#41: FavoritesManager(UserDefaults)

EatHub/EatHub/Application/AppDependencies.swift

@@ -39,6 +39,6 @@ struct AppDependencies {
     }
 
     func makeFavoriteViewModel() -> FavoriteViewModel {
-        FavoriteViewModel()
+        FavoriteViewModel(favoritesManager: FavoritesManager(), mealsService: mealsService)
     }
 }

EatHub/EatHub/Design/Extensions/UserDefaults+KeyValueStore.swift

@@ -0,0 +1,13 @@
+//
+//  UserDefaults+KeyValueStore.swift
+//  EatHub
+//
+//  Created by Stepan Chuiko on 30.03.2025.
+//
+import Foundation
+
+extension UserDefaults: KeyValueStore {
+    func array<T>(forKey defaultName: String) -> [T] {
+        (self.array(forKey: defaultName) as? [T]) ?? []
+    }
+}

EatHub/EatHub/Mappers/MealMapper/MealMapper.swift

@@ -38,3 +38,9 @@ extension MealItemResponseModel {
         )
     }
 }
+
+extension Meal {
+    func mapToRecipe() -> RecipeViewModel {
+        RecipeViewModel(id: id, name: name, imageName: thumbnail ?? "MealTemplate")
+    }
+}

EatHub/EatHub/Modules/Favorite/FavoriteView.swift

@@ -13,6 +13,9 @@ struct FavoriteView: View {
             }
             .background(Color(.systemGroupedBackground))
             .navigationBarHidden(true)
+            .onAppear {
+                viewModel.refreshFavorites()
+            }
         }
     }
 }
@@ -27,25 +30,20 @@ private extension FavoriteView {
 
     var favoritesList: some View {
         LazyVStack(spacing: 8) {
-            ForEach(viewModel.recipes) { recipe in
-                //              TODO: Добавить переход
-                //              NavigationLink(destination: RecipeDetailView(recipe: recipe)) {
+            ForEach(viewModel.likedRecipes) { recipe in
+                // TODO: Добавить переход
+                // NavigationLink(destination: RecipeDetailView(recipe: recipe)) {
                 RecipeRow(
                     recipe: recipe,
                     onToggleFavorite: {
                         viewModel.toggleFavorite(for: recipe)
                     }
                 )
-                //              }
+                // }
                 .buttonStyle(PlainButtonStyle())
             }
         }
         .padding(.horizontal)
         .padding(.top, 8)
     }
 }
-
-#Preview {
-    let viewModel = FavoriteViewModel()
-    FavoriteView(viewModel: viewModel)
-}

EatHub/EatHub/Modules/Favorite/FavoriteViewModel.swift

@@ -1,32 +1,59 @@
 import Foundation
+import Combine
+
+final class FavoriteViewModel: ObservableObject {
+    @Published var likedRecipes: [RecipeViewModel] = []
+    var recipesIdentifiers: [String] = []
 
-class FavoriteViewModel: ObservableObject {
-    @Published var recipes: [Recipe] = []
     let title = "Favourites"
 
-    init() {
-        loadMockData()
+    private let favoritesManager: FavoritesManagerInterface
+    private let mealsService: MealsServiceInterface
+    private var cancellables = Set<AnyCancellable>()
+
+    init(favoritesManager: FavoritesManagerInterface, mealsService: MealsServiceInterface) {
+        self.favoritesManager = favoritesManager
+        self.mealsService = mealsService
+
+        // убрать
+        favoritesManager.populateInitialFavorites(with: ["52943", "52869", "52883", "52823"])
     }
 
-    func toggleFavorite(for recipe: Recipe) {
-        guard let index = recipes.firstIndex(of: recipe) else { return }
-        recipes[index].isFavorite.toggle()
+    func toggleFavorite(for recipe: RecipeViewModel) {
+        if recipe.isFavorite {
+            favoritesManager.remove(recipeID: recipe.id)
+        } else {
+            favoritesManager.add(recipeID: recipe.id)
+        }
+
+        recipe.isFavorite.toggle()
     }
 
-    private func loadMockData() {
-        recipes = [
-            Recipe(id: 0, name: "Паста Карбонара", imageName: "caesar"),
-            Recipe(id: 1, name: "Пицца Маргарита", imageName: "caesar"),
-            Recipe(id: 2, name: "Салат Цезарь", imageName: "caesar"),
-            Recipe(id: 3, name: "Паста Карбонара", imageName: "caesar"),
-            Recipe(id: 4, name: "Пицца Маргарита", imageName: "caesar"),
-            Recipe(id: 5, name: "Салат Цезарь", imageName: "caesar"),
-            Recipe(id: 6, name: "Паста Карбонара", imageName: "caesar"),
-            Recipe(id: 7, name: "Пицца Маргарита", imageName: "caesar"),
-            Recipe(id: 8, name: "Салат Цезарь", imageName: "caesar"),
-            Recipe(id: 9, name: "Паста Карбонара", imageName: "caesar"),
-            Recipe(id: 10, name: "Пицца Маргарита", imageName: "caesar"),
-            Recipe(id: 11, name: "Салат Цезарь", imageName: "caesar")
-        ]
+    func refreshFavorites() {
+        cancellables.removeAll()
+
+        let currentFavoriteIDs = Set(favoritesManager.allFavorites())
+
+        likedRecipes.removeAll { !currentFavoriteIDs.contains($0.id) }
+
+        let existingIDs = Set(likedRecipes.map { $0.id })
+        let newIDs = currentFavoriteIDs.subtracting(existingIDs)
+
+        loadNewRecipes(ids: Array(newIDs))
+    }
+
+    private func loadNewRecipes(ids: [String]) {
+        cancellables.removeAll()
+
+        for id in ids {
+            mealsService.fetchMeal(id: id)
+                .receive(on: DispatchQueue.main)
+                .sink { _ in } receiveValue: { [weak self] meal in
+                    if let recipe = meal?.mapToRecipe() {
+                        self?.likedRecipes.append(recipe)
+                    }
+                }
+                .store(in: &cancellables)
+        }
     }
 }

EatHub/EatHub/Modules/Favorite/Models/RecipeViewModel.swift

@@ -0,0 +1,14 @@
+import Foundation
+
+class RecipeViewModel: ObservableObject, Identifiable {
+    let id: String
+    @Published var name: String
+    @Published var imageName: String
+    @Published var isFavorite: Bool = true
+
+    init(id: String, name: String, imageName: String) {
+        self.id = id
+        self.name = name
+        self.imageName = imageName
+    }
+}

EatHub/EatHub/Modules/Favorite/RecipeRow.swift

@@ -1,7 +1,7 @@
 import SwiftUI
 
 struct RecipeRow: View {
-    let recipe: Recipe
+    @ObservedObject var recipe: RecipeViewModel
     let onToggleFavorite: () -> Void
 
     private enum Constants {
@@ -14,12 +14,19 @@ struct RecipeRow: View {
 
     var body: some View {
         HStack {
-            Image(recipe.imageName)
-                .resizable()
-                .aspectRatio(contentMode: .fill)
+            if let url = URL(string: recipe.imageName) {
+                CachedAsyncImage(url: url) { image in
+                    image
+                        .resizable()
+                        .aspectRatio(contentMode: .fill)
+                } placeholder: {
+                    Color.gray.opacity(0.3)
+                        .skeletonable(true)
+                }
                 .frame(width: Constants.imageWidth, height: Constants.imageHeight)
                 .clipped()
                 .cornerRadius(Constants.imageCornerRadius)
+            }
 
             Text(recipe.name)
                 .font(.headline)

EatHub/EatHub/Services/FavoritesManager/FavoritesManager.swift

@@ -0,0 +1,49 @@
+//
+//  FavoritesManager.swift
+//  EatHub
+//
+//  Created by Stepan Chuiko on 29.03.2025.
+//
+import Foundation
+
+final class FavoritesManager {
+    private let store: KeyValueStore
+    private let favoritesKey = "favorite_recipes_ids"
+
+    init(store: KeyValueStore = UserDefaults.standard) {
+        self.store = store
+    }
+}
+
+extension FavoritesManager: FavoritesManagerInterface {
+    func add(recipeID: String) {
+        var current = allFavorites()
+        guard !current.contains(recipeID) else { return }
+        current.append(recipeID)
+        save(current)
+    }
+
+    func remove(recipeID: String) {
+        var current = allFavorites()
+        current.removeAll { $0 == recipeID }
+        save(current)
+    }
+
+    func isFavorite(recipeID: String) -> Bool {
+        allFavorites().contains(recipeID)
+    }
+
+    func allFavorites() -> [String] {
+        store.array(forKey: favoritesKey)
+    }
+
+    func populateInitialFavorites(with ids: [String]) {
+        var current = Set(allFavorites())
+        ids.forEach { current.insert($0) }
+        save(Array(current))
+    }
+
+    private func save(_ ids: [String]) {
+        store.set(ids, forKey: favoritesKey)
+    }
+}

EatHub/EatHub/Services/FavoritesManager/FavoritesManagerInterface.swift

@@ -0,0 +1,14 @@
+//
+//  FavoritesManagerInterface.swift
+//  EatHub
+//
+//  Created by Stepan Chuiko on 29.03.2025.
+//
+
+protocol FavoritesManagerInterface {
+    func add(recipeID: String)
+    func remove(recipeID: String)
+    func isFavorite(recipeID: String) -> Bool
+    func allFavorites() -> [String]
+    func populateInitialFavorites(with ids: [String])
+}

EatHub/EatHub/Services/FavoritesManager/KeyValueStore.swift

@@ -0,0 +1,11 @@
+//
+//  KeyValueStore.swift
+//  EatHub
+//
+//  Created by Stepan Chuiko on 30.03.2025.
+//
+
+protocol KeyValueStore {
+    func set(_ value: Any?, forKey defaultName: String)
+    func array<T>(forKey defaultName: String) -> [T]
+}