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@interface Person : NSObject

- (instancetype)initwithSalutation:(NSString *)salutation firstName:(NSString *)firstName lastName:(NSString *)lastName birthdate:(NSDate *)birthdate;

@property (nonatomic, copy, readonly) NSString *salutation;
@property (nonatomic, copy, readonly) NSString *firstName;
@property (nonatomic, copy, readonly) NSString *lastName;
@property (nonatomic, copy, readonly) NSDate *birthdate;

@end

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- (void)viewDidLoad {
    [super viewDidLoad];

    if (self.model.salutation.length > 0) {
        self.nameLabel.text = [NSString stringWithFormat:@"%@ %@ %@", self.model.salutation, self.model.firstName, self.model.lastName];
    } else {
        self.nameLabel.text = [NSString stringWithFormat:@"%@ %@", self.model.firstName, self.model.lastName];
    }

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"EEEE MMMM d, yyyy"];
    self.birthdateLabel.text = [dateFormatter stringFromDate:model.birthdate];
}

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@interface PersonViewModel : NSObject

- (instancetype)initWithPerson:(Person *)person;

@property (nonatomic, strong, readonly) Person *person;
@property (nonatomic, copy, readonly) NSString *nameText;
@property (nonatomic, copy, readonly) NSString *birthdateText;

@end

@implementation PersonViewModel

- (instancetype)initWithPerson:(Person *)person {
    self = [super init];
    if (self) {
       _person = person;
  
      if (person.salutation.length > 0) {
          _nameText = [NSString stringWithFormat:@"%@ %@ %@", self.person.salutation, self.person.firstName, self.person.lastName];
      } else {
          _nameText = [NSString stringWithFormat:@"%@ %@", self.person.firstName, self.person.lastName];
      }
  
      NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
      [dateFormatter setDateFormat:@"EEEE MMMM d, yyyy"];
      _birthdateText = [dateFormatter stringFromDate:person.birthdate];
    }
    return self;
}

@end

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- (void)viewDidLoad {
    [super viewDidLoad];

    self.nameLabel.text = self.viewModel.nameText;
    self.birthdateLabel.text = self.viewModel.birthdateText;
}

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SpecBegin(Person)
    NSString *salutation = @"Dr.";
    NSString *firstName = @"first";
    NSString *lastName = @"last";
    NSDate *birthdate = [NSDate dateWithTimeIntervalSince1970:0];

    it (@"should use the salutation available. ", ^{
        Person *person = [[Person alloc] initWithSalutation:salutation firstName:firstName lastName:lastName birthdate:birthdate];
        PersonViewModel *viewModel = [[PersonViewModel alloc] initWithPerson:person];
        expect(viewModel.nameText).to.equal(@"Dr. first last");
    });

    it (@"should not use an unavailable salutation. ", ^{
        Person *person = [[Person alloc] initWithSalutation:nil firstName:firstName lastName:lastName birthdate:birthdate];
        PersonViewModel *viewModel = [[PersonViewModel alloc] initWithPerson:person];
        expect(viewModel.nameText).to.equal(@"first last");
    });

    it (@"should use the correct date format. ", ^{
        Person *person = [[Person alloc] initWithSalutation:nil firstName:firstName lastName:lastName birthdate:birthdate];
        PersonViewModel *viewModel = [[PersonViewModel alloc] initWithPerson:person];
        expect(viewModel.birthdateText).to.equal(@"Thursday January 1, 1970");
    });
SpecEnd

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@protocol MRCNavigationProtocol <NSObject>

- (void)pushViewModel:(MRCViewModel *)viewModel animated:(BOOL)animated;

- (void)popViewModelAnimated:(BOOL)animated;

- (void)popToRootViewModelAnimated:(BOOL)animated;

- (void)presentViewModel:(MRCViewModel *)viewModel animated:(BOOL)animated completion:(VoidBlock)completion;

- (void)dismissViewModelAnimated:(BOOL)animated completion:(VoidBlock)completion;

- (void)resetRootViewModel:(MRCViewModel *)viewModel;

@end

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- (void)pushViewModel:(MRCViewModel *)viewModel animated:(BOOL)animated {}

- (void)popViewModelAnimated:(BOOL)animated {}

- (void)popToRootViewModelAnimated:(BOOL)animated {}

- (void)presentViewModel:(MRCViewModel *)viewModel animated:(BOOL)animated completion:(VoidBlock)completion {}

- (void)dismissViewModelAnimated:(BOOL)animated completion:(VoidBlock)completion {}

- (void)resetRootViewModel:(MRCViewModel *)viewModel {}

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- (void)registerNavigationHooks {
    @weakify(self)
    [[(NSObject *)self.services
        rac_signalForSelector:@selector(pushViewModel:animated:)]
        subscribeNext:^(RACTuple *tuple) {
            @strongify(self)
            UIViewController *viewController = (UIViewController *)[MRCRouter.sharedInstance viewControllerForViewModel:tuple.first];
            [self.navigationControllers.lastObject pushViewController:viewController animated:[tuple.second boolValue]];
        }];

    [[(NSObject *)self.services
        rac_signalForSelector:@selector(popViewModelAnimated:)]
        subscribeNext:^(RACTuple *tuple) {
          @strongify(self)
            [self.navigationControllers.lastObject popViewControllerAnimated:[tuple.first boolValue]];
        }];

    [[(NSObject *)self.services
        rac_signalForSelector:@selector(popToRootViewModelAnimated:)]
        subscribeNext:^(RACTuple *tuple) {
            @strongify(self)
            [self.navigationControllers.lastObject popToRootViewControllerAnimated:[tuple.first boolValue]];
        }];

    [[(NSObject *)self.services
        rac_signalForSelector:@selector(presentViewModel:animated:completion:)]
        subscribeNext:^(RACTuple *tuple) {
          @strongify(self)
            UIViewController *viewController = (UIViewController *)[MRCRouter.sharedInstance viewControllerForViewModel:tuple.first];

            UINavigationController *presentingViewController = self.navigationControllers.lastObject;
            if (![viewController isKindOfClass:UINavigationController.class]) {
                viewController = [[MRCNavigationController alloc] initWithRootViewController:viewController];
            }
            [self pushNavigationController:(UINavigationController *)viewController];

            [presentingViewController presentViewController:viewController animated:[tuple.second boolValue] completion:tuple.third];
        }];

    [[(NSObject *)self.services
        rac_signalForSelector:@selector(dismissViewModelAnimated:completion:)]
        subscribeNext:^(RACTuple *tuple) {
            @strongify(self)
            [self popNavigationController];
            [self.navigationControllers.lastObject dismissViewControllerAnimated:[tuple.first boolValue] completion:tuple.second];
        }];

    [[(NSObject *)self.services
        rac_signalForSelector:@selector(resetRootViewModel:)]
        subscribeNext:^(RACTuple *tuple) {
            @strongify(self)
            [self.navigationControllers removeAllObjects];

            UIViewController *viewController = (UIViewController *)[MRCRouter.sharedInstance viewControllerForViewModel:tuple.first];

            if (![viewController isKindOfClass:[UINavigationController class]]) {
                viewController = [[MRCNavigationController alloc] initWithRootViewController:viewController];
                ((UINavigationController *)viewController).delegate = self;
                [self pushNavigationController:(UINavigationController *)viewController];
            }

            MRCSharedAppDelegate.window.rootViewController = viewController;
        }];
}

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- (MRCViewController *)viewControllerForViewModel:(MRCViewModel *)viewModel {
    NSString *viewController = self.viewModelViewMappings[NSStringFromClass(viewModel.class)];

    NSParameterAssert([NSClassFromString(viewController) isSubclassOfClass:[MRCViewController class]]);
    NSParameterAssert([NSClassFromString(viewController) instancesRespondToSelector:@selector(initWithViewModel:)]);

    return [[NSClassFromString(viewController) alloc] initWithViewModel:viewModel];
}

- (NSDictionary *)viewModelViewMappings {
    return @{
      @"MRCLoginViewModel": @"MRCLoginViewController",
        @"MRCHomepageViewModel": @"MRCHomepageViewController",
        @"MRCRepoDetailViewModel": @"MRCRepoDetailViewController",
        ...
    };
}

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@interface MRCLoginViewModel : MRCViewModel

@property (nonatomic, copy, readonly) NSURL *avatarURL;
@property (nonatomic, copy) NSString *username;
@property (nonatomic, copy) NSString *password;

@property (nonatomic, strong, readonly) RACSignal *validLoginSignal;
@property (nonatomic, strong, readonly) RACCommand *loginCommand;
@property (nonatomic, strong, readonly) RACCommand *browserLoginCommand;

@end

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@implementation MRCLoginViewModel

- (void)initialize {
    [super initialize];

    RAC(self, avatarURL) = [[RACObserve(self, username)
        map:^(NSString *username) {
            return [[OCTUser mrc_fetchUserWithRawLogin:username] avatarURL];
        }]
        distinctUntilChanged];

    self.validLoginSignal = [[RACSignal
      combineLatest:@[ RACObserve(self, username), RACObserve(self, password) ]
        reduce:^(NSString *username, NSString *password) {
          return @(username.length > 0 && password.length > 0);
        }]
        distinctUntilChanged];

    @weakify(self)
    void (^doNext)(OCTClient *) = ^(OCTClient *authenticatedClient) {
        @strongify(self)
        MRCHomepageViewModel *viewModel = [[MRCHomepageViewModel alloc] initWithServices:self.services params:nil];
        dispatch_async(dispatch_get_main_queue(), ^{
            [self.services resetRootViewModel:viewModel];
        });
    };

    [OCTClient setClientID:MRC_CLIENT_ID clientSecret:MRC_CLIENT_SECRET];

    self.loginCommand = [[RACCommand alloc] initWithSignalBlock:^(NSString *oneTimePassword) {
      @strongify(self)
        OCTUser *user = [OCTUser userWithRawLogin:self.username server:OCTServer.dotComServer];
        return [[OCTClient
          signInAsUser:user password:self.password oneTimePassword:oneTimePassword scopes:OCTClientAuthorizationScopesUser | OCTClientAuthorizationScopesRepository note:nil noteURL:nil fingerprint:nil]
            doNext:doNext];
    }];

    self.browserLoginCommand = [[RACCommand alloc] initWithSignalBlock:^(id input) {
        return [[OCTClient
          signInToServerUsingWebBrowser:OCTServer.dotComServer scopes:OCTClientAuthorizationScopesUser | OCTClientAuthorizationScopesRepository]
            doNext:doNext];
    }];
}

@end

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@implementation MRCLoginViewController

- (void)bindViewModel {
    [super bindViewModel];

    @weakify(self)
    [RACObserve(self.viewModel, avatarURL) subscribeNext:^(NSURL *avatarURL) {
      @strongify(self)
        [self.avatarButton sd_setImageWithURL:avatarURL forState:UIControlStateNormal placeholderImage:[UIImage imageNamed:@"default-avatar"]];
    }];

    RAC(self.viewModel, username)  = self.usernameTextField.rac_textSignal;
    RAC(self.viewModel, password)  = self.passwordTextField.rac_textSignal;
    RAC(self.loginButton, enabled) = self.viewModel.validLoginSignal;

    [[self.loginButton
        rac_signalForControlEvents:UIControlEventTouchUpInside]
        subscribeNext:^(id x) {
            @strongify(self)
            [self.viewModel.loginCommand execute:nil];
        }];

    [[self.browserLoginButton
        rac_signalForControlEvents:UIControlEventTouchUpInside]
        subscribeNext:^(id x) {
            @strongify(self)
            NSString *message = [NSString stringWithFormat:@"“%@” wants to open “Safari”", MRC_APP_NAME];

            UIAlertController *alertController = [UIAlertController alertControllerWithTitle:nil
                                                                                     message:message
                                                                              preferredStyle:UIAlertControllerStyleAlert];

            [alertController addAction:[UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel handler:NULL]];
            [alertController addAction:[UIAlertAction actionWithTitle:@"Open" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
                @strongify(self)
                [self.viewModel.browserLoginCommand execute:nil];
            }]];

            [self presentViewController:alertController animated:YES completion:NULL];
        }];
}

@end