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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* 
 * Copyright (C) 2005  Novell, Inc.
 *
 * 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.
 *
 * Author: Michael Zucchi <notzed@novell.com>
 */

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

#include <errno.h>
#include <string.h>
#include <bonobo/bonobo-shlib-factory.h>
#include <bonobo/bonobo-control.h>
#include <bonobo/bonobo-i18n.h>
#include <bonobo/bonobo-exception.h>
#include "evolution-mail-session.h"

#include <e-util/e-account-list.h>

#include "evolution-mail-store.h"
#include "e-corba-utils.h"

#include <camel/camel-session.h>

#define PARENT_TYPE bonobo_object_get_type ()

static BonoboObjectClass *parent_class = NULL;

#define _PRIVATE(o) (g_type_instance_get_private ((GTypeInstance *)o, evolution_mail_session_get_type()))

struct _EvolutionMailSessionPrivate {
    EAccountList *accounts;
    GList *stores;

    /* FIXME: locking */
    EDList listeners;

    guint account_added;
    guint account_changed;
    guint account_removed;
};

static int
is_storage(EAccount *ea)
{
    const char *uri;
    CamelProvider *prov;

    return(uri = e_account_get_string(ea, E_ACCOUNT_SOURCE_URL))
        && (prov = camel_provider_get(uri, NULL))
        && (prov->flags & CAMEL_PROVIDER_IS_STORAGE);
}

/* GObject methods */

static void
impl_dispose (GObject *object)
{
    struct _EvolutionMailSessionPrivate *p = _PRIVATE(object);

    if (p->stores) {
        /* FIXME: free stores */
    }

    /* FIXME: Free accounts */

    /* FIXME: free listners */

    (* G_OBJECT_CLASS (parent_class)->dispose) (object);
}

static void
impl_finalize (GObject *object)
{
    g_warning("EvolutionMailStore is finalised!\n");

    (* G_OBJECT_CLASS (parent_class)->finalize) (object);
}

/* Evolution.Mail.Session */

static CORBA_boolean
impl_getProperties(PortableServer_Servant _servant,
           const Evolution_Mail_PropertyNames* names,
           Evolution_Mail_Properties **props,
           CORBA_Environment * ev)
{
    EvolutionMailSession *ems = (EvolutionMailSession *)bonobo_object_from_servant(_servant);

    ems = ems;

    return CORBA_TRUE;
}

static Evolution_Mail_StoreInfos *
impl_getStores(PortableServer_Servant _servant,
           const CORBA_char * pattern,
           const Evolution_Mail_StoreListener listener,
           CORBA_Environment * ev)
{
    EvolutionMailSession *ems = (EvolutionMailSession *)bonobo_object_from_servant(_servant);
    struct _EvolutionMailSessionPrivate *p = _PRIVATE(ems);
    Evolution_Mail_StoreInfos *seq;
    int i, len;
    GList *l;

    seq = Evolution_Mail_StoreInfos__alloc();

    /* FIXME: pattern? */

    len = g_list_length(p->stores);

    seq->_length = len;
    seq->_maximum = len;
    seq->_buffer = Evolution_Mail_StoreInfos_allocbuf(seq->_length);
    CORBA_sequence_set_release(seq, TRUE);

    l = p->stores;
    for (i=0;l && i<len;i++) {
        EvolutionMailStore *store = l->data;

        evolution_mail_store_addlistener(store, listener);

        e_mail_storeinfo_set_store(&seq->_buffer[i], store);
        l = g_list_next(l);
    }

    return seq;
}

static void
impl_addListener(PortableServer_Servant _servant,
         const Evolution_Mail_SessionListener listener,
         CORBA_Environment * ev)
{
    EvolutionMailSession *ems = (EvolutionMailSession *)bonobo_object_from_servant(_servant);
    struct _EvolutionMailSessionPrivate *p = _PRIVATE(ems);

    e_mail_listener_add(&p->listeners, listener);
}

static void
impl_removeListener(PortableServer_Servant _servant,
            const Evolution_Mail_SessionListener listener,
            CORBA_Environment * ev)
{
    EvolutionMailSession *ems = (EvolutionMailSession *)bonobo_object_from_servant(_servant);
    struct _EvolutionMailSessionPrivate *p = _PRIVATE(ems);

    printf("Removing listener from session\n");

    if (!e_mail_listener_remove(&p->listeners, listener)) {
        printf("no more listeners, could shut down session?\n");
    }
}

/* Initialization */

static void
evolution_mail_session_class_init (EvolutionMailSessionClass *klass)
{
    POA_Evolution_Mail_Session__epv *epv = &klass->epv;
    GObjectClass *object_class = G_OBJECT_CLASS (klass);

    parent_class = g_type_class_peek_parent (klass);

    epv->getProperties = impl_getProperties;
    epv->getStores = impl_getStores;

    epv->addListener = impl_addListener;
    epv->removeListener = impl_removeListener;

    object_class->dispose = impl_dispose;
    object_class->finalize = impl_finalize;

    g_type_class_add_private(klass, sizeof(struct _EvolutionMailSessionPrivate));
}

static void
ems_set_changes(Evolution_Mail_SessionChange *change, Evolution_Mail_ChangeType how, EvolutionMailStore *store)
{
    change->type = how;
    change->stores._length = 1;
    change->stores._maximum = 1;
    change->stores._buffer = Evolution_Mail_StoreInfos_allocbuf(change->stores._maximum);
    CORBA_sequence_set_release(&change->stores, TRUE);

    e_mail_storeinfo_set_store(&change->stores._buffer[0], store);
}

static void
ems_listener_session_event(EvolutionMailSession *ems, Evolution_Mail_ChangeType how, EvolutionMailStore *store)
{
    Evolution_Mail_SessionChanges *changes;

    /* NB: we only ever create 1 changetype at the moment */

    changes = Evolution_Mail_SessionChanges__alloc();
    changes->_maximum = 1;
    changes->_length = 1;
    changes->_buffer = Evolution_Mail_SessionChanges_allocbuf(1);
    CORBA_sequence_set_release(changes, TRUE);
    ems_set_changes(&changes->_buffer[0], how, store);

    evolution_mail_session_changed(ems, changes);

    CORBA_free(changes);
}

static void
ems_account_added(EAccountList *eal, EAccount *ea, EvolutionMailSession *ems)
{
    struct _EvolutionMailSessionPrivate *p = _PRIVATE(ems);

    if (ea->enabled && is_storage(ea)) {
        EvolutionMailStore *store;

        printf("Account added %s\n", ea->uid);
        store = evolution_mail_store_new(ems, ea);
        p->stores = g_list_append(p->stores, store);
        ems_listener_session_event(ems, Evolution_Mail_ADDED, store);
    }
}

static void
ems_account_changed(EAccountList *eal, EAccount *ea, EvolutionMailSession *ems)
{
    struct _EvolutionMailSessionPrivate *p = _PRIVATE(ems);
    EvolutionMailStore *store = NULL;
    GList *l;

    for (l = p->stores;l;l=l->next) {
        if (((EvolutionMailStore *)l->data)->account == ea) {
            store = l->data;
            break;
        }
    }

    if (store) {
        /* account has been disabled? */
        if (!ea->enabled) {
            printf("Account changed, now disabled %s\n", ea->uid);
            p->stores = g_list_remove(p->stores, store);
            ems_listener_session_event(ems, Evolution_Mail_REMOVED, store);
            g_object_unref(store);
        } else {
            printf("Account changed, dont know how %s\n", ea->uid);
            ems_listener_session_event(ems, Evolution_Mail_CHANGED, store);
        }
    } else if (ea->enabled && is_storage(ea)) {
        printf("Account changed, now added %s\n", ea->uid);
        store = evolution_mail_store_new(ems, ea);
        p->stores = g_list_append(p->stores, store);
        ems_listener_session_event(ems, Evolution_Mail_ADDED, store);
    }
}

static void
ems_account_removed(EAccountList *eal, EAccount *ea, EvolutionMailSession *ems)
{
    struct _EvolutionMailSessionPrivate *p = _PRIVATE(ems);
    GList *l;

    /* for accounts we dont have, we dont care */

    for (l = p->stores;l;l=l->next) {
        EvolutionMailStore *store = l->data;

        if (store->account == ea) {
            printf("Account removed %s\n", ea->uid);
            p->stores = g_list_remove(p->stores, store);
            ems_listener_session_event(ems, Evolution_Mail_REMOVED, store);
            g_object_unref(store);
            break;
        }
    }
}

static void
evolution_mail_session_init (EvolutionMailSession *ems, EvolutionMailSessionClass *klass)
{
    GConfClient *gconf = gconf_client_get_default();
    struct _EvolutionMailSessionPrivate *p = _PRIVATE(ems);
    EIterator *iter;

    printf("EvolutionMailSession.init\n");

    e_dlist_init(&p->listeners);

    /* local store first */
    p->stores = g_list_append(p->stores, evolution_mail_store_new(ems, NULL));

    p->accounts = e_account_list_new(gconf);
    iter = e_list_get_iterator((EList *)p->accounts);
    while (e_iterator_is_valid (iter)) {
        EAccount *ea;

        if ((ea = (EAccount *)e_iterator_get(iter))
            && ea->enabled
            && is_storage(ea)) {
            p->stores = g_list_append(p->stores, evolution_mail_store_new(ems, ea));
        }

        e_iterator_next(iter);
    }
    g_object_unref(iter);

    g_object_unref(gconf);

    p->account_added = g_signal_connect(p->accounts, "account_added", G_CALLBACK(ems_account_added), ems);
    p->account_changed = g_signal_connect(p->accounts, "account_changed", G_CALLBACK(ems_account_changed), ems);
    p->account_removed = g_signal_connect(p->accounts, "account_removed", G_CALLBACK(ems_account_removed), ems);

    ems->session = mail_component_peek_session(NULL);

    bonobo_object_set_immortal((BonoboObject *)ems, TRUE);
}

void
evolution_mail_session_changed(EvolutionMailSession *ems, Evolution_Mail_SessionChanges *changes)
{
    struct _EvolutionMailSessionPrivate *p = _PRIVATE(ems);

    if (!e_mail_listener_emit(&p->listeners, (EMailListenerChanged)Evolution_Mail_SessionListener_changed,
                  bonobo_object_corba_objref((BonoboObject *)ems), changes)) {
        printf("No more listeners for store, could dispose session object now?\n");
    }
}

BONOBO_TYPE_FUNC_FULL (EvolutionMailSession, Evolution_Mail_Session, PARENT_TYPE, evolution_mail_session)