path: root/camel/camel-vee-folder.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 *  Copyright (C) 2000-2003 Ximian Inc.
 *
 *  Authors: Michael Zucchi <notzed@ximian.com>
 *           Jeffrey Stedfast <fejj@ximian.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * 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, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

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

#include <string.h>
#include <pthread.h>

#include "camel-exception.h"
#include "camel-vee-folder.h"
#include "camel-store.h"
#include "camel-folder-summary.h"
#include "camel-mime-message.h"
#include "camel-folder-search.h"

#include "camel-session.h"
#include "camel-vee-store.h"    /* for open flags */
#include "camel-private.h"

#include "e-util/md5-utils.h"

#if defined (DOEPOOLV) || defined (DOESTRV)
#include "e-util/e-memory.h"
#endif

#define d(x)
extern int camel_verbose_debug;
#define dd(x) (camel_verbose_debug?(x):0)

#define _PRIVATE(o) (((CamelVeeFolder *)(o))->priv)

static void vee_refresh_info(CamelFolder *folder, CamelException *ex);

static void vee_sync (CamelFolder *folder, gboolean expunge, CamelException *ex);
static void vee_expunge (CamelFolder *folder, CamelException *ex);

static void vee_freeze (CamelFolder *folder);
static void vee_thaw (CamelFolder *folder);

static CamelMimeMessage *vee_get_message (CamelFolder *folder, const gchar *uid, CamelException *ex);
static void vee_append_message(CamelFolder *folder, CamelMimeMessage *message, const CamelMessageInfo *info, char **appended_uid, CamelException *ex);
static void vee_transfer_messages_to(CamelFolder *source, GPtrArray *uids, CamelFolder *dest, GPtrArray **transferred_uids, gboolean delete_originals, CamelException *ex);

static GPtrArray *vee_search_by_expression(CamelFolder *folder, const char *expression, CamelException *ex);
static GPtrArray *vee_search_by_uids(CamelFolder *folder, const char *expression, GPtrArray *uids, CamelException *ex);

static gboolean vee_set_message_flags (CamelFolder *folder, const char *uid, guint32 flags, guint32 set);
static void vee_set_message_user_flag (CamelFolder *folder, const char *uid, const char *name, gboolean value);
static void vee_set_message_user_tag(CamelFolder *folder, const char *uid, const char *name, const char *value);
static void vee_rename(CamelFolder *folder, const char *new);

static void camel_vee_folder_class_init (CamelVeeFolderClass *klass);
static void camel_vee_folder_init       (CamelVeeFolder *obj);
static void camel_vee_folder_finalise   (CamelObject *obj);

static int vee_folder_build_folder(CamelVeeFolder *vf, CamelFolder *source, CamelException *ex);
static void vee_folder_remove_folder(CamelVeeFolder *vf, CamelFolder *source, int killun);

static void message_changed(CamelFolder *f, const char *uid, CamelVeeFolder *vf);
static void folder_changed(CamelFolder *sub, CamelFolderChangeInfo *changes, CamelVeeFolder *vf);
static void subfolder_deleted(CamelFolder *f, void *event_data, CamelVeeFolder *vf);

static void folder_changed_remove_uid(CamelFolder *sub, const char *uid, const char hash[8], int keep, CamelVeeFolder *vf);

static CamelFolderClass *camel_vee_folder_parent;

/* a vfolder for unmatched messages */
/* use folder_unmatched->summary_lock for access to unmatched_uids or appropriate internals, for consistency */
static CamelVeeFolder *folder_unmatched;
static GHashTable *unmatched_uids; /* a refcount of uid's that are matched by any rules */
static pthread_mutex_t unmatched_lock = PTHREAD_MUTEX_INITIALIZER;
/* only used to initialise folder_unmatched */
#define UNMATCHED_LOCK() pthread_mutex_lock(&unmatched_lock)
#define UNMATCHED_UNLOCK() pthread_mutex_unlock(&unmatched_lock)


CamelType
camel_vee_folder_get_type (void)
{
    static CamelType type = CAMEL_INVALID_TYPE;
    
    if (type == CAMEL_INVALID_TYPE) {
        type = camel_type_register (camel_folder_get_type (), "CamelVeeFolder",
                        sizeof (CamelVeeFolder),
                        sizeof (CamelVeeFolderClass),
                        (CamelObjectClassInitFunc) camel_vee_folder_class_init,
                        NULL,
                        (CamelObjectInitFunc) camel_vee_folder_init,
                        (CamelObjectFinalizeFunc) camel_vee_folder_finalise);
    }
    
    return type;
}

static void
camel_vee_folder_class_init (CamelVeeFolderClass *klass)
{
    CamelFolderClass *folder_class = (CamelFolderClass *) klass;

    camel_vee_folder_parent = CAMEL_FOLDER_CLASS(camel_type_get_global_classfuncs (camel_folder_get_type ()));

    folder_class->refresh_info = vee_refresh_info;
    folder_class->sync = vee_sync;
    folder_class->expunge = vee_expunge;

    folder_class->get_message = vee_get_message;
    folder_class->append_message = vee_append_message;
    folder_class->transfer_messages_to = vee_transfer_messages_to;

    folder_class->search_by_expression = vee_search_by_expression;
    folder_class->search_by_uids = vee_search_by_uids;

    folder_class->set_message_flags = vee_set_message_flags;
    folder_class->set_message_user_flag = vee_set_message_user_flag;
    folder_class->set_message_user_tag = vee_set_message_user_tag;

    folder_class->rename = vee_rename;

    folder_class->freeze = vee_freeze;
    folder_class->thaw = vee_thaw;
}

static void
camel_vee_folder_init (CamelVeeFolder *obj)
{
    struct _CamelVeeFolderPrivate *p;
    CamelFolder *folder = (CamelFolder *)obj;

    p = _PRIVATE(obj) = g_malloc0(sizeof(*p));

    folder->folder_flags |= (CAMEL_FOLDER_HAS_SUMMARY_CAPABILITY |
                 CAMEL_FOLDER_HAS_SEARCH_CAPABILITY);

    /* FIXME: what to do about user flags if the subfolder doesn't support them? */
    folder->permanent_flags = CAMEL_MESSAGE_ANSWERED |
        CAMEL_MESSAGE_DELETED |
        CAMEL_MESSAGE_DRAFT |
        CAMEL_MESSAGE_FLAGGED |
        CAMEL_MESSAGE_SEEN;

    obj->changes = camel_folder_change_info_new();
    obj->search = camel_folder_search_new();
    
    p->summary_lock = g_mutex_new();
    p->subfolder_lock = g_mutex_new();
    p->changed_lock = g_mutex_new();
}

static void
camel_vee_folder_finalise (CamelObject *obj)
{
    CamelVeeFolder *vf = (CamelVeeFolder *)obj;
    struct _CamelVeeFolderPrivate *p = _PRIVATE(vf);
    GList *node;

    /* FIXME: check leaks */
    node = p->folders;
    while (node) {
        CamelFolder *f = node->data;

        if (vf != folder_unmatched) {
            camel_object_unhook_event((CamelObject *)f, "folder_changed", (CamelObjectEventHookFunc) folder_changed, vf);
            camel_object_unhook_event((CamelObject *)f, "message_changed", (CamelObjectEventHookFunc) message_changed, vf);
            camel_object_unhook_event((CamelObject *)f, "deleted", (CamelObjectEventHookFunc) subfolder_deleted, vf);
            /* this updates the vfolder */
            if ((vf->flags & CAMEL_STORE_FOLDER_PRIVATE) == 0)
                vee_folder_remove_folder(vf, f, FALSE);
        }
        camel_object_unref((CamelObject *)f);

        node = g_list_next(node);
    }

    g_free(vf->expression);
    g_free(vf->vname);
    
    g_list_free(p->folders);
    g_list_free(p->folders_changed);

    camel_folder_change_info_free(vf->changes);
    camel_object_unref((CamelObject *)vf->search);
    
    g_mutex_free(p->summary_lock);
    g_mutex_free(p->subfolder_lock);
    g_mutex_free(p->changed_lock);
    
    g_free(p);
}

static void
vee_folder_construct (CamelVeeFolder *vf, CamelStore *parent_store, const char *name, guint32 flags)
{
    CamelFolder *folder = (CamelFolder *)vf;
    char *tmp;
    
    vf->flags = flags;
    vf->vname = g_strdup(name);
    tmp = strrchr(vf->vname, '/');
    if (tmp)
        tmp++;
    else
        tmp = vf->vname;
    camel_folder_construct(folder, parent_store, vf->vname, tmp);

    /* should CamelVeeMessageInfo be subclassable ..? */
    folder->summary = camel_folder_summary_new();
    folder->summary->message_info_size = sizeof(CamelVeeMessageInfo);
}

void
camel_vee_folder_construct(CamelVeeFolder *vf, CamelStore *parent_store, const char *name, guint32 flags)
{
    UNMATCHED_LOCK();
    
    /* setup unmatched folder if we haven't yet */
    if (folder_unmatched == NULL) {
        unmatched_uids = g_hash_table_new (g_str_hash, g_str_equal);
        folder_unmatched = (CamelVeeFolder *)camel_object_new (camel_vee_folder_get_type ());
        d(printf("created foldeer unmatched %p\n", folder_unmatched));
        
        vee_folder_construct (folder_unmatched, parent_store, CAMEL_UNMATCHED_NAME, CAMEL_STORE_FOLDER_PRIVATE);
    }
    
    UNMATCHED_UNLOCK();
    
    vee_folder_construct (vf, parent_store, name, flags);
}

/**
 * camel_vee_folder_new:
 * @parent_store: the parent CamelVeeStore
 * @name: the vfolder name
 * @ex: a CamelException
 *
 * Create a new CamelVeeFolder object.
 *
 * Return value: A new CamelVeeFolder widget.
 **/
CamelFolder *
camel_vee_folder_new(CamelStore *parent_store, const char *name, guint32 flags)
{
    CamelVeeFolder *vf;

    UNMATCHED_LOCK();

    /* setup unmatched folder if we haven't yet */
    if (folder_unmatched == NULL) {
        unmatched_uids = g_hash_table_new(g_str_hash, g_str_equal);
        folder_unmatched = vf = (CamelVeeFolder *)camel_object_new(camel_vee_folder_get_type());
        d(printf("created foldeer unmatched %p\n", folder_unmatched));
        vee_folder_construct (vf, parent_store, CAMEL_UNMATCHED_NAME, CAMEL_STORE_FOLDER_PRIVATE);
    }

    UNMATCHED_UNLOCK();

    if (strcmp(name, CAMEL_UNMATCHED_NAME) == 0) {
        camel_object_ref((CamelObject *)folder_unmatched);
        d(printf("returning unmatched %p, count = %d\n", folder_unmatched, camel_folder_get_message_count((CamelFolder *)folder_unmatched)));
        return (CamelFolder *)folder_unmatched;
    }

    vf = (CamelVeeFolder *)camel_object_new(camel_vee_folder_get_type());
    vee_folder_construct(vf, parent_store, name, flags);

    d(printf("returning folder %s %p, count = %d\n", name, vf, camel_folder_get_message_count((CamelFolder *)vf)));

    return (CamelFolder *)vf;
}

void
camel_vee_folder_set_expression(CamelVeeFolder *vf, const char *query)
{
    struct _CamelVeeFolderPrivate *p = _PRIVATE(vf);
    GList *node;

    CAMEL_VEE_FOLDER_LOCK(vf, subfolder_lock);

    /* no change, do nothing */
    if ((vf->expression && query && strcmp(vf->expression, query) == 0)
        || (vf->expression == NULL && query == NULL)) {
        CAMEL_VEE_FOLDER_UNLOCK(vf, subfolder_lock);
        return;
    }

    g_free(vf->expression);
    if (query)
        vf->expression = g_strdup(query);

    node = p->folders;
    while (node) {
        CamelFolder *f = node->data;

        if (vee_folder_build_folder(vf, f, NULL) == -1)
            break;

        node = node->next;
    }

    CAMEL_VEE_FOLDER_LOCK(vf, changed_lock);
    g_list_free(p->folders_changed);
    p->folders_changed = NULL;
    CAMEL_VEE_FOLDER_UNLOCK(vf, changed_lock);

    CAMEL_VEE_FOLDER_UNLOCK(vf, subfolder_lock);
}

/**
 * camel_vee_folder_add_folder:
 * @vf: Virtual Folder object
 * @sub: source CamelFolder to add to @vf
 *
 * Adds @sub as a source folder to @vf.
 **/
void
camel_vee_folder_add_folder(CamelVeeFolder *vf, CamelFolder *sub)
{
    struct _CamelVeeFolderPrivate *p = _PRIVATE(vf), *up = _PRIVATE(folder_unmatched);
    int i;
    
    if (vf == (CamelVeeFolder *)sub) {
        g_warning("Adding a virtual folder to itself as source, ignored");
        return;
    }

    CAMEL_VEE_FOLDER_LOCK(vf, subfolder_lock);

    /* for normal vfolders we want only unique ones, for unmatched we want them all recorded */
    if (g_list_find(p->folders, sub) == NULL) {
        camel_object_ref((CamelObject *)sub);
        p->folders = g_list_append(p->folders, sub);
        
        /* update the freeze state of 'sub' to match our freeze state */
        for (i = 0; i < p->freeze_count; i++)
            camel_folder_freeze (sub);
    }
    if ((vf->flags & CAMEL_STORE_FOLDER_PRIVATE) == 0 && !CAMEL_IS_VEE_FOLDER(sub)) {
        camel_object_ref((CamelObject *)sub);
        up->folders = g_list_append(up->folders, sub);
        /* update the freeze state of 'sub' to match Unmatched's freeze state */
        for (i = 0; i < up->freeze_count; i++)
            camel_folder_freeze (sub);
    }

    CAMEL_VEE_FOLDER_UNLOCK(vf, subfolder_lock);

    d(printf("camel_vee_folder_add_folde(%p, %p)\n", vf, sub));

    camel_object_hook_event((CamelObject *)sub, "folder_changed", (CamelObjectEventHookFunc)folder_changed, vf);
    camel_object_hook_event((CamelObject *)sub, "message_changed", (CamelObjectEventHookFunc)message_changed, vf);
    camel_object_hook_event((CamelObject *)sub, "deleted", (CamelObjectEventHookFunc)subfolder_deleted, vf);

    vee_folder_build_folder(vf, sub, NULL);
}

/**
 * camel_vee_folder_remove_folder:
 * @vf: Virtual Folder object
 * @sub: source CamelFolder to remove from @vf
 *
 * Removed the source folder, @sub, from the virtual folder, @vf.
 **/
void
camel_vee_folder_remove_folder(CamelVeeFolder *vf, CamelFolder *sub)
{
    struct _CamelVeeFolderPrivate *p = _PRIVATE(vf), *up = _PRIVATE(folder_unmatched);
    int killun = FALSE;
    int i;
    
    CAMEL_VEE_FOLDER_LOCK(vf, subfolder_lock);

    CAMEL_VEE_FOLDER_LOCK(vf, changed_lock);
    p->folders_changed = g_list_remove(p->folders_changed, sub);
    CAMEL_VEE_FOLDER_UNLOCK(vf, changed_lock);

    if (g_list_find(p->folders, sub) == NULL) {
        CAMEL_VEE_FOLDER_UNLOCK(vf, subfolder_lock);
        return;
    }
    
    camel_object_unhook_event((CamelObject *)sub, "folder_changed", (CamelObjectEventHookFunc) folder_changed, vf);
    camel_object_unhook_event((CamelObject *)sub, "message_changed", (CamelObjectEventHookFunc) message_changed, vf);
    camel_object_unhook_event((CamelObject *)sub, "deleted", (CamelObjectEventHookFunc) subfolder_deleted, vf);

    p->folders = g_list_remove(p->folders, sub);
    
    /* undo the freeze state that we have imposed on this source folder */
    for (i = 0; i < p->freeze_count; i++)
        camel_folder_thaw (sub);
    
    CAMEL_VEE_FOLDER_UNLOCK(vf, subfolder_lock);

    CAMEL_VEE_FOLDER_LOCK(folder_unmatched, subfolder_lock);
    /* if folder deleted, then blow it away from unmatched always, and remove all refs to it */
    if (sub->folder_flags & CAMEL_FOLDER_HAS_BEEN_DELETED) {
        while (g_list_find(up->folders, sub)) {
            killun = TRUE;
            up->folders = g_list_remove(up->folders, sub);
            camel_object_unref((CamelObject *)sub);
            
            /* undo the freeze state that Unmatched has imposed on this source folder */
            for (i = 0; i < up->freeze_count; i++)
                camel_folder_thaw (sub);
        }
    } else if ((vf->flags & CAMEL_STORE_FOLDER_PRIVATE) == 0) {
        if (g_list_find(up->folders, sub) != NULL) {
            up->folders = g_list_remove(up->folders, sub);
            camel_object_unref((CamelObject *)sub);
            
            /* undo the freeze state that Unmatched has imposed on this source folder */
            for (i = 0; i < up->freeze_count; i++)
                camel_folder_thaw (sub);
        }
        if (g_list_find(up->folders, sub) == NULL) {
            killun = TRUE;
        }
    }
    CAMEL_VEE_FOLDER_UNLOCK(folder_unmatched, subfolder_lock);

    vee_folder_remove_folder(vf, sub, killun);

    camel_object_unref((CamelObject *)sub);
}

static void
remove_folders(CamelFolder *folder, CamelFolder *foldercopy, CamelVeeFolder *vf)
{
    camel_vee_folder_remove_folder(vf, folder);
    camel_object_unref((CamelObject *)folder);
}

/**
 * camel_vee_folder_set_folders:
 * @vf: 
 * @folders: 
 * 
 * Set the whole list of folder sources on a vee folder.
 **/
void
camel_vee_folder_set_folders(CamelVeeFolder *vf, GList *folders)
{
    struct _CamelVeeFolderPrivate *p = _PRIVATE(vf);
    GHashTable *remove = g_hash_table_new(NULL, NULL);
    GList *l;
    CamelFolder *folder;
    int changed;

    /* setup a table of all folders we have currently */
    CAMEL_VEE_FOLDER_LOCK(vf, subfolder_lock);
    l = p->folders;
    while (l) {
        g_hash_table_insert(remove, l->data, l->data);
        camel_object_ref((CamelObject *)l->data);
        l = l->next;
    }
    CAMEL_VEE_FOLDER_UNLOCK(vf, subfolder_lock);

    /* if we already have the folder, ignore it, otherwise add it */
    l = folders;
    while (l) {
        if ((folder = g_hash_table_lookup(remove, l->data))) {
            g_hash_table_remove(remove, folder);
            camel_object_unref((CamelObject *)folder);

            /* if this was a changed folder, re-update it while we're here */
            CAMEL_VEE_FOLDER_LOCK(vf, changed_lock);
            changed = g_list_find(p->folders_changed, folder) != NULL;
            if (changed)
                p->folders_changed = g_list_remove(p->folders_changed, folder);
            CAMEL_VEE_FOLDER_UNLOCK(vf, changed_lock);
            if (changed)
                vee_folder_build_folder(vf, folder, NULL);
        } else {
            camel_vee_folder_add_folder(vf, l->data);
        }
        l = l->next;
    }

    /* then remove any we still have */
    g_hash_table_foreach(remove, (GHFunc)remove_folders, vf);
    g_hash_table_destroy(remove);
}

/**
 * camel_vee_folder_hash_folder:
 * @folder: 
 * @: 
 * 
 * Create a hash string representing the folder name, which should be
 * unique, and remain static for a given folder.
 **/
void
camel_vee_folder_hash_folder(CamelFolder *folder, char buffer[8])
{
    MD5Context ctx;
    unsigned char digest[16];
    unsigned int state = 0, save = 0;
    char *tmp;
    int i;

    md5_init(&ctx);
    tmp = camel_service_get_url((CamelService *)folder->parent_store);
    md5_update(&ctx, tmp, strlen(tmp));
    g_free(tmp);
    md5_update(&ctx, folder->full_name, strlen(folder->full_name));
    md5_final(&ctx, digest);
    camel_base64_encode_close(digest, 6, FALSE, buffer, &state, &save);

    for (i=0;i<8;i++) {
        if (buffer[i] == '+')
            buffer[i] = '.';
        if (buffer[i] == '/')
            buffer[i] = '_';
    }
}

/**
 * camel_vee_folder_get_location:
 * @vf: 
 * @vinfo: 
 * @realuid: if not NULL, set to the uid of the real message, must be
 * g_free'd by caller.
 * 
 * Find the real folder (and uid)
 * 
 * Return value: 
 **/
CamelFolder *
camel_vee_folder_get_location(CamelVeeFolder *vf, const CamelVeeMessageInfo *vinfo, char **realuid)
{
    /* locking?  yes?  no?  although the vfolderinfo is valid when obtained
       the folder in it might not necessarily be so ...? */
    if (CAMEL_IS_VEE_FOLDER(vinfo->folder)) {
        CamelFolder *folder;
        const CamelVeeMessageInfo *vfinfo;

        vfinfo = (CamelVeeMessageInfo *)camel_folder_get_message_info(vinfo->folder, camel_message_info_uid(vinfo)+8);
        folder = camel_vee_folder_get_location((CamelVeeFolder *)vinfo->folder, vfinfo, realuid);
        camel_folder_free_message_info(vinfo->folder, (CamelMessageInfo *)vfinfo);
        return folder;
    } else {
        if (realuid)
            *realuid = g_strdup(camel_message_info_uid(vinfo)+8);

        return vinfo->folder;
    }
}

static void vee_refresh_info(CamelFolder *folder, CamelException *ex)
{
    CamelVeeFolder *vf = (CamelVeeFolder *)folder;
    struct _CamelVeeFolderPrivate *p = _PRIVATE(vf);
    GList *node, *list;

    CAMEL_VEE_FOLDER_LOCK(vf, changed_lock);
    list = p->folders_changed;
    p->folders_changed = NULL;
    CAMEL_VEE_FOLDER_UNLOCK(vf, changed_lock);

    node = list;
    while (node) {
        CamelFolder *f = node->data;

        if (vee_folder_build_folder(vf, f, ex) == -1)
            break;

        node = node->next;
    }

    g_list_free(list);
}

static void
vee_sync(CamelFolder *folder, gboolean expunge, CamelException *ex)
{
    CamelVeeFolder *vf = (CamelVeeFolder *)folder;
    struct _CamelVeeFolderPrivate *p = _PRIVATE(vf);
    GList *node;

    CAMEL_VEE_FOLDER_LOCK(vf, subfolder_lock);

    node = p->folders;
    while (node) {
        CamelFolder *f = node->data;

        camel_folder_sync(f, expunge, ex);
        if (camel_exception_is_set(ex)) {
            char *desc;

            camel_object_get(f, NULL, CAMEL_OBJECT_DESCRIPTION, &desc, NULL);
            camel_exception_setv(ex, ex->id, _("Error storing `%s': %s"), desc, ex->desc);
            break;
        }

        if (vee_folder_build_folder(vf, f, ex) == -1)
            break;

        node = node->next;
    }

    if (node == NULL) {
        CAMEL_VEE_FOLDER_LOCK(vf, changed_lock);
        g_list_free(p->folders_changed);
        p->folders_changed = NULL;
        CAMEL_VEE_FOLDER_UNLOCK(vf, changed_lock);
    }

    CAMEL_VEE_FOLDER_UNLOCK(vf, subfolder_lock);
}

static void
vee_expunge (CamelFolder *folder, CamelException *ex)
{
    ((CamelFolderClass *)((CamelObject *)folder)->klass)->sync(folder, TRUE, ex);
}

static CamelMimeMessage *
vee_get_message(CamelFolder *folder, const char *uid, CamelException *ex)
{
    CamelVeeMessageInfo *mi;
    CamelMimeMessage *msg = NULL;

    mi = (CamelVeeMessageInfo *)camel_folder_summary_uid(folder->summary, uid);
    if (mi) {
        msg =  camel_folder_get_message(mi->folder, camel_message_info_uid(mi)+8, ex);
        camel_folder_summary_info_free(folder->summary, (CamelMessageInfo *)mi);
    } else {
        camel_exception_setv(ex, CAMEL_EXCEPTION_FOLDER_INVALID_UID,
                     _("No such message %s in %s"), uid,
                     folder->name);
    }

    return msg;
}

static GPtrArray *
vee_search_by_expression(CamelFolder *folder, const char *expression, CamelException *ex)
{
    GList *node;
    GPtrArray *matches, *result = g_ptr_array_new ();
    char *expr;
    CamelVeeFolder *vf = (CamelVeeFolder *)folder;
    struct _CamelVeeFolderPrivate *p = _PRIVATE(vf);
    GHashTable *searched = g_hash_table_new(NULL, NULL);
    
    CAMEL_VEE_FOLDER_LOCK(vf, subfolder_lock);
    
    if (vf != folder_unmatched)
        expr = g_strdup_printf ("(and %s %s)", vf->expression, expression);
    else
        expr = g_strdup (expression);
    
    node = p->folders;
    while (node) {
        CamelFolder *f = node->data;
        int i;
        char hash[8];
        
        /* make sure we only search each folder once - for unmatched folder to work right */
        if (g_hash_table_lookup(searched, f) == NULL) {
            camel_vee_folder_hash_folder(f, hash);
            /* FIXME: shouldn't ignore search exception */
            matches = camel_folder_search_by_expression(f, expression, NULL);
            if (matches) {
                for (i = 0; i < matches->len; i++) {
                    char *uid = matches->pdata[i], *vuid;

                    vuid = g_malloc(strlen(uid)+9);
                    memcpy(vuid, hash, 8);
                    strcpy(vuid+8, uid);
                    g_ptr_array_add(result, vuid);
                }
                camel_folder_search_free(f, matches);
            }
            g_hash_table_insert(searched, f, f);
        }
        node = g_list_next(node);
    }

    g_free(expr);
    CAMEL_VEE_FOLDER_UNLOCK(vf, subfolder_lock);

    g_hash_table_destroy(searched);

    return result;
}

static GPtrArray *
vee_search_by_uids(CamelFolder *folder, const char *expression, GPtrArray *uids, CamelException *ex)
{
    GList *node;
    GPtrArray *matches, *result = g_ptr_array_new ();
    GPtrArray *folder_uids = g_ptr_array_new();
    char *expr;
    CamelVeeFolder *vf = (CamelVeeFolder *)folder;
    struct _CamelVeeFolderPrivate *p = _PRIVATE(vf);
    GHashTable *searched = g_hash_table_new(NULL, NULL);

    CAMEL_VEE_FOLDER_LOCK(vf, subfolder_lock);

    expr = g_strdup_printf("(and %s %s)", vf->expression, expression);
    node = p->folders;
    while (node) {
        CamelFolder *f = node->data;
        int i;
        char hash[8];
        
        /* make sure we only search each folder once - for unmatched folder to work right */
        if (g_hash_table_lookup(searched, f) == NULL) {
            camel_vee_folder_hash_folder(f, hash);

            /* map the vfolder uid's to the source folder uid's first */
            g_ptr_array_set_size(folder_uids, 0);
            for (i=0;i<uids->len;i++) {
                char *uid = uids->pdata[i];

                if (strlen(uid) >= 8 && strncmp(uid, hash, 8) == 0)
                    g_ptr_array_add(folder_uids, uid+8);
            }
            if (folder_uids->len > 0) {
                matches = camel_folder_search_by_uids(f, expression, folder_uids, ex);
                if (matches) {
                    for (i = 0; i < matches->len; i++) {
                        char *uid = matches->pdata[i], *vuid;
                
                        vuid = g_malloc(strlen(uid)+9);
                        memcpy(vuid, hash, 8);
                        strcpy(vuid+8, uid);
                        g_ptr_array_add(result, vuid);
                    }
                    camel_folder_search_free(f, matches);
                } else {
                    g_warning("Search failed: %s", camel_exception_get_description(ex));
                }
            }
            g_hash_table_insert(searched, f, f);
        }
        node = g_list_next(node);
    }

    g_free(expr);
    CAMEL_VEE_FOLDER_UNLOCK(vf, subfolder_lock);

    g_hash_table_destroy(searched);
    g_ptr_array_free(folder_uids, 0);

    return result;
}

static gboolean
vee_set_message_flags(CamelFolder *folder, const char *uid, guint32 flags, guint32 set)
{
    CamelVeeMessageInfo *mi;
    int res = FALSE;

    mi = (CamelVeeMessageInfo *)camel_folder_summary_uid(folder->summary, uid);
    if (mi) {
        res = camel_folder_set_message_flags(mi->folder, camel_message_info_uid(mi) + 8, flags, set);
        camel_folder_summary_info_free(folder->summary, (CamelMessageInfo *)mi);
        res = res || ((CamelFolderClass *)camel_vee_folder_parent)->set_message_flags(folder, uid, flags, set);
    }

    return res;
}

static void
vee_set_message_user_flag(CamelFolder *folder, const char *uid, const char *name, gboolean value)
{
    CamelVeeMessageInfo *mi;

    mi = (CamelVeeMessageInfo *)camel_folder_summary_uid(folder->summary, uid);
    if (mi) {
        camel_folder_set_message_user_flag(mi->folder, camel_message_info_uid(mi) + 8, name, value);
        camel_folder_summary_info_free(folder->summary, (CamelMessageInfo *)mi);
        ((CamelFolderClass *)camel_vee_folder_parent)->set_message_user_flag(folder, uid, name, value);
    }
}

static void
vee_set_message_user_tag(CamelFolder *folder, const char *uid, const char *name, const char *value)
{
    CamelVeeMessageInfo *mi;

    mi = (CamelVeeMessageInfo *)camel_folder_summary_uid(folder->summary, uid);
    if (mi) {
        camel_folder_set_message_user_tag(mi->folder, camel_message_info_uid(mi) + 8, name, value);
        camel_folder_summary_info_free(folder->summary, (CamelMessageInfo *)mi);
        ((CamelFolderClass *)camel_vee_folder_parent)->set_message_user_tag(folder, uid, name, value);
    }
}

static void
vee_append_message(CamelFolder *folder, CamelMimeMessage *message, const CamelMessageInfo *info, char **appended_uid, CamelException *ex)
{
    camel_exception_set(ex, CAMEL_EXCEPTION_SYSTEM, _("Cannot copy or move messages into a Virtual Folder"));
}

static void
vee_transfer_messages_to (CamelFolder *folder, GPtrArray *uids, CamelFolder *dest, GPtrArray **transferred_uids, gboolean delete_originals, CamelException *ex)
{
    camel_exception_set(ex, CAMEL_EXCEPTION_SYSTEM, _("Cannot copy or move messages into a Virtual Folder"));
}

static void vee_rename(CamelFolder *folder, const char *new)
{
    CamelVeeFolder *vf = (CamelVeeFolder *)folder;

    g_free(vf->vname);
    vf->vname = g_strdup(new);

    ((CamelFolderClass *)camel_vee_folder_parent)->rename(folder, new);
}

/* ********************************************************************** *
   utility functions */

/* must be called with summary_lock held */
static CamelVeeMessageInfo *
vee_folder_add_info(CamelVeeFolder *vf, CamelFolder *f, CamelMessageInfo *info, const char hash[8])
{
    CamelVeeMessageInfo *mi;
    char *vuid;
    const char *uid;
    CamelFolder *folder = (CamelFolder *)vf;
    CamelMessageInfo *dinfo;

    uid = camel_message_info_uid(info);
    vuid = alloca(strlen(uid)+9);
    memcpy(vuid, hash, 8);
    strcpy(vuid+8, uid);
    dinfo = camel_folder_summary_uid(folder->summary, vuid);
    if (dinfo) {
        d(printf("w:clash, we already have '%s' in summary\n", vuid));
        camel_folder_summary_info_free(folder->summary, dinfo);
        return NULL;
    }

    d(printf("adding vuid %s to %s\n", vuid, vf->vname));

    mi = (CamelVeeMessageInfo *)camel_folder_summary_info_new(folder->summary);
    camel_message_info_dup_to(info, (CamelMessageInfo *)mi);
#ifdef DOEPOOLV
    mi->info.strings = e_poolv_set(mi->info.strings, CAMEL_MESSAGE_INFO_UID, vuid, FALSE);
#elif defined (DOESTRV)
    mi->info.strings = e_strv_set_ref(mi->info.strings, CAMEL_MESSAGE_INFO_UID, vuid);
    mi->info.strings = e_strv_pack(mi->info.strings);
#else   
    g_free(mi->info.uid);
    mi->info.uid = g_strdup(vuid);
#endif
    mi->folder = f;
    camel_folder_summary_add(folder->summary, (CamelMessageInfo *)mi);

    return mi;
}

/* must be called with summary_lock held */
static CamelVeeMessageInfo *
vee_folder_add_uid(CamelVeeFolder *vf, CamelFolder *f, const char *inuid, const char hash[8])
{
    CamelMessageInfo *info;
    CamelVeeMessageInfo *mi = NULL;

    info = camel_folder_get_message_info(f, inuid);
    if (info) {
        mi = vee_folder_add_info(vf, f, info, hash);
        camel_folder_free_message_info(f, info);
    }
    return mi;
}

static void
vee_folder_remove_folder(CamelVeeFolder *vf, CamelFolder *source, int killun)
{
    int i, count, n, still, start, last;
    char *oldkey;
    CamelFolder *folder = (CamelFolder *)vf;
    char hash[8];
    /*struct _CamelVeeFolderPrivate *p = _PRIVATE(vf);*/
    CamelFolderChangeInfo *vf_changes = NULL, *unmatched_changes = NULL;
    void *oldval;
    
    if (vf == folder_unmatched)
        return;

    /* check if this folder is still to be part of unmatched */
    if ((vf->flags & CAMEL_STORE_FOLDER_PRIVATE) == 0 && !killun) {
        CAMEL_VEE_FOLDER_LOCK(folder_unmatched, subfolder_lock);
        still = g_list_find(_PRIVATE(folder_unmatched)->folders, source) != NULL;
        CAMEL_VEE_FOLDER_UNLOCK(folder_unmatched, subfolder_lock);
        camel_vee_folder_hash_folder(source, hash);
    } else {
        still = FALSE;
    }

    CAMEL_VEE_FOLDER_LOCK(vf, summary_lock);
    CAMEL_VEE_FOLDER_LOCK(folder_unmatched, summary_lock);

    /* See if we just blow all uid's from this folder away from unmatched, regardless */
    if (killun) {
        start = -1;
        last = -1;
        count = camel_folder_summary_count(((CamelFolder *)folder_unmatched)->summary);
        for (i=0;i<count;i++) {
            CamelVeeMessageInfo *mi = (CamelVeeMessageInfo *)camel_folder_summary_index(((CamelFolder *)folder_unmatched)->summary, i);
            
            if (mi) {
                if (mi->folder == source) {
                    camel_folder_change_info_remove_uid(folder_unmatched->changes, camel_message_info_uid(mi));
                    if (last == -1) {
                        last = start = i;
                    } else if (last+1 == i) {
                        last = i;
                    } else {
                        camel_folder_summary_remove_range(((CamelFolder *)folder_unmatched)->summary, start, last);
                        i -= (last-start)+1;
                        start = last = i;
                    }
                }
                camel_folder_summary_info_free(((CamelFolder *)folder_unmatched)->summary, (CamelMessageInfo *)mi);
            }
        }
        if (last != -1)
            camel_folder_summary_remove_range(((CamelFolder *)folder_unmatched)->summary, start, last);
    }

    start = -1;
    last = -1;
    count = camel_folder_summary_count(folder->summary);
    for (i=0;i<count;i++) {
        CamelVeeMessageInfo *mi = (CamelVeeMessageInfo *)camel_folder_summary_index(folder->summary, i);
        if (mi) {
            if (mi->folder == source) {
                const char *uid = camel_message_info_uid(mi);

                camel_folder_change_info_remove_uid(vf->changes, uid);

                if (last == -1) {
                    last = start = i;
                } else if (last+1 == i) {
                    last = i;
                } else {
                    camel_folder_summary_remove_range(folder->summary, start, last);
                    i -= (last-start)+1;
                    start = last = i;
                }
                if ((vf->flags & CAMEL_STORE_FOLDER_PRIVATE) == 0) {
                    if (still) {
                        if (g_hash_table_lookup_extended(unmatched_uids, uid, (void **)&oldkey, &oldval)) {
                            n = GPOINTER_TO_INT (oldval);
                            if (n == 1) {
                                g_hash_table_remove(unmatched_uids, oldkey);
                                if (vee_folder_add_uid(folder_unmatched, source, oldkey+8, hash))
                                    camel_folder_change_info_add_uid(folder_unmatched->changes, oldkey);
                                g_free(oldkey);
                            } else {
                                g_hash_table_insert(unmatched_uids, oldkey, GINT_TO_POINTER(n-1));
                            }
                        }
                    } else {
                        if (g_hash_table_lookup_extended(unmatched_uids, camel_message_info_uid(mi), (void **)&oldkey, &oldval)) {
                            g_hash_table_remove(unmatched_uids, oldkey);
                            g_free(oldkey);
                        }
                    }
                }
            }
            camel_folder_summary_info_free(folder->summary, (CamelMessageInfo *)mi);
        }
    }

    if (last != -1)
        camel_folder_summary_remove_range(folder->summary, start, last);

    if (camel_folder_change_info_changed(folder_unmatched->changes)) {
        unmatched_changes = folder_unmatched->changes;
        folder_unmatched->changes = camel_folder_change_info_new();
    }

    if (camel_folder_change_info_changed(vf->changes)) {
        vf_changes = vf->changes;
        vf->changes = camel_folder_change_info_new();
    }

    CAMEL_VEE_FOLDER_UNLOCK(folder_unmatched, summary_lock);
    CAMEL_VEE_FOLDER_UNLOCK(vf, summary_lock);

    if (unmatched_changes) {
        camel_object_trigger_event((CamelObject *)folder_unmatched, "folder_changed", unmatched_changes);
        camel_folder_change_info_free(unmatched_changes);
    }

    if (vf_changes) {
        camel_object_trigger_event((CamelObject *)vf, "folder_changed", vf_changes);
        camel_folder_change_info_free(vf_changes);
    }
}

struct _update_data {
    CamelFolder *source;
    CamelVeeFolder *vf;
    char hash[8];
};

static void
unmatched_check_uid(char *uidin, void *value, struct _update_data *u)
{
    char *uid;
    int n;

    uid = alloca(strlen(uidin)+9);
    memcpy(uid, u->hash, 8);
    strcpy(uid+8, uidin);
    n = GPOINTER_TO_INT(g_hash_table_lookup(unmatched_uids, uid));
    if (n == 0) {
        if (vee_folder_add_uid(folder_unmatched, u->source, uidin, u->hash))
            camel_folder_change_info_add_uid(folder_unmatched->changes, uid);
    } else {
        CamelVeeMessageInfo *mi = (CamelVeeMessageInfo *)camel_folder_summary_uid(((CamelFolder *)folder_unmatched)->summary, uid);
        if (mi) {
            camel_folder_summary_remove(((CamelFolder *)folder_unmatched)->summary, (CamelMessageInfo *)mi);
            camel_folder_change_info_remove_uid(folder_unmatched->changes, uid);
            camel_folder_summary_info_free(((CamelFolder *)folder_unmatched)->summary, (CamelMessageInfo *)mi);
        }
    }
}

static void
folder_added_uid(char *uidin, void *value, struct _update_data *u)
{
    CamelVeeMessageInfo *mi;
    char *oldkey;
    void *oldval;
    int n;

    if ( (mi = vee_folder_add_uid(u->vf, u->source, uidin, u->hash)) ) {
        camel_folder_change_info_add_uid(u->vf->changes, camel_message_info_uid(mi));

        if (!CAMEL_IS_VEE_FOLDER(u->source)) {
            if (g_hash_table_lookup_extended(unmatched_uids, camel_message_info_uid(mi), (void **)&oldkey, &oldval)) {
                n = GPOINTER_TO_INT (oldval);
                g_hash_table_insert(unmatched_uids, oldkey, GINT_TO_POINTER(n+1));
            } else {
                g_hash_table_insert(unmatched_uids, g_strdup(camel_message_info_uid(mi)), GINT_TO_POINTER(1));
            }
        }
    }
}

/* build query contents for a single folder */
static int
vee_folder_build_folder(CamelVeeFolder *vf, CamelFolder *source, CamelException *ex)
{
    GPtrArray *match, *all;
    GHashTable *allhash, *matchhash;
    CamelFolder *f = source;
    CamelFolder *folder = (CamelFolder *)vf;
    int i, n, count, start, last;
    struct _update_data u;
    CamelFolderChangeInfo *vf_changes = NULL, *unmatched_changes = NULL;

    if (vf == folder_unmatched)
        return 0;

    /* if we have no expression, or its been cleared, then act as if no matches */
    if (vf->expression == NULL) {
        match = g_ptr_array_new();
    } else {
        match = camel_folder_search_by_expression(f, vf->expression, ex);
        if (match == NULL)
            return -1;
    }

    u.source = source;
    u.vf = vf;
    camel_vee_folder_hash_folder(source, u.hash);

    CAMEL_VEE_FOLDER_LOCK(vf, summary_lock);

    /* we build 2 hash tables, one for all uid's not matched, the other for all matched uid's,
       we just ref the real memory */
    matchhash = g_hash_table_new(g_str_hash, g_str_equal);
    for (i=0;i<match->len;i++)
        g_hash_table_insert(matchhash, match->pdata[i], GINT_TO_POINTER (1));

    allhash = g_hash_table_new(g_str_hash, g_str_equal);
    all = camel_folder_get_uids(f);
    for (i=0;i<all->len;i++)
        if (g_hash_table_lookup(matchhash, all->pdata[i]) == NULL)
            g_hash_table_insert(allhash, all->pdata[i], GINT_TO_POINTER (1));

    CAMEL_VEE_FOLDER_LOCK(folder_unmatched, summary_lock);

    /* scan, looking for "old" uid's to be removed */
    start = -1;
    last = -1;
    count = camel_folder_summary_count(folder->summary);
    for (i=0;i<count;i++) {
        CamelVeeMessageInfo *mi = (CamelVeeMessageInfo *)camel_folder_summary_index(folder->summary, i);

        if (mi) {
            if (mi->folder == source) {
                char *uid = (char *)camel_message_info_uid(mi), *oldkey;
                void *oldval;
                
                if (g_hash_table_lookup(matchhash, uid+8) == NULL) {
                    if (last == -1) {
                        last = start = i;
                    } else if (last+1 == i) {
                        last = i;
                    } else {
                        camel_folder_summary_remove_range(folder->summary, start, last);
                        i -= (last-start)+1;
                        start = last = i;
                    }
                    camel_folder_change_info_remove_uid(vf->changes, camel_message_info_uid(mi));
                    if (!CAMEL_IS_VEE_FOLDER(source)
                        && g_hash_table_lookup_extended(unmatched_uids, uid, (void **)&oldkey, &oldval)) {
                        n = GPOINTER_TO_INT (oldval);
                        if (n == 1) {
                            g_hash_table_remove(unmatched_uids, oldkey);
                            g_free(oldkey);
                        } else {
                            g_hash_table_insert(unmatched_uids, oldkey, GINT_TO_POINTER(n-1));
                        }
                    }
                } else {
                    g_hash_table_remove(matchhash, uid+8);
                }
            }
            camel_folder_summary_info_free(folder->summary, (CamelMessageInfo *)mi);
        }
    }
    if (last != -1)
        camel_folder_summary_remove_range(folder->summary, start, last);

    /* now matchhash contains any new uid's, add them, etc */
    g_hash_table_foreach(matchhash, (GHFunc)folder_added_uid, &u);

    /* scan unmatched, remove any that have vanished, etc */
    count = camel_folder_summary_count(((CamelFolder *)folder_unmatched)->summary);
    for (i=0;i<count;i++) {
        CamelVeeMessageInfo *mi = (CamelVeeMessageInfo *)camel_folder_summary_index(((CamelFolder *)folder_unmatched)->summary, i);

        if (mi) {
            if (mi->folder == source) {
                char *uid = (char *)camel_message_info_uid(mi);

                if (g_hash_table_lookup(allhash, uid+8) == NULL) {
                    /* no longer exists at all, just remove it entirely */
                    camel_folder_summary_remove_index(((CamelFolder *)folder_unmatched)->summary, i);
                    camel_folder_change_info_remove_uid(folder_unmatched->changes, camel_message_info_uid(mi));
                    i--;
                } else {
                    g_hash_table_remove(allhash, uid+8);
                }
            }
            camel_folder_summary_info_free(((CamelFolder *)folder_unmatched)->summary, (CamelMessageInfo *)mi);
        }
    }

    /* now allhash contains all potentially new uid's for the unmatched folder, process */
    if (!CAMEL_IS_VEE_FOLDER(source))
        g_hash_table_foreach(allhash, (GHFunc)unmatched_check_uid, &u);

    /* copy any changes so we can raise them outside the lock */
    if (camel_folder_change_info_changed(folder_unmatched->changes)) {
        unmatched_changes = folder_unmatched->changes;
        folder_unmatched->changes = camel_folder_change_info_new();
    }

    if (camel_folder_change_info_changed(vf->changes)) {
        vf_changes = vf->changes;
        vf->changes = camel_folder_change_info_new();
    }

    CAMEL_VEE_FOLDER_UNLOCK(folder_unmatched, summary_lock);
    CAMEL_VEE_FOLDER_UNLOCK(vf, summary_lock);

    g_hash_table_destroy(matchhash);
    g_hash_table_destroy(allhash);
    /* if expression not set, we only had a null list */
    if (vf->expression == NULL)
        g_ptr_array_free(match, TRUE);
    else
        camel_folder_search_free(f, match);
    camel_folder_free_uids(f, all);

    if (unmatched_changes) {
        camel_object_trigger_event((CamelObject *)folder_unmatched, "folder_changed", unmatched_changes);
        camel_folder_change_info_free(unmatched_changes);
    }

    if (vf_changes) {
        camel_object_trigger_event((CamelObject *)vf, "folder_changed", vf_changes);
        camel_folder_change_info_free(vf_changes);
    }

    return 0;
}

/*

  (match-folder "folder1" "folder2")

 */


/* Hold all these with summary lock and unmatched summary lock held */
static void
folder_changed_add_uid(CamelFolder *sub, const char *uid, const char hash[8], CamelVeeFolder *vf)
{
    CamelVeeMessageInfo *vinfo;
    const char *vuid;
    char *oldkey;
    void *oldval;
    int n;

    vinfo = vee_folder_add_uid(vf, sub, uid, hash);
    if (vinfo == NULL)
        return;
    
    vuid = camel_message_info_uid(vinfo);
    camel_folder_change_info_add_uid(vf->changes,  vuid);

    if ((vf->flags & CAMEL_STORE_FOLDER_PRIVATE) == 0 && !CAMEL_IS_VEE_FOLDER(sub)) {
        if (g_hash_table_lookup_extended(unmatched_uids, vuid, (void **)&oldkey, &oldval)) {
            n = GPOINTER_TO_INT (oldval);
            g_hash_table_insert(unmatched_uids, oldkey, GINT_TO_POINTER(n+1));
        } else {
            g_hash_table_insert(unmatched_uids, g_strdup(vuid), GINT_TO_POINTER (1));
        }
        vinfo = (CamelVeeMessageInfo *)camel_folder_get_message_info((CamelFolder *)folder_unmatched, vuid);
        if (vinfo) {
            camel_folder_change_info_remove_uid(folder_unmatched->changes, vuid);
            camel_folder_summary_remove(((CamelFolder *)folder_unmatched)->summary, (CamelMessageInfo *)vinfo);
            camel_folder_free_message_info((CamelFolder *)folder_unmatched, (CamelMessageInfo *)vinfo);
        }
    }
}

static void
folder_changed_remove_uid(CamelFolder *sub, const char *uid, const char hash[8], int keep, CamelVeeFolder *vf)
{
    CamelFolder *folder = (CamelFolder *)vf;
    char *vuid, *oldkey;
    void *oldval;
    int n;
    CamelVeeMessageInfo *vinfo;

    vuid = alloca(strlen(uid)+9);
    memcpy(vuid, hash, 8);
    strcpy(vuid+8, uid);

    vinfo = (CamelVeeMessageInfo *)camel_folder_summary_uid(folder->summary, vuid);
    if (vinfo) {
        camel_folder_change_info_remove_uid(vf->changes, vuid);
        camel_folder_summary_remove(folder->summary, (CamelMessageInfo *)vinfo);
        camel_folder_summary_info_free(folder->summary, (CamelMessageInfo *)vinfo);
    }

    if ((vf->flags & CAMEL_STORE_FOLDER_PRIVATE) == 0 && !CAMEL_IS_VEE_FOLDER(sub)) {
        if (keep) {
            if (g_hash_table_lookup_extended(unmatched_uids, vuid, (void **)&oldkey, &oldval)) {
                n = GPOINTER_TO_INT (oldval);
                if (n == 1) {
                    g_hash_table_remove(unmatched_uids, oldkey);
                    if (vee_folder_add_uid(folder_unmatched, sub, uid, hash))
                        camel_folder_change_info_add_uid(folder_unmatched->changes, oldkey);
                    g_free(oldkey);
                } else {
                    g_hash_table_insert(unmatched_uids, oldkey, GINT_TO_POINTER(n-1));
                }
            } else {
                if (vee_folder_add_uid(folder_unmatched, sub, uid, hash))
                    camel_folder_change_info_add_uid(folder_unmatched->changes, oldkey);
            }
        } else {
            if (g_hash_table_lookup_extended(unmatched_uids, vuid, (void **)&oldkey, &oldval)) {
                g_hash_table_remove(unmatched_uids, oldkey);
                g_free(oldkey);
            }

            vinfo = (CamelVeeMessageInfo *)camel_folder_get_message_info((CamelFolder *)folder_unmatched, vuid);
            if (vinfo) {
                camel_folder_change_info_remove_uid(folder_unmatched->changes, vuid);
                camel_folder_summary_remove_uid(((CamelFolder *)folder_unmatched)->summary, vuid);
                camel_folder_free_message_info((CamelFolder *)folder_unmatched, (CamelMessageInfo *)vinfo);
            }
        }
    }
}

static void
folder_changed_change_uid(CamelFolder *sub, const char *uid, const char hash[8], CamelVeeFolder *vf)
{
    char *vuid;
    CamelVeeMessageInfo *vinfo, *uinfo;
    CamelMessageInfo *info;
    CamelFolder *folder = (CamelFolder *)vf;

    vuid = alloca(strlen(uid)+9);
    memcpy(vuid, hash, 8);
    strcpy(vuid+8, uid);

    vinfo = (CamelVeeMessageInfo *)camel_folder_summary_uid(folder->summary, vuid);
    uinfo = (CamelVeeMessageInfo *)camel_folder_summary_uid(((CamelFolder *)folder_unmatched)->summary, vuid);
    if (vinfo || uinfo) {
        info = camel_folder_get_message_info(sub, uid);
        if (info) {
            if (vinfo) {
                int changed = FALSE;

                if (vinfo->info.flags != info->flags){
                    vinfo->info.flags = info->flags;
                    changed = TRUE;
                }
            
                changed |= camel_flag_list_copy(&vinfo->info.user_flags, &info->user_flags);
                changed |= camel_tag_list_copy(&vinfo->info.user_tags, &info->user_tags);
                if (changed)
                    camel_folder_change_info_change_uid(vf->changes, vuid);

                camel_folder_summary_info_free(folder->summary, (CamelMessageInfo *)vinfo);
            }

            if (uinfo) {
                int changed = FALSE;

                if (uinfo->info.flags != info->flags){
                    uinfo->info.flags = info->flags;
                    changed = TRUE;
                }
            
                changed |= camel_flag_list_copy(&uinfo->info.user_flags, &info->user_flags);
                changed |= camel_tag_list_copy(&uinfo->info.user_tags, &info->user_tags);
                if (changed)
                    camel_folder_change_info_change_uid(folder_unmatched->changes, vuid);

                camel_folder_summary_info_free(((CamelFolder *)folder_unmatched)->summary, (CamelMessageInfo *)uinfo);
            }

            camel_folder_free_message_info(sub, info);
        } else {
            if (vinfo) {
                folder_changed_remove_uid(sub, uid, hash, FALSE, vf);
                camel_folder_summary_info_free(folder->summary, (CamelMessageInfo *)vinfo);
            }
            if (uinfo)
                camel_folder_summary_info_free(((CamelFolder *)folder_unmatched)->summary, (CamelMessageInfo *)uinfo);
        }
    }
}

struct _folder_changed_msg {
    CamelSessionThreadMsg msg;
    CamelFolderChangeInfo *changes;
    CamelFolder *sub;
    CamelVeeFolder *vf;
};

static void
folder_changed_change(CamelSession *session, CamelSessionThreadMsg *msg)
{
    struct _folder_changed_msg *m = (struct _folder_changed_msg *)msg;
    CamelFolder *sub = m->sub;
    CamelFolder *folder = (CamelFolder *)m->vf;
    CamelVeeFolder *vf = m->vf;
    CamelFolderChangeInfo *changes = m->changes;
    char *vuid = NULL, hash[8];
    const char *uid;
    CamelVeeMessageInfo *vinfo;
    int i, vuidlen = 0;
    CamelFolderChangeInfo *vf_changes = NULL, *unmatched_changes = NULL;
    GPtrArray *matches_added = NULL, /* newly added, that match */
        *matches_changed = NULL, /* newly changed, that now match */
        *newchanged = NULL,
        *changed;
    GPtrArray *always_changed = NULL;
    GHashTable *matches_hash;

    /* Check the folder hasn't beem removed while we weren't watching */
    CAMEL_VEE_FOLDER_LOCK(vf, subfolder_lock);
    if (g_list_find(_PRIVATE(vf)->folders, sub) == NULL) {
        CAMEL_VEE_FOLDER_UNLOCK(vf, subfolder_lock);
        return;
    }

    camel_vee_folder_hash_folder(sub, hash);

    /* Lookup anything before we lock anything, to avoid deadlock with build_folder */

    /* Find newly added that match */
    if (changes->uid_added->len > 0) {
        dd(printf(" Searching for added matches '%s'\n", vf->expression));
        matches_added = camel_folder_search_by_uids(sub, vf->expression, changes->uid_added, NULL);
    }

    /* TODO:
       In this code around here, we can work out if the search will affect the changes
       we had, and only re-search against them if they might have */

    /* Search for changed items that newly match, but only if we dont have them */
    changed = changes->uid_changed;
    if (changed->len > 0) {
        dd(printf(" Searching for changed matches '%s'\n", vf->expression));

        if ((vf->flags & CAMEL_STORE_VEE_FOLDER_AUTO) == 0) {
            newchanged = g_ptr_array_new();
            always_changed = g_ptr_array_new();
            for (i=0;i<changed->len;i++) {
                uid = changed->pdata[i];
                if (strlen(uid)+9 > vuidlen) {
                    vuidlen = strlen(uid)+64;
                    vuid = g_realloc(vuid, vuidlen);
                }
                memcpy(vuid, hash, 8);
                strcpy(vuid+8, uid);
                vinfo = (CamelVeeMessageInfo *)camel_folder_summary_uid(folder->summary, vuid);
                if (vinfo == NULL) {
                    g_ptr_array_add(newchanged, (char *)uid);
                } else {
                    g_ptr_array_add(always_changed, (char *)uid);
                    camel_folder_summary_info_free(folder->summary, (CamelMessageInfo *)vinfo);
                }
            }
            changed = newchanged;
        }

        if (changed->len)
            matches_changed = camel_folder_search_by_uids(sub, vf->expression, changed, NULL);
    }

    CAMEL_VEE_FOLDER_LOCK(vf, summary_lock);
    CAMEL_VEE_FOLDER_LOCK(folder_unmatched, summary_lock);

    dd(printf("Vfolder '%s' subfolder changed '%s'\n", folder->full_name, sub->full_name));
    dd(printf(" changed %d added %d removed %d\n", changes->uid_changed->len, changes->uid_added->len, changes->uid_removed->len));

    /* Always remove removed uid's, in any case */
    for (i=0;i<changes->uid_removed->len;i++) {
        dd(printf("  removing uid '%s'\n", (char *)changes->uid_removed->pdata[i]));
        folder_changed_remove_uid(sub, changes->uid_removed->pdata[i], hash, FALSE, vf);
    }

    /* Add any newly matched or to unmatched folder if they dont */
    if (matches_added) {
        matches_hash = g_hash_table_new(g_str_hash, g_str_equal);
        for (i=0;i<matches_added->len;i++) {
            dd(printf(" %s", (char *)matches_added->pdata[i]));
            g_hash_table_insert(matches_hash, matches_added->pdata[i], matches_added->pdata[i]);
        }
        for (i=0;i<changes->uid_added->len;i++) {
            uid = changes->uid_added->pdata[i];
            if (g_hash_table_lookup(matches_hash, uid)) {
                dd(printf("  adding uid '%s' [newly matched]\n", (char *)uid));
                folder_changed_add_uid(sub, uid, hash, vf);
            } else if ((vf->flags & CAMEL_STORE_FOLDER_PRIVATE) == 0) {
                if (strlen(uid)+9 > vuidlen) {
                    vuidlen = strlen(uid)+64;
                    vuid = g_realloc(vuid, vuidlen);
                }
                memcpy(vuid, hash, 8);
                strcpy(vuid+8, uid);
                
                if (!CAMEL_IS_VEE_FOLDER(sub) && g_hash_table_lookup(unmatched_uids, vuid) == NULL) {
                    dd(printf("  adding uid '%s' to Unmatched [newly unmatched]\n", (char *)uid));
                    vinfo = (CamelVeeMessageInfo *)camel_folder_get_message_info((CamelFolder *)folder_unmatched, vuid);
                    if (vinfo == NULL) {
                        if (vee_folder_add_uid(folder_unmatched, sub, uid, hash))
                            camel_folder_change_info_add_uid(folder_unmatched->changes, vuid);
                    } else {
                        camel_folder_free_message_info((CamelFolder *)folder_unmatched, (CamelMessageInfo *)vinfo);
                    }
                }
            }
        }
        g_hash_table_destroy(matches_hash);
    }

    /* Change any newly changed */
    if (always_changed) {
        for (i=0;i<always_changed->len;i++)
            folder_changed_change_uid(sub, always_changed->pdata[i], hash, vf);
        g_ptr_array_free(always_changed, TRUE);
    }

    /* Change/add/remove any changed */
    if (matches_changed) {
        /* If we are auto-updating, then re-check changed uids still match */
        dd(printf(" Vfolder %supdate\nuids match:", (vf->flags & CAMEL_STORE_VEE_FOLDER_AUTO)?"auto-":""));
        matches_hash = g_hash_table_new(g_str_hash, g_str_equal);
        for (i=0;i<matches_changed->len;i++) {
            dd(printf(" %s", (char *)matches_changed->pdata[i]));
            g_hash_table_insert(matches_hash, matches_changed->pdata[i], matches_changed->pdata[i]);
        }
        dd(printf("\n"));
        for (i=0;i<changed->len;i++) {
            uid = changed->pdata[i];
            if (strlen(uid)+9 > vuidlen) {
                vuidlen = strlen(uid)+64;
                vuid = g_realloc(vuid, vuidlen);
            }
            memcpy(vuid, hash, 8);
            strcpy(vuid+8, uid);
            vinfo = (CamelVeeMessageInfo *)camel_folder_summary_uid(folder->summary, vuid);
            if (vinfo == NULL) {
                /* A uid we dont have, but now it matches, add it */
                if (g_hash_table_lookup(matches_hash, uid)) {
                    dd(printf("  adding uid '%s' [newly matched]\n", uid));
                    folder_changed_add_uid(sub, uid, hash, vf);
                }
            } else {
                if ((vf->flags & CAMEL_STORE_VEE_FOLDER_AUTO) == 0
                    || g_hash_table_lookup(matches_hash, uid)) {
                    /* still match, or we're not auto-updating, change event, (if it changed) */
                    dd(printf("  changing uid '%s' [still matches]\n", uid));
                    folder_changed_change_uid(sub, uid, hash, vf);
                } else {
                    /* No longer matches, remove it, but keep it in unmatched (potentially) */
                    dd(printf("  removing uid '%s' [did match]\n", uid));
                    folder_changed_remove_uid(sub, uid, hash, TRUE, vf);
                }
                camel_folder_summary_info_free(folder->summary, (CamelMessageInfo *)vinfo);
            }
        }
        g_hash_table_destroy(matches_hash);
    }

    if (camel_folder_change_info_changed(folder_unmatched->changes)) {
        unmatched_changes = folder_unmatched->changes;
        folder_unmatched->changes = camel_folder_change_info_new();
    }
        
    if (camel_folder_change_info_changed(vf->changes)) {
        vf_changes = vf->changes;
        vf->changes = camel_folder_change_info_new();
    }

    CAMEL_VEE_FOLDER_UNLOCK(folder_unmatched, summary_lock);
    CAMEL_VEE_FOLDER_UNLOCK(vf, summary_lock);

    /* Cleanup stuff on our folder */
    if (matches_added)
        camel_folder_search_free(sub, matches_added);

    if (matches_changed)
        camel_folder_search_free(sub, matches_changed);

    CAMEL_VEE_FOLDER_UNLOCK(vf, subfolder_lock);

    /* cleanup the rest */
    if (newchanged)
        g_ptr_array_free(newchanged, TRUE);

    g_free(vuid);

    if (unmatched_changes) {
        camel_object_trigger_event((CamelObject *)folder_unmatched, "folder_changed", unmatched_changes);
        camel_folder_change_info_free(unmatched_changes);
    }
    
    if (vf_changes) {
        /* If not auto-updating, keep track of changed folders for later re-sync */
        if ((vf->flags & CAMEL_STORE_VEE_FOLDER_AUTO) == 0) {
            CAMEL_VEE_FOLDER_LOCK(vf, changed_lock);
            if (g_list_find(vf->priv->folders_changed, sub) != NULL)
                vf->priv->folders_changed = g_list_prepend(vf->priv->folders_changed, sub);
            CAMEL_VEE_FOLDER_UNLOCK(vf, changed_lock);
        }

        camel_object_trigger_event((CamelObject *)vf, "folder_changed", vf_changes);
        camel_folder_change_info_free(vf_changes);
    }
}

static void
folder_changed_free(CamelSession *session, CamelSessionThreadMsg *msg)
{
    struct _folder_changed_msg *m = (struct _folder_changed_msg *)msg;

    camel_folder_change_info_free(m->changes);
    camel_object_unref((CamelObject *)m->vf);
    camel_object_unref((CamelObject *)m->sub);
}

static CamelSessionThreadOps folder_changed_ops = {
    folder_changed_change,
    folder_changed_free,
};

static void
folder_changed(CamelFolder *sub, CamelFolderChangeInfo *changes, CamelVeeFolder *vf)
{
    struct _folder_changed_msg *m;
    CamelSession *session = ((CamelService *)((CamelFolder *)vf)->parent_store)->session;
    
    m = camel_session_thread_msg_new(session, &folder_changed_ops, sizeof(*m));
    m->changes = camel_folder_change_info_new();
    camel_folder_change_info_cat(m->changes, changes);
    m->sub = sub;
    camel_object_ref((CamelObject *)sub);
    m->vf = vf;
    camel_object_ref((CamelObject *)vf);
    camel_session_thread_queue(session, &m->msg, 0);
}

/* track flag changes in the summary, we just promote it to a folder_changed event */
static void
message_changed(CamelFolder *f, const char *uid, CamelVeeFolder *vf)
{
    CamelFolderChangeInfo *changes;

    changes = camel_folder_change_info_new();
    camel_folder_change_info_change_uid(changes, uid);
    folder_changed(f, changes, vf);
    camel_folder_change_info_free(changes);
}

/* track vanishing folders */
static void
subfolder_deleted(CamelFolder *f, void *event_data, CamelVeeFolder *vf)
{
    camel_vee_folder_remove_folder(vf, f);
}


static void
vee_freeze (CamelFolder *folder)
{
    CamelVeeFolder *vfolder = (CamelVeeFolder *) folder;
    struct _CamelVeeFolderPrivate *p = _PRIVATE (vfolder);
    GList *node;
    
    CAMEL_VEE_FOLDER_LOCK (vfolder, subfolder_lock);
    
    p->freeze_count++;
    
    node = p->folders;
    while (node) {
        CamelFolder *f = node->data;
        
        camel_folder_freeze (f);
        node = node->next;
    }
    
    CAMEL_VEE_FOLDER_UNLOCK (vfolder, subfolder_lock);
    
    /* call parent implementation */
    CAMEL_FOLDER_CLASS (camel_vee_folder_parent)->freeze (folder);
}

static void
vee_thaw (CamelFolder *folder)
{
    CamelVeeFolder *vfolder = (CamelVeeFolder *) folder;
    struct _CamelVeeFolderPrivate *p = _PRIVATE (vfolder);
    GList *node;
    
    CAMEL_VEE_FOLDER_LOCK (vfolder, subfolder_lock);
    
    p->freeze_count--;
    
    node = p->folders;
    while (node) {
        CamelFolder *f = node->data;
        
        camel_folder_thaw (f);
        node = node->next;
    }
    
    CAMEL_VEE_FOLDER_UNLOCK (vfolder, subfolder_lock);
    
    /* call parent implementation */
    CAMEL_FOLDER_CLASS (camel_vee_folder_parent)->thaw (folder);
}