/*
  Copyright (c) 2007            Stefan Kurtz <kurtz@zbh.uni-hamburg.de>
  Copyright (c) 2007-2008, 2013 Gordon Gremme <gordon@gremme.org>
  Copyright (c) 2010-2011       Giorgio Gonnella <gonnella@zbh.uni-hamburg.de>
  Copyright (c) 2007-2011       Center for Bioinformatics, University of Hamburg

  Permission to use, copy, modify, and distribute this software for any
  purpose with or without fee is hereby granted, provided that the above
  copyright notice and this permission notice appear in all copies.

  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#include <limits.h>
#include <string.h>
#include <sys/types.h>

#include "core/compat.h"
#include "core/fileutils_api.h"
#include "core/xposix.h"
#include "core/fa.h"
#include "core/ma.h"
#include "core/versionfunc.h"
#include "core/seq_iterator_sequence_buffer_api.h"
#include "core/seq_iterator_fastq_api.h"
#include "core/unused_api.h"
#include "core/versionfunc.h"
#include "core/xansi_api.h"
#include "core/progressbar.h"
#include "core/format64.h"
#include "core/unused_api.h"
#include "core/types_api.h"
#include "core/disc_distri_api.h"
#include "core/option_api.h"
#include "core/error_api.h"
#include "core/logger.h"
#include "extended/assembly_stats_calculator.h"
#include "tools/gt_seqstat.h"

#define GT_SEQSTAT_BINARY_DISTLEN_SUFFIX ".distlen"

typedef struct
{
  bool verbose,
       dodistlen,
       binarydistlen,
       doastretch,
       docstats,
       showestimsize;
  unsigned int bucketsize;
  GtUword genome_length;
} SeqstatArguments;

static void* gt_seqstat_arguments_new(void)
{
  return gt_calloc((size_t) 1, sizeof (SeqstatArguments));
}

static void gt_seqstat_arguments_delete(void *tool_arguments)
{
  SeqstatArguments *arguments = tool_arguments;
  if (!arguments) return;
  gt_free(arguments);
}

static GtOptionParser* gt_seqstat_option_parser_new(void *tool_arguments)
{
  SeqstatArguments *arguments = tool_arguments;
  GtOptionParser *op;
  GtOption *optionverbose, *optiondistlen, *optionbucketsize,
           *optioncontigs, *optionastretch, *optionestimsize,
           *optionbinarydistlen, *optiongenome;

  gt_assert(arguments);

  op = gt_option_parser_new("[options] file [...]",
                            "Calculate statistics for fasta file(s).");

  optionverbose = gt_option_new_bool("v","be verbose",
                                  &arguments->verbose,false);
  gt_option_parser_add_option(op, optionverbose);

  optiondistlen = gt_option_new_bool("distlen",
                                  "show distribution of sequence length",
                                  &arguments->dodistlen,false);
  gt_option_parser_add_option(op, optiondistlen);

  optionbucketsize = gt_option_new_uint_min("b",
                                "bucket size for distlen option",
                                &arguments->bucketsize, 100U, 1U);
  gt_option_imply(optionbucketsize, optiondistlen);
  gt_option_parser_add_option(op, optionbucketsize);

  optionbinarydistlen = gt_option_new_bool("binary",
                                  "use a binary format for distlen output\n"
                                  "output filename: <first_input_filename>"
                                  GT_SEQSTAT_BINARY_DISTLEN_SUFFIX "\n"
                                  "bucketsize: 1",
                                  &arguments->binarydistlen,false);
  gt_option_imply(optionbinarydistlen, optiondistlen);
  gt_option_exclude(optionbinarydistlen, optionbucketsize);
  gt_option_parser_add_option(op, optionbinarydistlen);

  optioncontigs = gt_option_new_bool("contigs",
                                   "summary of contigs set statistics",
                                   &arguments->docstats,true);
  gt_option_parser_add_option(op, optioncontigs);

  optionastretch = gt_option_new_bool("astretch",
                                   "show distribution of A-substrings",
                                   &arguments->doastretch,false);
  gt_option_exclude(optiondistlen, optionastretch);
  gt_option_parser_add_option(op, optionastretch);
  gt_option_is_extended_option(optionastretch);

  optionestimsize = gt_option_new_bool("estimsize",
                                   "show estimated size",
                                   &arguments->showestimsize,false);
  gt_option_parser_add_option(op, optionestimsize);
  gt_option_is_development_option(optionestimsize);

  optiongenome = gt_option_new_uword_min("genome",
                                "set genome length for NG50/NG80 calculation",
                                &arguments->genome_length, 0, 1UL);
  gt_option_imply(optiongenome, optioncontigs);
  gt_option_parser_add_option(op, optiongenome);

  gt_option_parser_set_min_args(op, 1U);
  return op;
}

static void showdistseqlen(GtUword key, GtUint64 value,
                            void *data)
{
  GtUword distvalue;
  unsigned int *bucketsize = data;

  gt_assert(value <= (GtUint64) ULONG_MAX);
  distvalue = (GtUword) value;
  printf(""GT_WU"--"GT_WU" "GT_WU"\n",
         (*bucketsize) * key,
         (*bucketsize) * (key+1) - 1,
         distvalue);
}

static void showdistseqlenbinary(GtUword key, GtUint64 value,
                            void *data)
{
  GtUword value_ul;
  /*@ignore@*/
  FILE *file = data;
  /*@end@*/

  gt_assert(value <= (GtUint64) ULONG_MAX);
  value_ul = (GtUword) value;
  gt_xfwrite(&key, sizeof (key), (size_t)1, file);
  gt_xfwrite(&value_ul, sizeof (value_ul), (size_t)1, file);
}

typedef struct
{
  GtUint64 sumA, *mmercount;
  GtUword maxvalue, minkey;
} Astretchinfo;

static void showastretches(GtUword key, GtUint64 value,
                           void *data)
{
  Astretchinfo *astretchinfo = (Astretchinfo *) data;

  astretchinfo->sumA += value * (GtUint64) key;
  if (key > astretchinfo->maxvalue)
  {
    astretchinfo->maxvalue = key;
  }
  /*@ignore@*/
  printf(""GT_WU" "GT_LLU"\n", key,value);
  /*@end@*/
}

static void showmeroccurrence(GtUword key, GtUint64 value,
                              void *data)
{
  GtUword len;
  Astretchinfo *astretchinfo = (Astretchinfo *) data;

  for (len=astretchinfo->minkey; len<= key; len++)
  {
    gt_assert(len <= astretchinfo->maxvalue);
    astretchinfo->mmercount[len] += value * (GtUint64) (key-len+1);
  }
}

static GtUint64 accumulateastretch(GtDiscDistri *distastretch,
                                             const GtUchar *sequence,
                                             GtUword len)
{
  GtUword i, lenofastretch = 0;
  GtUint64 countA = 0;

  for (i=0; i<len; i++)
  {
    if (sequence[i] == 'A' || sequence[i] == 'a')
    {
      countA++;
      lenofastretch++;
    } else
    {
      if (lenofastretch > 0)
      {
        gt_disc_distri_add(distastretch,lenofastretch);
        lenofastretch = 0;
      }
    }
  }
  if (lenofastretch > 0)
  {
    gt_disc_distri_add(distastretch,lenofastretch);
  }
  return countA;
}

static void processastretches(const GtDiscDistri *distastretch,
                              GT_UNUSED GtUint64 countA)
{
  Astretchinfo astretchinfo;
  GtUword len;

  astretchinfo.sumA = 0;
  astretchinfo.maxvalue = 0;
  astretchinfo.minkey = 10UL;
  gt_disc_distri_foreach(distastretch,showastretches,&astretchinfo);
  astretchinfo.mmercount = gt_malloc(sizeof (*astretchinfo.mmercount) *
                                    (astretchinfo.maxvalue+1));
  memset(astretchinfo.mmercount,0,sizeof (*astretchinfo.mmercount) *
                                  (astretchinfo.maxvalue+1));
  gt_disc_distri_foreach(distastretch,showmeroccurrence,&astretchinfo);
  for (len=astretchinfo.minkey; len<=astretchinfo.maxvalue; len++)
  {
    /*@ignore@*/
    printf("a^{"GT_WU"} occurs "GT_LLU" times\n",
           len,astretchinfo.mmercount[len]);
    /*@end@*/
  }
  gt_assert(astretchinfo.sumA == countA);
  gt_free(astretchinfo.mmercount);
}

static int gt_seqstat_runner(int argc, const char **argv, int parsed_args,
                             void *tool_arguments, GtError *err)
{
  SeqstatArguments *arguments = tool_arguments;
  GtStrArray *files;
  GtSeqIterator *seqit;
  const GtUchar *sequence;
  char *desc;
  GtUword len;
  int i, had_err = 0;
  off_t totalsize;
  GtDiscDistri *distseqlen = NULL;
  GtAssemblyStatsCalculator *asc = NULL;
  GtLogger *asc_logger = NULL;
  GtDiscDistri *distastretch = NULL;
  uint64_t numofseq = 0, sumlength = 0;
  GtUword minlength = 0, maxlength = 0;
  GtUint64 countA = 0;
  bool minlengthdefined = false;

  gt_error_check(err);
  gt_assert(arguments);

  files = gt_str_array_new();
  for (i = parsed_args; i < argc; i++)
  {
    gt_str_array_add_cstr(files, argv[i]);
  }
  totalsize = gt_files_estimate_total_size(files);
  if (arguments->showestimsize)
  {
    printf("# estimated total size is " Formatuint64_t "\n",
              PRINTuint64_tcast(totalsize));
  }
  if (!had_err) {
    /* read input using seqiterator */
    seqit = gt_seq_iterator_sequence_buffer_new(files, err);
    if (!seqit)
      had_err = -1;
    if (!had_err)
    {
      if (arguments->dodistlen)
      {
        distseqlen = gt_disc_distri_new();
        if (arguments->binarydistlen)
          arguments->bucketsize = 1U;
      }
      if (arguments->docstats)
      {
        asc = gt_assembly_stats_calculator_new();
        gt_assembly_stats_calculator_set_genome_length(asc,
            arguments->genome_length);
      }
      if (arguments->doastretch)
      {
        distastretch = gt_disc_distri_new();
      }
      if (arguments->verbose)
      {
        gt_progressbar_start(gt_seq_iterator_getcurrentcounter(seqit,
                                                            (GtUint64)
                                                            totalsize),
                             (GtUint64) totalsize);
      }
      while (true)
      {
        desc = NULL;
        had_err = gt_seq_iterator_next(seqit, &sequence, &len, &desc, err);
        if (had_err != 1) break; /* 0: finished; 1: error */
        if (arguments->dodistlen || arguments->docstats)
        {
          if (!minlengthdefined || minlength > len)
          {
            minlength = len;
            minlengthdefined = true;
          }
          if (maxlength < len)
          {
            maxlength = len;
          }
          sumlength += (uint64_t) len;
          numofseq++;
          if (arguments->dodistlen)
          {
            gt_disc_distri_add(distseqlen,len/arguments->bucketsize);
          }
          if (arguments->docstats)
          {
            gt_assembly_stats_calculator_add(asc, len);
          }
        }
        if (arguments->doastretch)
        {
          countA += accumulateastretch(distastretch,sequence,len);
        }
      }
      if (arguments->verbose)
      {
        gt_progressbar_stop();
      }
      gt_seq_iterator_delete(seqit);
    }
  }
  gt_str_array_delete(files);
  if (!had_err && arguments->dodistlen)
  {
    printf("# " Formatuint64_t " sequences of average length %.2f\n",
             PRINTuint64_tcast(numofseq),(double) sumlength/numofseq);
    printf("# total length " Formatuint64_t "\n",
             PRINTuint64_tcast(sumlength));
    printf("# minimum length "GT_WU"\n",minlength);
    printf("# maximum length "GT_WU"\n",maxlength);
    if (arguments->binarydistlen)
    {
      FILE *distlenoutfile;
      GtStr *distlenoutfilename = gt_str_new_cstr(argv[parsed_args]);
      gt_str_append_cstr(distlenoutfilename, GT_SEQSTAT_BINARY_DISTLEN_SUFFIX);
      distlenoutfile = gt_fa_fopen(gt_str_get(distlenoutfilename), "wb", err);
      if (distlenoutfile == NULL)
        had_err = -1;
      else
      {
        /*@ignore@*/
        gt_disc_distri_foreach(distseqlen, showdistseqlenbinary,
            distlenoutfile);
        /*@end@*/
        printf("# distribution of sequence length written to file: %s\n",
          gt_str_get(distlenoutfilename));
        gt_fa_fclose(distlenoutfile);
      }
      gt_str_delete(distlenoutfilename);
    }
    else
    {
      printf("# distribution of sequence length in buckets of size %u\n",
          arguments->bucketsize);
      gt_disc_distri_foreach(distseqlen, showdistseqlen,
          &(arguments->bucketsize));
    }
    gt_disc_distri_delete(distseqlen);
  }
  if (!had_err && arguments->docstats)
  {
    asc_logger = gt_logger_new(true, GT_LOGGER_DEFLT_PREFIX, stdout);
    gt_assembly_stats_calculator_show(asc, asc_logger);
    gt_logger_delete(asc_logger);
  }
  if (asc != NULL)
    gt_assembly_stats_calculator_delete(asc);
  if (!had_err && arguments->doastretch)
  {
    processastretches(distastretch,countA);
    gt_disc_distri_delete(distastretch);
  }
  return had_err;
}

GtTool* gt_seqstat(void)
{
  return gt_tool_new(gt_seqstat_arguments_new,
                     gt_seqstat_arguments_delete,
                     gt_seqstat_option_parser_new,
                     NULL,
                     gt_seqstat_runner);
}
