#import "CoreDataViewController.h"

#import "JSONModelLib.h"

#import "ReposModel.h"

#import "GitHubRepoModel.h"

#import <CoreData/CoreData.h>

#import "GitHubRepoEntity.h"

@interface CoreDataViewController () <UITableViewDataSource, UITableViewDelegate>

@property (strong, nonatomic) NSManagedObjectContext *managedObjectContext;

@property (strong, nonatomic) NSManagedObjectModel *managedObjectModel;

@property (strong, nonatomic) NSPersistentStoreCoordinator *persistentStoreCoordinator;

- (void)saveContext;

- (NSURL *)applicationDocumentsDirectory;

@property (strong, nonatomic) NSMutableArray* entities;

@property (strong, nonatomic) ReposModel* repos;

@property (strong, nonatomic) IBOutlet UITableView* tableView;

@implementation CoreDataViewController

#pragma mark - Core Data

- (void)saveContext

{

NSError *error = nil;

NSManagedObjectContext *managedObjectContext = self.managedObjectContext;

if (managedObjectContext != nil)

{

if ([managedObjectContext hasChanges] & ![managedObjectContext save:&error])

{

NSLog(@"Unresolved error %@, %@", error, [error userInfo]);

abort();

}

}

}

- (NSManagedObjectContext *)managedObjectContext

{

if (_managedObjectContext != nil)

{

return _managedObjectContext;

}

NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator];

if (coordinator != nil)

{

_managedObjectContext = [[NSManagedObjectContext alloc] init];

[_managedObjectContext setPersistentStoreCoordinator:coordinator];

}

return _managedObjectContext;

}

- (NSManagedObjectModel *)managedObjectModel

{

if (_managedObjectModel != nil)

{

return _managedObjectModel;

}

NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"github" withExtension:@"momd"];

_managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL];

return _managedObjectModel;

}

- (NSPersistentStoreCoordinator *)persistentStoreCoordinator

{

if (_persistentStoreCoordinator != nil)

{

return _persistentStoreCoordinator;

}

NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"github.sqlite"];

NSError *error = nil;

_persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];

if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&error])

{

NSLog(@"Unresolved error %@, %@", error, [error userInfo]);

abort();

}

return _persistentStoreCoordinator;

}

- (NSURL *)applicationDocumentsDirectory

{

return [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];

}

#pragma mark - view controller life cycle

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

{

self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

if (self) {

// Custom initialization

}

return self;

}

- (void)viewDidLoad

{

[super viewDidLoad];

self.entities = [@[] mutableCopy];

//setup core data

[self managedObjectContext];

//delete all entities

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

[entitiesRequest setEntity:[NSEntityDescription entityForName: [[GitHubRepoEntity class] description]

inManagedObjectContext: self.managedObjectContext]];

[entitiesRequest setIncludesPropertyValues:NO];

for (GitHubRepoEntity* repo in [self.managedObjectContext executeFetchRequest:entitiesRequest error:nil]) {

[self.managedObjectContext deleteObject:repo];

}

[self saveContext];

//import the json

NSString* filePath = [[NSBundle bundleForClass:[JSONModel class]].resourcePath stringByAppendingPathComponent:@"github-iphone.json"];

NSString* jsonContents = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];

NSError* err;

self.repos = [[ReposModel alloc] initWithString: jsonContents error:&err];

//setup UI

self.title = @"CoreData Demo";

self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Import next repo" style:UIBarButtonItemStylePlain target:self action:@selector(importJSON)];

}

-(void)importJSON

{

//get next repo to import

GitHubRepoModel* model = self.repos.repositories.firstObject;

[self.repos.repositories removeObjectAtIndex:0];

//create an entity for next repo

NSError* error = nil;

GitHubRepoEntity* entity = [GitHubRepoEntity entityWithModel:model

inContext:self.managedObjectContext

error:&error];

if (entity) {

[self.entities addObject: entity];

[self saveContext];

[self.tableView reloadData];

} else {

NSLog(@"Error importing JSON: %@", error);

}

}

#pragma mark - table stuff

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView

{

return 1;

}

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

{

return self.entities.count;

}

-(NSString*)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section

{

return [NSString stringWithFormat:@"%lu entities", (unsigned long)self.entities.count];

}

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

{

UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:@"Cell"];

if (!cell) {

cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"Cell"];

}

GitHubRepoEntity* entity = self.entities[indexPath.row];

cell.textLabel.text = entity.name;

cell.detailTextLabel.text = [NSString stringWithFormat:@"%@ (%@) forks:%@", entity.owner, entity.language, entity.forks];

return cell;

}