using Pgno = System.UInt32;

namespace Community.CsharpSqlite
{
	public partial class Sqlite3
	{
		/*
		** 2001 September 15
		**
		** The author disclaims copyright to this source code.  In place of
		** a legal notice, here is a blessing:
		**
		**    May you do good and not evil.
		**    May you find forgiveness for yourself and forgive others.
		**    May you share freely, never taking more than you give.
		**
		*************************************************************************
		** This header file defines the interface that the sqlite page cache
		** subsystem.  The page cache subsystem reads and writes a file a page
		** at a time and provides a journal for rollback.
		*************************************************************************
		**  Included in SQLite3 port to C#-SQLite;  2008 Noah B Hart
		**  C#-SQLite is an independent reimplementation of the SQLite software library
		**
		**  SQLITE_SOURCE_ID: 2011-05-19 13:26:54 ed1da510a239ea767a01dc332b667119fa3c908e
		**
		*************************************************************************
		*/
		//#if !_PAGER_H_
		//#define _PAGER_H_

		/*
		** Default maximum size for persistent journal files. A negative
		** value means no limit. This value may be overridden using the
		** sqlite3PagerJournalSizeLimit() API. See also "PRAGMA journal_size_limit".
		*/
#if !SQLITE_DEFAULT_JOURNAL_SIZE_LIMIT
		private const int SQLITE_DEFAULT_JOURNAL_SIZE_LIMIT = -1;//#define SQLITE_DEFAULT_JOURNAL_SIZE_LIMIT -1
#endif

		/*
** The type used to represent a page number.  The first page in a file
** is called page 1.  0 is used to represent "not a page".
*/
		//typedef u32 Pgno;

		/*
		** Each open file is managed by a separate instance of the "Pager" structure.
		*/
		//typedef struct Pager Pager;

		/*
		** Handle type for pages.
		*/
		//typedef struct PgHdr DbPage;

		/*
		** Page number PAGER_MJ_PGNO is never used in an SQLite database (it is
		** reserved for working around a windows/posix incompatibility). It is
		** used in the journal to signify that the remainder of the journal file
		** is devoted to storing a master journal name - there are no more pages to
		** roll back. See comments for function writeMasterJournal() in pager.c
		** for details.
		*/

		//#define PAGER_MJ_PGNO(x) ((Pgno)((PENDING_BYTE/((x)->pageSize))+1))
		private static Pgno PAGER_MJ_PGNO(Pager x)
		{
			return ((Pgno)((PENDING_BYTE / ((x).pageSize)) + 1));
		}

		/*
		** Allowed values for the flags parameter to sqlite3PagerOpen().
		**
		** NOTE: These values must match the corresponding BTREE_ values in btree.h.
		*/

		//#define PAGER_OMIT_JOURNAL  0x0001    /* Do not use a rollback journal */
		//#define PAGER_NO_READLOCK   0x0002    /* Omit readlocks on readonly files */
		//#define PAGER_MEMORY        0x0004    /* In-memory database */
		private const int PAGER_OMIT_JOURNAL = 0x0001;

		private const int PAGER_NO_READLOCK = 0x0002;
		private const int PAGER_MEMORY = 0x0004;

		/*
		** Valid values for the second argument to sqlite3PagerLockingMode().
		*/

		//#define PAGER_LOCKINGMODE_QUERY      -1
		//#define PAGER_LOCKINGMODE_NORMAL      0
		//#define PAGER_LOCKINGMODE_EXCLUSIVE   1
		private static int PAGER_LOCKINGMODE_QUERY = -1;

		private static int PAGER_LOCKINGMODE_NORMAL = 0;
		private static int PAGER_LOCKINGMODE_EXCLUSIVE = 1;

		/*
		** Numeric constants that encode the journalmode.
		*/

		//#define PAGER_JOURNALMODE_QUERY     (-1)  /* Query the value of journalmode */
		//#define PAGER_JOURNALMODE_DELETE      0   /* Commit by deleting journal file */
		//#define PAGER_JOURNALMODE_PERSIST     1   /* Commit by zeroing journal header */
		//#define PAGER_JOURNALMODE_OFF         2   /* Journal omitted.  */
		//#define PAGER_JOURNALMODE_TRUNCATE    3   /* Commit by truncating journal */
		//#define PAGER_JOURNALMODE_MEMORY      4   /* In-memory journal file */
		//#define PAGER_JOURNALMODE_WAL         5   /* Use write-ahead logging */
		private const int PAGER_JOURNALMODE_QUERY = -1;

		private const int PAGER_JOURNALMODE_DELETE = 0;
		private const int PAGER_JOURNALMODE_PERSIST = 1;
		private const int PAGER_JOURNALMODE_OFF = 2;
		private const int PAGER_JOURNALMODE_TRUNCATE = 3;
		private const int PAGER_JOURNALMODE_MEMORY = 4;
		private const int PAGER_JOURNALMODE_WAL = 5;

		/*
		** The remainder of this file contains the declarations of the functions
		** that make up the Pager sub-system API. See source code comments for
		** a detailed description of each routine.
		*/
		/* Open and close a Pager connection. */
		//int sqlite3PagerOpen(
		//  sqlite3_vfs*,
		//  Pager **ppPager,
		//  const char*,
		//  int,
		//  int,
		//  int,
		////  void()(DbPage)
		//);
		//int sqlite3PagerClose(Pager *pPager);
		//int sqlite3PagerReadFileheader(Pager*, int, unsigned char);

		/* Functions used to configure a Pager object. */
		//void sqlite3PagerSetBusyhandler(Pager*, int()(void ), object  );
		//int sqlite3PagerSetPagesize(Pager*, u32*, int);
		//int sqlite3PagerMaxPageCount(Pager*, int);
		//void sqlite3PagerSetCachesize(Pager*, int);
		//void sqlite3PagerSetSafetyLevel(Pager*,int,int,int);
		//int sqlite3PagerLockingMode(Pager *, int);
		//int sqlite3PagerSetJournalMode(Pager *, int);
		//int sqlite3PagerGetJournalMode(Pager);
		//int sqlite3PagerOkToChangeJournalMode(Pager);
		//i64 sqlite3PagerJournalSizeLimit(Pager *, i64);
		//sqlite3_backup **sqlite3PagerBackupPtr(Pager);

		/* Functions used to obtain and release page references. */
		//int sqlite3PagerAcquire(Pager *pPager, Pgno pgno, DbPage **ppPage, int clrFlag);
		//#define sqlite3PagerGet(A,B,C) sqlite3PagerAcquire(A,B,C,0)
		//DbPage *sqlite3PagerLookup(Pager *pPager, Pgno pgno);
		//void sqlite3PagerRef(DbPage);
		//void sqlite3PagerUnref(DbPage);

		/* Operations on page references. */
		//int sqlite3PagerWrite(DbPage);
		//void sqlite3PagerDontWrite(DbPage);
		//int sqlite3PagerMovepage(Pager*,DbPage*,Pgno,int);
		//int sqlite3PagerPageRefcount(DbPage);
		//void *sqlite3PagerGetData(DbPage );
		//void *sqlite3PagerGetExtra(DbPage );

		/* Functions used to manage pager transactions and savepoints. */
		//void sqlite3PagerPagecount(Pager*, int);
		//int sqlite3PagerBegin(Pager*, int exFlag, int);
		//int sqlite3PagerCommitPhaseOne(Pager*,string zMaster, int);
		//int sqlite3PagerExclusiveLock(Pager);
		//int sqlite3PagerSync(Pager *pPager);
		//int sqlite3PagerCommitPhaseTwo(Pager);
		//int sqlite3PagerRollback(Pager);
		//int sqlite3PagerOpenSavepoint(Pager *pPager, int n);
		//int sqlite3PagerSavepoint(Pager *pPager, int op, int iSavepoint);
		//int sqlite3PagerSharedLock(Pager *pPager);

		//int sqlite3PagerCheckpoint(Pager *pPager, int, int*, int);
		//int sqlite3PagerWalSupported(Pager* pPager);
		//int sqlite3PagerWalCallback(Pager* pPager);
		//int sqlite3PagerOpenWal(Pager* pPager, int* pisOpen);
		//int sqlite3PagerCloseWal(Pager* pPager);

		/* Functions used to query pager state and configuration. */
		//u8 sqlite3PagerIsreadonly(Pager);
		//int sqlite3PagerRefcount(Pager);
		//int sqlite3PagerMemUsed(Pager);
		//string sqlite3PagerFilename(Pager);
		//const sqlite3_vfs *sqlite3PagerVfs(Pager);
		//sqlite3_file *sqlite3PagerFile(Pager);
		//string sqlite3PagerJournalname(Pager);
		//int sqlite3PagerNosync(Pager);
		//void *sqlite3PagerTempSpace(Pager);
		//int sqlite3PagerIsMemdb(Pager);

		/* Functions used to truncate the database file. */
		//void sqlite3PagerTruncateImage(Pager*,Pgno);

		//#if (SQLITE_HAS_CODEC) && !defined(SQLITE_OMIT_WAL)
		//void *sqlite3PagerCodec(DbPage );
		//#endif

		/* Functions to support testing and debugging. */
		//#if !NDEBUG || SQLITE_TEST
		//  Pgno sqlite3PagerPagenumber(DbPage);
		//  int sqlite3PagerIswriteable(DbPage);
		//#endif
		//#if SQLITE_TEST
		//  int *sqlite3PagerStats(Pager);
		//  void sqlite3PagerRefdump(Pager);
		//  void disable_simulated_io_errors(void);
		//  void enable_simulated_io_errors(void);
		//#else
		//# define disable_simulated_io_errors()
		//# define enable_simulated_io_errors()
		//#endif
	}
}