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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 _nsMsgDatabase_H_
#define _nsMsgDatabase_H_

#include "mozilla/Attributes.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/Path.h"
#include "nsIFile.h"
#include "nsIMsgDatabase.h"
#include "nsMsgHdr.h"
#include "nsString.h"
#include "nsAutoPtr.h"
#include "nsIDBChangeListener.h"
#include "nsIDBChangeAnnouncer.h"
#include "nsMsgMessageFlags.h"
#include "nsIMsgFolder.h"
#include "nsIMutableArray.h"
#include "nsDBFolderInfo.h"
#include "nsICollation.h"
#include "nsIMsgSearchSession.h"
#include "nsIMimeConverter.h"
#include "nsCOMPtr.h"
#include "nsCOMArray.h"
#include "PLDHashTable.h"
#include "nsTArray.h"
#include "nsTObserverArray.h"
#include "nsSimpleEnumerator.h"

class ListContext;
class nsMsgKeySet;
class nsMsgThread;
class nsMsgDatabase;
class nsIMsgThread;
class nsIDBFolderInfo;

const int32_t kMsgDBVersion = 1;

// Hopefully we're not opening up lots of databases at the same time, however
// this will give us a buffer before we need to start reallocating the cache
// array.
const uint32_t kInitialMsgDBCacheSize = 20;

class nsMsgDBService final : public nsIMsgDBService
{
public:
  NS_DECL_ISUPPORTS
  NS_DECL_NSIMSGDBSERVICE

  nsMsgDBService();

  void AddToCache(nsMsgDatabase* pMessageDB);
  void DumpCache();
  void EnsureCached(nsMsgDatabase* pMessageDB)
  {
    if (!m_dbCache.Contains(pMessageDB))
      m_dbCache.AppendElement(pMessageDB);
  }
  void RemoveFromCache(nsMsgDatabase* pMessageDB)
  {
    m_dbCache.RemoveElement(pMessageDB);
  }

protected:
  ~nsMsgDBService();
  void HookupPendingListeners(nsIMsgDatabase *db, nsIMsgFolder *folder);
  void FinishDBOpen(nsIMsgFolder *aFolder, nsMsgDatabase *aMsgDB);
  nsMsgDatabase* FindInCache(nsIFile *dbName);

  nsCOMArray <nsIMsgFolder> m_foldersPendingListeners;
  nsCOMArray <nsIDBChangeListener> m_pendingListeners;
  AutoTArray<nsMsgDatabase*, kInitialMsgDBCacheSize> m_dbCache;
};

class nsMsgDBEnumerator : public nsSimpleEnumerator {
public:
    const nsID& DefaultInterface() override
    {
      return NS_GET_IID(nsIMsgDBHdr);
    }

    // nsISimpleEnumerator methods:
    NS_DECL_NSISIMPLEENUMERATOR

    // nsMsgDBEnumerator methods:
    typedef nsresult (*nsMsgDBEnumeratorFilter)(nsIMsgDBHdr* hdr, void* closure);

    nsMsgDBEnumerator(nsMsgDatabase* db, nsIMdbTable *table,
                      nsMsgDBEnumeratorFilter filter, void* closure,
                      bool iterateForwards = true);
    void Clear();

    nsresult                        GetRowCursor();
    virtual nsresult                PrefetchNext();
    RefPtr<nsMsgDatabase>           mDB;
    nsCOMPtr<nsIMdbTableRowCursor>  mRowCursor;
    mdb_pos                         mRowPos;
    nsCOMPtr<nsIMsgDBHdr>           mResultHdr;
    bool                            mDone;
    bool                            mNextPrefetched;
    bool                            mIterateForwards;
    nsMsgDBEnumeratorFilter         mFilter;
    nsCOMPtr <nsIMdbTable>          mTable;
    void*                           mClosure;
    // This is used when the caller wants to limit how many headers the
    // enumerator looks at in any given time slice.
    mdb_pos                         mStopPos;

protected:
    ~nsMsgDBEnumerator() override;
};

class nsMsgFilteredDBEnumerator : public nsMsgDBEnumerator
{
public:
  nsMsgFilteredDBEnumerator(nsMsgDatabase* db, nsIMdbTable *table,
                            bool reverse, nsIArray *searchTerms);
  virtual ~nsMsgFilteredDBEnumerator();
  nsresult InitSearchSession(nsIArray *searchTerms, nsIMsgFolder *folder);

protected:
  virtual nsresult               PrefetchNext() override;

  nsCOMPtr <nsIMsgSearchSession> m_searchSession;

};

namespace mozilla {
namespace mailnews {
class MsgDBReporter;
}
}

class nsMsgDatabase : public nsIMsgDatabase
{
public:
  friend class nsMsgDBService;
  friend class nsMsgPropertyEnumerator; // accesses m_mdbEnv and m_mdbStore

  NS_DECL_ISUPPORTS
  NS_DECL_NSIDBCHANGEANNOUNCER
  NS_DECL_NSIMSGDATABASE

  /**
   * Opens a database folder.
   *
   * @param aFolderName     The name of the folder to create.
   * @param aCreate         Whether or not the file should be created.
   * @param aLeaveInvalidDB Set to true if you do not want the database to be
   *                        deleted if it is invalid.
   * @exception NS_ERROR_FILE_TARGET_DOES_NOT_EXIST
   *                        The file could not be created.
   * @exception NS_MSG_ERROR_FOLDER_SUMMARY_OUT_OF_DATE
   *                        The database is present (and was opened), but the
   *                        summary file is out of date.
   * @exception NS_MSG_ERROR_FOLDER_SUMMARY_MISSING
   *                        The database is present (and was opened), but the
   *                        summary file is missing.
   */
  virtual nsresult Open(nsMsgDBService *aDBService, nsIFile *aFolderName,
                        bool aCreate, bool aLeaveInvalidDB);
  virtual nsresult IsHeaderRead(nsIMsgDBHdr *hdr, bool *pRead);
  virtual nsresult MarkHdrReadInDB(nsIMsgDBHdr *msgHdr, bool bRead,
                               nsIDBChangeListener *instigator);
  nsresult OpenInternal(nsMsgDBService *aDBService, nsIFile *aFolderName,
                        bool aCreate, bool aLeaveInvalidDB, bool sync);
  nsresult CheckForErrors(nsresult err, bool sync, nsMsgDBService *aDBService, nsIFile *summaryFile);
  virtual nsresult OpenMDB(nsIFile *dbfile, bool create, bool sync);
  virtual nsresult CloseMDB(bool commit);
  virtual nsresult CreateMsgHdr(nsIMdbRow* hdrRow, nsMsgKey key, nsIMsgDBHdr **result);
  virtual nsresult GetThreadForMsgKey(nsMsgKey msgKey, nsIMsgThread **result);
  virtual nsresult EnumerateMessagesWithFlag(nsISimpleEnumerator* *result, uint32_t *pFlag);
  nsresult         GetSearchResultsTable(const char *searchFolderUri, bool createIfMissing, nsIMdbTable **table);

  // this might just be for debugging - we'll see.
  nsresult ListAllThreads(nsTArray<nsMsgKey> *threadIds);
  //////////////////////////////////////////////////////////////////////////////
  // nsMsgDatabase methods:
  nsMsgDatabase();

  void GetMDBFactory(nsIMdbFactory ** aMdbFactory);
  nsIMdbEnv             *GetEnv() {return m_mdbEnv;}
  nsIMdbStore           *GetStore() {return m_mdbStore;}
  virtual uint32_t      GetCurVersion();
  nsresult              GetCollationKeyGenerator();
  nsIMimeConverter *    GetMimeConverter();

  nsresult GetTableCreateIfMissing(const char *scope, const char *kind, nsIMdbTable **table,
                                   mdb_token &scopeToken, mdb_token &kindToken);

  //helper function to fill in nsStrings from hdr row cell contents.
  nsresult RowCellColumnTonsString(nsIMdbRow *row, mdb_token columnToken, nsAString &resultStr);
  nsresult RowCellColumnToUInt32(nsIMdbRow *row, mdb_token columnToken, uint32_t *uint32Result, uint32_t defaultValue = 0);
  nsresult RowCellColumnToUInt32(nsIMdbRow *row, mdb_token columnToken, uint32_t &uint32Result, uint32_t defaultValue = 0);
  nsresult RowCellColumnToUInt64(nsIMdbRow *row, mdb_token columnToken, uint64_t *uint64Result, uint64_t defaultValue = 0);
  nsresult RowCellColumnToMime2DecodedString(nsIMdbRow *row, mdb_token columnToken, nsAString &resultStr);
  nsresult RowCellColumnToCollationKey(nsIMdbRow *row, mdb_token columnToken, uint8_t **result, uint32_t *len);
  nsresult RowCellColumnToConstCharPtr(nsIMdbRow *row, mdb_token columnToken, const char **ptr);
  nsresult RowCellColumnToAddressCollationKey(nsIMdbRow *row, mdb_token colToken, uint8_t **result, uint32_t *len);

  nsresult GetEffectiveCharset(nsIMdbRow *row, nsACString &resultCharset);

  // these methods take the property name as a string, not a token.
  // they should be used when the properties aren't accessed a lot
  nsresult        GetProperty(nsIMdbRow *row, const char *propertyName, char **result);
  nsresult        SetProperty(nsIMdbRow *row, const char *propertyName, const char *propertyVal);
  nsresult        GetPropertyAsNSString(nsIMdbRow *row, const char *propertyName, nsAString &result);
  nsresult        SetPropertyFromNSString(nsIMdbRow *row, const char *propertyName, const nsAString &propertyVal);
  nsresult        GetUint32Property(nsIMdbRow *row, const char *propertyName, uint32_t *result, uint32_t defaultValue = 0);
  nsresult        GetUint64Property(nsIMdbRow *row, const char *propertyName, uint64_t *result, uint64_t defaultValue = 0);
  nsresult        SetUint32Property(nsIMdbRow *row, const char *propertyName, uint32_t propertyVal);
  nsresult        SetUint64Property(nsIMdbRow *row, const char *propertyName, uint64_t propertyVal);
  nsresult        GetBooleanProperty(nsIMdbRow *row, const char *propertyName,
                                     bool *result, bool defaultValue = false);
  nsresult        SetBooleanProperty(nsIMdbRow *row, const char *propertyName,
                                    bool propertyVal);
  // helper function for once we have the token.
  nsresult        SetNSStringPropertyWithToken(nsIMdbRow *row, mdb_token aProperty, const nsAString &propertyStr);

  // helper functions to put values in cells for the passed-in row
  nsresult        UInt32ToRowCellColumn(nsIMdbRow *row, mdb_token columnToken, uint32_t value);
  nsresult        CharPtrToRowCellColumn(nsIMdbRow *row, mdb_token columnToken, const char *charPtr);
  nsresult        RowCellColumnToCharPtr(nsIMdbRow *row, mdb_token columnToken, char **result);
  nsresult        UInt64ToRowCellColumn(nsIMdbRow *row, mdb_token columnToken, uint64_t value);

  // helper functions to copy an nsString to a yarn, int32 to yarn, and vice versa.
  static struct mdbYarn *nsStringToYarn(struct mdbYarn *yarn, const nsAString &str);
  static struct mdbYarn *UInt32ToYarn(struct mdbYarn *yarn, uint32_t i);
  static struct mdbYarn *UInt64ToYarn(struct mdbYarn *yarn, uint64_t i);
  static void YarnTonsString(struct mdbYarn *yarn, nsAString &str);
  static void YarnTonsCString(struct mdbYarn *yarn, nsACString &str);
  static void YarnToUInt32(struct mdbYarn *yarn, uint32_t *i);
  static void YarnToUInt64(struct mdbYarn *yarn, uint64_t *i);

#ifdef DEBUG
  virtual nsresult DumpContents();
  nsresult DumpThread(nsMsgKey threadId);
  nsresult DumpMsgChildren(nsIMsgDBHdr *msgHdr);
#endif

  friend class nsMsgHdr;  // use this to get access to cached tokens for hdr fields
  friend class nsMsgThread;  // use this to get access to cached tokens for hdr fields
  friend class nsMsgDBEnumerator;
  friend class nsMsgDBThreadEnumerator;
protected:
  virtual ~nsMsgDatabase();

  // prefs stuff - in future, we might want to cache the prefs interface
  nsresult        GetBoolPref(const char *prefName, bool *result);
  nsresult        GetIntPref(const char *prefName, int32_t *result);
  virtual void    GetGlobalPrefs();
    // retrieval methods
  nsIMsgThread *  GetThreadForReference(nsCString &msgID, nsIMsgDBHdr **pMsgHdr);
  nsIMsgThread *  GetThreadForSubject(nsCString &subject);
  nsIMsgThread *  GetThreadForMessageId(nsCString &msgId);
  nsIMsgThread *  GetThreadForThreadId(nsMsgKey threadId);
  nsMsgHdr     *  GetMsgHdrForReference(nsCString &reference);
  nsIMsgDBHdr  *  GetMsgHdrForSubject(nsCString &subject);
  // threading interfaces
  virtual nsresult CreateNewThread(nsMsgKey key, const char *subject, nsMsgThread **newThread);
  virtual bool    ThreadBySubjectWithoutRe();
  virtual bool    UseStrictThreading();
  virtual bool    UseCorrectThreading();
  virtual nsresult ThreadNewHdr(nsMsgHdr* hdr, bool &newThread);
  virtual nsresult AddNewThread(nsMsgHdr *msgHdr);
  virtual nsresult AddToThread(nsMsgHdr *newHdr, nsIMsgThread *thread, nsIMsgDBHdr *pMsgHdr, bool threadInThread);

  static PRTime gLastUseTime; // global last use time
  PRTime m_lastUseTime;       // last use time for this db
  // inline to make instrumentation as cheap as possible
  inline void RememberLastUseTime() {gLastUseTime = m_lastUseTime = PR_Now();}

  bool    MatchDbName(nsIFile *dbName);  // returns TRUE if they match

  // Flag handling routines
  virtual nsresult SetKeyFlag(nsMsgKey key, bool set, uint32_t flag,
                              nsIDBChangeListener *instigator = NULL);
  virtual nsresult SetMsgHdrFlag(nsIMsgDBHdr *msgHdr, bool set, uint32_t flag,
                                 nsIDBChangeListener *instigator);

  virtual bool    SetHdrFlag(nsIMsgDBHdr *, bool bSet, nsMsgMessageFlagType flag);
  virtual bool    SetHdrReadFlag(nsIMsgDBHdr *, bool pRead);
  virtual uint32_t GetStatusFlags(nsIMsgDBHdr *msgHdr, uint32_t origFlags);
  // helper function which doesn't involve thread object

  virtual nsresult RemoveHeaderFromDB(nsMsgHdr *msgHdr);
  virtual nsresult RemoveHeaderFromThread(nsMsgHdr *msgHdr);
  virtual nsresult AdjustExpungedBytesOnDelete(nsIMsgDBHdr *msgHdr);

  nsCOMPtr <nsICollation> m_collationKeyGenerator;
  nsCOMPtr <nsIMimeConverter> m_mimeConverter;
  nsCOMPtr <nsIMsgRetentionSettings> m_retentionSettings;
  nsCOMPtr <nsIMsgDownloadSettings> m_downloadSettings;

  nsresult PurgeMessagesOlderThan(uint32_t daysToKeepHdrs,
                                  bool applyToFlaggedMessages,
                                  nsIMutableArray *hdrsToDelete);
  nsresult PurgeExcessMessages(uint32_t numHeadersToKeep,
                               bool applyToFlaggedMessages,
                               nsIMutableArray *hdrsToDelete);

  // mdb bookkeeping stuff
  virtual nsresult      InitExistingDB();
  virtual nsresult      InitNewDB();
  virtual nsresult      InitMDBInfo();

  nsCOMPtr <nsIMsgFolder> m_folder;
  RefPtr<nsDBFolderInfo>  m_dbFolderInfo;
  nsMsgKey      m_nextPseudoMsgKey;
  nsIMdbEnv     *m_mdbEnv;  // to be used in all the db calls.
  nsIMdbStore   *m_mdbStore;
  nsIMdbTable   *m_mdbAllMsgHeadersTable;
  nsIMdbTable   *m_mdbAllThreadsTable;

  // Used for asynchronous db opens. If non-null, we're still opening
  // the underlying mork database. If null, the db has been completely opened.
  nsCOMPtr<nsIMdbThumb> m_thumb;
  // used to remember the args to Open for async open.
  bool m_create;
  bool m_leaveInvalidDB;

  nsCOMPtr<nsIFile> m_dbFile;
  nsTArray<nsMsgKey> m_newSet;  // new messages since last open.
  bool          m_mdbTokensInitialized;
  nsTObserverArray<nsCOMPtr<nsIDBChangeListener> > m_ChangeListeners;
  mdb_token     m_hdrRowScopeToken;
  mdb_token     m_threadRowScopeToken;
  mdb_token     m_hdrTableKindToken;
  mdb_token     m_threadTableKindToken;
  mdb_token     m_allThreadsTableKindToken;
  mdb_token     m_subjectColumnToken;
  mdb_token     m_senderColumnToken;
  mdb_token     m_messageIdColumnToken;
  mdb_token     m_referencesColumnToken;
  mdb_token     m_recipientsColumnToken;
  mdb_token     m_dateColumnToken;
  mdb_token     m_messageSizeColumnToken;
  mdb_token     m_flagsColumnToken;
  mdb_token     m_priorityColumnToken;
  mdb_token     m_labelColumnToken;
  mdb_token     m_statusOffsetColumnToken;
  mdb_token     m_numLinesColumnToken;
  mdb_token     m_ccListColumnToken;
  mdb_token     m_bccListColumnToken;
  mdb_token     m_threadFlagsColumnToken;
  mdb_token     m_threadIdColumnToken;
  mdb_token     m_threadChildrenColumnToken;
  mdb_token     m_threadUnreadChildrenColumnToken;
  mdb_token     m_messageThreadIdColumnToken;
  mdb_token     m_threadSubjectColumnToken;
  mdb_token     m_messageCharSetColumnToken;
  mdb_token     m_threadParentColumnToken;
  mdb_token     m_threadRootKeyColumnToken;
  mdb_token     m_threadNewestMsgDateColumnToken;
  mdb_token     m_offlineMsgOffsetColumnToken;
  mdb_token     m_offlineMessageSizeColumnToken;

  // header caching stuff - MRU headers, keeps them around in memory
  nsresult      AddHdrToCache(nsIMsgDBHdr *hdr, nsMsgKey key);
  nsresult      ClearHdrCache(bool reInit);
  nsresult      RemoveHdrFromCache(nsIMsgDBHdr *hdr, nsMsgKey key);
  // all headers currently instantiated, doesn't hold refs
  // these get added when msg hdrs get constructed, and removed when they get destroyed.
  nsresult      GetHdrFromUseCache(nsMsgKey key, nsIMsgDBHdr* *result);
  nsresult      AddHdrToUseCache(nsIMsgDBHdr *hdr, nsMsgKey key);
  nsresult      ClearUseHdrCache();
  nsresult      RemoveHdrFromUseCache(nsIMsgDBHdr *hdr, nsMsgKey key);

  // not-reference holding array of threads we've handed out.
  // If a db goes away, it will clean up the outstanding threads.
  // We use an nsTArray because we don't expect to ever have very many
  // of these, rarely more than 5.
  nsTArray<nsMsgThread *> m_threads;
  // Clear outstanding thread objects
  void ClearThreads();
  nsMsgThread *FindExistingThread(nsMsgKey threadId);

  mdb_pos       FindInsertIndexInSortedTable(nsIMdbTable *table, mdb_id idToInsert);

  void          ClearCachedObjects(bool dbGoingAway);
  void          ClearEnumerators();
  // all instantiated headers, but doesn't hold refs.
  PLDHashTable  *m_headersInUse;
  static PLDHashNumber HashKey(const void* aKey);
  static bool MatchEntry(const PLDHashEntryHdr* aEntry, const void* aKey);
  static void MoveEntry(PLDHashTable* aTable, const PLDHashEntryHdr* aFrom, PLDHashEntryHdr* aTo);
  static void ClearEntry(PLDHashTable* aTable, PLDHashEntryHdr* aEntry);
  static PLDHashTableOps gMsgDBHashTableOps;
  struct MsgHdrHashElement : public PLDHashEntryHdr {
    nsMsgKey       mKey;
    nsIMsgDBHdr     *mHdr;
  };
  PLDHashTable  *m_cachedHeaders;
  bool          m_bCacheHeaders;
  nsMsgKey  m_cachedThreadId;
  nsCOMPtr <nsIMsgThread> m_cachedThread;
  nsCOMPtr<nsIMdbFactory> mMdbFactory;

  // Message reference hash table
  static PLDHashTableOps gRefHashTableOps;
  struct RefHashElement : public PLDHashEntryHdr {
    const char     *mRef;       // Hash entry key, must come first
    nsMsgKey        mThreadId;
    uint32_t        mCount;
  };
  PLDHashTable *m_msgReferences;
  nsresult GetRefFromHash(nsCString &reference, nsMsgKey *threadId);
  nsresult AddRefToHash(nsCString &reference, nsMsgKey threadId);
  nsresult AddMsgRefsToHash(nsIMsgDBHdr *msgHdr);
  nsresult RemoveRefFromHash(nsCString &reference);
  nsresult RemoveMsgRefsFromHash(nsIMsgDBHdr *msgHdr);
  nsresult InitRefHash();

  // not-reference holding array of enumerators we've handed out.
  // If a db goes away, it will clean up the outstanding enumerators.
  nsTArray<nsMsgDBEnumerator *> m_enumerators;

  // Memory reporter details
public:
  static size_t HeaderHashSizeOf(PLDHashEntryHdr *hdr,
                                 mozilla::MallocSizeOf aMallocSizeOf,
                                 void *arg);
  virtual size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
  virtual size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
  {
    return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
  }
private:
  uint32_t m_cacheSize;
  RefPtr<mozilla::mailnews::MsgDBReporter> mMemReporter;
};

class nsMsgRetentionSettings : public nsIMsgRetentionSettings
{
public:
  nsMsgRetentionSettings();

  NS_DECL_ISUPPORTS
  NS_DECL_NSIMSGRETENTIONSETTINGS
protected:
  virtual ~nsMsgRetentionSettings();
  nsMsgRetainByPreference m_retainByPreference;
  uint32_t                m_daysToKeepHdrs;
  uint32_t                m_numHeadersToKeep;
  bool                    m_useServerDefaults;
  bool                    m_cleanupBodiesByDays;
  uint32_t                m_daysToKeepBodies;
  bool                    m_applyToFlaggedMessages;
};

class nsMsgDownloadSettings : public nsIMsgDownloadSettings
{
public:
  nsMsgDownloadSettings();

  NS_DECL_ISUPPORTS
  NS_DECL_NSIMSGDOWNLOADSETTINGS
protected:
  virtual ~nsMsgDownloadSettings();
  bool m_useServerDefaults;
  bool m_downloadUnreadOnly;
  bool m_downloadByDate;
  int32_t m_ageLimitOfMsgsToDownload;
};

#endif