/*
     This file is part of GNUnet.
     Copyright (C) 2004, 2005, 2006, 2008, 2009, 2010 GNUnet e.V.

     GNUnet is free software: you can redistribute it and/or modify it
     under the terms of the GNU Affero General Public License as published
     by the Free Software Foundation, either version 3 of the License,
     or (at your option) any later version.

     GNUnet is distributed in the hope that it will be useful, but
     WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Affero General Public License for more details.

     You should have received a copy of the GNU Affero General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.

     SPDX-License-Identifier: AGPL3.0-or-later
 */

/**
 * @file fs/test_fs_download_persistence.c
 * @brief simple testcase for persistence of simple download operation
 * @author Christian Grothoff
 */
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_testing_lib.h"
#include "gnunet_fs_service.h"

/**
 * File-size we use for testing.
 */
#define FILESIZE (1024 * 1024 * 2)

/**
 * How long until we give up on transmitting the message?
 */
#define TIMEOUT GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 60)

/**
 * How long should our test-content live?
 */
#define LIFETIME GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MINUTES, 15)


static struct GNUNET_TIME_Absolute start;

static const struct GNUNET_CONFIGURATION_Handle *cfg;

static struct GNUNET_FS_Handle *fs;

static struct GNUNET_FS_DownloadContext *download;

static struct GNUNET_FS_PublishContext *publish;

static struct GNUNET_SCHEDULER_Task * timeout_kill;

static char *fn;

static int err;


static void
timeout_kill_task(void *cls)
{
  GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Timeout downloading file\n");
  if (download != NULL)
    {
      GNUNET_FS_download_stop(download, GNUNET_YES);
      download = NULL;
    }
  else if (publish != NULL)
    {
      GNUNET_FS_publish_stop(publish);
      publish = NULL;
    }
  timeout_kill = NULL;
  err = 1;
}


static void
abort_publish_task(void *cls)
{
  if (publish != NULL)
    {
      GNUNET_FS_publish_stop(publish);
      publish = NULL;
    }
}


static void
abort_download_task(void *cls)
{
  uint64_t size;

  if (download != NULL)
    {
      GNUNET_FS_download_stop(download, GNUNET_YES);
      download = NULL;
    }
  GNUNET_assert(GNUNET_OK == GNUNET_DISK_file_size(fn, &size, GNUNET_YES, GNUNET_NO));
  GNUNET_assert(size == FILESIZE);
  GNUNET_DISK_directory_remove(fn);
  GNUNET_free(fn);
  fn = NULL;
  GNUNET_SCHEDULER_cancel(timeout_kill);
  timeout_kill = NULL;
}


static void *
progress_cb(void *cls, const struct GNUNET_FS_ProgressInfo *event);


static void
restart_fs_task(void *cls)
{
  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Restarting FS.\n");
  GNUNET_FS_stop(fs);
  fs = GNUNET_FS_start(cfg, "test-fs-download-persistence", &progress_cb, NULL,
                       GNUNET_FS_FLAGS_PERSISTENCE, GNUNET_FS_OPTIONS_END);
}


/**
 * Consider scheduling the restart-task.
 * Only runs the restart task once per event
 * category.
 *
 * @param ev type of the event to consider
 */
static void
consider_restart(int ev)
{
  static int prev[32];
  static int off;
  int i;

  for (i = 0; i < off; i++)
    if (prev[i] == ev)
      return;
  prev[off++] = ev;
  GNUNET_SCHEDULER_add_with_priority(GNUNET_SCHEDULER_PRIORITY_URGENT,
                                     &restart_fs_task, NULL);
}


static void *
progress_cb(void *cls, const struct GNUNET_FS_ProgressInfo *event)
{
  switch (event->status)
    {
    case GNUNET_FS_STATUS_PUBLISH_PROGRESS:
      GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
                 "Publish is progressing (%llu/%llu at level %u off %llu)...\n",
                 (unsigned long long)event->value.publish.completed,
                 (unsigned long long)event->value.publish.size,
                 event->value.publish.specifics.progress.depth,
                 (unsigned long long)event->value.publish.specifics.
                 progress.offset);
      break;

    case GNUNET_FS_STATUS_PUBLISH_PROGRESS_DIRECTORY:
      break;

    case GNUNET_FS_STATUS_PUBLISH_COMPLETED:
      printf("Publishing complete, %llu kbps.\n",
             (unsigned long long)(FILESIZE * 1000000LL /
                                  (1 +
                                   GNUNET_TIME_absolute_get_duration
                                     (start).rel_value_us) / 1024LL));
      fn = GNUNET_DISK_mktemp("gnunet-download-test-dst");
      start = GNUNET_TIME_absolute_get();
      GNUNET_assert(download == NULL);
      GNUNET_FS_download_start(fs,
                               event->value.publish.specifics.completed.chk_uri,
                               NULL, fn, NULL, 0, FILESIZE, 1,
                               GNUNET_FS_DOWNLOAD_OPTION_NONE, "download", NULL);
      break;

    case GNUNET_FS_STATUS_DOWNLOAD_COMPLETED:
      printf("Download complete,  %llu kbps.\n",
             (unsigned long long)(FILESIZE * 1000000LL /
                                  (1 +
                                   GNUNET_TIME_absolute_get_duration
                                     (start).rel_value_us) / 1024LL));
      GNUNET_SCHEDULER_add_now(&abort_download_task, NULL);
      break;

    case GNUNET_FS_STATUS_DOWNLOAD_PROGRESS:
      consider_restart(event->status);
      GNUNET_assert(download == event->value.download.dc);
      GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
                 "Download is progressing (%llu/%llu at level %u off %llu)...\n",
                 (unsigned long long)event->value.download.completed,
                 (unsigned long long)event->value.download.size,
                 event->value.download.specifics.progress.depth,
                 (unsigned long long)event->value.download.specifics.
                 progress.offset);
      break;

    case GNUNET_FS_STATUS_PUBLISH_ERROR:
      fprintf(stderr, "Error publishing file: %s\n",
              event->value.publish.specifics.error.message);
      GNUNET_break(0);
      GNUNET_SCHEDULER_add_now(&abort_publish_task, NULL);
      break;

    case GNUNET_FS_STATUS_DOWNLOAD_ERROR:
      fprintf(stderr, "Error downloading file: %s\n",
              event->value.download.specifics.error.message);
      GNUNET_SCHEDULER_add_now(&abort_download_task, NULL);
      break;

    case GNUNET_FS_STATUS_PUBLISH_SUSPEND:
      GNUNET_assert(event->value.publish.pc == publish);
      publish = NULL;
      break;

    case GNUNET_FS_STATUS_PUBLISH_RESUME:
      GNUNET_assert(NULL == publish);
      publish = event->value.publish.pc;
      break;

    case GNUNET_FS_STATUS_DOWNLOAD_SUSPEND:
      GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Download suspended.\n");
      GNUNET_assert(event->value.download.dc == download);
      download = NULL;
      break;

    case GNUNET_FS_STATUS_DOWNLOAD_RESUME:
      GNUNET_assert(NULL == download);
      download = event->value.download.dc;
      GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Download resumed.\n");
      break;

    case GNUNET_FS_STATUS_DOWNLOAD_ACTIVE:
      consider_restart(event->status);
      GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Download active.\n");
      break;

    case GNUNET_FS_STATUS_DOWNLOAD_INACTIVE:
      consider_restart(event->status);
      GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Download inactive.\n");
      break;

    case GNUNET_FS_STATUS_PUBLISH_START:
      GNUNET_assert(0 == strcmp("publish-context", event->value.publish.cctx));
      GNUNET_assert(NULL == event->value.publish.pctx);
      GNUNET_assert(FILESIZE == event->value.publish.size);
      GNUNET_assert(0 == event->value.publish.completed);
      GNUNET_assert(1 == event->value.publish.anonymity);
      break;

    case GNUNET_FS_STATUS_PUBLISH_STOPPED:
      GNUNET_assert(publish == event->value.publish.pc);
      GNUNET_assert(FILESIZE == event->value.publish.size);
      GNUNET_assert(1 == event->value.publish.anonymity);
      GNUNET_FS_stop(fs);
      fs = NULL;
      break;

    case GNUNET_FS_STATUS_DOWNLOAD_START:
      GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Download started.\n");
      consider_restart(event->status);
      GNUNET_assert(download == NULL);
      download = event->value.download.dc;
      GNUNET_assert(0 == strcmp("download", event->value.download.cctx));
      GNUNET_assert(NULL == event->value.download.pctx);
      GNUNET_assert(NULL != event->value.download.uri);
      GNUNET_assert(0 == strcmp(fn, event->value.download.filename));
      GNUNET_assert(FILESIZE == event->value.download.size);
      GNUNET_assert(0 == event->value.download.completed);
      GNUNET_assert(1 == event->value.download.anonymity);
      break;

    case GNUNET_FS_STATUS_DOWNLOAD_STOPPED:
      GNUNET_assert(download == event->value.download.dc);
      GNUNET_SCHEDULER_add_now(&abort_publish_task, NULL);
      download = NULL;
      break;

    default:
      printf("Unexpected event: %d\n", event->status);
      break;
    }
  return NULL;
}


static void
run(void *cls,
    const struct GNUNET_CONFIGURATION_Handle *c,
    struct GNUNET_TESTING_Peer *peer)
{
  const char *keywords[] = {
    "down_foo",
    "down_bar",
  };
  char *buf;
  struct GNUNET_CONTAINER_MetaData *meta;
  struct GNUNET_FS_Uri *kuri;
  struct GNUNET_FS_FileInformation *fi;
  size_t i;
  struct GNUNET_FS_BlockOptions bo;

  cfg = c;
  fs = GNUNET_FS_start(cfg, "test-fs-download-persistence", &progress_cb, NULL,
                       GNUNET_FS_FLAGS_PERSISTENCE, GNUNET_FS_OPTIONS_END);
  GNUNET_assert(NULL != fs);
  buf = GNUNET_malloc(FILESIZE);
  for (i = 0; i < FILESIZE; i++)
    buf[i] = GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_WEAK, 256);
  meta = GNUNET_CONTAINER_meta_data_create();
  kuri = GNUNET_FS_uri_ksk_create_from_args(2, keywords);
  bo.content_priority = 42;
  bo.anonymity_level = 1;
  bo.replication_level = 0;
  bo.expiration_time = GNUNET_TIME_relative_to_absolute(LIFETIME);
  fi = GNUNET_FS_file_information_create_from_data(fs, "publish-context",
                                                   FILESIZE, buf, kuri, meta,
                                                   GNUNET_NO, &bo);
  GNUNET_FS_uri_destroy(kuri);
  GNUNET_CONTAINER_meta_data_destroy(meta);
  GNUNET_assert(NULL != fi);
  timeout_kill =
    GNUNET_SCHEDULER_add_delayed(TIMEOUT, &timeout_kill_task, NULL);
  start = GNUNET_TIME_absolute_get();
  publish =
    GNUNET_FS_publish_start(fs, fi, NULL, NULL, NULL,
                            GNUNET_FS_PUBLISH_OPTION_NONE);
  GNUNET_assert(publish != NULL);
}


int
main(int argc, char *argv[])
{
  if (0 != GNUNET_TESTING_peer_run("test-fs-download-persistence",
                                   "test_fs_download_data.conf",
                                   &run, NULL))
    return 1;
  return err;
}

/* end of test_fs_download_persistence.c */