{
  test_batch.pas - concurrent packet batch toss.

  Generates K synthetic packets with M messages each, runs them
  through a TPacketBatch with N worker threads writing into a
  shared destination JAM base, then verifies the destination
  holds K*M messages (no drops, no duplicates, no corruption).
}

program test_batch;

{$mode objfpc}{$H+}

uses
  {$IFDEF UNIX}cthreads,{$ENDIF}
  SysUtils, Classes, SyncObjs,
  testutil,
  ma.types, ma.events, ma.api, ma.batch,
  ma.fmt.jam, ma.fmt.jam.uni,
  ma.fmt.pkt, ma.fmt.pkt.uni;

const
  SCRATCH  = '/tmp/ma_batch';
  INBOUND  = SCRATCH + '/inbound';
  DESTBASE = SCRATCH + '/echo';
  PACKETS  = 5;
  PER_PKT  = 10;
  THREADS  = 3;

type
  TBatchRunner = class
    DestPath: AnsiString;
    Batch:    TPacketBatch;
    Written:  longint;
    CS:       TRTLCriticalSection;
    procedure OnMessage(const APacketPath: AnsiString;
                        var Msg: TUniMessage;
                        var Stop: boolean);
  end;

procedure TBatchRunner.OnMessage(const APacketPath: AnsiString;
                                 var Msg: TUniMessage;
                                 var Stop: boolean);
var
  base: TMessageBase;
begin
  base := Batch.GetOrCreateBase(mbfJam, DestPath);
  if base = nil then exit;
  if base.WriteMessage(Msg) then begin
    EnterCriticalSection(CS);
    Inc(Written);
    LeaveCriticalSection(CS);
  end;
end;

procedure GeneratePackets;
var
  i, j: integer;
  pkt:  TPktFile;
  hdr:  TPktHeaderInfo;
  msg:  TPktMessage;
  fname: string;
begin
  ForceDirectories(INBOUND);
  for i := 1 to PACKETS do begin
    fname := Format('%s/pkt%2.2d.pkt', [INBOUND, i]);
    if FileExists(fname) then DeleteFile(fname);
    hdr := TPktFile.BuildHeaderInfo(1, 1, 1, 0,
                                    1, 1, 2, 0,
                                    '');
    pkt := TPktFile.CreateNew(fname, hdr);
    try
      for j := 1 to PER_PKT do begin
        FillChar(msg, SizeOf(msg), 0);
        msg.OrigNode := 1;  msg.OrigNet := 1;
        msg.DestNode := 2;  msg.DestNet := 1;
        msg.Attr     := 0;
        msg.Cost     := 0;
        msg.DateTime := '01 Apr 26  12:00:00';
        msg.WhoTo    := 'All';
        msg.WhoFrom  := Format('pkt%d', [i]);
        msg.Subject  := Format('pkt=%d msg=%d', [i, j]);
        msg.Body     := Format('AREA:TEST'#13'body %d/%d', [i, j]) + #13;
        pkt.WriteMessage(msg);
      end;
      pkt.WriteTerminator;
    finally
      pkt.Free;
    end;
  end;
end;

procedure RunBatch;
var
  runner: TBatchRunner;
  processed: longint;
  base: TMessageBase;
begin
  TestBegin(Format('Batch toss: %d pkts * %d msgs, %d threads',
                   [PACKETS, PER_PKT, THREADS]));

  { Fresh scratch }
  ForceDirectories(SCRATCH);
  if FileExists(DESTBASE + '.jhr') then DeleteFile(DESTBASE + '.jhr');
  if FileExists(DESTBASE + '.jdt') then DeleteFile(DESTBASE + '.jdt');
  if FileExists(DESTBASE + '.jdx') then DeleteFile(DESTBASE + '.jdx');
  if FileExists(DESTBASE + '.jlr') then DeleteFile(DESTBASE + '.jlr');

  { Pre-create an empty JAM base so GetOrCreateBase(momReadWrite)
    has files to open. }
  base := MessageBaseOpen(mbfJam, DESTBASE, momCreate);
  try
    AssertTrue('Pre-create dest base', base.Open);
  finally
    base.Close;
    base.Free;
  end;

  GeneratePackets;

  runner := TBatchRunner.Create;
  InitCriticalSection(runner.CS);
  runner.DestPath := DESTBASE;
  runner.Written  := 0;
  runner.Batch := TPacketBatch.Create(INBOUND, THREADS);
  runner.Batch.Processor := @runner.OnMessage;

  processed := runner.Batch.Run;

  AssertEquals('Packets processed', PACKETS, processed);
  AssertEquals('Messages written',  PACKETS * PER_PKT, runner.Written);

  runner.Batch.Free;
  DoneCriticalSection(runner.CS);
  runner.Free;

  { Reopen dest base; verify count matches what we claim we wrote. }
  base := MessageBaseOpen(mbfJam, DESTBASE, momReadOnly);
  try
    AssertTrue('Open dest (read)', base.Open);
    AssertEquals('Dest message count',
                 PACKETS * PER_PKT, base.MessageCount);
  finally
    base.Close;
    base.Free;
  end;

  TestOK;
end;

begin
  WriteLn('fpc-msgbase: concurrent batch test');
  WriteLn;
  RunBatch;
  Halt(TestsSummary);
end.