/* -*- 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 "nsIDOMHTMLBRElement.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 "nsIHTMLAttributes.h"

static NS_DEFINE_IID(kIDOMHTMLBRElementIID, NS_IDOMHTMLBRELEMENT_IID);

class nsHTMLBRElement : public nsIDOMHTMLBRElement,
                        public nsIScriptObjectOwner,
                        public nsIDOMEventReceiver,
                        public nsIHTMLContent
{
public:
  nsHTMLBRElement(nsIAtom* aTag);
  virtual ~nsHTMLBRElement();

  // 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)

  // nsIDOMHTMLBRElement
  NS_IMETHOD GetClear(nsString& aClear);
  NS_IMETHOD SetClear(const nsString& aClear);

  // 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:
  nsGenericHTMLLeafElement mInner;
};

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

nsHTMLBRElement::nsHTMLBRElement(nsIAtom* aTag)
{
  NS_INIT_REFCNT();
  mInner.Init(this, aTag);
}

nsHTMLBRElement::~nsHTMLBRElement()
{
}

NS_IMPL_ADDREF(nsHTMLBRElement)

NS_IMPL_RELEASE(nsHTMLBRElement)

nsresult
nsHTMLBRElement::QueryInterface(REFNSIID aIID, void** aInstancePtr)
{
  NS_IMPL_HTML_CONTENT_QUERY_INTERFACE(aIID, aInstancePtr, this)
  if (aIID.Equals(kIDOMHTMLBRElementIID)) {
    nsIDOMHTMLBRElement* tmp = this;
    *aInstancePtr = (void*) tmp;
    NS_ADDREF_THIS();
    return NS_OK;
  }
  return NS_NOINTERFACE;
}

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

NS_IMPL_STRING_ATTR(nsHTMLBRElement, Clear, clear)

static nsGenericHTMLElement::EnumTable kClearTable[] = {
  { "left", NS_STYLE_CLEAR_LEFT },
  { "right", NS_STYLE_CLEAR_RIGHT },
  { "all", NS_STYLE_CLEAR_LEFT_AND_RIGHT },
  { "both", NS_STYLE_CLEAR_LEFT_AND_RIGHT },
  { 0 }
};

NS_IMETHODIMP
nsHTMLBRElement::StringToAttribute(nsIAtom* aAttribute,
                                   const nsString& aValue,
                                   nsHTMLValue& aResult)
{
  if (aAttribute == nsHTMLAtoms::clear) {
    if (nsGenericHTMLElement::ParseEnumValue(aValue, kClearTable, aResult)) {
      return NS_CONTENT_ATTR_HAS_VALUE;
    }
  }
  return NS_CONTENT_ATTR_NOT_THERE;
}

NS_IMETHODIMP
nsHTMLBRElement::AttributeToString(nsIAtom* aAttribute,
                                   const nsHTMLValue& aValue,
                                   nsString& aResult) const
{
  if (aAttribute == nsHTMLAtoms::clear) {
    if (eHTMLUnit_Enumerated == aValue.GetUnit()) {
      nsGenericHTMLElement::EnumValueToString(aValue, kClearTable, aResult);
      return NS_CONTENT_ATTR_HAS_VALUE;
    }
  }
  return mInner.AttributeToString(aAttribute, aValue, aResult);
}

static void
MapAttributesInto(const nsIHTMLMappedAttributes* aAttributes,
                  nsIStyleContext* aContext,
                  nsIPresContext* aPresContext)
{
  nsStyleDisplay* display = (nsStyleDisplay*)
    aContext->GetMutableStyleData(eStyleStruct_Display);

  nsHTMLValue value;
  aAttributes->GetAttribute(nsHTMLAtoms::clear, value);
  if (value.GetUnit() == eHTMLUnit_Enumerated) {
    display->mBreakType = value.GetIntValue();
  }
  nsGenericHTMLElement::MapCommonAttributesInto(aAttributes, aContext, aPresContext);
}

NS_IMETHODIMP
nsHTMLBRElement::GetMappedAttributeImpact(const nsIAtom* aAttribute,
                                          PRInt32& aHint) const
{
  if (! nsGenericHTMLElement::GetCommonMappedAttributesImpact(aAttribute, aHint)) {
    if (nsHTMLAtoms::clear == aAttribute) {
      aHint = NS_STYLE_HINT_REFLOW;
    }
    else {
      aHint = NS_STYLE_HINT_CONTENT;
    }
  }
  return NS_OK;
}

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


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