/*

Copyright (c) 2014, Inverse inc.
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
    * Neither the name of the Inverse inc. nor the
      names of its contributors may be used to endorse or promote products
      derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/
#include "SOGoMailObject+ActiveSync.h"

#import <Foundation/NSArray.h>
#import <Foundation/NSCalendarDate.h>
#import <Foundation/NSDictionary.h>
#import <Foundation/NSException.h>
#import <Foundation/NSString.h>

#import <NGCards/iCalCalendar.h>
#import <NGCards/iCalDateTime.h>
#import <NGCards/iCalEvent.h>
#import <NGCards/iCalPerson.h>
#import <NGCards/iCalTimeZone.h>

#import <NGExtensions/NGBase64Coding.h>
#import <NGExtensions/NGQuotedPrintableCoding.h>
#import <NGExtensions/NSString+misc.h>
#import <NGExtensions/NSString+Encoding.h>
#import <NGImap4/NGImap4Envelope.h>
#import <NGImap4/NGImap4EnvelopeAddress.h>
#import <NGImap4/NSString+Imap4.h>
#import <NGObjWeb/WOContext+SoObjects.h>
#import <NGObjWeb/WOApplication.h>

#import <NGMime/NGMimeBodyPart.h>
#import <NGMime/NGMimeFileData.h>
#import <NGMime/NGMimeMultipartBody.h>
#import <NGMime/NGMimeType.h>
#import <NGMail/NGMimeMessageParser.h>
#import <NGMail/NGMimeMessage.h>
#import <NGMail/NGMimeMessageGenerator.h>

#import <Mailer/SOGoMailLabel.h>

#import <SOGo/SOGoUserDefaults.h>

#include "iCalTimeZone+ActiveSync.h"
#include "NSData+ActiveSync.h"
#include "NSDate+ActiveSync.h"
#include "NSString+ActiveSync.h"

#include <Appointments/iCalEntityObject+SOGo.h>
#include <Appointments/iCalPerson+SOGo.h>
#include <Mailer/NSString+Mail.h>
#include <Mailer/SOGoMailBodyPart.h>
#include <SOGo/SOGoUser.h>
#include <SOGo/NSString+Utilities.h>

#import <Appointments/SOGoAptMailNotification.h>

unsigned char strToChar(char a, char b) {
    char encoder[3] = {'\0','\0','\0'};
    encoder[0] = a;
    encoder[1] = b;
    return (char) strtol(encoder,NULL,16);
}

@interface NSString (NSStringExtensions)
- (NSData *) decodeFromHexidecimal;
@end

@implementation NSString (NSStringExtensions)

- (NSData *) decodeFromHexidecimal;
{
    const char * bytes = [self cStringUsingEncoding: NSUTF8StringEncoding];
    NSUInteger length = strlen(bytes);
    unsigned char * r = (unsigned char *) malloc(length / 2 + 1);
    unsigned char * index = r;

    while ((*bytes) && (*(bytes +1))) {
        *index = strToChar(*bytes, *(bytes +1));
        index++;
        bytes+=2;
    }
    *index = '\0';

    NSData * result = [NSData dataWithBytes: r length: length / 2];
    free(r);

    return result;
}

@end

typedef struct {
  uint32_t dwLowDateTime;
  uint32_t dwHighDateTime;
} FILETIME;

struct GlobalObjectId {
  uint8_t                   ByteArrayID[16];
  uint8_t                   YH;
  uint8_t                   YL;
  uint8_t                   Month;
  uint8_t                   D;
  FILETIME                  CreationTime;
  uint8_t                   X[8];
  uint32_t                  Size;
  uint8_t Data[0];
};

@implementation SOGoMailObject (ActiveSync)

//
//
//
- (void) _setInstanceDate: (struct GlobalObjectId *) newGlobalId
                 fromDate: (NSCalendarDate *) instanceDate
{
  uint16_t year;

  if (instanceDate)
    {
      //[instanceDate setTimeZone: timeZone];
      year = [instanceDate yearOfCommonEra];
      newGlobalId->YH = year >> 8;
      newGlobalId->YL = year & 0xff;
      newGlobalId->Month = [instanceDate monthOfYear];
      newGlobalId->D = [instanceDate dayOfMonth];
    }
}

//
// The GlobalObjId is documented here: http://msdn.microsoft.com/en-us/library/ee160198(v=EXCHG.80).aspx
//

- (NSData *) _computeGlobalObjectIdFromEvent: (iCalEvent *) event
{
  NSData *binPrefix, *globalObjectId, *uidAsASCII;
  NSString *prefix, *uid;
  struct GlobalObjectId *newGlobalId;
  const char *bytes;

  uid = [event uid];
  uidAsASCII = [uid decodeFromHexidecimal];
  newGlobalId = (struct GlobalObjectId*)calloc(sizeof(uint8_t), sizeof(struct GlobalObjectId) + 0x0c + [uidAsASCII length]);

  prefix = @"040000008200e00074c5b7101a82e008";

  // dataPrefix is "vCal-Uid %x01 %x00 %x00 %x00"
  uint8_t dataPrefix[] = { 0x76, 0x43, 0x61, 0x6c, 0x2d, 0x55, 0x69, 0x64, 0x01, 0x00, 0x00, 0x00 };

  binPrefix = [prefix convertHexStringToBytes];
  [binPrefix getBytes: &newGlobalId->ByteArrayID];
  [self _setInstanceDate: newGlobalId
                fromDate: [event recurrenceId]];
  bytes = [uidAsASCII bytes];

  // 0x0c is the size of our dataPrefix
  newGlobalId->Size = 0x0c + [uidAsASCII length];
  memcpy(newGlobalId->Data, dataPrefix, 0x0c);
  memcpy(newGlobalId->Data + 0x0c, bytes, newGlobalId->Size - 0x0c);

  globalObjectId = [[NSData alloc] initWithBytes: newGlobalId  length: 40 + newGlobalId->Size*sizeof(uint8_t)];
  free(newGlobalId);
  return [globalObjectId autorelease];
}


//
// For debugging purposes...
//
- (NSString *) _uidFromGlobalObjectId: (NSData *) objectId
{
  NSString *uid;

  struct GlobalObjectId *newGlobalId;
  NSUInteger length;
  uint8_t *bytes;

  length = [objectId length];
  uid = nil;

  bytes = malloc(length*sizeof(uint8_t));
  [objectId getBytes: bytes  length: length];

  newGlobalId = (struct GlobalObjectId *)bytes;

  // We must take the offset (dataPrefix) into account
  uid = [[NSString alloc] initWithBytes: newGlobalId->Data+12  length: newGlobalId->Size-12 encoding: NSASCIIStringEncoding];
  free(bytes);

  return AUTORELEASE(uid);
}

//
//
//
- (NSString *) _emailAddressesFrom: (NSArray *) enveloppeAddresses
{
  NGImap4EnvelopeAddress *address;
  NSString *email, *rc, *name;
  NSMutableArray *addresses;
  int i, max;

  rc = nil;
  max = [enveloppeAddresses count];

  if (max > 0)
    {
      addresses = [NSMutableArray array];
      for (i = 0; i < max; i++)
        {
          address = [enveloppeAddresses objectAtIndex: i];
          name = [address personalName];
          email = [NSString stringWithFormat: @"\"%@\" <%@>", (name ? name : [address baseEMail]), [address baseEMail]];
          
          if (email)
            [addresses addObject: email];
        }
      rc = [addresses componentsJoinedByString: @", "];
    }

  return rc;
}

//
//
//
- (NSData *) _preferredBodyDataInMultipartUsingType: (int) theType
                                    nativeTypeFound: (int *) theNativeTypeFound
{
  NSString *encoding, *key, *plainKey, *htmlKey, *type, *subtype;
  NSDictionary *textParts, *part;
  NSEnumerator *e;
  NSData *d;

  BOOL ignore;

  textParts = [self fetchPlainTextParts];
  e = [textParts keyEnumerator];
  plainKey = nil;
  htmlKey = nil;
  d = nil;

  while ((key = [e nextObject]))
    {
      // Walk the hierarchy up and check whether parents are of type mulipart - i.e. ignore message/rfc822
      if ([key countOccurrencesOfString: @"."] > 0)
        {
          NSMutableArray *a;

          a = [[[key componentsSeparatedByString: @"."] mutableCopy] autorelease];
          ignore = NO;

          while ([a count] > 0)
            {
              [a removeLastObject];
              part = [self lookupInfoForBodyPart: [a componentsJoinedByString: @"."]];

              if (![[part valueForKey: @"type"] isEqualToString: @"multipart"])
                ignore = YES;
            }

          if (ignore)
            continue;
        }

      part = [self lookupInfoForBodyPart: key];
      type = [part valueForKey: @"type"];
      subtype = [part valueForKey: @"subtype"];
      
      // Don't select an attachment as body
      if ([[[part valueForKey: @"disposition"] valueForKey: @"type"] isEqualToString: @"attachment"])
         continue;

      if ([type isEqualToString: @"text"] && [subtype isEqualToString: @"html"])
        htmlKey = key;
      else if ([type isEqualToString: @"text"] && [subtype isEqualToString: @"plain"])
        plainKey = key;
    }

  key = nil;
  *theNativeTypeFound = 1;

  if (theType == 2 && htmlKey)
    {
      key = htmlKey;
      *theNativeTypeFound = 2;
    }
  else if (theType == 1 && plainKey)
    key = plainKey;
  else if (theType == 2 && plainKey)
    key = plainKey;
  else if (theType == 1 && htmlKey)
    {
      key = htmlKey;
      *theNativeTypeFound = 2;
    }

  if (key)
    {
      NSString *s, *charset;
      
      d = [[self fetchPlainTextParts] objectForKey: key];

      encoding = [[self lookupInfoForBodyPart: key] objectForKey: @"encoding"];
      
      if ([encoding caseInsensitiveCompare: @"base64"] == NSOrderedSame)
        d = [d dataByDecodingBase64];
      else if ([encoding caseInsensitiveCompare: @"quoted-printable"] == NSOrderedSame)
        d = [d dataByDecodingQuotedPrintableTransferEncoding];

      charset = [[[self lookupInfoForBodyPart: key] objectForKey: @"parameterList"] objectForKey: @"charset"];

      if (![charset length])
        charset = @"utf-8";
      
      s = [NSString stringWithData: d  usingEncodingNamed: charset];

      // We fallback to ISO-8859-1 string encoding
      if (!s)
        s = [[[NSString alloc] initWithData: d  encoding: NSISOLatin1StringEncoding] autorelease];

      if (theType == 1 && *theNativeTypeFound == 2)
        s = [s htmlToText];

      d = [s dataUsingEncoding: NSUTF8StringEncoding];
    }

  return d;
}

//
//
//
- (void) _sanitizedMIMEPart: (id) thePart
                  performed: (BOOL *) b
{
  if ([thePart isKindOfClass: [NGMimeMultipartBody class]])
    {
      NGMimeBodyPart *part;
      NSArray *parts;
      int i;

      parts = [thePart parts];
      
      for (i = 0; i < [parts count]; i++)
        {
          part = [parts objectAtIndex: i];

          [self _sanitizedMIMEPart: part
                         performed: b];
        }
    }
  else if ([thePart isKindOfClass: [NGMimeBodyPart class]] || [thePart isKindOfClass: [NGMimeMessage class]])
    {
      NGMimeFileData *fdata;
      id body;

      body = [thePart body];

      if ([body isKindOfClass: [NGMimeMultipartBody class]])
        {
          [self _sanitizedMIMEPart: body
                         performed: b];
        }
      else if (([body isKindOfClass: [NSData class]] || [body isKindOfClass: [NSString class]]) &&
               [[[thePart contentType] type] isEqualToString: @"text"] &&
               ([[[thePart contentType] subType] isEqualToString: @"plain"] || [[[thePart contentType] subType] isEqualToString: @"html"]))
        {
          // We make sure everything is encoded in UTF-8.
          NGMimeType *mimeType;
          NSString *s;

          if ([body isKindOfClass: [NSData class]])
            {
              NSString *charset;
 
              charset = [[thePart contentType] valueOfParameter: @"charset"];

              if (![charset length])
                charset = @"utf-8";
              
              s = [NSString stringWithData: body usingEncodingNamed: charset];

              // We fallback to ISO-8859-1 string encoding. We avoid #3103.
              if (!s)
                s = [[[NSString alloc] initWithData: body  encoding: NSISOLatin1StringEncoding] autorelease];
            }
          else
            {
              // Handle situations when SOPE stupidly returns us a NSString
              // This can happen for Content-Type: text/plain, Content-Transfer-Encoding: 8bit
              s = body;
            }

          if (s)
            {
              body = [s dataUsingEncoding: NSUTF8StringEncoding];
            }

          mimeType = [NGMimeType mimeType: [[thePart contentType] type]
                                  subType: [[thePart contentType] subType]
                               parameters: [NSDictionary dictionaryWithObject: @"utf-8"  forKey: @"charset"]];
          [thePart setHeader: mimeType  forKey: @"content-type"];
          
          fdata = [[NGMimeFileData alloc] initWithBytes: [body bytes]
                                                 length: [body length]];
          
          [thePart setBody: fdata];                  
          RELEASE(fdata);
          *b = YES;
        }
    }
}

//
//
//
- (NSData *) _sanitizedMIMEMessage
{
  NGMimeMessageParser *parser;
  NGMimeMessage *message;
  NSData *d;
  
  BOOL b;
  
  d = [self content];

  parser = [[NGMimeMessageParser alloc] init];
  AUTORELEASE(parser);
  
  message = [parser parsePartFromData: d];
  b = NO;

  if (message)
    {
      [self _sanitizedMIMEPart: message  performed: &b];

      if (b)
        {
          NGMimeMessageGenerator *generator;
          
          generator = [[NGMimeMessageGenerator alloc] init];
          AUTORELEASE(generator);
          
          d = [generator generateMimeFromPart: message];
        }
    }
  
  return d;
}

//
//
//
- (NSData *) _preferredBodyDataUsingType: (int) theType
                              nativeType: (int *) theNativeType
{
  NSString *type, *subtype, *encoding;
  NSData *d;
  
  type = [[[self bodyStructure] valueForKey: @"type"] lowercaseString];
  subtype = [[[self bodyStructure] valueForKey: @"subtype"] lowercaseString];

  d = nil;
  
  // We determine the native type
  if ([type isEqualToString: @"text"] && [subtype isEqualToString: @"plain"])
    *theNativeType = 1;
  else if ([type isEqualToString: @"text"] && [subtype isEqualToString: @"html"])
    *theNativeType = 2;
  else if ([type isEqualToString: @"multipart"])
    *theNativeType = 4;

  // We get the right part based on the preference
  if (theType == 1 || theType == 2)
    {
      if ([type isEqualToString: @"text"] && ![subtype isEqualToString: @"calendar"])
        {
          NSString *s, *charset;
          
          charset = [[[self lookupInfoForBodyPart: @""] objectForKey: @"parameterList"] objectForKey: @"charset"];
          
          if (![charset length])
            charset = @"utf-8";
          
          d = [[self fetchPlainTextParts] objectForKey: @""];
          
          // We check if we have base64 encoded parts. If so, we just
          // un-encode them before using them
          encoding = [[self lookupInfoForBodyPart: @""] objectForKey: @"encoding"];

          if ([encoding caseInsensitiveCompare: @"base64"] == NSOrderedSame)
            d = [d dataByDecodingBase64];
          else if ([encoding caseInsensitiveCompare: @"quoted-printable"] == NSOrderedSame)
            d = [d dataByDecodingQuotedPrintableTransferEncoding];

          s = [NSString stringWithData: d  usingEncodingNamed: charset];

          // We fallback to ISO-8859-1 string encoding. We avoid #3103.
          if (!s)
            s = [[[NSString alloc] initWithData: d  encoding: NSISOLatin1StringEncoding] autorelease];
          
          // Check if we must convert html->plain
          if (theType == 1 && [subtype isEqualToString: @"html"])
            {
              s = [s htmlToText];
            }

          d = [s dataUsingEncoding: NSUTF8StringEncoding];
        }
      else if ([type isEqualToString: @"multipart"])
        {
          d = [self _preferredBodyDataInMultipartUsingType: theType nativeTypeFound: theNativeType];
        }
    }
  else if (theType == 4)
    {
      // We sanitize the content *ONLY* for Outlook clients and if the content-transfer-encoding is 8bit. Outlook has strange issues
      // with quoted-printable/base64 encoded text parts. It just doesn't decode them.
      encoding = [[self lookupInfoForBodyPart: @""] objectForKey: @"encoding"];
      if ([[context objectForKey: @"DeviceType"] isEqualToString: @"WindowsOutlook15"] || ([encoding caseInsensitiveCompare: @"8bit"] == NSOrderedSame))
        d = [self _sanitizedMIMEMessage];
      else
        d = [self content];
    }

  return d;
}


- (NSString *) _getNormalizedSubject
{
  NSString *subject;
  NSUInteger colIdx;
  NSString *stringValue;

  subject = [[self subject] decodedHeader];

  colIdx = [subject rangeOfString: @":" options:NSBackwardsSearch].location;
  if (colIdx != NSNotFound && colIdx + 1 < [subject length])
    stringValue = [[subject substringFromIndex: colIdx + 1] stringByTrimmingLeadSpaces];
  else
    stringValue = subject;

  if (!stringValue)
    stringValue = @"";

  return stringValue;
}


//
//
//
- (iCalCalendar *) calendarFromIMIPMessage
{
  NSDictionary *part;
  NSString *type, *subtype;
  NSArray *parts;
  int i;

  type = [[[self bodyStructure] valueForKey: @"type"] lowercaseString];
  subtype = [[[self bodyStructure] valueForKey: @"subtype"] lowercaseString];

  // process mail of type text/calendar
  if ([type isEqualToString: @"text"] && [subtype isEqualToString: @"calendar"])
    {
      iCalCalendar *calendar;
      NSString *encoding;
      NSData *calendarData;

      encoding = [[[self bodyStructure] valueForKey: @"encoding"] lowercaseString];
      calendarData = [[self fetchPlainTextParts] objectForKey: @""];

      if ([encoding caseInsensitiveCompare: @"base64"] == NSOrderedSame)
        calendarData = [calendarData dataByDecodingBase64];
      else if ([encoding caseInsensitiveCompare: @"quoted-printable"] == NSOrderedSame)
        calendarData = [calendarData dataByDecodingQuotedPrintableTransferEncoding];

      NS_DURING
        calendar = [iCalCalendar parseSingleFromSource: calendarData];
      NS_HANDLER
        calendar = nil;
      NS_ENDHANDLER

      return calendar;
    }

  // We check if we have at least 2 parts and if one of them is a text/calendar
  parts = [[self bodyStructure] objectForKey: @"parts"];

  if ([parts count] > 1)
    {
      for (i = 0; i < [parts count]; i++)
        {
          part = [parts objectAtIndex: i];
          
          if ([[part objectForKey: @"type"] isEqualToString: @"text"] &&
              [[part objectForKey: @"subtype"] isEqualToString: @"calendar"])
            {
              id bodyPart;

              bodyPart = [self lookupImap4BodyPartKey: [NSString stringWithFormat: @"%d", i+1]
                                            inContext: self->context];

              if (bodyPart)
                {
                  iCalCalendar *calendar;
                  NSData *calendarData;
                  
                  calendarData = [bodyPart fetchBLOB];
                  calendar = nil;

                  NS_DURING
                    calendar = [iCalCalendar parseSingleFromSource: calendarData];
                  NS_HANDLER
                    calendar = nil;
                  NS_ENDHANDLER

                  return calendar;
                }
            }
        }
    }

  return nil;
}

//
//
//
- (NSString *) activeSyncRepresentationInContext: (WOContext *) _context
{
  NSData *d, *globalObjId;
  NSArray *attachmentKeys;
  NSMutableString *s;

  uint32_t v;
  NSString *p;
  
  id value;

  iCalCalendar *calendar;
      
  int preferredBodyType, nativeBodyType;

  s = [NSMutableString string];

  // To - "The value of this element contains one or more e-mail addresses.
  // If there are multiple e-mail addresses, they are separated by commas."
  value = [self _emailAddressesFrom: [[self envelope] to]];
  if (value)
    [s appendFormat: @"<To xmlns=\"Email:\">%@</To>", [value activeSyncRepresentationInContext: context]];

  // From
  value = [self _emailAddressesFrom: [[self envelope] from]];
  if (value)
    [s appendFormat: @"<From xmlns=\"Email:\">%@</From>", [value activeSyncRepresentationInContext: context]];
  
  // Subject
  value = [self decodedSubject];
  if (value)
    {
      [s appendFormat: @"<Subject xmlns=\"Email:\">%@</Subject>", [value activeSyncRepresentationInContext: context]];
      [s appendFormat: @"<ThreadTopic xmlns=\"Email:\">%@</ThreadTopic>", [[self _getNormalizedSubject] activeSyncRepresentationInContext: context]];
    }

  // DateReceived
  value = [self date];
  if (value)
    [s appendFormat: @"<DateReceived xmlns=\"Email:\">%@</DateReceived>", [value activeSyncRepresentationInContext: context]];

  // DisplayTo
  [s appendFormat: @"<DisplayTo xmlns=\"Email:\">%@</DisplayTo>", [[context activeUser] login]];
  
  // Cc - same syntax as the To field
  value = [self _emailAddressesFrom: [[self envelope] cc]];
  if (value)
    [s appendFormat: @"<Cc xmlns=\"Email:\">%@</Cc>", [value activeSyncRepresentationInContext: context]];
    
  // Importance
  v = 0x1;
  value = [[self mailHeaders] objectForKey: @"x-priority"];
  if ([value isKindOfClass: [NSArray class]])
    p = [value lastObject];
  else
    p = value;

  if (p) 
    {
      if ([p hasPrefix: @"1"]) v = 0x2;
      else if ([p hasPrefix: @"2"]) v = 0x2;
      else if ([p hasPrefix: @"4"]) v = 0x0;
      else if ([p hasPrefix: @"5"]) v = 0x0;
    }
  else
    {
      value = [[self mailHeaders] objectForKey: @"importance"];
      if ([value isKindOfClass: [NSArray class]])
        p = [value lastObject];
      else
        p = value;

      if ([p hasPrefix: @"High"]) v = 0x2;
      else if ([p hasPrefix: @"Low"]) v = 0x0;
    }

  [s appendFormat: @"<Importance xmlns=\"Email:\">%d</Importance>", v];
  
  // Read
  [s appendFormat: @"<Read xmlns=\"Email:\">%d</Read>", ([self read] ? 1 : 0)];
  
  // We handle MeetingRequest
  calendar = [self calendarFromIMIPMessage];
 
  if (calendar)
    {
      NSString *method, *className;
      iCalPerson *attendee;
      iCalTimeZone *tz;
      iCalEvent *event;

      iCalPersonPartStat partstat;
      int v;

      event = [[calendar events] lastObject];
      method = [[event parent] method];

      // If we are the organizer, let's pick the attendee based on the From address
      if ([event userIsOrganizer: [context activeUser]])
        attendee = [event findAttendeeWithEmail: [[[[self envelope] from] lastObject] baseEMail]];
      else
        attendee = [event findAttendeeWithEmail: [[[context activeUser] allEmails] objectAtIndex: 0]];

      partstat = [attendee participationStatus];

      // We generate the correct MessageClass
      if ([method isEqualToString: @"REQUEST"])
        className = @"IPM.Schedule.Meeting.Request";
      else if ([method isEqualToString: @"REPLY"])
        {
          switch (partstat)
            {
            case iCalPersonPartStatAccepted:
              className = @"IPM.Schedule.Meeting.Resp.Pos";
              break;
            case iCalPersonPartStatDeclined:
              className = @"IPM.Schedule.Meeting.Resp.Neg";
              break;
            case iCalPersonPartStatTentative:
            case iCalPersonPartStatNeedsAction:
              className = @"IPM.Schedule.Meeting.Resp.Tent";
              break;
            default:
              className = @"IPM.Appointment";
              NSLog(@"unhandled part stat");
            }
        }
      else if ([method isEqualToString: @"COUNTER"])
        className = @"IPM.Schedule.Meeting.Resp.Tent";
      else if ([method isEqualToString: @"CANCEL"])
        className = @"IPM.Schedule.Meeting.Cancelled";
      else
        className = @"IPM.Appointment";
      
      [s appendFormat: @"<MessageClass xmlns=\"Email:\">%@</MessageClass>", className];
      
      [s appendString: @"<MeetingRequest xmlns=\"Email:\">"];

      [s appendFormat: @"<AllDayEvent xmlns=\"Email:\">%d</AllDayEvent>", ([event isAllDay] ? 1 : 0)];

      // StartTime -- https://msdn.microsoft.com/en-us/library/ee203365%28v=exchg.80%29.aspx
      if ([event startDate])
        [s appendFormat: @"<StartTime xmlns=\"Email:\">%@</StartTime>", [[event startDate] activeSyncRepresentationInContext: context]];
      
      if ([event timeStampAsDate])
        [s appendFormat: @"<DTStamp xmlns=\"Email:\">%@</DTStamp>", [[event timeStampAsDate] activeSyncRepresentationInContext: context]];
      else if ([event created])
        [s appendFormat: @"<DTStamp xmlns=\"Email:\">%@</DTStamp>", [[event created] activeSyncRepresentationInContext: context]];
      
      // EndTime -- https://msdn.microsoft.com/en-us/library/ee158628(v=exchg.80).aspx
      if ([event endDate])
        [s appendFormat: @"<EndTime xmlns=\"Email:\">%@</EndTime>", [[event endDate] activeSyncRepresentationInContext: context]];
      
      // FIXME: Single appointment - others are not supported right now
      [s appendFormat: @"<InstanceType xmlns=\"Email:\">%d</InstanceType>", 0];

      // Location
      if ([[event location] length])
        [s appendFormat: @"<Location xmlns=\"Email:\">%@</Location>", [[event location] activeSyncRepresentationInContext: context]];

      [s appendFormat: @"<Organizer xmlns=\"Email:\">%@</Organizer>", [[[event organizer] mailAddress] activeSyncRepresentationInContext: context]];

      // This will trigger the SendMail command. We set it to no for email invitations as
      // SOGo will send emails when MeetingResponse is called.
      [s appendFormat: @"<ResponseRequested xmlns=\"Email:\">%d</ResponseRequested>", 0];

      // Sensitivity
      if ([[event accessClass] isEqualToString: @"PRIVATE"])
        v = 2;
      if ([[event accessClass] isEqualToString: @"CONFIDENTIAL"])
        v = 3;
      else
        v = 0;

      [s appendFormat: @"<Sensitivity xmlns=\"Email:\">%d</Sensitivity>", v];
      
      [s appendFormat: @"<BusyStatus xmlns=\"Email:\">%d</BusyStatus>", 2];

      // Timezone
      tz = [(iCalDateTime *)[event firstChildWithTag: @"dtstart"] timeZone];
      
      if (!tz)
        tz = [iCalTimeZone timeZoneForName: @"Europe/London"];
      
      [s appendFormat: @"<TimeZone xmlns=\"Email:\">%@</TimeZone>", [tz activeSyncRepresentationInContext: context]];
      

      // We disallow new time proposals
      [s appendFormat: @"<DisallowNewTimeProposal xmlns=\"Email:\">%d</DisallowNewTimeProposal>", 1];
      
      // From http://blogs.msdn.com/b/exchangedev/archive/2011/07/22/working-with-meeting-requests-in-exchange-activesync.aspx:
      //
      // "Clients that need to determine whether the GlobalObjId  element for a meeting request corresponds to an existing Calendar
      // object in the Calendar folder have to convert the GlobalObjId element value to a UID element value to make the comparison."
      //
      globalObjId = [self _computeGlobalObjectIdFromEvent: event];
      [s appendFormat: @"<GlobalObjId xmlns=\"Email:\">%@</GlobalObjId>", [globalObjId activeSyncRepresentationInContext: context]];

      // We set the right message type - we must set AS version to 14.1 for this
      if ([[[context request] headerForKey: @"MS-ASProtocolVersion"] isEqualToString: @"14.1"])
        [s appendFormat: @"<MeetingMessageType xmlns=\"Email2:\">%d</MeetingMessageType>", 1];

      [s appendString: @"</MeetingRequest>"];

      // ContentClass
      [s appendFormat: @"<ContentClass xmlns=\"Email:\">%@</ContentClass>", @"urn:content-classes:calendarmessage"];
    }
  else
    {
      // MesssageClass and ContentClass
      [s appendFormat: @"<MessageClass xmlns=\"Email:\">%@</MessageClass>", @"IPM.Note"];
      [s appendFormat: @"<ContentClass xmlns=\"Email:\">%@</ContentClass>", @"urn:content-classes:message"];
    }

  // Reply-To - FIXME
  //NSArray *replyTo = [[message objectForKey: @"envelope"] replyTo];
  //if ([replyTo count])
  //  [s appendFormat: @"<Reply-To xmlns=\"Email:\">%@</Reply-To>", [addressFormatter stringForArray: replyTo]];
  
  // InternetCPID - 65001 == UTF-8, we use this all the time for now.
  //              - 20127 == US-ASCII
  [s appendFormat: @"<InternetCPID xmlns=\"Email:\">%@</InternetCPID>", @"65001"];
          
  // Body - namespace 17
  preferredBodyType = [[context objectForKey: @"BodyPreferenceType"] intValue];

  nativeBodyType = 1;
  d = [self _preferredBodyDataUsingType: preferredBodyType  nativeType: &nativeBodyType];

  if (calendar && !d)
    {
      WOApplication *app;
      SOGoAptMailNotification *p;
      NSString *pageName;

      nativeBodyType = 2;

      /* get WOApplication instance */
      app = [WOApplication application];

      /* create page name */
      pageName = [NSString stringWithFormat: @"SOGoAptMail%@", @"Invitation"];
      /* construct message content */
      p = [app pageWithName: pageName inContext: context];
      [p setApt: (iCalEvent *)  [[calendar events] lastObject]];

      if ([[ [[calendar events] lastObject] organizer] cn] && [[[ [[calendar events] lastObject] organizer] cn] length])
        {
          [p setOrganizerName: [[ [[calendar events] lastObject] organizer] cn]];
        }
      else
        {
          [p setOrganizerName: [[SOGoUser userWithLogin: owner] cn]];
        }

      if (preferredBodyType == 1 && nativeBodyType == 2)
        d = [[[p getBody] htmlToText] dataUsingEncoding: NSUTF8StringEncoding];
      else
        {
          preferredBodyType = 2;
          d = [[p getBody] dataUsingEncoding: NSUTF8StringEncoding];
        }

    }
  
  if (d)
    {
      NSMutableData *sanitizedData;
      NSString *content;
      int len, truncated;

      // Outlook fails to decode quoted-printable (see #3082) if lines are not termined by CRLF.
      const char *bytes;
      char *mbytes;
      int mlen;

      len = [d length];
      mlen = 0;

      sanitizedData = [NSMutableData dataWithLength: len*2];

      bytes = [d bytes];
      mbytes = [sanitizedData mutableBytes];

      while (len > 0)
        {
          if (*bytes == '\n' && *(bytes-1) != '\r' && mlen > 0)
            {
              *mbytes = '\r';
              mbytes++;
              mlen++;
            }

          *mbytes = *bytes;
          mbytes++; bytes++;
          len--;
          mlen++;
        }

      [sanitizedData setLength: mlen];

      content = [[NSString alloc] initWithData: sanitizedData  encoding: NSUTF8StringEncoding];

      // FIXME: This is a hack. We should normally avoid doing this as we might get
      // broken encodings. We should rather tell that the data was truncated and expect
      // a ItemOperations call to download the whole base64 encoding multipart.
      //
      // See http://social.msdn.microsoft.com/Forums/en-US/b9944e49-9bc9-4ab8-ba33-a9fc08557c5b/mime-raw-data-in-eas-sync-response?forum=os_exchangeprotocols
      // for an "interesting" discussion around this.
      //
      if (!content)
        content = [[NSString alloc] initWithData: sanitizedData  encoding: NSISOLatin1StringEncoding];
      
      AUTORELEASE(content);
      
      content = [content activeSyncRepresentationInContext: context];
      truncated = 0;

      len = [content length];

      if ([[[context request] headerForKey: @"MS-ASProtocolVersion"] isEqualToString: @"2.5"])
        {
          [s appendFormat: @"<Body xmlns=\"Email:\">%@</Body>", content];
          [s appendFormat: @"<BodyTruncated xmlns=\"Email:\">%d</BodyTruncated>", truncated];
        }
      else
       {
          [s appendString: @"<Body xmlns=\"AirSyncBase:\">"];

          // Set the correct type if client requested text/html but we got text/plain
          if (preferredBodyType == 2 && nativeBodyType == 1)
             [s appendString: @"<Type>1</Type>"];
          else
             [s appendFormat: @"<Type>%d</Type>", preferredBodyType];

          [s appendFormat: @"<Truncated>%d</Truncated>", truncated];
          [s appendFormat: @"<Preview></Preview>"];

          if (!truncated)
            {
              [s appendFormat: @"<Data>%@</Data>", content];
              [s appendFormat: @"<EstimatedDataSize>%d</EstimatedDataSize>", len];
            }
          [s appendString: @"</Body>"];
       }
    }
  
  // Attachments -namespace 16
  attachmentKeys = [self fetchFileAttachmentKeys];
  if ([attachmentKeys count])
    {
      int i;

      if ([[[context request] headerForKey: @"MS-ASProtocolVersion"] isEqualToString: @"2.5"])
        [s appendString: @"<Attachments xmlns=\"Email:\">"];
      else
        [s appendString: @"<Attachments xmlns=\"AirSyncBase:\">"];

      for (i = 0; i < [attachmentKeys count]; i++)
        {
          value = [attachmentKeys objectAtIndex: i];

          [s appendString: @"<Attachment>"];
          [s appendFormat: @"<DisplayName>%@</DisplayName>", [[value objectForKey: @"filename"] activeSyncRepresentationInContext: context]];

          // FileReference must be a unique identifier across the whole store. We use the following structure:
          // mail/<foldername>/<message UID/<pathofpart>
          // mail/INBOX/2          
          if ([[[context request] headerForKey: @"MS-ASProtocolVersion"] isEqualToString: @"2.5"])
            [s appendFormat: @"<AttName>mail/%@/%@/%@</AttName>", [[[self container] relativeImap4Name] stringByEscapingURL], [self nameInContainer], [value objectForKey: @"path"]];
          else
            [s appendFormat: @"<FileReference>mail/%@/%@/%@</FileReference>", [[[self container] relativeImap4Name] stringByEscapingURL], [self nameInContainer], [value objectForKey: @"path"]];

          if ([[[context request] headerForKey: @"MS-ASProtocolVersion"] isEqualToString: @"2.5"])
            {
              [s appendFormat: @"<AttMethod>%d</AttMethod>", 1];
              [s appendFormat: @"<AttSize>%d</AttSize>", [[value objectForKey: @"size"] intValue]];
            }
          else
            {
              [s appendFormat: @"<Method>%d</Method>", 1]; // See: http://msdn.microsoft.com/en-us/library/ee160322(v=exchg.80).aspx
              [s appendFormat: @"<EstimatedDataSize>%d</EstimatedDataSize>", [[value objectForKey: @"size"] intValue]];
              //[s appendFormat: @"<IsInline>%d</IsInline>", 1];
            }
          [s appendString: @"</Attachment>"];
        }

      [s appendString: @"</Attachments>"];
    }
  
  // Flags
  [s appendString: @"<Flag xmlns=\"Email:\">"];
  [s appendFormat: @"<FlagStatus>%d</FlagStatus>", ([self flagged] ? 2 : 0)];
  [s appendString: @"</Flag>"];


  // Categroies/Labels
  NSEnumerator *categories;
  categories = [[[self fetchCoreInfos] objectForKey: @"flags"] objectEnumerator];

  if (categories)
    {
      NSString *currentFlag;
      NSDictionary *v;

      v = [[[context activeUser] userDefaults] mailLabelsColors];

      [s appendFormat: @"<Categories xmlns=\"Email:\">"];
      while ((currentFlag = [categories nextObject]))
        {
          if ([[v objectForKey: currentFlag] objectAtIndex:0])
            [s appendFormat: @"<Category>%@</Category>", [[[v objectForKey: currentFlag] objectAtIndex:0] activeSyncRepresentationInContext: context]];
        }
      [s appendFormat: @"</Categories>"];
    }
  
  if ([[[context request] headerForKey: @"MS-ASProtocolVersion"] isEqualToString: @"14.0"] ||
      [[[context request] headerForKey: @"MS-ASProtocolVersion"] isEqualToString: @"14.1"])
    {
      NSString *reference;

      reference = [[[[self mailHeaders] objectForKey: @"references"] componentsSeparatedByString: @" "] objectAtIndex: 0];

      if ([reference length] > 0)
        [s appendFormat: @"<ConversationId xmlns=\"Email2:\">%@</ConversationId>", [[reference dataUsingEncoding: NSUTF8StringEncoding] activeSyncRepresentationInContext: context]];
      else if ([self inReplyTo])
        [s appendFormat: @"<ConversationId xmlns=\"Email2:\">%@</ConversationId>", [[[self inReplyTo] dataUsingEncoding: NSUTF8StringEncoding] activeSyncRepresentationInContext: context]];
      else if ([self messageId])
        [s appendFormat: @"<ConversationId xmlns=\"Email2:\">%@</ConversationId>", [[[self messageId] dataUsingEncoding: NSUTF8StringEncoding] activeSyncRepresentationInContext: context]];
    }

  // FIXME - support these in the future
  //[s appendString: @"<ConversationIndex xmlns=\"Email2:\">zot=</ConversationIndex>"];

  
  // NativeBodyType -- http://msdn.microsoft.com/en-us/library/ee218276(v=exchg.80).aspx
  // This is a required child element.
  // 1 -> plain/text, 2 -> HTML and 3 -> RTF
  if (nativeBodyType == 4)
    nativeBodyType = 1;

  [s appendFormat: @"<NativeBodyType xmlns=\"AirSyncBase:\">%d</NativeBodyType>", nativeBodyType];
  
  return s;
}

//
//
//
// Exemple for a message being marked as read:
//
//  <Change>
//   <ServerId>607</ServerId>
//   <ApplicationData>
//    <Read xmlns="Email:">1</Read>
//   </ApplicationData>
//  </Change>
// </Commands>
//
- (void) takeActiveSyncValues: (NSDictionary *) theValues
                    inContext: (WOContext *) _context
{
  id o;

  if ((o = [theValues objectForKey: @"Flag"]))
    {
      // We must handle empty flags -> {Flag = ""; } - some ActiveSync clients, like the HTC Desire
      // will send an empty Flag message when "unflagging" a mail.
      if (([o isKindOfClass: [NSMutableDictionary class]]))
        {
          if ((o = [o objectForKey: @"FlagStatus"]))
            {
              // 0 = The flag is cleared.
              // 1 = The status is set to complete.
              // 2 = The status is set to active.
              if (([o isEqualToString: @"2"]))
                [self addFlags: @"\\Flagged"];
              else
                [self removeFlags: @"\\Flagged"];
            }
        }
      else
        [self removeFlags: @"\\Flagged"]; 
    }
  
  if ((o = [theValues objectForKey: @"Read"]))
    {
      if ([o intValue])
        [self addFlags: @"seen"];
      else
        [self removeFlags: @"seen"];;
    }

  if ((o = [theValues objectForKey: @"Categories"]))
    {
      NSEnumerator *categories;
      NSString *currentFlag;
      NSDictionary *v;

      v = [[[context activeUser] userDefaults] mailLabelsColors];

      // add categories/labels sent from client
      if ([o isKindOfClass: [NSArray class]])
        {
          NSEnumerator *enumerator;
          NSMutableArray *labels;
          NSEnumerator *flags;
          id key;

          labels = [NSMutableArray array];

          enumerator = [v keyEnumerator];
          flags = [o objectEnumerator];

          while ((currentFlag = [flags nextObject]))
            {
              while ((key = [enumerator nextObject]))
                {
                  if (([currentFlag isEqualToString:[[v objectForKey:key] objectAtIndex:0]]))
                    {
                      [labels addObject: key];
                      break;
                    }
                }
            }

          [self addFlags: [labels componentsJoinedByString: @" "]];
        }

      categories = [[[self fetchCoreInfos] objectForKey: @"flags"] objectEnumerator];

      // remove all categories/labels from server which were not it the list sent from client
      if (categories)
        {
          while ((currentFlag = [categories nextObject]))
            {
              // only deal with lables and don't touch flags like seen and flagged
              if (([v objectForKey: currentFlag]))
                {
                  if (![o isKindOfClass: [NSArray class]])
                    {
                      [self removeFlags: currentFlag];
                    }
                  else if (([o indexOfObject: [[v objectForKey:currentFlag] objectAtIndex:0]] == NSNotFound))
                    {
                      [self removeFlags: currentFlag];
                    }
                }
            }
        }
    }
}

@end
