/*
 * Copyright (C) 2017 Freie Universität Berlin
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */

/**
 * @ingroup     examples
 * @{
 *
 * @file
 * @brief       Test application demonstrating the simple registration
 *              process to a CoRE RD using gcoap
 *
 * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
 *
 * @}
 */

#include <stdio.h>

#include "shell.h"
#include "net/gcoap.h"
#include "net/cord/common.h"

#define BUFSIZE             (64U)

static char riot_info[BUFSIZE];

/* define some dummy CoAP resources */
static ssize_t text_resp(coap_pkt_t *pdu, uint8_t *buf, size_t len,
                         const char *text, unsigned format)
{
    gcoap_resp_init(pdu, buf, len, COAP_CODE_CONTENT);
    coap_opt_add_format(pdu, format);
    ssize_t resp_len = coap_opt_finish(pdu, COAP_OPT_FINISH_PAYLOAD);
    size_t slen = strlen(text);
    memcpy(pdu->payload, text, slen);
    return resp_len + slen;
}

static ssize_t handler_info(coap_pkt_t *pdu, uint8_t *buf, size_t len, void *ctx)
{
    (void)ctx;
    return text_resp(pdu, buf, len, riot_info, COAP_FORMAT_JSON);
}

static ssize_t handler_text(coap_pkt_t *pdu, uint8_t *buf, size_t len, void *ctx)
{
    return text_resp(pdu, buf, len, (char *)ctx, COAP_FORMAT_TEXT);
}

static const coap_resource_t resources[] = {
    { "/riot/bar",  COAP_GET, handler_text, "foo" },
    { "/riot/foo",  COAP_GET, handler_text, "bar" },
    { "/riot/info", COAP_GET, handler_info, NULL }
};

static gcoap_listener_t listener = {
    .resources     = &resources[0],
    .resources_len = sizeof(resources) / sizeof(resources[0]),
    .next          = NULL
};

int main(void)
{
    puts("CoAP simplified RD registration example!\n");

    /* fill riot info */
    sprintf(riot_info, "{\"ep\":\"%s\",\"lt\":%u}",
            cord_common_get_ep(), CORD_LT);

    /* register resource handlers with gcoap */
    gcoap_register_listener(&listener);

    /* print RD client information */
    puts("RD client information:");
    printf(" RD addr: %s\n", CORD_SERVER_ADDR);
    printf(" RD port: %u\n", (unsigned)CORD_SERVER_PORT);
    printf("      ep: %s\n", cord_common_get_ep());
    printf("      lt: %is\n", (int)CORD_LT);

    /* run the shell */
    char line_buf[SHELL_DEFAULT_BUFSIZE];
    shell_run(NULL, line_buf, SHELL_DEFAULT_BUFSIZE);

    return 0;
}