// Copyright 2024 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "sharing/attachment_container.h"
#include <cstdint>
#include <memory>
#include <optional>
#include <string>
#include <utility>
#include <vector>
#include "absl/memory/memory.h"
#include "sharing/file_attachment.h"
#include "sharing/text_attachment.h"
#include "sharing/wifi_credentials_attachment.h"

namespace nearby::sharing {

AttachmentContainer::Builder&
AttachmentContainer::Builder::ReserveAttachmentsCount(
    int text_attachments_count, int file_attachments_count,
    int wifi_credentials_attachments_count) {
  text_attachments_.reserve(text_attachments_count);
  file_attachments_.reserve(file_attachments_count);
  wifi_credentials_attachments_.reserve(wifi_credentials_attachments_count);
  return *this;
}

AttachmentContainer::Builder& AttachmentContainer::Builder::AddTextAttachment(
    TextAttachment text_attachment) {
  text_attachments_.push_back(std::move(text_attachment));
  return *this;
}

AttachmentContainer::Builder& AttachmentContainer::Builder::AddFileAttachment(
    FileAttachment file_attachment) {
  file_attachments_.push_back(std::move(file_attachment));
  return *this;
}

AttachmentContainer::Builder&
AttachmentContainer::Builder::AddWifiCredentialsAttachment(
    WifiCredentialsAttachment wifi_credentials_attachment) {
  wifi_credentials_attachments_.push_back(
      std::move(wifi_credentials_attachment));
  return *this;
}

std::unique_ptr<AttachmentContainer> AttachmentContainer::Builder::Build() {
  return absl::WrapUnique(new AttachmentContainer(
      std::move(text_attachments_), std::move(file_attachments_),
      std::move(wifi_credentials_attachments_)));
}

AttachmentContainer::AttachmentContainer(
    std::vector<TextAttachment> text_attachments,
    std::vector<FileAttachment> file_attachments,
    std::vector<WifiCredentialsAttachment> wifi_credentials_attachments)
    : text_attachments_(std::move(text_attachments)),
      file_attachments_(std::move(file_attachments)),
      wifi_credentials_attachments_(std::move(wifi_credentials_attachments)) {
  BuildIndex();
}

AttachmentContainer::AttachmentContainer(AttachmentContainer&& other) {
  text_attachments_ = std::move(other.text_attachments_);
  file_attachments_ = std::move(other.file_attachments_);
  wifi_credentials_attachments_ =
      std::move(other.wifi_credentials_attachments_);
  BuildIndex();
}

AttachmentContainer& AttachmentContainer::operator=(
    AttachmentContainer&& other) {
  text_attachments_ = std::move(other.text_attachments_);
  file_attachments_ = std::move(other.file_attachments_);
  wifi_credentials_attachments_ =
      std::move(other.wifi_credentials_attachments_);
  BuildIndex();
  return *this;
}

int64_t AttachmentContainer::GetTotalAttachmentsSize() const {
  int64_t size_in_bytes = 0;

  for (const auto& file : file_attachments_) {
    size_in_bytes += file.size();
  }

  for (const auto& text : text_attachments_) {
    size_in_bytes += text.size();
  }

  for (const auto& wifi_credentials : wifi_credentials_attachments_) {
    size_in_bytes += wifi_credentials.size();
  }

  return size_in_bytes;
}

int64_t AttachmentContainer::GetStorageSize() const {
  int64_t size_in_bytes = 0;

  // Only files require disk storage.
  for (const auto& file : file_attachments_) {
    size_in_bytes += file.size();
  }

  return size_in_bytes;
}

void AttachmentContainer::ClearAttachments() {
  // Reset file paths for file attachments.
  for (auto& file : file_attachments_)
    file.set_file_path(std::nullopt);

  // Reset body of text attachments.
  for (auto& text : text_attachments_)
    text.set_text_body(std::string());

  // Reset password of Wi-Fi credentials attachments.
  for (auto& wifi_credentials : wifi_credentials_attachments_) {
    wifi_credentials.set_password(std::string());
    wifi_credentials.set_is_hidden(false);
  }
}

void AttachmentContainer::BuildIndex() {
  for (const auto& text : text_attachments_) {
    attachment_id_map_[text.id()] = &text;
  }
  for (const auto& file : file_attachments_) {
    attachment_id_map_[file.id()] = &file;
  }
  for (const auto& wifi_credentials : wifi_credentials_attachments_) {
    attachment_id_map_[wifi_credentials.id()] = &wifi_credentials;
  }
}

}  // namespace nearby::sharing