/*
  Copyright 2011-2020 David Robillard <d@drobilla.net>

  Permission to use, copy, modify, and/or distribute this software for any
  purpose with or without fee is hereby granted, provided that the above
  copyright notice and this permission notice appear in all copies.

  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#include "byte_sink.h"

#include "serd_config.h"
#include "system.h"

#include "serd/serd.h"

#include <assert.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>

#if USE_POSIX_FADVISE && USE_FILENO
#  include <fcntl.h>
#endif

static int
close_buffer(void* const stream)
{
  serd_buffer_sink("", 1, 1, stream); // Write null terminator

  return 0;
}

SerdByteSink*
serd_byte_sink_new_buffer(SerdBuffer* const buffer)
{
  assert(buffer);

  return serd_byte_sink_new_function(
    serd_buffer_sink, close_buffer, buffer, 1u);
}

SerdByteSink*
serd_byte_sink_new_function(const SerdWriteFunc       write_func,
                            const SerdStreamCloseFunc close_func,
                            void* const               stream,
                            const size_t              block_size)
{
  if (!block_size) {
    return NULL;
  }

  SerdByteSink* sink = (SerdByteSink*)calloc(1, sizeof(SerdByteSink));

  sink->write_func = write_func;
  sink->close_func = close_func;
  sink->stream     = stream;
  sink->block_size = block_size;

  if (block_size > 1) {
    sink->buf = (char*)serd_allocate_buffer(block_size);
  }

  return sink;
}

SerdByteSink*
serd_byte_sink_new_filename(const char* const path, const size_t block_size)
{
  assert(path);

  if (!block_size) {
    return NULL;
  }

  FILE* const file = fopen(path, "wb");
  if (!file) {
    return NULL;
  }

#if USE_POSIX_FADVISE && USE_FILENO
  posix_fadvise(fileno(file), 0, 0, POSIX_FADV_SEQUENTIAL);
#endif

  return serd_byte_sink_new_function(
    (SerdWriteFunc)fwrite, (SerdStreamCloseFunc)fclose, file, block_size);
}

void
serd_byte_sink_flush(SerdByteSink* sink)
{
  assert(sink);

  if (sink->stream && sink->block_size > 1 && sink->size > 0) {
    sink->write_func(sink->buf, 1, sink->size, sink->stream);
    sink->size = 0;
  }
}

SerdStatus
serd_byte_sink_close(SerdByteSink* sink)
{
  assert(sink);

  serd_byte_sink_flush(sink);

  if (sink->stream && sink->close_func) {
    const int st = sink->close_func(sink->stream);
    sink->stream = NULL;
    return st ? SERD_ERR_UNKNOWN : SERD_SUCCESS;
  }

  sink->stream = NULL;
  return SERD_SUCCESS;
}

void
serd_byte_sink_free(SerdByteSink* const sink)
{
  if (sink) {
    serd_byte_sink_close(sink);
    serd_free_aligned(sink->buf);
    free(sink);
  }
}