/*
    Variables Plugin for Miranda-IM (www.miranda-im.org)
    Copyright 2003-2006 P. Boon

    This program is mir_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
*/

#include "variables.h"

struct _tagType
{
	int    cnfCode;
	TCHAR* str;
}
static builtinCnfs[] =
{
	{ CNF_FIRSTNAME,   _T(STR_FIRSTNAME)  }, 
	{ CNF_LASTNAME,    _T(STR_LASTNAME)   },
	{ CNF_NICK,        _T(STR_NICK)       },
	{ CNF_CUSTOMNICK,  _T(STR_CUSTOMNICK) },
	{ CNF_EMAIL,       _T(STR_EMAIL)      },
	{ CNF_CITY,        _T(STR_CITY)       },
	{ CNF_STATE,       _T(STR_STATE)      },
	{ CNF_COUNTRY,     _T(STR_COUNTRY)    },
	{ CNF_PHONE,       _T(STR_PHONE)      },
	{ CNF_HOMEPAGE,    _T(STR_HOMEPAGE)   },
	{ CNF_ABOUT,       _T(STR_ABOUT)      },
	{ CNF_GENDER,      _T(STR_GENDER)     },
	{ CNF_AGE,         _T(STR_AGE)        },
	{ CNF_FIRSTLAST,   _T(STR_FIRSTLAST)  },
	{ CNF_UNIQUEID,    _T(STR_UNIQUEID)   },
	{ CNF_DISPLAY,     _T(STR_DISPLAY)    },
	{ CNF_FAX,         _T(STR_FAX)        },
	{ CNF_CELLULAR,    _T(STR_CELLULAR)   },
	{ CNF_TIMEZONE,    _T(STR_TIMEZONE)   },
	{ CNF_MYNOTES,     _T(STR_MYNOTES)    },
	{ CNF_BIRTHDAY,    _T(STR_BIRTHDAY)   },
	{ CNF_BIRTHMONTH,  _T(STR_BIRTHMONTH) },
	{ CNF_BIRTHYEAR,   _T(STR_BIRTHYEAR)  },
	{ CNF_STREET,      _T(STR_STREET)     },
	{ CNF_ZIP,         _T(STR_ZIP)        },
	{ CNF_LANGUAGE1,   _T(STR_LANGUAGE1)  },
	{ CNF_LANGUAGE2,   _T(STR_LANGUAGE2)  },
	{ CNF_LANGUAGE3,   _T(STR_LANGUAGE3)  },
	{ CNF_CONAME,      _T(STR_CONAME)     },
	{ CNF_CODEPT,      _T(STR_CODEPT)     },
	{ CNF_COPOSITION,  _T(STR_COPOSITION) },
	{ CNF_COSTREET,    _T(STR_COSTREET)   },
	{ CNF_COCITY,      _T(STR_COCITY)     },
	{ CNF_COSTATE,     _T(STR_COSTATE)    },
	{ CNF_COZIP,       _T(STR_COZIP)      },
	{ CNF_COCOUNTRY,   _T(STR_COCOUNTRY)  },
	{ CNF_COHOMEPAGE,  _T(STR_COHOMEPAGE) },

	{ CCNF_ACCOUNT,    _T(STR_ACCOUNT)    },
	{ CCNF_PROTOCOL,   _T(STR_PROTOCOL)   },
	{ CCNF_STATUS,     _T(STR_STATUS)     },
	{ CCNF_INTERNALIP, _T(STR_INTERNALIP) },
	{ CCNF_EXTERNALIP, _T(STR_EXTERNALIP) },
	{ CCNF_GROUP,      _T(STR_GROUP)      },
	{ CCNF_PROTOID,    _T(STR_PROTOID)    }
};

typedef struct {
	TCHAR* tszContact;
	HANDLE hContact;
	DWORD flags;
} CONTACTCE; /* contact cache entry */

/* cache for 'getcontactfromstring' service */
static CONTACTCE *cce = NULL;
static int cacheSize = 0;
static CRITICAL_SECTION csContactCache;

static HANDLE hContactSettingChangedHook;
static HANDLE hGetContactFromStringService;

/*
	converts a string into a CNF_ type
*/
BYTE getContactInfoType(TCHAR* type) {

	int i;

	if (type == NULL || _tcslen(type) == 0 )
		return 0;

	for ( i=0; i < SIZEOF(builtinCnfs); i++ )
		if (!_tcscmp( builtinCnfs[i].str, type ))
			return builtinCnfs[i].cnfCode;

	return 0;
}

/*
	returns info about a contact as a string
*/
TCHAR* getContactInfoT(BYTE type, HANDLE hContact)
{
	/* returns dynamic allocated buffer with info, or NULL if failed */
	CONTACTINFO ci;
	TCHAR *res = NULL, *szStatus;
	char *szProto, protoname[128], szVal[16];
	DBVARIANT dbv;

	if (hContact == NULL)
		return NULL;

	szProto = GetContactProto(hContact);
	if (szProto == NULL)
		return NULL;

	switch (type)
	{
		case CCNF_PROTOID:
			return (TCHAR*)mir_a2t(szProto);

		case CCNF_ACCOUNT:
			if (g_mirandaVersion < PLUGIN_MAKE_VERSION( 0,8,0,0 ))
				return NULL;
			{
				PROTOACCOUNT* pa = ProtoGetAccount(szProto);
				return pa ? mir_tstrdup(pa->tszAccountName) : NULL;
			}

		case CCNF_PROTOCOL:
			if (CallProtoService(szProto, PS_GETNAME, (WPARAM)sizeof(protoname), (LPARAM)protoname))
				return NULL;
			return (TCHAR*)mir_a2t(protoname);

		case CCNF_STATUS:
			szStatus = (TCHAR*)CallService(
					MS_CLIST_GETSTATUSMODEDESCRIPTION,
					(WPARAM)db_get_w(hContact, szProto, "Status", ID_STATUS_OFFLINE),
					(LPARAM)GSMDF_UNICODE);
			if (szStatus == NULL)
				return NULL;
			return mir_tstrdup(szStatus);

		case CCNF_INTERNALIP:
		case CCNF_EXTERNALIP:
			{
				DWORD ip = db_get_dw(hContact, szProto, (type == CCNF_INTERNALIP) ? "RealIP" : "IP", 0);
				if (ip == 0)
					return NULL;

				struct in_addr in;
				in.s_addr = htonl(ip);
				char* dotted = inet_ntoa(in);
				if (dotted == NULL)
					return NULL;
				return (TCHAR*)mir_a2t(dotted);
			}

		case CCNF_GROUP:
			if (!db_get_ts(hContact, "CList", "Group", &dbv))
			{
				res = (TCHAR*)mir_wstrdup(dbv.pwszVal);
				db_free(&dbv);
				return res;
			}
			break;

		case CNF_UNIQUEID:
			//UID for ChatRoom
			if (db_get_b(hContact, szProto, "ChatRoom", 0) == 1)
			{
				DBVARIANT dbv;
				if (!db_get_ts(hContact, szProto, "ChatRoomID", &dbv ))
				{
					res = mir_tstrdup( dbv.ptszVal );
					db_free( &dbv );
					return res;

				}
			}

			//UID for other contact
			break;
	}

	ZeroMemory(&ci,sizeof(CONTACTINFO));
	ci.cbSize = sizeof(CONTACTINFO);
	ci.hContact = hContact;
	ci.dwFlag = type | CNF_UNICODE;
	CallService(MS_CONTACT_GETCONTACTINFO, 0, (LPARAM)&ci);

	memset(szVal, '\0', sizeof(szVal));
	switch(ci.type)
	{
		case CNFT_BYTE:
			if (type != CNF_GENDER)
				return itot(ci.bVal);

			szVal[0] = (char)ci.bVal;
			return (TCHAR*)mir_a2t(szVal);

		case CNFT_WORD:
			return itot(ci.wVal);

		case CNFT_DWORD:
			return itot(ci.dVal);

		case CNFT_ASCIIZ:
			if (ci.pszVal != NULL)
			{
				res = mir_tstrdup(ci.pszVal);
				mir_free(ci.pszVal);
			}
			break;
	}

	return res;
}

/*
	MS_VARS_GETCONTACTFROMSTRING
*/
int getContactFromString( CONTACTSINFO* ci )
{
	/* service to retrieve a contact's HANDLE from a given string */
	char *szProto;
	TCHAR *szFind, *cInfo, *tszContact, *tszProto;
	BOOL bMatch;
	DBVARIANT dbv;
	HANDLE hContact;
	int count, i;

	if (ci == NULL)
		return -1;

	if (ci->flags & CI_UNICODE)
		tszContact = NEWTSTR_ALLOCA(ci->tszContact);
	else {
		WCHAR* tmp = mir_a2t(ci->szContact);
		tszContact = NEWTSTR_ALLOCA(tmp);
		mir_free(tmp);
	}
	if ((tszContact == NULL) || (_tcslen(tszContact) == 0))
		return -1;

	ci->hContacts = NULL;
	count = 0;
	/* search the cache */
	EnterCriticalSection(&csContactCache);
	for (i=0;i<cacheSize;i++) {
		if ((!_tcscmp(cce[i].tszContact, tszContact)) && (ci->flags == cce[i].flags)) {
			/* found in cache */
			ci->hContacts = ( HANDLE* )mir_alloc(sizeof(HANDLE));
			if (ci->hContacts == NULL) {
				LeaveCriticalSection(&csContactCache);
				return -1;
			}
			ci->hContacts[0] = cce[i].hContact;
			LeaveCriticalSection(&csContactCache);
			return 1;
		}
	}

	LeaveCriticalSection(&csContactCache);
	/* contact was not in cache, do a search */
	for (HANDLE hContact = db_find_first(); hContact; hContact = db_find_next(hContact)) {
		szFind = NULL;
		bMatch = FALSE;
		ZeroMemory(&dbv, sizeof(DBVARIANT));
		szProto = GetContactProto(hContact);
		if (szProto == NULL)
			continue;

		// <proto:id> (exact)
		if (ci->flags & CI_PROTOID) {
			cInfo = getContactInfoT(CNF_UNIQUEID, hContact);
			if (cInfo == NULL) {
				// <HANDLE:hContact>
				cInfo = (TCHAR*)mir_alloc(32);
				_stprintf(cInfo, _T("%p"), hContact);
				szFind = (TCHAR*)mir_alloc((_tcslen(cInfo) + _tcslen(_T(PROTOID_HANDLE)) + 4)*sizeof(TCHAR));
				if (szFind != NULL)
				{
					wsprintf(szFind, _T("<%s:%s>"), _T(PROTOID_HANDLE), cInfo);
					if (!_tcsncmp(tszContact, szFind, _tcslen(tszContact)))
						bMatch = TRUE;

					mir_free(cInfo);
					mir_free(szFind);
				}
			}
			else {
				szFind = (TCHAR*)mir_alloc((_tcslen(cInfo) + strlen(szProto) + 4)*sizeof(TCHAR));
				if (szFind != NULL) {
					tszProto = mir_a2t(szProto);
					if ((tszProto != NULL) && (szFind != NULL)) {
						wsprintf(szFind, _T("<%s:%s>"), tszProto, cInfo);
						mir_free(cInfo);
						mir_free(tszProto);
						if (!_tcsncmp(tszContact, szFind, _tcslen(tszContact)))
							bMatch = TRUE;

						mir_free(szFind);
					}
				}
			}
		}
		// id (exact)
		if ((ci->flags&CI_UNIQUEID) && (!bMatch)) {
			szFind = getContactInfoT(CNF_UNIQUEID, hContact);
			if (szFind != NULL) {
				if (!_tcscmp(tszContact, szFind))
					bMatch = TRUE;

				mir_free(szFind);
			}
		}
		// nick (not exact)
		if ((ci->flags&CI_NICK) && (!bMatch)) {
			szFind = getContactInfoT(CNF_NICK, hContact);
			if (szFind != NULL) {
				if (!_tcscmp(tszContact, szFind))
					bMatch = TRUE;

				mir_free(szFind);
			}
		}
		// list name (not exact)
		if ((ci->flags&CI_LISTNAME) && (!bMatch)) {
			szFind = getContactInfoT(CNF_DISPLAY, hContact);
			if (szFind != NULL) {
				if (!_tcscmp(tszContact, szFind))
					bMatch = TRUE;

				mir_free(szFind);
			}
		}
		// firstname (exact)
		if ((ci->flags&CI_FIRSTNAME) && (!bMatch)) {
			szFind = getContactInfoT(CNF_FIRSTNAME, hContact);
			if (szFind != NULL) {
				if (!_tcscmp(tszContact, szFind)) {
					bMatch = TRUE;
				}
				mir_free(szFind);
			}
		}
		// lastname (exact)
		if ((ci->flags&CI_LASTNAME) && (!bMatch)) {
			szFind = getContactInfoT(CNF_LASTNAME, hContact);
			if (szFind != NULL) {
				if (!_tcscmp(tszContact, szFind)) {
					bMatch = TRUE;
				}
				mir_free(szFind);
			}
		}
		// email (exact)
		if ((ci->flags&CI_EMAIL) && (!bMatch)) {
			szFind = getContactInfoT(CNF_EMAIL, hContact);
			if (szFind != NULL) {
				if (!_tcscmp(tszContact, szFind)) {
					bMatch = TRUE;
				}
				mir_free(szFind);
			}
		}
		// CNF_ (exact)
		if ((ci->flags&CI_CNFINFO) && (!bMatch)) {
			szFind = getContactInfoT((BYTE)(ci->flags&~(CI_CNFINFO|CI_TCHAR)), hContact);
			if (szFind != NULL) {
				if (!_tcscmp(tszContact, szFind)) {
					bMatch = TRUE;
				}
				mir_free(szFind);
			}
		}
		if (bMatch) {
			ci->hContacts = ( HANDLE* )mir_realloc(ci->hContacts, (count+1)*sizeof(HANDLE));
			if (ci->hContacts == NULL) {

				return -1;
			}
			ci->hContacts[count] = hContact;
			count += 1;
		}
	}

	if (count == 1) { /* cache the found result */
		EnterCriticalSection(&csContactCache);
		cce = ( CONTACTCE* )mir_realloc(cce, (cacheSize+1)*sizeof(CONTACTCE));
		if (cce == NULL) {
			LeaveCriticalSection(&csContactCache);
			return count;
		}

		cce[cacheSize].hContact = ci->hContacts[0];
		cce[cacheSize].flags = ci->flags;
		cce[cacheSize].tszContact = mir_tstrdup(tszContact);
		if (cce[cacheSize].tszContact != NULL)
			cacheSize += 1;

		LeaveCriticalSection(&csContactCache);
	}

	return count;
}

/* keep cache consistent */
static int contactSettingChanged(WPARAM wParam, LPARAM lParam)
{
	DBCONTACTWRITESETTING *dbw = (DBCONTACTWRITESETTING*)lParam;
	HANDLE hContact = (HANDLE) wParam;
	EnterCriticalSection(&csContactCache);
	for (int i=0;i<cacheSize;i++) {
		if (hContact != cce[i].hContact && (cce[i].flags & CI_CNFINFO) == 0 )
			continue;

		char *szProto = GetContactProto(hContact);
		if (szProto == NULL)
			continue;

		char *uid = (char*)CallProtoService(szProto,PS_GETCAPS,PFLAG_UNIQUEIDSETTING,0);
		if (((!strcmp(dbw->szSetting, "Nick")) && (cce[i].flags&CI_NICK)) ||
			 ((!strcmp(dbw->szSetting, "FirstName")) && (cce[i].flags&CI_FIRSTNAME)) ||
			 ((!strcmp(dbw->szSetting, "LastName")) && (cce[i].flags&CI_LASTNAME)) ||
			 ((!strcmp(dbw->szSetting, "e-mail")) && (cce[i].flags&CI_EMAIL)) ||
			 ((!strcmp(dbw->szSetting, "MyHandle")) && (cce[i].flags&CI_LISTNAME)) ||
			 (cce[i].flags & CI_CNFINFO) != 0 || // lazy; always invalidate CNF info cache entries
			 (( ((INT_PTR)uid != CALLSERVICE_NOTFOUND) && (uid != NULL)) && (!strcmp(dbw->szSetting, uid)) && (cce[i].flags & CI_UNIQUEID)))
		{
			/* remove from cache */
			mir_free(cce[i].tszContact);
			if (cacheSize > 1) {
				MoveMemory(&cce[i], &cce[cacheSize-1], sizeof(CONTACTCE));
				cce = ( CONTACTCE* )mir_realloc(cce, (cacheSize-1)*sizeof(CONTACTCE));
				cacheSize -= 1;
			}
			else {
				mir_free(cce);
				cce = NULL;
				cacheSize = 0;
			}
			break;
		}
	}
	LeaveCriticalSection(&csContactCache);
	return 0;
}

static INT_PTR getContactFromStringSvc( WPARAM wParam, LPARAM lParam)
{
	return getContactFromString(( CONTACTSINFO* )wParam );
}

int initContactModule()
{
	InitializeCriticalSection(&csContactCache);
	hContactSettingChangedHook = HookEvent(ME_DB_CONTACT_SETTINGCHANGED, contactSettingChanged);
	hGetContactFromStringService = CreateServiceFunction(MS_VARS_GETCONTACTFROMSTRING, getContactFromStringSvc);
	return 0;
}

int deinitContactModule()
{
	DestroyServiceFunction(hGetContactFromStringService);
	UnhookEvent(hContactSettingChangedHook);
	DeleteCriticalSection(&csContactCache);
	return 0;
}

// returns a string in the form <PROTOID:UNIQUEID>, cannot be _HANDLE_!
// result must be freed
TCHAR *encodeContactToString(HANDLE hContact)
{
	DBVARIANT dbv;

	ZeroMemory(&dbv, sizeof(DBVARIANT));
	char *szProto = GetContactProto(hContact);
	TCHAR *tszUniqueId = getContactInfoT(CNF_UNIQUEID, hContact);
	if (szProto == NULL || tszUniqueId == NULL)
		return NULL;

	TCHAR *tszResult = (TCHAR*)mir_calloc((_tcslen(tszUniqueId) + strlen(szProto) + 4) * sizeof(TCHAR));
	if (tszResult == NULL)
		return NULL;

	TCHAR *tszProto = mir_a2t(szProto);
	
	if (tszProto == NULL)
		return NULL;

	wsprintf(tszResult, _T("<%s:%s>"), tszProto, tszUniqueId);

	mir_free(tszProto);

	return tszResult;
}

// returns a contact from a string in the form <PROTOID:UNIQUEID>
// returns INVALID_HANDLE_VALUE in case of an error.
HANDLE *decodeContactFromString(TCHAR *tszContact)
{
	HANDLE hContact = INVALID_HANDLE_VALUE;
	CONTACTSINFO ci;
	ZeroMemory(&ci, sizeof(CONTACTSINFO));
	ci.cbSize = sizeof(CONTACTSINFO);
	ci.tszContact = tszContact;
	ci.flags = CI_PROTOID|CI_TCHAR;
	int count = getContactFromString( &ci );
	if (count != 1) {
		if (ci.hContacts != NULL)
			mir_free(ci.hContacts);

		return ( HANDLE* )hContact;
	}
	if (ci.hContacts != NULL) {
		hContact = ci.hContacts[0];
		mir_free(ci.hContacts);
	}

	return ( HANDLE* )hContact;
}