/*
 * Copyright (C) 2019 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 "s1ap-path.h"
#include "nas-path.h"
#include "mme-gtp-path.h"
#include "mme-path.h"

void mme_send_delete_session_or_detach(mme_ue_t *mme_ue)
{
    ogs_assert(mme_ue);

    if (SESSION_CONTEXT_IS_AVAILABLE(mme_ue)) {
        mme_gtp_send_delete_all_sessions(mme_ue);
    } else {
        nas_eps_send_detach_accept(mme_ue);
    }
}

void mme_send_delete_session_or_mme_ue_context_release(mme_ue_t *mme_ue)
{
    ogs_assert(mme_ue);

    if (SESSION_CONTEXT_IS_AVAILABLE(mme_ue)) {
        mme_gtp_send_delete_all_sessions(mme_ue);
    } else {
        enb_ue_t *enb_ue = mme_ue->enb_ue;
        if (enb_ue) {
            s1ap_send_ue_context_release_command(enb_ue,
                    S1AP_Cause_PR_nas, S1AP_CauseNas_normal_release,
                    S1AP_UE_CTX_REL_UE_CONTEXT_REMOVE, 0);
        } else {
            ogs_warn("[%s] No S1 Context", mme_ue->imsi_bcd);
        }
    }
}

#if 0
void mme_send_release_access_bearer_or_ue_context_release(enb_ue_t *enb_ue)
{
    mme_ue_t *mme_ue = NULL;
    ogs_assert(enb_ue);

    mme_ue = enb_ue->mme_ue;
    if (mme_ue && BEARER_CONTEXT_IS_ACTIVE(mme_ue)) {
        ogs_debug("[%s] Release access bearer request", mme_ue->imsi_bcd);
        mme_gtp_send_release_access_bearers_request(mme_ue);
    } else {
        ogs_debug("[%s] No UE Context", mme_ue->imsi_bcd);
        s1ap_send_ue_context_release_command(enb_ue,
                S1AP_Cause_PR_nas, S1AP_CauseNas_normal_release,
                S1AP_UE_CTX_REL_S1_CONTEXT_REMOVE, 0);
    }
}
#else
void mme_send_delete_session_or_enb_ue_context_release(enb_ue_t *enb_ue)
{
    mme_ue_t *mme_ue = NULL;
    ogs_assert(enb_ue);

    mme_ue = enb_ue->mme_ue;
    if (mme_ue && SESSION_CONTEXT_IS_AVAILABLE(mme_ue)) {
        mme_gtp_send_delete_all_sessions(mme_ue);
    } else {
        s1ap_send_ue_context_release_command(enb_ue,
                S1AP_Cause_PR_nas, S1AP_CauseNas_normal_release,
                S1AP_UE_CTX_REL_S1_CONTEXT_REMOVE, 0);
    }
}

void mme_send_release_access_bearer_or_ue_context_release(enb_ue_t *enb_ue)
{
    mme_ue_t *mme_ue = NULL;
    ogs_assert(enb_ue);

    mme_ue = enb_ue->mme_ue;
    if (mme_ue) {
        if (BEARER_CONTEXT_IS_ACTIVE(mme_ue)) {
            ogs_debug("[%s] EMM-Registered", mme_ue->imsi_bcd);
            mme_gtp_send_release_access_bearers_request(mme_ue);
        } else {
            ogs_warn("[%s] No EMM-Registered", mme_ue->imsi_bcd);
            mme_send_delete_session_or_mme_ue_context_release(mme_ue);
        }
    } else {
        ogs_debug("No UE Context");
        s1ap_send_ue_context_release_command(enb_ue,
                S1AP_Cause_PR_nas, S1AP_CauseNas_normal_release,
                S1AP_UE_CTX_REL_S1_CONTEXT_REMOVE, 0);
    }
}
#endif