[Framework] Feed item filtering in the Feed List view (#11)

This PR contains the work done to implement the filtering of the items shown in the `FeedListViewController` view controller by star rating.

Reviewed-on: rock-n-code/app-reviews#11
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

Frameworks/Feed/Bundle/Sources/UI/View Controllers/FeedListViewController.swift

@@ -7,6 +7,8 @@
 //
 
 import Combine
+import Foundation
+import ReviewsFoundationKit
 import ReviewsUIKit
 import SwiftUI
 import UIKit
@@ -19,6 +21,36 @@ public class FeedListViewController: UITableViewController {
     // MARK: Properties
     private var cancellables: Set<AnyCancellable> = []
     
+    // MARK: Outlets
+    private lazy var filterButton = {
+        UIBarButtonItem(
+            title: NSLocalizedString(
+                .Key.Navigation.Button.filter,
+                bundle: .module,
+                comment: .empty
+            ),
+            image: .Icon.filter,
+            primaryAction: nil,
+            menu: .init(
+                title: NSLocalizedString(
+                    .Key.Menu.filter,
+                    bundle: .module,
+                    comment: .empty
+                ),
+                image: UIImage.Icon.star,
+                children: {
+                    FilterOption.allCases.map { option -> UIAction in
+                            .init(title: option.text,
+                                  image: .init(systemName: option.icon)
+                            ) { [weak self] _ in
+                                self?.viewModel.filter(by: option)
+                            }
+                    }
+                }()
+            )
+        )
+    }()
+
     // MARK: Initialisers
     public init(configuration: Configuration = .init()) {
         self.viewModel = .init(configuration: configuration)
@@ -30,6 +62,11 @@ public class FeedListViewController: UITableViewController {
         fatalError("init(coder:) has not been implemented")
     }
     
+    // MARK: Computed
+    var items: [Review] {
+        viewModel.items
+    }
+
     // MARK: UIViewController
     public override func viewDidLoad() {
         super.viewDidLoad()
@@ -60,11 +97,11 @@ public class FeedListViewController: UITableViewController {
         cell.contentConfiguration = {
             if #available(iOS 16.0, *) {
                 UIHostingConfiguration {
-                    FeedItemCell(viewModel.items[indexPath.row])
+                    FeedItemCell(items[indexPath.row])
                 }
             } else {
                 HostingConfiguration {
-                    FeedItemCell(viewModel.items[indexPath.row])
+                    FeedItemCell(items[indexPath.row])
                 }
             }
         }()
@@ -77,7 +114,7 @@ public class FeedListViewController: UITableViewController {
         _ tableView: UITableView,
         didSelectRowAt indexPath: IndexPath
     ) {
-        let details = FeedItemViewController(viewModel.items[indexPath.row])
+        let details = FeedItemViewController(items[indexPath.row])
         
         tableView.deselectRow(
             at: indexPath,
@@ -94,15 +131,26 @@ private extension FeedListViewController {
     
     // MARK: Functions
     func bindViewModel() {
-        viewModel.$loading
-            .sink { loading in
-                print("LOADING: \(loading)")
+        viewModel.$filter
+            .receive(on: RunLoop.main)
+            .sink { [weak self] option in
+                self?.updateFilterMenu(option)
+                self?.tableView.reloadData()
+            }
+            .store(in: &cancellables)
+
+        viewModel.$isFilterEnabled
+            .removeDuplicates()
+            .receive(on: RunLoop.main)
+            .sink { [weak self] enabled in
+                self?.filterButton.isEnabled = enabled
             }
             .store(in: &cancellables)
         
-        viewModel.$loading
+        viewModel.$isLoading
             .dropFirst()
             .filter { $0 == false }
+            .removeDuplicates()
             .receive(on: RunLoop.main)
             .sink { [weak self] _ in
                 self?.tableView.reloadData()
@@ -118,7 +166,24 @@ private extension FeedListViewController {
         navigationController?.navigationBar.prefersLargeTitles = true
         navigationController?.navigationBar.isTranslucent = true
 
-        navigationItem.title = "Latest reviews"
+        navigationItem.rightBarButtonItem = filterButton
+        navigationItem.title = NSLocalizedString(
+            .Key.Navigation.title,
+            bundle: .module,
+            comment: .empty
+        )
+    }
+    
+    func updateFilterMenu(_ option: FilterOption) {
+        filterButton
+            .menu?
+            .children
+            .compactMap { $0 as? UIAction }
+            .forEach { action in
+                action.state = action.title == option.text
+                    ? .on
+                    : .off
+            }
     }
     
 }
@@ -151,11 +216,24 @@ private extension String {
     enum Cell {
         static let feedItem = "FeedItemCell"
     }
+    
+    enum Key {
+        enum Menu {
+            static let filter = "common.filter.menu.title.text"
+        }
+
+        enum Navigation {
+            static let title = "view.feed-list.navigation-bar.title.text"
+            
+            enum Button {
+                static let filter = "view.feed-list.navigation-bar.button.filter-list.text"
+            }
+        }
+    }
 }
 
 // MARK: - Previews
 #if DEBUG
-import ReviewsFoundationKit
 import ReviewsiTunesKit
 
 @available(iOS 17.0, *)