/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/* Here is the list, from beppe and glazman:
    href >> A, AREA, BASE, LINK
    src >> FRAME, IFRAME, IMG, INPUT, SCRIPT
    <META http-equiv="refresh" content="3,http://www.acme.com/intro.html">
    longdesc >> FRAME, IFRAME, IMG
    usemap >> IMG, INPUT, OBJECT
    action >> FORM
    background >> BODY
    codebase >> OBJECT, APPLET
    classid >> OBJECT
    data >> OBJECT
    cite >> BLOCKQUOTE, DEL, INS, Q
    profile >> HEAD
    ARCHIVE attribute on APPLET ; warning, it contains a list of URIs.

    Easier way of organizing the list:
    a:      href
    area:   href
    base:   href
    body:   background
    blockquote: cite (not normally rewritable)
    link:   href
    frame:  src, longdesc
    iframe: src, longdesc
    input:  src, usemap
    form:   action
    img:    src, longdesc, usemap
    script: src
    applet: codebase, archive <list>
    object: codebase, data, classid, usemap
    head:   profile
    del:    cite
    ins:    cite
    q:      cite
 */

#include "nsHTMLURIRefObject.h"

#include "mozilla/mozalloc.h"
#include "nsAString.h"
#include "nsDebug.h"
#include "nsError.h"
#include "nsID.h"
#include "nsIDOMAttr.h"
#include "nsIDOMElement.h"
#include "nsIDOMMozNamedAttrMap.h"
#include "nsIDOMNode.h"
#include "nsISupportsUtils.h"
#include "nsString.h"
#include "nsAutoPtr.h"

// String classes change too often and I can't keep up.
// Set this macro to this week's approved case-insensitive compare routine.
#define MATCHES(tagName, str) tagName.EqualsIgnoreCase(str)

nsHTMLURIRefObject::nsHTMLURIRefObject()
{
  mCurAttrIndex = mAttributeCnt = 0;
}

nsHTMLURIRefObject::~nsHTMLURIRefObject()
{
}

//Interfaces for addref and release and queryinterface
NS_IMPL_ISUPPORTS(nsHTMLURIRefObject, nsIURIRefObject)

NS_IMETHODIMP
nsHTMLURIRefObject::Reset()
{
  mCurAttrIndex = 0;
  return NS_OK;
}

NS_IMETHODIMP
nsHTMLURIRefObject::GetNextURI(nsAString & aURI)
{
  NS_ENSURE_TRUE(mNode, NS_ERROR_NOT_INITIALIZED);

  nsAutoString tagName;
  nsresult rv = mNode->GetNodeName(tagName);
  NS_ENSURE_SUCCESS(rv, rv);

  // Loop over attribute list:
  if (!mAttributes)
  {
    nsCOMPtr<nsIDOMElement> element (do_QueryInterface(mNode));
    NS_ENSURE_TRUE(element, NS_ERROR_INVALID_ARG);

    mCurAttrIndex = 0;
    element->GetAttributes(getter_AddRefs(mAttributes));
    NS_ENSURE_TRUE(mAttributes, NS_ERROR_NOT_INITIALIZED);

    rv = mAttributes->GetLength(&mAttributeCnt);
    NS_ENSURE_SUCCESS(rv, rv);
    NS_ENSURE_TRUE(mAttributeCnt, NS_ERROR_FAILURE);
    mCurAttrIndex = 0;
  }

  while (mCurAttrIndex < mAttributeCnt)
  {
    nsCOMPtr<nsIDOMAttr> attrNode;
    rv = mAttributes->Item(mCurAttrIndex++, getter_AddRefs(attrNode));
    NS_ENSURE_SUCCESS(rv, rv);
    NS_ENSURE_ARG_POINTER(attrNode);
    nsString curAttr;
    rv = attrNode->GetName(curAttr);
    NS_ENSURE_SUCCESS(rv, rv);

    // href >> A, AREA, BASE, LINK
    if (MATCHES(curAttr, "href"))
    {
      if (!MATCHES(tagName, "a") && !MATCHES(tagName, "area")
          && !MATCHES(tagName, "base") && !MATCHES(tagName, "link"))
        continue;
      rv = attrNode->GetValue(aURI);
      NS_ENSURE_SUCCESS(rv, rv);
      nsString uri (aURI);
      // href pointing to a named anchor doesn't count
      if (aURI.First() != char16_t('#'))
        return NS_OK;
      aURI.Truncate();
      return NS_ERROR_INVALID_ARG;
    }
    // src >> FRAME, IFRAME, IMG, INPUT, SCRIPT
    else if (MATCHES(curAttr, "src"))
    {
      if (!MATCHES(tagName, "img")
          && !MATCHES(tagName, "frame") && !MATCHES(tagName, "iframe")
          && !MATCHES(tagName, "input") && !MATCHES(tagName, "script"))
        continue;
      return attrNode->GetValue(aURI);
    }
    //<META http-equiv="refresh" content="3,http://www.acme.com/intro.html">
    else if (MATCHES(curAttr, "content"))
    {
      if (!MATCHES(tagName, "meta"))
        continue;
    }
    // longdesc >> FRAME, IFRAME, IMG
    else if (MATCHES(curAttr, "longdesc"))
    {
      if (!MATCHES(tagName, "img")
          && !MATCHES(tagName, "frame") && !MATCHES(tagName, "iframe"))
        continue;
    }
    // usemap >> IMG, INPUT, OBJECT
    else if (MATCHES(curAttr, "usemap"))
    {
      if (!MATCHES(tagName, "img")
          && !MATCHES(tagName, "input") && !MATCHES(tagName, "object"))
        continue;
    }
    // action >> FORM
    else if (MATCHES(curAttr, "action"))
    {
      if (!MATCHES(tagName, "form"))
        continue;
    }
    // background >> BODY
    else if (MATCHES(curAttr, "background"))
    {
      if (!MATCHES(tagName, "body"))
        continue;
    }
    // codebase >> OBJECT, APPLET
    else if (MATCHES(curAttr, "codebase"))
    {
      if (!MATCHES(tagName, "meta"))
        continue;
    }
    // classid >> OBJECT
    else if (MATCHES(curAttr, "classid"))
    {
      if (!MATCHES(tagName, "object"))
        continue;
    }
    // data >> OBJECT
    else if (MATCHES(curAttr, "data"))
    {
      if (!MATCHES(tagName, "object"))
        continue;
    }
    // cite >> BLOCKQUOTE, DEL, INS, Q
    else if (MATCHES(curAttr, "cite"))
    {
      if (!MATCHES(tagName, "blockquote") && !MATCHES(tagName, "q")
          && !MATCHES(tagName, "del") && !MATCHES(tagName, "ins"))
        continue;
    }
    // profile >> HEAD
    else if (MATCHES(curAttr, "profile"))
    {
      if (!MATCHES(tagName, "head"))
        continue;
    }
    // archive attribute on APPLET; warning, it contains a list of URIs.
    else if (MATCHES(curAttr, "archive"))
    {
      if (!MATCHES(tagName, "applet"))
        continue;
    }
  }
  // Return a code to indicate that there are no more,
  // to distinguish that case from real errors.
  return NS_ERROR_NOT_AVAILABLE;
}

NS_IMETHODIMP
nsHTMLURIRefObject::RewriteAllURIs(const nsAString & aOldPat,
                            const nsAString & aNewPat,
                            bool aMakeRel)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
nsHTMLURIRefObject::GetNode(nsIDOMNode** aNode)
{
  NS_ENSURE_TRUE(mNode, NS_ERROR_NOT_INITIALIZED);
  NS_ENSURE_TRUE(aNode, NS_ERROR_NULL_POINTER);
  *aNode = mNode.get();
  NS_ADDREF(*aNode);
  return NS_OK;
}

NS_IMETHODIMP
nsHTMLURIRefObject::SetNode(nsIDOMNode *aNode)
{
  mNode = aNode;
  nsAutoString dummyURI;
  if (NS_SUCCEEDED(GetNextURI(dummyURI)))
  {
    mCurAttrIndex = 0;    // Reset so we'll get the first node next time
    return NS_OK;
  }

  // If there weren't any URIs in the attributes,
  // then don't accept this node.
  mNode = 0;
  return NS_ERROR_INVALID_ARG;
}

nsresult NS_NewHTMLURIRefObject(nsIURIRefObject** aResult, nsIDOMNode* aNode)
{
  nsRefPtr<nsHTMLURIRefObject> refObject = new nsHTMLURIRefObject();
  nsresult rv = refObject->SetNode(aNode);
  if (NS_FAILED(rv)) {
    *aResult = 0;
    return rv;
  }
  refObject.forget(aResult);
  return NS_OK;
}