// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef COMPONENTS_DOWNLOAD_PUBLIC_BACKGROUND_SERVICE_DOWNLOAD_METADATA_H_
#define COMPONENTS_DOWNLOAD_PUBLIC_BACKGROUND_SERVICE_DOWNLOAD_METADATA_H_

#include <optional>
#include <vector>

#include "base/component_export.h"
#include "base/files/file_path.h"
#include "base/memory/scoped_refptr.h"
#include "build/blink_buildflags.h"
#include "build/build_config.h"
#include "components/download/public/background_service/download_params.h"
#include "net/http/http_response_headers.h"
#include "url/gurl.h"

#if BUILDFLAG(USE_BLINK)
#include "storage/browser/blob/blob_data_handle.h"
#endif

namespace download {

// Struct that contains information about successfully completed downloads.
struct COMPONENT_EXPORT(COMPONENTS_DOWNLOAD_PUBLIC_BACKGROUND_SERVICE)
    CompletionInfo {
  // The file path for the download file. In incognito mode, use |blob_handle_|
  // to retrieve data.
  base::FilePath path;

#if BUILDFLAG(USE_BLINK)
  // The blob data handle that contains download data.
  // Will be available after the download is completed in incognito mode.
  std::optional<storage::BlobDataHandle> blob_handle;
#endif

  // Download file size in bytes.
  uint64_t bytes_downloaded = 0u;

  // The url chain of the download. Download may encounter redirects, and
  // fetches the content from the last url in the chain.
  // This will reflect the initial request's chain and does not take into
  // account changed values during retries/resumptions.
  std::vector<GURL> url_chain;

  // The response headers for the download request.
  // This will reflect the initial response's headers and does not take into
  // account changed values during retries/resumptions.
  scoped_refptr<const net::HttpResponseHeaders> response_headers;

  // An optional base::HexEncoded SHA-256 hash (if available) of the file
  // contents.  If empty there is no available hash value.
  std::string hash256;

  // The custom data sent back to clients when download is completed or failed.
  DownloadParams::CustomData custom_data;

  CompletionInfo();
  CompletionInfo(
      const base::FilePath& path,
      uint64_t bytes_downloaded,
      const std::vector<GURL>& url_chain,
      scoped_refptr<const net::HttpResponseHeaders> response_headers);
  CompletionInfo(const base::FilePath& path, uint64_t bytes_downloaded);
  CompletionInfo(const CompletionInfo& other);
  ~CompletionInfo();
  bool operator==(const CompletionInfo& other) const;
};

// Struct to describe general download status.
struct COMPONENT_EXPORT(COMPONENTS_DOWNLOAD_PUBLIC_BACKGROUND_SERVICE)
    DownloadMetaData {
  // The GUID of the download.
  std::string guid;

  // Data that has been fetched. Can be used to get the current size of
  // uncompleted download.
  uint64_t current_size;

  // Whether the entry is currently paused by the client.
  bool paused;

  // Info about successfully completed download, or null for in-progress
  // download. Failed download will not be persisted and exposed as meta data.
  std::optional<CompletionInfo> completion_info;

  DownloadMetaData();
  ~DownloadMetaData();
  DownloadMetaData(const DownloadMetaData& other);
  bool operator==(const DownloadMetaData& other) const;
};

}  // namespace download

#endif  // COMPONENTS_DOWNLOAD_PUBLIC_BACKGROUND_SERVICE_DOWNLOAD_METADATA_H_