/*
 * Copyright (C) 2019,2020 by Sukchan Lee <acetcom@gmail.com>
 *
 * This file is part of Open5GS.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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, see <https://www.gnu.org/licenses/>.
 */

#include "context.h"
#include "sbi-path.h"

static int server_cb(ogs_sbi_server_t *server,
        ogs_sbi_session_t *session, ogs_sbi_request_t *request)
{
    amf_event_t *e = NULL;
    int rv;

    ogs_assert(session);
    ogs_assert(request);

    e = amf_event_new(AMF_EVT_SBI_SERVER);
    ogs_assert(e);

    e->sbi.server = server;
    e->sbi.session = session;
    e->sbi.request = request;

    rv = ogs_queue_push(amf_self()->queue, e);
    if (rv != OGS_OK) {
        ogs_warn("ogs_queue_push() failed:%d", (int)rv);
        amf_event_free(e);
        return OGS_ERROR;
    }

    return OGS_OK;
}

static int client_cb(ogs_sbi_response_t *response, void *data)
{
    amf_event_t *e = NULL;
    int rv;

    ogs_assert(response);

    e = amf_event_new(AMF_EVT_SBI_CLIENT);
    ogs_assert(e);
    e->sbi.response = response;
    e->sbi.data = data;

    rv = ogs_queue_push(amf_self()->queue, e);
    if (rv != OGS_OK) {
        ogs_warn("ogs_queue_push() failed:%d", (int)rv);
        amf_event_free(e);
        return OGS_ERROR;
    }

    return OGS_OK;
}

int amf_sbi_open(void)
{
    ogs_sbi_nf_instance_t *nf_instance = NULL;
    ogs_sbi_client_t *client = NULL;

    ogs_sbi_server_start_all(server_cb);

    ogs_list_for_each(&ogs_sbi_self()->client_list, client) {
        ogs_sbi_nf_service_t *service = NULL;

        nf_instance = ogs_sbi_nf_instance_build_default(
                amf_self()->nf_type, client);
        ogs_assert(nf_instance);

        service = ogs_sbi_nf_service_build_default(nf_instance,
                (char*)OGS_SBI_SERVICE_NAME_SMF_PDUSESSION, client);
        ogs_assert(service);
        ogs_sbi_nf_service_add_version(service, (char*)OGS_SBI_API_VERSION,
                (char*)OGS_SBI_API_FULL_VERSION, NULL);

        amf_sbi_nf_associate_client(nf_instance, client);
        amf_nf_fsm_init(nf_instance);
    }

    return OGS_OK;
}

void amf_sbi_close(void)
{
    ogs_sbi_server_stop_all();
}

void amf_sbi_nf_associate_client(
        ogs_sbi_nf_instance_t *nf_instance, ogs_sbi_client_t *client)
{
    ogs_assert(nf_instance);
    ogs_assert(client);

    OGS_SETUP_SBI_CLIENT(nf_instance, client);
    client->cb = client_cb;
}

void amf_sbi_send_nf_register(ogs_sbi_nf_instance_t *nf_instance)
{
    ogs_sbi_request_t *request = NULL;
    ogs_sbi_client_t *client = NULL;

    ogs_assert(nf_instance);
    client = nf_instance->client;
    ogs_assert(client);

    request = amf_nnrf_build_nf_register(nf_instance);
    ogs_assert(request);
    ogs_sbi_client_send_request(client, request, nf_instance);
}

void amf_sbi_send_nf_update(ogs_sbi_nf_instance_t *nf_instance)
{
    ogs_sbi_request_t *request = NULL;
    ogs_sbi_client_t *client = NULL;

    ogs_assert(nf_instance);
    client = nf_instance->client;
    ogs_assert(client);

    request = amf_nnrf_build_nf_update(nf_instance);
    ogs_assert(request);
    ogs_sbi_client_send_request(client, request, nf_instance);
}

void amf_sbi_send_nf_de_register(ogs_sbi_nf_instance_t *nf_instance)
{
    ogs_sbi_request_t *request = NULL;
    ogs_sbi_client_t *client = NULL;

    ogs_assert(nf_instance);
    client = nf_instance->client;
    ogs_assert(client);

    request = amf_nnrf_build_nf_de_register(nf_instance);
    ogs_assert(request);
    ogs_sbi_client_send_request(client, request, nf_instance);
}

void amf_sbi_send_nf_status_subscribe(ogs_sbi_client_t *client,
        OpenAPI_nf_type_e nf_type, char *nf_instance_id)
{
    ogs_sbi_request_t *request = NULL;
    ogs_sbi_subscription_t *subscription = NULL;

    ogs_assert(client);

    subscription = ogs_sbi_subscription_add();
    ogs_assert(subscription);
    subscription->client = client;
    subscription->nf_type = nf_type;
    if (nf_instance_id)
        subscription->nf_instance_id = ogs_strdup(nf_instance_id);

    request = amf_nnrf_build_nf_status_subscribe(subscription);
    ogs_assert(request);
    ogs_sbi_client_send_request(client, request, subscription);
}

void amf_sbi_send_nf_status_unsubscribe(ogs_sbi_subscription_t *subscription)
{
    ogs_sbi_request_t *request = NULL;
    ogs_sbi_client_t *client = NULL;

    ogs_assert(subscription);
    client = subscription->client;
    ogs_assert(client);

    request = amf_nnrf_build_nf_status_unsubscribe(subscription);
    ogs_assert(request);
    ogs_sbi_client_send_request(client, request, subscription);
}

void amf_sbi_send_nf_discover(ogs_sbi_client_t *client,
        OpenAPI_nf_type_e target_nf_type, OpenAPI_nf_type_e requester_nf_type)
{
    ogs_sbi_request_t *request = NULL;

    ogs_assert(client);

    request = amf_nnrf_build_nf_discover(target_nf_type, requester_nf_type);
    ogs_assert(request);
    ogs_sbi_client_send_request(client, request, NULL);
}