//
//  NSDate+CL.m
//  CLWeeklyCalendarView
//

#import "NSDate+CL.h"

@implementation NSDate (CL)


-(NSDate *)getWeekStartDate: (NSInteger)weekStartIndex
{
    int weekDay = [[self getWeekDay] intValue];
    
    NSInteger gap = (weekStartIndex <=  weekDay) ?  weekDay  : ( 7 + weekDay );
    NSInteger day = weekStartIndex - gap;
    
    return [self addDays:day];
}

-(NSNumber *)getWeekDay
{
	NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
	NSDateComponents *comps = [gregorian components:NSCalendarUnitWeekday fromDate:self];
    return [NSNumber numberWithInteger:([comps weekday] - 1)];
}

-(NSDate *)addDays:(NSInteger)day
{
    NSDateComponents *dayComponent = [[NSDateComponents alloc] init];
    dayComponent.day = day;
    
    NSCalendar *theCalendar = [NSCalendar currentCalendar];
    return [theCalendar dateByAddingComponents:dayComponent toDate:self options:0];
}

-(NSString *)getDayOfWeekShortString
{
    static NSDateFormatter *shortDayOfWeekFormatter;
    if(!shortDayOfWeekFormatter){
        shortDayOfWeekFormatter = [[NSDateFormatter alloc] init];
        //danson 显示星期几的文字类型
        NSLocale* zh_CN = [[NSLocale alloc] initWithLocaleIdentifier:@"zh_CN"];
        [shortDayOfWeekFormatter setLocale:zh_CN];
        [shortDayOfWeekFormatter setDateFormat:@"E"];
    }
    return [shortDayOfWeekFormatter stringFromDate:self];
}

-(NSString *)getDateOfMonth
{
    static NSDateFormatter *dateFormaater;
    if(!dateFormaater){
        dateFormaater = [[NSDateFormatter alloc] init];
        NSLocale* en_AU_POSIX = [[NSLocale alloc] initWithLocaleIdentifier:@"en_AU_POSIX"];
        [dateFormaater setLocale:en_AU_POSIX];
        [dateFormaater setDateFormat:@"d"];
    }
    return [dateFormaater stringFromDate:self];
}

- (NSDate*)midnightDate {
	return [[NSCalendar currentCalendar] dateFromComponents:[[NSCalendar currentCalendar] components:(NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay) fromDate:self]];
}
-(BOOL) isSameDateWith: (NSDate *)dt{
    return  ([[self midnightDate] isEqualToDate: [dt midnightDate]])?YES:NO;
}
- (BOOL)isDateToday {
    return [[[NSDate date] midnightDate] isEqual:[self midnightDate]];
}
- (BOOL)isWithinDate: (NSDate *)earlierDate toDate:(NSDate *)laterDate
{
    NSTimeInterval timestamp = [[self midnightDate] timeIntervalSince1970];
    NSDate *fdt = [earlierDate midnightDate];
    NSDate *tdt = [laterDate midnightDate];
    
    BOOL isWithinDate = (timestamp >= [fdt timeIntervalSince1970] && timestamp <= [tdt timeIntervalSince1970]);
    
    return isWithinDate;
    
}
- (BOOL)isPastDate {
    NSDate* now = [NSDate date];
    if([[now earlierDate:self] isEqualToDate:self]) {
        return YES;
    } else {
        return NO;
    }
}
@end

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