import UIKit

import CoreLocation

class ViewController: UIViewController , CLLocationManagerDelegate {

    var locationManager : CLLocationManager!
    var seenError : Bool = false
    var locationFixAchieved : Bool = false
    var locationStatus : NSString = "not Started"
    
    var info : UILabel?
    
    var longitudeLabel_int : UILabel?   //the longitude before the degree sign (integer section)
    var longitudeLabel_dec : UILabel?   //the longitude after the degree sign (decimal section)
    var latitudeLabel_int : UILabel?    //the latitude before the degree sign (integer section)
    var latitudeLabel_dec : UILabel?    //the latitude after the degree sign (decimal section)
    
    var O_longitude : UILabel?      //the degree sign
    var O_latitude : UILabel?       //the degree sign
    
    func initLocationManager() {
        seenError = false
        locationFixAchieved = false
        locationManager = CLLocationManager()
        
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.distanceFilter = kCLLocationAccuracyKilometer
        
        locationManager.requestAlwaysAuthorization()
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        
        let buttomEdge = UILabel(frame: CGRect(x: 0, y: 569, width: 320, height: 0.2))
        buttomEdge.backgroundColor = UIColor.redColor()
        
        let signature = UILabel(frame: CGRect(x: 160, y: 539, width: 160, height: 30))
        signature.text = "孙毅 April 25th 2015"
        signature.textColor = UIColor.whiteColor()
        
        
        info = UILabel(frame: CGRect(x: 20, y: 20, width: 300, height: 50))
        info!.textAlignment = NSTextAlignment.Center
        info!.textColor = UIColor.whiteColor()
        
        longitudeLabel_int = UILabel(frame: CGRect(x: 88, y: 150, width: 30, height: 50))
        longitudeLabel_int!.textAlignment = NSTextAlignment.Right
        longitudeLabel_int!.text = "000"
        longitudeLabel_int!.font = UIFont(name: "Times New Roman", size: 20)
        longitudeLabel_int!.textColor = UIColor.blueColor()
        
        O_longitude = UILabel(frame: CGRect(x: 120, y: 145, width: 5, height: 50))
        O_longitude!.textAlignment = NSTextAlignment.Left
        O_longitude!.text = "o"
        O_longitude!.font = UIFont(name: "Arial", size: 10)
        O_longitude!.textColor = UIColor.blueColor()
        
        longitudeLabel_dec = UILabel(frame: CGRect(x: 130, y: 150, width: 200, height: 50))
        longitudeLabel_dec!.textAlignment = NSTextAlignment.Left
        longitudeLabel_dec!.text = "000000"
        longitudeLabel_dec!.font = UIFont(name: "Times New Roman", size: 20)
        longitudeLabel_dec!.textColor = UIColor.blueColor()
        
        latitudeLabel_int = UILabel(frame: CGRect(x: 88, y: 200, width: 30, height: 50))
        latitudeLabel_int!.textAlignment = NSTextAlignment.Right
        latitudeLabel_int!.text = "000"
        latitudeLabel_int!.font = UIFont(name: "Times New Roman", size: 20)
        latitudeLabel_int!.textColor = UIColor.redColor()
        
        O_latitude = UILabel(frame: CGRect(x: 120, y: 195, width: 5, height: 50))
        O_latitude!.textAlignment = NSTextAlignment.Left
        O_latitude!.text = "o"
        O_latitude!.font = UIFont(name: "Arial", size: 10)
        O_latitude!.textColor = UIColor.redColor()
        
        latitudeLabel_dec = UILabel(frame: CGRect(x: 130, y: 200, width: 200, height: 50))
        latitudeLabel_dec!.textAlignment = NSTextAlignment.Left
        latitudeLabel_dec!.text = "000000"
        latitudeLabel_dec!.font = UIFont(name: "Times New Roman", size: 20)
        latitudeLabel_dec!.textColor = UIColor.redColor()
        
        self.initLocationManager()
        
        self.view.addSubview(info!)
        self.view.addSubview(longitudeLabel_int!)
        self.view.addSubview(O_longitude!)
        self.view.addSubview(longitudeLabel_dec!)
        self.view.addSubview(latitudeLabel_int!)
        self.view.addSubview(O_latitude!)
        self.view.addSubview(latitudeLabel_dec!)
        self.view.addSubview(buttomEdge)
        self.view.addSubview(signature)
    }
    
    func locationManager(manager: CLLocationManager!, didFailWithError error: NSError!) {
        locationManager.stopUpdatingLocation()
        if (nil != error) {
            if (false == seenError) {
                seenError = true
                info!.text = "Error"
            }
        }
    }

    func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {
        
        if (false == locationFixAchieved) {
            locationFixAchieved = true
            var locationArray = locations as NSArray
            var locationObj = locationArray.lastObject as! CLLocation
            var coordinate = locationObj.coordinate
            
            var degree : Int = 0
            var minute : Int = 0
            var second : Double = 0.0
            
            degree = Int(coordinate.longitude)
            minute = Int((coordinate.longitude - Double(degree)) * 60)
            second = (coordinate.longitude - Double(degree) - Double(minute)/60.0) * 3600
            var second_4 = NSString(format: "%.4f", second)         //show only 4 decimal places
            if (degree >= 0) {
                longitudeLabel_int!.text = "\(degree)"
                longitudeLabel_dec!.text = "\(minute)\\' \(second_4.doubleValue)" E"
            }
            else {
                longitudeLabel_int!.text = "\(-degree)"
                longitudeLabel_dec!.text = "\(-minute)\\' \(-second_4.doubleValue)" W"
            }
            
            degree = Int(coordinate.latitude)
            minute = Int((coordinate.latitude - Double(degree)) * 60)
            second = (coordinate.latitude - Double(degree) - Double(minute)/60.0) * 3600
            second_4 = NSString(format: "%.4f", second)
            if (degree >= 0) {
                latitudeLabel_int!.text = "\(degree)"
                latitudeLabel_dec!.text = "\(minute)\\' \(second_4.doubleValue)" N"
            }
            else {
                latitudeLabel_int!.text = "\(-degree)"
                latitudeLabel_dec!.text = "\(-minute)\\' \(-second_4.doubleValue)" S"
            }
        }
    }

    func locationManager(manager: CLLocationManager!, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
        var shouldIAllow = false
        
        switch status {
        case CLAuthorizationStatus.Restricted:
            locationStatus = "Restricted Access to location"
        case CLAuthorizationStatus.Denied:
            locationStatus = "User denied access to location"
        case CLAuthorizationStatus.NotDetermined:
            locationStatus = "Status not determined"
        default:
            locationStatus = "Allowed to location Access!"
            shouldIAllow = true
            
        }
        NSNotificationCenter.defaultCenter().postNotificationName("LabelHasBeenUpdated", object: nil)
        if (true == shouldIAllow) {
            info!.text = "Localization is allowed"
            locationManager.startUpdatingLocation()
        }
        else {
            info!.text = "Denied access: \(locationStatus)"
        }
    }

    override func didReceiveMemoryWarning() {