/***************************************************************************\
*                                                                           *
*  BitlBee - An IRC to IM gateway                                           *
*  Jabber module - Handling of message(s) (tags), etc                       *
*                                                                           *
*  Copyright 2006-2012 Wilmer van der Gaast <wilmer@gaast.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.,  *
*  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.              *
*                                                                           *
\***************************************************************************/

#include "jabber.h"

static xt_status jabber_pkt_message_normal(struct xt_node *node, gpointer data, gboolean carbons_sent)
{
	struct im_connection *ic = data;
	char *from = xt_find_attr(node, carbons_sent ? "to" : "from");
	char *type = xt_find_attr(node, "type");
	char *id = xt_find_attr(node, "id");
	struct xt_node *body = xt_find_node(node->children, "body"), *c;
	struct xt_node *request = xt_find_node(node->children, "request");
	struct jabber_buddy *bud = NULL;
	char *s, *room = NULL, *reason = NULL;

	if (!from) {
		return XT_HANDLED; /* Consider this packet corrupted. */
	}

	if (request && id && g_strcmp0(type, "groupchat") != 0 && !carbons_sent) {
		/* Send a message receipt (XEP-0184), looking like this:
		 * <message from='...' id='...' to='...'>
		 *  <received xmlns='urn:xmpp:receipts' id='richard2-4.1.247'/>
		 * </message>
		 *
		 * MUC messages are excluded, since receipts aren't supposed to be sent over MUCs
		 * (XEP-0184 section 5.3) and replying to those may result in 'forbidden' errors.
		 */
		struct xt_node *received, *receipt;

		received = xt_new_node("received", NULL, NULL);
		xt_add_attr(received, "xmlns", XMLNS_RECEIPTS);
		xt_add_attr(received, "id", id);
		receipt = jabber_make_packet("message", NULL, from, received);

		jabber_write_packet(ic, receipt);
		xt_free_node(receipt);
	}

	bud = jabber_buddy_by_jid(ic, from, GET_BUDDY_EXACT);

	if (type && strcmp(type, "error") == 0) {
		/* Handle type=error packet. */
	} else if (type && from && strcmp(type, "groupchat") == 0) {
		jabber_chat_pkt_message(ic, bud, node);
	} else { /* "chat", "normal", "headline", no-type or whatever. Should all be pretty similar. */
		GString *fullmsg = g_string_new("");

		for (c = node->children; (c = xt_find_node(c, "x")); c = c->next) {
			char *ns = xt_find_attr(c, "xmlns");
			struct xt_node *inv;

			if (ns && strcmp(ns, XMLNS_MUC_USER) == 0 &&
			    (inv = xt_find_node(c->children, "invite"))) {
				/* This is an invitation. Set some vars which
				   will be passed to imcb_chat_invite() below. */
				room = from;
				if ((from = xt_find_attr(inv, "from")) == NULL) {
					from = room;
				}
				if ((inv = xt_find_node(inv->children, "reason")) && inv->text_len > 0) {
					reason = inv->text;
				}
			}
		}

		if ((s = strchr(from, '/'))) {
			if (bud) {
				bud->last_msg = time(NULL);
				from = bud->ext_jid ? bud->ext_jid : bud->bare_jid;
			} else {
				*s = 0; /* We need to generate a bare JID now. */
			}
		}

		if (type && strcmp(type, "headline") == 0) {
			if ((c = xt_find_node(node->children, "subject")) && c->text_len > 0) {
				g_string_append_printf(fullmsg, "Headline: %s\n", c->text);
			}

			/* <x xmlns="jabber:x:oob"><url>http://....</url></x> can contain a URL, it seems. */
			for (c = node->children; c; c = c->next) {
				struct xt_node *url;

				if ((url = xt_find_node(c->children, "url")) && url->text_len > 0) {
					g_string_append_printf(fullmsg, "URL: %s\n", url->text);
				}
			}
		} else if ((c = xt_find_node(node->children, "subject")) && c->text_len > 0 &&
		           (!bud || !(bud->flags & JBFLAG_HIDE_SUBJECT))) {
			g_string_append_printf(fullmsg, "<< \002BitlBee\002 - Message with subject: %s >>\n", c->text);
			if (bud) {
				bud->flags |= JBFLAG_HIDE_SUBJECT;
			}
		} else if (bud && !c) {
			/* Yeah, possibly we're hiding changes to this field now. But nobody uses
			   this for anything useful anyway, except GMail when people reply to an
			   e-mail via chat, repeating the same subject all the time. I don't want
			   to have to remember full subject strings for everyone. */
			bud->flags &= ~JBFLAG_HIDE_SUBJECT;
		}

		if (body && body->text_len > 0) { /* Could be just a typing notification. */
			fullmsg = g_string_append(fullmsg, body->text);
		}

		if (fullmsg->len > 0) {
			imcb_buddy_msg(ic, from, fullmsg->str,
			               carbons_sent ? OPT_SELFMESSAGE : 0, jabber_get_timestamp(node));
		}
		if (room) {
			imcb_chat_invite(ic, room, from, reason);
		}

		g_string_free(fullmsg, TRUE);

		/* Handling of incoming typing notifications. */
		if (bud == NULL || carbons_sent) {
			/* Can't handle these for unknown buddies.
			   And ignore them if it's just carbons */
		} else if (xt_find_node(node->children, "composing")) {
			bud->flags |= JBFLAG_DOES_XEP85;
			imcb_buddy_typing(ic, from, OPT_TYPING);
		}
		else if (xt_find_node(node->children, "active")) {
			bud->flags |= JBFLAG_DOES_XEP85;

			/* No need to send a "stopped typing" signal when there's a message. */
			if (body == NULL) {
				imcb_buddy_typing(ic, from, 0);
			}
		} else if (xt_find_node(node->children, "paused")) {
			bud->flags |= JBFLAG_DOES_XEP85;
			imcb_buddy_typing(ic, from, OPT_THINKING);
		}

		if (s) {
			*s = '/'; /* And convert it back to a full JID. */
		}
	}

	return XT_HANDLED;
}

static xt_status jabber_carbons_message(struct xt_node *node, gpointer data)
{
	struct im_connection *ic = data;
	struct xt_node *wrap, *fwd, *msg;
	gboolean carbons_sent;

	if ((wrap = xt_find_node(node->children, "received"))) {
		carbons_sent = FALSE;
	} else if ((wrap = xt_find_node(node->children, "sent"))) {
		carbons_sent = TRUE;
	}

	if (wrap == NULL || g_strcmp0(xt_find_attr(wrap, "xmlns"), XMLNS_CARBONS) != 0) {
		return XT_NEXT;
	}

	if (!(fwd = xt_find_node(wrap->children, "forwarded")) ||
	     (g_strcmp0(xt_find_attr(fwd, "xmlns"), XMLNS_FORWARDING) != 0) ||
	    !(msg = xt_find_node(fwd->children, "message"))) {
		imcb_log(ic, "Error: Invalid carbons message received");
		return XT_ABORT;
	}

	return jabber_pkt_message_normal(msg, data, carbons_sent);
}

xt_status jabber_pkt_message(struct xt_node *node, gpointer data)
{
	struct im_connection *ic = data;
	struct jabber_data *jd = ic->proto_data;
	char *from = xt_find_attr(node, "from");

	if (jabber_compare_jid(jd->me, from)) {    /* Probably a Carbons message */
		xt_status st = jabber_carbons_message(node, data);
		if (st == XT_HANDLED || st == XT_ABORT) {
			return st;
		}
	}
	return jabber_pkt_message_normal(node, data, FALSE);
}