// bin/ali-to-pdf.cc

// Copyright 2009-2011  Microsoft Corporation

// See ../../COPYING for clarification regarding multiple authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//  http://www.apache.org/licenses/LICENSE-2.0
//
// THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
// WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
// MERCHANTABLITY OR NON-INFRINGEMENT.
// See the Apache 2 License for the specific language governing permissions and
// limitations under the License.

/** @brief Converts alignments (containing transition-ids) to pdf-ids, zero-based.
*/
#include "base/kaldi-common.h"
#include "gmm/am-diag-gmm.h"
#include "hmm/transition-model.h"
#include "hmm/hmm-utils.h"
#include "util/common-utils.h"
#include "fst/fstlib.h"

int main(int argc, char *argv[]) {
  using namespace kaldi;
  typedef kaldi::int32 int32;
  try {
    const char *usage =
        "Converts alignments (containing transition-ids) to pdf-ids, zero-based.\n"
        "Usage:  ali-to-pdf  [options] <model> <alignments-rspecifier> <pdfs-wspecifier>\n"
        "e.g.: \n"
        " ali-to-pdf 1.mdl ark:1.ali ark, t:-\n";
    ParseOptions po(usage);

    po.Read(argc, argv);

    if (po.NumArgs() != 3) {
      po.PrintUsage();
      exit(1);
    }

    std::string model_filename = po.GetArg(1),
        alignments_rspecifier = po.GetArg(2),
        pdfs_wspecifier = po.GetArg(3);

    TransitionModel trans_model;
    ReadKaldiObject(model_filename, &trans_model);

    SequentialInt32VectorReader reader(alignments_rspecifier);

    Int32VectorWriter writer(pdfs_wspecifier);
    int32 num_done = 0;
    for (; !reader.Done(); reader.Next()) {
      std::string key = reader.Key();
      std::vector<int32> alignment = reader.Value();

      for (size_t i = 0; i < alignment.size(); i++)
        alignment[i] = trans_model.TransitionIdToPdf(alignment[i]);

      writer.Write(key, alignment);
      num_done++;
    }
    KALDI_LOG << "Converted " << num_done << " alignments to pdf sequences.";
  } catch(const std::exception &e) {
    std::cerr << e.what();
    return -1;
  }
}