/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

#include <assert.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include "os/mynewt.h"
#include <bsp/bsp.h>
#include <hal/hal_gpio.h>
#include <console/console.h>
#include <mgmt/mgmt.h>

#include <oic/oc_api.h>
#include <oic/oc_gatt.h>
#include <cborattr/cborattr.h>

/* BLE */
#include <nimble/ble.h>
#include <host/ble_hs.h>
#include <services/gap/ble_svc_gap.h>

/* Application-specified header. */
#include "bleprph.h"

static int bleprph_gap_event(struct ble_gap_event *event, void *arg);

/**
 * Logs information about a connection to the console.
 */
static void
bleprph_print_conn_desc(struct ble_gap_conn_desc *desc)
{
    MODLOG_DFLT(INFO, "handle=%d our_ota_addr_type=%d our_ota_addr=",
                desc->conn_handle, desc->our_ota_addr.type);
    print_addr(desc->our_ota_addr.val);
    MODLOG_DFLT(INFO, " our_id_addr_type=%d our_id_addr=",
                desc->our_id_addr.type);
    print_addr(desc->our_id_addr.val);
    MODLOG_DFLT(INFO, " peer_ota_addr_type=%d peer_ota_addr=",
                desc->peer_ota_addr.type);
    print_addr(desc->peer_ota_addr.val);
    MODLOG_DFLT(INFO, " peer_id_addr_type=%d peer_id_addr=",
                desc->peer_id_addr.type);
    print_addr(desc->peer_id_addr.val);
    MODLOG_DFLT(INFO, " conn_itvl=%d conn_latency=%d supervision_timeout=%d "
                "encrypted=%d authenticated=%d bonded=%d\n",
                desc->conn_itvl, desc->conn_latency,
                desc->supervision_timeout,
                desc->sec_state.encrypted,
                desc->sec_state.authenticated,
                desc->sec_state.bonded);
}

/**
 * Enables advertising with the following parameters:
 *     o General discoverable mode.
 *     o Undirected connectable mode.
 */
static void
bleprph_advertise(void)
{
    struct ble_gap_adv_params adv_params;
    struct ble_hs_adv_fields fields;
    const char *name;
    int rc;

    /**
     *  Set the advertisement data included in our advertisements:
     *     o Flags (indicates advertisement type and other general info).
     *     o Advertising tx power.
     *     o Device name.
     *     o service UUID.
     */

    memset(&fields, 0, sizeof fields);

    /* Advertise two flags:
     *     o Discoverability in forthcoming advertisement (general)
     *     o BLE-only (BR/EDR unsupported).
     */
    fields.flags = BLE_HS_ADV_F_DISC_GEN |
                   BLE_HS_ADV_F_BREDR_UNSUP;

    /* Indicate that the TX power level field should be included; have the
     * stack fill this value automatically.  This is done by assiging the
     * special value BLE_HS_ADV_TX_PWR_LVL_AUTO.
     */
    fields.tx_pwr_lvl_is_present = 1;
    fields.tx_pwr_lvl = BLE_HS_ADV_TX_PWR_LVL_AUTO;

    name = ble_svc_gap_device_name();
    fields.name = (uint8_t *)name;
    fields.name_len = strlen(name);
    fields.name_is_complete = 1;

#if MYNEWT_VAL(ADVERTISE_128BIT_UUID)
    /* Advertise the 128-bit CoAP-over-BLE service UUID in the scan response. */
    fields.uuids128 = (ble_uuid128_t []) {
        BLE_UUID128_INIT(OC_GATT_UNSEC_SVC_UUID)
    };
    fields.num_uuids128 = 1;
    fields.uuids128_is_complete = 1;
#endif
#if MYNEWT_VAL(ADVERTISE_16BIT_UUID)
    /* Advertise the 16-bit CoAP-over-BLE service UUID in the scan response. */
    fields.uuids16 = (ble_uuid16_t[]) {
        BLE_UUID16_INIT(OC_GATT_SEC_SVC_UUID)
    };
    fields.num_uuids16 = 1;
    fields.uuids16_is_complete = 1;
#endif
    rc = ble_gap_adv_set_fields(&fields);
    if (rc != 0) {
        MODLOG_DFLT(ERROR, "error setting advertisement data; rc=%d\n", rc);
        return;
    }

    /* Begin advertising. */
    memset(&adv_params, 0, sizeof adv_params);
    adv_params.conn_mode = BLE_GAP_CONN_MODE_UND;
    adv_params.disc_mode = BLE_GAP_DISC_MODE_GEN;
    rc = ble_gap_adv_start(BLE_OWN_ADDR_PUBLIC, NULL, BLE_HS_FOREVER,
                           &adv_params, bleprph_gap_event, NULL);
    if (rc != 0) {
        MODLOG_DFLT(ERROR, "error enabling advertisement; rc=%d\n", rc);
        return;
    }
}

/**
 * The nimble host executes this callback when a GAP event occurs.  The
 * application associates a GAP event callback with each connection that forms.
 * bleprph uses the same callback for all connections.
 *
 * @param event                 The type of event being signalled.
 * @param ctxt                  Various information pertaining to the event.
 * @param arg                   Application-specified argument; unuesd by
 *                                  bleprph.
 *
 * @return                      0 if the application successfully handled the
 *                                  event; nonzero on failure.  The semantics
 *                                  of the return code is specific to the
 *                                  particular GAP event being signalled.
 */
static int
bleprph_gap_event(struct ble_gap_event *event, void *arg)
{
    struct ble_gap_conn_desc desc;
    int rc;

    switch (event->type) {
    case BLE_GAP_EVENT_CONNECT:
        /* A new connection was established or a connection attempt failed. */
        MODLOG_DFLT(INFO, "connection %s; status=%d ",
                    event->connect.status == 0 ? "established" : "failed",
                    event->connect.status);
        if (event->connect.status == 0) {
            rc = ble_gap_conn_find(event->connect.conn_handle, &desc);
            assert(rc == 0);
            bleprph_print_conn_desc(&desc);
        }
        MODLOG_DFLT(INFO, "\n");

        if (event->connect.status != 0) {
            /* Connection failed; resume advertising. */
            bleprph_advertise();
        } else {
            oc_ble_coap_conn_new(event->connect.conn_handle);
        }
        return 0;

    case BLE_GAP_EVENT_DISCONNECT:
        MODLOG_DFLT(INFO, "disconnect; reason=%d ", event->disconnect.reason);
        bleprph_print_conn_desc(&event->disconnect.conn);
        MODLOG_DFLT(INFO, "\n");

        oc_ble_coap_conn_del(event->disconnect.conn.conn_handle);

        /* Connection terminated; resume advertising. */
        bleprph_advertise();
        return 0;

    case BLE_GAP_EVENT_CONN_UPDATE:
        /* The central has updated the connection parameters. */
        MODLOG_DFLT(INFO, "connection updated; status=%d ",
                    event->conn_update.status);
        rc = ble_gap_conn_find(event->connect.conn_handle, &desc);
        assert(rc == 0);
        bleprph_print_conn_desc(&desc);
        MODLOG_DFLT(INFO, "\n");
        return 0;

    case BLE_GAP_EVENT_ADV_COMPLETE:
        MODLOG_DFLT(INFO, "advertise complete; reason=%d\n",
                    event->adv_complete.reason);
        bleprph_advertise();
        return 0;

    case BLE_GAP_EVENT_ENC_CHANGE:
        /* Encryption has been enabled or disabled for this connection. */
        MODLOG_DFLT(INFO, "encryption change event; status=%d ",
                    event->enc_change.status);
        rc = ble_gap_conn_find(event->connect.conn_handle, &desc);
        assert(rc == 0);
        bleprph_print_conn_desc(&desc);
        MODLOG_DFLT(INFO, "\n");
        return 0;

    case BLE_GAP_EVENT_SUBSCRIBE:
        MODLOG_DFLT(INFO, "subscribe event; conn_handle=%d attr_handle=%d "
                          "reason=%d prevn=%d curn=%d previ=%d curi=%d\n",
                    event->subscribe.conn_handle,
                    event->subscribe.attr_handle,
                    event->subscribe.reason,
                    event->subscribe.prev_notify,
                    event->subscribe.cur_notify,
                    event->subscribe.prev_indicate,
                    event->subscribe.cur_indicate);
        return 0;

    case BLE_GAP_EVENT_MTU:
        MODLOG_DFLT(INFO, "mtu update event; conn_handle=%d cid=%d mtu=%d\n",
                    event->mtu.conn_handle,
                    event->mtu.channel_id,
                    event->mtu.value);
        return 0;

    case BLE_GAP_EVENT_REPEAT_PAIRING:
        /* We already have a bond with the peer, but it is attempting to
         * establish a new secure link.  This app sacrifices security for
         * convenience: just throw away the old bond and accept the new link.
         */

        /* Delete the old bond. */
        rc = ble_gap_conn_find(event->repeat_pairing.conn_handle, &desc);
        assert(rc == 0);
        ble_store_util_delete_peer(&desc.peer_id_addr);

        /* Return BLE_GAP_REPEAT_PAIRING_RETRY to indicate that the host should
         * continue with the pairing operation.
         */
        return BLE_GAP_REPEAT_PAIRING_RETRY;
    }

    return 0;
}

static void
bleprph_on_reset(int reason)
{
    MODLOG_DFLT(ERROR, "Resetting state; reason=%d\n", reason);
}

static void
bleprph_on_sync(void)
{
    /* Begin advertising. */
    bleprph_advertise();
}

static void
app_get_light(oc_request_t *request, oc_interface_mask_t interface)
{
    bool value;

    if (hal_gpio_read(LED_BLINK_PIN)) {
        value = true;
    } else {
        value = false;
    }
    oc_rep_start_root_object();
    switch (interface) {
    case OC_IF_BASELINE:
        oc_process_baseline_interface(request->resource);
    case OC_IF_A:
        oc_rep_set_boolean(root, value, value);
        break;
    default:
        break;
    }
    oc_rep_end_root_object();
    oc_send_response(request, OC_STATUS_OK);
}

static void
app_set_light(oc_request_t *request, oc_interface_mask_t interface)
{
    bool value;
    int len;
    uint16_t data_off;
    struct os_mbuf *m;
    struct cbor_attr_t attrs[] = {
        [0] = {
            .attribute = "value",
            .type = CborAttrBooleanType,
            .addr.boolean = &value,
            .dflt.boolean = false
        },
        [1] = {
        }
    };

    len = coap_get_payload(request->packet, &m, &data_off);
    if (cbor_read_mbuf_attrs(m, data_off, len, attrs)) {
        oc_send_response(request, OC_STATUS_BAD_REQUEST);
    } else {
        hal_gpio_write(LED_BLINK_PIN, value == true);
        oc_send_response(request, OC_STATUS_CHANGED);
    }
}

static void
omgr_app_init(void)
{
    oc_resource_t *res;

    oc_init_platform("MyNewt", NULL, NULL);
    oc_add_device("/oic/d", "oic.d.light", "MynewtLed", "1.0", "1.0", NULL,
                  NULL);

    res = oc_new_resource("/light/1", 1, 0);
    oc_resource_bind_resource_type(res, "oic.r.switch.binary");
    oc_resource_bind_resource_interface(res, OC_IF_A);
    oc_resource_set_default_interface(res, OC_IF_A);

    oc_resource_set_discoverable(res);
    oc_resource_set_periodic_observable(res, 1);
    oc_resource_set_request_handler(res, OC_GET, app_get_light);
    oc_resource_set_request_handler(res, OC_PUT, app_set_light);
    oc_resource_set_request_handler(res, OC_POST, app_set_light);
    oc_add_resource(res);

}

static const oc_handler_t omgr_oc_handler = {
    .init = omgr_app_init,
};

/**
 * main
 *
 * The main task for the project. This function initializes the packages,
 * then starts serving events from default event queue.
 *
 * @return int NOTE: this function should never return!
 */
int
main(void)
{
    int rc;

    /* Set initial BLE device address. */
    memcpy(g_dev_addr, (uint8_t[6]){0x0a, 0xfa, 0xcf, 0xac, 0xfa, 0xc0}, 6);

    /* Initialize OS */
    sysinit();

    /* Initialize the OIC  */
    oc_main_init((oc_handler_t *)&omgr_oc_handler);
    oc_ble_coap_gatt_srv_init();

    ble_hs_cfg.reset_cb = bleprph_on_reset;
    ble_hs_cfg.sync_cb = bleprph_on_sync;
    ble_hs_cfg.gatts_register_cb = gatt_svr_register_cb;
    ble_hs_cfg.store_status_cb = ble_store_util_status_rr;

    /* Set the default device name. */
    rc = ble_svc_gap_device_name_set("c5");
    assert(rc == 0);

    /* Our light resource */
    hal_gpio_init_out(LED_BLINK_PIN, 1);

    while (1) {
        os_eventq_run(os_eventq_dflt_get());
    }
    /* Never exit */

    return 0;
}