/*
  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.
*/

#import <Foundation/NSCalendarDate.h>
#import <Foundation/NSDictionary.h>
#import <Foundation/NSValue.h>

#import "iCalEvent.h"
#import "iCalTrigger.h"
#import "iCalToDo.h"

#import "NSString+NGCards.h"

@implementation iCalTrigger

/* accessors */

- (void) setValueType: (NSString *) theValue
{
  [self setValue: 0 ofAttribute: @"value" to: theValue];
}

- (NSString *) valueType
{
  return [self value: 0 ofAttribute: @"value"];
}

- (void) setRelationType: (NSString *) theRelationType
{
  [self setValue: 0 ofAttribute: @"related" to: theRelationType];
}

- (NSString *) relationType
{
  return [self value: 0 ofAttribute: @"related"];
}

- (NSDictionary *) asDictionary
{
  NSDictionary *data;
  NSString *duration, *relation, *reference, *quantity=@"", *unit=@"";
  NSUInteger i;
  unichar c;

  data = nil;
  if (![[self valueType] length] ||
      [[self valueType] caseInsensitiveCompare: @"DURATION"] == NSOrderedSame)
    {
      relation = [[self relationType] uppercaseString];
      if (![relation length])
        relation = @"START";
      duration = [self flattenedValuesForKey: @""];
      i = 0;
      c = [duration characterAtIndex: i];
      if (c == '-')
        {
          reference = @"BEFORE";
          i++;
        }
      else
        {
          reference = @"AFTER";
        }
      c = [duration characterAtIndex: i];
      if (c == 'P')
        {
          quantity = @"";
          unit = @"";
          // Parse duration -- ignore first character (P)
          for (i++; i < [duration length]; i++)
            {
              c = [duration characterAtIndex: i];
              if (c == 't' || c == 'T')
                // time -- ignore character
                continue;
              else if (isdigit (c))
                quantity = [quantity stringByAppendingFormat: @"%c", c];
              else
                {
                  switch (c)
                    {
                    case 'D': /* day  */
                      unit = @"DAYS";
                      break;
                    case 'H': /* hour */
                      unit = @"HOURS";
                      break;
                    case 'M': /* min  */
                      unit = @"MINUTES";
                      break;
                    case 'W': /* week  */
                      unit = @"WEEKS";
                      break;
                    default:
                      NSLog(@"Cannot process duration unit: '%c'", c);
                      break;
                    }
                }
            }
	}
      data = [NSDictionary dictionaryWithObjectsAndKeys:
                             relation, @"relation",
                           reference, @"reference",
                           [NSNumber numberWithInt: [quantity intValue]], @"quantity",
                           unit, @"unit",
                           nil];
    }

  return data;
}

- (NSCalendarDate *) nextAlarmDate
{
  NSCalendarDate *relationDate, *nextAlarmDate;
  NSString *relation, *triggerValue;
  NSTimeInterval anInterval;
  id grandParent;

  nextAlarmDate = nil;
  triggerValue = [[self valueType] uppercaseString];
  if ([triggerValue length] == 0)
    triggerValue = @"DURATION";

  if ([triggerValue isEqualToString: @"DURATION"])
    {
      relation = [[self relationType] uppercaseString];

      grandParent = [parent parent];
      if ([relation isEqualToString: @"END"])
        {
          if ([grandParent isKindOfClass: [iCalEvent class]])
            relationDate = [(iCalEvent *) grandParent endDate];
          else
            relationDate = [(iCalToDo *) grandParent due];
        }
      else
        relationDate = [(iCalEntityObject *) grandParent startDate];
	      
      // Compute the next alarm date with respect to the reference date
      if (relationDate)
        {
          anInterval = [[self flattenedValuesForKey: @""]
                         durationAsTimeInterval];
          nextAlarmDate = [relationDate addTimeInterval: anInterval];
        }
    }
  else if ([triggerValue isEqualToString: @"DATE-TIME"])
    nextAlarmDate = [[self flattenedValuesForKey: @""] asCalendarDate];

  return nextAlarmDate;
}

@end /* iCalTrigger */