/* Copyright 2009 Myhailo Danylenko

This file is part of lua-lm.

lua-lm 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, see <http://www.gnu.org/licenses/>. */

#include <lua.h>

#include <lauxlib.h>

#include <glib.h>			// GDestroyNotify, GMainContext

#include <loudmouth/loudmouth.h>

#include "config.h"

#include "util.h"

#include "lm_types.h"

#include "lm_message.h"

#include "lm_message_handler.h"

/// lm.connection

/// Central module, representing connection to the server.

/// You should create a new connection object, then open it (establish

/// connection), then authenticate to the server.

/// connection state

/// Stirng, representing current connection state.

/// G:

const string2enum_t state_lm_connection[] = {

	{ "closed",         LM_CONNECTION_STATE_CLOSED         },

	{ "opening",        LM_CONNECTION_STATE_OPENING        },

	{ "open",           LM_CONNECTION_STATE_OPEN           },

	{ "authenticating", LM_CONNECTION_STATE_AUTHENTICATING },

	{ "authenticated",  LM_CONNECTION_STATE_AUTHENTICATED  },

	{ NULL,             0                                  }, // XXX

};

/// handler priority

/// String, according to which handler will be placed into one

/// of three handler groups.

/// G:

const string2enum_t priority_lm_handler[] = {

	{ "last",   LM_HANDLER_PRIORITY_LAST   },

	{ "normal", LM_HANDLER_PRIORITY_NORMAL },

	{ "first",  LM_HANDLER_PRIORITY_FIRST  },

	{ NULL,     0                          }, // XXX

};

/// disconnect reason

/// String, indicating the reason of disconnection occured.

/// G:

static const string2enum_t llm_disconnect_reason[] = {

	{ "ok",                LM_DISCONNECT_REASON_OK                },

	{ "ping time out",     LM_DISCONNECT_REASON_PING_TIME_OUT     },

	{ "hup",               LM_DISCONNECT_REASON_HUP               },

	{ "error",             LM_DISCONNECT_REASON_ERROR             },

	{ "resource conflict", LM_DISCONNECT_REASON_RESOURCE_CONFLICT },

	{ "invalid xml",       LM_DISCONNECT_REASON_INVALID_XML       },

	{ "unknown",           LM_DISCONNECT_REASON_UNKNOWN           },

	{ "ping_time_out",     LM_DISCONNECT_REASON_PING_TIME_OUT     },

	{ "resource_conflict", LM_DISCONNECT_REASON_RESOURCE_CONFLICT },

	{ "invalid_xml",       LM_DISCONNECT_REASON_INVALID_XML       },

	{ NULL,                0                                      }, // XXX

};

/// lm.connection.new

/// Creates a new connection (closed).

/// A: string (server name), lightuserdata (C glib main context object, optional)

/// R: lm connection object

static int new_lm_connection (lua_State *L)

{

	const char *server = luaL_checkstring (L, 1);

	LmConnection *connection;

	if (lua_gettop (L) < 2)

		connection = lm_connection_new (server);

	else {

		luaL_argcheck (L, lua_islightuserdata (L, 2), 2, "glib main context lightuserdata expected");

		connection = lm_connection_new_with_context (server, (GMainContext *) lua_touserdata (L, 2));

	}

	bless_lm_connection (L, connection);

	lm_connection_unref (connection);

	D ("Connection %p created", connection);

	return 1;

}

/// lm.connection.bless

/// Blesses given pointer to lm connection object.

/// Note: it adds a reference to connection.

/// A: lightuserdata (C lm connection object)

/// R: lm connection object

static int bless_lua_lm_connection (lua_State *L)

{

	luaL_argcheck (L, lua_islightuserdata (L, 1), 1, "loudmouth connection lightuserdata expected");

	bless_lm_connection (L, (LmConnection *) lua_touserdata (L, 1));

	return 1;

}

/// connection callback function

/// User function, that will be called on connection establishment operation end,

/// eg. successful/unsuccessful opening or authentication.

/// A: lm connection object, boolean (success)

static void callback_lm_connection (LmConnection *connection, int success, llm_callback_t *cb)

{

	lua_rawgeti (cb->L, LUA_REGISTRYINDEX, cb->reference);

	bless_lm_connection (cb->L, connection);

	// XXX lm_connection_unref (connection);

	lua_pushboolean (cb->L, success);

	if (lua_pcall (cb->L, 2, 0, 0)) {

		W ("Connection callback error: %s", lua_tostring (cb->L, -1));

		lua_pop (cb->L, 1);

	}

}

/// connection:open

/// Opens connection to the server and then calls callback function.

/// A: connection callback function

/// R: lm connection object or nil, string (error message)

static int open_lm_connection (lua_State *L)

{

	llm_connection_t *object = luaL_checklm_connection (L, 1);

	llm_callback_t *cb;

	GError *err = NULL;

	luaL_argcheck (L, lua_isfunction (L, 2), 2, "function expected");

	cb = luaL_malloc (L, sizeof (llm_callback_t));

	cb->reference = luaL_ref (L, LUA_REGISTRYINDEX);

	cb->L         = L;

	if (lm_connection_open (object->connection, (LmResultFunction) callback_lm_connection,

				 cb, (GDestroyNotify) llm_callback_destroy, &err))

		return 1;

	else {

		lua_pushnil (L);

		lua_pushstring (L, err->message);

		I ("Connection opening failed: %s", err -> message);

		g_error_free (err);

		return 2;

	}

}

/// connection:authenticate

/// Tries to authenticate against opened connection, then calls callback function.

/// A: string (username), string (password), string (resource), connection callback function

/// R: lm connection object or nil, string (error message)

static int authenticate_lm_connection (lua_State *L)

{

	llm_connection_t *object   = luaL_checklm_connection (L, 1);

	const char       *username = luaL_checkstring (L, 2);

	const char       *password = luaL_checkstring (L, 3);

	const char       *resource = luaL_checkstring (L, 4);

	GError           *err      = NULL;

	llm_callback_t   *cb;

	luaL_argcheck (L, lua_isfunction (L, 5), 5, "function expected");

	cb = luaL_malloc (L, sizeof (llm_callback_t));

	cb->reference = luaL_ref (L, LUA_REGISTRYINDEX);

	cb->L         = L;

	if (lm_connection_authenticate (object->connection, username, password, resource,

						(LmResultFunction) callback_lm_connection, cb,

						(GDestroyNotify) llm_callback_destroy, &err)) {

		lua_pop (L, 3);

		return 1;

	} else {

		lua_pushnil (L);

		lua_pushstring (L, err->message);

		I ("Connection authentication failed: %s", err->message);

		g_error_free (err);

		return 2;

	}

}

/// connection:port

/// Gets or sets server port to connect.

/// A: integer (optional)

/// R: integer (when called with no args) or lm connection object

static int port_lm_connection (lua_State *L)

{

	llm_connection_t *object = luaL_checklm_connection (L, 1);

	if (lua_gettop (L) > 1) { // Set

		lm_connection_set_port (object->connection, luaL_checkint (L, 2));

		lua_pop (L, 1);

	} else { // Get

		lua_pushnumber (L, lm_connection_get_port (object->connection));

	}

	return 1;

}

/// connection:server

/// Gets or sets server to connect to.

/// A: string (optional, server name)

/// R: string (when called with no args) or lm connection object

static int server_lm_connection (lua_State *L)

{

	llm_connection_t *object = luaL_checklm_connection (L, 1);

	if (lua_gettop (L) > 1) { // Set

		lm_connection_set_server (object->connection, luaL_checkstring (L, 2));

		lua_pop (L, 1);

	} else { // Get

		lua_pushstring (L, lm_connection_get_server (object->connection));

	}

	return 1;

}

/// connection:jid

/// Gets or sets jid for connection.

/// A: string (optional)

/// R: string (when called with no args) or lm connection object

static int jid_lm_connection (lua_State *L)

{

	llm_connection_t *object = luaL_checklm_connection (L, 1);

	if (lua_gettop (L) > 1) { // Set

		lm_connection_set_jid (object->connection, luaL_checkstring (L, 2));

		lua_pop (L, 1);

	} else { // Get

		lua_pushstring (L, lm_connection_get_jid (object->connection));

	}

	return 1;

}

/// connection:keep_alive_rate

/// Gets or sets keep alive packets rate for connection.

/// Note, that on some platforms there is no get function even in

/// loudmouth versions, that should have it according to documentation.

/// integer (optional, seconds)

/// integer (when called with no args) or lm connection object or nil, string (error message, when get function is not available in loudmouth)

static int keep_alive_rate_lm_connection (lua_State *L)

{

	llm_connection_t *object = luaL_checklm_connection (L, 1);

	if (lua_gettop (L) > 1) { // Set

		lm_connection_set_keep_alive_rate (object->connection, luaL_checkint (L, 2));

		lua_pop (L, 1);

		return 1;

	} else { // Get

#ifdef HAVE_LM_CONNECTION_GET_KEEP_ALIVE_RATE

		lua_pushnumber (L, lm_connection_get_keep_alive_rate (object->connection));

		return 1;

#else

		W ("Sorry, your loudmouth have no get_keep_alive_rate ()");

		lua_pushnil (L);

		lua_pushliteral (L, "Sorry, your loudmouth have no get_keep_alive_rate ()");

		return 2;

#endif

	}

}

/// connection:proxy

/// Gets or sets proxy server for connection.

/// A: lm proxy object (optional)

/// R: lm proxy object or nil (when called with no args) or lm connection object

static int proxy_lm_connection (lua_State *L)

{

	llm_connection_t *object = luaL_checklm_connection (L, 1);

	if (lua_gettop (L) > 1) { // Set

		llm_proxy_t *proxy = luaL_checklm_proxy (L, 2);

		lm_connection_set_proxy (object->connection, proxy->proxy);

		lua_pop (L, 1);

	} else { // Get

		LmProxy *proxy = lm_connection_get_proxy (object->connection);

		lua_pop (L, 1);

		if (proxy) {

			bless_lm_proxy (L, proxy);

			// XXX lm_proxy_unref (proxy);

		} else

			lua_pushnil (L);

	}

	return 1;

}

/// connection:ssl

/// Gets or sets ssl object for connection.

/// A: lm ssl object (optional)

/// R: lm ssl object or nil (when called with no args) or lm connection object

static int ssl_lm_connection (lua_State *L)

{

	llm_connection_t *object = luaL_checklm_connection (L, 1);

	if (lua_gettop (L) > 1) { // Set

		llm_ssl_t *ssl = luaL_checklm_ssl (L, 2);

		lm_connection_set_ssl (object->connection, ssl->ssl);

		lua_pop (L, 1);

	} else { // Get

		LmSSL *ssl = lm_connection_get_ssl (object->connection);

		lua_pop (L, 1);

		if (ssl) {

			bless_lm_ssl (L, ssl);

			// XXX lm_ssl_unref (ssl);

		} else

			lua_pushnil (L);

	}

	return 1;

}

/// connection:close

/// Close connection.

/// R: lm connection object or nil, string (error message)

static int close_lm_connection (lua_State *L)

{

	llm_connection_t *object = luaL_checklm_connection (L, 1);

	GError *err = NULL;

	if (lm_connection_close (object->connection, &err))

		return 1;

	else {

		I ("Connection close failed: %s", err->message);

		lua_pushnil (L);

		lua_pushstring (L, err->message);

		g_error_free (err);

		return 2;

	}

}

/// connection:status

/// Returns string, describing connection state.

/// R: connection state

static int status_lm_connection (lua_State *L)

{

	llm_connection_t *connection = luaL_checklm_connection (L, 1);

	luaL_pushenum (L, lm_connection_get_state (connection->connection), state_lm_connection);

	return 1;

}

/// connection:send

/// Sends message. If specified, handler function will be called upon receiving of response to this message.

/// Handler function can be either a message handler object or just a message handler function.

/// Message can be raw xml string. However, you cannot use it with handler function.

/// In short:

/// * connection, errmsg = connection:send ( "raw xml" )

/// * connection, errmsg = connection:send ( message )

/// * connection, errmsg = connection:send ( message, function ( connection, message ) end )

/// * connection, errmsg = connection:send ( message, handler )

/// If connection is nil, errmsg contains error message.

/// A: lm message object/string, message handler callback function/lm message handler object (optional)

/// R: lm connection object or nil, string (error message)

static int send_lm_connection (lua_State *L)

{

	llm_connection_t *object = luaL_checklm_connection (L, 1);

	int status;

	GError *err = NULL;

	if (lua_gettop (L) < 3) { // Send

		if (lua_type (L, 2) == LUA_TSTRING)

			status = lm_connection_send_raw (object->connection, lua_tostring (L, 2), &err);

		else {

			llm_message_t *message = luaL_checklm_message (L, 2);

			status = lm_connection_send (object->connection, message->message, &err);

		}

	} else if (lua_isfunction (L, 3)) { // Send w/reply, func

		llm_message_t    *message = luaL_checklm_message (L, 2);

		llm_callback_t   *cb      = luaL_malloc (L, sizeof (llm_callback_t));

		LmMessageHandler *handler;

		cb->reference = luaL_ref (L, LUA_REGISTRYINDEX);

		cb->L         = L;

		handler = lm_message_handler_new (

					(LmHandleMessageFunction)callback_lm_handler,

					cb, (GDestroyNotify)llm_callback_destroy);

		status = lm_connection_send_with_reply (object->connection,

							message->message, handler, &err);

		lm_message_handler_unref (handler);

	} else { // Send w/reply, handler

		llm_message_t *message = luaL_checklm_message (L, 2);

		llm_handler_t *handler = luaL_checklm_handler (L, 3);

		status = lm_connection_send_with_reply (object->connection, message->message,

							handler->handler, &err);

		lua_pop (L, 1);

	};

	lua_pop (L, 1);

	if (status)

		return 1;

	else {

		I ("Message sending failed: %s", err->message);

		lua_pushnil (L);

		lua_pushstring (L, err->message);

		g_error_free (err);

		return 2;

	}

}

/// connection:handler

/// Registers or unregisters handler function for a given type of messages.

/// To unregister handler, omit the priority argument.

/// To unregister reply handler, omit message type argument too.

/// Handler function can be specified as plain function or message handler object.

/// A: message handler callback function or lm message handler object, message type (optional), handler priority (optional)

/// R: lm connection object

static int handler_lm_connection (lua_State *L)

{

	llm_connection_t *object = luaL_checklm_connection (L, 1);

	int top  = lua_gettop (L);

	if (top > 2) { // Have message type