//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2022
//
// 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/DownloadManagerCallback.h"

#include "td/telegram/FileReferenceManager.h"
#include "td/telegram/files/FileManager.h"
#include "td/telegram/Td.h"

#include "td/actor/actor.h"
#include "td/actor/PromiseFuture.h"

#include "td/utils/common.h"
#include "td/utils/Status.h"

namespace td {

void DownloadManagerCallback::update_counters(DownloadManager::Counters counters) {
  send_closure(td_->actor_id(td_), &Td::send_update, counters.get_update_file_downloads_object());
}

void DownloadManagerCallback::update_file_removed(FileId file_id) {
  send_closure(td_->actor_id(td_), &Td::send_update,
               td_api::make_object<td_api::updateFileRemovedFromDownloads>(file_id.get()));
}

void DownloadManagerCallback::start_file(FileId file_id, int8 priority, ActorShared<DownloadManager> download_manager) {
  send_closure(td_->file_manager_actor_, &FileManager::download, file_id,
               make_download_file_callback(td_, std::move(download_manager)), priority,
               FileManager::KEEP_DOWNLOAD_OFFSET, FileManager::IGNORE_DOWNLOAD_LIMIT);
}

void DownloadManagerCallback::pause_file(FileId file_id) {
  send_closure(td_->file_manager_actor_, &FileManager::download, file_id, nullptr, 0, FileManager::KEEP_DOWNLOAD_OFFSET,
               FileManager::KEEP_DOWNLOAD_LIMIT);
}

void DownloadManagerCallback::delete_file(FileId file_id) {
  send_closure(td_->file_manager_actor_, &FileManager::delete_file, file_id, Promise<Unit>(),
               "download manager callback");
}

FileId DownloadManagerCallback::dup_file_id(FileId file_id) {
  return td_->file_manager_->dup_file_id(file_id);
}

FileView DownloadManagerCallback::get_file_view(FileId file_id) {
  return td_->file_manager_->get_file_view(file_id);
}

FileView DownloadManagerCallback::get_sync_file_view(FileId file_id) {
  return td_->file_manager_->get_sync_file_view(file_id);
}

td_api::object_ptr<td_api::fileDownload> DownloadManagerCallback::get_file_download_object(
    FileId file_id, FileSourceId file_source_id, int32 add_date, int32 complete_date, bool is_paused) {
  return td_api::make_object<td_api::fileDownload>(td_->file_manager_->get_file_view(file_id).file_id().get(),
                                                   td_->file_reference_manager_->get_message_object(file_source_id),
                                                   add_date, complete_date, is_paused);
}

std::shared_ptr<FileManager::DownloadCallback> DownloadManagerCallback::make_download_file_callback(
    Td *td, ActorShared<DownloadManager> download_manager) {
  class Impl final : public FileManager::DownloadCallback {
   public:
    Impl(Td *td, ActorShared<DownloadManager> download_manager)
        : td_(td), download_manager_(std::move(download_manager)) {
    }
    void on_progress(FileId file_id) final {
      send_update(file_id, false);
    }
    void on_download_ok(FileId file_id) final {
      send_update(file_id, true);
    }
    void on_download_error(FileId file_id, Status error) final {
      send_update(file_id, true);
    }

   private:
    Td *td_;
    ActorShared<DownloadManager> download_manager_;

    void send_update(FileId file_id, bool is_paused) const {
      auto td = G()->td().get_actor_unsafe();
      auto file_view = td->file_manager_->get_file_view(file_id);
      send_closure(download_manager_, &DownloadManager::update_file_download_state, file_id,
                   file_view.local_total_size(), file_view.size(), file_view.expected_size(), is_paused);
    }
  };
  return std::make_shared<Impl>(td, std::move(download_manager));
}

}  // namespace td