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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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/. */

#include <tchar.h>
#include "nsWabAddressBook.h"
#include "mozilla/Logging.h"
#include <algorithm>

#ifdef PR_LOGGING
static PRLogModuleInfo* gWabAddressBookLog
    = PR_NewLogModule("nsWabAddressBookLog");
#endif

#define PRINTF(args) MOZ_LOG(gWabAddressBookLog, mozilla::LogLevel::Debug, args)

using namespace mozilla;

HMODULE nsWabAddressBook::mLibrary = NULL ;
int32_t nsWabAddressBook::mLibUsage = 0 ;
LPWABOPEN nsWabAddressBook::mWABOpen = NULL ;
LPWABOBJECT nsWabAddressBook::mRootSession = NULL ;
LPADRBOOK nsWabAddressBook::mRootBook = NULL ;

BOOL nsWabAddressBook::LoadWabLibrary(void)
{
    if (mLibrary) { ++ mLibUsage ; return TRUE ; }
    // We try to fetch the location of the WAB DLL from the registry
    TCHAR wabDLLPath [MAX_PATH] ;
    DWORD keyType = 0 ;
    ULONG byteCount = sizeof(wabDLLPath) ;
    HKEY keyHandle = NULL ;
    wabDLLPath [MAX_PATH - 1] = 0 ;
    if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, WAB_DLL_PATH_KEY, 0, KEY_READ, &keyHandle) == ERROR_SUCCESS) {
        RegQueryValueEx(keyHandle, "", NULL, &keyType, (LPBYTE) wabDLLPath, &byteCount) ;
        if (keyType == REG_EXPAND_SZ) {
            // Expand the environment variables
            DWORD bufferSize = ExpandEnvironmentStrings(wabDLLPath, NULL, 0);
            if (bufferSize && bufferSize < MAX_PATH) {
                TCHAR tmp[MAX_PATH];
                ExpandEnvironmentStrings(wabDLLPath, tmp, bufferSize);
                _tcscpy(wabDLLPath, tmp);
            }
            else {
                return FALSE;
            }
        }
    }
    else {
        if (GetSystemDirectory(wabDLLPath, MAX_PATH)) {
            _tcsncat(wabDLLPath, WAB_DLL_NAME,
                     std::min(_tcslen(WAB_DLL_NAME), MAX_PATH - _tcslen(wabDLLPath) - 1));
        }
        else {
            return FALSE;
        }
    }
    if (keyHandle) { RegCloseKey(keyHandle) ; }
    mLibrary = LoadLibrary( (lstrlen(wabDLLPath)) ? wabDLLPath : WAB_DLL_NAME );
    if (!mLibrary) { return FALSE ; }
    ++ mLibUsage ;
    mWABOpen = reinterpret_cast<LPWABOPEN>(GetProcAddress(mLibrary, "WABOpen")) ;
    if (!mWABOpen) { return FALSE ; }
    HRESULT retCode = mWABOpen(&mRootBook, &mRootSession, NULL, 0) ;

    if (HR_FAILED(retCode)) {
        PRINTF(("Cannot initialize WAB %08x.\n", retCode)) ; return FALSE ;
    }
    return TRUE ;
}

void nsWabAddressBook::FreeWabLibrary(void)
{
    if (mLibrary) {
        if (-- mLibUsage == 0) {
            if (mRootBook) { mRootBook->Release() ; }
            if (mRootSession) { mRootSession->Release() ; }
            FreeLibrary(mLibrary) ;
            mLibrary = NULL ;
        }
    }
}

nsWabAddressBook::nsWabAddressBook(void)
: nsAbWinHelper()
{
    BOOL result = Initialize() ;

    NS_ASSERTION(result == TRUE, "Couldn't initialize Wab Helper") ;
    MOZ_COUNT_CTOR(nsWabAddressBook) ;
}

nsWabAddressBook::~nsWabAddressBook(void)
{
    MutexAutoLock guard(*mMutex) ;
    FreeWabLibrary() ;
    MOZ_COUNT_DTOR(nsWabAddressBook) ;
}

BOOL nsWabAddressBook::Initialize(void)
{
    if (mAddressBook) { return TRUE ; }
    MutexAutoLock guard(*mMutex) ;

    if (!LoadWabLibrary()) {
        PRINTF(("Cannot load library.\n")) ;
        return FALSE ;
    }
    mAddressBook = mRootBook ;
    return TRUE ;
}

void nsWabAddressBook::AllocateBuffer(ULONG aByteCount, LPVOID *aBuffer)
{
    mRootSession->AllocateBuffer(aByteCount, aBuffer) ;
}

void nsWabAddressBook::FreeBuffer(LPVOID aBuffer)
{
    mRootSession->FreeBuffer(aBuffer) ;
}