import UIKit
import Firebase
import FirebaseDatabase
import MapKit
import CoreLocation

class RequestVC: UITableViewController, CLLocationManagerDelegate {

    var locationManager = CLLocationManager()
    var sellerUserNames = [String]()
    var requestLocations = [CLLocationCoordinate2D]()

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "backToMain" {
            self.navigationController?.navigationBar.isHidden = true
        }
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.requestWhenInUseAuthorization()
        locationManager.startUpdatingLocation()

        let databaseRef = FIRDatabase.database().reference()
        databaseRef.child("Sell_Request").observe(FIRDataEventType.childAdded, with: { (FIRDataSnapshot) in

            if let data = FIRDataSnapshot.value as? NSDictionary {
                if let name = data[Constants.NAME] as? String {
                    if let lat = data["latitude"] as? Double {
                        if let long = data["longitude"] as? Double {

                            print("(self.sellerUserNames) Location: Latitude: (lat), Longitude: (long)")

                            self.sellerUserNames.append(name)
                            self.requestLocations.append(CLLocationCoordinate2D(latitude: lat, longitude: long))

                            self.tableView.reloadData()

                        }
                    }
                }
            }
        })
    }


    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        }


    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    override func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return sellerUserNames.count
    }


    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
        let location = locationManager.location?.coordinate

        let buyerLocation = CLLocation(latitude: (location?.latitude)!, longitude: (location?.longitude)!)
        let sellerLocation = CLLocation(latitude: requestLocations[indexPath.row].latitude, longitude: requestLocations[indexPath.row].longitude)

        let distance = buyerLocation.distance(from: sellerLocation) / 1000

        let roundedDistance = round(distance * 100) / 100

        let distanceInMiles = roundedDistance * 0.621
        let roundedDistanceInMiles = round(distanceInMiles * 1000) / 1000


        cell.textLabel?.text = sellerUserNames[indexPath.row] + " - (roundedDistanceInMiles) miles away"

        return cell
    }


    /*
    // Override to support conditional editing of the table view.
    override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
        // Return false if you do not want the specified item to be editable.
        return true
    }
    */

    /*
    // Override to support editing the table view.
    override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
        if editingStyle == .delete {
            // Delete the row from the data source
            tableView.deleteRows(at: [indexPath], with: .fade)
        } else if editingStyle == .insert {
            // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
        }
    }
    */

    /*
    // Override to support rearranging the table view.
    override func tableView(_ tableView: UITableView, moveRowAt fromIndexPath: IndexPath, to: IndexPath) {

    }
    */

    /*
    // Override to support conditional rearranging of the table view.
    override func tableView(_ tableView: UITableView, canMoveRowAt indexPath: IndexPath) -> Bool {
        // Return false if you do not want the item to be re-orderable.
        return true
    }
    */

    /*
    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        // Get the new view controller using segue.destinationViewController.
        // Pass the selected object to the new view controller.
    }
    */

}