/* -*- 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 "nsIDOMHTMLOptionElement.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"
#include "nsIDOMText.h"

static NS_DEFINE_IID(kIDOMHTMLOptionElementIID, NS_IDOMHTMLOPTIONELEMENT_IID);
static NS_DEFINE_IID(kIDOMHTMLFormElementIID, NS_IDOMHTMLFORMELEMENT_IID);
static NS_DEFINE_IID(kIDOMTextIID, NS_IDOMTEXT_IID);
static NS_DEFINE_IID(kIFormControlIID, NS_IFORMCONTROL_IID);
static NS_DEFINE_IID(kIFormIID, NS_IFORM_IID);

class nsHTMLOptionElement : public nsIDOMHTMLOptionElement,
                     public nsIScriptObjectOwner,
                     public nsIDOMEventReceiver,
                     public nsIHTMLContent
                     //public nsIFormControl
{
public:
  nsHTMLOptionElement(nsIAtom* aTag);
  ~nsHTMLOptionElement();

  // 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)

  // nsIDOMHTMLOptionElement
  NS_IMETHOD GetForm(nsIDOMHTMLFormElement** aForm);
  NS_IMETHOD GetDefaultSelected(PRBool* aDefaultSelected);
  NS_IMETHOD SetDefaultSelected(PRBool aDefaultSelected);
  NS_IMETHOD GetText(nsString& aText);
  NS_IMETHOD GetIndex(PRInt32* aIndex);
  NS_IMETHOD SetIndex(PRInt32 aIndex);
  NS_IMETHOD GetDisabled(PRBool* aDisabled);
  NS_IMETHOD SetDisabled(PRBool aDisabled);
  NS_IMETHOD GetLabel(nsString& aLabel);
  NS_IMETHOD SetLabel(const nsString& aLabel);
  NS_IMETHOD GetSelected(PRBool* aSelected);
  NS_IMETHOD GetValue(nsString& aValue);
  NS_IMETHOD SetValue(const nsString& aValue);

  // 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)

protected:
  nsGenericHTMLContainerElement mInner;
  nsIForm* mForm;
};

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

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

nsHTMLOptionElement::~nsHTMLOptionElement()
{
  if (mForm) {
    NS_RELEASE(mForm);
  }
}

// ISupports

NS_IMETHODIMP
nsHTMLOptionElement::AddRef(void)
{
  PRInt32 refCnt = mRefCnt;  // debugging 
  return ++mRefCnt; 
}

nsresult
nsHTMLOptionElement::QueryInterface(REFNSIID aIID, void** aInstancePtr)
{
  NS_IMPL_HTML_CONTENT_QUERY_INTERFACE(aIID, aInstancePtr, this)
  if (aIID.Equals(kIDOMHTMLOptionElementIID)) {
    *aInstancePtr = (void*)(nsIDOMHTMLOptionElement*) this;
    mRefCnt++;
    return NS_OK;
  }
  return NS_NOINTERFACE;
}

// the option has a ref to the form, but not vice versa. The form can get to the
// options via the select.
NS_IMETHODIMP_(nsrefcnt)
nsHTMLOptionElement::Release()
{
  --mRefCnt;
	if (mRefCnt <= 0) {
    delete this;                                       
    return 0;                                          
  } else {
    return mRefCnt;
  }
}

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

NS_IMETHODIMP
nsHTMLOptionElement::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;
}

NS_IMETHODIMP
nsHTMLOptionElement::GetSelected(PRBool *aSelected)
{
  nsHTMLValue val;
  nsresult rv = mInner.GetHTMLAttribute(nsHTMLAtoms::selected, val);
  *aSelected = NS_CONTENT_ATTR_NOT_THERE != rv;
  return NS_OK;
}

NS_IMPL_BOOL_ATTR(nsHTMLOptionElement, DefaultSelected, defaultselected)
NS_IMPL_INT_ATTR(nsHTMLOptionElement, Index, index)
NS_IMPL_BOOL_ATTR(nsHTMLOptionElement, Disabled, disabled)
NS_IMPL_STRING_ATTR(nsHTMLOptionElement, Label, label)
NS_IMPL_STRING_ATTR(nsHTMLOptionElement, Value, value)

NS_IMETHODIMP
nsHTMLOptionElement::StringToAttribute(nsIAtom* aAttribute,
                                const nsString& aValue,
                                nsHTMLValue& aResult)
{
  if (aAttribute == nsHTMLAtoms::selected) {
    aResult.SetEmptyValue();
    return NS_CONTENT_ATTR_HAS_VALUE;
  }
  else if (aAttribute == nsHTMLAtoms::disabled) {
    aResult.SetEmptyValue();
    return NS_CONTENT_ATTR_HAS_VALUE;
  }
  return NS_CONTENT_ATTR_NOT_THERE;
}

NS_IMETHODIMP
nsHTMLOptionElement::AttributeToString(nsIAtom* aAttribute,
                                const 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
nsHTMLOptionElement::GetAttributeMappingFunction(nsMapAttributesFunc& aMapFunc) const
{
  aMapFunc = &MapAttributesInto;
  return NS_OK;
}


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

NS_IMETHODIMP
nsHTMLOptionElement::GetText(nsString& aText)
{
  aText.SetLength(0);
  nsIDOMNode* node = nsnull;
  nsresult result = mInner.GetFirstChild(&node);
  if ((NS_OK == result) && node) {
    nsIDOMText* domText = nsnull;
    result = node->QueryInterface(kIDOMTextIID, (void**)&domText);
    if ((NS_OK == result) && domText) {
      result = domText->GetData(aText);
      aText.CompressWhitespace(PR_TRUE, PR_TRUE);
      NS_RELEASE(domText);
    }
    NS_RELEASE(node);
  }
  return result;
}

NS_IMETHODIMP
nsHTMLOptionElement::GetStyleHintForAttributeChange(
    const nsIAtom* aAttribute,
    PRInt32 *aHint) const
{
  nsGenericHTMLElement::SetStyleHintForCommonAttributes(this, aAttribute, aHint);
  return NS_OK;
}
