/*
  Copyright (C) 2000-2003 SKYRIX Software AG

  This file is part of OGo

  OGo 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.

  OGo 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 OGo; see the file COPYING.  If not, write to the
  Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  02111-1307, USA.
*/
// $Id$

#include "SkyAdaptorDataSource.h"
#import "common.h"
//#import "LSCommandContext.h"

/* TODO: uses non-protocolized stuff of SkyContext ... (to be fixed by hh) */
#define LSDatabaseChannelKey     @"channel"
#define LSUserDefaultsKey        @"userDefaults"
@interface NSObject(SkyContextStuff)
- (BOOL)begin;
- (BOOL)commit;
- (BOOL)rollback;
- (BOOL)isTransactionInProgress;
@end

@implementation SkyAdaptorDataSource

+ (int)version {
  return [super version] + 0; /* v2 */
}
+ (void)initialize {
  NSAssert2([super version] == 2,
            @"invalid superclass (%@) version %i !",
            NSStringFromClass([self superclass]), [super version]);
}

+ (EOAdaptor *)adaptorForContext:(id)_ctx {
  return  [[[[_ctx valueForKey:LSDatabaseChannelKey]
                   adaptorChannel]
                   adaptorContext]
                   adaptor];
}
+ (NSUserDefaults *)defaultsForContext:(id)_ctx {
  return [_ctx valueForKey:LSUserDefaultsKey];
}

- (id)initWithContext:(id)_ctx {
  if ((self = [super initWithAdaptorChannel:nil])) {
    ASSIGN(self->context, _ctx);
  }
  return self;
}

- (id)initWithContext:(id)_ctx
  adaptorName:(NSString *)_adaptor
  connectionDictionary:(NSDictionary *)_condict
  primaryKeyGenerationDictionary:(NSDictionary *)_pkeydict
{
  EOAdaptor *adaptor;

  if ((adaptor = [[self class] adaptorForContext:_ctx]) != nil)
    _adaptor = [adaptor name];
  
  if (_condict == nil)
    _condict = [adaptor connectionDictionary];

  if (_pkeydict == nil) {
    if ([[adaptor name] isEqualToString:_adaptor])
      _pkeydict = [adaptor pkeyGeneratorDictionary];
  }
  
  self = [super initWithAdaptorName:_adaptor
                connectionDictionary:_condict
                primaryKeyGenerationDictionary:_pkeydict];
  return self;
}

- (NSTimeZone *)_defaultTimeZone {
  NSTimeZone *tz;
  NSString *tzname;
  
  tzname = [[[self class] defaultsForContext:self->context]
                   stringForKey:@"timezone"];
  if ([tzname length] == 0) tzname = @"GMT";
  
  tz = [NSTimeZone timeZoneWithAbbreviation:tzname];
  
  return tz;
}

- (void)setFetchSpecification:(EOFetchSpecification *)_fSpec {
  NSTimeZone *tz;
    
  tz = [self _defaultTimeZone];

  if (tz && ![_fSpec isEqual:[self fetchSpecification]]) {
    NSMutableDictionary *dict;
    
    dict = [[_fSpec hints] mutableCopy];
    [dict setObject:tz forKey:EOFetchResultTimeZone];
    [_fSpec setHints:dict];
    RELEASE(dict);
  }
  [super setFetchSpecification:_fSpec];
}

- (EOAdaptorChannel *)beginTransaction {
  if (self->context == nil) {
    return [super beginTransaction];
  }
  else {
    if ([self->context isTransactionInProgress] == NO) {
      self->commitTransaction = YES;
      [self->context begin];
    }
    else {
      self->commitTransaction = NO;
    }
    return [[self->context valueForKey:LSDatabaseChannelKey] adaptorChannel];
  }
}

- (void)commitTransaction {
  if (self->context == nil) {
    [super commitTransaction];
    return;
  }

  if (self->commitTransaction == YES) {
    self->commitTransaction = NO;
    [self->context commit];
  }
}

- (void)rollbackTransaction {
  if (self->context == nil)
    [super rollbackTransaction];
  else {
    [self->context rollback];
    self->commitTransaction = NO;
  }
}

@end /* SkyAdaptorDataSource */