/*
 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
 *
 * Copyright (©) 2017,2018 Marc Alexander Lehmann / the Deliantra team
 * Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015,2016 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
 * Copyright (©) 2002 Mark Wedel & Crossfire Development Team
 * Copyright (©) 1992 Frank Tore Johansen
 *
 * Deliantra is free software: you can redistribute it and/or modify it under
 * the terms of the Affero GNU General Public License as published by the
 * Free Software Foundation, either version 3 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 Affero GNU General Public License
 * and the GNU General Public License along with this program. If not, see
 * <http://www.gnu.org/licenses/>.
 *
 * The authors can be reached via e-mail to <support@deliantra.net>
 */

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

static partylist *firstparty;

partylist *
get_firstparty ()
{
  return firstparty;
}

static void
remove_party (partylist *target_party)
{
  if (firstparty == NULL)
    {
      LOG (llevError, "remove_party(): I was asked to remove party %s, but no parties are defined", target_party->partyname);
      return;
    }

  for_all_players (pl)
    if (pl->party == target_party)
      pl->party = NULL;

  partylist **prevlink = &firstparty;

  for (partylist *p = firstparty; p; p = p->next)
    if (p->next == target_party)
      {
        prevlink = &p->next;
        break;
      }

  *prevlink = target_party->next;

  free (target_party->partyleader);
  free (target_party->partyname);
  sfree (target_party);
}

/* Remove unused parties, this could be made to scale a lot better. */
void
obsolete_parties ()
{
  int player_count;
  partylist *party;
  partylist *next = NULL;

  if (!firstparty)
    return;                     /* we can't obsolete parties if there aren't any */

  for (party = firstparty; party != NULL; party = next)
    {
      next = party->next;
      player_count = 0;
      for_all_players (pl)
        if (pl->party == party)
          player_count++;
      if (player_count == 0)
        remove_party (party);
    }
}

void
add_kill_to_party (partylist *party, const char *killer, const char *dead, long exp)
{
  int i, pos;

  if (party == NULL)
    return;

  if (party->kills >= PARTY_KILL_LOG)
    {
      pos = PARTY_KILL_LOG - 1;
      for (i = 0; i < PARTY_KILL_LOG - 1; i++)
        party->party_kills[i] = party->party_kills[i + 1];
    }
  else
    pos = party->kills;

  party->kills++;
  party->total_exp += exp;
  party->party_kills[pos].exp = exp;
  assign (party->party_kills[pos].killer, killer);
  assign (party->party_kills[pos].dead, dead);
  party->party_kills[pos].killer[MAX_NAME] = 0;
  party->party_kills[pos].dead[MAX_NAME] = 0;
}

static int
confirm_party_password (object *op)
{
  partylist *tmppartylist;

  for (tmppartylist = firstparty; tmppartylist != NULL; tmppartylist = tmppartylist->next)
    {
      if (!strcmp (op->contr->party_to_join->partyname, tmppartylist->partyname))
        {
          if (strcmp (op->contr->write_buf + 1, tmppartylist->passwd) == 0)
            return 0;
          else
            return 1;
        }
    }
  return 1;
}

static void
send_party_message (object *op, const char *msg)
{
  for_all_players (pl)
    if (pl->ob->contr->party == op->contr->party && pl->ob != op)
      pl->send_msg (NDI_UNIQUE, MSG_CHANNEL ("party"), msg);
}

void
receive_party_password (object *op, char k)
{

  if (confirm_party_password (op) == 0)
    {
      partylist *joined_party = op->contr->party_to_join;
      char buf[MAX_BUF];

      op->contr->party = op->contr->party_to_join;
      op->contr->party_to_join = NULL;
      new_draw_info_format (NDI_UNIQUE, 0, op, "You have joined party: %s\n", joined_party->partyname);
      snprintf (buf, MAX_BUF, "%s joins party %s", &op->name, joined_party->partyname);
      send_party_message (op, buf);
      op->contr->ns->state = ST_PLAYING;
      return;
    }
  else
    {
      new_draw_info (NDI_UNIQUE, 0, op, "You entered the wrong password");
      op->contr->party_to_join = NULL;
      op->contr->ns->state = ST_PLAYING;
      return;
    }
}

int
command_gsay (object *op, char *params)
{
  if (!params)
    return 0;

  command_party (op, format ("say %s", params));

  return 0;
}

int
command_party (object *op, char *params)
{
  dynbuf_text &buf = msg_dynbuf; buf.clear ();

  partylist *party = op->contr->party;

  if (!params)
    params = (char *)"";

  if (!strcmp (params, "help"))
    buf << "\n"
           " - To form a party type: C<party form> <partyname>\n"
           " - To join a party type: C<party join> <partyname>\n"
           " - If the party has a passwd, it will you prompt you for it.\n"
           " - For a list of current parties type: C<party list>\n"
           " - To leave a party type: C<party leave>\n"
           " - To change a passwd for a party type: C<party passwd> <password>\n"
           " - There is an 8 character max\n"
           " - To talk to party members type: C<party say> <msg>\n"
           " - To see who is in your party: C<party who>\n"
           " - To see what you've killed, type: C<party kills>\n";
  else if (strncmp (params, "form ", 5) == 0)
    {
      params += 5;

      if (party)
        buf << "You are already a member of party " << party->partyname << ". You must leave it first.";
      else
        {
          for (partylist *tmpparty = firstparty; tmpparty; tmpparty = tmpparty->next)
            {
              if (!strcmp (tmpparty->partyname, params))
                {
                  buf << "The party " << tmpparty->partyname << " already exists, pick another name";
                  goto reply;
                }
            }

          /* Forms the party struct for a party called 'params'. it is the responsibility
           * of the caller to ensure that the name is unique, and that it is placed in the
           * main party list correctly */

          party = salloc0<partylist> ();
          party->partyname = strdup (params);
          party->total_exp = 0;
          party->kills = 0;
          party->passwd[0] = '\0';
          party->next = NULL;
          party->partyleader = strdup (op->name);

          buf << "You have formed party: " << party->partyname << ".";

          party->next = firstparty;
          op->contr->party = firstparty = party;
        }
    }
  else if (strcmp (params, "list") == 0)
    {
      if (!firstparty)
        buf << "There are no parties active right now";
      else
        {
          buf << "Party name                       Leader\n\n"
                 "----------                       ------\n\n";

          for (partylist *p = firstparty; p; p = p->next)
            buf.printf ("%-32s %s\n\n", p->partyname, p->partyleader);
        }
    }
  else if (strncmp (params, "join ", 5) == 0)
    {
      params += 5;

      /* Can't join a party cause non exist */
      if (!firstparty)
        buf << "Party: " << params << " does not exist.  You must form it first.";
      else if (party)
        buf << "You are already a member of party " << party->partyname << ". You must leave it first.";
      else
        for (partylist *p = firstparty; p; p = p->next)
          if (!strcmp (p->partyname, params))
            {
              if (!*p->passwd)
                {
                  op->contr->party = p;

                  buf << op->name << " joins party " << p->partyname << ".";
                  send_party_message (op, buf);
                  buf.clear ();

                  buf << "You have joined party: " << p->partyname << ".";
                }
              else
                get_party_password (op, p);

              goto reply;
            }
          else
            buf << "Party " << params << " does not exist. You must form it first.";
    }
  else if (!party)
    buf << "You are not a member of any party.\n\n"
           "For help try: C<party help>";
  else if (!*params)
    buf << "You are a member of party " << party->partyname << ".";
  else if (!strncmp (params, "kills", 5))
    {
      if (!party->kills)
        buf << "You haven't killed anything yet.";
      else
        {
          int max = min (party->kills - 1, PARTY_KILL_LOG - 1);

          buf << " Killed          |          Killer|     Exp\n"
              << " ----------------+----------------+--------\n";

          for (int i = 0; i <= max; i++)
            {
              sint64 exp = party->party_kills[i].exp;
              char suffix = ' ';
              if (exp > 1000000)
                {
                  exp /= 1000000;
                  suffix = 'M';
                }
              else if (exp > 1000)
                {
                  exp /= 1000;
                  suffix = 'k';
                }

              buf.printf (" %16s|%16s|%6.1f%c\n", party->party_kills[i].dead, party->party_kills[i].killer, (double)exp, suffix);
            }

          buf << " ----------------+----------------+--------\n";

          {
            sint64 exp = party->total_exp;
            char suffix = ' ';

            if (exp > 1000000)
              {
                exp /= 1000000;
                suffix = 'M';
              }
            else if (exp > 1000)
              {
                exp /= 1000;
                suffix = 'k';
              }

              buf.printf (" Totals: %d kills, %.1f%c exp", party->kills, (double)exp, suffix);
          }
        }
    }
  else if (strncmp (params, "say ", 4) == 0)
    {
      params += 4;

      buf << "[" << party->partyname << "] " << op->name << " says: " << params;
      send_party_message (op, buf);
      buf.clear ();

      buf << "[" << party->partyname << "] You say: " << params;
    }
  else if (strcmp (params, "leave") == 0)
    {
      buf << op->name << " leaves party " << party->partyname << ".";
      send_party_message (op, buf);
      buf.clear ();

      buf << "You leave party " << party->partyname << ".";

      op->contr->party = 0;
      obsolete_parties ();
    }
  else if (strcmp (params, "who") == 0)
    {
      buf << "Members of party " << party->partyname << ".\n";

      for_all_players (pl)
        if (pl->ob->contr->party == party)
          buf.printf (" - %s/%d %s\n\n", &pl->ob->name, pl->ob->level,
                      *pl->ob->contr->own_title ? pl->ob->contr->own_title : pl->ob->contr->title);
    }
  else if (strncmp (params, "passwd ", 7) == 0)
    {
      params += 7;

      if (strlen (params) > 8)
        buf << "The password must not exceed 8 characters";
      else
        {
          strcpy (party->passwd, params);
          buf << "The password for party " << party->partyname << " is set to B<" << params << "> by " << &op->name;
        }
    }
  else
    buf << "I did not understand your command. For help try: C<party help>";

reply:
  op->contr->send_msg (NDI_UNIQUE | NDI_REPLY, MSG_CHANNEL ("party"), buf);

  return 1;
}