// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

#ifndef BLUEZ_DATA_P_H
#define BLUEZ_DATA_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include <QtCore/private/qglobal_p.h>
#include <QtCore/qendian.h>
#include <sys/socket.h>
#include <QtBluetooth/QBluetoothUuid>
#include <QtCore/qtmetamacros.h>

QT_BEGIN_NAMESPACE

#define ATTRIBUTE_CHANNEL_ID 4
#define SIGNALING_CHANNEL_ID 5
#define SECURITY_CHANNEL_ID 6

#define BTPROTO_L2CAP   0
#define BTPROTO_HCI     1
#define BTPROTO_RFCOMM  3

#define SOL_HCI     0
#define SOL_L2CAP   6
#define SOL_RFCOMM  18
#ifndef SOL_BLUETOOTH
#define SOL_BLUETOOTH   274
#endif

#define RFCOMM_LM   0x03

#define RFCOMM_LM_AUTH      0x0002
#define RFCOMM_LM_ENCRYPT   0x0004
#define RFCOMM_LM_TRUSTED   0x0008
#define RFCOMM_LM_SECURE    0x0020

#define L2CAP_LM            0x03
#define L2CAP_LM_AUTH       0x0002
#define L2CAP_LM_ENCRYPT    0x0004
#define L2CAP_LM_TRUSTED    0x0008
#define L2CAP_LM_SECURE     0x0020

#define BT_SECURITY 4
struct bt_security {
    quint8 level;
    quint8 key_size;
};
#define BT_SECURITY_SDP     0
#define BT_SECURITY_LOW     1
#define BT_SECURITY_MEDIUM  2
#define BT_SECURITY_HIGH    3

#define BDADDR_LE_PUBLIC    0x01
#define BDADDR_LE_RANDOM    0x02

#define SCO_LINK    0x00
#define ACL_LINK    0x01
#define ESCO_LINK   0x02
#define LE_LINK     0x80    // based on hcitool.c -> no fixed constant available

/* Byte order conversions */
#if __BYTE_ORDER == __LITTLE_ENDIAN
#define htobs(d)  (d)
#define htobl(d)  (d)
#define htobll(d) (d)
#define btohs(d)  (d)
#define btohl(d)  (d)
#define btohll(d) (d)
#elif __BYTE_ORDER == __BIG_ENDIAN
#define htobs(d)  qbswap((quint16)(d))
#define htobl(d)  qbswap((quint32)(d))
#define htobll(d) qbswap((quint64)(d))
#define btohs(d)  qbswap((quint16)(d))
#define btohl(d)  qbswap((quint32)(d))
#define btohll(d) qbswap((quint64)(d))
#else
#error "Unknown byte order"
#endif

#define HCIGETCONNLIST  _IOR('H', 212, int)
#define HCIGETDEVINFO   _IOR('H', 211, int)
#define HCIGETDEVLIST   _IOR('H', 210, int)

// Generic 128 bits of data
typedef QUuid::Id128Bytes BluezUint128;

// Bluetooth address
typedef struct {
    quint8 b[6];
} __attribute__((packed)) bdaddr_t;

// L2CP socket
struct sockaddr_l2 {
    sa_family_t     l2_family;
    unsigned short  l2_psm;
    bdaddr_t        l2_bdaddr;
    unsigned short  l2_cid;
#if !defined(QT_BLUEZ_NO_BTLE)
    quint8          l2_bdaddr_type;
#endif
};

// RFCOMM socket
struct sockaddr_rc {
    sa_family_t rc_family;
    bdaddr_t    rc_bdaddr;
    quint8      rc_channel;
};

// Bt Low Energy related

template<typename T> inline T getBtData(const void *ptr)
{
    return qFromLittleEndian<T>(reinterpret_cast<const uchar *>(ptr));
}

static inline quint16 bt_get_le16(const void *ptr)
{
    return getBtData<quint16>(ptr);
}

template<typename T> inline void putBtData(T src, void *dst)
{
    qToLittleEndian(src, reinterpret_cast<uchar *>(dst));
}

// HCI related

#define HCI_MAX_DEV     16
#define HCI_DEV_NONE    0xffff

#define HCI_CHANNEL_CONTROL     0x3

#define HCI_MAX_EVENT_SIZE 260

// HCI sockopts
#define HCI_FILTER 2

// HCI packet types
#define HCI_COMMAND_PKT 0x01
#define HCI_ACL_PKT     0x02
#define HCI_EVENT_PKT   0x04
#define HCI_VENDOR_PKT  0xff

#define HCI_FLT_TYPE_BITS  31
#define HCI_FLT_EVENT_BITS 63


struct sockaddr_hci {
    sa_family_t hci_family;
    unsigned short hci_dev;
    unsigned short hci_channel;
};

struct hci_dev_req {
    quint16 dev_id;
    quint32 dev_opt;
};

struct hci_dev_list_req {
    quint16 dev_num;
    struct hci_dev_req dev_req[0];
};

struct hci_dev_stats {
    quint32 err_rx;
    quint32 err_tx;
    quint32 cmd_tx;
    quint32 evt_rx;
    quint32 acl_tx;
    quint32 acl_rx;
    quint32 sco_tx;
    quint32 sco_rx;
    quint32 byte_rx;
    quint32 byte_tx;
};

struct hci_dev_info {
    quint16 dev_id;
    char     name[8];

    bdaddr_t bdaddr;

    quint32 flags;
    quint8  type;

    quint8  features[8];

    quint32 pkt_type;
    quint32 link_policy;
    quint32 link_mode;

    quint16 acl_mtu;
    quint16 acl_pkts;
    quint16 sco_mtu;
    quint16 sco_pkts;

    struct   hci_dev_stats stat;
};

struct hci_conn_info {
    quint16 handle;
    bdaddr_t bdaddr;
    quint8  type;
    quint8  out;
    quint16 state;
    quint32 link_mode;
};

struct hci_conn_list_req {
    quint16 dev_id;
    quint16 conn_num;
    struct hci_conn_info conn_info[0];
};

struct hci_filter {
    quint32 type_mask;
    quint32 event_mask[2];
    quint16 opcode;
};

static inline void hci_set_bit(int nr, void *addr)
{
    *((quint32 *) addr + (nr >> 5)) |= (1 << (nr & 31));
}
static inline void hci_clear_bit(int nr, void *addr)
{
    *((quint32 *) addr + (nr >> 5)) &= ~(1 << (nr & 31));
}
static inline void hci_filter_clear(struct hci_filter *f)
{
    memset(f, 0, sizeof(*f));
}
static inline void hci_filter_set_ptype(int t, struct hci_filter *f)
{
    hci_set_bit((t == HCI_VENDOR_PKT) ? 0 : (t & HCI_FLT_TYPE_BITS), &f->type_mask);
}
static inline void hci_filter_clear_ptype(int t, struct hci_filter *f)
{
    hci_clear_bit((t == HCI_VENDOR_PKT) ? 0 : (t & HCI_FLT_TYPE_BITS), &f->type_mask);
}
static inline void hci_filter_set_event(int e, struct hci_filter *f)
{
    hci_set_bit((e & HCI_FLT_EVENT_BITS), &f->event_mask);
}
static inline void hci_filter_clear_event(int e, struct hci_filter *f)
{
    hci_clear_bit((e & HCI_FLT_EVENT_BITS), &f->event_mask);
}
static inline void hci_filter_all_ptypes(struct hci_filter *f)
{
    memset((void *) &f->type_mask, 0xff, sizeof(f->type_mask));
}
static inline void hci_filter_all_events(struct hci_filter *f)
{
    memset((void *) f->event_mask, 0xff, sizeof(f->event_mask));
}

typedef struct {
    quint8 evt;
    quint8 plen;
} __attribute__ ((packed)) hci_event_hdr;
#define HCI_EVENT_HDR_SIZE 2

typedef struct {
    quint8  status;
    quint16 handle;
    quint8  encrypt;
} __attribute__ ((packed)) evt_encrypt_change;
#define EVT_ENCRYPT_CHANGE_SIZE 4

struct evt_cmd_complete {
    quint8 ncmd;
    quint16 opcode;
} __attribute__ ((packed));

struct AclData {
    quint16 handle: 12;
    quint16 pbFlag: 2;
    quint16 bcFlag: 2;
    quint16 dataLen;
};

struct L2CapHeader {
    quint16 length;
    quint16 channelId;
};

struct hci_command_hdr {
    quint16 opcode;         /* OCF & OGF */
    quint8 plen;
} __attribute__ ((packed));

namespace QBluezConst {
    Q_NAMESPACE
    enum OpCodeGroupField {
        OgfLinkControl = 0x8,
    };
    Q_ENUM_NS(OpCodeGroupField)

    enum OpCodeCommandField {
        OcfLeSetAdvParams = 0x6,
        OcfLeReadTxPowerLevel = 0x7,
        OcfLeSetAdvData = 0x8,
        OcfLeSetScanResponseData = 0x9,
        OcfLeSetAdvEnable = 0xa,
        OcfLeClearWhiteList = 0x10,
        OcfLeAddToWhiteList = 0x11,
        OcfLeConnectionUpdate = 0x13,
    };
    Q_ENUM_NS(OpCodeCommandField)

    enum class AttCommand : quint8 {
        ATT_OP_ERROR_RESPONSE              = 0x01,
        ATT_OP_EXCHANGE_MTU_REQUEST        = 0x02, //send own mtu
        ATT_OP_EXCHANGE_MTU_RESPONSE       = 0x03, //receive server MTU
        ATT_OP_FIND_INFORMATION_REQUEST    = 0x04, //discover individual attribute info
        ATT_OP_FIND_INFORMATION_RESPONSE   = 0x05,
        ATT_OP_FIND_BY_TYPE_VALUE_REQUEST  = 0x06,
        ATT_OP_FIND_BY_TYPE_VALUE_RESPONSE = 0x07,
        ATT_OP_READ_BY_TYPE_REQUEST        = 0x08, //discover characteristics
        ATT_OP_READ_BY_TYPE_RESPONSE       = 0x09,
        ATT_OP_READ_REQUEST                = 0x0A, //read characteristic & descriptor values
        ATT_OP_READ_RESPONSE               = 0x0B,
        ATT_OP_READ_BLOB_REQUEST           = 0x0C, //read values longer than MTU-1
        ATT_OP_READ_BLOB_RESPONSE          = 0x0D,
        ATT_OP_READ_MULTIPLE_REQUEST       = 0x0E,
        ATT_OP_READ_MULTIPLE_RESPONSE      = 0x0F,
        ATT_OP_READ_BY_GROUP_REQUEST       = 0x10, //discover services
        ATT_OP_READ_BY_GROUP_RESPONSE      = 0x11,
        ATT_OP_WRITE_REQUEST               = 0x12, //write characteristic with response
        ATT_OP_WRITE_RESPONSE              = 0x13,
        ATT_OP_PREPARE_WRITE_REQUEST       = 0x16, //write values longer than MTU-3 -> queueing
        ATT_OP_PREPARE_WRITE_RESPONSE      = 0x17,
        ATT_OP_EXECUTE_WRITE_REQUEST       = 0x18, //write values longer than MTU-3 -> execute queue
        ATT_OP_EXECUTE_WRITE_RESPONSE      = 0x19,
        ATT_OP_HANDLE_VAL_NOTIFICATION     = 0x1b, //informs about value change
        ATT_OP_HANDLE_VAL_INDICATION       = 0x1d, //informs about value change -> requires reply
        ATT_OP_HANDLE_VAL_CONFIRMATION     = 0x1e, //answer for ATT_OP_HANDLE_VAL_INDICATION
        ATT_OP_WRITE_COMMAND               = 0x52, //write characteristic without response
        ATT_OP_SIGNED_WRITE_COMMAND        = 0xD2
    };
    Q_ENUM_NS(AttCommand)

    enum class AttError : quint8 {
        ATT_ERROR_NO_ERROR              = 0x00,
        ATT_ERROR_INVALID_HANDLE        = 0x01,
        ATT_ERROR_READ_NOT_PERM         = 0x02,
        ATT_ERROR_WRITE_NOT_PERM        = 0x03,
        ATT_ERROR_INVALID_PDU           = 0x04,
        ATT_ERROR_INSUF_AUTHENTICATION  = 0x05,
        ATT_ERROR_REQUEST_NOT_SUPPORTED = 0x06,
        ATT_ERROR_INVALID_OFFSET        = 0x07,
        ATT_ERROR_INSUF_AUTHORIZATION   = 0x08,
        ATT_ERROR_PREPARE_QUEUE_FULL    = 0x09,
        ATT_ERROR_ATTRIBUTE_NOT_FOUND   = 0x0A,
        ATT_ERROR_ATTRIBUTE_NOT_LONG    = 0x0B,
        ATT_ERROR_INSUF_ENCR_KEY_SIZE   = 0x0C,
        ATT_ERROR_INVAL_ATTR_VALUE_LEN  = 0x0D,
        ATT_ERROR_UNLIKELY              = 0x0E,
        ATT_ERROR_INSUF_ENCRYPTION      = 0x0F,
        ATT_ERROR_UNSUPPRTED_GROUP_TYPE = 0x10,
        ATT_ERROR_INSUF_RESOURCES       = 0x11,
        ATT_ERROR_APPLICATION_START     = 0x80,
        //------------------------------------------
        // The error codes in this block are
        // implementation specific errors

        ATT_ERROR_REQUEST_STALLED       = 0x81,

        //------------------------------------------
        ATT_ERROR_APPLICATION_END       = 0x9f
    };
    Q_ENUM_NS(AttError)
}
/* Command opcode pack/unpack */
#define opCodePack(ogf, ocf) (quint16(((ocf) & 0x03ff)|((ogf) << 10)))
#define ogfFromOpCode(op) ((op) >> 10)
#define ocfFromOpCode(op) ((op) & 0x03ff)

QT_END_NAMESPACE

#endif // BLUEZ_DATA_P_H