/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla 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/MPL/
 *
 * 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 Communicator client code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK *****
 *
 *
 * This Original Code has been modified by IBM Corporation.
 * Modifications made by IBM described herein are
 * Copyright (c) International Business Machines
 * Corporation, 2000
 *
 * Modifications to Mozilla code or documentation
 * identified per MPL Section 3.3
 *
 * Date         Modified by     Description of modification
 * 03/27/2000   IBM Corp.       Added PR_CALLBACK for Optlink
 *                               use in OS2
 */


/*

  A package of routines shared by the XUL content code.

 */


#include "nsCOMPtr.h"
#include "nsIContent.h"
#include "nsINodeInfo.h"
#include "nsIDocument.h"
#include "nsIDOMElement.h"
#include "nsIDOMXULCommandDispatcher.h"
#include "nsIDOMXULDocument.h"
#include "nsIRDFNode.h"
#include "nsINameSpaceManager.h"
#include "nsIRDFService.h"
#include "nsIServiceManager.h"
#include "nsIURL.h"
#include "nsXULContentUtils.h"
#include "nsIXULPrototypeCache.h"
#include "nsLayoutCID.h"
#include "nsNetUtil.h"
#include "nsRDFCID.h"
#include "nsString.h"
#include "nsXPIDLString.h"
#include "nsGkAtoms.h"
#include "prlog.h"
#include "prtime.h"
#include "rdf.h"
#include "nsContentUtils.h"
#include "nsIDateTimeFormat.h"
#include "nsDateTimeFormatCID.h"
#include "nsIScriptableDateFormat.h"
#include "nsICollation.h"
#include "nsCollationCID.h"
#include "nsILocale.h"
#include "nsILocaleService.h"

static NS_DEFINE_CID(kRDFServiceCID,        NS_RDFSERVICE_CID);

//------------------------------------------------------------------------

nsrefcnt nsXULContentUtils::gRefCnt;
nsIRDFService* nsXULContentUtils::gRDF;
nsIDateTimeFormat* nsXULContentUtils::gFormat;
nsICollation *nsXULContentUtils::gCollation;

#define XUL_RESOURCE(ident, uri) nsIRDFResource* nsXULContentUtils::ident
#define XUL_LITERAL(ident, val) nsIRDFLiteral* nsXULContentUtils::ident
#include "nsXULResourceList.h"
#undef XUL_RESOURCE
#undef XUL_LITERAL

//------------------------------------------------------------------------
// Constructors n' stuff
//

nsresult
nsXULContentUtils::Init()
{
    if (gRefCnt++ == 0) {
        nsresult rv = CallGetService(kRDFServiceCID, &gRDF);
        if (NS_FAILED(rv)) {
            return rv;
        }

#define XUL_RESOURCE(ident, uri)                              \
  PR_BEGIN_MACRO                                              \
   rv = gRDF->GetResource(NS_LITERAL_CSTRING(uri), &(ident)); \
   if (NS_FAILED(rv)) return rv;                              \
  PR_END_MACRO

#define XUL_LITERAL(ident, val)                                   \
  PR_BEGIN_MACRO                                                  \
   rv = gRDF->GetLiteral(NS_LITERAL_STRING(val).get(), &(ident)); \
   if (NS_FAILED(rv)) return rv;                                  \
  PR_END_MACRO

#include "nsXULResourceList.h"
#undef XUL_RESOURCE
#undef XUL_LITERAL

        rv = CallCreateInstance(NS_DATETIMEFORMAT_CONTRACTID, &gFormat);
        if (NS_FAILED(rv)) {
            return rv;
        }
    }

    return NS_OK;
}


nsresult
nsXULContentUtils::Finish()
{
    if (--gRefCnt == 0) {
        NS_IF_RELEASE(gRDF);

#define XUL_RESOURCE(ident, uri) NS_IF_RELEASE(ident)
#define XUL_LITERAL(ident, val) NS_IF_RELEASE(ident)
#include "nsXULResourceList.h"
#undef XUL_RESOURCE
#undef XUL_LITERAL

        NS_IF_RELEASE(gFormat);
        NS_IF_RELEASE(gCollation);
    }

    return NS_OK;
}

nsICollation*
nsXULContentUtils::GetCollation()
{
    if (!gCollation) {
        nsresult rv;

        // get a locale service 
        nsCOMPtr<nsILocaleService> localeService =
            do_GetService(NS_LOCALESERVICE_CONTRACTID, &rv);
        if (NS_SUCCEEDED(rv)) {
            nsCOMPtr<nsILocale> locale;
            rv = localeService->GetApplicationLocale(getter_AddRefs(locale));
            if (NS_SUCCEEDED(rv) && locale) {
                nsCOMPtr<nsICollationFactory> colFactory =
                    do_CreateInstance(NS_COLLATIONFACTORY_CONTRACTID);
                if (colFactory) {
                    rv = colFactory->CreateCollation(locale, &gCollation);
                    NS_ASSERTION(NS_SUCCEEDED(rv),
                                 "couldn't create collation instance");
                } else
                    NS_ERROR("couldn't create instance of collation factory");
            } else
                NS_ERROR("unable to get application locale");
        } else
            NS_ERROR("couldn't get locale factory");
    }

    return gCollation;
}

//------------------------------------------------------------------------

nsresult
nsXULContentUtils::FindChildByTag(nsIContent* aElement,
                                  PRInt32 aNameSpaceID,
                                  nsIAtom* aTag,
                                  nsIContent** aResult)
{
    PRUint32 count = aElement->GetChildCount();

    for (PRUint32 i = 0; i < count; ++i) {
        nsIContent *kid = aElement->GetChildAt(i);

        if (kid->NodeInfo()->Equals(aTag, aNameSpaceID)) {
            NS_ADDREF(*aResult = kid);

            return NS_OK;
        }
    }

    *aResult = nsnull;
    return NS_RDF_NO_VALUE; // not found
}


nsresult
nsXULContentUtils::GetElementResource(nsIContent* aElement, nsIRDFResource** aResult)
{
    // Perform a reverse mapping from an element in the content model
    // to an RDF resource.
    nsresult rv;

    PRUnichar buf[128];
    nsFixedString id(buf, NS_ARRAY_LENGTH(buf), 0);

    // Whoa.  Why the "id" attribute?  What if it's not even a XUL
    // element?  This is totally bogus!
    aElement->GetAttr(kNameSpaceID_None, nsGkAtoms::id, id);
    if (id.IsEmpty())
        return NS_ERROR_FAILURE;

    // Since the element will store its ID attribute as a document-relative value,
    // we may need to qualify it first...
    nsCOMPtr<nsIDocument> doc = aElement->GetDocument();
    NS_ASSERTION(doc, "element is not in any document");
    if (! doc)
        return NS_ERROR_FAILURE;

    rv = nsXULContentUtils::MakeElementResource(doc, id, aResult);
    if (NS_FAILED(rv)) return rv;

    return NS_OK;
}


/*
	Note: this routine is similar, yet distinctly different from, nsBookmarksService::GetTextForNode
*/

nsresult
nsXULContentUtils::GetTextForNode(nsIRDFNode* aNode, nsAString& aResult)
{
    if (! aNode) {
        aResult.Truncate();
        return NS_OK;
    }

    nsresult rv;

    // Literals are the most common, so try these first.
    nsCOMPtr<nsIRDFLiteral> literal = do_QueryInterface(aNode);
    if (literal) {
        const PRUnichar* p;
        rv = literal->GetValueConst(&p);
        if (NS_FAILED(rv)) return rv;

        aResult = p;
        return NS_OK;
    }

    nsCOMPtr<nsIRDFDate> dateLiteral = do_QueryInterface(aNode);
    if (dateLiteral) {
        PRInt64	value;
        rv = dateLiteral->GetValue(&value);
        if (NS_FAILED(rv)) return rv;

        nsAutoString str;
        rv = gFormat->FormatPRTime(nsnull /* nsILocale* locale */,
                                  kDateFormatShort,
                                  kTimeFormatSeconds,
                                  PRTime(value),
                                  str);
        aResult.Assign(str);

        if (NS_FAILED(rv)) return rv;

        return NS_OK;
    }

    nsCOMPtr<nsIRDFInt> intLiteral = do_QueryInterface(aNode);
    if (intLiteral) {
        PRInt32	value;
        rv = intLiteral->GetValue(&value);
        if (NS_FAILED(rv)) return rv;

        aResult.Truncate();
        nsAutoString intStr;
        intStr.AppendInt(value, 10);
        aResult.Append(intStr);
        return NS_OK;
    }


    nsCOMPtr<nsIRDFResource> resource = do_QueryInterface(aNode);
    if (resource) {
        const char* p;
        rv = resource->GetValueConst(&p);
        if (NS_FAILED(rv)) return rv;
        CopyUTF8toUTF16(p, aResult);
        return NS_OK;
    }

    NS_ERROR("not a resource or a literal");
    return NS_ERROR_UNEXPECTED;
}

nsresult
nsXULContentUtils::MakeElementURI(nsIDocument* aDocument,
                                  const nsAString& aElementID,
                                  nsCString& aURI)
{
    // Convert an element's ID to a URI that can be used to refer to
    // the element in the XUL graph.

    nsIURI *docURL = aDocument->GetDocumentURI();
    NS_ENSURE_TRUE(docURL, NS_ERROR_UNEXPECTED);

    nsCOMPtr<nsIURI> docURIClone;
    nsresult rv = docURL->Clone(getter_AddRefs(docURIClone));
    NS_ENSURE_SUCCESS(rv, rv);

    nsCOMPtr<nsIURL> mutableURL(do_QueryInterface(docURIClone));
    NS_ENSURE_TRUE(mutableURL, NS_ERROR_NOT_AVAILABLE);

    rv = mutableURL->SetRef(NS_ConvertUTF16toUTF8(aElementID));
    NS_ENSURE_SUCCESS(rv, rv);

    return mutableURL->GetSpec(aURI);
}


nsresult
nsXULContentUtils::MakeElementResource(nsIDocument* aDocument, const nsAString& aID, nsIRDFResource** aResult)
{
    nsresult rv;

    char buf[256];
    nsFixedCString uri(buf, sizeof(buf), 0);
    rv = MakeElementURI(aDocument, aID, uri);
    if (NS_FAILED(rv)) return rv;

    rv = gRDF->GetResource(uri, aResult);
    NS_ASSERTION(NS_SUCCEEDED(rv), "unable to create resource");
    if (NS_FAILED(rv)) return rv;

    return NS_OK;
}



nsresult
nsXULContentUtils::MakeElementID(nsIDocument* aDocument,
                                 const nsACString& aURI,
                                 nsAString& aElementID)
{
    // Convert a URI into an element ID that can be accessed from the
    // DOM APIs.
    nsCOMPtr<nsIURI> uri;
    nsresult rv = NS_NewURI(getter_AddRefs(uri), aURI,
                            aDocument->GetDocumentCharacterSet().get());
    NS_ENSURE_SUCCESS(rv, rv);

    nsCOMPtr<nsIURL> url = do_QueryInterface(uri);
    if (url) {
        nsCAutoString ref;
        url->GetRef(ref);
        CopyUTF8toUTF16(ref, aElementID);
    } else {
        aElementID.Truncate();
    }

    return NS_OK;
}

nsresult
nsXULContentUtils::GetResource(PRInt32 aNameSpaceID, nsIAtom* aAttribute, nsIRDFResource** aResult)
{
    // construct a fully-qualified URI from the namespace/tag pair.
    NS_PRECONDITION(aAttribute != nsnull, "null ptr");
    if (! aAttribute)
        return NS_ERROR_NULL_POINTER;

    nsresult rv;

    nsAutoString attr;
    rv = aAttribute->ToString(attr);
    if (NS_FAILED(rv)) return rv;

    return GetResource(aNameSpaceID, attr, aResult);
}


nsresult
nsXULContentUtils::GetResource(PRInt32 aNameSpaceID, const nsAString& aAttribute, nsIRDFResource** aResult)
{
    // construct a fully-qualified URI from the namespace/tag pair.

    // XXX should we allow nodes with no namespace???
    //NS_PRECONDITION(aNameSpaceID != kNameSpaceID_Unknown, "no namespace");
    //if (aNameSpaceID == kNameSpaceID_Unknown)
    //    return NS_ERROR_UNEXPECTED;

    nsresult rv;

    PRUnichar buf[256];
    nsFixedString uri(buf, NS_ARRAY_LENGTH(buf), 0);
    if (aNameSpaceID != kNameSpaceID_Unknown && aNameSpaceID != kNameSpaceID_None) {
        rv = nsContentUtils::NameSpaceManager()->GetNameSpaceURI(aNameSpaceID, uri);
        // XXX ignore failure; treat as "no namespace"
    }

    // XXX check to see if we need to insert a '/' or a '#'. Oy.
    if (!uri.IsEmpty()  && uri.Last() != '#' && uri.Last() != '/' && aAttribute.First() != '#')
        uri.Append(PRUnichar('#'));

    uri.Append(aAttribute);

    rv = gRDF->GetUnicodeResource(uri, aResult);
    NS_ASSERTION(NS_SUCCEEDED(rv), "unable to get resource");
    if (NS_FAILED(rv)) return rv;

    return NS_OK;
}


nsresult
nsXULContentUtils::SetCommandUpdater(nsIDocument* aDocument, nsIContent* aElement)
{
    // Deal with setting up a 'commandupdater'. Pulls the 'events' and
    // 'targets' attributes off of aElement, and adds it to the
    // document's command dispatcher.
    NS_PRECONDITION(aDocument != nsnull, "null ptr");
    if (! aDocument)
        return NS_ERROR_NULL_POINTER;

    NS_PRECONDITION(aElement != nsnull, "null ptr");
    if (! aElement)
        return NS_ERROR_NULL_POINTER;

    nsresult rv;

    nsCOMPtr<nsIDOMXULDocument> xuldoc = do_QueryInterface(aDocument);
    NS_ASSERTION(xuldoc != nsnull, "not a xul document");
    if (! xuldoc)
        return NS_ERROR_UNEXPECTED;

    nsCOMPtr<nsIDOMXULCommandDispatcher> dispatcher;
    rv = xuldoc->GetCommandDispatcher(getter_AddRefs(dispatcher));
    NS_ASSERTION(NS_SUCCEEDED(rv), "unable to get dispatcher");
    if (NS_FAILED(rv)) return rv;

    NS_ASSERTION(dispatcher != nsnull, "no dispatcher");
    if (! dispatcher)
        return NS_ERROR_UNEXPECTED;

    nsAutoString events;
    aElement->GetAttr(kNameSpaceID_None, nsGkAtoms::events, events);
    if (events.IsEmpty())
        events.AssignLiteral("*");

    nsAutoString targets;
    aElement->GetAttr(kNameSpaceID_None, nsGkAtoms::targets, targets);

    if (targets.IsEmpty())
        targets.AssignLiteral("*");

    nsCOMPtr<nsIDOMElement> domelement = do_QueryInterface(aElement);
    NS_ASSERTION(domelement != nsnull, "not a DOM element");
    if (! domelement)
        return NS_ERROR_UNEXPECTED;

    rv = dispatcher->AddCommandUpdater(domelement, events, targets);
    if (NS_FAILED(rv)) return rv;

    return NS_OK;
}