/*

Miranda NG: the free IM client for Microsoft* Windows*

Copyright 2012 Miranda NG project,
all portions of this codebase are copyrighted to the people
listed in contributors.txt.

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/

#ifndef M_DB_INT_H__
#define M_DB_INT_H__ 1

#ifndef M_CORE_H__
	#include <m_core.h>
#endif

///////////////////////////////////////////////////////////////////////////////
// basic database interface

struct DBCachedGlobalValue
{
	char* name;
	DBVARIANT value;
};

struct DBCachedContactValue
{
	char* name;
	DBVARIANT value;
	DBCachedContactValue* next;
};

struct DBCachedContact
{
	HANDLE hContact;
	HANDLE hNext;
	char  *szProto;
	DBCachedContactValue* first;
	DBCachedContactValue* last;
};

interface MIDatabaseCache
{
	STDMETHOD_(DBCachedContact*,AddContactToCache)(HANDLE hContact) PURE;
	STDMETHOD_(DBCachedContact*,GetCachedContact)(HANDLE hContact) PURE;
	STDMETHOD_(void,FreeCachedContact)(HANDLE hContact) PURE;

	STDMETHOD_(char*,InsertCachedSetting)(const char *szName, int) PURE;
	STDMETHOD_(char*,GetCachedSetting)(const char *szModuleName, const char *szSettingName, int, int) PURE;
	STDMETHOD_(void,SetCachedVariant)(DBVARIANT *s, DBVARIANT *d) PURE;
	STDMETHOD_(DBVARIANT*,GetCachedValuePtr)(HANDLE hContact, char *szSetting, int bAllocate) PURE;
};

interface MIDatabase
{
	MIDatabaseCache* m_cache;

	STDMETHOD_(void,SetCacheSafetyMode)(BOOL) PURE;

	STDMETHOD_(LONG,GetContactCount)(void) PURE;
	STDMETHOD_(HANDLE,FindFirstContact)(const char* szProto = NULL) PURE;
	STDMETHOD_(HANDLE,FindNextContact)(HANDLE hContact, const char* szProto = NULL) PURE;

	STDMETHOD_(LONG,DeleteContact)(HANDLE hContact) PURE;
	STDMETHOD_(HANDLE,AddContact)(void) PURE;
	STDMETHOD_(BOOL,IsDbContact)(HANDLE hContact) PURE;

	STDMETHOD_(LONG,GetEventCount)(HANDLE hContact) PURE;
	STDMETHOD_(HANDLE,AddEvent)(HANDLE hContact, DBEVENTINFO *dbe) PURE;
	STDMETHOD_(BOOL,DeleteEvent)(HANDLE hContact, HANDLE hDbEvent) PURE;
	STDMETHOD_(LONG,GetBlobSize)(HANDLE hDbEvent) PURE;
	STDMETHOD_(BOOL,GetEvent)(HANDLE hDbEvent, DBEVENTINFO *dbe) PURE;
	STDMETHOD_(BOOL,MarkEventRead)(HANDLE hContact, HANDLE hDbEvent) PURE;
	STDMETHOD_(HANDLE,GetEventContact)(HANDLE hDbEvent) PURE;
	STDMETHOD_(HANDLE,FindFirstEvent)(HANDLE hContact) PURE;
	STDMETHOD_(HANDLE,FindFirstUnreadEvent)(HANDLE hContact) PURE;
	STDMETHOD_(HANDLE,FindLastEvent)(HANDLE hContact) PURE;
	STDMETHOD_(HANDLE,FindNextEvent)(HANDLE hDbEvent) PURE;
	STDMETHOD_(HANDLE,FindPrevEvent)(HANDLE hDbEvent) PURE;

	STDMETHOD_(BOOL,EnumModuleNames)(DBMODULEENUMPROC pFunc, void *pParam) PURE;

	STDMETHOD_(BOOL,GetContactSetting)(HANDLE hContact, DBCONTACTGETSETTING *dbcgs) PURE;
	STDMETHOD_(BOOL,GetContactSettingStr)(HANDLE hContact, DBCONTACTGETSETTING *dbcgs) PURE;
	STDMETHOD_(BOOL,GetContactSettingStatic)(HANDLE hContact, DBCONTACTGETSETTING *dbcgs) PURE;
	STDMETHOD_(BOOL,FreeVariant)(DBVARIANT *dbv) PURE;
	STDMETHOD_(BOOL,WriteContactSetting)(HANDLE hContact, DBCONTACTWRITESETTING *dbcws) PURE;
	STDMETHOD_(BOOL,DeleteContactSetting)(HANDLE hContact, DBCONTACTGETSETTING *dbcgs) PURE;
	STDMETHOD_(BOOL,EnumContactSettings)(HANDLE hContact, DBCONTACTENUMSETTINGS* dbces) PURE;
	STDMETHOD_(BOOL,SetSettingResident)(BOOL bIsResident, const char *pszSettingName) PURE;
	STDMETHOD_(BOOL,EnumResidentSettings)(DBMODULEENUMPROC pFunc, void *pParam) PURE;
};

///////////////////////////////////////////////////////////////////////////////
// basic database checker interface

#define STATUS_MESSAGE    0
#define STATUS_WARNING    1
#define STATUS_ERROR      2
#define STATUS_FATAL      3
#define STATUS_SUCCESS    4

struct DBCHeckCallback
{
	int    cbSize;
	DWORD  spaceProcessed, spaceUsed;
	HANDLE hOutFile;
	int    bCheckOnly, bBackup, bAggressive, bEraseHistory, bMarkRead, bConvertUtf;

	void (*pfnAddLogMessage)(int type, const TCHAR* ptszFormat, ...);
};

interface MIDatabaseChecker
{
	STDMETHOD_(BOOL,Start)(DBCHeckCallback *callback) PURE;
	STDMETHOD_(BOOL,CheckDb)(int phase, int firstTime) PURE;
	STDMETHOD_(VOID,Destroy)() PURE;
};

///////////////////////////////////////////////////////////////////////////////
// Each database plugin should register itself using this structure

/*
 Codes for DATABASELINK functions
*/

// grokHeader() error codes
#define EGROKPRF_NOERROR	0
#define EGROKPRF_CANTREAD	1	// can't open the profile for reading
#define EGROKPRF_UNKHEADER  2	// header not supported, not a supported profile
#define EGROKPRF_VERNEWER   3	// header correct, version in profile newer than reader/writer
#define EGROKPRF_DAMAGED	4	// header/version fine, other internal data missing, damaged.

// makeDatabase() error codes
#define EMKPRF_CREATEFAILED 1   // for some reason CreateFile() didnt like something

struct DATABASELINK
{
	int cbSize;
	char* szShortName;  // uniqie short database name
	TCHAR* szFullName;  // in English, auto-translated by the core

	/*
		profile: pointer to a string which contains full path + name
		Affect: The database plugin should create the profile, the filepath will not exist at
			the time of this call, profile will be C:\..\<name>.dat
		Returns: 0 on success, non zero on failure - error contains extended error information, see EMKPRF_*
	*/
	int (*makeDatabase)(const TCHAR *profile);

	/*
		profile: [in] a null terminated string to file path of selected profile
		error: [in/out] pointer to an int to set with error if any
		Affect: Ask the database plugin if it supports the given profile, if it does it will
			return 0, if it doesnt return 1, with the error set in error -- EGROKPRF_* can be valid error
			condition, most common error would be [EGROKPRF_UNKHEADER]
		Note: Just because 1 is returned, doesnt mean the profile is not supported, the profile might be damaged
			etc.
		Returns: 0 on success, non zero on failure
	*/
	int (*grokHeader)(const TCHAR *profile);

	/*
	Affect: Tell the database to create all services/hooks that a 3.xx legacy database might support into link,
		which is a PLUGINLINK structure
	Returns: 0 on success, nonzero on failure
	*/
	MIDatabase* (*Load) (const TCHAR *profile);

	/*
	Affect: The database plugin should shutdown, unloading things from the core and freeing internal structures
	Returns: 0 on success, nonzero on failure
	Note: Unload() might be called even if Load(void) was never called, wasLoaded is set to 1 if Load(void) was ever called.
	*/
	int (*Unload)(MIDatabase*);

	/*
	Returns a pointer to the database checker or NULL if a database doesn't support checking
	When you don't need this object aanymore,  call its Destroy() method
	*/
	MIDatabaseChecker* (*CheckDB) (const TCHAR *profile, int *error);
};

///////////////////////////////////////////////////////////////////////////////
// Database list's services

// MS_DB_REGISTER_PLUGIN : registers a database plugin
// wParam : 0 (unused)
// lParam : DATABASELINK* = database link description

#define MS_DB_REGISTER_PLUGIN "DB/RegisterPlugin"

__forceinline void RegisterDatabasePlugin(DATABASELINK* pDescr)
{	CallService(MS_DB_REGISTER_PLUGIN, 0, (LPARAM)pDescr);
}

// MS_DB_FIND_PLUGIN : looks for a database plugin suitable to open this file
// wParam : 0 (unused)
// lParam : const TCHAR* = name of the database file
// returns DATABASELINK* of the required plugin or NULL on error

#define MS_DB_FIND_PLUGIN "DB/FindPlugin"

__forceinline DATABASELINK* FindDatabasePlugin(const TCHAR* ptszFileName)
{	return (DATABASELINK*)CallService(MS_DB_FIND_PLUGIN, 0, (LPARAM)ptszFileName);
}

// MS_DB_GET_CURRENT : returns the database pointer for the current profile
// wParam : 0 (unused)
// lParam : 0 (unused)
// returns MIDatabase* of the current profile or NULL on error

#define MS_DB_GET_CURRENT "DB/GetCurrentDb"

__forceinline MIDatabase* GetCurrentDatabase(void)
{	return (MIDatabase*)CallService(MS_DB_GET_CURRENT, 0, 0);
}

// MS_DB_INIT_INSTANCE : initializes a database instance
// wParam : 0 (unused)
// lParam : MIDatabase* = pointer to a database instance
// returns 0

#define MS_DB_INIT_INSTANCE "DB/InitDbInstance"

__forceinline void InitDbInstance(MIDatabase* pDatabase)
{	CallService(MS_DB_INIT_INSTANCE, 0, (LPARAM)pDatabase);
}

// MS_DB_DESTROY_INSTANCE : destroys a database instance
// wParam : 0 (unused)
// lParam : MIDatabase* = pointer to a database instance
// returns 0

#define MS_DB_DESTROY_INSTANCE "DB/DestroyDbInstance"

__forceinline void DestroyDbInstance(MIDatabase* pDatabase)
{	CallService(MS_DB_DESTROY_INSTANCE, 0, (LPARAM)pDatabase);
}

#endif // M_DB_INT_H__