// $Id$

#include "UIxCalMonthView.h"
#include <NGExtensions/NGExtensions.h>
#include "common.h"


@interface NSCalendarDate (UIxCalMonthViewExtensions)
- (NSCalendarDate *)dayOfWeeK:(unsigned)_day
             offsetFromSunday:(unsigned)_offset;
- (NSCalendarDate *)sundayOfWeek;
@end

@implementation NSCalendarDate (UIxCalMonthViewExtensions)
- (NSCalendarDate *)dayOfWeeK:(unsigned)_day
                    offsetFromSunday:(unsigned)_offset
{
    unsigned dayOfWeek, distance;
    
    /* perform "locale" correction */
    dayOfWeek = (7 + [self dayOfWeek] - _offset) % 7;

    _day = (_day % 7);
    if(_day == dayOfWeek)
        return self;

    distance = _day - dayOfWeek;
    return [self dateByAddingYears:0 months:0 days:distance];
}

/* this implies that monday is the start of week! */
- (NSCalendarDate *)sundayOfWeek {
    return [self dayOfWeeK:6 offsetFromSunday:1];
}
@end

@implementation UIxCalMonthView

- (NSCalendarDate *)startOfMonth {
    return [[[super startDate] firstDayOfMonth] beginOfDay];
}

- (NSCalendarDate *)startDate {
  return [[self startOfMonth] mondayOfWeek];
}

- (NSCalendarDate *)endDate {
  NSCalendarDate *date = [self startOfMonth];
  date = [date dateByAddingYears:0
               months:0
               days:[date numberOfDaysInMonth]
               hours:0
               minutes:0
               seconds:0];
  date = [[date sundayOfWeek] endOfDay];
  return date;
}

/* URLs */


- (NSDictionary *)prevMonthQueryParameters {
    NSCalendarDate *date;

    date = [[self startOfMonth] dateByAddingYears:0
                                months:-1
                                days:0
                                hours:0
                                minutes:0
                                seconds:0];
    return [self queryParametersBySettingSelectedDate:date];
}

- (NSDictionary *)nextMonthQueryParameters {
    NSCalendarDate *date;
    
    date = [[self startOfMonth] dateByAddingYears:0
                                months:1
                                days:0
                                hours:0
                                minutes:0
                                seconds:0];
    return [self queryParametersBySettingSelectedDate:date];
}

@end /* UIxCalMonthView */