/*

 Copyright (C) 2016 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 A simple view to display various pieces of information about a time zone. Because the the view's content is fairly complex, it draws its content directly in drawRect: to optimize scolling performance.

  The implementation is very basic -- it doesn't attempt to constrain text to particular areas to aviod overlapping and so on. It does, though, illustrate response to highlighting.

 */

#import "APLTimeZoneView.h"

#import "APLTimeZoneWrapper.h"

NSUInteger DeviceSystemMajorVersion();

@interface APLTimeZoneView ()

@property (nonatomic) NSDateFormatter *dateFormatter;

@end

@implementation APLTimeZoneView

- (void)setTimeZoneWrapper:(APLTimeZoneWrapper *)newTimeZoneWrapper {

    // If the time zone wrapper changes, update the date formatter and abbreviation string.

    if (_timeZoneWrapper != newTimeZoneWrapper) {

        _timeZoneWrapper = newTimeZoneWrapper;

        self.dateFormatter.timeZone = _timeZoneWrapper.timeZone;

        self.abbreviation = [[NSString alloc] initWithFormat:@"%@ (%@)", _timeZoneWrapper.abbreviation, _timeZoneWrapper.gmtOffset];

    }

    // May be the same wrapper, but the date may have changed, so mark for redisplay.

    [self setNeedsDisplay];

}

- (void)setHighlighted:(BOOL)lit {

    // If highlighted state changes, need to redisplay.

    if (_highlighted != lit) {

        _highlighted = lit;

        [self setNeedsDisplay];

    }

}

- (void)drawRect:(CGRect)rect {

#define LEFT_COLUMN_OFFSET 10

#define MIDDLE_COLUMN_OFFSET 170

#define RIGHT_COLUMN_OFFSET 270

#define UPPER_ROW_TOP 12

#define LOWER_ROW_TOP 44

    // Color for the main text items (time zone name, time).

    UIColor *mainTextColor;

    // Color for the secondary text items (GMT offset, day).

    UIColor *secondaryTextColor;

    // Choose font color based on highlighted state.

    if (self.highlighted) {

        mainTextColor = [UIColor whiteColor];

        secondaryTextColor = [UIColor whiteColor];

    }

    else {

        mainTextColor = [UIColor blackColor];

        secondaryTextColor = [UIColor darkGrayColor];

    }

    /*

     Font attributes for the main text items (time zone name, time).

     For iOS 7 and later, use text styles instead of system fonts.

     */

    UIFont *mainFont;

    if (DeviceSystemMajorVersion() > 6) {

        mainFont = [UIFont preferredFontForTextStyle:UIFontTextStyleBody];

    }

    else {

        mainFont = [UIFont systemFontOfSize:17.0];

    }

    NSDictionary *mainTextAttributes = @{ NSFontAttributeName : mainFont, NSForegroundColorAttributeName : mainTextColor };

    // Font attributes for the secondary text items (GMT offset, day).

    UIFont *secondaryFont;

    if (DeviceSystemMajorVersion() > 6) {

        secondaryFont = [UIFont preferredFontForTextStyle:UIFontTextStyleCaption1];

    }

    else {

        secondaryFont = [UIFont systemFontOfSize:12.0];

    }

    NSDictionary *secondaryTextAttributes = @{ NSFontAttributeName : secondaryFont, NSForegroundColorAttributeName : secondaryTextColor };

    // In this example we will never be editing, but this illustrates the appropriate pattern.

    if (!self.editing) {

        CGPoint point;

        /*

         Draw the locale name top left.

        */

        NSAttributedString *localeNameAttributedString = [[NSAttributedString alloc] initWithString:self.timeZoneWrapper.timeZoneLocaleName attributes:mainTextAttributes];

        point = CGPointMake(LEFT_COLUMN_OFFSET, UPPER_ROW_TOP);

        [localeNameAttributedString drawAtPoint:point];

        /*

         Draw the current time in the middle column.

         */

        NSString *timeString = [self.dateFormatter stringFromDate:[NSDate date]];

        NSAttributedString *timeAttributedString = [[NSAttributedString alloc] initWithString:timeString attributes:mainTextAttributes];

        point = CGPointMake(MIDDLE_COLUMN_OFFSET, UPPER_ROW_TOP);

        [timeAttributedString drawAtPoint:point];

        /*

         Draw the abbreviation botton left.

         */

        NSAttributedString *abbreviationAttributedString = [[NSAttributedString alloc] initWithString:self.abbreviation attributes:secondaryTextAttributes];

        point = CGPointMake(LEFT_COLUMN_OFFSET, LOWER_ROW_TOP);

        [abbreviationAttributedString drawAtPoint:point];

        /*

         Draw the whichDay string.

         */

        APLTimeZoneWrapper *timeZoneWrapper = self.timeZoneWrapper;

        NSAttributedString *whichDayAttributedString = [[NSAttributedString alloc] initWithString:timeZoneWrapper.whichDay attributes:secondaryTextAttributes];

        point = CGPointMake(MIDDLE_COLUMN_OFFSET, LOWER_ROW_TOP);

        [whichDayAttributedString drawAtPoint:point];

        // Draw the quarter image.

        CGFloat imageY = (self.bounds.size.height - self.timeZoneWrapper.image.size.height) / 2;

        point = CGPointMake(RIGHT_COLUMN_OFFSET, imageY);

        [timeZoneWrapper.image drawAtPoint:point];

    }

}

-(NSDateFormatter *)dateFormatter

{

    if (!_dateFormatter) {

        _dateFormatter = [[NSDateFormatter alloc] init];

        NSString *dateFormat = [NSDateFormatter dateFormatFromTemplate:@"h:mm a" options:0 locale:[NSLocale currentLocale]];

        _dateFormatter.dateFormat = dateFormat;

    }

    return _dateFormatter;

}

@end

NSUInteger DeviceSystemMajorVersion() {

    static NSUInteger _deviceSystemMajorVersion = -1;

    static dispatch_once_t onceToken;

    dispatch_once(&onceToken, ^{

        _deviceSystemMajorVersion = [[UIDevice currentDevice].systemVersion componentsSeparatedByString:@"."][0].integerValue;

    });

    return _deviceSystemMajorVersion;

}