unit TestDataRecord;

interface

uses
    DunitX.TestFramework,
    System.SysUtils,
    System.DateUtils,
    Myc.DataRecord;

type
    // A record that contains all supported data types for testing
    TMyTestRecord = record
        MyInteger: Integer;
        MyInt64: Int64;
        MySingle: Single;
        MyDouble: Double;
        MyString: string;
        MyTimestamp: TDateTime;
    end;

    [TestFixture]
    TTestDataRecord = class(TObject)
    public
        [Test]
        procedure TestLayoutCreation;

        [Test]
        procedure TestCreateFromInstanceAndGetValue;

        [Test]
        procedure TestSetValueAndGetValue;
    end;

implementation

uses
    System.Rtti;

{ TTestDataRecord }

procedure TTestDataRecord.TestLayoutCreation;
var
    layout: TDataRecord.TRecordLayout;
    idx: Integer;
    expectedSize: Integer;
begin
    // Test: Create layout from a record type
    layout := TDataRecord.TRecordLayout.CreateFrom<TMyTestRecord>;

    // Assert: Check field count
    Assert.IsTrue(Length(layout.Fields) = 6, 'Layout should have 6 fields');

    // Assert: Check specific fields for correct type mapping
    idx := layout.IndexOf('MyInteger');
    Assert.IsTrue(idx > -1, 'Field MyInteger not found');
    Assert.AreEqual(TDataFieldType.dfInteger, layout.Fields[idx].FieldType, 'MyInteger should be mapped to dfInteger');

    idx := layout.IndexOf('MyString');
    Assert.IsTrue(idx > -1, 'Field MyString not found');
    Assert.AreEqual(TDataFieldType.dfString, layout.Fields[idx].FieldType, 'MyString should be mapped to dfString');

    idx := layout.IndexOf('MySingle');
    Assert.IsTrue(idx > -1, 'Field MySingle not found');
    Assert.AreEqual(TDataFieldType.dfFloat, layout.Fields[idx].FieldType, 'MySingle should be mapped to dfFloat');

    idx := layout.IndexOf('MyTimestamp');
    Assert.IsTrue(idx > -1, 'Field MyTimestamp not found');
    Assert.AreEqual(TDataFieldType.dfTimestamp, layout.Fields[idx].FieldType, 'MyTimestamp should be mapped to dfTimestamp');

    // Assert: Check total buffer size (6 fields * 8 bytes each on x64 due to type promotion and alignment)
    expectedSize := (sizeof(Int64) * 2) + (sizeof(Double) * 2) + sizeof(String) + sizeof(TDateTime);
    Assert.AreEqual(expectedSize, layout.GetBufferSize, 'Buffer size calculation is incorrect');
end;

procedure TTestDataRecord.TestCreateFromInstanceAndGetValue;
var
    srcRecord: TMyTestRecord;
    dataRecord: TDataRecord;
begin
    // Setup: Create and populate a source record
    srcRecord.MyInteger := 12345;
    srcRecord.MyInt64 := 9876543210;
    srcRecord.MySingle := 123.456;
    srcRecord.MyDouble := 789.012345;
    srcRecord.MyString := 'Hello Delphi!';
    srcRecord.MyTimestamp := EncodeDateTime(2024, 7, 19, 10, 30, 0, 0);

    // Test: Create a TDataRecord from the source record instance
    dataRecord := TDataRecord.CreateFrom<TMyTestRecord>(srcRecord);

    // Assert: Retrieve each value and check for correctness
    Assert.AreEqual(srcRecord.MyInt64, dataRecord.GetValue<Int64>('MyInt64'), 'Int64 value mismatch');
    Assert.AreEqual(srcRecord.MyInteger, dataRecord.GetValue<Integer>('MyInteger'), 'Integer value mismatch');
    Assert.AreEqual(srcRecord.MyString, dataRecord.GetValue<string>('MyString'), 'String value mismatch');
    Assert.AreEqual(srcRecord.MyTimestamp, dataRecord.GetValue<TDateTime>('MyTimestamp'), 'TDateTime value mismatch');

    // Assert: Check float values with a tolerance for precision differences
    Assert.AreEqual(srcRecord.MySingle, dataRecord.GetValue<Single>('MySingle'), 1e-6, 'Single value mismatch');
    Assert.AreEqual(srcRecord.MyDouble, dataRecord.GetValue<Double>('MyDouble'), 1e-9, 'Double value mismatch');

    // Assert: Test type promotion (reading an Integer as Int64)
    Assert.IsTrue(srcRecord.MyInteger = dataRecord.GetValue<Int64>('MyInteger'), 'Integer to Int64 promotion failed');
end;

procedure TTestDataRecord.TestSetValueAndGetValue;
var
    dataRecord: TDataRecord;
    testInt: Integer;
    testInt64: Int64;
    testSingle: Single;
    testDouble: Double;
    testString: string;
    testTimestamp: TDateTime;
begin
    // Setup: Create an empty TDataRecord with the layout of TMyTestRecord
    dataRecord := TDataRecord.CreateFrom<TMyTestRecord>;

    // Setup: Define test values
    testInt := 54321;
    testInt64 := 12345678901;
    testSingle := 987.654;
    testDouble := 543.210987;
    testString := 'Testing SetValue';
    testTimestamp := Now;

    // Test: Set values for each field by name
    dataRecord.SetValue<Integer>('MyInteger', testInt);
    dataRecord.SetValue<Int64>('MyInt64', testInt64);
    dataRecord.SetValue<Single>('MySingle', testSingle);
    dataRecord.SetValue<Double>('MyDouble', testDouble);
    dataRecord.SetValue<string>('MyString', testString);
    dataRecord.SetValue<TDateTime>('MyTimestamp', testTimestamp);

    // Assert: Retrieve the values and check if they match what was set
    Assert.AreEqual(testInt, dataRecord.GetValue<Integer>('MyInteger'), 'SetValue failed for Integer');
    Assert.AreEqual(testInt64, dataRecord.GetValue<Int64>('MyInt64'), 'SetValue failed for Int64');
    Assert.AreEqual(testString, dataRecord.GetValue<string>('MyString'), 'SetValue failed for String');
    Assert.AreEqual(testTimestamp, dataRecord.GetValue<TDateTime>('MyTimestamp'), 'SetValue failed for TDateTime');

    Assert.AreEqual(testSingle, dataRecord.GetValue<Single>('MySingle'), 1e-6, 'SetValue failed for Single');
    Assert.AreEqual(testDouble, dataRecord.GetValue<Double>('MyDouble'), 1e-9, 'SetValue failed for Double');
end;

initialization
    TDUnitX.RegisterTestFixture(TTestDataRecord);

end.