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

/*

 * Copyright (C) 2003 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 "lm-internals.h"

#include "lm-message.h"

#define PRIV(o) ((LmMessage *)o)->priv

static struct TypeNames 

{

        LmMessageType  type;

        const gchar   *name;

} type_names[] = {

	{ LM_MESSAGE_TYPE_MESSAGE,       "message"       },

	{ LM_MESSAGE_TYPE_PRESENCE,      "presence"      },

	{ LM_MESSAGE_TYPE_IQ,            "iq"            },

	{ LM_MESSAGE_TYPE_STREAM,        "stream:stream" },

	{ LM_MESSAGE_TYPE_STREAM_ERROR,  "stream:error"  }

};

static struct SubTypeNames 

{

        LmMessageSubType  type;

        const gchar      *name;

} sub_type_names[] = {

	{ LM_MESSAGE_SUB_TYPE_NORMAL,          "normal"        },

        { LM_MESSAGE_SUB_TYPE_CHAT,            "chat"          },

	{ LM_MESSAGE_SUB_TYPE_GROUPCHAT,       "groupchat"     },

	{ LM_MESSAGE_SUB_TYPE_HEADLINE,        "headline"      },

	{ LM_MESSAGE_SUB_TYPE_UNAVAILABLE,     "unavailable"   },

        { LM_MESSAGE_SUB_TYPE_PROBE,           "probe"         },

	{ LM_MESSAGE_SUB_TYPE_SUBSCRIBE,       "subscribe"     },

	{ LM_MESSAGE_SUB_TYPE_UNSUBSCRIBE,     "unsubscribe"   },

	{ LM_MESSAGE_SUB_TYPE_SUBSCRIBED,      "subscribed"    },

	{ LM_MESSAGE_SUB_TYPE_UNSUBSCRIBED,    "unsubscribed"  },

	{ LM_MESSAGE_SUB_TYPE_GET,             "get"           },

	{ LM_MESSAGE_SUB_TYPE_SET,             "set"           },

	{ LM_MESSAGE_SUB_TYPE_RESULT,          "result"        }, 

	{ LM_MESSAGE_SUB_TYPE_ERROR,           "error"         }

};

struct LmMessagePriv {

	LmMessageType    type;

	LmMessageSubType sub_type;

	gint             ref_count;

};

static LmMessageType

message_type_from_string (const gchar *type_str)

{

        gint i;

        if (!type_str) {

                return LM_MESSAGE_TYPE_UNKNOWN;

        }

        for (i = LM_MESSAGE_TYPE_MESSAGE;

	     i <= LM_MESSAGE_TYPE_STREAM_ERROR;

	     ++i) {

                if (strcmp (type_str, type_names[i].name) == 0) {

                        return i;

                }

        }

        return LM_MESSAGE_TYPE_UNKNOWN;

}

const gchar *

_lm_message_type_to_string (LmMessageType type)

{

        if (type < LM_MESSAGE_TYPE_MESSAGE ||

            type > LM_MESSAGE_TYPE_STREAM_ERROR) {

                type = LM_MESSAGE_TYPE_UNKNOWN;

        }

        return type_names[type].name;

}

static LmMessageSubType

message_sub_type_from_string (const gchar *type_str)

{

        gint i;

        if (!type_str) {

                return LM_MESSAGE_SUB_TYPE_NOT_SET;

        }

        for (i = LM_MESSAGE_SUB_TYPE_NORMAL;

	     i <= LM_MESSAGE_SUB_TYPE_ERROR;

	     ++i) {

                if (g_ascii_strcasecmp (type_str, 

					sub_type_names[i].name) == 0) {

                        return i;

                }

        }

        return LM_MESSAGE_SUB_TYPE_NOT_SET;

}

const gchar *

_lm_message_sub_type_to_string (LmMessageSubType type)

{

        if (type < LM_MESSAGE_SUB_TYPE_NORMAL ||

            type > LM_MESSAGE_SUB_TYPE_ERROR) {

		return NULL;

        }

        return sub_type_names[type].name;

}

static LmMessageSubType

message_sub_type_when_unset (LmMessageType type) {

	LmMessageSubType sub_type = LM_MESSAGE_SUB_TYPE_NORMAL;

	switch (type) {

	case LM_MESSAGE_TYPE_MESSAGE:

		/* A message without type should be handled like a message with

		 * type=normal, but we won't set it to that since then the user

		 * will not know if it's set or not.

		 */

		sub_type = LM_MESSAGE_SUB_TYPE_NOT_SET;

		break;

	case LM_MESSAGE_TYPE_PRESENCE:

		sub_type = LM_MESSAGE_SUB_TYPE_AVAILABLE;

		break;

	case LM_MESSAGE_TYPE_IQ:

		sub_type = LM_MESSAGE_SUB_TYPE_GET;

		break;

	default:

		break;

	}

	return sub_type;

}

LmMessage *

_lm_message_new_from_node (LmMessageNode *node)

{

	LmMessage        *m;

	LmMessageType     type;

	LmMessageSubType  sub_type;

	const gchar      *sub_type_str;

	type = message_type_from_string (node->name);

	if (type == LM_MESSAGE_TYPE_UNKNOWN) {

		return NULL;

	}

	sub_type_str = lm_message_node_get_attribute (node, "type");

	if (sub_type_str) {

		sub_type = message_sub_type_from_string (sub_type_str);

	} else {

		sub_type = message_sub_type_when_unset (type);

	}

	m = g_new0 (LmMessage, 1);

	m->priv = g_new0 (LmMessagePriv, 1);

	PRIV(m)->ref_count = 1;

	PRIV(m)->type = type;

	PRIV(m)->sub_type = sub_type;

	m->node = lm_message_node_ref (node);

	return m;

}

/**

 * lm_message_new:

 * @to: receipient jid

 * @type: message type

 * 

 * Creates a new #LmMessage which can be sent with lm_connection_send() or 

 * lm_connection_send_with_reply(). If @to is %NULL the message is sent to the

 * server. The returned message should be unreferenced with lm_message_unref() 

 * when caller is finished with it.

 * 

 * Return value: a newly created #LmMessage

 **/

LmMessage *

lm_message_new (const gchar *to, LmMessageType type)

{

	LmMessage *m;

	gchar     *id;

	m       = g_new0 (LmMessage, 1);

	m->priv = g_new0 (LmMessagePriv, 1);

	PRIV(m)->ref_count = 1;

	PRIV(m)->type      = type;

	PRIV(m)->sub_type  = message_sub_type_when_unset (type);

	m->node = _lm_message_node_new (_lm_message_type_to_string (type));

	id = _lm_utils_generate_id ();

	lm_message_node_set_attribute (m->node, "id", id);

	g_free (id);

	if (to) {

		lm_message_node_set_attribute (m->node, "to", to);

	}

	if (type == LM_MESSAGE_TYPE_IQ) {

		lm_message_node_set_attribute (m->node, "type", "get");

	}

	return m;

}

/**

 * lm_message_new_with_sub_type:

 * @to: receipient jid

 * @type: message type

 * @sub_type: message sub type

 * 

 * Creates a new #LmMessage with sub type set. See lm_message_new() for more 

 * information.

 * 

 * Return value: a newly created #LmMessage

 **/

LmMessage *

lm_message_new_with_sub_type (const gchar      *to,

			      LmMessageType     type, 

			      LmMessageSubType  sub_type)

{

	LmMessage   *m;

	const gchar *type_str;

	m = lm_message_new (to, type);

	type_str = _lm_message_sub_type_to_string (sub_type);

	if (type_str) {

		lm_message_node_set_attributes (m->node,

						"type", type_str, NULL);

		PRIV(m)->sub_type = sub_type;

	}

	return m;

}

/**

 * lm_message_get_type:

 * @message: an #LmMessage

 * 

 * Fetches the type of @message.

 * 

 * Return value: the message type

 **/

LmMessageType

lm_message_get_type (LmMessage *message)

{

	g_return_val_if_fail (message != NULL, LM_MESSAGE_TYPE_UNKNOWN);

	return PRIV(message)->type;

}

/**

 * lm_message_get_sub_type:

 * @message: 

 * 

 * Fetches the sub type of @message.

 * 

 * Return value: the message sub type

 **/

LmMessageSubType

lm_message_get_sub_type (LmMessage *message)

{

	g_return_val_if_fail (message != NULL, LM_MESSAGE_TYPE_UNKNOWN);

	return PRIV(message)->sub_type;

}

/**

 * lm_message_get_node:

 * @message: an #LmMessage

 * 

 * Retrieves the root node from @message.

 * 

 * Return value: an #LmMessageNode

 **/

LmMessageNode *

lm_message_get_node (LmMessage *message)

{

	g_return_val_if_fail (message != NULL, NULL);

	return message->node;

}

/**

 * lm_message_ref:

 * @message: an #LmMessage

 * 

 * Adds a reference to @message.

 * 

 * Return value: the message

 **/

LmMessage *

lm_message_ref (LmMessage *message)

{

	g_return_val_if_fail (message != NULL, NULL);

	PRIV(message)->ref_count++;

	return message;

}

/**

 * lm_message_unref:

 * @message: an #LmMessage

 * 

 * Removes a reference from @message. When no more references are present the 

 * message is freed.

 **/

void

lm_message_unref (LmMessage *message)

{

	g_return_if_fail (message != NULL);

	PRIV(message)->ref_count--;

	if (PRIV(message)->ref_count == 0) {

		lm_message_node_unref (message->node);

		g_free (message->priv);

		g_free (message);

	}

}