unit ATBWebInterface;

{$mode ObjFPC}{$H+}

interface

uses SysUtils, CTypes, fpjson, jsonparser, ATBUtils;

type
  PTJSONObject = ^TJSONObject;

//
// public interface
//

function GetFileMenu(const localRepository: UTF8String;
                     jObj: PTJSONObject): Boolean;

function GetFile(const localRepository: UTF8String;
                 const fileId: UTF8String;
                 jObj: PTJSONObject): Boolean;

function SetFile(const localRepository: UTF8String;
                 const fileId: UTF8String;
                 const jsonData: TJSONData): Boolean;

function GetFileName(const localRepository: UTF8String;
                     const fileId: UTF8String): UTF8String;

// private c-interface
function GetFileMenuInternal(const localRepository: PChar): PChar; stdcall;
function GetFileInternal(const localRepository: PChar; const fileId: PChar): PChar; stdcall;
function SetFileInternal(const localRepository: PChar; const fileId: PChar;
                         const json: PChar; size: cint32): cbool; stdcall;
function GetFileNameInternal(const localRepository: PChar;
                             const fileId: PChar): PChar; stdcall;


implementation
    const DLLName = 'CalculatorCInterface.dll';

    ///
    function GetFileMenu(const localRepository: UTF8String; jObj: PTJSONObject): Boolean;
    var
        p: PChar;
        fileMenuContent: UTF8String;
    begin
        Result := false;
        try
            p := GetFileMenuInternal(PChar(Utf8ToAnsi(localRepository)));
            if p <> nil then begin
                fileMenuContent := UTF8String(p);
                jObj^ := GetJSON(fileMenuContent) as TJSONObject;
                Result := true;
            end;
        finally
            DeleteMem(p);
        end;
    end;

    function GetFileName(const localRepository: UTF8String;
                     const fileId: UTF8String): UTF8String;
    var
        p: PChar;
    begin
        Result := '';
        try
            p := GetFileNameInternal(PChar(Utf8ToAnsi(localRepository)),
                                     PChar(Utf8ToAnsi(fileId)));
            if p <> nil then begin
                Result := UTF8String(p);
            end;
        finally
            DeleteMem(p);
        end;
    end;

    function GetFile(const localRepository: UTF8String; const fileId: UTF8String;
                     jObj: PTJSONObject): Boolean;
    var
        p: PChar;
        fileContent: UTF8String;
    begin
        Result := false;
                try
            p := GetFileInternal(PChar(Utf8ToAnsi(localRepository)),
                                 PChar(Utf8ToAnsi(fileId)));
            if p <> nil then begin
                fileContent := UTF8String(p);
                jObj^ := GetJSON(fileContent) as TJSONObject;
                Result := true;
            end;
        finally
            DeleteMem(p);
        end;
    end;

    ///
    function SetFile(const localRepository: UTF8String; const fileId: UTF8String;
                     const jsonData: TJSONData): Boolean;
    var
        P: PChar;
        Len: Integer;
        S: UTF8String;
    begin
        try
            writeLn(jsonData.FormatJSON);
            S := jsonData.AsJSON;
            P := PChar(S);
            Len := System.Length(Utf8ToAnsi(P));
            Result := SetFileInternal(PChar(Utf8ToAnsi(localRepository)),
                                      PChar(Utf8ToAnsi(fileId)), P, Len);
        finally
        end;
    end;

    //
    // external c-interface
    //

    function GetFileInternal(const localRepository: PChar;
                             const fileId: PChar): PChar; stdcall;
        external DLLName;

    function GetFileNameInternal(const localRepository: PChar;
                                 const fileId: PChar): PChar; stdcall;
        external DLLName;

    function GetFileMenuInternal(const localRepository: PChar): PChar; stdcall;
        external DLLName;

    function SetFileInternal(const localRepository: PChar;
                             const fileId: PChar;
                             const json: PChar;
                             size: cint32): cbool; stdcall;
        external DLLName;

end.