/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 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 mozilla_dom_idbdatabase_h__
#define mozilla_dom_idbdatabase_h__

#include "mozilla/Attributes.h"
#include "mozilla/dom/IDBTransactionBinding.h"
#include "mozilla/dom/StorageTypeBinding.h"
#include "mozilla/dom/quota/PersistenceType.h"
#include "mozilla/DOMEventTargetHelper.h"
#include "nsAutoPtr.h"
#include "nsDataHashtable.h"
#include "nsHashKeys.h"
#include "nsString.h"
#include "nsTHashtable.h"

class nsIEventTarget;
class nsIGlobalObject;

namespace mozilla {

class ErrorResult;
class EventChainPostVisitor;

namespace dom {

class Blob;
class DOMStringList;
class IDBFactory;
class IDBMutableFile;
class IDBObjectStore;
struct IDBObjectStoreParameters;
class IDBOpenDBRequest;
class IDBRequest;
class IDBTransaction;
template <class>
class Optional;
class StringOrStringSequence;

namespace indexedDB {
class BackgroundDatabaseChild;
class DatabaseSpec;
class PBackgroundIDBDatabaseFileChild;
}  // namespace indexedDB

class IDBDatabase final : public DOMEventTargetHelper {
  typedef mozilla::dom::indexedDB::DatabaseSpec DatabaseSpec;
  typedef mozilla::dom::StorageType StorageType;
  typedef mozilla::dom::quota::PersistenceType PersistenceType;

  class Observer;
  friend class Observer;

  friend class IDBObjectStore;
  friend class IDBIndex;

  // The factory must be kept alive when IndexedDB is used in multiple
  // processes. If it dies then the entire actor tree will be destroyed with it
  // and the world will explode.
  RefPtr<IDBFactory> mFactory;

  nsAutoPtr<DatabaseSpec> mSpec;

  // Normally null except during a versionchange transaction.
  nsAutoPtr<DatabaseSpec> mPreviousSpec;

  indexedDB::BackgroundDatabaseChild* mBackgroundActor;

  nsTHashtable<nsPtrHashKey<IDBTransaction>> mTransactions;

  nsDataHashtable<nsISupportsHashKey,
                  indexedDB::PBackgroundIDBDatabaseFileChild*>
      mFileActors;

  RefPtr<Observer> mObserver;

  // Weak refs, IDBMutableFile strongly owns this IDBDatabase object.
  nsTArray<IDBMutableFile*> mLiveMutableFiles;

  const bool mFileHandleDisabled;
  bool mClosed;
  bool mInvalidated;
  bool mQuotaExceeded;
  bool mIncreasedActiveDatabaseCount;

 public:
  static already_AddRefed<IDBDatabase> Create(
      IDBOpenDBRequest* aRequest, IDBFactory* aFactory,
      indexedDB::BackgroundDatabaseChild* aActor, DatabaseSpec* aSpec);

  void AssertIsOnOwningThread() const
#ifdef DEBUG
      ;
#else
  {
  }
#endif

  nsIEventTarget* EventTarget() const;

  const nsString& Name() const;

  void GetName(nsAString& aName) const {
    AssertIsOnOwningThread();

    aName = Name();
  }

  uint64_t Version() const;

  already_AddRefed<Document> GetOwnerDocument() const;

  void Close() {
    AssertIsOnOwningThread();

    CloseInternal();
  }

  bool IsClosed() const {
    AssertIsOnOwningThread();

    return mClosed;
  }

  void Invalidate();

  // Whether or not the database has been invalidated. If it has then no further
  // transactions for this database will be allowed to run.
  bool IsInvalidated() const {
    AssertIsOnOwningThread();

    return mInvalidated;
  }

  void SetQuotaExceeded() { mQuotaExceeded = true; }

  void EnterSetVersionTransaction(uint64_t aNewVersion);

  void ExitSetVersionTransaction();

  // Called when a versionchange transaction is aborted to reset the
  // DatabaseInfo.
  void RevertToPreviousState();

  IDBFactory* Factory() const {
    AssertIsOnOwningThread();

    return mFactory;
  }

  void RegisterTransaction(IDBTransaction* aTransaction);

  void UnregisterTransaction(IDBTransaction* aTransaction);

  void AbortTransactions(bool aShouldWarn);

  indexedDB::PBackgroundIDBDatabaseFileChild* GetOrCreateFileActorForBlob(
      Blob* aBlob);

  void NoteFinishedFileActor(
      indexedDB::PBackgroundIDBDatabaseFileChild* aFileActor);

  void NoteActiveTransaction();

  void NoteInactiveTransaction();

  // XXX This doesn't really belong here... It's only needed for IDBMutableFile
  //     serialization and should be removed or fixed someday.
  nsresult GetQuotaInfo(nsACString& aOrigin, PersistenceType* aPersistenceType);

  bool IsFileHandleDisabled() const { return mFileHandleDisabled; }

  void NoteLiveMutableFile(IDBMutableFile* aMutableFile);

  void NoteFinishedMutableFile(IDBMutableFile* aMutableFile);

  already_AddRefed<DOMStringList> ObjectStoreNames() const;

  already_AddRefed<IDBObjectStore> CreateObjectStore(
      const nsAString& aName,
      const IDBObjectStoreParameters& aOptionalParameters, ErrorResult& aRv);

  void DeleteObjectStore(const nsAString& name, ErrorResult& aRv);

  // This will be called from the DOM.
  already_AddRefed<IDBTransaction> Transaction(
      JSContext* aCx, const StringOrStringSequence& aStoreNames,
      IDBTransactionMode aMode, ErrorResult& aRv);

  // This can be called from C++ to avoid JS exception.
  nsresult Transaction(JSContext* aCx,
                       const StringOrStringSequence& aStoreNames,
                       IDBTransactionMode aMode, IDBTransaction** aTransaction);

  StorageType Storage() const;

  IMPL_EVENT_HANDLER(abort)
  IMPL_EVENT_HANDLER(close)
  IMPL_EVENT_HANDLER(error)
  IMPL_EVENT_HANDLER(versionchange)

  already_AddRefed<IDBRequest> CreateMutableFile(
      JSContext* aCx, const nsAString& aName, const Optional<nsAString>& aType,
      ErrorResult& aRv);

  already_AddRefed<IDBRequest> MozCreateFileHandle(
      JSContext* aCx, const nsAString& aName, const Optional<nsAString>& aType,
      ErrorResult& aRv) {
    return CreateMutableFile(aCx, aName, aType, aRv);
  }

  void ClearBackgroundActor() {
    AssertIsOnOwningThread();

    // Decrease the number of active databases if it was not done in
    // CloseInternal().
    MaybeDecreaseActiveDatabaseCount();

    mBackgroundActor = nullptr;
  }

  const DatabaseSpec* Spec() const { return mSpec; }

  NS_DECL_ISUPPORTS_INHERITED
  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(IDBDatabase, DOMEventTargetHelper)

  // DOMEventTargetHelper
  void DisconnectFromOwner() override;

  virtual void LastRelease() override;

  virtual nsresult PostHandleEvent(EventChainPostVisitor& aVisitor) override;

  // nsWrapperCache
  virtual JSObject* WrapObject(JSContext* aCx,
                               JS::Handle<JSObject*> aGivenProto) override;

 private:
  IDBDatabase(IDBOpenDBRequest* aRequest, IDBFactory* aFactory,
              indexedDB::BackgroundDatabaseChild* aActor, DatabaseSpec* aSpec);

  ~IDBDatabase();

  void CloseInternal();

  void InvalidateInternal();

  bool RunningVersionChangeTransaction() const {
    AssertIsOnOwningThread();

    return !!mPreviousSpec;
  }

  void RefreshSpec(bool aMayDelete);

  void ExpireFileActors(bool aExpireAll);

  void InvalidateMutableFiles();

  void NoteInactiveTransactionDelayed();

  void LogWarning(const char* aMessageName, const nsAString& aFilename,
                  uint32_t aLineNumber, uint32_t aColumnNumber);

  // Only accessed by IDBObjectStore.
  nsresult RenameObjectStore(int64_t aObjectStoreId, const nsAString& aName);

  // Only accessed by IDBIndex.
  nsresult RenameIndex(int64_t aObjectStoreId, int64_t aIndexId,
                       const nsAString& aName);

  void IncreaseActiveDatabaseCount();

  void MaybeDecreaseActiveDatabaseCount();
};

}  // namespace dom
}  // namespace mozilla

#endif  // mozilla_dom_idbdatabase_h__