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/**
* Enable or disable location streaming for a chat.
* Locations are sent to all members of the chat for the given number of seconds;
* after that, location streaming is automatically disabled for the chat.
* The current location streaming state of a chat
* can be checked using dc_is_sending_locations_to_chat().
*
* The locations that should be sent to the chat can be set using
* dc_set_location().
*
* @memberof dc_context_t
* @param context The context object.
* @param chat_id Chat id to enable location streaming for.
* @param seconds >0: enable location streaming for the given number of seconds;
* 0: disable location streaming.
* @return None.
*/
void dc_send_locations_to_chat(dc_context_t* context, uint32_t chat_id,
int seconds)
{
sqlite3_stmt* stmt = NULL;
time_t now = time(NULL);
dc_msg_t* msg = NULL;
char* stock_str = NULL;
int is_sending_locations_before = 0;
if (context==NULL || context->magic!=DC_CONTEXT_MAGIC || seconds<0
|| chat_id<=DC_CHAT_ID_LAST_SPECIAL) {
goto cleanup;
}
is_sending_locations_before = dc_is_sending_locations_to_chat(context, chat_id);
stmt = dc_sqlite3_prepare(context->sql,
"UPDATE chats "
" SET locations_send_begin=?, "
" locations_send_until=? "
" WHERE id=?");
sqlite3_bind_int64(stmt, 1, seconds? now : 0);
sqlite3_bind_int64(stmt, 2, seconds? now+seconds : 0);
sqlite3_bind_int (stmt, 3, chat_id);
sqlite3_step(stmt);
// add/sent status message.
// as disable also happens after a timeout, this is not sent explicitly.
if (seconds && !is_sending_locations_before) {
msg = dc_msg_new(context, DC_MSG_TEXT);
msg->text = dc_stock_system_msg(context, DC_STR_MSGLOCATIONENABLED, NULL, NULL, 0);
dc_param_set_int(msg->param, DC_PARAM_CMD, DC_CMD_LOCATION_STREAMING_ENABLED);
dc_send_msg(context, chat_id, msg);
}
else if(!seconds && is_sending_locations_before) {
stock_str = dc_stock_system_msg(context, DC_STR_MSGLOCATIONDISABLED, NULL, NULL, 0);
dc_add_device_msg(context, chat_id, stock_str);
}
// update eg. the "location-sending"-icon
context->cb(context, DC_EVENT_CHAT_MODIFIED, chat_id, 0);
if (seconds) {
schedule_MAYBE_SEND_LOCATIONS(context, 0);
dc_job_add(context, DC_JOB_MAYBE_SEND_LOC_ENDED, chat_id, NULL, seconds+1);
}
cleanup:
free(stock_str);
dc_msg_unref(msg);
sqlite3_finalize(stmt);
}
/**
* Check if location streaming is enabled.
* Location stream can be enabled or disabled using dc_send_locations_to_chat().
* If you have already a dc_chat_t object,
* dc_chat_is_sending_locations() may be more handy.
*
* @memberof dc_context_t
* @param context The context object.
* @param chat_id >0: Check if location streaming is enabled for the given chat.
* 0: Check of location streaming is enabled for any chat.
* @return 1: location streaming is enabled for the given chat(s);
* 0: location streaming is disabled for the given chat(s).
*/
int dc_is_sending_locations_to_chat(dc_context_t* context, uint32_t chat_id)
{
int is_sending_locations = 0;
sqlite3_stmt* stmt = NULL;
if (context==NULL || context->magic!=DC_CONTEXT_MAGIC) {
goto cleanup;
}
stmt = dc_sqlite3_prepare(context->sql,
"SELECT id "
" FROM chats "
" WHERE (? OR id=?)"
" AND locations_send_until>?;");