//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2026
//
// 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/VideosManager.h"

#include "td/telegram/AuthManager.h"
#include "td/telegram/Document.h"
#include "td/telegram/DocumentsManager.h"
#include "td/telegram/files/FileLocation.h"
#include "td/telegram/files/FileManager.h"
#include "td/telegram/Global.h"
#include "td/telegram/secret_api.h"
#include "td/telegram/Td.h"
#include "td/telegram/td_api.h"
#include "td/telegram/telegram_api.h"

#include "td/actor/actor.h"

#include "td/utils/logging.h"
#include "td/utils/misc.h"
#include "td/utils/SliceBuilder.h"
#include "td/utils/Status.h"

#include <cmath>

namespace td {

VideosManager::VideosManager(Td *td) : td_(td) {
}

VideosManager::~VideosManager() {
  Scheduler::instance()->destroy_on_scheduler(G()->get_gc_scheduler_id(), videos_);
}

int32 VideosManager::get_video_duration(FileId file_id) const {
  auto video = get_video(file_id);
  CHECK(video != nullptr);
  return video->duration;
}

const string &VideosManager::get_video_mime_type(FileId file_id) const {
  auto video = get_video(file_id);
  CHECK(video != nullptr);
  return video->mime_type;
}

td_api::object_ptr<td_api::video> VideosManager::get_video_object(FileId file_id,
                                                                  const vector<FileId> &alternative_file_ids) const {
  if (!file_id.is_valid()) {
    return nullptr;
  }

  auto video = get_video(file_id);
  CHECK(video != nullptr);
  auto thumbnail = get_thumbnail_object(td_->file_manager_.get(), video->thumbnail, video->animated_thumbnail);
  auto duration = video->duration;
  if ((duration == 0 || thumbnail == nullptr) && !alternative_file_ids.empty()) {
    int32 common_duration = 0;
    for (auto alternative_file_id : alternative_file_ids) {
      auto alternative_video = get_video(alternative_file_id);
      CHECK(alternative_video != nullptr);
      if (alternative_video->duration > 0) {
        if (common_duration == 0) {
          common_duration = alternative_video->duration;
        } else if (common_duration != alternative_video->duration) {
          common_duration = -1;
        }
      }
      if (thumbnail == nullptr) {
        thumbnail = get_thumbnail_object(td_->file_manager_.get(), alternative_video->thumbnail,
                                         alternative_video->animated_thumbnail);
      }
    }
    if (duration == 0 && common_duration > 0) {
      duration = common_duration;
    }
  }
  return td_api::make_object<td_api::video>(duration, video->dimensions.width, video->dimensions.height,
                                            video->file_name, video->mime_type, video->has_stickers,
                                            video->supports_streaming, get_minithumbnail_object(video->minithumbnail),
                                            std::move(thumbnail), td_->file_manager_->get_file_object(file_id));
}

td_api::object_ptr<td_api::storyVideo> VideosManager::get_story_video_object(FileId file_id) const {
  if (!file_id.is_valid()) {
    return nullptr;
  }

  auto video = get_video(file_id);
  CHECK(video != nullptr);
  auto thumbnail = get_thumbnail_object(td_->file_manager_.get(), video->thumbnail, video->animated_thumbnail);
  return td_api::make_object<td_api::storyVideo>(
      video->precise_duration, video->dimensions.width, video->dimensions.height, video->has_stickers,
      video->is_animation, get_minithumbnail_object(video->minithumbnail), std::move(thumbnail),
      video->preload_prefix_size, video->start_ts, td_->file_manager_->get_file_object(file_id));
}

td_api::object_ptr<td_api::alternativeVideo> VideosManager::get_alternative_video_object(
    FileId file_id, const vector<FileId> &hls_file_ids) const {
  auto video = get_video(file_id);
  CHECK(video != nullptr);
  auto file_view = td_->file_manager_->get_file_view(file_id);
  const auto *full_remote_location = file_view.get_full_remote_location();
  CHECK(full_remote_location != nullptr);
  CHECK(full_remote_location->is_document());
  int64 document_id = full_remote_location->get_id();
  auto name = PSTRING() << "mtproto:" << document_id;
  for (const auto &hls_file_id : hls_file_ids) {
    if (td_->documents_manager_->get_document_file_name(hls_file_id) == name) {
      return td_api::make_object<td_api::alternativeVideo>(
          document_id, video->dimensions.width, video->dimensions.height, video->codec,
          td_->file_manager_->get_file_object(hls_file_id), td_->file_manager_->get_file_object(file_id));
    }
  }
  return nullptr;
}

FileId VideosManager::on_get_video(unique_ptr<Video> new_video, bool replace) {
  auto file_id = new_video->file_id;
  CHECK(file_id.is_valid());
  LOG(INFO) << "Receive video " << file_id;
  auto &v = videos_[file_id];
  if (v == nullptr) {
    v = std::move(new_video);
  } else if (replace) {
    CHECK(v->file_id == new_video->file_id);
    if (v->mime_type != new_video->mime_type || v->file_name != new_video->file_name ||
        v->minithumbnail != new_video->minithumbnail || v->thumbnail != new_video->thumbnail ||
        v->animated_thumbnail != new_video->animated_thumbnail || v->duration != new_video->duration ||
        v->precise_duration != new_video->precise_duration || v->dimensions != new_video->dimensions ||
        v->supports_streaming != new_video->supports_streaming || v->is_animation != new_video->is_animation ||
        v->preload_prefix_size != new_video->preload_prefix_size ||
        std::fabs(v->start_ts - new_video->start_ts) > 1e-3 || v->codec != new_video->codec) {
      LOG(DEBUG) << "Video " << file_id << " info has changed";
      v->mime_type = std::move(new_video->mime_type);
      v->file_name = std::move(new_video->file_name);
      v->minithumbnail = std::move(new_video->minithumbnail);
      v->thumbnail = std::move(new_video->thumbnail);
      v->animated_thumbnail = std::move(new_video->animated_thumbnail);
      v->duration = new_video->duration;
      v->precise_duration = new_video->precise_duration;
      v->dimensions = new_video->dimensions;
      v->supports_streaming = new_video->supports_streaming;
      v->is_animation = new_video->is_animation;
      v->preload_prefix_size = new_video->preload_prefix_size;
      v->start_ts = new_video->start_ts;
      v->codec = std::move(new_video->codec);
    }
    if (v->has_stickers != new_video->has_stickers && new_video->has_stickers) {
      v->has_stickers = new_video->has_stickers;
    }
    if (v->sticker_file_ids != new_video->sticker_file_ids && !new_video->sticker_file_ids.empty()) {
      v->sticker_file_ids = std::move(new_video->sticker_file_ids);
    }
  }
  return file_id;
}

const VideosManager::Video *VideosManager::get_video(FileId file_id) const {
  return videos_.get_pointer(file_id);
}

FileId VideosManager::get_video_thumbnail_file_id(FileId file_id) const {
  auto video = get_video(file_id);
  CHECK(video != nullptr);
  return video->thumbnail.file_id;
}

FileId VideosManager::get_video_animated_thumbnail_file_id(FileId file_id) const {
  auto video = get_video(file_id);
  CHECK(video != nullptr);
  return video->animated_thumbnail.file_id;
}

void VideosManager::delete_video_thumbnail(FileId file_id) {
  auto &video = videos_[file_id];
  CHECK(video != nullptr);
  video->thumbnail = PhotoSize();
  video->animated_thumbnail = AnimationSize();
}

FileId VideosManager::dup_video(FileId new_id, FileId old_id) {
  const Video *old_video = get_video(old_id);
  CHECK(old_video != nullptr);
  auto &new_video = videos_[new_id];
  if (new_video != nullptr) {
    return new_id;
  }
  new_video = make_unique<Video>(*old_video);
  new_video->file_id = new_id;
  return new_id;
}

void VideosManager::merge_videos(FileId new_id, FileId old_id) {
  CHECK(old_id.is_valid() && new_id.is_valid());
  CHECK(new_id != old_id);

  LOG(INFO) << "Merge videos " << new_id << " and " << old_id;
  const Video *old_ = get_video(old_id);
  CHECK(old_ != nullptr);

  const auto *new_ = get_video(new_id);
  if (new_ == nullptr) {
    dup_video(new_id, old_id);
  } else if (!old_->mime_type.empty() && old_->mime_type != new_->mime_type) {
    LOG(INFO) << "Video has changed: mime_type = (" << old_->mime_type << ", " << new_->mime_type << ")";
  }
  LOG_STATUS(td_->file_manager_->merge(new_id, old_id));
}

void VideosManager::create_video(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, double precise_duration,
                                 Dimensions dimensions, bool supports_streaming, bool is_animation,
                                 int32 preload_prefix_size, double start_ts, string &&codec, bool replace) {
  auto v = make_unique<Video>();
  v->file_id = file_id;
  v->file_name = std::move(file_name);
  v->mime_type = std::move(mime_type);
  v->duration = max(duration, 0);
  v->precise_duration = duration == 0 ? 0.0 : clamp(precise_duration, duration - 1.0, duration + 0.0);
  v->dimensions = dimensions;
  if (!td_->auth_manager_->is_bot()) {
    v->minithumbnail = std::move(minithumbnail);
  }
  v->thumbnail = std::move(thumbnail);
  v->animated_thumbnail = std::move(animated_thumbnail);
  v->supports_streaming = supports_streaming;
  v->is_animation = is_animation;
  v->preload_prefix_size = preload_prefix_size;
  v->start_ts = start_ts;
  v->has_stickers = has_stickers;
  v->sticker_file_ids = std::move(sticker_file_ids);
  v->codec = std::move(codec);
  on_get_video(std::move(v), replace);
}

SecretInputMedia VideosManager::get_secret_input_media(
    FileId video_file_id, telegram_api::object_ptr<telegram_api::InputEncryptedFile> input_file, const string &caption,
    BufferSlice thumbnail, int32 layer) const {
  const Video *video = get_video(video_file_id);
  CHECK(video != nullptr);
  auto file_view = td_->file_manager_->get_file_view(video_file_id);
  if (!file_view.is_encrypted_secret() || file_view.encryption_key().empty()) {
    return SecretInputMedia{};
  }
  const auto *main_remote_location = file_view.get_main_remote_location();
  if (main_remote_location != nullptr) {
    input_file = main_remote_location->as_input_encrypted_file();
  }
  if (!input_file) {
    return {};
  }
  if (video->thumbnail.file_id.is_valid() && thumbnail.empty()) {
    return {};
  }
  vector<secret_api::object_ptr<secret_api::DocumentAttribute>> attributes;
  attributes.emplace_back(secret_api::make_object<secret_api::documentAttributeVideo>(
      0, false, video->duration, video->dimensions.width, video->dimensions.height));

  return {std::move(input_file),
          std::move(thumbnail),
          video->thumbnail.dimensions,
          video->mime_type,
          file_view,
          std::move(attributes),
          caption,
          layer};
}

tl_object_ptr<telegram_api::InputMedia> VideosManager::get_input_media(
    FileId file_id, telegram_api::object_ptr<telegram_api::InputFile> input_file,
    telegram_api::object_ptr<telegram_api::InputFile> input_thumbnail, const Photo &cover, int32 start_timestamp,
    int32 ttl, bool has_spoiler) const {
  if (!file_id.is_valid()) {
    LOG_IF(ERROR, ttl == 0) << "Video has invalid file_id";
    return nullptr;
  }
  telegram_api::object_ptr<telegram_api::InputPhoto> input_cover;
  if (!cover.is_empty()) {
    auto cover_file_id = get_photo_any_file_id(cover);
    if (cover_file_id.is_valid()) {
      auto cover_file_view = td_->file_manager_->get_file_view(cover_file_id);
      if (!cover_file_view.is_encrypted()) {
        const auto *main_remote_location = cover_file_view.get_main_remote_location();
        if (main_remote_location != nullptr && !main_remote_location->is_web()) {
          input_cover = main_remote_location->as_input_photo();
        }
      }
    }
  }
  auto file_view = td_->file_manager_->get_file_view(file_id);
  if (file_view.is_encrypted()) {
    return nullptr;
  }
  const auto *main_remote_location = file_view.get_main_remote_location();
  if (main_remote_location != nullptr && !main_remote_location->is_web() && input_file == nullptr) {
    int32 flags = 0;
    if (ttl != 0) {
      flags |= telegram_api::inputMediaDocument::TTL_SECONDS_MASK;
    }
    if (start_timestamp != 0) {
      flags |= telegram_api::inputMediaDocument::VIDEO_TIMESTAMP_MASK;
    }
    if (input_cover != nullptr) {
      flags |= telegram_api::inputMediaDocument::VIDEO_COVER_MASK;
    }
    return telegram_api::make_object<telegram_api::inputMediaDocument>(
        flags, has_spoiler, main_remote_location->as_input_document(), std::move(input_cover), start_timestamp, ttl,
        string());
  }
  const auto *url = file_view.get_url();
  if (url != nullptr) {
    int32 flags = 0;
    if (ttl != 0) {
      flags |= telegram_api::inputMediaDocumentExternal::TTL_SECONDS_MASK;
    }
    if (start_timestamp != 0) {
      flags |= telegram_api::inputMediaDocumentExternal::VIDEO_TIMESTAMP_MASK;
    }
    if (input_cover != nullptr) {
      flags |= telegram_api::inputMediaDocumentExternal::VIDEO_COVER_MASK;
    }
    return telegram_api::make_object<telegram_api::inputMediaDocumentExternal>(flags, has_spoiler, *url, ttl,
                                                                               std::move(input_cover), start_timestamp);
  }

  if (input_file != nullptr) {
    const Video *video = get_video(file_id);
    CHECK(video != nullptr);

    vector<telegram_api::object_ptr<telegram_api::DocumentAttribute>> attributes;
    {
      int32 attribute_flags = 0;
      if (video->start_ts > 0.0) {
        attribute_flags |= telegram_api::documentAttributeVideo::VIDEO_START_TS_MASK;
      }
      attributes.push_back(telegram_api::make_object<telegram_api::documentAttributeVideo>(
          attribute_flags, false, video->supports_streaming, video->is_animation, video->precise_duration,
          video->dimensions.width, video->dimensions.height, 0, video->start_ts, string()));
    }
    if (!video->file_name.empty()) {
      attributes.push_back(telegram_api::make_object<telegram_api::documentAttributeFilename>(video->file_name));
    }
    int32 flags = 0;
    vector<tl_object_ptr<telegram_api::InputDocument>> added_stickers;
    if (video->has_stickers) {
      flags |= telegram_api::inputMediaUploadedDocument::STICKERS_MASK;
      added_stickers = td_->file_manager_->get_input_documents(video->sticker_file_ids);
    }
    string mime_type = video->mime_type;
    if (!begins_with(mime_type, "video/") || ttl > 0) {
      mime_type = "video/mp4";
    }
    if (ttl != 0) {
      flags |= telegram_api::inputMediaUploadedDocument::TTL_SECONDS_MASK;
    }
    if (input_thumbnail != nullptr) {
      flags |= telegram_api::inputMediaUploadedDocument::THUMB_MASK;
    }
    if (start_timestamp != 0) {
      flags |= telegram_api::inputMediaUploadedDocument::VIDEO_TIMESTAMP_MASK;
    }
    if (input_cover != nullptr) {
      flags |= telegram_api::inputMediaUploadedDocument::VIDEO_COVER_MASK;
    }
    return telegram_api::make_object<telegram_api::inputMediaUploadedDocument>(
        flags, true, false, has_spoiler, std::move(input_file), std::move(input_thumbnail), mime_type,
        std::move(attributes), std::move(added_stickers), std::move(input_cover), start_timestamp, ttl);
  } else {
    CHECK(main_remote_location == nullptr);
  }

  return nullptr;
}

telegram_api::object_ptr<telegram_api::InputMedia> VideosManager::get_story_document_input_media(
    FileId file_id, double main_frame_timestamp) const {
  auto file_view = td_->file_manager_->get_file_view(file_id);
  if (file_view.is_encrypted()) {
    return nullptr;
  }
  const auto *main_remote_location = file_view.get_main_remote_location();
  if (main_remote_location == nullptr || main_remote_location->is_web()) {
    return nullptr;
  }

  const Video *video = get_video(file_id);
  CHECK(video != nullptr);

  vector<telegram_api::object_ptr<telegram_api::DocumentAttribute>> attributes;
  {
    int32 attribute_flags = 0;
    if (main_frame_timestamp > 0.0) {
      attribute_flags |= telegram_api::documentAttributeVideo::VIDEO_START_TS_MASK;
    }
    attributes.push_back(telegram_api::make_object<telegram_api::documentAttributeVideo>(
        attribute_flags, false, video->supports_streaming, video->is_animation, video->precise_duration,
        video->dimensions.width, video->dimensions.height, 0, main_frame_timestamp, string()));
  }
  if (!video->file_name.empty()) {
    attributes.push_back(telegram_api::make_object<telegram_api::documentAttributeFilename>(video->file_name));
  }
  int32 flags = 0;
  vector<telegram_api::object_ptr<telegram_api::InputDocument>> added_stickers;
  if (video->has_stickers) {
    flags |= telegram_api::inputMediaUploadedDocument::STICKERS_MASK;
    added_stickers = td_->file_manager_->get_input_documents(video->sticker_file_ids);
  }
  string mime_type = video->mime_type;
  if (!begins_with(mime_type, "video/")) {
    mime_type = "video/mp4";
  }
  return telegram_api::make_object<telegram_api::inputMediaUploadedDocument>(
      flags, true, false, false,
      telegram_api::make_object<telegram_api::inputFileStoryDocument>(main_remote_location->as_input_document()),
      nullptr, mime_type, std::move(attributes), std::move(added_stickers), nullptr, 0, 0);
}

telegram_api::object_ptr<telegram_api::InputMedia> VideosManager::get_video_cover_input_media(
    FileId file_id, bool force, bool allow_external) const {
  auto input_media = get_input_media(file_id, nullptr, nullptr, Photo(), 0, 0, false);
  if (input_media == nullptr || (!allow_external && input_media->get_id() != telegram_api::inputMediaDocument::ID)) {
    return nullptr;
  }
  auto file_reference = FileManager::extract_file_reference(input_media);
  if (file_reference == FileReferenceView::invalid_file_reference()) {
    if (!force) {
      LOG(INFO) << "Have invalid file reference for video cover " << file_id;
      return nullptr;
    }
  }
  return input_media;
}

FileId VideosManager::get_live_photo_video_file_id(telegram_api::object_ptr<telegram_api::Document> document,
                                                   DialogId owner_dialog_id, bool is_self_destructing) const {
  CHECK(document != nullptr);
  int32 video_id = document->get_id();
  if (video_id == telegram_api::documentEmpty::ID) {
    LOG(ERROR) << "Receive empty video document in a live photo";
    return FileId();
  }
  CHECK(video_id == telegram_api::document::ID);
  auto video = telegram_api::move_object_as<telegram_api::document>(document);
  auto parsed_document = td_->documents_manager_->on_get_document(
      std::move(video), owner_dialog_id, is_self_destructing, true, nullptr, Document::Type::Video);
  if (parsed_document.is_empty() || parsed_document.type != Document::Type::Video) {
    LOG(ERROR) << "Receive invalid live photo video " << parsed_document;
    return FileId();
  }
  return parsed_document.file_id;
}

string VideosManager::get_video_search_text(FileId file_id) const {
  auto *video = get_video(file_id);
  CHECK(video != nullptr);
  return video->file_name;
}

}  // namespace td
