/*
 * Copyright (c) 2016 Intel Corporation
 *
 * Copyright (c) 2013, Institute for Pervasive Computing, ETH Zurich
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * This file is part of the Contiki operating system.
 */

#ifndef CONSTANTS_H
#define CONSTANTS_H

#ifdef __cplusplus
extern "C" {
#endif

#define COAP_DEFAULT_PORT 5683

#define COAP_DEFAULT_MAX_AGE 60
#define COAP_RESPONSE_TIMEOUT MYNEWT_VAL(OC_COAP_RESPONSE_TIMEOUT)
#define COAP_RESPONSE_RANDOM_FACTOR 1.5
#define COAP_MAX_RETRANSMIT 4

#define COAP_HEADER_LEN                                                        \
  4 /* | version:0x03 type:0x0C tkl:0xF0 | code | mid:0x00FF | mid:0xFF00 | */
#define COAP_TOKEN_LEN 8 /* The maximum number of bytes for the Token */
#define COAP_ETAG_LEN 8  /* The maximum number of bytes for the ETag */
#define COAP_MAX_URI         32 /* The max number of bytes for URI */
#define COAP_MAX_URI_QUERY   32 /* The max number of bytes for URI-query */

/*
 * Standard COAP header
 */
struct coap_udp_hdr {
#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
    uint8_t  version:2;         /* protocol version */
    uint8_t  type:2;            /* type flag */
    uint8_t  token_len:4;       /* length of token */
#else
    uint8_t  token_len:4;       /* length of token */
    uint8_t  type:2;            /* type flag */
    uint8_t  version:2;         /* protocol version */
#endif
    uint8_t  code;              /* request (1-10) or response (value 40-255) */
    uint16_t id;                /* transaction id */
};

/*
 * Header used by Iotivity for TCP-like transports.
 * 4 different kinds of headers.
 */
#define COAP_TCP_LENGTH8_OFF      13
#define COAP_TCP_LENGTH16_OFF     269
#define COAP_TCP_LENGTH32_OFF     65805

#define COAP_TCP_TYPE0      0
#define COAP_TCP_TYPE8      13
#define COAP_TCP_TYPE16     14
#define COAP_TCP_TYPE32     15

struct coap_tcp_hdr0 {
#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
    uint8_t  data_len:4;        /* packet length */
    uint8_t  token_len:4;       /* length of token */
#else
    uint8_t  token_len:4;       /* length of token */
    uint8_t  data_len:4;        /* packet length */
#endif
    uint8_t  code;
};

struct coap_tcp_hdr8 {
#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
    uint8_t  type:4;            /* header type == 13 */
    uint8_t  token_len:4;       /* length of token */
#else
    uint8_t  token_len:4;       /* length of token */
    uint8_t  type:4;            /* header type == 13*/
#endif
    uint8_t  data_len;          /* packet size - 13 */
    uint8_t  code;
};

struct coap_tcp_hdr16 {
#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
    uint8_t  type:4;            /* header type == 14 */
    uint8_t  token_len:4;       /* length of token */
#else
    uint8_t  token_len:4;       /* length of token */
    uint8_t  type:4;            /* header type == 14 */
#endif
    uint16_t data_len;          /* packet size - 269 */
    uint8_t  code;
} __attribute__((packed));

struct coap_tcp_hdr32 {
#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
    uint8_t  type:4;            /* header type == 15 */
    uint8_t  token_len:4;       /* length of token */
#else
    uint8_t  token_len:4;       /* length of token */
    uint8_t  type:4;            /* header type == 15*/
#endif
    uint32_t data_len;       /* packet size - 65805 */
    uint8_t  code;
} __attribute__((packed));

#define COAP_TCP_TYPE8  13
#define COAP_TCP_TYPE16 14
#define COAP_TCP_TYPE32 15


#define COAP_HEADER_OPTION_DELTA_MASK 0xF0
#define COAP_HEADER_OPTION_SHORT_LENGTH_MASK 0x0F

/* CoAP message types */
typedef enum {
  COAP_TYPE_CON, /* confirmables */
  COAP_TYPE_NON, /* non-confirmables */
  COAP_TYPE_ACK, /* acknowledgements */
  COAP_TYPE_RST  /* reset */
} coap_message_type_t;

/* CoAP request method codes */
typedef enum { COAP_GET = 1, COAP_POST, COAP_PUT, COAP_DELETE } coap_method_t;

/* CoAP response codes */
typedef enum {
  NO_ERROR = 0,

  CREATED_2_01 = 65,  /* CREATED */
  DELETED_2_02 = 66,  /* DELETED */
  VALID_2_03 = 67,    /* NOT_MODIFIED */
  CHANGED_2_04 = 68,  /* CHANGED */
  CONTENT_2_05 = 69,  /* OK */
  CONTINUE_2_31 = 95, /* CONTINUE */

  BAD_REQUEST_4_00 = 128,              /* BAD_REQUEST */
  UNAUTHORIZED_4_01 = 129,             /* UNAUTHORIZED */
  BAD_OPTION_4_02 = 130,               /* BAD_OPTION */
  FORBIDDEN_4_03 = 131,                /* FORBIDDEN */
  NOT_FOUND_4_04 = 132,                /* NOT_FOUND */
  METHOD_NOT_ALLOWED_4_05 = 133,       /* METHOD_NOT_ALLOWED */
  NOT_ACCEPTABLE_4_06 = 134,           /* NOT_ACCEPTABLE */
  PRECONDITION_FAILED_4_12 = 140,      /* BAD_REQUEST */
  REQUEST_ENTITY_TOO_LARGE_4_13 = 141, /* REQUEST_ENTITY_TOO_LARGE */
  UNSUPPORTED_MEDIA_TYPE_4_15 = 143,   /* UNSUPPORTED_MEDIA_TYPE */

  INTERNAL_SERVER_ERROR_5_00 = 160,  /* INTERNAL_SERVER_ERROR */
  NOT_IMPLEMENTED_5_01 = 161,        /* NOT_IMPLEMENTED */
  BAD_GATEWAY_5_02 = 162,            /* BAD_GATEWAY */
  SERVICE_UNAVAILABLE_5_03 = 163,    /* SERVICE_UNAVAILABLE */
  GATEWAY_TIMEOUT_5_04 = 164,        /* GATEWAY_TIMEOUT */
  PROXYING_NOT_SUPPORTED_5_05 = 165, /* PROXYING_NOT_SUPPORTED */

  /* Erbium errors */
  MEMORY_ALLOCATION_ERROR = 192,
  PACKET_SERIALIZATION_ERROR,

  /* Erbium hooks */
  CLEAR_TRANSACTION,
  EMPTY_ACK_RESPONSE
} coap_status_t;

/* CoAP header option numbers */
typedef enum {
  COAP_OPTION_IF_MATCH = 1,        /* 0-8 B */
  COAP_OPTION_URI_HOST = 3,        /* 1-255 B */
  COAP_OPTION_ETAG = 4,            /* 1-8 B */
  COAP_OPTION_IF_NONE_MATCH = 5,   /* 0 B */
  COAP_OPTION_OBSERVE = 6,         /* 0-3 B */
  COAP_OPTION_URI_PORT = 7,        /* 0-2 B */
  COAP_OPTION_LOCATION_PATH = 8,   /* 0-255 B */
  COAP_OPTION_URI_PATH = 11,       /* 0-255 B */
  COAP_OPTION_CONTENT_FORMAT = 12, /* 0-2 B */
  COAP_OPTION_MAX_AGE = 14,        /* 0-4 B */
  COAP_OPTION_URI_QUERY = 15,      /* 0-255 B */
  COAP_OPTION_ACCEPT = 17,         /* 0-2 B */
  COAP_OPTION_LOCATION_QUERY = 20, /* 0-255 B */
  COAP_OPTION_BLOCK2 = 23,         /* 1-3 B */
  COAP_OPTION_BLOCK1 = 27,         /* 1-3 B */
  COAP_OPTION_SIZE2 = 28,          /* 0-4 B */
  COAP_OPTION_PROXY_URI = 35,      /* 1-1034 B */
  COAP_OPTION_PROXY_SCHEME = 39,   /* 1-255 B */
  COAP_OPTION_SIZE1 = 60,          /* 0-4 B */
} coap_option_t;

/* CoAP Content-Formats */
typedef enum {
  TEXT_PLAIN = 0,
  TEXT_XML = 1,
  TEXT_CSV = 2,
  TEXT_HTML = 3,
  IMAGE_GIF = 21,
  IMAGE_JPEG = 22,
  IMAGE_PNG = 23,
  IMAGE_TIFF = 24,
  AUDIO_RAW = 25,
  VIDEO_RAW = 26,
  APPLICATION_LINK_FORMAT = 40,
  APPLICATION_XML = 41,
  APPLICATION_OCTET_STREAM = 42,
  APPLICATION_RDF_XML = 43,
  APPLICATION_SOAP_XML = 44,
  APPLICATION_ATOM_XML = 45,
  APPLICATION_XMPP_XML = 46,
  APPLICATION_EXI = 47,
  APPLICATION_FASTINFOSET = 48,
  APPLICATION_SOAP_FASTINFOSET = 49,
  APPLICATION_JSON = 50,
  APPLICATION_X_OBIX_BINARY = 51,
  APPLICATION_CBOR = 60
} coap_content_format_t;

#ifdef __cplusplus
}
#endif

#endif /* CONSTANTS_H */