/*
   Copyright (c) 2013-2014 Anton Titov.

   Copyright (c) 2013-2014 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 _PSYNC_FS_H
#define _PSYNC_FS_H

#include <pthread.h>
#include <signal.h>

#include "pcrc32c.h"
#include "pcrypto.h"
#include "pfsfolder.h"
#include "pfstasks.h"
#include "pintervaltree.h"
#include "plibs.h"
#include "psettings.h"
#include "pfoldersync.h"
#include "ptimer.h"
#include "ptree.h"
#include "psql.h"

#define pfs_need_per_folder_refresh() pfs_need_per_folder_refresh_f()
#define pfs_need_per_folder_refresh_const() 1

extern char *pfs_fake_prefix;
extern size_t pfs_fake_prefix_len;

typedef struct {
  uint64_t frompage;
  uint64_t topage;
  uint64_t length;
  uint64_t requestedto;
  uint64_t id;
  time_t lastuse;
} psync_file_stream_t;

typedef struct {
  pthread_cond_t cond;
  uint64_t extendto;
  uint64_t extendedto;
  uint32_t waiters;
  int error;
  unsigned char ready;
  unsigned char kill;
  unsigned char finalizelog;
} psync_enc_file_extender_t;

typedef struct {
  psync_tree tree;
  psync_file_stream_t streams[PSYNC_FS_FILESTREAMS_CNT];
  pthread_mutex_t mutex;
  psync_interval_tree_t *writeintervals;
  psync_fstask_folder_t *currentfolder;
  char *currentname;
  psync_fsfileid_t fileid;
  psync_fsfileid_t remotefileid;
  union {
    uint64_t hash;
    const char *staticdata;
  };
  uint64_t initialsize;
  uint64_t currentsize;
  uint64_t laststreamid;
  uint64_t indexoff;
  union {
    uint64_t writeid;
    time_t staticctime;
  };
  psync_timer_t writetimer;
  time_t currentsec;
  time_t origctime;
  int datafile;
  int indexfile;
  uint32_t refcnt;
  uint32_t runningreads;
  uint32_t currentspeed;
  uint32_t bytesthissec;
  unsigned char modified;
  unsigned char newfile;
  unsigned char releasedforupload;
  unsigned char deleted;
  unsigned char encrypted;
  unsigned char throttle;
  unsigned char staticfile;
  unsigned char canmodify;
#if IS_DEBUG
  const char *lockfile;
  const char *lockthread;
  unsigned long lockline;
#endif
  /*
   * for non-encrypted files only offsetof(psync_openfile_t, encoder) bytes are
   * allocated keep all fields for encryption after encoder
   */
  pcrypto_sector_encdec_t encoder;
  psync_tree *sectorsinlog;
  psync_interval_tree_t *authenticatedints;
  psync_fast_hash256_ctx loghashctx;
  psync_enc_file_extender_t *extender;
  int logfile;
  uint32_t logoffset;
} psync_openfile_t;

typedef struct {
  uint64_t offset;
  uint64_t length;
} pfs_index_record;

typedef struct {
  int dummy[0];
} pfs_index_header;

void pfs_debug_check_lock_order(const char *file, unsigned long line);

#if IS_DEBUG
#define pfs_lock_file(of) pfs_do_lock_file(of, __FILE__, __LINE__)


// FIXME: wtf... 
extern PSYNC_THREAD const char *psync_thread_name; 
static inline int pfs_do_lock_file(psync_openfile_t *of, const char *file,
                                         unsigned long line) {
  pfs_debug_check_lock_order(file, line);
  if (unlikely(pthread_mutex_trylock(&of->mutex))) {
    struct timespec tm;
    clock_gettime(CLOCK_REALTIME, &tm);
    tm.tv_sec += 60;
    if (pthread_mutex_timedlock(&of->mutex, &tm)) {
      pdbg_logf(D_ERROR,
            "could not lock mutex of file %s taken in %s:%lu by thread %s",
            of->currentname, of->lockfile, of->lockline, of->lockthread);
      return -1;
    }
  }
  of->lockfile = file;
  of->lockthread = psync_thread_name;
  of->lockline = line;
  return 0;
}
#else
static inline int pfs_lock_file(psync_openfile_t *of) {
  return pthread_mutex_lock(&of->mutex);
}
#endif

int pfs_crypto_err_to_errno(int cryptoerr);
int pfs_update_openfile(uint64_t taskid, uint64_t writeid,
                             psync_fileid_t newfileid, uint64_t hash,
                             uint64_t size, time_t ctime);
// void pfs_uploading_openfile(uint64_t taskid);
int pfs_rename_openfile_locked(psync_fsfileid_t fileid,
                                    psync_fsfolderid_t folderid,
                                    const char *name);
void pfs_mark_openfile_deleted(uint64_t taskid);
int64_t pfs_get_file_writeid(uint64_t taskid);
int64_t pfs_load_interval_tree(int fd, uint64_t size,
                                    psync_interval_tree_t **tree);
int pfs_remount();
void pfs_inc_of_refcnt_locked(psync_openfile_t *of);
void pfs_inc_of_refcnt(psync_openfile_t *of);
void pfs_dec_of_refcnt(psync_openfile_t *of);
void pfs_inc_of_refcnt_and_readers(psync_openfile_t *of);
void pfs_dec_of_refcnt_and_readers(psync_openfile_t *of);

void pfs_refresh();
int pfs_need_per_folder_refresh_f();
void pfs_refresh_folder(psync_folderid_t folderid);

void pfs_pause_until_login();
void pfs_clean_tasks();

void pfs_debug_init_file_mutex(pthread_mutex_t *m);
void pfs_debug_dump_internals();
void pfs_debug_register_signal_handlers();

extern volatile sig_atomic_t shutdown_requested;

#endif