/*

     File: APLAppDelegate.m

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

  Version: 3.0

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 */

#import "APLAppDelegate.h"

#import "APLViewController.h"

#import "APLRegion.h"

@implementation APLAppDelegate

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

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

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

    NSCalendar *calendar= [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];

    rootViewController.calendar = calendar;

    rootViewController.displayList = [self regionsWithCalendar:calendar];

}

- (NSArray *)regionsWithCalendar:(NSCalendar *)calendar {

    /*

     Create 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 alloc] init];

    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 = calendar;

            [regions addObject:region];

        }

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

        [region addTimeZone:timeZone nameComponents:components];

    }

    // Now sort the time zones by name.

    NSDate *date = [[NSDate alloc] init];

    for (APLRegion *region in regions) {

        [region sortZones];

        [region setDate:date];

    }

    // Sort the regions by name.

    NSArray *sortedRegions = [regions sortedArrayUsingComparator:^(id region1, id region2) {

        NSString *name1 = [(APLRegion *)region1 name];

        NSString *name2 = [(APLRegion *)region2 name];

        // Do comparison

        return [name1 localizedStandardCompare:name2];

    }];

    return sortedRegions;

}

@end