// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef WEBKIT_FILEAPI_FILE_SYSTEM_UTIL_H_
#define WEBKIT_FILEAPI_FILE_SYSTEM_UTIL_H_

#include <string>
#include <vector>

#include "base/file_path.h"
#include "base/platform_file.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebFileError.h"
#include "webkit/fileapi/file_system_types.h"
#include "webkit/quota/quota_types.h"
#include "webkit/storage/webkit_storage_export.h"

class GURL;

namespace fileapi {

extern const char kPersistentDir[];
extern const char kTemporaryDir[];
extern const char kExternalDir[];
extern const char kIsolatedDir[];
extern const char kTestDir[];

class WEBKIT_STORAGE_EXPORT VirtualPath {
 public:
  static const FilePath::CharType kRoot[];
  static const FilePath::CharType kSeparator;

  // Use this instead of base::FilePath::BaseName when operating on virtual
  // paths. base::FilePath::BaseName will get confused by ':' on Windows when it
  // looks like a drive letter separator; this will treat it as just another
  // character.
  static base::FilePath BaseName(const base::FilePath& virtual_path);

  // Likewise, use this instead of base::FilePath::GetComponents when operating on
  // virtual paths.
  // Note that this assumes very clean input, with no leading slash, and it will
  // not evaluate '.' or '..' components.
  static void GetComponents(const base::FilePath& path,
      std::vector<base::FilePath::StringType>* components);

  // Returns a path name ensuring that it begins with kRoot and all path
  // separators are forward slashes /.
  static FilePath::StringType GetNormalizedFilePath(const FilePath& path);

  // Returns true if the given path begins with kRoot.
  static bool IsAbsolute(const FilePath::StringType& path);
};

// Returns the root URI of the filesystem that can be specified by a pair of
// |origin_url| and |type|.  The returned URI can be used as a root path
// of the filesystem (e.g. <returned_URI> + "/relative/path" will compose
// a path pointing to the entry "/relative/path" in the filesystem).
//
// For Isolated filesystem this returns the 'common' root part, e.g.
// returns URL without the filesystem ID.
//
// |type| needs to be public type as the returned URI is given to the renderer.
WEBKIT_STORAGE_EXPORT GURL GetFileSystemRootURI(const GURL& origin_url,
                                         FileSystemType type);

// Returns the name for the filesystem that is specified by a pair of
// |origin_url| and |type|.
// (The name itself is neither really significant nor a formal identifier
// but can be read as the .name field of the returned FileSystem object
// as a user-friendly name in the javascript layer).
//
// |type| needs to be public type as the returned name is given to the renderer.
//
// Example:
//   The name for a TEMPORARY filesystem of "http://www.example.com:80/"
//   should look like: "http_www.example.host_80:temporary"
WEBKIT_STORAGE_EXPORT std::string GetFileSystemName(const GURL& origin_url,
                                             FileSystemType type);

// Converts FileSystemType |type| to/from the StorageType |storage_type| that
// is used for the unified quota system.
// (Basically this naively maps TEMPORARY storage type to TEMPORARY filesystem
// type, PERSISTENT storage type to PERSISTENT filesystem type and vice versa.)
WEBKIT_STORAGE_EXPORT FileSystemType QuotaStorageTypeToFileSystemType(
    quota::StorageType storage_type);
WEBKIT_STORAGE_EXPORT quota::StorageType FileSystemTypeToQuotaStorageType(
    FileSystemType type);

// Returns the origin identifier string for the given |url| and vice versa.
// The origin identifier string is a serialized form of a security origin
// and can be used as a path name as it contains no "/" or other possibly
// unsafe characters. (See WebKit's SecurityOrigin code for more details.)
//
// Example:
//   "http://www.example.com:80/"'s identifier should look like:
//   "http_www.example.host_80"
WEBKIT_STORAGE_EXPORT std::string GetOriginIdentifierFromURL(const GURL& url);
WEBKIT_STORAGE_EXPORT GURL GetOriginURLFromIdentifier(
    const std::string& origin_identifier);

// Returns the string representation of the given filesystem |type|.
// Returns an empty string if the |type| is invalid.
WEBKIT_STORAGE_EXPORT std::string GetFileSystemTypeString(FileSystemType type);

// Sets type to FileSystemType enum that corresponds to the string name.
// Returns false if the |type_string| is invalid.
WEBKIT_STORAGE_EXPORT bool GetFileSystemPublicType(
    std::string type_string,
    WebKit::WebFileSystem::Type* type);

// Encodes |file_path| to a string.
// Following conditions should be held:
//  - StringToFilePath(FilePathToString(path)) == path
//  - StringToFilePath(FilePathToString(path) + "/" + "SubDirectory") ==
//    path.AppendASCII("SubDirectory");
//
// TODO(tzik): Replace CreateFilePath and FilePathToString in
// third_party/leveldatabase/env_chromium.cc with them.
WEBKIT_STORAGE_EXPORT std::string FilePathToString(const base::FilePath& file_path);

// Decode a file path from |file_path_string|.
WEBKIT_STORAGE_EXPORT base::FilePath StringToFilePath(
    const std::string& file_path_string);

// File error conversion
WEBKIT_STORAGE_EXPORT WebKit::WebFileError PlatformFileErrorToWebFileError(
    base::PlatformFileError error_code);

// Generate a file system name for the given arguments. Should only be used by
// platform apps.
WEBKIT_STORAGE_EXPORT std::string GetIsolatedFileSystemName(
    const GURL& origin_url,
    const std::string& filesystem_id);

// Find the file system id from |filesystem_name|. Should only be used by
// platform apps. This function will return false if the file system name is
// not of the form {origin}:Isolated_{id}, and will also check that there is an
// origin and id present. It will not check that the origin or id are valid.
WEBKIT_STORAGE_EXPORT bool CrackIsolatedFileSystemName(
    const std::string& filesystem_name,
    std::string* filesystem_id);

// Returns the root URI for an isolated filesystem for origin |origin_url|
// and |filesystem_id|. If the |optional_root_name| is given the resulting
// root URI will point to the subfolder within the isolated filesystem.
WEBKIT_STORAGE_EXPORT std::string GetIsolatedFileSystemRootURIString(
    const GURL& origin_url,
    const std::string& filesystem_id,
    const std::string& optional_root_name);

}  // namespace fileapi

#endif  // WEBKIT_FILEAPI_FILE_SYSTEM_UTIL_H_