#!/usr/bin/perl -w
  
  use Fcntl;
  
  # we may at some point support options.
  
  $debug = 0;  # we set it to 1 for debugging the script itself.
  
  if ($ARGV[0] eq "--debug") {
    $debug = 1;
    shift @ARGV;
  }
  
  if (@ARGV == 0) {
    print STDERR "Usage: steps/info/nnet2_dir_info.pl [--debug] <nnet3-dir1> [<nnet3-dir2> ... ]
  " .
                 "e.g: steps/info/nnet2_dir_info.pl exp/nnet3/tdnn_sp
  " .
                 "This script extracts some important information from the logs
  " .
                 "and displays it on a single (rather long) line.
  " .
                 "The --debug option is just to debug the script itself.
  " .
                 "This program exits with status 0 if it seems like the arguments
  " .
                 "really were of the expected directory type, and 1 otherwise.
  ";
    exit(1);
  }
  
  if (@ARGV > 1) {
    # repeatedly invoke this program with each of the remaining args.
    $exit_status = 0;
    if ($debug) { $debug_opt = "--debug " } else { $debug_opt = ""; }
    foreach $dir (@ARGV) {
      if (system("$0 $debug_opt$dir") != 0) {
        $exit_status = 1;
      }
    }
    exit($exit_status);
  }
  
  $nnet_dir = shift @ARGV;
  
  sub list_all_log_files {
    my @ans = ();
    my $dh;
    if (!opendir($dh, "$nnet_dir/log")) { return (); }
    @ans = readdir $dh;
    closedir $dh;
    return @ans;
  }
  
  
  # returns 1 if the diagnostics are finished on this iter, else 0.
  sub diagnostics_are_finished_on_iter {
    my $ans = 1;
    my $iter = shift @_;
    if (!open(F, "<$nnet_dir/log/compute_prob_train.$iter.log")) {
      return 0;
    }
    $found_loglike = 0;
    while (<F>) {
      if (m/Overall log-likelihood/) { $found_loglike = 1; }
    }
    if (!$found_loglike) { $ans = 0; }
    close(F);
    if (!open(F, "<$nnet_dir/log/compute_prob_valid.$iter.log")) {
      return 0;
    }
    $found_loglike = 0;
    while (<F>) {
      if (m/Overall log-likelihood/) { $found_loglike = 1; }
    }
    if (!$found_loglike) { $ans = 0; }
    close(F);
    return $ans;
  }
  
  # get the number of iterations.
  # note: the iterations go from 0 to num-iters-1.
  # if num_iters = 0 this program will just exit with status 1.
  # we may return a number slightly less than the number of iterations
  # in order to ensure that the compute_prob_train and compute_prob_valid
  # processes have finished.
  sub get_num_iters {
    my $iter = 0;
    while (defined $log_file_hash{"train.$iter.1.log"}) {
      $iter++;
    }
    if ($iter == 0) {
      die "$nnet_dir does not seem to be an nnet3 neural net training directory.";
    }
    my $last_iter = $iter - 1;
    # find an iteration where the diagnostic jobs compute_prob_{train,valid}.$last_iter.log are done.
    for (my $chosen_last_iter = $last_iter;
         $chosen_last_iter >= $last_iter - 6 && $chosen_last_iter >= 0;
         $chosen_last_iter--) {
      if (! diagnostics_are_finished_on_iter($chosen_last_iter)) {
        if ($debug) {
          print STDERR "nnet3_dir_info.pl: diagnostics not finished running on iteration $chosen_last_iter
  ";
        }
      } else {
        return $chosen_last_iter + 1;
      }
    }
    # OK, something's not right, just return the original iteration.
    return $iter;
  }
  
  sub get_num_jobs_initial {
    my $num_jobs = 1;
    while (defined $log_file_hash{"train.0.$num_jobs.log"}) {
      $num_jobs++;
    }
    $num_jobs--;
    if ($num_jobs == 0) {
      die "$nnet_dir does not seem to be an nnet3 neural net training directory.";
    }
    return $num_jobs;
  }
  
  
  sub get_num_jobs_final {  # expects $num_iters to exist as a global variable.
    my $final_iter = $num_iters - 1;
    my $num_jobs = 1;
    while (defined $log_file_hash{"train.$final_iter.$num_jobs.log"}) {
      $num_jobs++;
    }
    $num_jobs--;
    if ($num_jobs == 0) {
      die "$nnet_dir does not seem to be an nnet3 neural net training directory.";
    }
    return $num_jobs;
  }
  
  sub get_combine_info {
    # returns a string with info about the combination stage, or the empty
    # string if there wasn't one.
    if (defined $log_file_hash{"combine.log"} &&
        open(F, "<$nnet_dir/log/combine.log")) {
      while (<F>) {
        if (m/Combining nnets, objective function changed from (\S+) to (\S+)/) {
          close(F);
          return sprintf(" combine=%.2f->%.2f", $1, $2);
        }
      }
    }
    return "";
  }
  
  # this is used in get_loglike_and_accuracy to format
  # strings like ' loglike[32,48,final],train/valid=(-2.43,-2.32,-2.21/-2.84,-2.71,-2.68)'.
  sub get_printed_string {
    # $name might be 'loglike', for example.
    my ($name, $iters_array_ref, $train_hash_ref, $valid_hash_ref) = @_;
    my @iters_array = @$iters_array_ref;
    my %train_hash = %$train_hash_ref;  # hash from iter-string to value.
    my %valid_hash = %$valid_hash_ref;  # hash from iter-string to value.
    my @iters_to_print = ();
    my @train_values_to_print = ();
    my @valid_values_to_print = ();
    foreach my $iter (@iters_array) {
      if (defined($train_hash{$iter}) && defined($valid_hash{$iter})) {
        push @iters_to_print, $iter;
        push @train_values_to_print, sprintf("%.2f", $train_hash{$iter});
        push @valid_values_to_print, sprintf("%.2f", $valid_hash{$iter});
      }
    }
    if (@iters_to_print == 0) {  return ""; }
    my $joined_iters = join(",", @iters_to_print);
    my $joined_train_values = join(",", @train_values_to_print);
    my $joined_valid_values = join(",", @valid_values_to_print);
    return " ${name}:train/valid[$joined_iters]=($joined_train_values/$joined_valid_values)";
  }
  
  # invoke this as get_objf_iter($iter1, $iter2,..) where $iterN is the string-valued
  # iteration, e.g. "92", or "final", or "combined", such that we expect
  # $nnet_dir/log/compute_prob_{train,valid}.$iterN.log to exist.
  sub get_loglike_and_accuracy_info {
    my @iters_array = @_;
    my %iter_to_train_loglike = ();
    my %iter_to_valid_loglike = ();
    my %iter_to_train_accuracy = ();
    my %iter_to_valid_accuracy = ();
  
  
    foreach my $iter (@iters_array) {
      if (defined $log_file_hash{"compute_prob_train.$iter.log"} &&
          defined $log_file_hash{"compute_prob_valid.$iter.log"} &&
          open(F, "<$nnet_dir/log/compute_prob_train.$iter.log") &&
          open(G, "<$nnet_dir/log/compute_prob_valid.$iter.log")) {
        while (<F>) {
          if (m/average probability is (\S+) and accuracy is (\S+) with total weight \S+/) {
            $iter_to_train_loglike{$iter} = $1;
            $iter_to_train_accuracy{$iter} = $2;
          }
        }
        close(F);
        while (<G>) {
          if (m/average probability is (\S+) and accuracy is (\S+) with total weight \S+/) {
            $iter_to_valid_loglike{$iter} = $1;
            $iter_to_valid_accuracy{$iter} = $2;
          }
        }
        close(G);
      }
    }
    $ans = "";
    $ans .= get_printed_string("loglike", \@iters_array, \%iter_to_train_loglike,
                               \%iter_to_valid_loglike);
    $ans .= get_printed_string("accuracy", \@iters_array, \%iter_to_train_accuracy,
                               \%iter_to_valid_accuracy);
    return $ans;
  }
  
  # invoke this as get_progress_info($iter), e.g. set $iter to the last
  # iteration number.
  sub get_progress_info {
    my $iter = shift @_;
    if (!defined $log_file_hash{"progress.$iter.log"} ||
        !open(F, "<$nnet_dir/log/progress.$iter.log")) {
      return "";
    }
    my $num_parameters = "0";
    my $output_dim = 0;
    my $input_dim = 0;
    while (<F>) {
      if (m/^parameter-dim (\S+)/) {
        $num_parameters = sprintf("%.1fM", $1 / 1000000.0);
      }
      if (m/^input-dim (\S+)/) {
        $input_dim = $1;
      }
      if (m/^output-dim (\S+)/) {
        $output_dim = $1;
      }
    }
    close(F);
    $ans = "";
    if ($num_parameters ne "0") {  $ans .= " num-params=$num_parameters"; }
    if ($output_dim > 0 && $input_dim > 0) {
      $ans .= " dim=$input_dim->$output_dim";
    } elsif ($output_dim > 0) {
      $ans .= " output-dim=$output_dim";
    }
    return $ans;
  }
  
  # return 1 if we seem to have finished training, else 0.
  sub finished_training {
    return defined $log_file_hash{"compute_prob_train.final.log"} ||
      defined $log_file_hash{"compute_prob_train.combined.log"};
  }
  
  @log_files = list_all_log_files();
  if (@log_files == 0) {  exit(1); }
  $log_file_hash = ();
  foreach $f (@log_files) { $log_file_hash{$f} = 1; }
  
  $num_iters = get_num_iters();
  $num_jobs_initial = get_num_jobs_initial();
  $num_jobs_final = get_num_jobs_final();
  $last_iter = $num_iters - 1;
  $two_thirds_iter = int($last_iter * 0.666);
  
  $output_string = "$nnet_dir: num-iters=$num_iters";
  
  $output_string .= " nj=$num_jobs_initial..$num_jobs_final";
  
  $output_string .= get_progress_info("$last_iter");
  
  $output_string .= get_combine_info();
  
  
  
  # note: IIRC some of the scripts use the name 'combined' for the model after
  # combination, and some 'final', so we try both; only one of these will
  # actually produce any output.
  
  
  @iters_array = ("$two_thirds_iter", "$last_iter", "final", "combined");
  
  $output_string .= get_loglike_and_accuracy_info(@iters_array);
  
  print "$output_string
  ";
  
  exit(0);