/*
  Copyright (C) 2000-2005 SKYRIX Software AG

  This file is part of SOPE.

  SOPE is free software; you can redistribute it and/or modify it under
  the terms of the GNU Lesser General Public License as published by the
  Free Software Foundation; either version 2, or (at your option) any
  later version.

  SOPE is distributed in the hope that it will be useful, but WITHOUT ANY
  WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with SOPE; see the file COPYING.  If not, write to the
  Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  02111-1307, USA.
*/

#include "NGMimeMessageGenerator.h"
#include "NGMimeMessage.h"
#include <NGMime/NGMimeFileData.h>
#include "common.h"

@implementation NGMimeMessageGenerator

static BOOL debugOn = NO;

+ (int)version {
  return 2;
}
+ (void)initialize {
  NSUserDefaults *ud = [NSUserDefaults standardUserDefaults];

  NSAssert2([super version] == 2,
            @"invalid superclass (%@) version %i !",
            NSStringFromClass([self superclass]), [super version]);
  
  debugOn = [ud boolForKey:@"NGMimeGeneratorDebugEnabled"];
  if (debugOn)
    NSLog(@"WARNING[%@]: NGMimeGeneratorDebugEnabled is enabled!", self);
}

/* header field specifics */

- (NSData *)generateDataForHeaderField:(NSString *)_headerField
  value:(id)_value
{
  NSData *data = nil;

  data = [super generateDataForHeaderField:_headerField
                value:_value];
  {
    const char   *bytes  = NULL;
    unsigned int length  = 0;
    unsigned int desLen  = 0;
    char         *des    = NULL;
    unsigned int cnt     = 0;
    BOOL         doEnc   = NO;
    NSString     *str;

#if APPLE_Foundation_LIBRARY || NeXT_Foundation_LIBRARY
    str = [[NSString alloc] initWithData:data
                            encoding:NSISOLatin1StringEncoding];
#else
    str = [[NSString alloc] initWithData:data
                            encoding:NSISOLatin9StringEncoding];
#endif
    str = [str autorelease];
    
    bytes  = [str cString];
    length = [str cStringLength];

    while (cnt < length) {
      if ((unsigned char)bytes[cnt] > 127) {
        doEnc = YES;
        break;
      }
      cnt++;
    }
    if (doEnc) {
      char        iso[]     = "=?iso-8859-15?q?";
      unsigned    isoLen    = 16;
      char        isoEnd[]  = "?=";
      unsigned    isoEndLen = 2;
      
      desLen = length * 3 + 20;
      
      des = calloc(desLen + 2, sizeof(char));
      
      // memcpy(des, bytes, cnt);
      memcpy(des, iso, isoLen);
      desLen = NGEncodeQuotedPrintableMime(bytes, length,
                                           des + isoLen, desLen - isoLen);
      if ((int)desLen != -1) {
        memcpy(des + isoLen + desLen, isoEnd, isoEndLen);
        
        data = [NSData dataWithBytesNoCopy:des
		       length:(isoLen + desLen + isoEndLen)];
      }
      else {
        NSLog(@"WARNING: An error occour during quoted-printable decoding");
        if (des != NULL) free(des);
      }
    }
  }
  return data;
}


/* content-transfer-encoding */

- (id<NGMimeBodyGenerator>)defaultBodyGenerator {
  NGMimeMessageBodyGenerator *gen;
  
  gen  = [[NGMimeMessageBodyGenerator alloc] init];
  [gen setUseMimeData:self->useMimeData];
  return gen;
}

- (id<NGMimeBodyGenerator>)generatorForBodyOfPart:(id<NGMimePart>)_part {
  /* called by -generateBodyData:? */
  id<NGMimeBodyGenerator> bodyGen;
  NGMimeType              *contentType;
  NSString                *type;
  Class generatorClass;
  
  if (self->delegateRespondsTo.generatorGeneratorForBodyOfPart) {
    bodyGen = [self->delegate mimePartGenerator:self
                              generatorForBodyOfPart:self->part];
  
    if (bodyGen != nil)
      return bodyGen;
  }
  
  if ((contentType = [_part contentType]) == nil)
    contentType = [self defaultContentTypeForPart:_part];
  
  if (contentType == nil) {
    [self logWithFormat:@"WARNING(%s): missing content-type in part 0x%08X.",
	    __PRETTY_FUNCTION__, _part];
    return nil;
  }
  
  type = [contentType type];

  generatorClass = Nil;
  if ([type isEqualToString:NGMimeTypeMultipart])
    generatorClass = [NGMimeMessageMultipartBodyGenerator class];
  else if ([type isEqualToString:NGMimeTypeText])
    generatorClass = [NGMimeMessageTextBodyGenerator class];
  else if (([type isEqualToString:NGMimeTypeMessage]) &&
           [[contentType subType] isEqualToString:@"rfc822"]) {
    generatorClass = [NGMimeMessageRfc822BodyGenerator class];
  }

  if (generatorClass == Nil) {
    [self debugWithFormat:
	    @"found no body generator class for part with type: %@", 
	    contentType];
    return nil;
  }
  
  if (debugOn) {
    [self debugWithFormat:@"using body generator class %@ for part: %@",
	    generatorClass, _part];
  }
  
  /* allocate generator */
  
  bodyGen = [[[generatorClass alloc] init] autorelease];
  [(id)bodyGen setUseMimeData:self->useMimeData];
  return bodyGen;
}

/* debugging */

- (BOOL)isDebuggingEnabled {
  return debugOn;
}

@end /* NGMimeMessageGenerator */