MODULE AutoMix;    (* Random changes *)

(*  IMPORT PMD;*)
  FROM SYSTEM IMPORT BYTE;
  IMPORT InitCompilerMods;
  IMPORT Locks;
  FROM DBIndxes IMPORT   DBIndex, InitIndex, CloseIndex, FindPositionCh,
       AddToUpdateList;
  FROM DBFields IMPORT  Replace;
  FROM ModBase3 IMPORT DBFile,InitDBF,OpenDBF,ReadDBRec,WriteDBRec,
    NumberRecords,LockRec,UnLockRec,DefaultFixUp;
  FROM ErrorManager IMPORT WARN;
  FROM Timing IMPORT     BeginTimer, ShowUsage;

  FROM Rand IMPORT    RandomInit, RandomCard,Randomize;
 (* FROM Lib IMPORT RANDOM;*)
  IMPORT StringIO;
  IMPORT StrConv,FAPI;
  VAR
  counter:CARDINAL;
  string:ARRAY[0..79] OF CHAR;

  PROCEDURE KeyPressed():BOOLEAN;
  VAR r:CARDINAL;
  k:FAPI.KBDKEYINFO;
  BEGIN
    k.chChar:=0C;
    k.chScan:=0;
    k.bNlsShift:=0;
    r :=FAPI.KBDPEEK(ADR(k),0);
    RETURN (k.chScan#BYTE(0)) OR (k.chChar#BYTE(0));
  END KeyPressed;

  PROCEDURE RandStr(VAR S : ARRAY OF CHAR);
  (* Generate a string of random letters with a random length *)
    VAR
        I   : CARDINAL;
        Len : CARDINAL;
  BEGIN
    Len := 1 + (*RandomCard*)RandomCard(HIGH(S)+1) ;  (* random 1 to 30 Len *)
    FOR I := 0 TO Len - 1 DO
      S[I] := CHR((*RandomCard*)RandomCard(26)+65);  (* random letters *)
    END (* for *);
    FOR I := Len TO HIGH(S) DO        (* ModBase requires space padded keys *)
      S[I] := ' ';                    (* instead of a 0C terminated string  *)
    END (* if *);
  END RandStr;

  CONST
      KeyLen  = 30;
      Buffers = 400;

  TYPE
      KeyStr = ARRAY [0..KeyLen-1] OF CHAR;

  VAR
      DBF   : DBFile;
      NDX   : DBIndex;
      Name  : KeyStr;
      Found : BOOLEAN;
      rec:LONGINT;
      res:CARDINAL;
BEGIN
  Randomize;
  res:=FAPI.KBDFLUSHBUFFER(0);
  counter:=0;
  InitDBF('Modbase.DBF',DBF,0,FALSE,FALSE,TRUE,DefaultFixUp);
  IF OpenDBF(DBF) THEN END;
  InitIndex("ModBase.NDX", NDX,DBF, Buffers,FALSE,TRUE,FALSE);
  AddToUpdateList(DBF,NDX);
  REPEAT
   (* rec:=VAL(LONGINT,RandomCard(VAL(CARDINAL,NumberRecords(DBF)))+1);*)
    rec:=VAL(LONGINT,RandomCard(10)+1);(*increace odds of contention*)
    RandStr(Name);
    ReadDBRec(DBF,rec);
    Locks.Pause(200);(* give chance to others to change *)
    Replace(DBF,1,Name);
    WriteDBRec(DBF);
    StrConv.CardinalToStr(counter,8,string);
    StringIO.WriteStr(StringIO.outp,string);
    INC(counter);
  UNTIL (counter=65000) OR KeyPressed();             (* until not in index *)
  CloseIndex(NDX);
  DEC(counter);
  res:=FAPI.KBDFLUSHBUFFER(0);
END AutoMix.