/*
 * Copyright (C) 2018 BlueKitchen GmbH
 *
 * 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 copyright holders nor the names of
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 * 4. Any redistribution, use, or modification is done solely for
 *    personal benefit and not for any commercial purpose or for
 *    monetary gain.
 *
 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH 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 BLUEKITCHEN
 * GMBH 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.
 *
 * Please inquire about commercial licensing options at 
 * contact@bluekitchen-gmbh.com
 *
 */

#ifndef MESH_KEYS_H
#define MESH_KEYS_H

#include <stdint.h>

#include "btstack_linked_list.h"

#include "mesh/adv_bearer.h"

#ifdef __cplusplus
extern "C"
{
#endif

#define MESH_KEYS_INVALID_INDEX 0xffff

typedef struct {
    btstack_linked_item_t item;

    // internal index [0..MAX_NR_MESH_NETWORK_KEYS-1]
    uint16_t internal_index;

    // index into shared global key list
    uint16_t netkey_index;

    // internal version - allows for newer-than relation between keys with same netkey_index
    uint8_t version;

    // net_key from provisioner or Config Model Client
    uint8_t net_key[16];

    // derived data

    // k1
    uint8_t identity_key[16];
    uint8_t beacon_key[16];

    // k3
    uint8_t network_id[8];

    // k2
    uint8_t nid;
    uint8_t encryption_key[16];
    uint8_t privacy_key[16];

} mesh_network_key_t;

typedef struct {
    btstack_linked_list_iterator_t it;
    mesh_network_key_t * key;
    uint8_t nid;
} mesh_network_key_iterator_t;

typedef struct {
    btstack_linked_item_t item;

    // internal index [0..MAX_NR_MESH_TRANSPORT_KEYS-1]
    uint16_t internal_index;

    // netkey_index of subnet this app key is used with
    uint16_t netkey_index;

    // index into shared global app key list
    uint16_t appkey_index;

    // app_key
    uint8_t key[16];

    // internal version - allows for newer-than relation between keys with same appkey_index
    uint8_t version;

    // old key - mark key as 'older' in app key update or startup
    uint8_t old_key;

    // application key flag, 0 for device key
    uint8_t akf;

    // application key hash id
    uint8_t aid;

    // key refresth
    uint8_t key_refresh;

} mesh_transport_key_t;

typedef struct {
    btstack_linked_list_iterator_t it;
    mesh_transport_key_t * key;
    uint16_t netkey_index;
    uint8_t  akf;
    uint8_t  aid;
} mesh_transport_key_iterator_t;

/**
 * @brief Init network key storage
 */
void mesh_network_key_init(void);

/**
 * @brief Get internal index of free network key storage entry
 * @note index 0 is reserved for primary network key
 * @return index or MESH_KEYS_INVALID_INDEX if none found
 */
uint16_t mesh_network_key_get_free_index(void);

/**
 * @brief Add network key to list
 * @param network_key
 * @note derivative data k1-k3 need to be already calculated
 */
void mesh_network_key_add(mesh_network_key_t * network_key);

/**
 * @brief Remove network key from list
 * @param network_key
 * @return true if removed
 * @note key is only removed from list, memory is not released
 */
bool mesh_network_key_remove(mesh_network_key_t * network_key);

/**
 * @brief Get network_key for netkey_index
 * @param netkey_index
 * @return mesh_network_key_t or NULL
 */
mesh_network_key_t * mesh_network_key_list_get(uint16_t netkey_index);

/**
 * @brief Get number of stored network_keys
 * @return count
 */
int mesh_network_key_list_count(void);

/**
 * @brief Iterate over all network keys
 * @param it
 */
void mesh_network_key_iterator_init(mesh_network_key_iterator_t *it);

/**
 * @brief Check if another network_key is available
 * @param it
 * @return
 */
int mesh_network_key_iterator_has_more(mesh_network_key_iterator_t *it);

/**
 * @brief Get net network_key
 * @param it
 * @return
 */
mesh_network_key_t * mesh_network_key_iterator_get_next(mesh_network_key_iterator_t *it);

/**
 * @brief Iterate over all network keys with a given NID
 * @param it
 * @param nid
 */
void mesh_network_key_nid_iterator_init(mesh_network_key_iterator_t *it, uint8_t nid);

/**
 * @brief Check if another network_key with given NID is available
 * @param it
 * @return
 */
int mesh_network_key_nid_iterator_has_more(mesh_network_key_iterator_t *it);

/**
 * @brief Get next network_key with given NID
 * @param it
 * @return
 */
mesh_network_key_t * mesh_network_key_nid_iterator_get_next(mesh_network_key_iterator_t *it);

/**
 * Transport Keys = Application Keys + Device Key
 */

/**
 * @brief Set device key
 * @param device_key
 */
void mesh_transport_set_device_key(const uint8_t * device_key);

/**
 * @brief Get internal index of free transport key storage entry
 * @note index 0 is reserved for device key
 * @return index or 0u if none found
 */
uint16_t mesh_transport_key_get_free_index(void);

/**
 * @brief Add application key to list
 * @param application key
 * @note AID needs to be set
 */
void mesh_transport_key_add(mesh_transport_key_t * transport_key);

/**
 * @brief Remove application key from list
 * @param application key
 * @return 0 if removed
 * @note key is only removed from list, memory is not released
 */
bool mesh_transport_key_remove(mesh_transport_key_t * transport_key);

/**
 * Get transport key for appkey_index
 * @param appkey_index
 * @return
 */
mesh_transport_key_t * mesh_transport_key_get(uint16_t appkey_index);

/**
 * @brief Iterate over all transport keys (AppKeys) for a given netkey index
 * @param it
 * @param netkey_index
 */
void mesh_transport_key_iterator_init(mesh_transport_key_iterator_t *it, uint16_t netkey_index);

/**
 * @brief Check if another transport key (AppKey) is available
 * @param it
 * @return
 */
int mesh_transport_key_iterator_has_more(mesh_transport_key_iterator_t *it);

/**
 * @brief Get next transport key (AppKey)
 * @param it
 * @return
 */
mesh_transport_key_t * mesh_transport_key_iterator_get_next(mesh_transport_key_iterator_t *it);

/**
 * @brief Transport Key Iterator by AID - init
 * @param it
 * @param netkey_index
 * @param akf
 * @param aid
 */
void mesh_transport_key_aid_iterator_init(mesh_transport_key_iterator_t *it, uint16_t netkey_index, uint8_t akf,
                                          uint8_t aid);

/**
 * @brief Transport Key Iterator by AID - has more?
 * @param it
 * @return
 */
int mesh_transport_key_aid_iterator_has_more(mesh_transport_key_iterator_t *it);

/**
 * @brief Transport Key Iterator by AID - get next
 * @param it
 * @return transport key
 */
mesh_transport_key_t * mesh_transport_key_aid_iterator_get_next(mesh_transport_key_iterator_t *it);

#ifdef __cplusplus
} /* end of extern "C" */
#endif

#endif
