ResearchKit/ResearchKitUI/Common/Answer Format/Control Views/ORKDateTimePicker.m

/*
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 are permitted provided that the following conditions are met:
 
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 list of conditions and the following disclaimer.
 
 2.  Redistributions in binary form must reproduce the above copyright notice,
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 3.  Neither the name of the copyright holder(s) nor the names of any contributors
 may be used to endorse or promote products derived from this software without
 specific prior written permission. No license is granted to the trademarks of
 the copyright holders even if such marks are included in this software.
 
 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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 */


#import "ORKDateTimePicker.h"

#import "ORKAnswerFormat_Internal.h"

#import "ORKHelpers_Internal.h"


@interface ORKDateTimePicker ()

@property (nonatomic, strong) ORKAnswerFormat *answerFormat;
@property (nonatomic, strong) NSCalendar *calendar;

@end


@implementation ORKDateTimePicker {
    NSDateFormatter *_labelFormatter;
    UIDatePicker *_pickerView;
    NSDate *_date;
    NSInteger _minuteInterval;
    __weak id<ORKPickerDelegate> _pickerDelegate;
    id _answer;
}

@synthesize pickerDelegate = _pickerDelegate;
@synthesize answer = _answer;

- (instancetype)initWithAnswerFormat:(ORKAnswerFormat *)answerFormat answer:(id)answer pickerDelegate:(id<ORKPickerDelegate>)delegate {
    self = [super init];
    if (self) {
        
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(currentLocaleDidChange:) name:NSCurrentLocaleDidChangeNotification object:nil];
        
        self.answerFormat = answerFormat;
        self.answer = answer;
        self.pickerDelegate = delegate;
        
    }
    return self;
}

- (UIDatePicker *)pickerView {
    if (_pickerView == nil) {
        _pickerView = [[UIDatePicker alloc] init];
        [_pickerView addTarget:self action:@selector(valueDidChange:) forControlEvents:UIControlEventValueChanged];
        if (@available(iOS 13.4, *)) {
            _pickerView.preferredDatePickerStyle = UIDatePickerStyleWheels;
        }
        self.answerFormat = _answerFormat;
        self.answer = _answer;
    }
    return _pickerView;
}

- (void)setAnswer:(id)answer {
    _answer = answer;
    
    if (answer == [ORKDontKnowAnswer answer]) {
        return;
    }
    
    if ([self isTimeOfDay]) {
        ORKTimeOfDayAnswerFormat *timeOfDayAnswerFormat = (ORKTimeOfDayAnswerFormat *)self.answerFormat;
        [self setMinuteInterval:timeOfDayAnswerFormat.minuteInterval];
        
        if (answer && answer != ORKNullAnswerValue()) {
            NSDateComponents *timeOfDayComponents = (NSDateComponents *)answer;
            
            NSDate *dateValue = ORKTimeOfDayDateFromComponents(timeOfDayComponents);
            [self setDate:dateValue];
            
        } else {
            [self setDate:[timeOfDayAnswerFormat pickerDefaultDate]];
        }
    } else {
        ORKDateAnswerFormat *dateAnswerFormat = (ORKDateAnswerFormat *)self.answerFormat;
        [self setMinuteInterval:dateAnswerFormat.minuteInterval];
        
        if (answer && answer != ORKNullAnswerValue()) {
            NSDate *defaultDate = (NSDate *)answer;
            [self setDate:defaultDate];
        } else {
            NSDate *defaultDate = [dateAnswerFormat pickerDefaultDate];
            [self setDate:defaultDate];
        }
    }
}

- (void)setAnswerFormat:(ORKAnswerFormat *)answerFormat {
    ORKQuestionType questionType = answerFormat.questionType;
    int datePickerMode = -1;
    switch (questionType) {
        case ORKQuestionTypeDate:
            datePickerMode = UIDatePickerModeDate;
            break;
        case ORKQuestionTypeDateAndTime:
            datePickerMode = UIDatePickerModeDateAndTime;
            break;
        case ORKQuestionTypeTimeOfDay:
            datePickerMode = UIDatePickerModeTime;
            break;
        default:
            break;
    }
    
    NSAssert((datePickerMode >= 0), @"questionType should be Date, DateAndTime, or TimeOfDay.");
    
    _answerFormat = answerFormat;
    
    _pickerView.datePickerMode = datePickerMode;
    
    if ([self isTimeOfDay]) {
        [self setDate:[(ORKTimeOfDayAnswerFormat *)answerFormat pickerDefaultDate]];
    } else {
        ORKDateAnswerFormat *dateAnswerFormat = (ORKDateAnswerFormat *)answerFormat;
        [self setDate:[dateAnswerFormat pickerDefaultDate]];
        
        _pickerView.calendar = [dateAnswerFormat currentCalendar];
        _pickerView.timeZone = _pickerView.calendar.timeZone;
        
        _calendar = [dateAnswerFormat currentCalendar];
        
        [_pickerView setMinimumDate:[dateAnswerFormat pickerMinimumDate]];
        [_pickerView setMaximumDate:[dateAnswerFormat pickerMaximumDate]];
    }
    
    _labelFormatter = nil;
}

- (void)setDate:(NSDate *)date {
    _date = date;
    _pickerView.date = date;
}

- (void)setMinuteInterval:(NSInteger)minuteInterval {
    _minuteInterval = minuteInterval;
    _pickerView.minuteInterval = minuteInterval;
}

- (NSDateFormatter *)labelFormatter {
    if (_labelFormatter) {
        _labelFormatter.calendar = self.calendar;
        return _labelFormatter;
    }
    
    NSString *dateFormat = nil;
    switch ([self questionType]) {
        case ORKQuestionTypeDate:
            dateFormat = [NSDateFormatter dateFormatFromTemplate:@"Mdy" options:0 locale:[NSLocale currentLocale]];
            break;
        case ORKQuestionTypeDateAndTime:
            dateFormat = [NSDateFormatter dateFormatFromTemplate:@"yEMdhma" options:0 locale:[NSLocale currentLocale]];
            break;
        case ORKQuestionTypeTimeOfDay:
            dateFormat = [NSDateFormatter dateFormatFromTemplate:@"hma" options:0 locale:[NSLocale currentLocale]];
            break;
        default:
            break;
    }
    
    if (dateFormat != nil) {
        NSDateFormatter *dfm = [NSDateFormatter new];
        dfm.dateFormat = dateFormat;
        dfm.calendar = self.calendar;
        
        _labelFormatter = dfm;
    }
    
    return _labelFormatter;
}

- (NSString *)selectedLabelText {
    if (_answer == nil || _answer == ORKNullAnswerValue()) {
        return nil;
    }
    
    return [[self labelFormatter] stringFromDate:_date];
}

- (void)pickerWillAppear {
    // Report current value, since ORKTimeIntervalPicker always has a value
    [self pickerView];
    [self valueDidChange:self];
}

- (void)valueDidChange:(id)sender {
    _date = _pickerView.date;
    
    if (self.answer != [ORKDontKnowAnswer answer]) {
        
        if ([self isTimeOfDay]) {
            NSDateComponents *answer = ORKTimeOfDayComponentsFromDate([_pickerView date]);
            _answer = answer;
        } else {
            NSDate *dateAnswer = _date;
            _answer = dateAnswer;
        }
        
    }
    
    if ([self.pickerDelegate respondsToSelector:@selector(picker:answerDidChangeTo:)]) {
        [self.pickerDelegate picker:self answerDidChangeTo:self.answer];
    }
}

- (ORKQuestionType)questionType {
    return self.answerFormat.questionType;
}

- (BOOL)isTimeOfDay {
    return [self questionType] == ORKQuestionTypeTimeOfDay;
}

- (void)currentLocaleDidChange:(NSNotification *)notification {
    _labelFormatter = nil;
    [self valueDidChange:nil];
}

- (void)dealloc {
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

@end