/*
  control.c

  $Id: control.c 517 2003-04-03 17:21:24Z bears $
*/

#if HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdio.h>
#include "common.h"
#include "content.h"
#include "control.h"
#include "database.h"
#include "group.h"
#include "itemlist.h"
#include "log.h"
#include "outgoing.h"
#include "portable.h"

int
Ctrl_cancel( const char *msgId )
{
    ItemList *refs;
    const char *ref;
    Str server;
    Bool inOutgoing = FALSE;
    int res = CANCEL_OK;
    Bool removeFromDb = TRUE;

    /* See if in outgoing and zap if so. */
    if ( Out_find( msgId, server ) )
    {
	Out_remove( server, msgId );
	Log_dbg( LOG_DBG_CONTROL,
		 "'%s' cancelled from outgoing queue for '%s'.\n",
		 msgId, server );
	inOutgoing = TRUE;
    }

    if ( ! Db_contains( msgId ) )
    {
	Log_dbg( LOG_DBG_CONTROL, "Cancel: '%s' not in database.", msgId );
	return inOutgoing ? CANCEL_OK : CANCEL_NO_SUCH_MSG;
    }

    /*
      Retrieve the Xrefs, remove from each group and then
      remove from the database.
     */
    refs = new_Itl( Db_xref( msgId ), " " );
    for( ref = Itl_first( refs ); ref != NULL; ref = Itl_next( refs ) )
    {
	Str grp;
	int no;

	if ( sscanf( ref, "%"MAXCHAR_STR"[^:]:%d", grp, &no ) != 2 )
	    break;
	
	if ( Grp_exists( grp ) )
	{
	    Cont_read( grp );
	    Cont_delete( no );
            /*
             * If we don't manage to remove the overview, leave the message
             * in the main database to avoid confusion. Yes, the message
             * will not be cancelled properly for this group but we don't
             * signal this to the calling routine.
             */
	    if ( Cont_write() )
                Log_dbg( LOG_DBG_CONTROL,
                         "Removed '%s' from group '%s'.",
                         msgId, grp );
            else
                removeFromDb = FALSE;

	    if ( ! Grp_local( grp ) && ! inOutgoing )
		res = CANCEL_NEEDS_MSG;
	}
	else
	{
	    Log_dbg( LOG_DBG_CONTROL,
		     "Group '%s' in Xref for '%s' not found.", grp, msgId );
	}
    }
    del_Itl( refs );
    if ( removeFromDb )
        Db_delete( msgId );
    Log_dbg( LOG_DBG_CONTROL, "Message '%s' cancelled%s.", msgId,
	     (res == CANCEL_NEEDS_MSG) ? ", needs cancelling upstream" : "" );
    return res;
}