/* -*- Mode: C++; tab-width: 3; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * 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 the Mozilla browser.
 * 
 * The Initial Developer of the Original Code is Netscape
 * Communications, Inc.  Portions created by Netscape are
 * Copyright (C) 1999, Mozilla.  All Rights Reserved.
 * 
 * Contributor(s):
 *   Scott MacGregor <mscott@netscape.com>
 */

#ifndef nsOSHelperAppService_h__
#define nsOSHelperAppService_h__

// The OS helper app service is a subclass of nsExternalHelperAppService and is implemented on each
// platform. It contains platform specific code for finding helper applications for a given mime type
// in addition to launching those applications.

#include "nsExternalHelperAppService.h"
#include "nsCExternalHandlerService.h"
#include "nsCOMPtr.h"

class nsHashtable;
class nsILineInputStream;

class nsOSHelperAppService : public nsExternalHelperAppService
{
public:
  nsOSHelperAppService();
  virtual ~nsOSHelperAppService();

  // method overrides for mime.types and mime.info look up steps
  already_AddRefed<nsIMIMEInfo> GetMIMEInfoFromOS(const char *aMimeType,
                                                  const char *aFileExt,
                                                  PRBool     *aFound);

  // override nsIExternalProtocolService methods
  NS_IMETHOD ExternalProtocolHandlerExists(const char * aProtocolScheme, PRBool * aHandlerExists);
  nsresult   LoadUriInternal(nsIURI * aURL);

  // GetFileTokenForPath must be implemented by each platform. 
  // platformAppPath --> a platform specific path to an application that we got out of the 
  //                     rdf data source. This can be a mac file spec, a unix path or a windows path depending on the platform
  // aFile --> an nsIFile representation of that platform application path.
  virtual nsresult GetFileTokenForPath(const PRUnichar * platformAppPath, nsIFile ** aFile);
  
protected:
  already_AddRefed<nsMIMEInfoBase> GetFromType(const char *aMimeType);
  already_AddRefed<nsMIMEInfoBase> GetFromExtension(const char *aFileExt);

  virtual void FixFilePermissions(nsILocalFile* aFile);
private:
  PRUint32 mPermissions;

  // Helper methods which have to access static members
  static nsresult UnescapeCommand(const nsAString& aEscapedCommand,
                                  const nsAString& aMajorType,
                                  const nsAString& aMinorType,
                                  nsHashtable& aTypeOptions,
                                  nsACString& aUnEscapedCommand);
  static nsresult GetFileLocation(const char* aPrefName,
                                  const char* aEnvVarName,
                                  PRUnichar** aFileLocation);
  static nsresult LookUpTypeAndDescription(const nsAString& aFileExtension,
                                           nsAString& aMajorType,
                                           nsAString& aMinorType,
                                           nsAString& aDescription,
                                           PRBool aUserData);
  static nsresult CreateInputStream(const nsAString& aFilename,
                                    nsIFileInputStream ** aFileInputStream,
                                    nsILineInputStream ** aLineInputStream,
                                    nsACString& aBuffer,
                                    PRBool * aNetscapeFormat,
                                    PRBool * aMore);

  static nsresult GetTypeAndDescriptionFromMimetypesFile(const nsAString& aFilename,
                                                         const nsAString& aFileExtension,
                                                         nsAString& aMajorType,
                                                         nsAString& aMinorType,
                                                         nsAString& aDescription);

  static nsresult LookUpExtensionsAndDescription(const nsAString& aMajorType,
                                                 const nsAString& aMinorType,
                                                 nsAString& aFileExtensions,
                                                 nsAString& aDescription);

  static nsresult GetExtensionsAndDescriptionFromMimetypesFile(const nsAString& aFilename,
                                                               const nsAString& aMajorType,
                                                               const nsAString& aMinorType,
                                                               nsAString& aFileExtensions,
                                                               nsAString& aDescription);

  static nsresult ParseNetscapeMIMETypesEntry(const nsAString& aEntry,
                                              nsAString::const_iterator& aMajorTypeStart,
                                              nsAString::const_iterator& aMajorTypeEnd,
                                              nsAString::const_iterator& aMinorTypeStart,
                                              nsAString::const_iterator& aMinorTypeEnd,
                                              nsAString& aExtensions,
                                              nsAString::const_iterator& aDescriptionStart,
                                              nsAString::const_iterator& aDescriptionEnd);

  static nsresult ParseNormalMIMETypesEntry(const nsAString& aEntry,
                                            nsAString::const_iterator& aMajorTypeStart,
                                            nsAString::const_iterator& aMajorTypeEnd,
                                            nsAString::const_iterator& aMinorTypeStart,
                                            nsAString::const_iterator& aMinorTypeEnd,
                                            nsAString& aExtensions,
                                            nsAString::const_iterator& aDescriptionStart,
                                            nsAString::const_iterator& aDescriptionEnd);

  static nsresult LookUpHandlerAndDescription(const nsAString& aMajorType,
                                              const nsAString& aMinorType,
                                              nsHashtable& aTypeOptions,
                                              nsAString& aHandler,
                                              nsAString& aDescription,
                                              nsAString& aMozillaFlags);
  
  static nsresult DoLookUpHandlerAndDescription(const nsAString& aMajorType,
                                                const nsAString& aMinorType,
                                                nsHashtable& aTypeOptions,
                                                nsAString& aHandler,
                                                nsAString& aDescription,
                                                nsAString& aMozillaFlags,
                                                PRBool aUserData);
  
  static nsresult GetHandlerAndDescriptionFromMailcapFile(const nsAString& aFilename,
                                                          const nsAString& aMajorType,
                                                          const nsAString& aMinorType,
                                                          nsHashtable& aTypeOptions,
                                                          nsAString& aHandler,
                                                          nsAString& aDescription,
                                                          nsAString& aMozillaFlags);

  nsresult GetHandlerAppFromPrefs(const char* aScheme, nsIFile** aApp);
};

#endif // nsOSHelperAppService_h__