unit Myc.Data.Types;

interface

type
    IDataType = interface
        function GetName: String;
        property Name: String read GetName;
    end;

    IDataValue = interface
        function GetDataType: IDataType;
        property DataType: IDataType read GetDataType;
    end;

    IDataOrdinalValue = interface(IDataValue)
        ['{DF512FD0-D513-4B96-9687-C80624E475A4}']
        function GetValue: Int64;
        property Value: Int64 read GetValue;
    end;

    IDataOrdinalType = interface(IDataType)
        ['{BE97F145-3634-4F56-9783-FD2C3DD485CA}']
        function CreateValue(Init: Int64): IDataOrdinalValue;
    end;

    IDataFloatValue = interface(IDataValue)
        ['{A6E1E8B5-B8E5-4F4B-9B2E-8E8E9F8F8B8E}']
        function GetValue: Double;
        property Value: Double read GetValue;
    end;

    IDataFloatType = interface(IDataType)
        ['{B7E2E9B6-B9E6-4F5B-9C3E-9E9E0F9F9C9F}']
        function CreateValue(Init: Double): IDataFloatValue;
    end;

    IDataRecordValue = interface(IDataValue)
        ['{53B63A49-720D-4E3E-8EE5-3EA45BA93E58}']
        function GetItem(Idx: Integer): IDataValue;
        property Items[Idx: Integer]: IDataValue read GetItem; default;
    end;

    TRecordField = record
        Name: string;
        DataType: IDataType;
    public
        constructor Create(const AName: string; const ADataType: IDataType);
    end;

    IDataRecordType = interface(IDataType)
        ['{7A266BA0-B1AF-416B-941F-A730D6EDA333}']
        function GetFieldCount: Integer;
        function GetField(Idx: Integer): TRecordField;
        function IndexOf(const AName: string): Integer;
        function CreateValue(const AItems: array of IDataValue): IDataRecordValue;
        property FieldCount: Integer read GetFieldCount;
        property Fields[Idx: Integer]: TRecordField read GetField; default;
    end;

    IDataTupleValue = interface(IDataValue)
        ['{E1D5B0D1-8A1C-4B7E-9F2D-3A4B5C6D7E8F}']
        function GetItemCount: Integer;
        function GetItem(Idx: Integer): IDataValue;
        property ItemCount: Integer read GetItemCount;
        property Items[Idx: Integer]: IDataValue read GetItem; default;
    end;

    IDataTupleType = interface(IDataType)
        ['{9442043E-99AC-4464-99E4-75F1BE1F3118}']
    end;

    IDataArrayValue = interface(IDataValue)
        ['{1F3A4B5C-6D7E-4F1A-8B9C-0D1E2F3A4B5C}']
        function GetElementCount: Integer;
        function GetItem(Idx: Integer): IDataValue;
        property ElementCount: Integer read GetElementCount;
        property Items[Idx: Integer]: IDataValue read GetItem; default;
    end;

    IDataArrayType = interface(IDataType)
        ['{7E8F9A0B-C1D2-4E3F-A4B5-C6D7E8F9A0B1}']
        function GetElementType: IDataType;
        function CreateValue(const AItems: array of IDataValue): IDataArrayValue;
        property ElementType: IDataType read GetElementType;
    end;

    TDataType = record
    private
        FDataType: IDataType;
        function GetName: String; inline;
    public
        constructor Create(const ADataType: IDataType);

        class operator Implicit(const A: IDataType): TDataType; overload;
        class operator Implicit(const A: TDataType): IDataType; overload;

        property DataType: IDataType read FDataType;
        property Name: String read GetName;
    end;

    TDataValue = record
    private
        FDataValue: IDataValue;
        function GetDataType: IDataType; inline;
    public
        constructor Create(const ADataValue: IDataValue);

        class operator Implicit(const A: IDataValue): TDataValue; overload;
        class operator Implicit(const A: TDataValue): IDataValue; overload;

        property DataValue: IDataValue read FDataValue;
        property DataType: IDataType read GetDataType;
    end;

implementation

{ TRecordField }

constructor TRecordField.Create(const AName: string; const ADataType: IDataType);
begin
    Name := AName;
    DataType := ADataType;
end;

{ TDataType }

constructor TDataType.Create(const ADataType: IDataType);
begin
    FDataType := ADataType;
end;

function TDataType.GetName: String;
begin
    if Assigned(FDataType) then
        Result := FDataType.Name
    else
        Result := '';
end;

class operator TDataType.Implicit(const A: TDataType): IDataType;
begin
    Result := A.FDataType;
end;

class operator TDataType.Implicit(const A: IDataType): TDataType;
begin
    Result.FDataType := A;
end;

{ TDataValue }

constructor TDataValue.Create(const ADataValue: IDataValue);
begin
    FDataValue := ADataValue;
end;

function TDataValue.GetDataType: IDataType;
begin
    if Assigned(FDataValue) then
        Result := FDataValue.DataType
    else
        Result := nil;
end;

class operator TDataValue.Implicit(const A: TDataValue): IDataValue;
begin
    Result := A.FDataValue;
end;

class operator TDataValue.Implicit(const A: IDataValue): TDataValue;
begin
    Result.FDataValue := A;
end;

end.