/*
   Copyright (c) 2014 Anton Titov.

   Copyright (c) 2014 pCloud Ltd.  All rights reserved.

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
   are met: Redistributions of source code must retain the above
   copyright notice, this list of conditions and the following
   disclaimer.  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.  Neither the name of pCloud Ltd 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 COPYRIGHT HOLDERS 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 pCloud
   Ltd 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.
*/

#ifndef _PCLOUD_CRYPTO_H
#define _PCLOUD_CRYPTO_H

#include "papi.h"
#include "pcrypto.h"
#include "pfsfolder.h"
#include "psynclib.h"

#define PSYNC_CRYPTO_SYM_FLAG_ISDIR 1

#define PSYNC_CRYPTO_SECTOR_SIZE 4096

#define PSYNC_CRYPTO_MAX_ERROR 511

#define PSYNC_CRYPTO_UNLOADED_SECTOR_ENCODER                                   \
  ((psync_crypto_aes256_sector_encoder_decoder_t)(PSYNC_CRYPTO_MAX_ERROR + 1))
#define PSYNC_CRYPTO_LOADING_SECTOR_ENCODER                                    \
  ((psync_crypto_aes256_sector_encoder_decoder_t)(PSYNC_CRYPTO_MAX_ERROR + 2))
#define PSYNC_CRYPTO_FAILED_SECTOR_ENCODER                                     \
  ((psync_crypto_aes256_sector_encoder_decoder_t)(PSYNC_CRYPTO_MAX_ERROR + 3))

void psync_cloud_crypto_clean_cachef();

int psync_cloud_crypto_setup(const char *password, const char *hint);
int psync_cloud_crypto_get_hint(char **hint);
int psync_cloud_crypto_start(const char *password);
int psync_cloud_crypto_stop();
int psync_cloud_crypto_isstarted();
int psync_cloud_crypto_reset();
int psync_cloud_crypto_mkdir(psync_folderid_t folderid, const char *name,
                             const char **err, psync_folderid_t *newfolderid);
void psync_cloud_crypto_clean_cache();

psync_crypto_aes256_text_decoder_t
psync_cloud_crypto_get_folder_decoder(psync_fsfolderid_t folderid);
void psync_cloud_crypto_release_folder_decoder(
    psync_fsfolderid_t folderid, psync_crypto_aes256_text_decoder_t decoder);
char *
psync_cloud_crypto_decode_filename(psync_crypto_aes256_text_decoder_t decoder,
                                   const char *name);

psync_crypto_aes256_text_encoder_t
psync_cloud_crypto_get_folder_encoder(psync_fsfolderid_t folderid);
void psync_cloud_crypto_release_folder_encoder(
    psync_fsfolderid_t folderid, psync_crypto_aes256_text_encoder_t encoder);
char *
psync_cloud_crypto_encode_filename(psync_crypto_aes256_text_encoder_t encoder,
                                   const char *name);

psync_crypto_aes256_sector_encoder_decoder_t
psync_cloud_crypto_get_file_encoder(psync_fsfileid_t fileid, uint64_t hash,
                                    int nonetwork);
psync_crypto_aes256_sector_encoder_decoder_t
psync_cloud_crypto_get_file_encoder_from_binresult(psync_fileid_t fileid,
                                                   binresult *res);
void psync_cloud_crypto_release_file_encoder(
    psync_fsfileid_t fileid, uint64_t hash,
    psync_crypto_aes256_sector_encoder_decoder_t encoder);

char *psync_cloud_crypto_get_file_encoded_key(psync_fsfileid_t fileid,
                                              uint64_t hash, size_t *keylen);
char *psync_cloud_crypto_get_new_encoded_key(uint32_t flags, size_t *keylen);
char *
psync_cloud_crypto_get_new_encoded_and_plain_key(uint32_t flags, size_t *keylen,
                                                 psync_symmetric_key_t *deckey);

static inline int psync_crypto_is_error(const void *ptr) {
  return (uintptr_t)ptr <= PSYNC_CRYPTO_MAX_ERROR;
}

static inline int psync_crypto_to_error(const void *ptr) {
  return -((int)(uintptr_t)ptr);
}

int psync_crypto_change_passphrase(const char *oldpassphrase,
                                   const char *newpassphrase, uint32_t flags,
                                   char **privenc, char **sign);
int psync_crypto_change_passphrase_unlocked(const char *newpassphrase,
                                            uint32_t flags, char **privenc,
                                            char **sign);

#endif