/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla 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/MPL/
 *
 * 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.org 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 MPL, 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 MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#ifndef nsXMLHttpRequest_h__
#define nsXMLHttpRequest_h__

#include "nsIXMLHttpRequest.h"
#include "nsISupportsUtils.h"
#include "nsCOMPtr.h"
#include "nsString.h"
#include "nsIDOMLoadListener.h"
#include "nsIDOMEventTarget.h"
#include "nsIDOMNSEventTarget.h"
#include "nsIDOMDocument.h"
#include "nsIURI.h"
#include "nsIHttpChannel.h"
#include "nsIDocument.h"
#include "nsIStreamListener.h"
#include "nsWeakReference.h"
#include "jsapi.h"
#include "nsIScriptContext.h"
#include "nsIChannelEventSink.h"
#include "nsIInterfaceRequestor.h"
#include "nsIHttpHeaderVisitor.h"
#include "nsIProgressEventSink.h"
#include "nsCOMArray.h"
#include "nsJSUtils.h"
#include "nsTArray.h"
#include "nsCycleCollectionParticipant.h"
#include "nsIJSNativeInitializer.h"
#include "nsPIDOMWindow.h"
#include "nsIDOMLSProgressEvent.h"
#include "nsClassHashtable.h"
#include "nsHashKeys.h"
#include "prclist.h"
#include "prtime.h"
#include "nsIEventListenerManager.h"
#include "nsIDOMNSEvent.h"
#include "nsIPrivateDOMEvent.h"
#include "nsDOMProgressEvent.h"

class nsILoadGroup;

class nsDOMEventListenerWrapper : public nsIDOMEventListener
{
public:
  nsDOMEventListenerWrapper(nsIDOMEventListener* aListener)
  : mListener(aListener) {}

  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
  NS_DECL_CYCLE_COLLECTION_CLASS(nsDOMEventListenerWrapper)

  NS_DECL_NSIDOMEVENTLISTENER

  nsIDOMEventListener* GetInner() { return mListener; }
protected:
  nsCOMPtr<nsIDOMEventListener> mListener;
};

class nsXHREventTarget : public nsIXMLHttpRequestEventTarget,
                         public nsPIDOMEventTarget,
                         public nsIDOMNSEventTarget
{
public:
  nsXHREventTarget() : mLang(nsIProgrammingLanguage::JAVASCRIPT) {}
  virtual ~nsXHREventTarget() {}
  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
  NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(nsXHREventTarget,
                                           nsIXMLHttpRequestEventTarget)
  NS_DECL_NSIDOMNSEVENTTARGET
  NS_DECL_NSIXMLHTTPREQUESTEVENTTARGET
  NS_DECL_NSIDOMEVENTTARGET
  // nsPIDOMEventTarget
  virtual nsresult PreHandleEvent(nsEventChainPreVisitor& aVisitor);
  virtual nsresult PostHandleEvent(nsEventChainPostVisitor& aVisitor);
  virtual nsresult DispatchDOMEvent(nsEvent* aEvent, nsIDOMEvent* aDOMEvent,
                                    nsPresContext* aPresContext,
                                    nsEventStatus* aEventStatus);
  virtual nsresult GetListenerManager(PRBool aCreateIfNotFound,
                                      nsIEventListenerManager** aResult);
  virtual nsresult AddEventListenerByIID(nsIDOMEventListener *aListener,
                                         const nsIID& aIID);
  virtual nsresult RemoveEventListenerByIID(nsIDOMEventListener *aListener,
                                            const nsIID& aIID);
  virtual nsresult GetSystemEventGroup(nsIDOMEventGroup** aGroup);
  virtual nsresult GetContextForEventHandlers(nsIScriptContext** aContext) = 0;

  PRBool HasListenersFor(const nsAString& aType)
  {
    return mListenerManager && mListenerManager->HasListenersFor(aType);
  }
  nsresult RemoveAddEventListener(const nsAString& aType,
                                  nsRefPtr<nsDOMEventListenerWrapper>& aCurrent,
                                  nsIDOMEventListener* aNew);

  nsresult GetInnerEventListener(nsRefPtr<nsDOMEventListenerWrapper>& aWrapper,
                                 nsIDOMEventListener** aListener);
protected:
  nsRefPtr<nsDOMEventListenerWrapper> mOnLoadListener;
  nsRefPtr<nsDOMEventListenerWrapper> mOnErrorListener;
  nsRefPtr<nsDOMEventListenerWrapper> mOnAbortListener;
  nsRefPtr<nsDOMEventListenerWrapper> mOnLoadStartListener;
  nsRefPtr<nsDOMEventListenerWrapper> mOnProgressListener;
  nsCOMPtr<nsIEventListenerManager> mListenerManager;
  PRUint32 mLang;
};

class nsXMLHttpRequestUpload : public nsXHREventTarget,
                               public nsIXMLHttpRequestUpload
{
public:
  nsXMLHttpRequestUpload(nsPIDOMEventTarget* aOwner) : mOwner(aOwner) {}
  NS_DECL_ISUPPORTS_INHERITED
  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(nsXMLHttpRequestUpload,
                                           nsXHREventTarget)
  NS_FORWARD_NSIXMLHTTPREQUESTEVENTTARGET(nsXHREventTarget::)
  NS_FORWARD_NSIDOMEVENTTARGET(nsXHREventTarget::)
  NS_FORWARD_NSIDOMNSEVENTTARGET(nsXHREventTarget::)
  NS_DECL_NSIXMLHTTPREQUESTUPLOAD
  virtual nsresult GetContextForEventHandlers(nsIScriptContext** aContext);
protected:
  nsCOMPtr<nsPIDOMEventTarget> mOwner;
};

class nsXMLHttpRequest : public nsXHREventTarget,
                         public nsIXMLHttpRequest,
                         public nsIJSXMLHttpRequest,
                         public nsIDOMLoadListener,
                         public nsIStreamListener,
                         public nsIChannelEventSink,
                         public nsIProgressEventSink,
                         public nsIInterfaceRequestor,
                         public nsSupportsWeakReference,
                         public nsIJSNativeInitializer,
                         public nsIXMLHttpRequestUploadGetter
{
public:
  nsXMLHttpRequest();
  virtual ~nsXMLHttpRequest();

  NS_DECL_ISUPPORTS_INHERITED

  // nsIXMLHttpRequest
  NS_DECL_NSIXMLHTTPREQUEST

  // nsIJSXMLHttpRequest
  NS_IMETHOD GetOnuploadprogress(nsIDOMEventListener** aOnuploadprogress);
  NS_IMETHOD SetOnuploadprogress(nsIDOMEventListener* aOnuploadprogress);
  NS_IMETHOD GetOnreadystatechange(nsIDOMEventListener** aOnreadystatechange);
  NS_IMETHOD SetOnreadystatechange(nsIDOMEventListener* aOnreadystatechange);

  NS_FORWARD_NSIXMLHTTPREQUESTEVENTTARGET(nsXHREventTarget::)

  // nsIDOMEventListener
  NS_DECL_NSIDOMEVENTLISTENER

  // nsIXMLHttpRequestUploadGetter
  NS_DECL_NSIXMLHTTPREQUESTUPLOADGETTER

  // nsIDOMLoadListener
  NS_IMETHOD Load(nsIDOMEvent* aEvent);
  NS_IMETHOD BeforeUnload(nsIDOMEvent* aEvent);
  NS_IMETHOD Unload(nsIDOMEvent* aEvent);
  NS_IMETHOD Abort(nsIDOMEvent* aEvent);
  NS_IMETHOD Error(nsIDOMEvent* aEvent);

  // nsIStreamListener
  NS_DECL_NSISTREAMLISTENER

  // nsIRequestObserver
  NS_DECL_NSIREQUESTOBSERVER

  // nsIChannelEventSink
  NS_DECL_NSICHANNELEVENTSINK

  // nsIProgressEventSink
  NS_DECL_NSIPROGRESSEVENTSINK

  // nsIInterfaceRequestor
  NS_DECL_NSIINTERFACEREQUESTOR

  // nsIJSNativeInitializer
  NS_IMETHOD Initialize(nsISupports* aOwner, JSContext* cx, JSObject* obj,
                       PRUint32 argc, jsval* argv);

  virtual nsresult GetContextForEventHandlers(nsIScriptContext** aContext);


  // This creates a trusted readystatechange event, which is not cancelable and
  // doesn't bubble.
  static nsresult CreateReadystatechangeEvent(nsIDOMEvent** aDOMEvent);
  // For backwards compatibility aPosition should contain the headers for upload
  // and aTotalSize is LL_MAXUINT when unknown. Both those values are
  // used by nsXMLHttpProgressEvent. Normal progress event should not use
  // headers in aLoaded and aTotal is 0 when unknown.
  static void DispatchProgressEvent(nsPIDOMEventTarget* aTarget,
                                    const nsAString& aType,
                                    // Whether to use nsXMLHttpProgressEvent,
                                    // which implements LS Progress Event.
                                    PRBool aUseLSEventWrapper,
                                    PRBool aLengthComputable,
                                    // For Progress Events
                                    PRUint64 aLoaded, PRUint64 aTotal,
                                    // For LS Progress Events
                                    PRUint64 aPosition, PRUint64 aTotalSize);
  static void DispatchProgressEvent(nsPIDOMEventTarget* aTarget,
                                    const nsAString& aType,
                                    PRBool aLengthComputable,
                                    PRUint64 aLoaded, PRUint64 aTotal)
  {
    DispatchProgressEvent(aTarget, aType, PR_FALSE,
                          aLengthComputable, aLoaded, aTotal,
                          aLoaded, aLengthComputable ? aTotal : LL_MAXUINT);
  }

  // This is called by the factory constructor.
  nsresult Init();

  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(nsXMLHttpRequest,
                                           nsXHREventTarget)

protected:
  nsresult DetectCharset(nsACString& aCharset);
  nsresult ConvertBodyToText(nsAString& aOutBuffer);
  static NS_METHOD StreamReaderFunc(nsIInputStream* in,
                void* closure,
                const char* fromRawSegment,
                PRUint32 toOffset,
                PRUint32 count,
                PRUint32 *writeCount);
  // Change the state of the object with this. The broadcast argument
  // determines if the onreadystatechange listener should be called.
  nsresult ChangeState(PRUint32 aState, PRBool aBroadcast = PR_TRUE);
  nsresult RequestCompleted();
  nsresult GetLoadGroup(nsILoadGroup **aLoadGroup);
  nsIURI *GetBaseURI();

  nsresult RemoveAddEventListener(const nsAString& aType,
                                  nsRefPtr<nsDOMEventListenerWrapper>& aCurrent,
                                  nsIDOMEventListener* aNew);

  nsresult GetInnerEventListener(nsRefPtr<nsDOMEventListenerWrapper>& aWrapper,
                                 nsIDOMEventListener** aListener);

  already_AddRefed<nsIHttpChannel> GetCurrentHttpChannel();

  /**
   * Check if mChannel is ok for a cross-site request by making sure no
   * inappropriate headers are set, and no username/password is set.
   *
   * Also updates the XML_HTTP_REQUEST_USE_XSITE_AC bit.
   */
  nsresult CheckChannelForCrossSiteRequest();

  nsresult CheckInnerWindowCorrectness()
  {
    if (mOwner) {
      NS_ASSERTION(mOwner->IsInnerWindow(), "Should have inner window here!\n");
      nsPIDOMWindow* outer = mOwner->GetOuterWindow();
      if (!outer || outer->GetCurrentInnerWindow() != mOwner) {
        return NS_ERROR_FAILURE;
      }
    }
    return NS_OK;
  }

  nsCOMPtr<nsISupports> mContext;
  nsCOMPtr<nsIPrincipal> mPrincipal;
  nsCOMPtr<nsIChannel> mChannel;
  // mReadRequest is different from mChannel for multipart requests
  nsCOMPtr<nsIRequest> mReadRequest;
  nsCOMPtr<nsIDOMDocument> mDocument;

  // These may be null (native callers or xpcshell).
  nsCOMPtr<nsIScriptContext> mScriptContext;
  nsCOMPtr<nsPIDOMWindow>    mOwner; // Inner window.

  nsRefPtr<nsDOMEventListenerWrapper> mOnUploadProgressListener;
  nsRefPtr<nsDOMEventListenerWrapper> mOnReadystatechangeListener;

  nsCOMPtr<nsIStreamListener> mXMLParserStreamListener;

  // used to implement getAllResponseHeaders()
  class nsHeaderVisitor : public nsIHttpHeaderVisitor {
  public:
    NS_DECL_ISUPPORTS
    NS_DECL_NSIHTTPHEADERVISITOR
    nsHeaderVisitor() { }
    virtual ~nsHeaderVisitor() {}
    const nsACString &Headers() { return mHeaders; }
  private:
    nsCString mHeaders;
  };

  nsCString mResponseBody;

  nsCString mOverrideMimeType;

  /**
   * The notification callbacks the channel had when Send() was
   * called.  We want to forward things here as needed.
   */
  nsCOMPtr<nsIInterfaceRequestor> mNotificationCallbacks;
  /**
   * Sink interfaces that we implement that mNotificationCallbacks may
   * want to also be notified for.  These are inited lazily if we're
   * asked for the relevant interface.
   */
  nsCOMPtr<nsIChannelEventSink> mChannelEventSink;
  nsCOMPtr<nsIProgressEventSink> mProgressEventSink;

  PRUint32 mState;

  // List of potentially dangerous headers explicitly set using
  // SetRequestHeader.
  nsTArray<nsCString> mExtraRequestHeaders;

  nsRefPtr<nsXMLHttpRequestUpload> mUpload;
  PRUint32 mUploadTransferred;
  PRUint32 mUploadTotal;
  PRPackedBool mUploadComplete;

  PRPackedBool mErrorLoad;
};

// helper class to expose a progress DOM Event

class nsXMLHttpProgressEvent : public nsIDOMProgressEvent,
                               public nsIDOMLSProgressEvent,
                               public nsIDOMNSEvent,
                               public nsIPrivateDOMEvent
{
public:
  nsXMLHttpProgressEvent(nsIDOMProgressEvent* aInner,
                         PRUint64 aCurrentProgress,
                         PRUint64 aMaxProgress);
  virtual ~nsXMLHttpProgressEvent();

  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
  NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(nsXMLHttpProgressEvent, nsIDOMNSEvent)
  NS_FORWARD_NSIDOMEVENT(mInner->)
  NS_FORWARD_NSIDOMNSEVENT(mInner->)
  NS_FORWARD_NSIDOMPROGRESSEVENT(mInner->)
  NS_DECL_NSIDOMLSPROGRESSEVENT
  // nsPrivateDOMEvent
  NS_IMETHOD DuplicatePrivateData()
  {
    return mInner->DuplicatePrivateData();
  }
  NS_IMETHOD SetTarget(nsIDOMEventTarget* aTarget)
  {
    return mInner->SetTarget(aTarget);
  }
  NS_IMETHOD SetCurrentTarget(nsIDOMEventTarget* aTarget)
  {
    return mInner->SetCurrentTarget(aTarget);
  }
  NS_IMETHOD SetOriginalTarget(nsIDOMEventTarget* aTarget)
  {
    return mInner->SetOriginalTarget(aTarget);
  }
  NS_IMETHOD IsDispatchStopped(PRBool* aIsDispatchPrevented)
  {
    return mInner->IsDispatchStopped(aIsDispatchPrevented);
  }
  NS_IMETHOD GetInternalNSEvent(nsEvent** aNSEvent)
  {
    return mInner->GetInternalNSEvent(aNSEvent);
  }
  NS_IMETHOD HasOriginalTarget(PRBool* aResult)
  {
    return mInner->HasOriginalTarget(aResult);
  }
  NS_IMETHOD SetTrusted(PRBool aTrusted)
  {
    return mInner->SetTrusted(aTrusted);
  }

protected:
  // Use nsDOMProgressEvent so that we can forward
  // most of the method calls easily.
  nsRefPtr<nsDOMProgressEvent> mInner;
  PRUint64 mCurProgress;
  PRUint64 mMaxProgress;
};

#endif
