/*

     File: APLOrderController.m

 Abstract: Controller object that manages a collection of entrees and toppings.

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#import "APLOrderController.h"

// Keys used by the Entree and Topping dictionaries

static NSString *const kItemNameKey = @"name";

static NSString *const kItemPriceKey = @"price";

@interface APLOrderController ()

// In OS x v10.8, NSTextView does not support weak references.

@property (unsafe_unretained) IBOutlet NSTextView *textView;

@property NSArray *toppings;

@property NSArray *entrees;

@end

@implementation APLOrderController

- (id)init {

    self = [super init];

    if (self) {

        // Set up entrees.

        _entrees = @[ @{ kItemNameKey : NSLocalizedString(@"Pizza", @"Pizza"), kItemPriceKey : @5.50f }, @{ kItemNameKey : NSLocalizedString(@"Calzone", @"Calzone"), kItemPriceKey : @6.75f } ];

        // Set up toppings.

        _toppings = @ [ @{ kItemNameKey: NSLocalizedString(@"Tomato", @"Tomato"), kItemPriceKey: @1.50f }, @{ kItemNameKey: NSLocalizedString(@"Cheese", @"Cheese"), kItemPriceKey: @1.75f }, @{ kItemNameKey: NSLocalizedString(@"Pepperoni", @"Pepperoni"), kItemPriceKey: @2.75f }, @{ kItemNameKey: NSLocalizedString(@"Sausage", @"Sausage"), kItemPriceKey: @2.25f } ];

    }

    return self;

}

#pragma mark - Bound methods

/*

 The following method is bound using Cocoa's binding capabilities. To see how the methods are bound, look in MainMenu.xib.

 orderEntree:withToppings: is the method invoked by the "Place your order" button -- it is set up using bindings.

 The task is to "print out" to the text view the components and total price of the current order.

 The button's bindings are as follows:

 1) 'target' is bound to [APLOrderController].self -- this uses 'self' as a key simply to return the APLOrderController instance.

 The selector (specified in the 'target' binding) is orderEntree:withToppings:, identifying this method.

 2) 'argument' is a multi-value binding:

 'argument' is [Entrees].selection -- a proxy object representing the array controller's selection. This object is passed as the first argument to orderEntree:withToppings:. The method only sends the selected object (an entree dictionary) in the entrees table view.

 'argument2' is [Toppings].selectedObjects -- the objects currently selected in the toppings table view. This array is passed as the second argument to orderEntree:withToppings:.

 */

- (void)orderEntree:(id)selectedEntree withToppings:(NSArray *)selectedToppings {

    /*

     Check that there was an entree selection (the table view should disallow empty selections, but this is a useful example).

     */

    if (NSNoSelectionMarker == [selectedEntree valueForKey:@"self"]) {

        [self appendToTextView:NSLocalizedString(@"No Entree Selected", @"No entree selected.\n\n")];

        return;

    }

    // The total price starts with the price of the entree.

    float __block totalCost = [[selectedEntree valueForKey:kItemPriceKey] floatValue];

    // If there are no toppings, end here by adding just the plain entree to the order.

    if ([selectedToppings count] == 0) {

        NSString *localizedTotalCostWithoutToppings = [NSNumberFormatter localizedStringFromNumber:@(totalCost) numberStyle:NSNumberFormatterCurrencyStyle];

        NSString *orderSummaryString = [NSString localizedStringWithFormat:NSLocalizedString(@"Plain Order Summary Format", @"Plain %@\nCost: %@\n\n"),[selectedEntree valueForKey:kItemNameKey], localizedTotalCostWithoutToppings];

        [self appendToTextView:orderSummaryString];

        return;

    }

    /*

     Build an array comprising the names of each of the selected toppings (this is used later to generate the string of components) and update the total.

     */

    NSMutableArray *toppingNames = [NSMutableArray array];

    [selectedToppings enumerateObjectsUsingBlock:^(NSDictionary *topping, NSUInteger idx, BOOL *stop) {

        [toppingNames addObject:[topping valueForKey:kItemNameKey]];

        NSNumber *toppingCostNumber = [topping valueForKey:kItemPriceKey];

        totalCost += toppingCostNumber.floatValue;

    }];

    NSString *localizedTotalCostWithToppings = [NSNumberFormatter localizedStringFromNumber:@(totalCost) numberStyle:NSNumberFormatterCurrencyStyle];

    // Create a string for the order summary and append that to the text view.

    NSString *toppingsString = [toppingNames componentsJoinedByString:NSLocalizedString(@"Toppings Separator", @", ")];

    NSString *orderSummaryString = [NSString localizedStringWithFormat:NSLocalizedString(@"Order Summary Format", @"%@ with %@\nCost: %@\n\n"), [selectedEntree valueForKey:kItemNameKey], toppingsString, localizedTotalCostWithToppings];

    [self appendToTextView:orderSummaryString];

}

#pragma mark - Private helper method

// Simple method to append a string to the text view and scroll the text view to make the latest order visible.

- (void)appendToTextView:(NSString *)stringToAppend {

    NSInteger textLength = [[self.textView textStorage] length];

    NSRange range = NSMakeRange(textLength, 0);

    [self.textView replaceCharactersInRange:range withString:stringToAppend];

    textLength = [[self.textView textStorage] length];

    range = NSMakeRange(textLength, 0);

    [self.textView scrollRangeToVisible:range];

}

@end