// UserRegistrar.cpp: Implementierung der Klasse UserRegistrar.
//
//////////////////////////////////////////////////////////////////////

#include "userregistrar.hxx"
#include "registryvalueimpl.hxx"
#include "windowsregistry.hxx"
#include "registryexception.hxx"

#ifdef _MSC_VER
#pragma warning(disable : 4350)
#endif

//--------------------------------------
/**
*/
UserRegistrar::UserRegistrar(const RegistrationContextInformation& RegContext) :
    Registrar(RegContext)
{
    RegistryKey RegKey = WindowsRegistry().GetCurrentUserKey();
    m_RootKey = RegKey->OpenSubKey(L"Software\\Classes");
}

//###################################
// Command
//###################################

//--------------------------------------
/**
*/
void UserRegistrar::UnregisterAsHtmlEditorForInternetExplorer() const
{
    Registrar::UnregisterAsHtmlEditorForInternetExplorer();

    DeleteHtmFileAssociationKeys();

    try
    {
        RegistryKey RegKey = m_RootKey->OpenSubKey(L"Applications");
        if ((0 == RegKey->GetSubValueCount()) && (0 == RegKey->GetSubKeyCount()))
        {
            RegKey->Close();
            m_RootKey->DeleteSubKey(L"Applications");
        }
    }
    catch(RegistryKeyNotFoundException&)
    {
    }
}

//--------------------------------------
/**
*/
void UserRegistrar::RegisterAsDefaultShellHtmlEditor() const
{
    RegistryKey LocalHtmKey = m_RootKey->CreateSubKey(L".htm");

    if (!LocalHtmKey->HasValue(DEFAULT_VALUE_NAME))
    {
        RegistryKey HKCRKey = WindowsRegistry().GetClassesRootKey();

        if (HKCRKey->HasSubKey(L".htm"))
        {
            RegistryKey RootHtmKey = HKCRKey->OpenSubKey(L".htm", false);

            if (RootHtmKey->HasValue(DEFAULT_VALUE_NAME))
            {
                RegistryValue RegVal = RootHtmKey->GetValue(DEFAULT_VALUE_NAME);

                std::wstring RootHtmFwdKey = RegVal->GetDataAsUniString();

                if (HKCRKey->HasSubKey(RootHtmFwdKey))
                {
                    m_RootKey->CreateSubKey(RootHtmFwdKey);
                    LocalHtmKey->CopyValue(RootHtmKey, DEFAULT_VALUE_NAME);
                }
            }
        }
    }

    // calling base class method
    Registrar::RegisterAsDefaultShellHtmlEditor();
}

//--------------------------------------
/**
*/
void UserRegistrar::UnregisterAsDefaultShellHtmlEditor() const
{
    // calling base class method
    Registrar::UnregisterAsDefaultShellHtmlEditor();
    DeleteHtmFileAssociationKeys();
}

//--------------------------------------
/**
*/
void UserRegistrar::UnregisterForMsOfficeApplication(
        const std::wstring& FileExtension) const
{
    /// calling base class method
    Registrar::UnregisterForMsOfficeApplication(FileExtension);

    if (m_RootKey->HasSubKey(FileExtension))
    {
        RegistryKey RegKey = m_RootKey->OpenSubKey(FileExtension);

        if ((0 == RegKey->GetSubKeyCount()) && (0 == RegKey->GetSubValueCount()))
        {
            RegKey->Close();
            m_RootKey->DeleteSubKey(FileExtension);
        }
    }
}

//--------------------------------------
/**
*/
RegistryKey UserRegistrar::GetRootKeyForDefHtmlEditorForIERegistration() const
{
    return WindowsRegistry().GetCurrentUserKey();
}

//--------------------------------------
/**
*/
void UserRegistrar::DeleteHtmFileAssociationKeys() const
{
    // Later delete the created keys if they are empty and have not changed meanwhile.
    // Remeber: if we create a new registry key in the user part of the
    // registry, changes to that key via the merged key HKEY_CLASSES_ROOT
    // go into the user branch HKEY_CURRENT_USER and are not visible for other users.
    // so we must carefully detect if the keys have not changed in order to prevent accidentally
    // deleting a key and so destroying existing associations
    // See MSDN: "Merged View of HKEY_CLASSES_ROOT"
}