/*

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

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    A UIViewController subclass that manages the selection of a food item.

*/

#import "AAPLFoodPickerViewController.h"

#import "AAPLFoodItem.h"

NSString *const AAPLFoodPickerViewControllerTableViewCellIdentifier = @"cell";

NSString *const AAPLFoodPickerViewControllerUnwindSegueIdentifier = @"AAPLFoodPickerViewControllerUnwindSegueIdentifier";

@interface AAPLFoodPickerViewController()

@property (nonatomic, strong) NSArray *foodItems;

@end

@implementation AAPLFoodPickerViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    // A hard-coded list of possible food items. In your application, you can decide how these should

    // be represented / created.

    self.foodItems = @[

        [AAPLFoodItem foodItemWithName:@"Wheat Bagel" joules:240000.0],

        [AAPLFoodItem foodItemWithName:@"Bran with Raisins" joules:190000.0],

        [AAPLFoodItem foodItemWithName:@"Regular Instant Coffee" joules:1000.0],

        [AAPLFoodItem foodItemWithName:@"Banana" joules:439320.0],

        [AAPLFoodItem foodItemWithName:@"Cranberry Bagel" joules:416000.0],

        [AAPLFoodItem foodItemWithName:@"Oatmeal" joules:150000.0],

        [AAPLFoodItem foodItemWithName:@"Fruits Salad" joules:60000.0],

        [AAPLFoodItem foodItemWithName:@"Fried Sea Bass" joules:200000.0],

        [AAPLFoodItem foodItemWithName:@"Chips" joules:190000.0],

        [AAPLFoodItem foodItemWithName:@"Chicken Taco" joules:170000.0]

    ];

}

#pragma mark - UITableViewDataSource

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

    return self.foodItems.count;

}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    return [tableView dequeueReusableCellWithIdentifier:AAPLFoodPickerViewControllerTableViewCellIdentifier forIndexPath:indexPath];

}

- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {

    AAPLFoodItem *foodItem = self.foodItems[indexPath.row];

    cell.textLabel.text = foodItem.name;

    NSEnergyFormatter *energyFormatter = [self energyFormatter];

    cell.detailTextLabel.text = [energyFormatter stringFromJoules:foodItem.joules];

}

#pragma mark - Convenience

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    if ([segue.identifier isEqualToString:AAPLFoodPickerViewControllerUnwindSegueIdentifier]) {

        NSIndexPath *indexPathForSelectedRow = self.tableView.indexPathForSelectedRow;

        self.selectedFoodItem = self.foodItems[indexPathForSelectedRow.row];

    }

}

- (NSEnergyFormatter *)energyFormatter {

    static NSEnergyFormatter *energyFormatter;

    static dispatch_once_t onceToken;

    dispatch_once(&onceToken, ^{

        energyFormatter = [[NSEnergyFormatter alloc] init];

        energyFormatter.unitStyle = NSFormattingUnitStyleLong;

        energyFormatter.forFoodEnergyUse = YES;

        energyFormatter.numberFormatter.maximumFractionDigits = 2;

    });

    return energyFormatter;

}

@end