/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * 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 Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation. All
 * Rights Reserved.
 *
 * Contributor(s): 
 */
#include "nsIDOMHTMLAreaElement.h"
#include "nsIDOMNSHTMLAreaElement.h"
#include "nsIScriptObjectOwner.h"
#include "nsIDOMEventReceiver.h"
#include "nsIHTMLContent.h"
#include "nsGenericHTMLElement.h"
#include "nsILink.h"
#include "nsHTMLAtoms.h"
#include "nsHTMLIIDs.h"
#include "nsIStyleContext.h"
#include "nsIMutableStyleContext.h"
#include "nsStyleConsts.h"
#include "nsIPresContext.h"
#include "nsIEventStateManager.h"
#include "nsIURL.h"
#include "nsNetUtil.h"
#include "nsHTMLUtils.h"


class nsHTMLAreaElement : public nsIDOMHTMLAreaElement,
                          public nsIDOMNSHTMLAreaElement,
                          public nsIJSScriptObject,
                          public nsILink,
                          public nsIHTMLContent
{
public:
  nsHTMLAreaElement(nsINodeInfo *aNodeInfo);
  virtual ~nsHTMLAreaElement();

  // nsISupports
  NS_DECL_ISUPPORTS

  // nsIDOMNode
  NS_IMPL_IDOMNODE_USING_GENERIC(mInner)

  // nsIDOMElement
  NS_IMPL_IDOMELEMENT_USING_GENERIC(mInner)

  // nsIDOMHTMLElement
  NS_IMPL_IDOMHTMLELEMENT_USING_GENERIC(mInner)

  // nsIDOMHTMLAreaElement
  NS_DECL_IDOMHTMLAREAELEMENT

  // nsIDOMNSHTMLAreaElement
  NS_DECL_IDOMNSHTMLAREAELEMENT

  // nsIJSScriptObject
  NS_IMPL_IJSSCRIPTOBJECT_USING_GENERIC(mInner)

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

  // nsIContent
  NS_IMPL_ICONTENT_NO_FOCUS_USING_GENERIC(mInner)
  
  // nsIHTMLContent
  NS_IMPL_IHTMLCONTENT_USING_GENERIC(mInner)

protected:
  nsGenericHTMLLeafElement mInner;

  // The cached visited state
  nsLinkState mLinkState;
};

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

  nsIHTMLContent* it = new nsHTMLAreaElement(aNodeInfo);
  if (nsnull == it) {
    return NS_ERROR_OUT_OF_MEMORY;
  }
  return it->QueryInterface(NS_GET_IID(nsIHTMLContent), (void**) aInstancePtrResult);
}


nsHTMLAreaElement::nsHTMLAreaElement(nsINodeInfo *aNodeInfo)
  : mLinkState(eLinkState_Unknown)
{
  NS_INIT_REFCNT();
  mInner.Init(this, aNodeInfo);
  nsHTMLUtils::AddRef(); // for GetHrefCString
}

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

NS_IMPL_ADDREF(nsHTMLAreaElement)

NS_IMPL_RELEASE(nsHTMLAreaElement)

nsresult
nsHTMLAreaElement::QueryInterface(REFNSIID aIID, void** aInstancePtr)
{
  NS_IMPL_HTML_CONTENT_QUERY_INTERFACE(aIID, aInstancePtr, this)
  if (aIID.Equals(NS_GET_IID(nsIDOMHTMLAreaElement))) {
    nsIDOMHTMLAreaElement* tmp = this;
    *aInstancePtr = (void*) tmp;
    NS_ADDREF_THIS();
    return NS_OK;
  }
  else if (aIID.Equals(NS_GET_IID(nsIDOMNSHTMLAreaElement))) {
    nsIDOMNSHTMLAreaElement* tmp = this;
    *aInstancePtr = (void*) tmp;
    NS_ADDREF_THIS();
    return NS_OK;
  }
  else if (aIID.Equals(NS_GET_IID(nsILink))) {
    *aInstancePtr = (void*)(nsILink*) this;
    NS_ADDREF_THIS();
    return NS_OK;
  }
  return NS_NOINTERFACE;
}

nsresult
nsHTMLAreaElement::CloneNode(PRBool aDeep, nsIDOMNode** aReturn)
{
  nsHTMLAreaElement* it = new nsHTMLAreaElement(mInner.mNodeInfo);
  if (nsnull == it) {
    return NS_ERROR_OUT_OF_MEMORY;
  }
  nsCOMPtr<nsIDOMNode> kungFuDeathGrip(it);
  mInner.CopyInnerTo(this, &it->mInner, aDeep);
  return it->QueryInterface(NS_GET_IID(nsIDOMNode), (void**) aReturn);
}

NS_IMPL_STRING_ATTR(nsHTMLAreaElement, AccessKey, accesskey)
NS_IMPL_STRING_ATTR(nsHTMLAreaElement, Alt, alt)
NS_IMPL_STRING_ATTR(nsHTMLAreaElement, Coords, coords)
NS_IMPL_BOOL_ATTR(nsHTMLAreaElement, NoHref, nohref)
NS_IMPL_STRING_ATTR(nsHTMLAreaElement, Shape, shape)
NS_IMPL_INT_ATTR(nsHTMLAreaElement, TabIndex, tabindex)
NS_IMPL_STRING_ATTR(nsHTMLAreaElement, Target, target)

NS_IMETHODIMP
nsHTMLAreaElement::StringToAttribute(nsIAtom* aAttribute,
                                     const nsAReadableString& aValue,
                                     nsHTMLValue& aResult)
{
  if (aAttribute == nsHTMLAtoms::nohref) {
    aResult.SetEmptyValue();
    return NS_CONTENT_ATTR_HAS_VALUE;
  }
  else if (aAttribute == nsHTMLAtoms::tabindex) {
    if (nsGenericHTMLElement::ParseValue(aValue, 0, aResult, eHTMLUnit_Integer)) {
      return NS_CONTENT_ATTR_HAS_VALUE;
    }
  }

  return NS_CONTENT_ATTR_NOT_THERE;
}

NS_IMETHODIMP
nsHTMLAreaElement::AttributeToString(nsIAtom* aAttribute,
                                     const nsHTMLValue& aValue,
                                     nsAWritableString& aResult) const
{
  return mInner.AttributeToString(aAttribute, aValue, aResult);
}

static void
MapAttributesInto(const nsIHTMLMappedAttributes* aAttributes,
                  nsIMutableStyleContext* aContext,
                  nsIPresContext* aPresContext)
{
  nsGenericHTMLElement::MapCommonAttributesInto(aAttributes, aContext, aPresContext);
}

NS_IMETHODIMP
nsHTMLAreaElement::GetMappedAttributeImpact(const nsIAtom* aAttribute,
                                            PRInt32& aHint) const

{
  if (! nsGenericHTMLElement::GetCommonMappedAttributesImpact(aAttribute, aHint)) {
    aHint = NS_STYLE_HINT_CONTENT;
  }
  return NS_OK;
}


NS_IMETHODIMP
nsHTMLAreaElement::GetAttributeMappingFunctions(nsMapAttributesFunc& aFontMapFunc,
                                                nsMapAttributesFunc& aMapFunc) const
{
  aFontMapFunc = nsnull;
  aMapFunc = &MapAttributesInto;
  return NS_OK;
}


NS_IMETHODIMP
nsHTMLAreaElement::HandleDOMEvent(nsIPresContext* aPresContext,
                                  nsEvent* aEvent,
                                  nsIDOMEvent** aDOMEvent,
                                  PRUint32 aFlags,
                                  nsEventStatus* aEventStatus)
{
  return mInner.HandleDOMEventForAnchors(this,
                                         aPresContext, 
                                         aEvent, 
                                         aDOMEvent, 
                                         aFlags, 
                                         aEventStatus);
}

NS_IMETHODIMP
nsHTMLAreaElement::SetFocus(nsIPresContext* aPresContext)
{
  nsIEventStateManager* esm;
  if (NS_OK == aPresContext->GetEventStateManager(&esm)) {
    esm->SetContentState(this, NS_EVENT_STATE_FOCUS);
    NS_RELEASE(esm);
  }
  return NS_OK;
}

NS_IMETHODIMP
nsHTMLAreaElement::RemoveFocus(nsIPresContext* aPresContext)
{
  nsIEventStateManager* esm;
  if (NS_OK == aPresContext->GetEventStateManager(&esm)) {
    esm->SetContentState(nsnull, NS_EVENT_STATE_FOCUS);
    NS_RELEASE(esm);
  }
  return NS_OK;
}

NS_IMETHODIMP
nsHTMLAreaElement::GetHref(nsAWritableString& aValue)
{
  char *buf;
  nsresult rv = GetHrefCString(buf);
  if (NS_FAILED(rv)) return rv;
  if (buf) {
    aValue.Assign(NS_ConvertASCIItoUCS2(buf));
    nsCRT::free(buf);
  }
  // NS_IMPL_STRING_ATTR does nothing where we have (buf == null)
  return NS_OK;
}

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

  return mInner.SetAttribute(kNameSpaceID_HTML, nsHTMLAtoms::href, aValue, PR_TRUE);
}

NS_IMETHODIMP
nsHTMLAreaElement::SizeOf(nsISizeOfHandler* aSizer, PRUint32* aResult) const
{
  return mInner.SizeOf(aSizer, aResult, sizeof(*this));
}

NS_IMETHODIMP    
nsHTMLAreaElement::GetProtocol(nsAWritableString& aProtocol)
{
  nsAutoString href;
  nsIURI *url;
  nsresult result = NS_OK;
  
  result = GetHref(href);
  if (NS_OK == result) {
    result = NS_NewURI(&url, href);
    if (NS_OK == result) {
      char* protocol;
      result = url->GetScheme(&protocol);
      if (result == NS_OK) {
        aProtocol.Assign(NS_ConvertASCIItoUCS2(protocol));
        aProtocol.Append(NS_LITERAL_STRING(":"));
        nsCRT::free(protocol);
      }
      NS_RELEASE(url);
    }
  }

  return result;
}

NS_IMETHODIMP    
nsHTMLAreaElement::GetHost(nsAWritableString& aHost)
{
  nsAutoString href;
  nsIURI *url;
  nsresult result = NS_OK;
  
  result = GetHref(href);
  if (NS_OK == result) {
    result = NS_NewURI(&url, href);
    if (NS_OK == result) {
      char* host;
      result = url->GetHost(&host);
      if (result == NS_OK) {
        aHost.Assign(NS_ConvertASCIItoUCS2(host));
        nsCRT::free(host);
        PRInt32 port;
        (void)url->GetPort(&port);
        if (-1 != port) {
          aHost.Append(NS_LITERAL_STRING(":"));
          nsAutoString portStr;
          portStr.AppendInt(port, 10);
          aHost.Append(portStr);
        }
      }
      NS_RELEASE(url);
    }
  }

  return result;
}

NS_IMETHODIMP    
nsHTMLAreaElement::GetHostname(nsAWritableString& aHostname)
{
  nsAutoString href;
  nsIURI *url;
  nsresult result = NS_OK;
  
  result = GetHref(href);
  if (NS_OK == result) {
    result = NS_NewURI(&url, href);
    if (NS_OK == result) {
      char* host;
      result = url->GetHost(&host);
      if (result == NS_OK) {
        aHostname.Assign(NS_ConvertASCIItoUCS2(host));
        nsCRT::free(host);
      }
      NS_RELEASE(url);
    }
  }

  return result;
}

NS_IMETHODIMP    
nsHTMLAreaElement::GetPathname(nsAWritableString& aPathname)
{
  nsAutoString href;
  nsCOMPtr<nsIURI> uri;
  nsresult result = NS_OK;

  aPathname.Truncate();
 
  result = GetHref(href);
  NS_ENSURE_SUCCESS(result, result);

  result = NS_NewURI(getter_AddRefs(uri), href);
  NS_ENSURE_SUCCESS(result, result);

  nsCOMPtr<nsIURL> url(do_QueryInterface(uri));
  NS_ENSURE_TRUE(url, NS_OK);

  char* file;
  result = url->GetFilePath(&file);
  NS_ENSURE_SUCCESS(result, result);

  aPathname.Assign(NS_ConvertASCIItoUCS2(file));
  nsCRT::free(file);

  return result;
}

NS_IMETHODIMP    
nsHTMLAreaElement::GetSearch(nsAWritableString& aSearch)
{
  nsAutoString href;
  nsIURI *uri;
  nsresult result = NS_OK;

  result = GetHref(href);
  if (NS_OK == result) {
    result = NS_NewURI(&uri, href);
    if (NS_OK == result) {
      char *search;
      nsIURL* url;
      result = uri->QueryInterface(NS_GET_IID(nsIURL), (void**)&url);
      if (NS_SUCCEEDED(result)) {
        result = url->GetEscapedQuery(&search);
        NS_RELEASE(url);
      }
      if (result == NS_OK && (nsnull != search) && ('\0' != *search)) {
        aSearch.Assign(NS_LITERAL_STRING("?"));
        aSearch.Append(NS_ConvertASCIItoUCS2(search));
        nsCRT::free(search);
      }
      else {
        aSearch.SetLength(0);
      }
      NS_RELEASE(uri);
    }
  }

  return result;
}

NS_IMETHODIMP    
nsHTMLAreaElement::GetPort(nsAWritableString& aPort)
{
  nsAutoString href;
  nsIURI *url;
  nsresult result = NS_OK;
  
  result = GetHref(href);
  if (NS_OK == result) {
    result = NS_NewURI(&url, href);
    if (NS_OK == result) {
      aPort.SetLength(0);
      PRInt32 port;
      (void)url->GetPort(&port);
      if (-1 != port) {
        nsAutoString portStr;
        portStr.AppendInt(port, 10);
        aPort.Append(portStr);
      }
      NS_RELEASE(url);
    }
  }

  return result;
}

NS_IMETHODIMP    
nsHTMLAreaElement::GetHash(nsAWritableString& aHash)
{
  nsAutoString href;
  nsIURI *uri;
  nsresult result = NS_OK;

  result = GetHref(href);
  if (NS_OK == result) {
    result = NS_NewURI(&uri, href);

    if (NS_OK == result) {
      char *ref;
      nsIURL* url;
      result = uri->QueryInterface(NS_GET_IID(nsIURL), (void**)&url);
      if (NS_SUCCEEDED(result)) {
        result = url->GetRef(&ref);
        NS_RELEASE(url);
      }
      if (result == NS_OK && (nsnull != ref) && ('\0' != *ref)) {
        aHash.Assign(NS_LITERAL_STRING("#"));
        aHash.Append(NS_ConvertASCIItoUCS2(ref));
        nsCRT::free(ref);
      }
      else {
        aHash.SetLength(0);
      }
      NS_RELEASE(uri);
    }
  }

  return result;
}

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

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

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

  if (NS_CONTENT_ATTR_HAS_VALUE ==
      mInner.GetAttribute(kNameSpaceID_HTML, nsHTMLAtoms::href, relURLSpec)) {
    // Clean up any leading or trailing whitespace
    relURLSpec.Trim(" \t\n\r");

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

    if (baseURL) {
      // Get absolute URL.
      NS_MakeAbsoluteURIWithCharset(&aBuf, relURLSpec, mInner.mDocument, baseURL,
                                    nsHTMLUtils::IOService, nsHTMLUtils::CharsetMgr);
    }
    else {
      // Absolute URL is same as relative URL.
      aBuf = relURLSpec.ToNewUTF8String();
    }
  }
  else {
    // Absolute URL is empty because we have no HREF.
    aBuf = nsnull;
  }

  return NS_OK;
}