/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 sw=2 et tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef DeviceStorage_h
#define DeviceStorage_h

#include "nsIDOMDeviceStorage.h"
#include "nsIFile.h"
#include "nsIPrincipal.h"
#include "nsIObserver.h"
#include "nsDOMEventTargetHelper.h"
#include "mozilla/StaticPtr.h"

class DeviceStorageFile MOZ_FINAL
  : public nsISupports {
public:
  nsCOMPtr<nsIFile> mFile;
  nsString mPath;
  nsString mStorageType;
  nsString mRootDir;
  bool mEditable;

  // Used when the path will be set later via SetPath.
  DeviceStorageFile(const nsAString& aStorageType);
  // Used for non-enumeration purposes.
  DeviceStorageFile(const nsAString& aStorageType, const nsAString& aPath);
  // Used for enumerations. When you call Enumerate, you can pass in a directory to enumerate
  // and the results that are returned are relative to that directory, files related to an
  // enumeration need to know the "root of the enumeration" directory.
  DeviceStorageFile(const nsAString& aStorageType, const nsAString& aRootDir, const nsAString& aPath);

  void SetPath(const nsAString& aPath);
  void SetEditable(bool aEditable);

  NS_DECL_ISUPPORTS

  // we want to make sure that the names of file can't reach
  // outside of the type of storage the user asked for.
  bool IsSafePath();
  bool IsSafePath(const nsAString& aPath);

  nsresult Remove();
  nsresult Write(nsIInputStream* aInputStream);
  nsresult Write(InfallibleTArray<uint8_t>& bits);
  void CollectFiles(nsTArray<nsRefPtr<DeviceStorageFile> > &aFiles, PRTime aSince = 0);
  void collectFilesInternal(nsTArray<nsRefPtr<DeviceStorageFile> > &aFiles, PRTime aSince, nsAString& aRootPath);

  static void DirectoryDiskUsage(nsIFile* aFile, uint64_t* aSoFar, const nsAString& aStorageType);
  static void GetRootDirectoryForType(const nsAString& aType,
                                      const nsAString& aVolName,
                                      nsIFile** aFile);
private:
  void Init(const nsAString& aStorageType);
  void NormalizeFilePath();
  void AppendRelativePath(const nsAString& aPath);
};

/*
  The FileUpdateDispatcher converts file-watcher-notify
  observer events to file-watcher-update events.  This is
  used to be able to broadcast events from one child to
  another child in B2G.  (f.e., if one child decides to add
  a file, we want to be able to able to send a onchange
  notifications to every other child watching that device
  storage object).

  We create this object (via GetSingleton) in two places:
    * ContentParent::Init (for IPC)
    * nsDOMDeviceStorage::Init (for non-ipc)
*/
class FileUpdateDispatcher MOZ_FINAL
  : public nsIObserver
{
 public:
  NS_DECL_ISUPPORTS
  NS_DECL_NSIOBSERVER

  static FileUpdateDispatcher* GetSingleton();
 private:
  static mozilla::StaticRefPtr<FileUpdateDispatcher> sSingleton;
};

class nsDOMDeviceStorage MOZ_FINAL
  : public nsDOMEventTargetHelper
  , public nsIDOMDeviceStorage
  , public nsIObserver
{
public:
  NS_DECL_ISUPPORTS_INHERITED
  NS_DECL_NSIDOMDEVICESTORAGE

  NS_DECL_NSIOBSERVER
  NS_DECL_NSIDOMEVENTTARGET
  virtual void AddEventListener(const nsAString& aType,
                                nsIDOMEventListener* aListener,
                                bool aUseCapture,
                                const mozilla::dom::Nullable<bool>& aWantsUntrusted,
                                mozilla::ErrorResult& aRv) MOZ_OVERRIDE;
  virtual void RemoveEventListener(const nsAString& aType,
                                   nsIDOMEventListener* aListener,
                                   bool aUseCapture,
                                   mozilla::ErrorResult& aRv) MOZ_OVERRIDE;

  nsDOMDeviceStorage();

  nsresult Init(nsPIDOMWindow* aWindow, const nsAString &aType, const nsAString &aVolName);

  void SetRootDirectoryForType(const nsAString& aType, const nsAString &aVolName);

  static void GetOrderedVolumeNames(const nsAString &aType,
                                    nsTArray<nsString> &aVolumeNames);

  static void CreateDeviceStoragesFor(nsPIDOMWindow* aWin,
                                      const nsAString &aType,
                                      nsTArray<nsRefPtr<nsDOMDeviceStorage> > &aStores);
  void Shutdown();

private:
  ~nsDOMDeviceStorage();

  nsresult GetInternal(const JS::Value & aName,
                       JSContext* aCx,
                       nsIDOMDOMRequest** aRetval,
                       bool aEditable);

  nsresult EnumerateInternal(const JS::Value & aName,
                             const JS::Value & aOptions,
                             JSContext* aCx,
                             uint8_t aArgc,
                             bool aEditable,
                             nsIDOMDOMCursor** aRetval);

  nsString mStorageType;
  nsCOMPtr<nsIFile> mRootDirectory;
  nsString mVolumeName;

  nsCOMPtr<nsIPrincipal> mPrincipal;

  bool mIsWatchingFile;
  bool mAllowedToWatchFile;

  nsresult Notify(const char* aReason, class DeviceStorageFile* aFile);

  friend class WatchFileEvent;
  friend class DeviceStorageRequest;

#ifdef MOZ_WIDGET_GONK
  void DispatchMountChangeEvent(nsAString& aType);
#endif

  // nsIDOMDeviceStorage.type
  enum {
      DEVICE_STORAGE_TYPE_DEFAULT = 0,
      DEVICE_STORAGE_TYPE_SHARED,
      DEVICE_STORAGE_TYPE_EXTERNAL
  };
};

#endif
