/**************************************************************
 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * 
 *************************************************************/



#undef UNICODE
#undef _UNICODE

#define _WIN32_WINDOWS 0x0410

#ifdef _MSC_VER
#pragma warning(push, 1) /* disable warnings within system headers */
#endif
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <msiquery.h>
#ifdef _MSC_VER
#pragma warning(pop)
#endif

#include <malloc.h>
#include <assert.h>

#include <tchar.h>
#include <string>

using namespace std;

namespace 
{
    // The provided GUID must be without surrounding '{}'
    string GetGuidPart(const string& guid, int index)
    {
        assert((guid.length() == 36) && "No GUID or wrong format!"); 
        assert(((index > -1) && (index < 5)) && "Out of range!");
        
        if (index == 0) return string(guid.c_str(), 8);
        if (index == 1) return string(guid.c_str() + 9, 4);
        if (index == 2) return string(guid.c_str() + 14, 4);
        if (index == 3) return string(guid.c_str() + 19, 4);
        if (index == 4) return string(guid.c_str() + 24, 12);
        
        return string();
    }
    
    void Swap(char* p1, char* p2)
    {
        char tmp = *p1;
        *p1 = *p2;
        *p2 = tmp;
    }
    
    string Invert(const string& str)
    {
        char* buff = reinterpret_cast<char*>(_alloca(str.length()));
        strncpy(buff, str.c_str(), str.length());
        
        char* front = buff;
        char* back = buff + str.length() - 1;
        
        while (front < back)        
            Swap(front++, back--);        
        
        return string(buff, str.length());            
    }
    
    // Convert the upgrade code (which is a GUID) according
    // to the way the windows installer does when writing it
    // to the registry
    // The first 8 bytes will be inverted, from the the last 
    // 8 bytes always the nibbles will be inverted for further
    // details look in the MSDN under compressed registry keys 
    string ConvertGuid(const string& guid)
    {
        string convertedGuid;
        
        string part = GetGuidPart(guid, 0);
        convertedGuid = Invert(part);
        
        part = GetGuidPart(guid, 1);
        convertedGuid += Invert(part);
        
        part = GetGuidPart(guid, 2);
        convertedGuid += Invert(part);
        
        part = GetGuidPart(guid, 3);
        convertedGuid += Invert(string(part.c_str(), 2));
        convertedGuid += Invert(string(part.c_str() + 2, 2));
        
        part = GetGuidPart(guid, 4);        
        int pos = 0;
        for (int i = 0; i < 6; i++)
        {
            convertedGuid += Invert(string(part.c_str() + pos, 2));
            pos += 2;        
        }
        return convertedGuid;
    }
    
    string GetMsiProperty(MSIHANDLE handle, const string& sProperty)
    {
	    string	result;
	    TCHAR	szDummy[1] = TEXT("");
	    DWORD	nChars = 0;

	    if (MsiGetProperty(handle, sProperty.c_str(), szDummy, &nChars) == ERROR_MORE_DATA)
	    {
            DWORD nBytes = ++nChars * sizeof(TCHAR);
            LPTSTR buffer = reinterpret_cast<LPTSTR>(_alloca(nBytes));
            ZeroMemory( buffer, nBytes );
            MsiGetProperty(handle, sProperty.c_str(), buffer, &nChars);
            result = buffer;            
	    }
	    return	result;
    }

    inline bool IsSetMsiProperty(MSIHANDLE handle, const string& sProperty)
    {    
        return (GetMsiProperty(handle, sProperty).length() > 0);
    }

    inline void UnsetMsiProperty(MSIHANDLE handle, const string& sProperty)
    {
        MsiSetProperty(handle, sProperty.c_str(), NULL);
    }

    inline void SetMsiProperty(MSIHANDLE handle, const string& sProperty)
    {
        MsiSetProperty(handle, sProperty.c_str(), TEXT("1"));
    }

    bool RegistryKeyHasUpgradeSubKey(
        HKEY hRootKey, const string& regKey, const string& upgradeKey)
    {
        HKEY hKey;
        if (RegOpenKey(hRootKey, regKey.c_str(), &hKey) == ERROR_SUCCESS)
        {   
            DWORD nSubKeys;
            DWORD lLongestSubKey;
        
            if (RegQueryInfoKey(
                hKey, NULL, NULL, NULL, &nSubKeys, &lLongestSubKey, NULL, NULL, NULL, NULL, NULL, NULL) == ERROR_SUCCESS)
            {
                LPTSTR buffer = reinterpret_cast<LPTSTR>(_alloca(lLongestSubKey + 1));
            
                for (DWORD i = 0; i < nSubKeys; i++)
                {                        
                    LONG ret = RegEnumKey(hKey, i, buffer, lLongestSubKey + 1);                    
                    if ((ret == ERROR_SUCCESS) && (buffer == upgradeKey))     
                        return true;
                }
            }
        }
        return false;
    }
} // namespace 

extern "C" UINT __stdcall SetProductInstallMode(MSIHANDLE handle)
{
    string upgradeCode = GetMsiProperty(handle, TEXT("UpgradeCode"));                
    upgradeCode = ConvertGuid(string(upgradeCode.c_str() + 1, upgradeCode.length() - 2));
    
    //MessageBox(NULL, upgradeCode.c_str(), TEXT("Debug"), MB_OK);            
    
    if (RegistryKeyHasUpgradeSubKey(
        HKEY_CURRENT_USER, 
        TEXT("Software\\Microsoft\\Installer\\UpgradeCodes"),
        upgradeCode) && IsSetMsiProperty(handle, TEXT("ALLUSERS")))
    {        
        UnsetMsiProperty(handle, TEXT("ALLUSERS"));
        //MessageBox(NULL, "ALLUSERS removed", "DEBUG", MB_OK);
    }
    else if (RegistryKeyHasUpgradeSubKey(
             HKEY_LOCAL_MACHINE, 
             TEXT("Software\\Classes\\Installer\\UpgradeCodes"),
             upgradeCode) && !IsSetMsiProperty(handle, TEXT("ALLUSERS")))
    {
        SetMsiProperty(handle, TEXT("ALLUSERS"));
        //MessageBox(NULL, "ALLUSERS set", "DEBUG", MB_OK);
    }   
    return ERROR_SUCCESS;     
}