/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 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):
 *
 *
 * 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.
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 * ***** END LICENSE BLOCK ***** */
#include "nsIDOMHTMLHRElement.h"
#include "nsIDOMNSHTMLHRElement.h"
#include "nsIDOMEventReceiver.h"
#include "nsIHTMLContent.h"
#include "nsGenericHTMLElement.h"
#include "nsHTMLAtoms.h"
#include "nsStyleConsts.h"
#include "nsIPresContext.h"
#include "nsHTMLAttributes.h"
#include "nsRuleNode.h"

class nsHTMLHRElement : public nsGenericHTMLLeafElement,
                        public nsIDOMHTMLHRElement,
                        public nsIDOMNSHTMLHRElement
{
public:
  nsHTMLHRElement();
  virtual ~nsHTMLHRElement();

  // nsISupports
  NS_DECL_ISUPPORTS_INHERITED

  // nsIDOMNode
  NS_FORWARD_NSIDOMNODE_NO_CLONENODE(nsGenericHTMLLeafElement::)

  // nsIDOMElement
  NS_FORWARD_NSIDOMELEMENT(nsGenericHTMLLeafElement::)

  // nsIDOMHTMLElement
  NS_FORWARD_NSIDOMHTMLELEMENT(nsGenericHTMLLeafElement::)

  // nsIDOMHTMLHRElement
  NS_DECL_NSIDOMHTMLHRELEMENT

  // nsIDOMNSHTMLHRElement
  NS_DECL_NSIDOMNSHTMLHRELEMENT

  NS_IMETHOD StringToAttribute(nsIAtom* aAttribute,
                               const nsAString& aValue,
                               nsHTMLValue& aResult);
  NS_IMETHOD AttributeToString(nsIAtom* aAttribute,
                               const nsHTMLValue& aValue,
                               nsAString& aResult) const;
  NS_IMETHOD_(PRBool) HasAttributeDependentStyle(const nsIAtom* aAttribute) const;
  NS_IMETHOD GetAttributeMappingFunction(nsMapRuleToAttributesFunc& aMapRuleFunc) const;
};

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

  nsHTMLHRElement* it = new nsHTMLHRElement();

  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;
}


nsHTMLHRElement::nsHTMLHRElement()
{
}

nsHTMLHRElement::~nsHTMLHRElement()
{
}


NS_IMPL_ADDREF_INHERITED(nsHTMLHRElement, nsGenericElement) 
NS_IMPL_RELEASE_INHERITED(nsHTMLHRElement, nsGenericElement) 


// QueryInterface implementation for nsHTMLHRElement
NS_HTML_CONTENT_INTERFACE_MAP_BEGIN(nsHTMLHRElement,
                                    nsGenericHTMLLeafElement)
  NS_INTERFACE_MAP_ENTRY(nsIDOMHTMLHRElement)
  NS_INTERFACE_MAP_ENTRY(nsIDOMNSHTMLHRElement)
  NS_INTERFACE_MAP_ENTRY_CONTENT_CLASSINFO(HTMLHRElement)
NS_HTML_CONTENT_INTERFACE_MAP_END


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

  nsHTMLHRElement* it = new nsHTMLHRElement();

  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(nsHTMLHRElement, Align, align)
NS_IMPL_BOOL_ATTR(nsHTMLHRElement, NoShade, noshade)
NS_IMPL_STRING_ATTR(nsHTMLHRElement, Size, size)
NS_IMPL_STRING_ATTR(nsHTMLHRElement, Width, width)
NS_IMPL_STRING_ATTR(nsHTMLHRElement, Color, color)

static const nsHTMLValue::EnumTable kAlignTable[] = {
  { "left", NS_STYLE_TEXT_ALIGN_LEFT },
  { "right", NS_STYLE_TEXT_ALIGN_RIGHT },
  { "center", NS_STYLE_TEXT_ALIGN_CENTER },
  { 0 }
};

NS_IMETHODIMP
nsHTMLHRElement::StringToAttribute(nsIAtom* aAttribute,
                                   const nsAString& aValue,
                                   nsHTMLValue& aResult)
{
  if (aAttribute == nsHTMLAtoms::width) {
    if (aResult.ParseSpecialIntValue(aValue, eHTMLUnit_Pixel, PR_TRUE, PR_FALSE)) {
      return NS_CONTENT_ATTR_HAS_VALUE;
    }
  }
  else if (aAttribute == nsHTMLAtoms::size) {
    if (aResult.ParseIntWithBounds(aValue, eHTMLUnit_Pixel, 1, 1000)) {
      return NS_CONTENT_ATTR_HAS_VALUE;
    }
  }
  else if (aAttribute == nsHTMLAtoms::noshade) {
    aResult.SetEmptyValue();
    return NS_CONTENT_ATTR_HAS_VALUE;
  }
  else if (aAttribute == nsHTMLAtoms::align) {
    if (aResult.ParseEnumValue(aValue, kAlignTable)) {
      return NS_CONTENT_ATTR_HAS_VALUE;
    }
  }
  else if (aAttribute == nsHTMLAtoms::color) {
    if (aResult.ParseColor(aValue,
                           nsGenericHTMLLeafElement::GetOwnerDocument())) {
      return NS_CONTENT_ATTR_HAS_VALUE;
    }
  }

  return NS_CONTENT_ATTR_NOT_THERE;
}

NS_IMETHODIMP
nsHTMLHRElement::AttributeToString(nsIAtom* aAttribute,
                                   const nsHTMLValue& aValue,
                                   nsAString& aResult) const
{
  if (aAttribute == nsHTMLAtoms::align) {
    if (eHTMLUnit_Enumerated == aValue.GetUnit()) {
      aValue.EnumValueToString(kAlignTable, aResult);
      return NS_CONTENT_ATTR_HAS_VALUE;
    }
  }

  return nsGenericHTMLLeafElement::AttributeToString(aAttribute, aValue,
                                                     aResult);
}

static void
MapAttributesIntoRule(const nsIHTMLMappedAttributes* aAttributes,
                      nsRuleData* aData)
{
  if (!aAttributes || !aData)
    return;

  nsHTMLValue value;
  PRBool noshade = PR_FALSE;

  nsHTMLValue color;
  aAttributes->GetAttribute(nsHTMLAtoms::color, color);

  PRBool colorIsSet = color.GetUnit() == eHTMLUnit_Color ||
                      color.GetUnit() == eHTMLUnit_ColorName;

  if (aData->mSID == eStyleStruct_Position ||
      aData->mSID == eStyleStruct_Border) {
    if (colorIsSet) {
      noshade = PR_TRUE;
    } else {
      aAttributes->GetAttribute(nsHTMLAtoms::noshade, value);
      noshade = value.GetUnit() != eHTMLUnit_Null;
    }
  }

  if (aData->mSID == eStyleStruct_Margin) {
    // align: enum
    aAttributes->GetAttribute(nsHTMLAtoms::align, value);
    if (eHTMLUnit_Enumerated == value.GetUnit()) {
      // Map align attribute into auto side margins
      nsCSSRect& margin = aData->mMarginData->mMargin;
      switch (value.GetIntValue()) {
      case NS_STYLE_TEXT_ALIGN_LEFT:
        if (margin.mLeft.GetUnit() == eCSSUnit_Null)
          margin.mLeft.SetFloatValue(0.0f, eCSSUnit_Pixel);
        if (margin.mRight.GetUnit() == eCSSUnit_Null)
          margin.mRight.SetAutoValue();
        break;
      case NS_STYLE_TEXT_ALIGN_RIGHT:
        if (margin.mLeft.GetUnit() == eCSSUnit_Null)
          margin.mLeft.SetAutoValue();
        if (margin.mRight.GetUnit() == eCSSUnit_Null)
          margin.mRight.SetFloatValue(0.0f, eCSSUnit_Pixel);
        break;
      case NS_STYLE_TEXT_ALIGN_CENTER:
        if (margin.mLeft.GetUnit() == eCSSUnit_Null)
          margin.mLeft.SetAutoValue();
        if (margin.mRight.GetUnit() == eCSSUnit_Null)
          margin.mRight.SetAutoValue();
        break;
      }
    }
  }
  else if (aData->mSID == eStyleStruct_Position) {
    // width: pixel, percent
    if (aData->mPositionData->mWidth.GetUnit() == eCSSUnit_Null) {
      aAttributes->GetAttribute(nsHTMLAtoms::width, value);
      if (value.GetUnit() == eHTMLUnit_Pixel) {
        aData->mPositionData->mWidth.SetFloatValue((float)value.GetPixelValue(), eCSSUnit_Pixel);
      } else if (value.GetUnit() == eHTMLUnit_Percent) {
        aData->mPositionData->mWidth.SetPercentValue(value.GetPercentValue());
      }
    }

    if (aData->mPositionData->mHeight.GetUnit() == eCSSUnit_Null) {
      // size: pixel
      if (noshade) {
        // noshade case: size is set using the border
        aData->mPositionData->mHeight.SetAutoValue();
      } else {
        // normal case
        // the height includes the top and bottom borders that are initially 1px.
        // for size=1, html.css has a special case rule that makes this work by
        // removing all but the top border.
        aAttributes->GetAttribute(nsHTMLAtoms::size, value);
        if (value.GetUnit() == eHTMLUnit_Pixel) {
          aData->mPositionData->mHeight.SetFloatValue((float)value.GetPixelValue(), eCSSUnit_Pixel);
        } // else use default value from html.css
      }
    }
  }
  else if (aData->mSID == eStyleStruct_Border && noshade) { // if not noshade, border styles are dealt with by html.css
    // size: pixel
    // if a size is set, use half of it per side, otherwise, use 1px per side
    float sizePerSide;
    PRBool allSides = PR_TRUE;
    aAttributes->GetAttribute(nsHTMLAtoms::size, value);
    if (value.GetUnit() == eHTMLUnit_Pixel) {
      sizePerSide = (float)value.GetPixelValue() / 2.0f;
      if (sizePerSide < 1.0f) {
        // XXX When the pixel bug is fixed, all the special casing for
        // subpixel borders should be removed.
        // In the meantime, this makes http://www.microsoft.com/ look right.
        sizePerSide = 1.0f;
        allSides = PR_FALSE;
      }
    } else {
      sizePerSide = 1.0f; // default to a 2px high line
    }
    nsCSSRect& borderWidth = aData->mMarginData->mBorderWidth;
    if (borderWidth.mTop.GetUnit() == eCSSUnit_Null) {
      borderWidth.mTop.SetFloatValue(sizePerSide, eCSSUnit_Pixel);
    }
    if (allSides) {
      if (borderWidth.mRight.GetUnit() == eCSSUnit_Null) {
        borderWidth.mRight.SetFloatValue(sizePerSide, eCSSUnit_Pixel);
      }
      if (borderWidth.mBottom.GetUnit() == eCSSUnit_Null) {
        borderWidth.mBottom.SetFloatValue(sizePerSide, eCSSUnit_Pixel);
      }
      if (borderWidth.mLeft.GetUnit() == eCSSUnit_Null) {
        borderWidth.mLeft.SetFloatValue(sizePerSide, eCSSUnit_Pixel);
      }
    }

    // if a color is set, set the border-style to 'solid' so that the
    // 'color' property takes effect, otherwise, use '-moz-bg-solid'.
    // (we got the color attribute earlier)
    PRInt32 style = colorIsSet ? NS_STYLE_BORDER_STYLE_SOLID :
                                 NS_STYLE_BORDER_STYLE_BG_SOLID;

    nsCSSRect& borderStyle = aData->mMarginData->mBorderStyle;
    if (borderStyle.mTop.GetUnit() == eCSSUnit_Null) {
      borderStyle.mTop.SetIntValue(style, eCSSUnit_Enumerated);
    }
    if (allSides) {
      if (borderStyle.mRight.GetUnit() == eCSSUnit_Null) {
        borderStyle.mRight.SetIntValue(style, eCSSUnit_Enumerated);
      }
      if (borderStyle.mBottom.GetUnit() == eCSSUnit_Null) {
        borderStyle.mBottom.SetIntValue(style, eCSSUnit_Enumerated);
      }
      if (borderStyle.mLeft.GetUnit() == eCSSUnit_Null) {
        borderStyle.mLeft.SetIntValue(style, eCSSUnit_Enumerated);
      }

      // If it would be noticeable, set the border radius to
      // 100% on all corners
      nsCSSRect& borderRadius = aData->mMarginData->mBorderRadius;
      if (borderRadius.mTop.GetUnit() == eCSSUnit_Null) {
        borderRadius.mTop.SetPercentValue(1.0f);
      }
      if (borderRadius.mRight.GetUnit() == eCSSUnit_Null) {
        borderRadius.mRight.SetPercentValue(1.0f);
      }
      if (borderRadius.mBottom.GetUnit() == eCSSUnit_Null) {
        borderRadius.mBottom.SetPercentValue(1.0f);
      }
      if (borderRadius.mLeft.GetUnit() == eCSSUnit_Null) {
        borderRadius.mLeft.SetPercentValue(1.0f);
      }
    }
  }
  else if (aData->mSID == eStyleStruct_Color) {
    // color: a color
    // (we got the color attribute earlier)
    if (colorIsSet &&
        aData->mColorData->mColor.GetUnit() == eCSSUnit_Null) {
      aData->mColorData->mColor.SetColorValue(color.GetColorValue());
    }
  }

  nsGenericHTMLElement::MapCommonAttributesInto(aAttributes, aData);
}

NS_IMETHODIMP_(PRBool)
nsHTMLHRElement::HasAttributeDependentStyle(const nsIAtom* aAttribute) const
{
  static const AttributeDependenceEntry attributes[] = {
    { &nsHTMLAtoms::align },
    { &nsHTMLAtoms::width },
    { &nsHTMLAtoms::size },
    { &nsHTMLAtoms::color },
    { &nsHTMLAtoms::noshade },
    { nsnull },
  };
  
  static const AttributeDependenceEntry* const map[] = {
    attributes,
    sCommonAttributeMap,
  };

  return FindAttributeDependence(aAttribute, map, NS_ARRAY_LENGTH(map));
}


NS_IMETHODIMP
nsHTMLHRElement::GetAttributeMappingFunction(nsMapRuleToAttributesFunc& aMapRuleFunc) const
{
  aMapRuleFunc = &MapAttributesIntoRule;
  return NS_OK;
}
