/*
   Copyright (C) 2003 Commonwealth Scientific and Industrial Research
   Organisation (CSIRO) Australia

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
   are met:

   - Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.

   - Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.

   - Neither the name of CSIRO Australia nor the names of its
   contributors may be used to endorse or promote products derived from
   this software without specific prior written permission.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
   PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE ORGANISATION OR
   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>

#include <getopt.h>
#include <errno.h>

#ifdef HAVE_INTTYPES_H
#  include <inttypes.h>
#else
#  define PRId64 "I64d"
#endif

#include "oggz/oggz.h"
#include "oggz_tools.h"

#define READ_SIZE 4096

#define ALL_VORBIS_WARNING \
  "oggz-merge: WARNING: Merging Ogg Vorbis I files. The resulting file will\n" \
  "  contain %d tracks in parallel, interleaved for simultaneous playback.\n"\
  "  If you want to sequence these files one after another, use cat instead.\n"

static char * progname;

static void
usage (char * progname)
{
  printf ("Usage: %s [options] filename ...\n", progname);
  printf ("Merge Ogg files together, interleaving pages in order of presentation time.\n");
  printf ("\nMiscellaneous options\n");
  printf ("  -o filename, --output filename\n");
  printf ("                         Specify output filename\n");
  printf ("  -h, --help             Display this help and exit\n");
  printf ("  -v, --version          Output version information and exit\n");
  printf ("  -V, --verbose          Verbose operation\n");
  printf ("\n");
  printf ("Please report bugs to <ogg-dev@xiph.org>\n");
}

static void
exit_out_of_memory (void)
{
  fprintf (stderr, "%s: Out of memory\n", progname);
  exit (1);
}

static void
checked_fwrite (const void *data, size_t size, size_t count, FILE *stream)
{
  int n = fwrite (data, size, count, stream);
  if ((size_t)n != count) {
    perror ("write failed");
    exit (1);
  }
}

typedef struct _OMData OMData;
typedef struct _OMInput OMInput;
typedef struct _OMITrack OMITrack;

struct _OMData {
  OggzTable * inputs;
  int verbose;
};

struct _OMInput {
  OMData * omdata;
  OGGZ * reader;
  const ogg_page * og;
};

struct _OMITrack {
  long output_serialno;
};

static ogg_page *
_ogg_page_copy (const ogg_page * og)
{
  ogg_page * new_og;

  new_og = malloc (sizeof (*og));
  if (new_og == NULL) return NULL;

  new_og->header = malloc (og->header_len);
  if (new_og->header == NULL) {
    free (new_og);
    return NULL;
  }
  new_og->header_len = og->header_len;
  memcpy (new_og->header, og->header, og->header_len);

  new_og->body = malloc (og->body_len);
  if (new_og->body == NULL) {
    free (new_og->header);
    free (new_og);
    return NULL;
  }
  new_og->body_len = og->body_len;
  memcpy (new_og->body, og->body, og->body_len);

  return new_og;
}

static int
_ogg_page_free (const ogg_page * og)
{
  free (og->header);
  free (og->body);
  free ((ogg_page *)og);
  return 0;
}

static void
ominput_delete (OMInput * input)
{
  oggz_close (input->reader);

  free (input);
}

static OMData *
omdata_new (void)
{
  OMData * omdata;

  omdata = (OMData *) malloc (sizeof (OMData));
  if (omdata == NULL) return NULL;

  omdata->inputs = oggz_table_new ();
  omdata->verbose = 0;

  return omdata;
}

static void
omdata_delete (OMData * omdata)
{
  OMInput * input;
  int i, ninputs;

  ninputs = oggz_table_size (omdata->inputs);
  for (i = 0; i < ninputs; i++) {
    input = (OMInput *) oggz_table_nth (omdata->inputs, i, NULL);
    ominput_delete (input);
  }
  oggz_table_delete (omdata->inputs);

  free (omdata);
}

static int
read_page (OGGZ * oggz, const ogg_page * og, long serialno, void * user_data)
{
  OMInput * input = (OMInput *) user_data;

  input->og = _ogg_page_copy (og);
  if (input->og == NULL) return OGGZ_STOP_ERR;

  return OGGZ_STOP_OK;
}

static int
omdata_add_input (OMData * omdata, FILE * infile)
{
  OMInput * input;
  int nfiles;

  input = (OMInput *) malloc (sizeof (OMInput));
  if (input == NULL) return -1;

  input->omdata = omdata;
  input->reader = oggz_open_stdio (infile, OGGZ_READ|OGGZ_AUTO);
  input->og = NULL;

  oggz_set_read_page (input->reader, -1, read_page, input);

  nfiles = oggz_table_size (omdata->inputs);
  if (!oggz_table_insert (omdata->inputs, nfiles++, input)) {
    ominput_delete (input);
    return -1;
  }

  return 0;
}

static int
oggz_merge (OMData * omdata, FILE * outfile)
{
  OMInput * input;
  int ninputs, i, min_i;
  long key, n;
  ogg_int64_t units, min_units;
  const ogg_page * og;
  int active;

  /* For theora+vorbis, or dirac+vorbis, ensure video bos is first */
  int careful_for_video = 0;

  /* If all input files are Ogg Vorbis I, warn that the output will not be
   * a valid Ogg Vorbis I file as it will be multitrack. This is in response
   * to Debian bug 280550: http://bugs.debian.org/280550
   */
  int v, warn_all_vorbis = 1;

  if (oggz_table_size (omdata->inputs) == 2)
    careful_for_video = 1;

  while ((ninputs = oggz_table_size (omdata->inputs)) > 0) {
    min_units = -1;
    min_i = -1;
    active = 1;

    if (omdata->verbose)
      printf ("------------------------------------------------------------\n");

    /* Reload all pages, and find the min (earliest) */
    for (i = 0; active && i < oggz_table_size (omdata->inputs); i++) {
      input = (OMInput *) oggz_table_nth (omdata->inputs, i, &key);
      if (input != NULL) {
	while (input && input->og == NULL) {
	  n = oggz_read (input->reader, READ_SIZE);
	  if (n == 0) {
	    oggz_table_remove (omdata->inputs, key);
	    ominput_delete (input);
	    input = NULL;
	  } else if (n == OGGZ_ERR_STOP_ERR) {
            exit_out_of_memory();
          }
	}
	if (input && input->og) {
	  if (ogg_page_bos ((ogg_page *)input->og)) {
	    min_i = i;

	    if (careful_for_video || warn_all_vorbis) {
              int is_vorbis;
              long serialno = ogg_page_serialno ((ogg_page *)input->og);

              is_vorbis = (oggz_stream_get_content (input->reader, serialno) == OGGZ_CONTENT_VORBIS);

	      if (i == 0 && is_vorbis)
		careful_for_video = 0;
	      else
		active = 0;

              if (!is_vorbis) warn_all_vorbis = 0;

	    } else {
	      active = 0;
	    }
	  } else if (warn_all_vorbis) {
            int all_inputs_are_beyond_bos = 1;

            /* All BOS pages seen so far are Ogg Vorbis. The following loop
             * checks if all input files are single-track, ie. Ogg Vorbis I.
             * We can only rely on this information if all inputs are beyond
             * bos, ie. all BOS pages have been seen. */
            for (v = 0; v < oggz_table_size (omdata->inputs); v++) {
              OMInput * input_v;
              OGGZ * oggz;

              input_v = (OMInput *) oggz_table_nth (omdata->inputs, i, &key);
              oggz = input_v->reader;

              if (oggz_get_bos(oggz, -1)) all_inputs_are_beyond_bos = 0;
              else if (oggz_get_numtracks(oggz) > 1) warn_all_vorbis = 0;
            }

            if (all_inputs_are_beyond_bos && warn_all_vorbis) {
              fprintf (stderr, ALL_VORBIS_WARNING, v);
              warn_all_vorbis = 0;
            }
          }
	  units = oggz_tell_units (input->reader);

	  if (omdata->verbose) {
	    ot_fprint_time (stdout, (double)units/1000);
	    printf (": Got index %d serialno %010u %" PRId64 " units: ",
		    i, ogg_page_serialno ((ogg_page *)input->og), units);
	  }

	  if (min_units == -1 || units == 0 ||
	      (units > -1 && units < min_units)) {
	    min_units = units;
	    min_i = i;
	    if (omdata->verbose)
	      printf ("Min\n");
	  } else {
	    if (omdata->verbose)
	      printf ("Moo\n");
	  }
	} else if (omdata->verbose) {
	  if (input == NULL) {
	    printf ("*** index %d NULL\n", i);
	  } else {
	    printf ("*** No page from index %d\n", i);
	  }
	}
      }
    }

    if (omdata->verbose)
      printf ("Min index %d\n", min_i);

    /* Write the earliest page */
    if (min_i != -1) {
      input = (OMInput *) oggz_table_nth (omdata->inputs, min_i, &key);
      og = input->og;
      checked_fwrite (og->header, 1, og->header_len, outfile);
      checked_fwrite (og->body, 1, og->body_len, outfile);

      _ogg_page_free (og);
      input->og = NULL;
    }
  }

  return 0;
}

int
main (int argc, char * argv[])
{
  int show_version = 0;
  int show_help = 0;

  char * infilename = NULL, * outfilename = NULL;
  FILE * infile = NULL, * outfile = NULL;
  int used_stdin = 0; /* Flag usage of stdin, only use it once */
  OMData * omdata;
  int i;

  char * optstring = "hvVo:";

#ifdef HAVE_GETOPT_LONG
  static struct option long_options[] = {
    {"help", no_argument, 0, 'h'},
    {"version", no_argument, 0, 'v'},
    {"verbose", no_argument, 0, 'V'},
    {"output", required_argument, 0, 'o'},
    {0,0,0,0}
  };
#endif

  ot_init ();

  progname = argv[0];

  if (argc < 2) {
    usage (progname);
    return (1);
  }

  if (!strncmp (argv[1], "-?", 2)) {
#ifdef HAVE_GETOPT_LONG
    ot_print_options (long_options, optstring);
#else
    ot_print_short_options (optstring);
#endif
    exit (0);
  }

  omdata = omdata_new();
  if (omdata == NULL)
    exit_out_of_memory();

  while (1) {
#ifdef HAVE_GETOPT_LONG
    i = getopt_long (argc, argv, optstring, long_options, NULL);
#else
    i = getopt (argc, argv, optstring);
#endif
    if (i == -1) break;
    if (i == ':') {
      usage (progname);
      goto exit_err;
    }

    switch (i) {
    case 'h': /* help */
      show_help = 1;
      break;
    case 'v': /* version */
      show_version = 1;
      break;
    case 'o': /* output */
      outfilename = optarg;
      break;
    case 'V': /* verbose */
      omdata->verbose = 1;
    default:
      break;
    }
  }

  if (show_version) {
    printf ("%s version " VERSION "\n", progname);
  }

  if (show_help) {
    usage (progname);
  }

  if (show_version || show_help) {
    goto exit_ok;
  }

  if (optind >= argc) {
    usage (progname);
    goto exit_err;
  }

  if (optind >= argc) {
    usage (progname);
    goto exit_err;
  }

  while (optind < argc) {
    infilename = argv[optind++];
    if (strcmp (infilename, "-") == 0) {
      if (used_stdin) continue;

      infile = stdin;
      used_stdin = 1;
    } else {
      infile = fopen (infilename, "rb");
    }

    if (infile == NULL) {
      fprintf (stderr, "%s: unable to open input file %s\n", progname,
	       infilename);
    } else {
      if (omdata_add_input (omdata, infile) < 0)
        exit_out_of_memory();
    }
  }

  if (outfilename == NULL) {
    outfile = stdout;
  } else {
    outfile = fopen (outfilename, "wb");
    if (outfile == NULL) {
      fprintf (stderr, "%s: unable to open output file %s\n",
	       progname, outfilename);
      goto exit_err;
    }
  }

  oggz_merge (omdata, outfile);

 exit_ok:
  omdata_delete (omdata);
  exit (0);

 exit_err:
  omdata_delete (omdata);
  exit (1);
}