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/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 */

/**
 * SECTION: e-account-utils
 * @include: e-util/e-account-utils.h
 **/

#include "e-account-utils.h"

#include <gconf/gconf-client.h>

static EAccountList *global_account_list;

static gboolean
account_has_source_url (EAccount *account)
{
    return (account != NULL) &&
        (account->enabled) &&
        (account->source != NULL) &&
        (account->source->url != NULL) &&
        (account->source->url[0] != '\0');
}

static gboolean
account_has_transport_url (EAccount *account)
{
    return (account != NULL) &&
        (account->enabled) &&
        (account->transport != NULL) &&
        (account->transport->url != NULL) &&
        (account->transport->url[0] != '\0');
}

/**
 * e_get_account_list:
 *
 * Returns the global #EAccountList.
 *
 * Returns: the global #EAccountList
 **/
EAccountList *
e_get_account_list (void)
{
    if (G_UNLIKELY (global_account_list == NULL)) {
        GConfClient *client;

        client = gconf_client_get_default ();
        global_account_list = e_account_list_new (client);
        g_object_unref (client);
    }

    g_return_val_if_fail (global_account_list != NULL, NULL);

    return global_account_list;
}

/**
 * e_get_default_account:
 *
 * Returns the #EAccount marked as the default mail account.
 *
 * Returns: the default #EAccount
 **/
EAccount *
e_get_default_account (void)
{
    EAccountList *account_list;
    const EAccount *account;

    account_list = e_get_account_list ();
    account = e_account_list_get_default (account_list);

    /* XXX EAccountList misuses const. */
    return (EAccount *) account;
}

/**
 * e_set_default_account:
 * @account: an #EAccount
 *
 * Marks @account as the default mail account.
 **/
void
e_set_default_account (EAccount *account)
{
    EAccountList *account_list;

    g_return_if_fail (E_IS_ACCOUNT (account));

    account_list = e_get_account_list ();
    e_account_list_set_default (account_list, account);
}

/**
 * e_get_account_by_name:
 * @name: a mail account name
 *
 * Returns the #EAccount with the given name, or %NULL if no such
 * account exists.
 *
 * Returns: an #EAccount having the given account name, or %NULL
 **/
EAccount *
e_get_account_by_name (const gchar *name)
{
    EAccountList *account_list;
    const EAccount *account;
    e_account_find_t find;

    g_return_val_if_fail (name != NULL, NULL);

    find = E_ACCOUNT_FIND_NAME;
    account_list = e_get_account_list ();
    account = e_account_list_find (account_list, find, name);

    /* XXX EAccountList misuses const. */
    return (EAccount *) account;
}

/**
 * e_get_account_by_uid:
 * @uid: a mail account UID
 *
 * Returns the #EAccount with the given unique ID, or %NULL if no such
 * account exists.
 *
 * Returns: an #EAccount having the given unique ID, or %NULL
 **/
EAccount *
e_get_account_by_uid (const gchar *uid)
{
    EAccountList *account_list;
    const EAccount *account;
    e_account_find_t find;

    g_return_val_if_fail (uid != NULL, NULL);

    find = E_ACCOUNT_FIND_UID;
    account_list = e_get_account_list ();
    account = e_account_list_find (account_list, find, uid);

    /* XXX EAccountList misuses const. */
    return (EAccount *) account;
}

/**
 * e_get_account_by_source_url:
 * @source_url: a source URL
 *
 * Returns the #EAccount with the given source URL, or %NULL if no such
 * account exists.
 *
 * Returns: an #EAccount having the given source URL, or %NULL
 **/
EAccount *
e_get_account_by_source_url (const gchar *source_url)
{
    EAccountList *account_list;
    EAccount *account = NULL;
    EIterator *iterator;
    CamelProvider *provider;
    CamelURL *source_curl;

    g_return_val_if_fail (source_url != NULL, NULL);

    source_curl = camel_url_new (source_url, NULL);
    g_return_val_if_fail (source_curl != NULL, NULL);

    provider = camel_provider_get (source_url, NULL);
    g_return_val_if_fail (provider != NULL, NULL);
    g_return_val_if_fail (provider->url_equal != NULL, NULL);

    account_list = e_get_account_list ();
    iterator = e_list_get_iterator (E_LIST (account_list));

    while (account == NULL && e_iterator_is_valid (iterator)) {
        EAccount *candidate;
        CamelURL *curl;

        /* XXX EIterator misuses const. */
        candidate = (EAccount *) e_iterator_get (iterator);

        e_iterator_next (iterator);

        if (!account_has_source_url (candidate))
            continue;

        curl = camel_url_new (candidate->source->url, NULL);
        if (curl == NULL)
            continue;

        if (provider->url_equal (curl, source_curl))
            account = candidate;

        camel_url_free (curl);
    }

    g_object_unref (iterator);
    camel_url_free (source_curl);

    return account;
}

/**
 * e_get_account_by_transport_url:
 * @transport_url: a transport URL
 *
 * Returns the #EAccount with the given transport URL, or %NULL if no
 * such account exists.
 *
 * Returns: an #EAccount having the given transport URL, or %NULL
 **/
EAccount *
e_get_account_by_transport_url (const gchar *transport_url)
{
    EAccountList *account_list;
    EAccount *account = NULL;
    EIterator *iterator;
    CamelProvider *provider;
    CamelURL *transport_curl;

    g_return_val_if_fail (transport_url != NULL, NULL);

    transport_curl = camel_url_new (transport_url, NULL);
    g_return_val_if_fail (transport_curl != NULL, NULL);

    provider = camel_provider_get (transport_url, NULL);
    g_return_val_if_fail (provider != NULL, NULL);
    g_return_val_if_fail (provider->url_equal != NULL, NULL);

    account_list = e_get_account_list ();
    iterator = e_list_get_iterator (E_LIST (account_list));

    while (account == NULL && e_iterator_is_valid (iterator)) {
        EAccount *candidate;
        CamelURL *curl;

        /* XXX EIterator misuses const. */
        candidate = (EAccount *) e_iterator_get (iterator);

        e_iterator_next (iterator);

        if (!account_has_transport_url (candidate))
            continue;

        curl = camel_url_new (candidate->transport->url, NULL);
        if (curl == NULL)
            continue;

        if (provider->url_equal (curl, transport_curl))
            account = candidate;

        camel_url_free (curl);
    }

    g_object_unref (iterator);
    camel_url_free (transport_curl);

    return account;
}

/**
 * e_get_any_enabled_account:
 *
 * Returns the default mail account if it's enabled, otherwise the first
 * enabled mail account in the global #EAccountList, or finally %NULL if
 * all mail accounts are disabled or none exist.
 *
 * Returns: an enabled #EAccount, or %NULL if there are none
 **/
EAccount *
e_get_any_enabled_account (void)
{
    EAccount *account;
    EAccountList *account_list;
    EIterator *iter;

    account = e_get_default_account ();
    if (account != NULL && account->enabled)
        return account;

    account = NULL;

    account_list = e_get_account_list ();
    iter = e_list_get_iterator (E_LIST (account_list));

    while (e_iterator_is_valid (iter) && account == NULL) {
        EAccount *candidate;

        /* XXX EIterator misuses const. */
        candidate = (EAccount *) e_iterator_get (iter);

        if (candidate->enabled)
            account = candidate;
        else
            e_iterator_next (iter);
    }

    g_object_unref (iter);

    return account;
}

/**
 * e_get_default_transport:
 *
 * Returns transport information for the default account if it's enabled and
 * has transport information, or else from the first enabled mail account in
 * the global #EAccountList that has transport information, or finally %NULL
 * if no transport information could be found.
 *
 * Returns: an #EAccount with transport info, or %NULL
 **/
EAccount *
e_get_default_transport (void)
{
    EAccountList *account_list;
    EAccount *account;
    EIterator *iterator;

    account = e_get_default_account ();
    if (account_has_transport_url (account))
        return account;

    account_list = e_get_account_list ();
    iterator = e_list_get_iterator (E_LIST (account_list));

    while (e_iterator_is_valid (iterator)) {
        /* XXX EIterator misuses const. */
        account = (EAccount *) e_iterator_get (iterator);
        if (account_has_transport_url (account)) {
            g_object_unref (iterator);
            return account;
        }
        e_iterator_next (iterator);
    }

    g_object_unref (iterator);

    return NULL;
}

/**
 * e_get_subscribable_accounts:
 * @session: a #CamelSession
 *
 * Returns a list of enabled accounts that support folder subscriptions.
 * The #EAccount objects are not referenced, but the list itself should
 * be should be freed with g_list_free().
 *
 * Returns: a list of #EAccount objects
 **/
GList *
e_get_subscribable_accounts (CamelSession *session)
{
    EAccountList *account_list;
    EAccount *account;
    EIterator *iterator;
    GList *subscribable = NULL;

    g_return_val_if_fail (CAMEL_IS_SESSION (session), NULL);

    account_list = e_get_account_list ();
    iterator = e_list_get_iterator (E_LIST (account_list));

    while (e_iterator_is_valid (iterator)) {
        CamelStore *store = NULL;

        /* XXX EIterator misuses const. */
        account = (EAccount *) e_iterator_get (iterator);

        if (account->enabled) {
            CamelService *service;
            const gchar *url;

            url = e_account_get_string (
                account, E_ACCOUNT_SOURCE_URL);
            service = camel_session_get_service (
                session, account->uid);
            if (CAMEL_IS_STORE (service))
                store = CAMEL_STORE (service);
        }

        e_iterator_next (iterator);

        if (store == NULL)
            continue;

        if (!camel_store_supports_subscriptions (store))
            continue;

        subscribable = g_list_prepend (subscribable, account);
    }

    g_object_unref (iterator);

    return g_list_reverse (subscribable);
}