/*
  Copyright (C) 2000-2004 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.
*/

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

#import <NGObjWeb/WOContext+SoObjects.h>
#import <NGObjWeb/WOResponse.h>
#import <NGExtensions/NSCalendarDate+misc.h>
#import <NGCards/iCalCalendar.h>
#import <NGCards/iCalFreeBusy.h>
#import <NGCards/iCalPerson.h>

#import <SOGo/LDAPUserManager.h>
#import <SOGo/SOGoUser.h>
#import <SOGo/SOGoPermissions.h>

#import "SOGoAppointmentFolder.h"
#import "SOGoAppointmentFolders.h"

#import "SOGoFreeBusyObject.h"

static unsigned int freebusyRangeStart = 0;
static unsigned int freebusyRangeEnd = 0;

@interface SOGoFreeBusyObject (PrivateAPI)
- (NSString *) iCalStringForFreeBusyInfos: (NSArray *) _infos
                                     from: (NSCalendarDate *) _startDate
                                       to: (NSCalendarDate *) _endDate;
@end

@implementation SOGoFreeBusyObject

+ (void) initialize
{
  NSArray *freebusyDateRange;
  NSUserDefaults *ud;

  ud = [NSUserDefaults standardUserDefaults];
  freebusyDateRange = [ud arrayForKey: @"SOGoFreeBusyDefaultInterval"];
  if (freebusyDateRange && [freebusyDateRange count] > 1)
    {
      freebusyRangeStart = [[freebusyDateRange objectAtIndex: 0] unsignedIntValue];
      freebusyRangeEnd = [[freebusyDateRange objectAtIndex: 1] unsignedIntValue];
    }
  else
    {
      freebusyRangeStart = 7;
      freebusyRangeEnd = 7;
    }
}

- (iCalPerson *) iCalPersonWithUID: (NSString *) uid
{
  iCalPerson *person;
  LDAPUserManager *um;
  NSDictionary *contactInfos;

  um = [LDAPUserManager sharedUserManager];
  contactInfos = [um contactInfosForUserWithUIDorEmail: uid];

  person = [iCalPerson new];
  [person autorelease];
  [person setCn: [contactInfos objectForKey: @"cn"]];
  [person setEmail: [contactInfos objectForKey: @"c_email"]];

  return person;
}

/* Private API */
- (iCalFreeBusyType) _fbTypeForEventStatus: (NSNumber *) eventStatus
{
  unsigned int status;
  iCalFreeBusyType fbType;

  status = [eventStatus unsignedIntValue];
  if (status == 0)
    fbType = iCalFBBusyTentative;
  else if (status == 1)
    fbType = iCalFBBusy;
  else
    fbType = iCalFBFree;

  return fbType;    
}

- (NSString *) iCalStringForFreeBusyInfos: (NSArray *) _infos
			       withMethod: (NSString *) method
                                     from: (NSCalendarDate *) _startDate
                                       to: (NSCalendarDate *) _endDate
{
  NSString *uid;
  NSEnumerator *events;
  iCalCalendar *calendar;
  iCalFreeBusy *freebusy;
  NSDictionary *info;
  iCalFreeBusyType type;

  uid = [container ownerInContext: context];

  calendar = [iCalCalendar groupWithTag: @"vcalendar"];
  [calendar setProdID: @"//Inverse groupe conseil/SOGo 0.9"];
  [calendar setVersion: @"2.0"];
  if (method)
    [calendar setMethod: method];

  freebusy = [iCalFreeBusy groupWithTag: @"vfreebusy"];
  [freebusy addToAttendees: [self iCalPersonWithUID: uid]];
  [freebusy setTimeStampAsDate: [NSCalendarDate calendarDate]];
  [freebusy setStartDate: _startDate];
  [freebusy setEndDate: _endDate];

  /* ORGANIZER - strictly required but missing for now */

  /* ATTENDEE */
//   person = [self iCalPersonWithUid: uid];
//   [person setTag: @"ATTENDEE"];
//   [ms appendString: [person versitString]];

  /* FREEBUSY */
  events = [_infos objectEnumerator];
  while ((info = [events nextObject]))
    if ([[info objectForKey: @"c_isopaque"] boolValue])
      {
	type = [self _fbTypeForEventStatus: [info objectForKey: @"c_status"]];
	[freebusy addFreeBusyFrom: [info objectForKey: @"startDate"]
		  to: [info objectForKey: @"endDate"]
		  type: type];
      }

  [calendar setUniqueChild: freebusy];

  return [calendar versitString];
}

- (NSString *) contentAsString
{
  NSCalendarDate *today, *startDate, *endDate;
  NSTimeZone *timeZone;
  
  today = [[NSCalendarDate calendarDate] beginOfDay];
  timeZone = [[context activeUser] timeZone];
  [today setTimeZone: timeZone];

  startDate = [today dateByAddingYears: 0 months: 0 days: -freebusyRangeStart
                     hours: 0 minutes: 0 seconds: 0];
  endDate = [today dateByAddingYears: 0 months: 0 days: freebusyRangeEnd
		   hours: 0 minutes: 0 seconds: 0];

  return [self contentAsStringFrom: startDate to: endDate];
}

- (NSString *) contentAsStringWithMethod: (NSString *) method
				    from: (NSCalendarDate *) _startDate
				      to: (NSCalendarDate *) _endDate
{
  NSArray *infos;
  
  infos = [self fetchFreeBusyInfosFrom: _startDate to: _endDate];

  return [self iCalStringForFreeBusyInfos: infos withMethod: method
	       from: _startDate to: _endDate];
}

- (NSString *) contentAsStringFrom: (NSCalendarDate *) _startDate
				to: (NSCalendarDate *) _endDate
{
  return [self contentAsStringWithMethod: nil
	       from: _startDate
	       to: _endDate];
}

- (NSArray *) fetchFreeBusyInfosFrom: (NSCalendarDate *) startDate
                                  to: (NSCalendarDate *) endDate
{
  SOGoAppointmentFolder *calFolder;
//   SoSecurityManager *sm;
  NSArray *folders;
  NSMutableArray *infos;
  unsigned int count, max;

  infos = [NSMutableArray array];

  folders = [[container lookupName: @"Calendar"
			inContext: context
			acquire: NO] subFolders];
  max = [folders count];
  for (count = 0; count < max; count++)
    {
      calFolder = [folders objectAtIndex: count];
      if (![calFolder isSubscription])
	[infos addObjectsFromArray: [calFolder fetchFreeBusyInfosFrom: startDate
					       to: endDate]];
    }

  return infos;
}

- (NSString *) iCalString
{
  // for UI-X appointment viewer
  return [self contentAsString];
}

/* deliver content without need for view method */

- (id) GETAction: (id)_ctx
{
  WOResponse *r;
  NSData     *contentData;

  contentData = [[self contentAsString]
		  dataUsingEncoding: NSUTF8StringEncoding];

  r = [(WOContext *) _ctx response];
  [r setHeader: @"text/calendar" forKey: @"content-type"];
  [r setContent: contentData];
  [r setStatus: 200];

  return r;
}

- (BOOL) isFolderish
{
  return NO;
}

- (NSString *) davContentType
{
  return @"text/calendar";
}

- (NSArray *) aclsForUser: (NSString *) uid
{
  return nil;
}

@end