[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>
2024-03-20 21:35:46 +00:00
parent c9f4b9a677
commit eac34c61c1
11 changed files with 517 additions and 94 deletions
@@ -0,0 +1,90 @@
+//
+//  FeedListViewModel.swift
+//  ReviewsFeed
+//
+//  Created by Javier Cicchelli on 18/03/2024.
+//  Copyright © 2024 Röck+Cöde. All rights reserved.
+//
+
+import Foundation
+import ReviewsFilterKit
+import ReviewsiTunesKit
+
+extension FeedListViewController {
+    final class ViewModel: ObservableObject {
+        
+        // MARK: Type aliases
+        typealias Configuration = FeedListViewController.Configuration
+        
+        // MARK: Constants
+        private let configuration: Configuration
+
+        // MARK: Properties
+        @Published var filter: FilterOption = .all
+        @Published var isFilterEnabled: Bool = false
+        @Published var isFiltering: Bool = false
+        @Published var isLoading: Bool = false
+
+        var items: [Review] = []
+        
+        private var reviewsAll: [Review] = []
+        private var reviewsFiltered: FilteredReviews = [:]
+        
+        lazy private var iTunesService: iTunesService = {
+            .init(configuration: .init(session: configuration.session))
+        }()
+
+        // MARK: Initialisers
+        init(configuration: Configuration = .init()) {
+            self.configuration = configuration
+        }
+
+        // MARK: Functions
+        func fetch() {
+            Task {
+                isFilterEnabled = false
+                isLoading = items.isEmpty
+
+                do {
+                    let output = try await iTunesService.getReviews(.init(
+                        appID: configuration.appID,
+                        countryCode: configuration.countryCode
+                    ))
+                    
+                    reviewsAll = output.reviews.map(Review.init)
+                    reviewsFiltered = FilterOption.allCases
+                        .reduce(into: FilteredReviews()) { partialResult, option in
+                            partialResult[option] = reviewsAll.filter { $0.rating.stars == option.rawValue }
+                        }
+
+                    items = reviewsAll
+                    isFilterEnabled = !items.isEmpty
+                } catch {
+                    // TODO: handle this error gracefully.
+                    print("ERROR: \(error.localizedDescription)")
+                }
+
+                isLoading = false
+            }
+        }
+        
+        func filter(by option: FilterOption) {
+            guard option != filter else { return }
+            
+            items = option == .all
+                ? reviewsAll
+                : reviewsFiltered[option] ?? []
+            
+            filter = option
+        }
+
+    }
+}
+
+// MARK: - Helpers
+private extension FeedListViewController.ViewModel {
+    
+    // MARK: Type aliases
+    typealias FilteredReviews = [FilterOption: [Review]]
+
+}
@@ -1,69 +0,0 @@
-//
-//  FeedViewModel.swift
-//  ReviewsFeed
-//
-//  Created by Javier Cicchelli on 18/03/2024.
-//  Copyright © 2024 Röck+Cöde. All rights reserved.
-//
-
-import Foundation
-import ReviewsiTunesKit
-
-extension FeedListViewController {
-    final class ViewModel: ObservableObject {
-        
-        // MARK: Type aliases
-        typealias Configuration = FeedListViewController.Configuration
-        
-        // MARK: Constants
-        private let configuration: Configuration
-
-        // MARK: Properties
-        @Published var loading: Bool = false
-        
-        var items: [Review] = []
-        
-        // MARK: Initialisers
-        init(configuration: Configuration = .init()) {
-            self.configuration = configuration
-        }
-        
-        // MARK: Computed
-        lazy private var iTunesService: iTunesService = {
-            .init(configuration: .init(session: configuration.session))
-        }()
-        
-        // MARK: Functions
-        func fetch() {
-            Task {
-                loading = true
-                
-                do {
-                    let output = try await iTunesService.getReviews(.init(
-                        appID: configuration.appID,
-                        countryCode: configuration.countryCode
-                    ))
-                    
-                    items = output.reviews
-                        .map { review -> Review in
-                            .init(
-                                author: review.author,
-                                comment: review.content,
-                                id: review.id,
-                                rating: .init(
-                                    stars: review.rating,
-                                    appVersion: review.version
-                                ),
-                                title: review.title
-                            )
-                        }
-                } catch {
-                    // TODO: handle this error gracefully.
-                }
-
-                loading = false
-            }
-        }
-
-    }
-}