#import "ViewController.h"

@interface ViewController ()

@property (strong, nonatomic) IBOutlet CLLocationManager *locationManager;
@property (strong, nonatomic) IBOutlet NSUUID *proximityUUID;
@property (strong, nonatomic) IBOutlet CLBeaconRegion *beaconRegion;
@property (strong, nonatomic) IBOutlet CLBeacon *nearestBeacon;
@property (strong, nonatomic) IBOutlet NSString *str;

@end

@implementation ViewController

<省略>

- (void)viewDidLoad
{
  [super viewDidLoad];

  if ([CLLocationManager isMonitoringAvailableForClass:[CLCircularRegion class]]) {
      self.locationManager = [[CLLocationManager alloc] init];
      self.locationManager.delegate = self;
      
      self.proximityUUID = [[NSUUID alloc] initWithUUIDString:@"8D4DB809-032F-4771-96F3-99BD5C25F924"];
      self.beaconRegion = [[CLBeaconRegion alloc] initWithProximityUUID: self.proximityUUID
                                                               identifier:@"com.kato.ibeaconSample"];

      if ([self.locationManager respondsToSelector:@selector(requestAlwaysAuthorization)]) {
          // requestAlwaysAuthorizationメソッドが利用できる場合(iOS8以上の場合)
          // 位置情報の取得許可を求めるメソッド
          [self.locationManager requestAlwaysAuthorization];
      } else {
          // requestAlwaysAuthorizationメソッドが利用できない場合(iOS8未満の場合)
          [self.locationManager startMonitoringForRegion: self.beaconRegion];
      }
  } else {
      // iBeaconが利用できない端末の場合
      NSLog(@"iBeaconを利用できません。");
  }
}

// ユーザの位置情報の許可状態を確認するメソッド
- (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status
{
  if (status == kCLAuthorizationStatusNotDetermined) {
      // ユーザが位置情報の使用を許可していない
  } else if(status == kCLAuthorizationStatusAuthorizedAlways) {
      // ユーザが位置情報の使用を常に許可している場合
      [self.locationManager startMonitoringForRegion: self.beaconRegion];
  } else if(status == kCLAuthorizationStatusAuthorizedWhenInUse) {
      // ユーザが位置情報の使用を使用中のみ許可している場合
      [self.locationManager startMonitoringForRegion: self.beaconRegion];
  }
}

// 領域計測が開始した場合
- (void)locationManager:(CLLocationManager *)manager didStartMonitoringForRegion:(CLRegion *)region
{
  [self sendLocalNotificationForMessage:@"Start Monitoring Region"];
}

// 指定した領域に入った場合
- (void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region
{
  [self sendLocalNotificationForMessage:@"Enter Region"];
      
  if ([region isMemberOfClass:[CLBeaconRegion class]] && [CLLocationManager isRangingAvailable]) {
      [self.locationManager startRangingBeaconsInRegion:(CLBeaconRegion *)region];
  }
}

// 指定した領域から出た場合
- (void)locationManager:(CLLocationManager *)manager didExitRegion:(CLRegion *)region
{
  [self sendLocalNotificationForMessage:@"Exit Region"];
      
  if ([region isMemberOfClass:[CLBeaconRegion class]] && [CLLocationManager isRangingAvailable]) {
      [self.locationManager stopRangingBeaconsInRegion:(CLBeaconRegion *)region];
  }
}

// 領域内にいるかどうかを確認する処理
-(void)locationManager:(CLLocationManager *)manager didDetermineState:(CLRegionState)state forRegion:(CLRegion *)region{
  switch (state) {
      case CLRegionStateInside:
          if([region isMemberOfClass:[CLBeaconRegion class]] && [CLLocationManager isRangingAvailable]){
              NSLog(@"Enter %@",region.identifier);
              //Beacon の範囲内に入った時に行う処理を記述する
              [self sendLocalNotificationForMessage:@"Already Entering"];
          }
          break;

      case CLRegionStateOutside:
      case CLRegionStateUnknown:
      default:
          break;
  }
}

// Beacon信号を検出した場合
- (void)locationManager:(CLLocationManager *)manager didRangeBeacons:(NSArray *)beacons inRegion:(CLBeaconRegion *)region
{
  if (beacons.count > 0) {
      self.nearestBeacon = beacons.firstObject;
      self.str = [[NSString alloc] initWithFormat:@"%f [m]", self.nearestBeacon.accuracy];
      NSLog(@"%@", self.str);
      [self sendLocalNotificationForMessage:self.str];
  }
}

// ローカルプッシュ処理
- (void)sendLocalNotificationForMessage:(NSString *)message
{
  UILocalNotification *localNotification = [UILocalNotification new];
  localNotification.alertBody = message;
  localNotification.fireDate = [NSDate date];
  localNotification.soundName = UILocalNotificationDefaultSoundName;
  [UIApplication sharedApplication] scheduleLocalNotification:localNotification];]
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
  <省略>

  if ([UIApplication instancesRespondToSelector:@selector(registerUserNotificationSettings:)]) {
      [[UIApplication sharedApplication] registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeAlert|UIUserNotificationTypeSound categories:nil]];
  }

  return YES;
}