kilometro0/app/app/ContactsViewController.swift

//
//  ContactsViewController.swift
//  app
//
//  Created by Luis Quiñones  on 11/7/19.
//  Copyright © 2019 Luis Quiñones . All rights reserved.
//

import UIKit
import ContactsUI

class ContactsViewController: UIViewController, CNContactPickerDelegate, UITableViewDataSource, UITableViewDelegate {

    let transition = SlideInTransition()
    var topView: UIView?
    let defaults = UserDefaults.standard
    var emergency_contacts: [String:String]?
    var keys: Array<String>?
    
    @IBOutlet weak var tableView: UITableView!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        emergency_contacts = defaults.object(forKey: "contacts") as? [String: String] ?? [String: String]()
        keys = Array(emergency_contacts!.keys)
        self.tableView.register(UINib(nibName: "ContactsTableViewCell", bundle: nil), forCellReuseIdentifier: "ContactsTableViewCell")
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        self.navigationItem.hidesBackButton = true
        tableView.reloadData()
    }

    @IBAction func didTapMenu(_ sender: UIBarButtonItem) {
        guard let menuViewController = storyboard?.instantiateViewController(withIdentifier: "MenuViewController") as? MenuViewController else { return }
        
        menuViewController.modalPresentationStyle = .overCurrentContext
        menuViewController.transitioningDelegate = self
        present(menuViewController, animated: true)
    }
    
    // MARK: - Contacts
    
    @IBAction func addContactsTapped(_ sender: Any) {
        
        let picker = CNContactPickerViewController()
        picker.delegate = self
        present(picker,animated: true, completion: nil)

    }
    
    func contactPicker(_ picker: CNContactPickerViewController, didSelect contacts: [CNContact]) {
        
        if !defaults.contains(key: "contacts") {
            emergency_contacts = [:]
            defaults.set(emergency_contacts, forKey: "contacts")
            print("Set empty contact list")
        }
        contacts.forEach { (contact) in
            for phone_number in contact.phoneNumbers {
                let contact_num = phone_number.value.stringValue
//                var contacts_dict = defaults.object(forKey: "contacts") as? [String: String] ?? [String: String]()
                
                if emergency_contacts!.count >= 10 {
                    print("Contact list limited to 10.")
                }
                    
                else if emergency_contacts?[contact_num] == nil {
                    // Add contact
                    emergency_contacts?[contact_num] = contact.givenName
                    keys = Array(emergency_contacts!.keys)
                    defaults.set(emergency_contacts, forKey: "contacts")
                    print("contact added")
                    // Refresh table
                    tableView.reloadData()
                }
                else {
                    print("Phone number already added.")
                }
            }
        }
    }
    
    func contactPickerDidCancel(_ picker: CNContactPickerViewController) {
        self.dismiss(animated: true, completion: nil)
    }
    
    // MARK: - TableView
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return keys!.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "ContactsTableViewCell", for: indexPath) as! ContactsTableViewCell
        let phone = keys?[indexPath.row]
        let name = emergency_contacts?[phone!]
//        print("name: \(name)")
//        print("phone: \(phone)")
        cell.contactName?.text = name
        cell.contactPhone?.text = phone
        return cell
    }
    
    func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
        return true
    }
    
    func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
            if editingStyle == .delete {
                let cell = tableView.cellForRow(at: indexPath) as! ContactsTableViewCell
                
                let phone = cell.contactPhone?.text
                keys?.remove(at: indexPath.row)
//                print(phone)
                emergency_contacts?[phone!] = nil
                defaults.set(emergency_contacts, forKey: "contacts")
                tableView.beginUpdates()
                tableView.deleteRows(at: [indexPath], with: .fade)
                tableView.endUpdates()
//                print(keys)
//                print(emergency_contacts)
        }
    }
    
} // End VC

// MARK: - Extensions

extension ContactsViewController: UIViewControllerTransitioningDelegate {
    func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        transition.isPresenting = true
        return transition
    }
    func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        transition.isPresenting = false
        return transition
    }
}

extension UserDefaults {
    func object<T: Codable>(_ type: T.Type, with key: String, usingDecoder decoder: JSONDecoder = JSONDecoder()) -> T? {
        guard let data = self.value(forKey: key) as? Data else { return nil }
        return try? decoder.decode(type.self, from: data)
    }

    func set<T: Codable>(object: T, forKey key: String, usingEncoder encoder: JSONEncoder = JSONEncoder()) {
        let data = try? encoder.encode(object)
        self.set(data, forKey: key)
    }
   
    func contains(key: String) -> Bool {
        return UserDefaults.standard.object(forKey: key) != nil
    }
}