program generator;

{$mode objfpc}{$H+}

uses
  {$IFDEF UNIX}{$IFDEF UseCThreads}
  cthreads,
  {$ENDIF}{$ENDIF}
  Classes, SysUtils,
  HeaderGenerator
  , Vulkan
  ;

var
  InputFile: String;
  OutputFile: String;
  TemplateFile: String;

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure ParseArg(var i: Integer);
var
  s: String;
begin
  s := ParamStr(i);
  if (s = '-i') or (s = '--input') then begin
    inc(i);
    if (i > ParamCount) then
      raise Exception.Create('invalid argument count');
    InputFile := ExpandFileName(ParamStr(i));

  end else if (s = '-o') or (s = '--output') then begin
    inc(i);
    if (i > ParamCount) then
      raise Exception.Create('invalid argument count');
    OutputFile := ExpandFileName(ParamStr(i));

  end else if (s = '-t') or (s = '--template') then begin
    inc(i);
    if (i > ParamCount) then
      raise Exception.Create('invalid argument count');
    TemplateFile := ExpandFileName(ParamStr(i));

  end else
    raise Exception.Create('invalid argument: ' + s);
end;

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure ParseArgs;
var
  i: Integer;
begin
  i := 1;
  while i <= ParamCount do begin
    ParseArg(i);
    inc(i);
  end;
end;

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure GenerateHeader;
var
  gen: THeaderGenerator;
begin
  WriteLn('Generating Vulkan Header for PFC', InputFile);
  WriteLn('  InputFile:    ', InputFile);
  WriteLn('  OutputFile:   ', OutputFile);
  WriteLn('  TemplateFile: ', TemplateFile);

  gen := THeaderGenerator.Create;
  try
    gen.ReadFile(InputFile);
    gen.GenerateCode('vulkan', TemplateFile, OutputFile);
  finally
    FreeAndNil(gen);
  end;
end;

begin
  try
    InputFile    := ExtractFilePath(ParamStr(0)) + 'vk.xml';
    OutputFile   := ExtractFilePath(ParamStr(0)) + 'Vulkan.pas';
    TemplateFile := ExtractFilePath(ParamStr(0)) + 'Vulkan.tpl';
    ParseArgs;
    GenerateHeader;
  except
    on ex: Exception do begin
      WriteLn('Error: ' + ex.Message);
    end;
  end;

  WriteLn('finished!');
  ReadLn; // DEBUG!!!
end.