/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * The contents of this file are subject to the Netscape Public
 * License Version 1.1 (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.mozilla.org/NPL/
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation. All
 * Rights Reserved.
 *
 * Contributor(s): 
 */

#include "nsCOMPtr.h"
#include "nsString.h"
#include "nsXPIDLString.h"
#include "nsIServiceManager.h"
#include "nsICategoryManager.h"
#include "nsISupportsPrimitives.h"
#include "nsAppStartupNotifier.h"

NS_IMPL_ISUPPORTS1(nsAppStartupNotifier, nsIObserver)

nsAppStartupNotifier::nsAppStartupNotifier()
{
    NS_INIT_ISUPPORTS();
}

nsAppStartupNotifier::~nsAppStartupNotifier()
{
}

NS_IMETHODIMP nsAppStartupNotifier::Observe(nsISupports *aSubject, const PRUnichar *aTopic, const PRUnichar *someData)
{
    NS_ENSURE_ARG(aTopic);

    nsCAutoString strCategory; 
    if(aTopic)
	    strCategory.AssignWithConversion(aTopic);

    nsresult rv;

    // now initialize all startup listeners
    nsCOMPtr<nsICategoryManager> categoryManager =
                    do_GetService(NS_CATEGORYMANAGER_CONTRACTID, &rv);
    NS_ENSURE_SUCCESS(rv, rv);

    nsCOMPtr<nsISimpleEnumerator> enumerator;
    rv = categoryManager->EnumerateCategory(strCategory.get(),
                               getter_AddRefs(enumerator));
    if (NS_FAILED(rv)) return rv;

    nsCOMPtr<nsISupports> entry;
    while (NS_SUCCEEDED(enumerator->GetNext(getter_AddRefs(entry)))) {
        nsCOMPtr<nsISupportsString> category = do_QueryInterface(entry, &rv);

        if (NS_SUCCEEDED(rv)) {
            nsXPIDLCString categoryEntry;
            rv = category->GetData(getter_Copies(categoryEntry));

            nsXPIDLCString contractId;
            categoryManager->GetCategoryEntry(strCategory.get(), 
                                    categoryEntry,
                                    getter_Copies(contractId));

            if (NS_SUCCEEDED(rv)) {

                // If we see the word "service," in the beginning
                // of the contractId then we create it as a service
                // if not we do a createInstance

                const char *pServicePrefix = "service,";
                
                nsCAutoString cid(contractId);
                PRInt32 serviceIdx = cid.Find(pServicePrefix);

                nsCOMPtr<nsIObserver> startupObserver;
                if (serviceIdx == 0)
                    startupObserver = do_GetService(cid.get() + nsCRT::strlen(pServicePrefix), &rv);
                else
                    startupObserver = do_CreateInstance(contractId, &rv);

                NS_ASSERTION(NS_SUCCEEDED(rv), "cannot create startup observer!\n");
                if (NS_SUCCEEDED(rv)) {
                    rv = startupObserver->Observe(nsnull, aTopic, nsnull);
 
                    // mainly for debugging if you want to know if your observer worked.
                    NS_ASSERTION(NS_SUCCEEDED(rv), "Startup Observer failed!\n");
                }
            }
        }
    }

    return NS_OK;
}