/*

     File: APLAppDelegate.m

 Abstract: Application delegate class.

  Version: 2.0

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 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

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 */

#import "APLAppDelegate.h"

@interface APLAppDelegate ()

@property (weak) IBOutlet NSTableView *mountainsTableView;

@property (weak) IBOutlet NSTextField *sentenceText;

@property (nonatomic, readonly) NSArray *mountains;

@property (nonatomic) NSArray *sortedMountains;

@end

#import "APLMountain.h"

@implementation APLAppDelegate

// mountains is a readonly property, so the instance variable isn't synthesized by default.

@synthesize mountains = _mountains;

// Configure the UI after the nib is loaded.

- (void)awakeFromNib

{

    [self resetSentence];

}

#pragma mark - Table view data source 

- (NSInteger)numberOfRowsInTableView:(NSTableView *)aTableView

{

    return [self.mountains count];

}

- (id)tableView:(NSTableView *)aTableView objectValueForTableColumn:(NSTableColumn *)aTableColumn row:(NSInteger)rowIndex

{

    id returnValue = @"";

    APLMountain *mountain = [self.sortedMountains objectAtIndex:rowIndex];

    NSString *columnID = [aTableColumn identifier];

    if ([columnID isEqualToString:kMountainNameKey]) {

        returnValue = [[mountain name] capitalizedString];

    }

    else if ([columnID isEqualToString:kMountainHeightKey]) {

        returnValue = [self stringFromHeight:[mountain height]];

    }

    else if ([columnID isEqualToString:kMountainClimbedDateKey]) {

        returnValue = [self stringWithClimbedDate:[mountain climbedDate]];

    }

    return returnValue;

}

#pragma mark - Responding to changes in the table view

- (void)tableViewSelectionDidChange:(id)notification

{

    [self resetSentence];

}

- (void)tableView:(NSTableView *)aTableView sortDescriptorsDidChange:(NSArray *)oldDescriptors

{

    self.sortedMountains = nil;

    [aTableView reloadData];

}

/*

 When the table view sorting changes, the selected row doesn't, so reset the sentence display to match the new data on that row.

 */

- (void)tableView:(NSTableView *)tableView didClickTableColumn:(NSTableColumn *)tableColumn

{

    [self resetSentence];

}

/*

 Reset the text field with a sentence for the currently selected mountain. This is localized, and two versions are used because not all mountains have a climbed date available.

 */

- (void)resetSentence

{

    NSTableView *summaryTable = self.mountainsTableView;

    NSString *sentence = @"";

    NSString *format;

    if ([summaryTable selectedRow] != -1) {

        APLMountain *mountain = (APLMountain *) [[self sortedMountains] objectAtIndex:[summaryTable selectedRow]];

        if (mountain.climbedDate != nil) {

            format = NSLocalizedStringFromTable(@"sentenceFormat", @"Mountains", @"A sentence with the mountain's name (first parameter), height (second parameter), and climbed date (third parameter)");

            sentence = [NSString stringWithFormat:format, mountain.name, [self stringFromHeight:mountain.height], [self stringWithClimbedDate:mountain.climbedDate]];

        }

        else {

            format = NSLocalizedStringFromTable(@"undatedSentenceFormat", @"Mountains", @"A sentence with the mountain's name (first parameter), and height (second parameter), but no climbed date");

            sentence = [NSString stringWithFormat:format, mountain.name, [self stringFromHeight:mountain.height]];

        }

    }

    [self.sentenceText setStringValue:sentence];

}

// Update all the UI elements.

- (void)resetAll

{

    [self resetSentence];

    [self.mountainsTableView reloadData];

}

#pragma mark - String representations of data

/*

Returns a single string expressing a mountain's height. Allow for the possibility that the user is using non-metric units. If the units are non-metric, convert the value to feet.

*/

- (NSString*)stringFromHeight:(NSNumber*)heightNumber

{

    NSString *returnValue = @"";

    if (heightNumber != nil) {

        NSString *format = @"%d";

        NSInteger height = [heightNumber integerValue];

        NSNumber *usesMetricSystem = [[NSLocale currentLocale] objectForKey:NSLocaleUsesMetricSystem];

        if (usesMetricSystem != nil && ![usesMetricSystem boolValue]) {

            // Convert the height to feet

            height = (int) ((float) height * 3.280839895);

            format = NSLocalizedStringFromTable(@"footFormat", @"Mountains", @"Use to express a height in feet");

        }

        else {

            format = NSLocalizedStringFromTable(@"meterFormat", @"Mountains", @"Use to express a height in meters");

        }

        NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];

        [formatter setNumberStyle:NSNumberFormatterDecimalStyle];

        returnValue = [NSString stringWithFormat:format, [formatter stringFromNumber:[NSNumber numberWithInteger:height]]];

    }

    return returnValue;

}

/*

 Returns a localized string expressing a mountain's climbed date.

 */

- (NSString*)stringWithClimbedDate:(NSDate*)date

{

    NSString *returnValue = @"";

    if (date != nil) {

        NSDateFormatter *formatter = [[NSDateFormatter alloc] init];

        [formatter setDateStyle:NSDateFormatterLongStyle];

        [formatter setTimeStyle:NSDateFormatterNoStyle];

        returnValue = [formatter stringFromDate:date];

    }

    // Demonstrate that descriptionWithLocale does the right thing.

    NSLog(@"%@ => %@", [date descriptionWithLocale:[NSLocale currentLocale]], returnValue);

    return returnValue;

}

#pragma mark - Responding to locale changes

/*

 It is generally unusual for a user to change their locale settings while an application is running. If they do, there may be limits to what you can do to respond. In this application, you can change the way some of the mountain data is displayed at runtime, but the mountain names and so on remain the same, as do titles on user interface items like the window and menus.

 */

- (void)applicationDidFinishLaunching:(NSNotification *)notification {

    // Register for notifications of locale changes (so we can update everything).

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(localeChanged:) name:NSCurrentLocaleDidChangeNotification object:nil];

}

- (void)localeChanged:(NSNotification *)notification

{

    [self resetAll];

}

#pragma mark - Mountain data

/*

 Allocate the mountain data only when it's needed.

 */

- (NSArray *)mountains

{

    if (_mountains == nil) {

        // Get the localized version of the data file.

        NSURL *mountainsPlistURL = [[NSBundle mainBundle] URLForResource:@"Mountains" withExtension:@"plist"];

        if (!mountainsPlistURL) {

            NSLog(@"Didn't find the mountains");

            return nil;

        }

        NSArray *mountainDictionaries = [[NSArray alloc] initWithContentsOfURL:mountainsPlistURL];

        NSMutableArray *mountainsArray = [[NSMutableArray alloc] initWithCapacity:[mountainDictionaries count]];

        for (NSDictionary *mountainDictionary in mountainDictionaries) {

            APLMountain *mountain = [APLMountain mountainWithDictionary:mountainDictionary];

            [mountainsArray addObject:mountain];

        }

        _mountains = [mountainsArray copy];

    }

    return _mountains;

}

/*

 Mountains sorted per the table view's descriptors. Note that the sort method for the name column is localizedStandardCompare:.

 */

- (NSArray*)sortedMountains

{

    if (_sortedMountains == nil) {

        _sortedMountains = [[self mountains] sortedArrayUsingDescriptors:[self.mountainsTableView sortDescriptors]];

    }

    return _sortedMountains ;

}

#pragma mark - Tidying up

- (void)dealloc

{

    [[NSNotificationCenter defaultCenter] removeObserver:self name:NSCurrentLocaleDidChangeNotification object:nil];

}

// NSApp delegate method

- (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)theApplication

{

    return YES;

}

@end