✨ Implement structured generation and Remote Config

firebase-ai-friendly-meals/apple/FriendlyMeals/FriendlyMeals.xcodeproj/project.pbxproj

@@ -9,6 +9,7 @@
 /* Begin PBXBuildFile section */
 		884B2CF22E144BA7007B2E0E /* MarkdownUI in Frameworks */ = {isa = PBXBuildFile; productRef = 884B2CF12E144BA7007B2E0E /* MarkdownUI */; };
 		88662FF02ECF66EF001DA000 /* ConversationKit in Frameworks */ = {isa = PBXBuildFile; productRef = 88662FEF2ECF66EF001DA000 /* ConversationKit */; };
+		88AD6DDF2ED1EAF3004F8BAE /* FirebaseRemoteConfig in Frameworks */ = {isa = PBXBuildFile; productRef = 88AD6DDE2ED1EAF3004F8BAE /* FirebaseRemoteConfig */; };
 		88BE941E2E1413D000C81FF5 /* FirebaseAI in Frameworks */ = {isa = PBXBuildFile; productRef = 88BE941D2E1413D000C81FF5 /* FirebaseAI */; };
 		88C8FB7A2E13DF62001B86C4 /* FirebaseCore in Frameworks */ = {isa = PBXBuildFile; productRef = 88C8FB792E13DF62001B86C4 /* FirebaseCore */; };
 /* End PBXBuildFile section */
@@ -34,6 +35,7 @@
 				88C8FB7A2E13DF62001B86C4 /* FirebaseCore in Frameworks */,
 				88662FF02ECF66EF001DA000 /* ConversationKit in Frameworks */,
 				88BE941E2E1413D000C81FF5 /* FirebaseAI in Frameworks */,
+				88AD6DDF2ED1EAF3004F8BAE /* FirebaseRemoteConfig in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -88,6 +90,7 @@
 				88BE941D2E1413D000C81FF5 /* FirebaseAI */,
 				884B2CF12E144BA7007B2E0E /* MarkdownUI */,
 				88662FEF2ECF66EF001DA000 /* ConversationKit */,
+				88AD6DDE2ED1EAF3004F8BAE /* FirebaseRemoteConfig */,
 			);
 			productName = FriendlyMeals;
 			productReference = 88C8FB652E13D879001B86C4 /* FriendlyMeals.app */;
@@ -397,6 +400,11 @@
 			package = 88662FEE2ECF66EF001DA000 /* XCRemoteSwiftPackageReference "ConversationKit" */;
 			productName = ConversationKit;
 		};
+		88AD6DDE2ED1EAF3004F8BAE /* FirebaseRemoteConfig */ = {
+			isa = XCSwiftPackageProductDependency;
+			package = 88C8FB772E13DEE1001B86C4 /* XCRemoteSwiftPackageReference "firebase-ios-sdk" */;
+			productName = FirebaseRemoteConfig;
+		};
 		88BE941D2E1413D000C81FF5 /* FirebaseAI */ = {
 			isa = XCSwiftPackageProductDependency;
 			package = 88C8FB772E13DEE1001B86C4 /* XCRemoteSwiftPackageReference "firebase-ios-sdk" */;

firebase-ai-friendly-meals/apple/FriendlyMeals/FriendlyMeals/Features/Services/GenerationConfig+Decodable.swift

@@ -0,0 +1,58 @@
+//
+// FriendlyMeals
+//
+// Copyright © 2025 Google LLC.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import Foundation
+import FirebaseAI
+
+extension ResponseModality: @retroactive Decodable {
+  public init(from decoder: Decoder) throws {
+    let container = try decoder.singleValueContainer()
+    let rawValue = try container.decode(String.self)
+    switch rawValue {
+    case "TEXT":
+      self = .text
+    case "IMAGE":
+      self = .image
+    default:
+      throw DecodingError.dataCorruptedError(
+        in: container,
+        debugDescription: "Invalid ResponseModality raw value '\(rawValue)'"
+      )
+    }
+  }
+}
+
+extension GenerationConfig: @retroactive Decodable {
+  private enum CodingKeys: String, CodingKey {
+    case temperature
+    case topP
+    case topK
+    case maxOutputTokens
+    case responseModalities
+  }
+
+  public init(from decoder: Decoder) throws {
+    let container = try decoder.container(keyedBy: CodingKeys.self)
+    let temperature = try container.decodeIfPresent(Float.self, forKey: .temperature)
+    let topP = try container.decodeIfPresent(Float.self, forKey: .topP)
+    let topK = try container.decodeIfPresent(Int.self, forKey: .topK)
+    let maxOutputTokens = try container.decodeIfPresent(Int.self, forKey: .maxOutputTokens)
+    let responseModalities = try container.decodeIfPresent([ResponseModality].self, forKey: .responseModalities) ?? []
+
+    self.init(temperature: temperature, topP: topP, topK: topK, maxOutputTokens: maxOutputTokens, responseModalities: responseModalities)
+  }
+}

firebase-ai-friendly-meals/apple/FriendlyMeals/FriendlyMeals/Features/Services/RemoteConfigService.swift

@@ -0,0 +1,90 @@
+//
+// FriendlyMeals
+//
+// Copyright © 2025 Google LLC.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import Foundation
+import FirebaseRemoteConfig
+import FirebaseAI
+
+fileprivate enum RemoteConfigKey: String {
+  case maxImagesPerDay = "max_images_per_day"
+  case modelName = "model_name"
+  case generationConfig = "generation_config"
+}
+
+@Observable
+class RemoteConfigService {
+  static let shared = RemoteConfigService()
+
+  var maxImagesPerDay: Int = 5
+  var modelName: String = "gemini-2.0-flash-preview-image-generation"
+  var generationConfig: GenerationConfig?
+
+  private var remoteConfig: RemoteConfig
+
+  private init() {
+    remoteConfig = RemoteConfig.remoteConfig()
+    let settings = RemoteConfigSettings()
+    settings.minimumFetchInterval = 0
+    remoteConfig.configSettings = settings
+    setDefaults()
+    listenForUpdates()
+  }
+
+  private func setDefaults() {
+    remoteConfig.setDefaults(fromPlist: "remote_config_defaults")
+  }
+
+  private func listenForUpdates() {
+    remoteConfig.addOnConfigUpdateListener { [weak self] configUpdate, error in
+      guard let self = self else { return }
+      if let error = error {
+        print("Error listening for config updates: \(error.localizedDescription)")
+        return
+      }
+
+      print("Updated keys: \(String(describing: configUpdate?.updatedKeys))")
+      Task { @MainActor in
+        do {
+          let changed = try await self.remoteConfig.activate()
+          if changed {
+            self.updateParameters()
+          }
+        }
+        catch {
+          print("Error activating config: \(error.localizedDescription)")
+        }
+      }
+    }
+  }
+
+  private func updateParameters() {
+    maxImagesPerDay = remoteConfig[RemoteConfigKey.maxImagesPerDay.rawValue].numberValue.intValue
+    modelName = remoteConfig[RemoteConfigKey.modelName.rawValue].stringValue
+    do {
+      generationConfig = try remoteConfig[RemoteConfigKey.generationConfig.rawValue].decoded(asType: GenerationConfig.self)
+    }
+    catch {
+      print("Error decoding generation config: \(error.localizedDescription)")
+    }
+  }
+
+  func fetchConfig() async throws {
+    try await remoteConfig.fetch()
+    try await remoteConfig.activate()
+    self.updateParameters()
+  }
+}

firebase-ai-friendly-meals/apple/FriendlyMeals/FriendlyMeals/Features/Services/UsageTrackingService.swift

@@ -0,0 +1,58 @@
+//
+// FriendlyMeals
+//
+// Copyright © 2025 Google LLC.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import Foundation
+
+class UsageTrackingService {
+  static let shared = UsageTrackingService()
+
+  private let userDefaults = UserDefaults.standard
+  private let generationCountKey = "generationCount"
+  private let lastGenerationDateKey = "lastGenerationDate"
+
+  private init() {}
+
+  func canGenerate() -> Bool {
+    resetCountIfNeeded()
+    let count = userDefaults.integer(forKey: generationCountKey)
+    let maxImagesPerDay = RemoteConfigService.shared.maxImagesPerDay
+    print("Checking if user can generate images. Count: \(count), Max: \(maxImagesPerDay)")
+    return count < maxImagesPerDay
+  }
+
+  func incrementGenerationCount() {
+    resetCountIfNeeded()
+    let count = userDefaults.integer(forKey: generationCountKey)
+    userDefaults.set(count + 1, forKey: generationCountKey)
+  }
+
+  private func resetCounter() {
+    userDefaults.set(Date(), forKey: lastGenerationDateKey)
+    userDefaults.set(0, forKey: generationCountKey)
+  }
+
+  private func resetCountIfNeeded() {
+    guard let lastGenerationDate = userDefaults.object(forKey: lastGenerationDateKey) as? Date else {
+      resetCounter()
+      return
+    }
+
+    if !Calendar.current.isDateInToday(lastGenerationDate) {
+      resetCounter()
+    }
+  }
+}

firebase-ai-friendly-meals/apple/FriendlyMeals/FriendlyMeals/Features/SuggestRecipe/PaywallView.swift

@@ -0,0 +1,112 @@
+//
+// FriendlyMeals
+//
+// Copyright © 2025 Google LLC.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import SwiftUI
+
+struct PaywallView: View {
+  @Environment(\.dismiss) private var dismiss
+
+  var body: some View {
+    ZStack(alignment: .topTrailing) {
+      // Close Button
+      Button(action: { dismiss() }) {
+        Image(systemName: "xmark.circle.fill")
+          .font(.title)
+          .foregroundColor(.gray.opacity(0.6))
+      }
+      .padding()
+
+      VStack(spacing: 20) {
+        Spacer()
+
+        // Icon
+        Image(systemName: "crown.fill")
+          .font(.system(size: 60))
+          .foregroundColor(.yellow)
+
+        // Title and Subtitle
+        Text("Upgrade to Premium")
+          .font(.largeTitle)
+          .fontWeight(.bold)
+          .multilineTextAlignment(.center)
+
+        Text("Unlock unlimited recipe generations and more!")
+          .font(.headline)
+          .multilineTextAlignment(.center)
+          .foregroundColor(.secondary)
+
+        Spacer()
+
+        // Feature List
+        VStack(alignment: .leading, spacing: 15) {
+          FeatureView(text: "Unlimited recipe suggestions")
+          FeatureView(text: "Generate images for every recipe")
+          FeatureView(text: "Save your favorite recipes")
+          FeatureView(text: "Access exclusive meal plans")
+        }
+        .padding(.horizontal)
+
+        Spacer()
+
+        // Call to Action Button
+        Button(action: {
+          // Mock action
+          print("Upgrade button tapped!")
+          dismiss()
+        }) {
+          Text("Unlock Premium")
+            .font(.headline)
+            .fontWeight(.semibold)
+            .foregroundColor(.white)
+            .frame(maxWidth: .infinity)
+            .padding()
+            .background(Color.blue)
+            .cornerRadius(12)
+        }
+        .padding(.horizontal, 40)
+
+        // Restore Purchases Button
+        Button(action: {
+          // Mock action
+          print("Restore purchases tapped!")
+        }) {
+          Text("Restore Purchases")
+            .font(.footnote)
+            .foregroundColor(.secondary)
+        }
+        .padding(.bottom)
+      }
+      .padding()
+    }
+  }
+}
+
+struct FeatureView: View {
+  let text: String
+
+  var body: some View {
+    HStack(spacing: 12) {
+      Image(systemName: "checkmark.circle.fill")
+        .foregroundColor(.blue)
+      Text(text)
+    }
+  }
+}
+
+#Preview {
+  PaywallView()
+}

firebase-ai-friendly-meals/apple/FriendlyMeals/FriendlyMeals/Features/SuggestRecipe/Recipe.swift

@@ -0,0 +1,31 @@
+//
+// FriendlyMeals
+//
+// Copyright © 2025 Google LLC.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import Foundation
+
+struct Recipe: Decodable {
+  struct Ingredient: Decodable {
+    var name: String
+    var amount: String
+  }
+
+  var title: String
+  var description: String
+  var cookingTime: Int
+  var ingredients: [Ingredient]
+  var instructions: [String]
+}