/*
 * CrossFire, A Multiplayer game for X-windows
 * 
 * Copyright (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team
 * Copyright (C) 2002 Mark Wedel & Crossfire Development Team
 * Copyright (C) 1992 Frank Tore Johansen
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * The authors can be reached via e-mail at <crossfire@schmorp.de>
 */

#include <global.h>
#include <sproto.h>

/*
 * The score structure is used when treating new high-scores
 */
typedef struct scr
{
  char name[64];                // name  */
  char title[64];               // Title */
  char killer[64];              // name (+ title) or "quit" */
  sint64 exp;                   // Experience */
  char maplevel[128];           // Killed on what level */
  int maxhp, maxsp, maxgrace;   // Max hp, sp, grace when killed */
  int position;                 // Position in the highscore list */
} score;

/*
 * spool works mostly like strtok(char *, ":"), but it can also
 * log a specified error message if something goes wrong.
 */

char *
spool (char *bp, char *error)
{
  static char *prev_pos = NULL;
  char *next_pos;

  if (bp == NULL)
    {
      if (prev_pos == NULL)
        {
          LOG (llevError, "Called spool (%s) with NULL without previous call.\n", error);
          return NULL;
        }
      bp = prev_pos;
    }
  if (*bp == '\0')
    {
      LOG (llevError, "spool: End of line at %s\n", error);
      return NULL;
    }
  if ((next_pos = strchr (bp, ':')) != NULL)
    {
      *next_pos = '\0';
      prev_pos = next_pos + 1;
    }
  else
    prev_pos = NULL;
  return bp;
}

/*
 * Does what it says, copies the contents of the first score structure
 * to the second one.
 */

static void
copy_score (score *sc1, score *sc2)
{
  assign (sc2->name    , sc1->name);
  assign (sc2->title   , sc1->title);
  assign (sc2->killer  , sc1->killer);
  assign (sc2->maplevel, sc1->maplevel);
  sc2->exp = sc1->exp;
  sc2->maxhp = sc1->maxhp;
  sc2->maxsp = sc1->maxsp;
  sc2->maxgrace = sc1->maxgrace;
}

/*
 * Writes the given score structure to a static buffer, and returns
 * a pointer to it.
 */

static char *
put_score (score *sc)
{
  static char buf[MAX_BUF];

  sprintf (buf, "%s:%s:%" PRId64 ":%s:%s:%d:%d:%d",
           sc->name, sc->title, (sint64)sc->exp, sc->killer,
           sc->maplevel, sc->maxhp, sc->maxsp, sc->maxgrace);
  return buf;
}

/*
 * The oposite of put_score, get_score reads from the given buffer into
 * a static score structure, and returns a pointer to it.
 */

static score *
get_score (char *bp)
{
  static score sc;
  char *cp;

  if ((cp = strchr (bp, '\n')) != NULL)
    *cp = '\0';

  if ((cp = spool (bp, "name")) == NULL)
    return 0;

  assign (sc.name, cp);

  if ((cp = spool (0, "title")) == NULL)
    return 0;

  assign (sc.title, cp);

  if ((cp = spool (0, "score")) == NULL)
    return 0;

  sscanf (cp, "%" SCNd64, &sc.exp);

  if ((cp = spool (0, "killer")) == NULL)
    return 0;

  assign (sc.killer, cp);

  if ((cp = spool (0, "map")) == NULL)
    return 0;

  assign (sc.maplevel, cp);

  if ((cp = spool (0, "maxhp")) == NULL)
    return 0;

  sscanf (cp, "%d", &sc.maxhp);

  if ((cp = spool (0, "maxsp")) == NULL)
    return 0;

  sscanf (cp, "%d", &sc.maxsp);

  if ((cp = spool (0, "maxgrace")) == NULL)
    return 0;

  sscanf (cp, "%d", &sc.maxgrace);
  return &sc;
}

static char *
draw_one_high_score (score *sc)
{
  static char retbuf[MAX_BUF];

  if (!strncmp (sc->killer, "quit", MAX_NAME))
    sprintf (retbuf, "%3d %10lld %s the %s quit the game on map %s [%d][%d][%d].",
             sc->position, (long long) sc->exp, sc->name, sc->title, sc->maplevel, sc->maxhp, sc->maxsp, sc->maxgrace);
  else if (!strncmp (sc->killer, "left", MAX_NAME))
    sprintf (retbuf, "%3d %10lld %s the %s left the game on map %s [%d][%d][%d].",
             sc->position, (long long) sc->exp, sc->name, sc->title, sc->maplevel, sc->maxhp, sc->maxsp, sc->maxgrace);
  else
    sprintf (retbuf, "%3d %10lld %s the %s was killed by %s on map %s [%d][%d][%d].",
             sc->position, (long long) sc->exp, sc->name, sc->title, sc->killer, sc->maplevel, sc->maxhp, sc->maxsp, sc->maxgrace);
  return retbuf;
}

/*
 * add_score() adds the given score-structure to the high-score list, but
 * only if it was good enough to deserve a place.
 */

static score *
add_score (score *new_score)
{
  FILE *fp;
  static score old_score;
  score *tmp_score, pscore[HIGHSCORE_LENGTH];
  char buf[MAX_BUF], filename[MAX_BUF], *bp;
  int nrofscores = 0, flag = 0, i, comp;

  new_score->position = HIGHSCORE_LENGTH + 1;
  old_score.position = -1;
  sprintf (filename, "%s/%s", settings.localdir, HIGHSCORE);
  if ((fp = open_and_uncompress (filename, 1, &comp)) != NULL)
    {
      while (fgets (buf, MAX_BUF, fp) != NULL && nrofscores < HIGHSCORE_LENGTH)
        {
          if ((tmp_score = get_score (buf)) == NULL)
            break;
          if (!flag && new_score->exp >= tmp_score->exp)
            {
              copy_score (new_score, &pscore[nrofscores]);
              new_score->position = nrofscores;
              flag = 1;
              if (++nrofscores >= HIGHSCORE_LENGTH)
                break;
            }
          if (!strcmp (new_score->name, tmp_score->name))
            {                   /* Another entry */
              copy_score (tmp_score, &old_score);
              old_score.position = nrofscores;
              if (flag)
                continue;
            }
          copy_score (tmp_score, &pscore[nrofscores++]);
        }
      close_and_delete (fp, comp);
    }
  if (old_score.position != -1 && old_score.exp >= new_score->exp)
    return &old_score;          /* Did not beat old score */
  if (!flag && nrofscores < HIGHSCORE_LENGTH)
    copy_score (new_score, &pscore[nrofscores++]);
  if ((fp = fopen (filename, "w")) == NULL)
    {
      LOG (llevError, "Cannot write to highscore file %s: %s\n", filename, strerror (errno));
      return NULL;
    }
  for (i = 0; i < nrofscores; i++)
    {
      bp = put_score (&pscore[i]);
      fprintf (fp, "%s\n", bp);
    }
  fclose (fp);
  if (flag)
    {

/* Eneq(@csd.uu.se): Patch to fix error in adding a new score to the
   hiscore-list */
      if (old_score.position == -1)
        return new_score;
      return &old_score;
    }
  new_score->position = -1;
  if (old_score.position != -1)
    return &old_score;
  if (nrofscores)
    {
      copy_score (&pscore[nrofscores - 1], &old_score);
      return &old_score;
    }
  LOG (llevError, "Highscore error.\n");
  return NULL;
}

void
check_score (object *op)
{
  score new_score;
  score *old_score;

  if (op->stats.exp == 0)
    return;

  assign (new_score.name, op->name);
  assign (new_score.title, op->title.length () ? &op->title : op->contr->title);
  assign (new_score.killer, op->contr->killer[0] ? op->contr->killer : "a dungeon collapse");
  assign (new_score.maplevel, op->map ? op->map->name ? &op->map->name : &op->map->path : "");

  new_score.exp      = op->stats.exp;
  new_score.maxhp    = op->stats.maxhp;
  new_score.maxsp    = op->stats.maxsp;
  new_score.maxgrace = op->stats.maxgrace;

  if ((old_score = add_score (&new_score)) == NULL)
    {
      new_draw_info (NDI_UNIQUE, 0, op, "Error in the highscore list.");
      return;
    }

  if (new_score.position == -1)
    {
      new_score.position = HIGHSCORE_LENGTH + 1;        /* Not strictly correct... */
      if (!strcmp (old_score->name, new_score.name))
        new_draw_info (NDI_UNIQUE, 0, op, "You didn't beat your last highscore:");
      else
        new_draw_info (NDI_UNIQUE, 0, op, "You didn't enter the highscore list:");
      new_draw_info (NDI_UNIQUE, 0, op, draw_one_high_score (old_score));
      new_draw_info (NDI_UNIQUE, 0, op, draw_one_high_score (&new_score));
      return;
    }

  if (old_score->exp >= new_score.exp)
    new_draw_info (NDI_UNIQUE, 0, op, "You didn't beat your last score:");
  else
    new_draw_info (NDI_UNIQUE, 0, op, "You beat your last score:");

  new_draw_info (NDI_UNIQUE, 0, op, draw_one_high_score (old_score));
  new_draw_info (NDI_UNIQUE, 0, op, draw_one_high_score (&new_score));
}

/* displays the high score file.  object is the calling object
 * (null if being called via command line.)  max is the maximum
 * number of scores to display.  match, if set, is the name or class
 * to match to.
 */

void
display_high_score (object *op, int max, const char *match)
{
  const size_t maxchar = 80;
  FILE *fp;
  char buf[MAX_BUF], *scorebuf, *bp, *cp;
  int i = 0, j = 0, comp;
  score *sc;

  sprintf (buf, "%s/%s", settings.localdir, HIGHSCORE);
  if ((fp = open_and_uncompress (buf, 0, &comp)) == NULL)
    {
      LOG (llevError, "Cannot open highscore file %s: %s\n", buf, strerror (errno));
      if (op != NULL)
        new_draw_info (NDI_UNIQUE, 0, op, "There is no highscore file.");
      return;
    }
  if (op != NULL)
    clear_win_info (op);
  new_draw_info (NDI_UNIQUE, 0, op, "Nr    Score    Who [max hp][max sp][max grace]");

  while (fgets (buf, MAX_BUF, fp) != NULL)
    {
      if (j >= HIGHSCORE_LENGTH || i >= (max - 1))
        break;
      if ((sc = get_score (buf)) == NULL)
        break;
      sc->position = ++j;
      if (match == NULL)
        {
          scorebuf = draw_one_high_score (sc);
          i++;
        }
      else
        {
          if (!strcasecmp (sc->name, match) || !strcasecmp (sc->title, match))
            {
              scorebuf = draw_one_high_score (sc);
              i++;
            }
          else
            continue;
        }
      /* Replaced what seemed to an overly complicated word wrap method 
       * still word wraps, but assumes at most 2 lines of data.
       * mw - 2-12-97
       */
      assign (buf, scorebuf);

      cp = buf;
      while (strlen (cp) > maxchar)
        {
          bp = cp + maxchar - 1;
          while (*bp != ' ' && bp > cp)
            bp--;
          *bp = '\0';

          if (op == NULL)
            LOG (llevDebug, "%s\n", cp);
          else
            new_draw_info (NDI_UNIQUE, 0, op, cp);

          sprintf (buf, "            %s", bp + 1);
          cp = buf;
          i++;
        }

      if (op == NULL)
        LOG (llevDebug, "%s\n", buf);
      else
        new_draw_info (NDI_UNIQUE, 0, op, buf);
    }

  close_and_delete (fp, comp);
}