//---------------------------------------------------------------------------

#include <vcl.h>
#pragma hdrstop

#include "common.h"
#include "Undo.h"
//---------------------------------------------------------------------------

#pragma package(smart_init)
//---------------------------------------------------------------------------
__fastcall undodata::undodata(){
  udata = CreateFile( (BaseDir+"//temp.und").c_str() , GENERIC_WRITE|GENERIC_READ , 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
  rdata = CreateFile( (BaseDir+"//temp.rnd").c_str() , GENERIC_WRITE|GENERIC_READ , 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
  uindex = new TList;
  rindex = new TList;
}
//---------------------------------------------------------------------------
__fastcall undodata::~undodata(){
  CloseHandle(udata);
  CloseHandle(rdata);
  DeleteFile((BaseDir+"//temp.und").c_str());
  DeleteFile((BaseDir+"//temp.rnd").c_str());
  while(uindex->Count){
    delete (DWORD *)uindex->Last();
    uindex->Remove(uindex->Last());
  }
  while(rindex->Count){
    delete (DWORD *)rindex->Last();
    rindex->Remove(rindex->Last());
  }
  delete uindex; uindex=NULL;
  delete rindex; rindex=NULL;
}
//---------------------------------------------------------------------------
void __fastcall undodata::reset(){
  CloseHandle(udata);
  CloseHandle(rdata);
  udata = CreateFile( (BaseDir+"//temp.und").c_str() , GENERIC_WRITE|GENERIC_READ , 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
  rdata = CreateFile( (BaseDir+"//temp.rnd").c_str() , GENERIC_WRITE|GENERIC_READ , 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);

  while(uindex->Count){
    delete (DWORD *)uindex->Last();
    uindex->Remove(uindex->Last());
  }
  while(rindex->Count){
    delete (DWORD *)rindex->Last();
    rindex->Remove(rindex->Last());
  }

}
//---------------------------------------------------------------------------
bool __fastcall undodata::canundo(){
  return uindex->Count!=0;
}
//---------------------------------------------------------------------------
bool __fastcall undodata::canredo(){
  return rindex->Count!=0;
}
//---------------------------------------------------------------------------
void __fastcall undodata::do_(TexLayer *chart){ //do_´Â actionÀü¿¡ ½ÇÇàÇÑ´Ù

  DWORD *p = new DWORD;
  *p = GetFileSize (udata, NULL);
  uindex->Add(p);
  chart->SaveToFile(udata);

  CloseHandle(rdata);
  rdata = CreateFile( (BaseDir+"//temp.rnd").c_str() , GENERIC_WRITE|GENERIC_READ , 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
  while(rindex->Count){
    delete (DWORD *)rindex->Last();
    rindex->Remove(rindex->Last());
  }

}
//---------------------------------------------------------------------------

void __fastcall undodata::undo(TexLayer *chart){
  if(canundo()){
    DWORD *pr = new DWORD;
    *pr = GetFileSize (rdata, NULL);
    rindex->Add(pr);
    chart->SaveToFile(rdata);

    DWORD *p = (DWORD *)uindex->Last();
    SetFilePointer (udata, *p, NULL, FILE_BEGIN);
    chart->ReadFromFile(udata, FILE_VERSION);
    uindex->Remove(uindex->Last());
    SetFilePointer (udata, *p, NULL, FILE_BEGIN);
    SetEndOfFile(udata);
    delete p;
  }
}
//---------------------------------------------------------------------------
void __fastcall undodata::redo(TexLayer *chart){
  if(canredo()){
    DWORD *pu = new DWORD;
    *pu = GetFileSize (udata, NULL);
    uindex->Add(pu);
    chart->SaveToFile(udata);

    DWORD *p = (DWORD *)rindex->Last();
    SetFilePointer (rdata, *p, NULL, FILE_BEGIN);
    chart->ReadFromFile(rdata, FILE_VERSION);
    rindex->Remove(rindex->Last());
    SetFilePointer (rdata, *p, NULL, FILE_BEGIN);
    SetEndOfFile(rdata);
    delete p;

  }
}
//---------------------------------------------------------------------------