/*

 * hooks.c      -- Hooks layer

 *

 * Copyright (C) 2005-2009 Mikael Berthe <mikael@lilotux.net>

 *

 * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307

 * USA

 */

#include <loudmouth/loudmouth.h>

#include <stdlib.h>

#include <string.h>

#include <sys/types.h>

#include <unistd.h>

#include "hooks.h"

#include "screen.h"

#include "roster.h"

#include "histolog.h"

#include "hbuf.h"

#include "settings.h"

#include "utils.h"

#include "utf8.h"

#include "commands.h"

#include "main.h"

#ifdef MODULES_ENABLE

#include <glib.h>

typedef struct {

  hk_handler_t handler;

  guint32      flags;

  gpointer     userdata;

} hook_list_data_t;

static GSList *hk_handler_queue = NULL;

void hk_add_handler (hk_handler_t handler, guint32 flags, gpointer userdata)

{

  hook_list_data_t *h = g_new (hook_list_data_t, 1);

  h->handler  = handler;

  h->flags    = flags;

  h->userdata = userdata;

  hk_handler_queue = g_slist_append (hk_handler_queue, h);

}

static gint hk_queue_search_cb (hook_list_data_t *a, hook_list_data_t *b)

{

  if (a->handler == b->handler && a->userdata == b->userdata)

    return 0;

  else

    return 1;

}

void hk_del_handler (hk_handler_t handler, gpointer userdata)

{

  hook_list_data_t h = { handler, 0, userdata };

  GSList *el = g_slist_find_custom (hk_handler_queue, &h, (GCompareFunc) hk_queue_search_cb);

  if (el) {

    g_free (el->data);

    hk_handler_queue = g_slist_delete_link (hk_handler_queue, el);

  }

}

#endif

static char *extcmd;

static const char *COMMAND_ME = "/me ";

void hk_message_in(const char *bjid, const char *resname,

                   time_t timestamp, const char *msg, LmMessageSubType type,

                   guint encrypted)

{

  int new_guy = FALSE;

  int is_groupchat = FALSE; // groupchat message

  int is_room = FALSE;      // window is a room window

  int log_muc_conf = FALSE;

  int active_window = FALSE;

  int message_flags = 0;

  guint rtype = ROSTER_TYPE_USER;

  char *wmsg = NULL, *bmsg = NULL, *mmsg = NULL;

  GSList *roster_usr;

  unsigned mucnicklen = 0;

  const char *ename = NULL;

  if (encrypted == ENCRYPTED_PGP)

    message_flags |= HBB_PREFIX_PGPCRYPT;

  else if (encrypted == ENCRYPTED_OTR)

    message_flags |= HBB_PREFIX_OTRCRYPT;

  if (type == LM_MESSAGE_SUB_TYPE_GROUPCHAT) {

    rtype = ROSTER_TYPE_ROOM;

    is_groupchat = TRUE;

    log_muc_conf = settings_opt_get_int("log_muc_conf");

    if (!resname) {

      message_flags = HBB_PREFIX_INFO | HBB_PREFIX_NOFLAG;

      resname = "";

      wmsg = bmsg = g_strdup_printf("~ %s", msg);

    } else {

      wmsg = bmsg = g_strdup_printf("<%s> %s", resname, msg);

      mucnicklen = strlen(resname) + 2;

      if (!strncmp(msg, COMMAND_ME, strlen(COMMAND_ME)))

        wmsg = mmsg = g_strdup_printf("*%s %s", resname, msg+4);

    }

  } else {

    bmsg = g_strdup(msg);

    if (!strncmp(msg, COMMAND_ME, strlen(COMMAND_ME))) {

      gchar *shortid = g_strdup(bjid);

      if (settings_opt_get_int("buddy_me_fulljid") == FALSE) {

        gchar *p = strchr(shortid, '@'); // Truncate the jid

        if (p)

          *p = '\0';

      }

      wmsg = mmsg = g_strdup_printf("*%s %s", shortid, msg+4);

      g_free(shortid);

    } else

      wmsg = (char*) msg;

  }

  // If this user isn't in the roster, we add it

  roster_usr = roster_find(bjid, jidsearch, 0);

  if (!roster_usr) {

    new_guy = TRUE;

    roster_usr = roster_add_user(bjid, NULL, NULL, rtype, sub_none, -1);

    if (!roster_usr) { // Shouldn't happen...

      scr_LogPrint(LPRINT_LOGNORM, "ERROR: unable to add buddy!");

      g_free(bmsg);

      g_free(mmsg);

      return;

    }

  } else if (is_groupchat) {

    // Make sure the type is ROOM

    buddy_settype(roster_usr->data, ROSTER_TYPE_ROOM);

  }

  is_room = !!(buddy_gettype(roster_usr->data) & ROSTER_TYPE_ROOM);

  if (is_room) {

    if (!is_groupchat) {

      // This is a private message from a room participant

      g_free(bmsg);

      if (!resname) {

        resname = "";

        wmsg = bmsg = g_strdup(msg);

      } else {

        wmsg = bmsg = g_strdup_printf("PRIV#<%s> %s", resname, msg);

        if (!strncmp(msg, COMMAND_ME, strlen(COMMAND_ME))) {

          g_free(mmsg);

          wmsg = mmsg = g_strdup_printf("PRIV#*%s %s", resname, msg+4);

        }

      }

      message_flags |= HBB_PREFIX_HLIGHT;

    } else {

      // This is a regular chatroom message.

      const char *nick = buddy_getnickname(roster_usr->data);

      if (nick) {

        // Let's see if we are the message sender, in which case we'll

        // highlight it.

        if (resname && !strcmp(resname, nick)) {

          message_flags |= HBB_PREFIX_HLIGHT_OUT;

        } else if (!settings_opt_get_int("muc_disable_nick_hl")) {

          // We're not the sender.  Can we see our nick?

          const char *msgptr = msg;

          while ((msgptr = strcasestr(msgptr, nick)) != NULL) {

            const char *leftb, *rightb;

            // The message contains our nick.  Let's check it's not

            // in the middle of another word (i.e. preceded/followed

            // immediately by an alphanumeric character or an underscore.

            rightb = msgptr+strlen(nick);

            if (msgptr == msg)

              leftb = NULL;

            else

              leftb = prev_char((char*)msgptr, msg);

            msgptr = next_char((char*)msgptr);

            // Check left boundary

            if (leftb && (iswalnum(get_char(leftb)) || get_char(leftb) == '_'))

              continue;

            // Check right boundary

            if (!iswalnum(get_char(rightb)) && get_char(rightb) != '_')

              message_flags |= HBB_PREFIX_HLIGHT;

          }

        }

      }

    }

  }

  if (type  == LM_MESSAGE_SUB_TYPE_ERROR) {

    message_flags = HBB_PREFIX_ERR | HBB_PREFIX_IN;

    scr_LogPrint(LPRINT_LOGNORM, "Error message received from <%s>", bjid);

  }

  // Note: the hlog_write should not be called first, because in some

  // cases scr_WriteIncomingMessage() will load the history and we'd

  // have the message twice...

  scr_WriteIncomingMessage(bjid, wmsg, timestamp, message_flags, mucnicklen);

  // We don't log the modified message, but the original one

  if (wmsg == mmsg)

    wmsg = bmsg;

  // - We don't log the message if it is an error message

  // - We don't log the message if it is a private conf. message

  // - We don't log the message if it is groupchat message and the log_muc_conf

  //   option is off (and it is not a history line)

  if (!(message_flags & HBB_PREFIX_ERR) &&

      (!is_room || (is_groupchat && log_muc_conf && !timestamp)))

    hlog_write_message(bjid, timestamp, 0, wmsg);

  if (settings_opt_get_int("events_ignore_active_window") &&

      current_buddy && scr_get_chatmode()) {

    gpointer bud = BUDDATA(current_buddy);

    if (bud) {

      const char *cjid = buddy_getjid(bud);

      if (cjid && !strcasecmp(cjid, bjid))

        active_window = TRUE;

    }

  }

  if (settings_opt_get_int("eventcmd_use_nickname"))

    ename = roster_getname(bjid);

#ifdef MODULES_ENABLE

  {

    GSList *h = hk_handler_queue;

    if (h) {

#if 0

      hk_arg_t *args = g_new (hk_arg_t, 5);

      args[0].name = "hook";

      args[0].value = "hook-message-in";

      args[1].name = "jid";

      args[1].value = bjid;

      args[2].name = "message";

      args[2].value = wmsg;

      args[3].name = "groupchat";

      args[3].value = is_groupchat ? "true" : "false";

      args[4].name = NULL;

      args[4].value = NULL;

#else

      // We can use a const array for keys/static values, so modules

      // can do fast known to them args check by just comparing pointers...

      hk_arg_t args[] = {

        { "hook", "hook-message-in" },

        { "jid", bjid },

        { "message", wmsg },

        { "groupchat", is_groupchat ? "true" : "false" },

        { NULL, NULL },

      };

#endif

      while (h) {

        hook_list_data_t *data = h->data;

        if (data->flags & HOOK_MESSAGE_IN)

          (data->handler) (HOOK_MESSAGE_IN, args, data->userdata);

        h = g_slist_next (h);

      }

    }

  }

#endif

  // External command

  // - We do not call hk_ext_cmd() for history lines in MUC

  // - We do call hk_ext_cmd() for private messages in a room

  // - We do call hk_ext_cmd() for messages to the current window

  if (!active_window && ((is_groupchat && !timestamp) || !is_groupchat))

    hk_ext_cmd(ename ? ename : bjid, (is_groupchat ? 'G' : 'M'), 'R', wmsg);

  // Display the sender in the log window

  if ((!is_groupchat) && !(message_flags & HBB_PREFIX_ERR) &&

      settings_opt_get_int("log_display_sender")) {

    const char *name = roster_getname(bjid);

    if (!name) name = "";

    scr_LogPrint(LPRINT_NORMAL, "Message received from %s <%s/%s>",

                 name, bjid, (resname ? resname : ""));

  }

  // Beep, if enabled:

  // - if it's a private message

  // - if it's a public message and it's highlighted

  if (settings_opt_get_int("beep_on_message")) {

    if ((!is_groupchat && !(message_flags & HBB_PREFIX_ERR)) ||

        (is_groupchat  && (message_flags & HBB_PREFIX_HLIGHT)))

      scr_Beep();

  }

  // We need to update the roster if the sender is unknown or

  // if the sender is offline/invisible and a filter is set.

  if (new_guy ||

      (buddy_getstatus(roster_usr->data, NULL) == offline &&

       buddylist_isset_filter()))

  {

    update_roster = TRUE;

  }

  g_free(bmsg);

  g_free(mmsg);

}

//  hk_message_out()

// nick should be set for private messages in a chat room, and null for

// normal messages.

void hk_message_out(const char *bjid, const char *nick,

                    time_t timestamp, const char *msg,

                    guint encrypted, gpointer xep184)

{

  char *wmsg = NULL, *bmsg = NULL, *mmsg = NULL;

  guint cryptflag = 0;

  if (nick) {

    wmsg = bmsg = g_strdup_printf("PRIV#<%s> %s", nick, msg);

    if (!strncmp(msg, COMMAND_ME, strlen(COMMAND_ME))) {

      const char *mynick = roster_getnickname(bjid);

      wmsg = mmsg = g_strdup_printf("PRIV#<%s> *%s %s", nick,

                                    (mynick ? mynick : "me"), msg+4);

    }

  } else {

    wmsg = (char*)msg;

    if (!strncmp(msg, COMMAND_ME, strlen(COMMAND_ME))) {

      char *myid = jid_get_username(settings_opt_get("jid"));

      if (myid) {

        wmsg = mmsg = g_strdup_printf("*%s %s", myid, msg+4);

        g_free(myid);

      }

    }

  }

  // Note: the hlog_write should not be called first, because in some

  // cases scr_WriteOutgoingMessage() will load the history and we'd

  // have the message twice...

  if (encrypted == ENCRYPTED_PGP)

    cryptflag = HBB_PREFIX_PGPCRYPT;

  else if (encrypted == ENCRYPTED_OTR)

    cryptflag = HBB_PREFIX_OTRCRYPT;

  scr_WriteOutgoingMessage(bjid, wmsg, cryptflag, xep184);

  // We don't log private messages

  if (!nick)

    hlog_write_message(bjid, timestamp, 1, msg);

#ifdef MODULES_ENABLE

  {

    GSList *h = hk_handler_queue;

    if (h) {

      hk_arg_t args[] = {

        { "hook", "hook-message-out" },

        { "jid", bjid },

        { "message", wmsg },

        { NULL, NULL },

      };

      while (h) {

        hook_list_data_t *data = h->data;

        if (data->flags & HOOK_MESSAGE_OUT)

          (data->handler) (HOOK_MESSAGE_OUT, args, data->userdata);

        h = g_slist_next (h);

      }

    }

  }

#endif

  // External command

  hk_ext_cmd(bjid, 'M', 'S', NULL);

  g_free(bmsg);

  g_free(mmsg);

}

void hk_statuschange(const char *bjid, const char *resname, gchar prio,

                     time_t timestamp, enum imstatus status,

                     const char *status_msg)

{

  int st_in_buf;