//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2021
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "td/telegram/AnimationsManager.h"

#include "td/telegram/AuthManager.h"
#include "td/telegram/ConfigShared.h"
#include "td/telegram/DialogId.h"
#include "td/telegram/Document.h"
#include "td/telegram/DocumentsManager.h"
#include "td/telegram/FileReferenceManager.h"
#include "td/telegram/files/FileManager.h"
#include "td/telegram/files/FileType.h"
#include "td/telegram/Global.h"
#include "td/telegram/logevent/LogEvent.h"
#include "td/telegram/misc.h"
#include "td/telegram/secret_api.h"
#include "td/telegram/Td.h"
#include "td/telegram/td_api.h"
#include "td/telegram/TdDb.h"
#include "td/telegram/telegram_api.h"

#include "td/actor/PromiseFuture.h"

#include "td/db/SqliteKeyValueAsync.h"

#include "td/utils/algorithm.h"
#include "td/utils/logging.h"
#include "td/utils/misc.h"
#include "td/utils/Random.h"
#include "td/utils/Time.h"
#include "td/utils/tl_helpers.h"

#include <algorithm>

namespace td {

class GetSavedGifsQuery : public Td::ResultHandler {
  bool is_repair_ = false;

 public:
  void send(bool is_repair, int32 hash) {
    is_repair_ = is_repair;
    LOG(INFO) << "Send get saved animations request with hash = " << hash;
    send_query(G()->net_query_creator().create(telegram_api::messages_getSavedGifs(hash)));
  }

  void on_result(uint64 id, BufferSlice packet) final {
    auto result_ptr = fetch_result<telegram_api::messages_getSavedGifs>(packet);
    if (result_ptr.is_error()) {
      return on_error(id, result_ptr.move_as_error());
    }

    auto ptr = result_ptr.move_as_ok();
    td->animations_manager_->on_get_saved_animations(is_repair_, std::move(ptr));
  }

  void on_error(uint64 id, Status status) final {
    if (!G()->is_expected_error(status)) {
      LOG(ERROR) << "Receive error for get saved animations: " << status;
    }
    td->animations_manager_->on_get_saved_animations_failed(is_repair_, std::move(status));
  }
};

class SaveGifQuery : public Td::ResultHandler {
  FileId file_id_;
  string file_reference_;
  bool unsave_ = false;

  Promise<Unit> promise_;

 public:
  explicit SaveGifQuery(Promise<Unit> &&promise) : promise_(std::move(promise)) {
  }

  void send(FileId file_id, tl_object_ptr<telegram_api::inputDocument> &&input_document, bool unsave) {
    CHECK(input_document != nullptr);
    CHECK(file_id.is_valid());
    file_id_ = file_id;
    file_reference_ = input_document->file_reference_.as_slice().str();
    unsave_ = unsave;
    send_query(G()->net_query_creator().create(telegram_api::messages_saveGif(std::move(input_document), unsave)));
  }

  void on_result(uint64 id, BufferSlice packet) final {
    auto result_ptr = fetch_result<telegram_api::messages_saveGif>(packet);
    if (result_ptr.is_error()) {
      return on_error(id, result_ptr.move_as_error());
    }

    bool result = result_ptr.move_as_ok();
    LOG(INFO) << "Receive result for save GIF: " << result;
    if (!result) {
      td->animations_manager_->reload_saved_animations(true);
    }

    promise_.set_value(Unit());
  }

  void on_error(uint64 id, Status status) final {
    if (!td->auth_manager_->is_bot() && FileReferenceManager::is_file_reference_error(status)) {
      VLOG(file_references) << "Receive " << status << " for " << file_id_;
      td->file_manager_->delete_file_reference(file_id_, file_reference_);
      td->file_reference_manager_->repair_file_reference(
          file_id_, PromiseCreator::lambda([animation_id = file_id_, unsave = unsave_,
                                            promise = std::move(promise_)](Result<Unit> result) mutable {
            if (result.is_error()) {
              return promise.set_error(Status::Error(400, "Failed to find the animation"));
            }

            send_closure(G()->animations_manager(), &AnimationsManager::send_save_gif_query, animation_id, unsave,
                         std::move(promise));
          }));
      return;
    }

    if (!G()->is_expected_error(status)) {
      LOG(ERROR) << "Receive error for save GIF: " << status;
    }
    td->animations_manager_->reload_saved_animations(true);
    promise_.set_error(std::move(status));
  }
};

AnimationsManager::AnimationsManager(Td *td, ActorShared<> parent) : td_(td), parent_(std::move(parent)) {
  auto limit_string = G()->td_db()->get_binlog_pmc()->get("saved_animations_limit");
  if (!limit_string.empty()) {
    auto new_limit = to_integer<int32>(limit_string);
    if (new_limit > 0) {
      LOG(DEBUG) << "Load saved animations limit = " << new_limit;
      saved_animations_limit_ = new_limit;
    } else {
      LOG(ERROR) << "Wrong saved animations limit = \"" << limit_string << "\" stored in database";
    }
  }
  next_saved_animations_load_time_ = Time::now();
}

void AnimationsManager::tear_down() {
  parent_.reset();
}

int32 AnimationsManager::get_animation_duration(FileId file_id) const {
  auto it = animations_.find(file_id);
  CHECK(it != animations_.end());
  return it->second->duration;
}

tl_object_ptr<td_api::animation> AnimationsManager::get_animation_object(FileId file_id, const char *source) {
  if (!file_id.is_valid()) {
    return nullptr;
  }

  auto &animation = animations_[file_id];
  LOG_CHECK(animation != nullptr) << source << " " << file_id << " "
                                  << static_cast<int32>(td_->file_manager_->get_file_view(file_id).get_type());
  // TODO can we make that function const?
  animation->is_changed = false;
  auto thumbnail =
      animation->animated_thumbnail.file_id.is_valid()
          ? get_thumbnail_object(td_->file_manager_.get(), animation->animated_thumbnail, PhotoFormat::Mpeg4)
          : get_thumbnail_object(td_->file_manager_.get(), animation->thumbnail, PhotoFormat::Jpeg);
  return make_tl_object<td_api::animation>(animation->duration, animation->dimensions.width,
                                           animation->dimensions.height, animation->file_name, animation->mime_type,
                                           animation->has_stickers, get_minithumbnail_object(animation->minithumbnail),
                                           std::move(thumbnail), td_->file_manager_->get_file_object(file_id));
}

FileId AnimationsManager::on_get_animation(unique_ptr<Animation> new_animation, bool replace) {
  auto file_id = new_animation->file_id;
  CHECK(file_id.is_valid());
  auto &a = animations_[file_id];
  LOG(INFO) << (a == nullptr ? "Add" : (replace ? "Replace" : "Ignore")) << " animation " << file_id << " of size "
            << new_animation->dimensions;
  if (a == nullptr) {
    a = std::move(new_animation);
  } else if (replace) {
    CHECK(a->file_id == file_id);
    if (a->mime_type != new_animation->mime_type) {
      LOG(DEBUG) << "Animation " << file_id << " info has changed";
      a->mime_type = new_animation->mime_type;
      a->is_changed = true;
    }
    if (a->file_name != new_animation->file_name) {
      LOG(DEBUG) << "Animation " << file_id << " file name has changed";
      a->file_name = std::move(new_animation->file_name);
      a->is_changed = true;
    }
    if (a->dimensions != new_animation->dimensions) {
      LOG(DEBUG) << "Animation " << file_id << " dimensions has changed";
      a->dimensions = new_animation->dimensions;
      a->is_changed = true;
    }
    if (a->duration != new_animation->duration) {
      LOG(DEBUG) << "Animation " << file_id << " duration has changed";
      a->duration = new_animation->duration;
      a->is_changed = true;
    }
    if (a->minithumbnail != new_animation->minithumbnail) {
      a->minithumbnail = std::move(new_animation->minithumbnail);
      a->is_changed = true;
    }
    if (a->thumbnail != new_animation->thumbnail) {
      if (!a->thumbnail.file_id.is_valid()) {
        LOG(DEBUG) << "Animation " << file_id << " thumbnail has changed";
      } else {
        LOG(INFO) << "Animation " << file_id << " thumbnail has changed from " << a->thumbnail << " to "
                  << new_animation->thumbnail;
      }
      a->thumbnail = new_animation->thumbnail;
      a->is_changed = true;
    }
    if (a->animated_thumbnail != new_animation->animated_thumbnail) {
      if (!a->animated_thumbnail.file_id.is_valid()) {
        LOG(DEBUG) << "Animation " << file_id << " animated thumbnail has changed";
      } else {
        LOG(INFO) << "Animation " << file_id << " animated thumbnail has changed from " << a->animated_thumbnail
                  << " to " << new_animation->animated_thumbnail;
      }
      a->animated_thumbnail = new_animation->animated_thumbnail;
      a->is_changed = true;
    }
    if (a->has_stickers != new_animation->has_stickers && new_animation->has_stickers) {
      a->has_stickers = new_animation->has_stickers;
      a->is_changed = true;
    }
    if (a->sticker_file_ids != new_animation->sticker_file_ids && !new_animation->sticker_file_ids.empty()) {
      a->sticker_file_ids = std::move(new_animation->sticker_file_ids);
      a->is_changed = true;
    }
  }

  return file_id;
}

const AnimationsManager::Animation *AnimationsManager::get_animation(FileId file_id) const {
  auto animation = animations_.find(file_id);
  if (animation == animations_.end()) {
    return nullptr;
  }

  CHECK(animation->second->file_id == file_id);
  return animation->second.get();
}

FileId AnimationsManager::get_animation_thumbnail_file_id(FileId file_id) const {
  auto animation = get_animation(file_id);
  CHECK(animation != nullptr);
  return animation->thumbnail.file_id;
}

FileId AnimationsManager::get_animation_animated_thumbnail_file_id(FileId file_id) const {
  auto animation = get_animation(file_id);
  CHECK(animation != nullptr);
  return animation->animated_thumbnail.file_id;
}

void AnimationsManager::delete_animation_thumbnail(FileId file_id) {
  auto &animation = animations_[file_id];
  CHECK(animation != nullptr);
  animation->thumbnail = PhotoSize();
  animation->animated_thumbnail = AnimationSize();
}

FileId AnimationsManager::dup_animation(FileId new_id, FileId old_id) {
  LOG(INFO) << "Dup animation " << old_id << " to " << new_id;
  const Animation *old_animation = get_animation(old_id);
  CHECK(old_animation != nullptr);
  auto &new_animation = animations_[new_id];
  CHECK(!new_animation);
  new_animation = make_unique<Animation>(*old_animation);
  new_animation->file_id = new_id;
  new_animation->thumbnail.file_id = td_->file_manager_->dup_file_id(new_animation->thumbnail.file_id);
  new_animation->animated_thumbnail.file_id =
      td_->file_manager_->dup_file_id(new_animation->animated_thumbnail.file_id);
  return new_id;
}

bool AnimationsManager::merge_animations(FileId new_id, FileId old_id, bool can_delete_old) {
  if (!old_id.is_valid()) {
    LOG(ERROR) << "Old file identifier is invalid";
    return true;
  }

  LOG(INFO) << "Merge animations " << new_id << " and " << old_id;
  const Animation *old_ = get_animation(old_id);
  CHECK(old_ != nullptr);
  if (old_id == new_id) {
    return old_->is_changed;
  }

  bool need_merge = true;
  auto new_it = animations_.find(new_id);
  if (new_it == animations_.end()) {
    auto &old = animations_[old_id];
    old->is_changed = true;
    if (!can_delete_old) {
      dup_animation(new_id, old_id);
    } else {
      old->file_id = new_id;
      animations_.emplace(new_id, std::move(old));
    }
  } else {
    Animation *new_ = new_it->second.get();
    CHECK(new_ != nullptr);

    new_->is_changed = true;
    if (old_->thumbnail != new_->thumbnail) {
      //    LOG_STATUS(td_->file_manager_->merge(new_->thumbnail.file_id, old_->thumbnail.file_id));
    }
    if (old_->mime_type == "image/gif" && new_->mime_type == "video/mp4") {
      need_merge = false;
    }
  }
  if (need_merge) {
    LOG_STATUS(td_->file_manager_->merge(new_id, old_id));
  }
  if (can_delete_old) {
    animations_.erase(old_id);
  }
  return true;
}

void AnimationsManager::create_animation(FileId file_id, string minithumbnail, PhotoSize thumbnail,
                                         AnimationSize animated_thumbnail, bool has_stickers,
                                         vector<FileId> &&sticker_file_ids, string file_name, string mime_type,
                                         int32 duration, Dimensions dimensions, bool replace) {
  auto a = make_unique<Animation>();
  a->file_id = file_id;
  a->file_name = std::move(file_name);
  a->mime_type = std::move(mime_type);
  a->duration = max(duration, 0);
  a->dimensions = dimensions;
  if (!td_->auth_manager_->is_bot()) {
    a->minithumbnail = std::move(minithumbnail);
  }
  a->thumbnail = std::move(thumbnail);
  a->animated_thumbnail = std::move(animated_thumbnail);
  a->has_stickers = has_stickers;
  a->sticker_file_ids = std::move(sticker_file_ids);
  on_get_animation(std::move(a), replace);
}

tl_object_ptr<telegram_api::InputMedia> AnimationsManager::get_input_media(
    FileId file_id, tl_object_ptr<telegram_api::InputFile> input_file,
    tl_object_ptr<telegram_api::InputFile> input_thumbnail) const {
  auto file_view = td_->file_manager_->get_file_view(file_id);
  if (file_view.is_encrypted()) {
    return nullptr;
  }
  if (file_view.has_remote_location() && !file_view.main_remote_location().is_web() && input_file == nullptr) {
    return make_tl_object<telegram_api::inputMediaDocument>(0, file_view.main_remote_location().as_input_document(), 0,
                                                            string());
  }
  if (file_view.has_url()) {
    return make_tl_object<telegram_api::inputMediaDocumentExternal>(0, file_view.url(), 0);
  }

  if (input_file != nullptr) {
    const Animation *animation = get_animation(file_id);
    CHECK(animation != nullptr);

    vector<tl_object_ptr<telegram_api::DocumentAttribute>> attributes;
    if (!animation->file_name.empty()) {
      attributes.push_back(make_tl_object<telegram_api::documentAttributeFilename>(animation->file_name));
    }
    string mime_type = animation->mime_type;
    if (mime_type == "video/mp4") {
      attributes.push_back(make_tl_object<telegram_api::documentAttributeVideo>(
          0, false /*ignored*/, false /*ignored*/, animation->duration, animation->dimensions.width,
          animation->dimensions.height));
    } else if (animation->dimensions.width != 0 && animation->dimensions.height != 0) {
      if (!begins_with(mime_type, "image/")) {
        mime_type = "image/gif";
      }
      attributes.push_back(make_tl_object<telegram_api::documentAttributeImageSize>(animation->dimensions.width,
                                                                                    animation->dimensions.height));
    }
    int32 flags = 0;
    vector<tl_object_ptr<telegram_api::InputDocument>> added_stickers;
    if (animation->has_stickers) {
      flags |= telegram_api::inputMediaUploadedDocument::STICKERS_MASK;
      added_stickers = td_->file_manager_->get_input_documents(animation->sticker_file_ids);
    }
    if (input_thumbnail != nullptr) {
      flags |= telegram_api::inputMediaUploadedDocument::THUMB_MASK;
    }
    return make_tl_object<telegram_api::inputMediaUploadedDocument>(
        flags, false /*ignored*/, false /*ignored*/, std::move(input_file), std::move(input_thumbnail), mime_type,
        std::move(attributes), std::move(added_stickers), 0);
  } else {
    CHECK(!file_view.has_remote_location());
  }

  return nullptr;
}

SecretInputMedia AnimationsManager::get_secret_input_media(FileId animation_file_id,
                                                           tl_object_ptr<telegram_api::InputEncryptedFile> input_file,
                                                           const string &caption, BufferSlice thumbnail) const {
  auto *animation = get_animation(animation_file_id);
  CHECK(animation != nullptr);
  auto file_view = td_->file_manager_->get_file_view(animation_file_id);
  auto &encryption_key = file_view.encryption_key();
  if (!file_view.is_encrypted_secret() || encryption_key.empty()) {
    return SecretInputMedia{};
  }
  if (file_view.has_remote_location()) {
    input_file = file_view.main_remote_location().as_input_encrypted_file();
  }
  if (!input_file) {
    return SecretInputMedia{};
  }
  if (animation->thumbnail.file_id.is_valid() && thumbnail.empty()) {
    return SecretInputMedia{};
  }
  vector<tl_object_ptr<secret_api::DocumentAttribute>> attributes;
  if (!animation->file_name.empty()) {
    attributes.push_back(make_tl_object<secret_api::documentAttributeFilename>(animation->file_name));
  }
  if (animation->duration != 0 && animation->mime_type == "video/mp4") {
    attributes.push_back(make_tl_object<secret_api::documentAttributeVideo66>(
        0, false, animation->duration, animation->dimensions.width, animation->dimensions.height));
  }
  if (animation->dimensions.width != 0 && animation->dimensions.height != 0) {
    attributes.push_back(make_tl_object<secret_api::documentAttributeImageSize>(animation->dimensions.width,
                                                                                animation->dimensions.height));
  }
  attributes.push_back(make_tl_object<secret_api::documentAttributeAnimated>());

  return SecretInputMedia{
      std::move(input_file),
      make_tl_object<secret_api::decryptedMessageMediaDocument>(
          std::move(thumbnail), animation->thumbnail.dimensions.width, animation->thumbnail.dimensions.height,
          animation->mime_type, narrow_cast<int32>(file_view.size()), BufferSlice(encryption_key.key_slice()),
          BufferSlice(encryption_key.iv_slice()), std::move(attributes), caption)};
}

void AnimationsManager::on_update_animation_search_emojis(string animation_search_emojis) {
  if (G()->close_flag()) {
    return;
  }
  if (td_->auth_manager_->is_bot()) {
    G()->shared_config().set_option_empty("animation_search_emojis");
    return;
  }

  is_animation_search_emojis_inited_ = true;
  if (animation_search_emojis_ == animation_search_emojis) {
    return;
  }
  animation_search_emojis_ = std::move(animation_search_emojis);

  try_send_update_animation_search_parameters();
}

void AnimationsManager::on_update_animation_search_provider(string animation_search_provider) {
  if (G()->close_flag()) {
    return;
  }
  if (td_->auth_manager_->is_bot()) {
    G()->shared_config().set_option_empty("animation_search_provider");
    return;
  }

  is_animation_search_provider_inited_ = true;
  if (animation_search_provider_ == animation_search_provider) {
    return;
  }
  animation_search_provider_ = std::move(animation_search_provider);

  try_send_update_animation_search_parameters();
}

void AnimationsManager::on_update_saved_animations_limit(int32 saved_animations_limit) {
  if (saved_animations_limit != saved_animations_limit_) {
    if (saved_animations_limit > 0) {
      LOG(INFO) << "Update saved animations limit to " << saved_animations_limit;
      G()->td_db()->get_binlog_pmc()->set("saved_animations_limit", to_string(saved_animations_limit));
      saved_animations_limit_ = saved_animations_limit;
      if (static_cast<int32>(saved_animation_ids_.size()) > saved_animations_limit_) {
        saved_animation_ids_.resize(saved_animations_limit_);
        send_update_saved_animations();
      }
    } else {
      LOG(ERROR) << "Receive wrong saved animations limit = " << saved_animations_limit;
    }
  }
}

class AnimationsManager::AnimationListLogEvent {
 public:
  vector<FileId> animation_ids;

  AnimationListLogEvent() = default;

  explicit AnimationListLogEvent(vector<FileId> animation_ids) : animation_ids(std::move(animation_ids)) {
  }

  template <class StorerT>
  void store(StorerT &storer) const {
    AnimationsManager *animations_manager = storer.context()->td().get_actor_unsafe()->animations_manager_.get();
    td::store(narrow_cast<int32>(animation_ids.size()), storer);
    for (auto animation_id : animation_ids) {
      animations_manager->store_animation(animation_id, storer);
    }
  }

  template <class ParserT>
  void parse(ParserT &parser) {
    AnimationsManager *animations_manager = parser.context()->td().get_actor_unsafe()->animations_manager_.get();
    int32 size = parser.fetch_int();
    animation_ids.resize(size);
    for (auto &animation_id : animation_ids) {
      animation_id = animations_manager->parse_animation(parser);
    }
  }
};

void AnimationsManager::reload_saved_animations(bool force) {
  if (G()->close_flag()) {
    return;
  }

  if (!td_->auth_manager_->is_bot() && !are_saved_animations_being_loaded_ &&
      (next_saved_animations_load_time_ < Time::now() || force)) {
    LOG_IF(INFO, force) << "Reload saved animations";
    are_saved_animations_being_loaded_ = true;
    td_->create_handler<GetSavedGifsQuery>()->send(false, get_saved_animations_hash("reload_saved_animations"));
  }
}

void AnimationsManager::repair_saved_animations(Promise<Unit> &&promise) {
  if (td_->auth_manager_->is_bot()) {
    return promise.set_error(Status::Error(400, "Bots has no saved animations"));
  }

  repair_saved_animations_queries_.push_back(std::move(promise));
  if (repair_saved_animations_queries_.size() == 1u) {
    td_->create_handler<GetSavedGifsQuery>()->send(true, 0);
  }
}

vector<FileId> AnimationsManager::get_saved_animations(Promise<Unit> &&promise) {
  if (!are_saved_animations_loaded_) {
    load_saved_animations(std::move(promise));
    return {};
  }
  reload_saved_animations(false);

  promise.set_value(Unit());
  return saved_animation_ids_;
}

void AnimationsManager::load_saved_animations(Promise<Unit> &&promise) {
  if (td_->auth_manager_->is_bot()) {
    are_saved_animations_loaded_ = true;
  }
  if (are_saved_animations_loaded_) {
    promise.set_value(Unit());
    return;
  }
  load_saved_animations_queries_.push_back(std::move(promise));
  if (load_saved_animations_queries_.size() == 1u) {
    if (G()->parameters().use_file_db) {  // otherwise there is no sqlite_pmc, TODO
      LOG(INFO) << "Trying to load saved animations from database";
      G()->td_db()->get_sqlite_pmc()->get("ans", PromiseCreator::lambda([](string value) {
                                            send_closure(G()->animations_manager(),
                                                         &AnimationsManager::on_load_saved_animations_from_database,
                                                         std::move(value));
                                          }));
    } else {
      LOG(INFO) << "Trying to load saved animations from server";
      reload_saved_animations(true);
    }
  }
}

void AnimationsManager::on_load_saved_animations_from_database(const string &value) {
  if (G()->close_flag()) {
    return;
  }
  if (value.empty()) {
    LOG(INFO) << "Saved animations aren't found in database";
    reload_saved_animations(true);
    return;
  }

  LOG(INFO) << "Successfully loaded saved animations list of size " << value.size() << " from database";

  AnimationListLogEvent log_event;
  log_event_parse(log_event, value).ensure();

  on_load_saved_animations_finished(std::move(log_event.animation_ids), true);
}

void AnimationsManager::on_load_saved_animations_finished(vector<FileId> &&saved_animation_ids, bool from_database) {
  if (static_cast<int32>(saved_animation_ids.size()) > saved_animations_limit_) {
    saved_animation_ids.resize(saved_animations_limit_);
  }
  saved_animation_ids_ = std::move(saved_animation_ids);
  are_saved_animations_loaded_ = true;
  send_update_saved_animations(from_database);
  auto promises = std::move(load_saved_animations_queries_);
  load_saved_animations_queries_.clear();
  for (auto &promise : promises) {
    promise.set_value(Unit());
  }
}

void AnimationsManager::on_get_saved_animations(
    bool is_repair, tl_object_ptr<telegram_api::messages_SavedGifs> &&saved_animations_ptr) {
  CHECK(!td_->auth_manager_->is_bot());
  if (!is_repair) {
    are_saved_animations_being_loaded_ = false;
    next_saved_animations_load_time_ = Time::now_cached() + Random::fast(30 * 60, 50 * 60);
  }

  CHECK(saved_animations_ptr != nullptr);
  int32 constructor_id = saved_animations_ptr->get_id();
  if (constructor_id == telegram_api::messages_savedGifsNotModified::ID) {
    if (is_repair) {
      return on_get_saved_animations_failed(true, Status::Error(500, "Failed to reload saved animations"));
    }
    LOG(INFO) << "Saved animations are not modified";
    return;
  }
  CHECK(constructor_id == telegram_api::messages_savedGifs::ID);
  auto saved_animations = move_tl_object_as<telegram_api::messages_savedGifs>(saved_animations_ptr);
  LOG(INFO) << "Receive " << saved_animations->gifs_.size() << " saved animations from server";

  vector<FileId> saved_animation_ids;
  saved_animation_ids.reserve(saved_animations->gifs_.size());
  for (auto &document_ptr : saved_animations->gifs_) {
    int32 document_constructor_id = document_ptr->get_id();
    if (document_constructor_id == telegram_api::documentEmpty::ID) {
      LOG(ERROR) << "Empty saved animation document received";
      continue;
    }
    CHECK(document_constructor_id == telegram_api::document::ID);
    auto document =
        td_->documents_manager_->on_get_document(move_tl_object_as<telegram_api::document>(document_ptr), DialogId());
    if (document.type != Document::Type::Animation) {
      LOG(ERROR) << "Receive " << document << " instead of animation as saved animation";
      continue;
    }
    if (!is_repair) {
      saved_animation_ids.push_back(document.file_id);
    }
  }

  if (is_repair) {
    auto promises = std::move(repair_saved_animations_queries_);
    repair_saved_animations_queries_.clear();
    for (auto &promise : promises) {
      promise.set_value(Unit());
    }
  } else {
    on_load_saved_animations_finished(std::move(saved_animation_ids));

    LOG_IF(ERROR, get_saved_animations_hash("on_get_saved_animations") != saved_animations->hash_)
        << "Saved animations hash mismatch: " << saved_animations->hash_ << " vs "
        << get_saved_animations_hash("on_get_saved_animations 2");
  }
}

void AnimationsManager::on_get_saved_animations_failed(bool is_repair, Status error) {
  CHECK(error.is_error());
  if (!is_repair) {
    are_saved_animations_being_loaded_ = false;
    next_saved_animations_load_time_ = Time::now_cached() + Random::fast(5, 10);
  }
  auto &queries = is_repair ? repair_saved_animations_queries_ : load_saved_animations_queries_;
  auto promises = std::move(queries);
  queries.clear();
  for (auto &promise : promises) {
    promise.set_error(error.clone());
  }
}

int32 AnimationsManager::get_saved_animations_hash(const char *source) const {
  vector<uint32> numbers;
  numbers.reserve(saved_animation_ids_.size() * 2);
  for (auto animation_id : saved_animation_ids_) {
    auto animation = get_animation(animation_id);
    CHECK(animation != nullptr);
    auto file_view = td_->file_manager_->get_file_view(animation_id);
    CHECK(file_view.has_remote_location());
    if (!file_view.remote_location().is_document()) {
      LOG(ERROR) << "Saved animation remote location is not document: " << source << " " << file_view.remote_location();
      continue;
    }
    auto id = static_cast<uint64>(file_view.remote_location().get_id());
    numbers.push_back(static_cast<uint32>(id >> 32));
    numbers.push_back(static_cast<uint32>(id & 0xFFFFFFFF));
  }
  return get_vector_hash(numbers);
}

void AnimationsManager::add_saved_animation(const tl_object_ptr<td_api::InputFile> &input_file,
                                            Promise<Unit> &&promise) {
  if (td_->auth_manager_->is_bot()) {
    return promise.set_error(Status::Error(7, "Method is not available for bots"));
  }
  if (!are_saved_animations_loaded_) {
    load_saved_animations(std::move(promise));
    return;
  }

  auto r_file_id = td_->file_manager_->get_input_file_id(FileType::Animation, input_file, DialogId(), false, false);
  if (r_file_id.is_error()) {
    return promise.set_error(Status::Error(7, r_file_id.error().message()));  // TODO do not drop error code
  }

  add_saved_animation_impl(r_file_id.ok(), true, std::move(promise));
}

void AnimationsManager::send_save_gif_query(FileId animation_id, bool unsave, Promise<Unit> &&promise) {
  if (G()->close_flag()) {
    return promise.set_error(Status::Error(500, "Request aborted"));
  }

  // TODO invokeAfter and log event
  auto file_view = td_->file_manager_->get_file_view(animation_id);
  CHECK(file_view.has_remote_location());
  LOG_CHECK(file_view.remote_location().is_document()) << file_view.remote_location();
  CHECK(!file_view.remote_location().is_web());
  td_->create_handler<SaveGifQuery>(std::move(promise))
      ->send(animation_id, file_view.remote_location().as_input_document(), unsave);
}

void AnimationsManager::add_saved_animation_by_id(FileId animation_id) {
  auto animation = get_animation(animation_id);
  CHECK(animation != nullptr);
  if (animation->has_stickers) {
    return;
  }

  // TODO log event
  add_saved_animation_impl(animation_id, false, Auto());
}

void AnimationsManager::add_saved_animation_impl(FileId animation_id, bool add_on_server, Promise<Unit> &&promise) {
  CHECK(!td_->auth_manager_->is_bot());

  auto file_view = td_->file_manager_->get_file_view(animation_id);
  if (file_view.empty()) {
    return promise.set_error(Status::Error(7, "Animation file not found"));
  }

  LOG(INFO) << "Add saved animation " << animation_id << " with main file " << file_view.file_id();
  if (!are_saved_animations_loaded_) {
    load_saved_animations(
        PromiseCreator::lambda([animation_id, add_on_server, promise = std::move(promise)](Result<> result) mutable {
          if (result.is_ok()) {
            send_closure(G()->animations_manager(), &AnimationsManager::add_saved_animation_impl, animation_id,
                         add_on_server, std::move(promise));
          } else {
            promise.set_error(result.move_as_error());
          }
        }));
    return;
  }

  auto is_equal = [animation_id](FileId file_id) {
    return file_id == animation_id ||
           (file_id.get_remote() == animation_id.get_remote() && animation_id.get_remote() != 0);
  };

  if (!saved_animation_ids_.empty() && is_equal(saved_animation_ids_[0])) {
    // fast path
    if (saved_animation_ids_[0].get_remote() == 0 && animation_id.get_remote() != 0) {
      saved_animation_ids_[0] = animation_id;
      save_saved_animations_to_database();
    }

    return promise.set_value(Unit());
  }

  auto animation = get_animation(animation_id);
  if (animation == nullptr) {
    return promise.set_error(Status::Error(7, "Animation not found"));
  }
  if (animation->mime_type != "video/mp4") {
    return promise.set_error(Status::Error(7, "Only MPEG4 animations can be saved"));
  }

  if (!file_view.has_remote_location()) {
    return promise.set_error(Status::Error(7, "Can save only sent animations"));
  }
  if (file_view.remote_location().is_web()) {
    return promise.set_error(Status::Error(7, "Can't save web animations"));
  }
  if (!file_view.remote_location().is_document()) {
    return promise.set_error(Status::Error(7, "Can't save encrypted animations"));
  }

  auto it = std::find_if(saved_animation_ids_.begin(), saved_animation_ids_.end(), is_equal);
  if (it == saved_animation_ids_.end()) {
    if (static_cast<int32>(saved_animation_ids_.size()) == saved_animations_limit_) {
      saved_animation_ids_.back() = animation_id;
    } else {
      saved_animation_ids_.push_back(animation_id);
    }
    it = saved_animation_ids_.end() - 1;
  }
  std::rotate(saved_animation_ids_.begin(), it, it + 1);
  CHECK(is_equal(saved_animation_ids_[0]));
  if (saved_animation_ids_[0].get_remote() == 0 && animation_id.get_remote() != 0) {
    saved_animation_ids_[0] = animation_id;
  }

  send_update_saved_animations();
  if (add_on_server) {
    send_save_gif_query(animation_id, false, std::move(promise));
  }
}

void AnimationsManager::remove_saved_animation(const tl_object_ptr<td_api::InputFile> &input_file,
                                               Promise<Unit> &&promise) {
  if (td_->auth_manager_->is_bot()) {
    return promise.set_error(Status::Error(7, "Method is not available for bots"));
  }
  if (!are_saved_animations_loaded_) {
    load_saved_animations(std::move(promise));
    return;
  }

  auto r_file_id = td_->file_manager_->get_input_file_id(FileType::Animation, input_file, DialogId(), false, false);
  if (r_file_id.is_error()) {
    return promise.set_error(Status::Error(7, r_file_id.error().message()));  // TODO do not drop error code
  }

  FileId file_id = r_file_id.ok();
  if (!td::remove(saved_animation_ids_, file_id)) {
    return promise.set_value(Unit());
  }

  auto animation = get_animation(file_id);
  if (animation == nullptr) {
    return promise.set_error(Status::Error(7, "Animation not found"));
  }

  send_save_gif_query(file_id, true, std::move(promise));

  send_update_saved_animations();
}

void AnimationsManager::try_send_update_animation_search_parameters() const {
  auto update_animation_search_parameters = get_update_animation_search_parameters_object();
  if (update_animation_search_parameters != nullptr) {
    send_closure(G()->td(), &Td::send_update, std::move(update_animation_search_parameters));
  }
}

td_api::object_ptr<td_api::updateAnimationSearchParameters>
AnimationsManager::get_update_animation_search_parameters_object() const {
  if (!is_animation_search_emojis_inited_ || !is_animation_search_provider_inited_) {
    return nullptr;
  }
  return td_api::make_object<td_api::updateAnimationSearchParameters>(animation_search_provider_,
                                                                      full_split(animation_search_emojis_, ','));
}

td_api::object_ptr<td_api::updateSavedAnimations> AnimationsManager::get_update_saved_animations_object() const {
  return td_api::make_object<td_api::updateSavedAnimations>(
      td_->file_manager_->get_file_ids_object(saved_animation_ids_));
}

void AnimationsManager::send_update_saved_animations(bool from_database) {
  if (are_saved_animations_loaded_) {
    vector<FileId> new_saved_animation_file_ids = saved_animation_ids_;
    for (auto &animation_id : saved_animation_ids_) {
      auto animation = get_animation(animation_id);
      CHECK(animation != nullptr);
      if (animation->thumbnail.file_id.is_valid()) {
        new_saved_animation_file_ids.push_back(animation->thumbnail.file_id);
      }
      if (animation->animated_thumbnail.file_id.is_valid()) {
        new_saved_animation_file_ids.push_back(animation->animated_thumbnail.file_id);
      }
    }
    std::sort(new_saved_animation_file_ids.begin(), new_saved_animation_file_ids.end());
    if (new_saved_animation_file_ids != saved_animation_file_ids_) {
      td_->file_manager_->change_files_source(get_saved_animations_file_source_id(), saved_animation_file_ids_,
                                              new_saved_animation_file_ids);
      saved_animation_file_ids_ = std::move(new_saved_animation_file_ids);
    }

    send_closure(G()->td(), &Td::send_update, get_update_saved_animations_object());

    if (!from_database) {
      save_saved_animations_to_database();
    }
  }
}

void AnimationsManager::save_saved_animations_to_database() {
  if (G()->parameters().use_file_db) {
    LOG(INFO) << "Save saved animations to database";
    AnimationListLogEvent log_event(saved_animation_ids_);
    G()->td_db()->get_sqlite_pmc()->set("ans", log_event_store(log_event).as_slice().str(), Auto());
  }
}

FileSourceId AnimationsManager::get_saved_animations_file_source_id() {
  if (!saved_animations_file_source_id_.is_valid()) {
    saved_animations_file_source_id_ = td_->file_reference_manager_->create_saved_animations_file_source();
  }
  return saved_animations_file_source_id_;
}

string AnimationsManager::get_animation_search_text(FileId file_id) const {
  auto animation = get_animation(file_id);
  CHECK(animation != nullptr);
  return animation->file_name;
}

void AnimationsManager::after_get_difference() {
  if (td_->is_online() && !td_->auth_manager_->is_bot()) {
    get_saved_animations(Auto());
  }
}

void AnimationsManager::get_current_state(vector<td_api::object_ptr<td_api::Update>> &updates) const {
  if (td_->auth_manager_->is_bot()) {
    return;
  }

  if (are_saved_animations_loaded_) {
    updates.push_back(get_update_saved_animations_object());
  }
  auto update_animation_search_parameters = get_update_animation_search_parameters_object();
  if (update_animation_search_parameters != nullptr) {
    updates.push_back(std::move(update_animation_search_parameters));
  }
}

}  // namespace td