/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */

/*

 * Copyright (C) 2003-2006 Imendio AB

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser 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

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser 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 <config.h>

#include <string.h>

#include <sys/stat.h> 

#include <sys/types.h>

#include <fcntl.h>

#include <glib.h>

#include "lm-sock.h"

#include "lm-debug.h"

#include "lm-error.h"

#include "lm-internals.h"

#include "lm-message-queue.h"

#include "lm-misc.h"

#include "lm-ssl-internals.h"

#include "lm-parser.h"

#include "lm-sha.h"

#include "lm-connection.h"

#include "lm-utils.h"

#include "lm-socket.h"

typedef struct {

	LmHandlerPriority  priority;

	LmMessageHandler  *handler;

} HandlerData;

struct _LmConnection {

	/* Parameters */

	GMainContext *context;

	gchar        *server;

	gchar        *jid;

	guint         port;

	LmSocket     *socket;

	LmSSL        *ssl;

	LmProxy      *proxy;

	LmParser     *parser;

	gchar        *stream_id;

	GHashTable   *id_handlers;

	GSList       *handlers[LM_MESSAGE_TYPE_UNKNOWN];

	/* Communication */

	guint         open_id;

	LmCallback   *open_cb;

 	gboolean      async_connect_waiting;

	gboolean      blocking;

	gboolean      cancel_open;

	LmCallback   *auth_cb;

	LmCallback   *disconnect_cb;

	LmMessageQueue *queue;

	LmConnectionState state;

	guint         keep_alive_rate;

	GSource      *keep_alive_source;

	gint          ref_count;

};

typedef enum {

	AUTH_TYPE_PLAIN  = 1,

	AUTH_TYPE_DIGEST = 2,

	AUTH_TYPE_0K     = 4

} AuthType;

static void     connection_free (LmConnection *connection);

static void     connection_handle_message    (LmConnection         *connection,

					      LmMessage            *message);

static void     connection_new_message_cb    (LmParser             *parser,

					      LmMessage            *message,

					      LmConnection         *connection);

static gboolean connection_do_open           (LmConnection         *connection,

					      GError              **error);

static LmMessage *     connection_create_auth_req_msg (const gchar *username);

static LmMessage *     connection_create_auth_msg     (LmConnection *connection,

						       const gchar  *username,

						       const gchar  *password,

						       const gchar  *resource,

						       gint          auth_type);

static LmHandlerResult connection_auth_req_reply (LmMessageHandler *handler,

						  LmConnection     *connection,

						  LmMessage        *m,

						  gpointer          user_data);

static int connection_check_auth_type            (LmMessage      *auth_req_rpl);

static LmHandlerResult

connection_auth_reply                            (LmMessageHandler *handler,

						  LmConnection     *connection,

						  LmMessage        *m,

						  gpointer          user_data);

static void      connection_stream_received      (LmConnection    *connection, 

						  LmMessage       *m);

static gint      connection_handler_compare_func (HandlerData     *a,

						  HandlerData     *b);

static gboolean  connection_send_keep_alive      (LmConnection    *connection);

static void      connection_start_keep_alive     (LmConnection    *connection);

static void      connection_stop_keep_alive      (LmConnection    *connection);

static gboolean  connection_send                 (LmConnection    *connection, 

						  const gchar     *str, 

						  gint             len, 

						  GError         **error);

static void      connection_message_queue_cb     (LmMessageQueue  *queue,

						  LmConnection    *connection);

static void      connection_incoming_data        (LmSocket        *socket, 

						  const gchar     *buf,

						  LmConnection    *connection);

static void

connection_free (LmConnection *connection)

{

	int        i;

	g_free (connection->server);

	g_free (connection->jid);

	if (connection->parser) {

		lm_parser_free (connection->parser);

	}

	/* Unref handlers */

	for (i = 0; i < LM_MESSAGE_TYPE_UNKNOWN; ++i) {

		GSList *l;

		for (l = connection->handlers[i]; l; l = l->next) {

			HandlerData *hd = (HandlerData *) l->data;

			lm_message_handler_unref (hd->handler);

			g_free (hd);

		}

		g_slist_free (connection->handlers[i]);

	}

	g_hash_table_destroy (connection->id_handlers);

	if (connection->state >= LM_CONNECTION_STATE_OPENING) {

		_lm_connection_do_close (connection);

	}

	if (connection->open_cb) {

		_lm_utils_free_callback (connection->open_cb);

	}

	if (connection->auth_cb) {

		_lm_utils_free_callback (connection->auth_cb);

	}

	lm_connection_set_disconnect_function (connection, NULL, NULL, NULL);

	if (connection->proxy) {

		lm_proxy_unref (connection->proxy);

	}

	lm_message_queue_unref (connection->queue);

        if (connection->context) {

                g_main_context_unref (connection->context);

        }

	if (connection->socket) {

		lm_socket_unref (connection->socket);

	}

        g_free (connection);

}

static void

connection_handle_message (LmConnection *connection, LmMessage *m)

{

	LmMessageHandler *handler;

	GSList           *l;

	const gchar      *id;

	LmHandlerResult   result = LM_HANDLER_RESULT_ALLOW_MORE_HANDLERS;

	lm_connection_ref (connection);

	if (lm_message_get_type (m) == LM_MESSAGE_TYPE_STREAM) {

		connection_stream_received (connection, m);

		goto out;

	}

	id = lm_message_node_get_attribute (m->node, "id");

	if (id) {

		handler = g_hash_table_lookup (connection->id_handlers, id);

		if (handler) {

			result = _lm_message_handler_handle_message (handler, 

								     connection,

								     m);

			g_hash_table_remove (connection->id_handlers, id);

		}

	}

	if (result == LM_HANDLER_RESULT_REMOVE_MESSAGE) {

		goto out;

	}

	for (l = connection->handlers[lm_message_get_type (m)]; 

	     l && result == LM_HANDLER_RESULT_ALLOW_MORE_HANDLERS; 

	     l = l->next) {

		HandlerData *hd = (HandlerData *) l->data;

		result = _lm_message_handler_handle_message (hd->handler,

							     connection,

							     m);

	}

out:

	lm_connection_unref (connection);

	return;

}

static void

connection_new_message_cb (LmParser     *parser,

			   LmMessage    *m,

			   LmConnection *connection)

{

	const gchar *from;

	lm_message_ref (m);

	from = lm_message_node_get_attribute (m->node, "from");

	if (!from) {

		from = "unknown";

	}

	lm_verbose ("New message with type=\"%s\" from: %s\n",

		    _lm_message_type_to_string (lm_message_get_type (m)),

		    from);

	lm_message_queue_push_tail (connection->queue, m);

}

static gboolean

connection_send_keep_alive (LmConnection *connection)

{ 

	if (!connection_send (connection, " ", -1, NULL)) {

		lm_verbose ("Error while sending keep alive package!\n");

	}

	return TRUE;

}

static void

connection_start_keep_alive (LmConnection *connection)

{

	if (connection->keep_alive_source) {

		connection_stop_keep_alive (connection);

	}

	if (connection->keep_alive_rate > 0) {

		connection->keep_alive_source =

			lm_misc_add_timeout (connection->context,

					     connection->keep_alive_rate,

					     (GSourceFunc) connection_send_keep_alive,

					     connection);

	}

}

static void

connection_stop_keep_alive (LmConnection *connection)

{

	if (connection->keep_alive_source) {

		g_source_destroy (connection->keep_alive_source);

	}

	connection->keep_alive_source = NULL;

}

static gboolean

connection_send (LmConnection  *connection, 

		 const gchar   *str, 

		 gint           len, 

		 GError       **error)

{

	gint b_written;

	if (connection->state < LM_CONNECTION_STATE_OPENING) {

		g_log (LM_LOG_DOMAIN,LM_LOG_LEVEL_NET,

		       "Connection is not open.\n");

		g_set_error (error,

			     LM_ERROR,

			     LM_ERROR_CONNECTION_NOT_OPEN,

			     "Connection is not open, call lm_connection_open() first");

		return FALSE;

	}

	if (len == -1) {

		len = strlen (str);

	}

	g_log (LM_LOG_DOMAIN, LM_LOG_LEVEL_NET, "\nSEND:\n");

	g_log (LM_LOG_DOMAIN, LM_LOG_LEVEL_NET, 

	       "-----------------------------------\n");

	g_log (LM_LOG_DOMAIN, LM_LOG_LEVEL_NET, "%s\n", str);

	g_log (LM_LOG_DOMAIN, LM_LOG_LEVEL_NET, 

	       "-----------------------------------\n");

	/* Check to see if there already is an output buffer, if so, add to the

	   buffer and return */

	if (lm_socket_output_is_buffered (connection->socket, str, len)) {

		return TRUE;

	}

	b_written = lm_socket_do_write (connection->socket, str, len);

	if (b_written < 0) {

		_lm_connection_error_event (connection->socket, 

					    G_IO_HUP,

					    connection);

		return FALSE;

	}

	if (b_written < len) {

		lm_socket_setup_output_buffer (connection->socket, 

						str + b_written, 

						len - b_written);

	}

	return TRUE;

}

static void

connection_message_queue_cb (LmMessageQueue  *queue,

			     LmConnection    *connection)

{

	LmMessage *m;

	m = lm_message_queue_pop_nth (connection->queue, 0);

	if (m) {

		connection_handle_message (connection, m);

		lm_message_unref (m);

	}

}

/* Returns directly */

/* Setups all data needed to start the connection attempts */

static gboolean

connection_do_open (LmConnection *connection, GError **error) 

{

	if (lm_connection_is_open (connection)) {

		g_set_error (error,

			     LM_ERROR,

			     LM_ERROR_CONNECTION_NOT_OPEN,

			     "Connection is already open, call lm_connection_close() first");

		return FALSE;

	}

	if (!connection->server) {

		g_set_error (error,

			     LM_ERROR,

			     LM_ERROR_CONNECTION_FAILED,

			     "You need to set the server hostname in the call to lm_connection_new()");

		return FALSE;

	}

	lm_message_queue_attach (connection->queue, connection->context);