/*

     File: APLAppDelegate.m

 Abstract: Application delegate that sets up the navigation controller and the root view controller.

  Version: 3.0

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 */

#import "APLAppDelegate.h"

#import "APLViewController.h"

#import "APLRegion.h"

NSTimeZone *App_defaultTimeZone;

@interface APLAppDelegate ()

@property (nonatomic) NSCalendar *calendar;

@end

@implementation APLAppDelegate

#pragma mark - Application lifecycle

- (void)applicationDidFinishLaunching:(UIApplication *)application {

    /*

     We use these images and the application's time zone a lot, they're also static, so cache them and make them available globally...

     */

    App_defaultTimeZone = [NSTimeZone defaultTimeZone];

    UINavigationController *navController = (UINavigationController *)self.window.rootViewController;

    APLViewController *rootViewController = (APLViewController *)navController.topViewController;

    rootViewController.displayList = [self displayList];

    rootViewController.calendar = [self calendar];

}

#pragma mark - Setting up the display list

- (NSArray *)displayList {

    /*

     Return an array of Region objects.

     Each object represents a geographical region.  Each region contains time zones.

     Much of the information required to display a time zone is expensive to compute, so rather than using NSTimeZone objects directly use wrapper objects that calculate the required derived values on demand and cache the results.

     */

    NSArray *knownTimeZoneNames = [NSTimeZone knownTimeZoneNames];

    NSMutableArray *regions = [NSMutableArray array];

    for (NSString *timeZoneName in knownTimeZoneNames) {

        NSArray *components = [timeZoneName componentsSeparatedByString:@"/"];

        NSString *regionName = [components objectAtIndex:0];

        APLRegion *region = [APLRegion regionNamed:regionName];

        if (region == nil) {

            region = [APLRegion newRegionWithName:regionName];

            region.calendar = [self calendar];

            [regions addObject:region];

        }

        NSTimeZone *timeZone = [[NSTimeZone alloc] initWithName:timeZoneName];

        [region addTimeZone:timeZone nameComponents:components];

    }

    NSDate *date = [NSDate date];

    // Now sort the time zones by name

    for (APLRegion *region in regions) {

        [region sortZones];

        [region setDate:date];

    }

    // Sort the regions

    NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES];

    [regions sortUsingDescriptors:@[sortDescriptor]];

    return regions;

}

- (NSCalendar *)calendar {

    if (_calendar == nil) {

        _calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];

    }

    return _calendar;

}

@end