added a segmented control to select service state

Signed-off-by: Matt Bruce <mbrucedogs@gmail.com>

EmployeeDirectory/ViewControllers/EmployeesViewController.swift

@@ -11,6 +11,7 @@ import Combine
 class EmployeesViewController: UIViewController {
     private let tableView = UITableView()
     private let activityIndicator = UIActivityIndicatorView(style: .large)
+    private let modeSegmentedControl = UISegmentedControl(items: EmployeeServiceMode.allCases.map{ $0.rawValue } )
     private let viewModel = EmployeesViewModel()
     private var cancellables = Set<AnyCancellable>()
 
@@ -18,8 +19,7 @@ class EmployeesViewController: UIViewController {
         super.viewDidLoad()
         setupUI()
         bindViewModel()
-        viewModel.changeMode(to: .empty)
+        viewModel.fetchEmployees()
-        //viewModel.fetchEmployees()
     }
     
     private func setupUI() {
@@ -35,6 +35,11 @@ class EmployeesViewController: UIViewController {
         // Configure Activity Indicator
         activityIndicator.center = view.center
         view.addSubview(activityIndicator)
+
+        // Configure Mode Selector
+        modeSegmentedControl.selectedSegmentIndex = 0
+        modeSegmentedControl.addTarget(self, action: #selector(onServiceModeChange), for: .valueChanged)
+        navigationItem.titleView = modeSegmentedControl
     }
     
     private func bindViewModel() {
@@ -66,6 +71,17 @@ class EmployeesViewController: UIViewController {
             .store(in: &cancellables)
     }
     
+    @objc private func onServiceModeChange(_ sender: UISegmentedControl) {
+        let selectedMode: EmployeeServiceMode
+        switch sender.selectedSegmentIndex {
+        case 0: selectedMode = .production
+        case 1: selectedMode = .malformed
+        case 2: selectedMode = .empty
+        default: return
+        }
+        viewModel.changeMode(to: selectedMode)
+    }
+    
     private func updateFooter() {
         var message: String? {
             guard !viewModel.isLoading else { return nil }