/*
 * roster.c
 * vim: expandtab:ts=4:sts=4:sw=4
 *
 * Copyright (C) 2012 - 2019 James Booth <boothj5@gmail.com>
 *
 * This file is part of Profani-tty.
 *
 * Profani-tty is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Profani-tty 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 Profani-tty.  If not, see <https://www.gnu.org/licenses/>.
 *
 * In addition, as a special exception, the copyright holders give permission to
 * link the code of portions of this program with the OpenSSL library under
 * certain conditions as described in each individual source file, and
 * distribute linked combinations including the two.
 *
 * You must obey the GNU General Public License in all respects for all of the
 * code used other than OpenSSL. If you modify file(s) with this exception, you
 * may extend this exception to your version of the file(s), but you are not
 * obligated to do so. If you do not wish to do so, delete this exception
 * statement from your version. If you delete this exception statement from all
 * source files in the program, then also delete it here.
 *
 */

#include "config.h"

#include <assert.h>
#include <stdlib.h>
#include <string.h>

#include <glib.h>

#include <strophe.h>

#include "profani-tty.h"
#include "log.h"
#include "config/preferences.h"
#include "plugins/plugins.h"
#include "event/server_events.h"
#include "event/client_events.h"
#include "tools/autocomplete.h"
#include "ui/ui.h"
#include "xmpp/session.h"
#include "xmpp/iq.h"
#include "xmpp/connection.h"
#include "xmpp/roster.h"
#include "xmpp/roster_list.h"
#include "xmpp/stanza.h"
#include "xmpp/xmpp.h"

// callback data for group commands
typedef struct _group_data
{
    char* name;
    char* group;
} GroupData;

// id handlers
static int _group_add_id_handler(xmpp_stanza_t* const stanza, void* const userdata);
static int _group_remove_id_handler(xmpp_stanza_t* const stanza, void* const userdata);
static void _free_group_data(GroupData* data);

void
roster_request(void)
{
    xmpp_ctx_t* const ctx = connection_get_ctx();
    xmpp_stanza_t* iq = stanza_create_roster_iq(ctx);
    iq_send_stanza(iq);
    xmpp_stanza_release(iq);
}

void
roster_send_add_new(const char* const barejid, const char* const name)
{
    xmpp_ctx_t* const ctx = connection_get_ctx();
    char* id = connection_create_stanza_id();
    xmpp_stanza_t* iq = stanza_create_roster_set(ctx, id, barejid, name, NULL);
    free(id);
    iq_send_stanza(iq);
    xmpp_stanza_release(iq);
}

void
roster_send_remove(const char* const barejid)
{
    xmpp_ctx_t* const ctx = connection_get_ctx();
    xmpp_stanza_t* iq = stanza_create_roster_remove_set(ctx, barejid);
    iq_send_stanza(iq);
    xmpp_stanza_release(iq);
}

void
roster_send_name_change(const char* const barejid, const char* const new_name, GSList* groups)
{
    xmpp_ctx_t* const ctx = connection_get_ctx();
    char* id = connection_create_stanza_id();
    xmpp_stanza_t* iq = stanza_create_roster_set(ctx, id, barejid, new_name, groups);
    free(id);
    iq_send_stanza(iq);
    xmpp_stanza_release(iq);
}

void
roster_send_add_to_group(const char* const group, PContact contact)
{
    GSList* groups = p_contact_groups(contact);
    GSList* new_groups = NULL;
    while (groups) {
        new_groups = g_slist_append(new_groups, strdup(groups->data));
        groups = g_slist_next(groups);
    }

    new_groups = g_slist_append(new_groups, strdup(group));
    // add an id handler to handle the response
    char* unique_id = connection_create_stanza_id();
    GroupData* data = malloc(sizeof(GroupData));
    data->group = strdup(group);
    if (p_contact_name(contact)) {
        data->name = strdup(p_contact_name(contact));
    } else {
        data->name = strdup(p_contact_barejid(contact));
    }

    xmpp_ctx_t* const ctx = connection_get_ctx();
    iq_id_handler_add(unique_id, _group_add_id_handler, (ProfIqFreeCallback)_free_group_data, data);
    xmpp_stanza_t* iq = stanza_create_roster_set(ctx, unique_id, p_contact_barejid(contact),
                                                 p_contact_name(contact), new_groups);
    iq_send_stanza(iq);
    xmpp_stanza_release(iq);
    free(unique_id);
}

static int
_group_add_id_handler(xmpp_stanza_t* const stanza, void* const userdata)
{
    if (userdata) {
        GroupData* data = userdata;
        ui_group_added(data->name, data->group);
    }
    return 0;
}

void
roster_send_remove_from_group(const char* const group, PContact contact)
{
    GSList* groups = p_contact_groups(contact);
    GSList* new_groups = NULL;
    while (groups) {
        if (strcmp(groups->data, group) != 0) {
            new_groups = g_slist_append(new_groups, strdup(groups->data));
        }
        groups = g_slist_next(groups);
    }

    xmpp_ctx_t* const ctx = connection_get_ctx();

    // add an id handler to handle the response
    char* unique_id = connection_create_stanza_id();
    GroupData* data = malloc(sizeof(GroupData));
    data->group = strdup(group);
    if (p_contact_name(contact)) {
        data->name = strdup(p_contact_name(contact));
    } else {
        data->name = strdup(p_contact_barejid(contact));
    }

    iq_id_handler_add(unique_id, _group_remove_id_handler, (ProfIqFreeCallback)_free_group_data, data);
    xmpp_stanza_t* iq = stanza_create_roster_set(ctx, unique_id, p_contact_barejid(contact),
                                                 p_contact_name(contact), new_groups);
    iq_send_stanza(iq);
    xmpp_stanza_release(iq);
    free(unique_id);
}

static int
_group_remove_id_handler(xmpp_stanza_t* const stanza, void* const userdata)
{
    if (userdata) {
        GroupData* data = userdata;
        ui_group_removed(data->name, data->group);
    }
    return 0;
}

void
roster_set_handler(xmpp_stanza_t* const stanza)
{
    xmpp_stanza_t* query = xmpp_stanza_get_child_by_name(stanza, STANZA_NAME_QUERY);
    xmpp_stanza_t* item = xmpp_stanza_get_child_by_name(query, STANZA_NAME_ITEM);

    if (item == NULL) {
        return;
    }

    // if from attribute exists and it is not current users barejid, ignore push
    char* mybarejid = connection_get_barejid();
    const char* from = xmpp_stanza_get_from(stanza);
    if (from && (strcmp(from, mybarejid) != 0)) {
        log_warning("Received alleged roster push from: %s", from);
        free(mybarejid);
        return;
    }
    free(mybarejid);

    const char* barejid = xmpp_stanza_get_attribute(item, STANZA_ATTR_JID);
    gchar* barejid_lower = g_utf8_strdown(barejid, -1);
    const char* name = xmpp_stanza_get_attribute(item, STANZA_ATTR_NAME);
    const char* sub = xmpp_stanza_get_attribute(item, STANZA_ATTR_SUBSCRIPTION);
    const char* ask = xmpp_stanza_get_attribute(item, STANZA_ATTR_ASK);

    // do not set nickname to empty string, set to NULL instead
    if (name && (strlen(name) == 0)) {
        name = NULL;
    }

    // remove from roster
    if (g_strcmp0(sub, "remove") == 0) {
        // remove barejid and name
        if (name == NULL) {
            name = barejid_lower;
        }
        roster_remove(name, barejid_lower);
        ui_roster_remove(barejid_lower);

        // otherwise update local roster
    } else {

        // check for pending out subscriptions
        gboolean pending_out = FALSE;
        if (ask && (strcmp(ask, "subscribe") == 0)) {
            pending_out = TRUE;
        }

        GSList* groups = roster_get_groups_from_item(item);

        // update the local roster
        PContact contact = roster_get_contact(barejid_lower);
        if (contact == NULL) {
            gboolean added = roster_add(barejid_lower, name, groups, sub, pending_out);
            if (added) {
                ui_roster_add(barejid_lower, name);
            }
        } else {
            sv_ev_roster_update(barejid_lower, name, groups, sub, pending_out);
        }
    }

    g_free(barejid_lower);

    return;
}

void
roster_result_handler(xmpp_stanza_t* const stanza)
{
    const char* id = xmpp_stanza_get_id(stanza);

    if (g_strcmp0(id, "roster") != 0) {
        return;
    }

    // handle initial roster response
    xmpp_stanza_t* query = xmpp_stanza_get_child_by_name(stanza, STANZA_NAME_QUERY);
    xmpp_stanza_t* item = xmpp_stanza_get_children(query);

    while (item) {
        const char* barejid = xmpp_stanza_get_attribute(item, STANZA_ATTR_JID);
        gchar* barejid_lower = g_utf8_strdown(barejid, -1);
        const char* name = xmpp_stanza_get_attribute(item, STANZA_ATTR_NAME);
        const char* sub = xmpp_stanza_get_attribute(item, STANZA_ATTR_SUBSCRIPTION);

        // do not set nickname to empty string, set to NULL instead
        if (name && (strlen(name) == 0))
            name = NULL;

        gboolean pending_out = FALSE;
        const char* ask = xmpp_stanza_get_attribute(item, STANZA_ATTR_ASK);
        if (g_strcmp0(ask, "subscribe") == 0) {
            pending_out = TRUE;
        }

        GSList* groups = roster_get_groups_from_item(item);

        gboolean added = roster_add(barejid_lower, name, groups, sub, pending_out);
        if (!added) {
            log_warning("Attempt to add contact twice: %s", barejid_lower);
        }

        g_free(barejid_lower);
        item = xmpp_stanza_get_next(item);
    }

    sv_ev_roster_received();

    return;
}

GSList*
roster_get_groups_from_item(xmpp_stanza_t* item)
{
    GSList* groups = NULL;
    xmpp_stanza_t* group_element = xmpp_stanza_get_children(item);

    while (group_element) {
        if (strcmp(xmpp_stanza_get_name(group_element), STANZA_NAME_GROUP) == 0) {
            char* groupname = xmpp_stanza_get_text(group_element);
            if (groupname) {
                groups = g_slist_append(groups, groupname);
            }
        }
        group_element = xmpp_stanza_get_next(group_element);
    }

    return groups;
}

static void
_free_group_data(GroupData* data)
{
    if (data) {
        free(data->group);
        free(data->name);
        free(data);
    }
}