/* -*- 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 1.0 (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.
 */
#include "nsIDOMHTMLLabelElement.h"
#include "nsIDOMHTMLFormElement.h"
#include "nsIScriptObjectOwner.h"
#include "nsIDOMEventReceiver.h"
#include "nsIHTMLContent.h"
#include "nsGenericHTMLElement.h"
#include "nsHTMLAtoms.h"
#include "nsHTMLIIDs.h"
#include "nsIStyleContext.h"
#include "nsStyleConsts.h"
#include "nsIPresContext.h"
#include "nsIFormControl.h"
#include "nsIForm.h"

static NS_DEFINE_IID(kIDOMHTMLLabelElementIID, NS_IDOMHTMLLABELELEMENT_IID);
static NS_DEFINE_IID(kIDOMHTMLFormElementIID, NS_IDOMHTMLFORMELEMENT_IID);
static NS_DEFINE_IID(kIFormIID, NS_IFORM_IID);
static NS_DEFINE_IID(kIFormControlIID, NS_IFORMCONTROL_IID);

class nsHTMLLabelElement : public nsIDOMHTMLLabelElement,
                  public nsIScriptObjectOwner,
                  public nsIDOMEventReceiver,
                  public nsIHTMLContent,
                  public nsIFormControl

{
public:
  nsHTMLLabelElement(nsIAtom* aTag);
  ~nsHTMLLabelElement();

  // 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)

  // nsIDOMHTMLLabelElement
  NS_IMETHOD GetForm(nsIDOMHTMLFormElement** aForm);
  NS_IMETHOD SetForm(nsIDOMHTMLFormElement* aForm);
  NS_IMETHOD GetAccessKey(nsString& aAccessKey);
  NS_IMETHOD SetAccessKey(const nsString& aAccessKey);
  NS_IMETHOD GetHtmlFor(nsString& aHtmlFor);
  NS_IMETHOD SetHtmlFor(const nsString& aHtmlFor);

  // nsIScriptObjectOwner
  NS_IMPL_ISCRIPTOBJECTOWNER_USING_GENERIC(mInner)

  // nsIDOMEventReceiver
  NS_IMPL_IDOMEVENTRECEIVER_USING_GENERIC(mInner)

  // nsIContent
  NS_IMPL_ICONTENT_USING_GENERIC(mInner)

  // nsIHTMLContent
  NS_IMPL_IHTMLCONTENT_USING_GENERIC(mInner)

  // nsIFormControl
  NS_IMETHOD GetType(PRInt32* aType) { return NS_FORM_LABEL; }
  NS_IMETHOD SetWidget(nsIWidget* aWidget) { return NS_OK; }
  NS_IMETHOD Init() { return NS_OK; }

protected:
  nsGenericHTMLContainerElement mInner;
  nsIForm*                      mForm;
};

// construction, destruction
nsresult
NS_NewHTMLLabelElement(nsIHTMLContent** aInstancePtrResult, nsIAtom* aTag)
{
  NS_PRECONDITION(nsnull != aInstancePtrResult, "null ptr");
  if (nsnull == aInstancePtrResult) {
    return NS_ERROR_NULL_POINTER;
  }
  nsIHTMLContent* it = new nsHTMLLabelElement(aTag);
  if (nsnull == it) {
    return NS_ERROR_OUT_OF_MEMORY;
  }
  return it->QueryInterface(kIHTMLContentIID, (void**) aInstancePtrResult);
}

nsHTMLLabelElement::nsHTMLLabelElement(nsIAtom* aTag)
{
  NS_INIT_REFCNT();
  mInner.Init(this, aTag);
  mForm = nsnull;
}

nsHTMLLabelElement::~nsHTMLLabelElement()
{
  if (nsnull != mForm) {
    // prevent mForm from decrementing its ref count on us
    mForm->RemoveElement(this, PR_FALSE); 
    NS_RELEASE(mForm);
  }
}

// nsISupports 

NS_IMPL_ADDREF(nsHTMLLabelElement)

NS_IMETHODIMP_(nsrefcnt)
nsHTMLLabelElement::Release()
{
  --mRefCnt;
	if (mRefCnt <= 0) {
    delete this;                                       
    return 0;                                          
  } else if ((1 == mRefCnt) && mForm) { 
    mRefCnt = 0;
    delete this;
    return 0;
  } else {
    return mRefCnt;
  }
}

nsresult
nsHTMLLabelElement::QueryInterface(REFNSIID aIID, void** aInstancePtr)
{
  NS_IMPL_HTML_CONTENT_QUERY_INTERFACE(aIID, aInstancePtr, this)
  if (aIID.Equals(kIDOMHTMLLabelElementIID)) {
    *aInstancePtr = (void*)(nsIDOMHTMLLabelElement*)this;
    NS_ADDREF_THIS();
    return NS_OK;
  }
  else if (aIID.Equals(kIFormControlIID)) {
    *aInstancePtr = (void*)(nsIFormControl*) this;
    NS_ADDREF_THIS();
    return NS_OK;
  }
  return NS_NOINTERFACE;
}

// nsIDOMHTMLLabelElement

nsresult
nsHTMLLabelElement::CloneNode(PRBool aDeep, nsIDOMNode** aReturn)
{
  nsHTMLLabelElement* it = new nsHTMLLabelElement(mInner.mTag);
  if (nsnull == it) {
    return NS_ERROR_OUT_OF_MEMORY;
  }
  mInner.CopyInnerTo(this, &it->mInner);
  return it->QueryInterface(kIDOMNodeIID, (void**) aReturn);
}

NS_IMETHODIMP
nsHTMLLabelElement::GetForm(nsIDOMHTMLFormElement** aForm)
{
  nsresult result = NS_OK;
  *aForm = nsnull;
  if (nsnull != mForm) {
    nsIDOMHTMLFormElement* formElem = nsnull;
    result = mForm->QueryInterface(kIDOMHTMLFormElementIID, (void**)&formElem);
    if (NS_OK == result) {
      *aForm = formElem;
    }
  }
  return result;
}

// An important assumption is that if aForm is null, the previous mForm will not be released
// This allows nsHTMLFormElement to deal with circular references.
NS_IMETHODIMP
nsHTMLLabelElement::SetForm(nsIDOMHTMLFormElement* aForm)
{
  nsresult result = NS_OK;
	if (nsnull == aForm) {
    mForm = nsnull;
    return NS_OK;
  } else {
    NS_IF_RELEASE(mForm);
    nsIFormControl* formControl = nsnull;
    result = QueryInterface(kIFormControlIID, (void**)&formControl);
    if ((NS_OK == result) && formControl) {
      result = aForm->QueryInterface(kIFormIID, (void**)&mForm); // keep the ref
      if ((NS_OK == result) && mForm) {
        mForm->AddElement(formControl);
      }
      NS_RELEASE(formControl);
    }
  }
  return result;
}

NS_IMPL_STRING_ATTR(nsHTMLLabelElement, AccessKey, accesskey, eSetAttrNotify_None)
//NS_IMPL_STRING_ATTR(nsHTMLLabelElement, HtmlFor, _for, eSetAttrNotify_None)

NS_IMETHODIMP
nsHTMLLabelElement::GetHtmlFor(nsString& aValue)
{
  mInner.GetAttribute(nsHTMLAtoms::_for, aValue);                 
  return NS_OK;                                                    
}  

NS_IMETHODIMP
nsHTMLLabelElement::SetHtmlFor(const nsString& aValue)
{
  // trim leading and trailing whitespace 
  static char whitespace[] = " \r\n\t";
  nsString value(aValue);
  value.Trim(whitespace, PR_TRUE, PR_TRUE);
  return mInner.SetAttribute(nsHTMLAtoms::defaultvalue, value, PR_TRUE);
}

NS_IMETHODIMP
nsHTMLLabelElement::StringToAttribute(nsIAtom* aAttribute,
                                      const nsString& aValue,
                                      nsHTMLValue& aResult)
{
  return NS_CONTENT_ATTR_NOT_THERE;
}

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

static void
MapAttributesInto(nsIHTMLAttributes* aAttributes,
                  nsIStyleContext* aContext,
                  nsIPresContext* aPresContext)
{
  nsGenericHTMLElement::MapCommonAttributesInto(aAttributes, aContext, aPresContext);
}

NS_IMETHODIMP
nsHTMLLabelElement::GetAttributeMappingFunction(nsMapAttributesFunc& aMapFunc) const
{
  aMapFunc = &MapAttributesInto;
  return NS_OK;
}

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