);
    Result := FEnv.Run(ast);
end;

procedure TTestTuples.Test_EmptyTuple;
begin
    var res := Run('[]');
    Assert.AreEqual(TDataValueKind.vkTuple, res.Kind);
    Assert.AreEqual(0, res.AsTuple.Count);
end;

procedure TTestTuples.Test_SingleElement;
begin
    var res := Run('[42]');
    Assert.AreEqual(TDataValueKind.vkTuple, res.Kind);
    Assert.AreEqual(1, res.AsTuple.Count);
    Assert.AreEqual<Int64>(42, res.AsTuple[0].AsScalar.Value.AsInt64);
end;

procedure TTestTuples.Test_HomogeneousVector;
begin
    // [1 2 3 4]
    var res := Run('[1 2 3 4]');
    Assert.AreEqual(TDataValueKind.vkTuple, res.Kind);
    Assert.AreEqual(4, res.AsTuple.Count);
    Assert.AreEqual<Int64>(4, res.AsTuple[3].AsScalar.Value.AsInt64);
end;

procedure TTestTuples.Test_HeterogeneousTuple;
begin
    // [1 "Text" 3.14]
    var res := Run('[1 "Text" 3.14]');
    Assert.AreEqual(TDataValueKind.vkTuple, res.Kind);
    var tpl := res.AsTuple;

    Assert.AreEqual(3, tpl.Count);

    // Check types
    Assert.AreEqual(TDataValueKind.vkScalar, tpl[0].Kind);
    Assert.AreEqual(TDataValueKind.vkText, tpl[1].Kind);
    Assert.AreEqual(TDataValueKind.vkScalar, tpl[2].Kind);

    // Check values
    Assert.AreEqual<Int64>(1, tpl[0].AsScalar.Value.AsInt64);
    Assert.AreEqual('Text', tpl[1].AsText);
    Assert.AreEqual(3.14, tpl[2].AsScalar.Value.AsDouble, 0.0001);
end;

procedure TTestTuples.Test_Indexing(const Script, IndexStr, ExpectedStr: string);
begin
    // (get [10 20 30] 1) -> 20
    var code := Format('(get %s %s)', [Script, IndexStr]);
    var res := Run(code);

    Assert.AreEqual(TDataValueKind.vkScalar, res.Kind);
    Assert.AreEqual<Int64>(StrToInt64(ExpectedStr), res.AsScalar.Value.AsInt64);
end;

procedure TTestTuples.Test_Indexing_OutOfBounds;
begin
    // Should throw exception
    Assert.WillRaise(procedure begin Run('(get [1 2] 5)'); end, EEvaluatorException);

    Assert.WillRaise(procedure begin Run('(get [1 2] -1)'); end, EEvaluatorException);
end;

procedure TTestTuples.Test_Matrix_2x2;
begin
    // [[1 2] [3 4]]
    // This tests the parser's ability to handle nested brackets and the evaluator's reconstruction.
    var res := Run('[[1 2] [3 4]]');
    Assert.AreEqual(TDataValueKind.vkTuple, res.Kind);

    var outer := res.AsTuple;
    Assert.AreEqual(2, outer.Count);

    var row0 := outer[0].AsTuple;
    var row1 := outer[1].AsTuple;

    Assert.AreEqual<Int64>(1, row0[0].AsScalar.Value.AsInt64);
    Assert.AreEqual<Int64>(2, row0[1].AsScalar.Value.AsInt64);
    Assert.AreEqual<Int64>(3, row1[0].AsScalar.Value.AsInt64);
    Assert.AreEqual<Int64>(4, row1[1].AsScalar.Value.AsInt64);
end;

procedure TTestTuples.Test_Jagged_Array;
begin
    // [[1] [2 3]] -> Valid tuple of tuples, but not a matrix in strict sense (though runtime handles it as nested tuples)
    var res := Run('[[1] [2 3]]');
    Assert.AreEqual(2, res.AsTuple.Count);
    Assert.AreEqual(1, res.AsTuple[0].AsTuple.Count);
    Assert.AreEqual(2, res.AsTuple[1].AsTuple.Count);
end;

procedure TTestTuples.Test_Expressions_Inside_Tuple;
begin
    // [(+ 1 2) (* 10 2)] -> [3 20]
    var res := Run('[(+ 1 2) (* 10 2)]');

    Assert.AreEqual(2, res.AsTuple.Count);
    Assert.AreEqual<Int64>(3, res.AsTuple[0].AsScalar.Value.AsInt64);
    Assert.AreEqual<Int64>(20, res.AsTuple[1].AsScalar.Value.AsInt64);
end;

procedure TTestTuples.Test_Tuple_Inside_Block;
begin
    // (do [1 2] [3 4]) -> Should return the last tuple [3 4]
    var res := Run('(do [1 2] [3 4])');
    Assert.AreEqual(TDataValueKind.vkTuple, res.Kind);
    Assert.AreEqual<Int64>(3, res.AsTuple[0].AsScalar.Value.AsInt64);
end;

procedure TTestTuples.Test_Def_And_Access;
begin
    // This mimics the case that previously crashed
    // (do (def x [10 20 30]) (get x 1))
    var code := '(do ' + '  (def x [10 20 30]) ' + '  (get x 1) ' + ')';

    var res := Run(code);
    Assert.AreEqual(TDataValueKind.vkScalar, res.Kind);
    Assert.AreEqual<Int64>(20, res.AsScalar.Value.AsInt64);
end;

initialization
    TDUnitX.RegisterTestFixture(TTestTuples);

end.