#ifndef __IFNOW_H__
#define __IFNOW_H__

#define IFNOW_MAX_RECEIVE (512)
#define DATARATE_1Mbps 0x02
#define DATARATE_2Mbps 0x04
#define DATARATE_6Mbps 0x0c
#define DATARATE_9Mbps 0x12
#define DATARATE_12Mbps 0x18
#define DATARATE_18Mbps 0x24
#define DATARATE_24Mbps 0x30
#define DATARATE_36Mbps 0x48
#define DATARATE_48Mbps 0x60
#define DATARATE_54Mbps 0x6c

#define CHANNEL_freq_1 2412
#define CHANNEL_freq_2 2417
#define CHANNEL_freq_3 2422
#define CHANNEL_freq_4 2427
#define CHANNEL_freq_5 2432
#define CHANNEL_freq_6 2437
#define CHANNEL_freq_7 2442
#define CHANNEL_freq_8 2447
#define CHANNEL_freq_9 2452
#define CHANNEL_freq_10 2457
#define CHANNEL_freq_11 2462
#define CHANNEL_freq_12 2467
#define CHANNEL_freq_13 2472

#define WLAN_LEN 24
#define ACTIONFRAME_HEADER_LEN 8
#define VENDORSPECIFIC_CONTENT_LEN 7

struct IEEE80211_radiotap {
  uint8_t version; 
  uint8_t pad;
  uint16_t length;
  uint32_t present;
  uint8_t flags;
  uint8_t datarate;
  uint16_t channel_freq;
  uint16_t channel_flags_quarter;
}; 

#define IFNOW_RADIOTAP_DEFAULT() {\
  .version = 0,\
  .pad = 0,\
  .length = sizeof(struct IEEE80211_radiotap),\
  .present = 0x0000000e,\
  .flags = 0x10,\
  .datarate = DATARATE_6Mbps,\
  .channel_freq = CHANNEL_freq_1,\
  .channel_flags_quarter = 0x00c0,\
}

struct IEEE80211_vendorspecific {
  uint8_t elementID;
  uint8_t length;
  uint8_t OUI[3];
  uint8_t type;
  uint8_t version;
  uint8_t payload[250];
} __attribute__((__packed__));

#define IFNOW_VENDORSPECIFIC_DEFAULT() {\
  .elementID = 0xdd,\
  .OUI[0] = 0x18,\
  .OUI[1] = 0xfe,\
  .OUI[2] = 0x34,\
  .type = 0x04,\
  .version = 0x01,\
}

struct IEEE80211_actionframe {
  uint8_t category_code;
  uint8_t OUI[3];
  uint8_t unknown_bytes[4];
  struct IEEE80211_vendorspecific content;
} __attribute__((__packed__));

#define IFNOW_ACTIONFRAME_DEFAULT() {\
  .category_code = 0x7f,\
  .OUI[0] = 0x18,\
  .OUI[1] = 0xfe,\
  .OUI[2] = 0x34,\
}

struct IEEE80211_wlan {
  uint8_t type;
  uint8_t flags;
  uint16_t duration;
  uint8_t da[6];
  uint8_t sa[6];
  uint8_t bssid[6];
  uint16_t seq;
  struct IEEE80211_actionframe actionframe;
  uint32_t fcs;
};

#define IFNOW_WLAN_DEFAULT() {\
  .type = 0xd0,\
  .flags = 0x00,\
  .duration = 0x0000,\
  .seq = 0x0280,\
  .fcs = 0x00000000,\
}

typedef struct {
  struct IEEE80211_radiotap radiotap;
  struct IEEE80211_wlan wlan;
} ifnow_packet_t;

#endif // __IFNOW_H__