eqn.ios/Sources/Earthquake Network/Models/EQNUser.m

//
//  EQNUser.m
//  Earthquake Network
//
//  Created by Luca Beretta on 20/09/18.
//  Copyright © 2018 Luca Beretta. All rights reserved.
//

#import "EQNUser.h"
#import "Costanti.h"
#import "EQNAccelerometroManager.h"
#import "ServerRequest.h"
#import "EQNGeneratoreURLServer.h"
#import "EQNUtility.h"
#import "EQNManager.h"


@implementation EQNUser

#pragma mark - Singleton

+ (instancetype)defaultUser
{
    static EQNUser *sharedInstance = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        sharedInstance = [[self alloc] init];
    });
    return sharedInstance;
}

#pragma mark - Init

- (instancetype)init
{
    self = [super init];
    if (self) {
        _tokenUser = [[NSUserDefaults standardUserDefaults] objectForKey:EQNUserDefaultUserFirebaseToken];
        id savedUserId = [[NSUserDefaults standardUserDefaults] objectForKey:EQNUserDefaultUserId];
        _user_ID = [self convertUserIdIntoString:savedUserId];
        
        NSArray *lastPosArray = [EQNUtility loadArrayOfClass:[CLLocation class] fromUserDefaultsForKey:EQNUserDefaultLastLocation];
        if (lastPosArray.count > 0) {
            _lastPosition = [lastPosArray lastObject];
        }
        
        _registrato = NO;
        if (_user_ID) {
            _registrato = YES;
        }
        
        [[EQNAccelerometroManager sharedInstance] addObserver:(id)self
                                                   forKeyPath:@"currentLocation"
                                                      options:NSKeyValueObservingOptionNew
                                                      context:nil];
        
        [[EQNAccelerometroManager sharedInstance] startUpdatingLocationBackground];
    }
    return self;
}

#pragma mark - Accessories

- (void)setTokenUser:(NSString *)tokenUser
{
    // token could be retrieved after some times
    // thanks to this, we force the server registration when the token is received
    _tokenUser = tokenUser;
    [[NSUserDefaults standardUserDefaults] setObject:tokenUser forKey:EQNUserDefaultUserFirebaseToken];
    [self verificaRegistrazione];
}

#pragma mark - Public

- (void)saveUserInfo
{
    [[NSUserDefaults standardUserDefaults] setObject:self.tokenUser forKey:EQNUserDefaultUserFirebaseToken];
    [[NSUserDefaults standardUserDefaults] setObject:self.user_ID forKey:EQNUserDefaultUserId];
    if (self.lastPosition) {
        NSArray *lastPosiArray = @[self.lastPosition];
        [EQNUtility storeArray:lastPosiArray toUserDefaultForKey:EQNUserDefaultLastLocation];
    }
}

- (void)removeUser
{
    [[NSUserDefaults standardUserDefaults] removeObjectForKey:EQNUserDefaultUserFirebaseToken];
    [[NSUserDefaults standardUserDefaults] removeObjectForKey:EQNUserDefaultUserId];
    [[NSUserDefaults standardUserDefaults] removeObjectForKey:EQNUserDefaultLastLocation];
    [[NSUserDefaults standardUserDefaults] synchronize];
    self.tokenUser = nil;
}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
    if ([keyPath isEqualToString:@"currentLocation"]) {
        // do some stuff
        if (self.lastPosition) {
            self.distanza = [self.lastPosition distanceFromLocation:[EQNAccelerometroManager sharedInstance].currentLocation];
        }
        self.lastPosition = [EQNAccelerometroManager sharedInstance].currentLocation;
        [self verificaRegistrazione];
        
        if (![EQNManager defaultManager].isBackground)
            [[EQNAccelerometroManager sharedInstance] stopUpdatingLocation];
    }
}

- (void)verificaRegistrazione
{
    if (!self.user_ID && self.tokenUser) {
        [self inviaregistrazioneServer:self.tokenUser withPosition:self.lastPosition];
    } else {
        [self inviaPosizioneServer];
    }
}

- (void)inviaregistrazioneServer:(NSString *)token withPosition:(CLLocation *)location
{
    [[ServerRequest defaultServerConnectionSingleton] inviaInformazioniAlServerWithURL:[EQNGeneratoreURLServer urlRegistrazione] richiesta:EQNTipoChiamataRegistrazione success:^(id result) {
        
        self.user_ID = [self convertUserIdIntoString:result];
        [self saveUserInfo];
        
    } failure:^(NSError *errore) {
        NSLog(@"USER_ID Error %@", errore);
        [[NSNotificationCenter defaultCenter] postNotificationName:EQNServerRegistrationDidFailNotification object:nil];
    }];
}

- (void)inviaPosizioneServer
{
    [[ServerRequest defaultServerConnectionSingleton] inviaInformazioniAlServerWithURL:[EQNGeneratoreURLServer urlPosizione] richiesta:EQNTipoChiamataPosizione success:^(id result) {
        NSLog(@"[EQNUtility] Position saved on server");
        [self saveUserInfo];
    } failure:^(NSError *error) {
        NSLog(@"[EQNUtility] Unable to save position. Error: %@", error.localizedDescription);
    }];
}

- (void)downloadOfferTimeRemainingWithCompletion:(_Nonnull timeRemainingCompletion)completionHandler
{
    NSURL *url = [EQNGeneratoreURLServer urlDownloadOfferTimeRemaining];
    [[ServerRequest defaultServerConnectionSingleton] inviaInformazioniAlServerWithURL:url richiesta:EQNTipoChiamataOfferTimeRemaining success:^(id result) {
        NSInteger timeRemaining = 0;
        if ([result isKindOfClass:[NSNumber class]]) {
            NSNumber *timeRemainingNumber = (NSNumber *)result;
            timeRemaining = [timeRemainingNumber integerValue];
        } else if ([result isKindOfClass:[NSString class]]) {
            NSString *timeRemainingString = (NSString *)result;
            timeRemaining = [timeRemainingString integerValue];
        }
        
        completionHandler(timeRemaining);
    } failure:^(NSError *error) {
        completionHandler(0);
    }];
}

#pragma mark - Private

/// user_id saved as a Number, but is used as a NSString
- (NSString *)convertUserIdIntoString:(id)userId
{
    if ([userId isKindOfClass:[NSString class]]) {
        return (NSString *)userId;
    } else if ([userId isKindOfClass:[NSNumber class]]) {
        NSNumber *userIdNumber = (NSNumber *)userId;
        return [userIdNumber stringValue];
    } else {
        return userId;
    }
}

@end