/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set tw=80 expandtab softtabstop=2 ts=2 sw=2: */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: NPL 1.1/GPL 2.0/LGPL 2.1
 *
 * 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 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):
 *   Daniel Glazman <glazman@netscape.com>
 *
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either 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 NPL, 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 NPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */
#include "nsCOMPtr.h"
#include "nsHTMLUtils.h"
#include "nsReadableUtils.h"
#include "nsUnicharUtils.h"
#include "nsIDOMHTMLAnchorElement.h"
#include "nsIDOMNSHTMLAnchorElement.h"
#include "nsIDOMEventReceiver.h"
#include "nsIHTMLContent.h"
#include "nsIHTMLDocument.h"
#include "nsGenericHTMLElement.h"
#include "nsILink.h"
#include "nsHTMLAtoms.h"
#include "nsHTMLIIDs.h"
#include "nsStyleConsts.h"
#include "nsIPresContext.h"
#include "nsIEventStateManager.h"
#include "nsIURL.h"
#include "nsIEventStateManager.h"
#include "nsIDOMEvent.h"
#include "nsNetUtil.h"
#include "nsCRT.h"

// For GetText().
#include "nsIContentIterator.h"
#include "nsIDOMText.h"
#include "nsIEnumerator.h"

#include "nsCOMPtr.h"
#include "nsIFrameManager.h"
#include "nsIPresShell.h"
#include "nsIDocument.h"
#include "nsHTMLAttributes.h"

nsresult NS_NewContentIterator(nsIContentIterator** aInstancePtrResult);

// XXX suppress

// XXX either suppress is handled in the event code below OR we need a
// custom frame

class nsHTMLAnchorElement : public nsGenericHTMLContainerElement,
                            public nsIDOMHTMLAnchorElement,
                            public nsIDOMNSHTMLAnchorElement,
                            public nsILink
{
public:
  nsHTMLAnchorElement();
  virtual ~nsHTMLAnchorElement();

  // nsISupports
  NS_DECL_ISUPPORTS_INHERITED

  // nsIDOMNode
  NS_FORWARD_NSIDOMNODE_NO_CLONENODE(nsGenericHTMLContainerElement::)

  // nsIDOMElement
  NS_FORWARD_NSIDOMELEMENT(nsGenericHTMLContainerElement::)

  // nsIDOMHTMLElement
  NS_FORWARD_NSIDOMHTMLELEMENT(nsGenericHTMLContainerElement::)

  // nsIDOMHTMLAnchorElement
  NS_DECL_NSIDOMHTMLANCHORELEMENT  

  // nsIDOMNSHTMLAnchorElement
  NS_DECL_NSIDOMNSHTMLANCHORELEMENT

  // nsILink
  NS_IMETHOD GetLinkState(nsLinkState &aState);
  NS_IMETHOD SetLinkState(nsLinkState aState);
  NS_IMETHOD GetHrefCString(char* &aBuf);

  NS_IMETHOD SetDocument(nsIDocument* aDocument, PRBool aDeep,
                         PRBool aCompileEventHandlers);
  NS_IMETHOD SetFocus(nsIPresContext* aPresContext);
  NS_IMETHOD RemoveFocus(nsIPresContext* aPresContext);
  NS_IMETHOD StringToAttribute(nsIAtom* aAttribute,
                               const nsAString& aValue,
                               nsHTMLValue& aResult);
  NS_IMETHOD HandleDOMEvent(nsIPresContext* aPresContext, nsEvent* aEvent,
                            nsIDOMEvent** aDOMEvent, PRUint32 aFlags,
                            nsEventStatus* aEventStatus);

  NS_IMETHOD SetAttr(PRInt32 aNameSpaceID, nsIAtom* aName,
                     const nsAString& aValue,
                     PRBool aNotify);
  NS_IMETHOD SetAttr(nsINodeInfo* aNodeInfo,
                     const nsAString& aValue,
                     PRBool aNotify);
  NS_IMETHOD UnsetAttr(PRInt32 aNameSpaceID, nsIAtom* aAttribute, PRBool aNotify);

#ifdef DEBUG
  NS_IMETHOD SizeOf(nsISizeOfHandler* aSizer, PRUint32* aResult) const;
#endif

protected:
  nsresult RegUnRegAccessKey(PRBool aDoReg);

  // The cached visited state
  nsLinkState mLinkState;

};


nsresult
NS_NewHTMLAnchorElement(nsIHTMLContent** aInstancePtrResult,
                        nsINodeInfo *aNodeInfo)
{
  NS_ENSURE_ARG_POINTER(aInstancePtrResult);

  nsHTMLAnchorElement* it = new nsHTMLAnchorElement();

  if (!it) {
    return NS_ERROR_OUT_OF_MEMORY;
  }

  nsresult rv = it->Init(aNodeInfo);

  if (NS_FAILED(rv)) {
    delete it;

    return rv;
  }

  *aInstancePtrResult = NS_STATIC_CAST(nsIHTMLContent *, it);
  NS_ADDREF(*aInstancePtrResult);

  return NS_OK;
}


nsHTMLAnchorElement::nsHTMLAnchorElement() : mLinkState(eLinkState_Unknown)
{
  nsHTMLUtils::AddRef(); // for GetHrefCString
}

nsHTMLAnchorElement::~nsHTMLAnchorElement()
{
  nsHTMLUtils::Release(); // for GetHrefCString
}


NS_IMPL_ADDREF_INHERITED(nsHTMLAnchorElement, nsGenericElement) 
NS_IMPL_RELEASE_INHERITED(nsHTMLAnchorElement, nsGenericElement) 


// QueryInterface implementation for nsHTMLAnchorElement
NS_HTML_CONTENT_INTERFACE_MAP_BEGIN(nsHTMLAnchorElement,
                                    nsGenericHTMLContainerElement)
  NS_INTERFACE_MAP_ENTRY(nsIDOMHTMLAnchorElement)
  NS_INTERFACE_MAP_ENTRY(nsIDOMNSHTMLAnchorElement)
  NS_INTERFACE_MAP_ENTRY(nsILink)
  NS_INTERFACE_MAP_ENTRY_CONTENT_CLASSINFO(HTMLAnchorElement)
NS_HTML_CONTENT_INTERFACE_MAP_END


nsresult
nsHTMLAnchorElement::CloneNode(PRBool aDeep, nsIDOMNode** aReturn)
{
  NS_ENSURE_ARG_POINTER(aReturn);
  *aReturn = nsnull;

  nsHTMLAnchorElement* it = new nsHTMLAnchorElement();

  if (!it) {
    return NS_ERROR_OUT_OF_MEMORY;
  }

  nsCOMPtr<nsIDOMNode> kungFuDeathGrip(it);

  nsresult rv = it->Init(mNodeInfo);

  if (NS_FAILED(rv))
    return rv;

  CopyInnerTo(this, it, aDeep);

  *aReturn = NS_STATIC_CAST(nsIDOMNode *, it);

  NS_ADDREF(*aReturn);

  return NS_OK;
}


NS_IMPL_STRING_ATTR(nsHTMLAnchorElement, Charset, charset)
NS_IMPL_STRING_ATTR(nsHTMLAnchorElement, Coords, coords)
NS_IMPL_STRING_ATTR(nsHTMLAnchorElement, Hreflang, hreflang)
NS_IMPL_STRING_ATTR(nsHTMLAnchorElement, Name, name)
NS_IMPL_STRING_ATTR(nsHTMLAnchorElement, Rel, rel)
NS_IMPL_STRING_ATTR(nsHTMLAnchorElement, Rev, rev)
NS_IMPL_STRING_ATTR(nsHTMLAnchorElement, Shape, shape)
NS_IMPL_INT_ATTR(nsHTMLAnchorElement, TabIndex, tabindex)
NS_IMPL_STRING_ATTR(nsHTMLAnchorElement, Type, type)


NS_IMETHODIMP
nsHTMLAnchorElement::GetAccessKey(nsAString& aValue)
{
  NS_STATIC_CAST(nsIHTMLContent *, this)->GetAttr(kNameSpaceID_None,
                                                  nsHTMLAtoms::accesskey,
                                                  aValue);
  return NS_OK;
}

NS_IMETHODIMP
nsHTMLAnchorElement::SetAccessKey(const nsAString& aValue)
{
  RegUnRegAccessKey(PR_FALSE);

  nsresult rv = NS_STATIC_CAST(nsIHTMLContent *,
                               this)->SetAttr(kNameSpaceID_None,
                                              nsHTMLAtoms::accesskey,
                                              aValue,
                                              PR_TRUE);

  if (!aValue.IsEmpty()) {
    RegUnRegAccessKey(PR_TRUE);
  }

  return rv;
}


// This goes and gets the proper PresContext in order
// for it to get the EventStateManager so it can register 
// the access key
nsresult nsHTMLAnchorElement::RegUnRegAccessKey(PRBool aDoReg)
{
  // first check to see if it even has an acess key
  nsAutoString accessKey;
  nsresult rv;

  rv = NS_STATIC_CAST(nsIContent *, this)->GetAttr(kNameSpaceID_None,
                                                   nsHTMLAtoms::accesskey,
                                                   accessKey);

  if (NS_CONTENT_ATTR_NOT_THERE != rv) {
    nsCOMPtr<nsIPresContext> presContext;
    GetPresContext(this, getter_AddRefs(presContext));

    // With a valid PresContext we can get the EVM 
    // and register the access key
    if (presContext) {
      nsCOMPtr<nsIEventStateManager> stateManager;
      presContext->GetEventStateManager(getter_AddRefs(stateManager));

      if (stateManager) {
        if (aDoReg) {
          return stateManager->RegisterAccessKey(nsnull, this,
                                                 (PRUint32)accessKey.First());
        } else {
          return stateManager->UnregisterAccessKey(nsnull, this,
                                                   (PRUint32)accessKey.First());
        }
      }
    }
  }

  return NS_ERROR_FAILURE;
}

NS_IMETHODIMP
nsHTMLAnchorElement::SetDocument(nsIDocument* aDocument, PRBool aDeep,
                                 PRBool aCompileEventHandlers)
{
  // The document gets set to null before it is destroyed,
  // so we unregister the the access key here (if it has one)
  // before setting it to null
  if (aDocument == nsnull) {
    RegUnRegAccessKey(PR_FALSE);
  }

  nsresult rv;
  rv = nsGenericHTMLContainerElement::SetDocument(aDocument,
                                                  aDeep,
                                                  aCompileEventHandlers);

  // Register the access key here (if it has one) 
  // if the document isn't null
  if (aDocument != nsnull) {
    RegUnRegAccessKey(PR_TRUE);
  }

  return rv;
}

NS_IMETHODIMP
nsHTMLAnchorElement::Blur()
{
  return SetElementFocus(PR_FALSE);
}

NS_IMETHODIMP
nsHTMLAnchorElement::Focus()
{
  return SetElementFocus(PR_TRUE);
}

NS_IMETHODIMP
nsHTMLAnchorElement::SetFocus(nsIPresContext* aPresContext)
{
  NS_ENSURE_ARG_POINTER(aPresContext);
  // don't make the link grab the focus if there is no link handler
  nsCOMPtr<nsILinkHandler> handler;
  nsresult rv = aPresContext->GetLinkHandler(getter_AddRefs(handler));
  if (NS_SUCCEEDED(rv) && (nsnull != handler)) {
    nsCOMPtr<nsIEventStateManager> stateManager;

    aPresContext->GetEventStateManager(getter_AddRefs(stateManager));

    if (stateManager) {
      stateManager->SetContentState(this, NS_EVENT_STATE_FOCUS);

      // Make sure the presentation is up-to-date
      if (mDocument) {
        mDocument->FlushPendingNotifications();
      }

      nsCOMPtr<nsIPresShell> presShell;
      aPresContext->GetShell(getter_AddRefs(presShell));

      if (presShell) {
        nsIFrame* frame = nsnull;
        presShell->GetPrimaryFrameFor(this, &frame);
        if (frame) {
          presShell->ScrollFrameIntoView(frame, NS_PRESSHELL_SCROLL_ANYWHERE,
                                         NS_PRESSHELL_SCROLL_ANYWHERE);
        }
      }
    }
  }

  return NS_OK;
}

NS_IMETHODIMP
nsHTMLAnchorElement::RemoveFocus(nsIPresContext* aPresContext)
{
  NS_ENSURE_ARG_POINTER(aPresContext);
  // If we are disabled, we probably shouldn't have focus in the
  // first place, so allow it to be removed.
  nsresult rv = NS_OK;

  nsCOMPtr<nsIEventStateManager> esm;
  aPresContext->GetEventStateManager(getter_AddRefs(esm));

  if (esm) {
    nsCOMPtr<nsIDocument> doc;
    GetDocument(*getter_AddRefs(doc));
    if (!doc)
      return NS_ERROR_NULL_POINTER;

    nsCOMPtr<nsIContent> rootContent;
    doc->GetRootContent(getter_AddRefs(rootContent));
    rv = esm->SetContentState(rootContent, NS_EVENT_STATE_FOCUS);
  }

  return rv;
}

NS_IMETHODIMP
nsHTMLAnchorElement::StringToAttribute(nsIAtom* aAttribute,
                                       const nsAString& aValue,
                                       nsHTMLValue& aResult)
{
  if (aAttribute == nsHTMLAtoms::tabindex) {
    if (ParseValue(aValue, 0, 32767, aResult, eHTMLUnit_Integer)) {
      return NS_CONTENT_ATTR_HAS_VALUE;
    }
  }
  else if (aAttribute == nsHTMLAtoms::suppress) {
    if (!aValue.Equals(NS_LITERAL_STRING("true"),
                       nsCaseInsensitiveStringComparator())) {
      aResult.SetEmptyValue();  // XXX? shouldn't just leave "true"
      return NS_CONTENT_ATTR_HAS_VALUE;
    }
  }
  return NS_CONTENT_ATTR_NOT_THERE;
}

// XXX support suppress in here
NS_IMETHODIMP
nsHTMLAnchorElement::HandleDOMEvent(nsIPresContext* aPresContext,
                                    nsEvent* aEvent,
                                    nsIDOMEvent** aDOMEvent,
                                    PRUint32 aFlags,
                                    nsEventStatus* aEventStatus)
{
  return HandleDOMEventForAnchors(this, aPresContext, aEvent, aDOMEvent, 
                                  aFlags, aEventStatus);
}

NS_IMETHODIMP
nsHTMLAnchorElement::GetHref(nsAString& aValue)
{
  char *buf;
  nsresult rv = GetHrefCString(buf);
  if (NS_FAILED(rv)) return rv;
  if (buf) {
    aValue.Assign(NS_ConvertUTF8toUCS2(buf));
    nsCRT::free(buf);
  }
  // NS_IMPL_STRING_ATTR does nothing where we have (buf == null)
  return NS_OK;
}

NS_IMETHODIMP
nsHTMLAnchorElement::SetHref(const nsAString& aValue)
{
  // Clobber our "cache", so we'll recompute it the next time
  // somebody asks for it.
  mLinkState = eLinkState_Unknown;

  return NS_STATIC_CAST(nsIContent *, this)->SetAttr(kNameSpaceID_HTML,
                                                     nsHTMLAtoms::href,
                                                     aValue, PR_TRUE);
}

NS_IMETHODIMP
nsHTMLAnchorElement::GetTarget(nsAString& aValue)
{
  aValue.Truncate();

  nsresult rv;
  rv = NS_STATIC_CAST(nsIContent *, this)->GetAttr(kNameSpaceID_HTML,
                                                   nsHTMLAtoms::target,
                                                   aValue);
  if (rv == NS_CONTENT_ATTR_NOT_THERE && mDocument) {
    rv = mDocument->GetBaseTarget(aValue);
    NS_ENSURE_SUCCESS(rv, rv);
  }
  return NS_OK;
}

NS_IMETHODIMP
nsHTMLAnchorElement::SetTarget(const nsAString& aValue)
{
  return NS_STATIC_CAST(nsIContent *, this)->SetAttr(kNameSpaceID_HTML,
                                                     nsHTMLAtoms::target,
                                                     aValue, PR_TRUE);
}

#ifdef DEBUG
NS_IMETHODIMP
nsHTMLAnchorElement::SizeOf(nsISizeOfHandler* aSizer, PRUint32* aResult) const
{
  *aResult = sizeof(*this) + BaseSizeOf(aSizer);

  return NS_OK;
}
#endif


NS_IMETHODIMP    
nsHTMLAnchorElement::GetProtocol(nsAString& aProtocol)
{
  nsAutoString href;

  nsresult rv = GetHref(href);
  if (NS_FAILED(rv))
    return rv;

  nsCOMPtr<nsIDocument> doc;
  mNodeInfo->GetDocument(*getter_AddRefs(doc));

  return GetProtocolFromHrefString(href, aProtocol, doc);
}

NS_IMETHODIMP
nsHTMLAnchorElement::SetProtocol(const nsAString& aProtocol)
{
  nsAutoString href, new_href;
  nsresult rv = GetHref(href);
  if (NS_FAILED(rv))
    return rv;

  rv = SetProtocolInHrefString(href, aProtocol, new_href);
  if (NS_FAILED(rv))
    // Ignore failures to be compatible with NS4
    return NS_OK;

  return SetHref(new_href);
}

NS_IMETHODIMP    
nsHTMLAnchorElement::GetHost(nsAString& aHost)
{
  nsAutoString href;
  
  nsresult rv = GetHref(href);
  if (NS_FAILED(rv))
    return rv;

  return GetHostFromHrefString(href, aHost);
}

NS_IMETHODIMP
nsHTMLAnchorElement::SetHost(const nsAString& aHost)
{
  nsAutoString href, new_href;
  nsresult rv = GetHref(href);
  if (NS_FAILED(rv))
    return rv;

  rv = SetHostInHrefString(href, aHost, new_href);
  if (NS_FAILED(rv))
    // Ignore failures to be compatible with NS4
    return NS_OK;

  return SetHref(new_href);
}

NS_IMETHODIMP    
nsHTMLAnchorElement::GetHostname(nsAString& aHostname)
{
  nsAutoString href;
  nsresult rv = GetHref(href);
  if (NS_FAILED(rv))
    return rv;

  return GetHostnameFromHrefString(href, aHostname);
}

NS_IMETHODIMP
nsHTMLAnchorElement::SetHostname(const nsAString& aHostname)
{
  nsAutoString href, new_href;
  nsresult rv = GetHref(href);
  if (NS_FAILED(rv))
    return rv;

  rv = SetHostnameInHrefString(href, aHostname, new_href);
  if (NS_FAILED(rv))
    // Ignore failures to be compatible with NS4
    return NS_OK;
  
  return SetHref(new_href);
}

NS_IMETHODIMP    
nsHTMLAnchorElement::GetPathname(nsAString& aPathname)
{
  nsAutoString href;
 
  nsresult rv = GetHref(href);
  if (NS_FAILED(rv))
    return rv;

  return GetPathnameFromHrefString(href, aPathname);
}

NS_IMETHODIMP
nsHTMLAnchorElement::SetPathname(const nsAString& aPathname)
{
  nsAutoString href, new_href;
  nsresult rv = GetHref(href);
  if (NS_FAILED(rv))
    return rv;

  rv = SetPathnameInHrefString(href, aPathname, new_href);
  if (NS_FAILED(rv))
    // Ignore failures to be compatible with NS4
    return NS_OK;

  return SetHref(new_href);
}

NS_IMETHODIMP    
nsHTMLAnchorElement::GetSearch(nsAString& aSearch)
{
  nsAutoString href;

  nsresult rv = GetHref(href);
  if (NS_FAILED(rv))
    return rv;

  return GetSearchFromHrefString(href, aSearch);
}

NS_IMETHODIMP
nsHTMLAnchorElement::SetSearch(const nsAString& aSearch)
{
  nsAutoString href, new_href;
  nsresult rv = GetHref(href);

  if (NS_FAILED(rv))
    return rv;

  rv = SetSearchInHrefString(href, aSearch, new_href);
  if (NS_FAILED(rv))
    // Ignore failures to be compatible with NS4
    return NS_OK;

  return SetHref(new_href);
}

NS_IMETHODIMP    
nsHTMLAnchorElement::GetPort(nsAString& aPort)
{
  nsAutoString href;
  
  nsresult rv = GetHref(href);
  if (NS_FAILED(rv))
    return rv;

  return GetPortFromHrefString(href, aPort);
}

NS_IMETHODIMP
nsHTMLAnchorElement::SetPort(const nsAString& aPort)
{
  nsAutoString href, new_href;
  nsresult rv = GetHref(href);

  if (NS_FAILED(rv))
    return rv;

  rv = SetPortInHrefString(href, aPort, new_href);
  if (NS_FAILED(rv))
    // Ignore failures to be compatible with NS4
    return NS_OK;
  
  return SetHref(new_href);
}

NS_IMETHODIMP    
nsHTMLAnchorElement::GetHash(nsAString& aHash)
{
  nsAutoString href;

  nsresult rv = GetHref(href);
  if (NS_FAILED(rv))
    return rv;

  return GetHashFromHrefString(href, aHash);
}

NS_IMETHODIMP
nsHTMLAnchorElement::SetHash(const nsAString& aHash)
{
  nsAutoString href, new_href;
  nsresult rv = GetHref(href);

  if (NS_FAILED(rv))
    return rv;

  rv = SetHashInHrefString(href, aHash, new_href);
  if (NS_FAILED(rv))
    // Ignore failures to be compatible with NS4
    return NS_OK;

  return SetHref(new_href);
}

NS_IMETHODIMP    
nsHTMLAnchorElement::GetText(nsAString& aText)
{
  aText.Truncate();

  // Since this is a Netscape 4 proprietary attribute, we have to implement
  // the same behavior. Basically it is returning the last text node of
  // of the anchor. Returns an empty string if there is no text node.
  // The nsIContentIterator does exactly what we want, if we start the 
  // iteration from the end.
  nsCOMPtr<nsIContentIterator> iter;
  nsresult rv = NS_NewContentIterator(getter_AddRefs(iter));
  NS_ENSURE_SUCCESS(rv, rv);

  // Initialize the content iterator with the children of the anchor
  iter->Init(this);

  nsCOMPtr<nsIContent> curNode;

  // Position the iterator. Last() is the anchor itself, this is not what we 
  // want. Prev() positions the iterator to the last child of the anchor,
  // starting at the deepest level of children, just like NS4 does.
  rv = iter->Last();
  NS_ENSURE_SUCCESS(rv, rv);
  rv = iter->Prev();
  NS_ENSURE_SUCCESS(rv, rv);

  iter->CurrentNode(getter_AddRefs(curNode));

  while(curNode && (NS_ENUMERATOR_FALSE == iter->IsDone())) {
    nsCOMPtr<nsIDOMText> textNode(do_QueryInterface(curNode));
    if(textNode) {
      // The current node is a text node. Get its value and break the loop.
      textNode->GetData(aText);
      break;
    }

    rv = iter->Prev();
    NS_ENSURE_SUCCESS(rv, rv);
    iter->CurrentNode(getter_AddRefs(curNode));
  }

  return NS_OK;
}

NS_IMETHODIMP
nsHTMLAnchorElement::ToString(nsAString& aSource)
{
  return GetHref(aSource);
}

NS_IMETHODIMP
nsHTMLAnchorElement::GetLinkState(nsLinkState &aState)
{
  aState = mLinkState;
  return NS_OK;
}

NS_IMETHODIMP
nsHTMLAnchorElement::SetLinkState(nsLinkState aState)
{
  mLinkState = aState;
  return NS_OK;
}

NS_IMETHODIMP
nsHTMLAnchorElement::GetHrefCString(char* &aBuf)
{
  // Get href= attribute (relative URL).
  nsAutoString relURLSpec;

  if (NS_CONTENT_ATTR_HAS_VALUE ==
      NS_STATIC_CAST(nsIContent *, this)->GetAttr(kNameSpaceID_HTML,
                                                  nsHTMLAtoms::href,
                                                  relURLSpec)) {
    // Clean up any leading or trailing whitespace
    relURLSpec.Trim(" \t\n\r");

    // Get base URL.
    nsCOMPtr<nsIURI> baseURL;
    GetBaseURL(*getter_AddRefs(baseURL));

    if (baseURL) {
      // Get absolute URL.
      nsCAutoString buf;
      NS_MakeAbsoluteURIWithCharset(buf, relURLSpec, mDocument, baseURL,
                                    nsHTMLUtils::IOService,
                                    nsHTMLUtils::CharsetMgr);
      aBuf = ToNewCString(buf);
    }
    else {
      // Absolute URL is same as relative URL.
      aBuf = ToNewUTF8String(relURLSpec);
    }
  }
  else {
    // Absolute URL is null to say we have no HREF.
    aBuf = nsnull;
  }

  return NS_OK;
}

NS_IMETHODIMP
nsHTMLAnchorElement::SetAttr(PRInt32 aNameSpaceID, nsIAtom* aName,
                             const nsAString& aValue,
                             PRBool aNotify)
{
  if (aName == nsHTMLAtoms::href && kNameSpaceID_None == aNameSpaceID) {
    nsAutoString val;
    GetHref(val);
    if (!val.Equals(aValue)) {
      SetLinkState(eLinkState_Unknown);
    }
  }

  return nsGenericHTMLElement::SetAttr(aNameSpaceID, aName, aValue, aNotify);
}

NS_IMETHODIMP
nsHTMLAnchorElement::SetAttr(nsINodeInfo* aNodeInfo,
                             const nsAString& aValue,
                             PRBool aNotify)
{
  return nsGenericHTMLElement::SetAttr(aNodeInfo, aValue, aNotify);
}

nsresult
nsHTMLAnchorElement::UnsetAttr(PRInt32 aNameSpaceID, nsIAtom* aAttribute, PRBool aNotify)
{
  if (aAttribute == nsHTMLAtoms::href && kNameSpaceID_None == aNameSpaceID) {
      SetLinkState(eLinkState_Unknown);
  }
  // We still rely on the old way of setting the attribute.
  return nsGenericHTMLElement::UnsetAttr(aNameSpaceID, aAttribute, aNotify);
}
