/*

 Copyright (C) 2017 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 Table view controller to allow the user to select the recipe type.

  The options are presented as items in the table view; the selected item has a check mark in the accessory view. The controller caches the index path of the selected item to avoid the need to perform repeated string comparisons after an update.

 */

#import "TypeSelectionViewController.h"

#import "Recipe.h"

@interface TypeSelectionViewController()

@property (nonatomic, strong) NSArray *recipeTypes;

@end

#pragma mark -

@implementation TypeSelectionViewController

static NSString *MyIdentifier = @"MyIdentifier";

- (void)viewWillAppear:(BOOL)animated {

    [super viewWillAppear:animated];

    self.title = NSLocalizedString(@"Category", "");

    // Right bar button item will dismiss this view controller.

    self.navigationItem.rightBarButtonItem =

    [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone

                                                  target:self

                                                  action:@selector(doneAction:)];

    // Fetch the recipe types in alphabetical order by name from the recipe's context.

    NSManagedObjectContext *context = self.recipe.managedObjectContext;

    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];

    fetchRequest.entity = [NSEntityDescription entityForName:@"RecipeType" inManagedObjectContext:context];

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

    NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:&sortDescriptor count:1];

    fetchRequest.sortDescriptors = sortDescriptors;

    NSArray *types = [context executeFetchRequest:fetchRequest error:nil];

    self.recipeTypes = types;

}

- (void)viewDidLoad {

    [super viewDidLoad];

    // Register this class for our cell to this table view under the specified identifier 'MyIdentifier'.

    [self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:MyIdentifier];

}

- (IBAction)doneAction:(id)sender {

    [self dismissViewControllerAnimated:YES completion:nil];

}

#pragma mark - UITableViewDataSource

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

    // Number of rows is the number of recipe types.

    return self.recipeTypes.count;

}

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

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier forIndexPath:indexPath];

    // Configure the cell.

    NSManagedObject *recipeType = (self.recipeTypes)[indexPath.row];

    cell.textLabel.text = [recipeType valueForKey:@"name"];

    if (recipeType == self.recipe.type) {

        cell.accessoryType = UITableViewCellAccessoryCheckmark;

    }

    return cell;

}

#pragma mark - UITableViewDelegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    // If there was a previous selection, unset the accessory view for its cell.

    NSManagedObject *currentType = self.recipe.type;

    if (currentType != nil) {

        NSInteger index = [self.recipeTypes indexOfObject:currentType];

        NSIndexPath *selectionIndexPath = [NSIndexPath indexPathForRow:index inSection:0];

        UITableViewCell *checkedCell = [tableView cellForRowAtIndexPath:selectionIndexPath];

        checkedCell.accessoryType = UITableViewCellAccessoryNone;

    }

    // Set the checkmark accessory for the selected row.

    [tableView cellForRowAtIndexPath:indexPath].accessoryType = UITableViewCellAccessoryCheckmark;    

     // Update the type of the recipe instance.

    self.recipe.type = (self.recipeTypes)[indexPath.row];

    // Deselect the row.

    [tableView deselectRowAtIndexPath:indexPath animated:YES];

}

@end