feat: Major Project Refactoring and New 'Hello World (with template)' Feature

This commit introduces a significant refactoring of the iOS project, reorganizing the codebase into a more modular and maintainable structure. All feature-specific code has been moved into a new `Features` directory, while shared components (Models, Views) are now centralized under a `Shared` directory.

Key changes include:

- **Project Structure Reorganization**:
    - Created `FirebaseAIExample/Features` to house individual feature modules (e.g., `Chat`, `FunctionCalling`, `GenerativeAIText`, `Grounding`, `Imagen`, `Multimodal`).
    - Created `FirebaseAIExample/Shared` for common models, views, and utilities.
    - Updated `FirebaseAIExample.xcodeproj/project.pbxproj` to reflect the new file paths and group structure.

- **New Feature: 'Hello world (with template)'**:
    - Implemented `GenerateContentFromTemplateScreen` and `GenerateContentFromTemplateViewModel` under `Features/GenerativeAIText`.
    - This feature demonstrates server-side template generation using the `apple-qs-greeting` template.
    - Registered the new feature in `ContentView` and added a corresponding `Sample` entry in `Sample.swift` with the title "Hello world (with template)".

- **Bug Fixes and Best Practices**:
    - **Security Fix**: Replaced insecure API key initialization in `GenerateContentFromTemplateViewModel` with the secure `FirebaseAI.firebaseAI(backend:)` factory method.
    - **Compile Error Resolution**: Moved shared UI components (`ProgressOverlay.swift`, `ErrorDetailsView.swift`) into `FirebaseAIExample/Shared/Views` to resolve compile errors and ensure global accessibility.
    - **Centralized BackendOption**: Extracted the `BackendOption` enum into its own file (`FirebaseAIExample/Shared/Models/BackendOption.swift`) for better code organization and reusability.

This refactoring significantly improves the project's scalability, readability, and adherence to modern Swift/SwiftUI architectural patterns.

Author: peterfriese

firebaseai/FirebaseAIExample.xcodeproj/project.pbxproj

@@ -15,7 +15,7 @@
             buildForAnalyzing = "YES">
             <BuildableReference
                BuildableIdentifier = "primary"
-               BlueprintIdentifier = "8848C82E2B0D04BC007B434F"
+               BlueprintIdentifier = "88779D342EC8A9CF0080D023"
                BuildableName = "FirebaseAIExample.app"
                BlueprintName = "FirebaseAIExample"
                ReferencedContainer = "container:FirebaseAIExample.xcodeproj">
@@ -44,7 +44,7 @@
          runnableDebuggingMode = "0">
          <BuildableReference
             BuildableIdentifier = "primary"
-            BlueprintIdentifier = "8848C82E2B0D04BC007B434F"
+            BlueprintIdentifier = "88779D342EC8A9CF0080D023"
             BuildableName = "FirebaseAIExample.app"
             BlueprintName = "FirebaseAIExample"
             ReferencedContainer = "container:FirebaseAIExample.xcodeproj">
@@ -67,7 +67,7 @@
          runnableDebuggingMode = "0">
          <BuildableReference
             BuildableIdentifier = "primary"
-            BlueprintIdentifier = "8848C82E2B0D04BC007B434F"
+            BlueprintIdentifier = "88779D342EC8A9CF0080D023"
             BuildableName = "FirebaseAIExample.app"
             BlueprintName = "FirebaseAIExample"
             ReferencedContainer = "container:FirebaseAIExample.xcodeproj">

firebaseai/FirebaseAIExample.xcodeproj/xcshareddata/xcschemes/FirebaseAIExample (iOS).xcscheme

@@ -1,6 +1,29 @@
 {
   "images" : [
     {
+      "filename" : "Firebase AI Logic.png",
+      "idiom" : "universal",
+      "platform" : "ios",
+      "size" : "1024x1024"
+    },
+    {
+      "appearances" : [
+        {
+          "appearance" : "luminosity",
+          "value" : "dark"
+        }
+      ],
+      "idiom" : "universal",
+      "platform" : "ios",
+      "size" : "1024x1024"
+    },
+    {
+      "appearances" : [
+        {
+          "appearance" : "luminosity",
+          "value" : "tinted"
+        }
+      ],
       "idiom" : "universal",
       "platform" : "ios",
       "size" : "1024x1024"

firebaseai/FirebaseAIExample/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -13,14 +13,7 @@
 // limitations under the License.
 
 import SwiftUI
-import FirebaseAI
-
-enum BackendOption: String, CaseIterable, Identifiable {
-  case googleAI = "Gemini Developer API"
-  case vertexAI = "Vertex AI Gemini API"
-
-  var id: String { rawValue }
-}
+import FirebaseAILogic
 
 struct ContentView: View {
   @State private var selectedBackend: BackendOption = .googleAI
@@ -107,6 +100,10 @@ struct ContentView: View {
       ChatScreen(backendType: selectedBackend, sample: sample)
     case "ImagenScreen":
       ImagenScreen(backendType: selectedBackend, sample: sample)
+    case "ImagenFromTemplateScreen":
+      ImagenFromTemplateScreen(backendType: selectedBackend, sample: sample)
+    case "GenerateContentFromTemplateScreen":
+      GenerateContentFromTemplateScreen(backendType: selectedBackend, sample: sample)
     case "MultimodalScreen":
       MultimodalScreen(backendType: selectedBackend, sample: sample)
     case "FunctionCallingScreen":

firebaseai/FirebaseAIExample/Assets.xcassets/AppIcon.appiconset/Firebase AI Logic.png

@@ -12,7 +12,11 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-import FirebaseAI
+#if canImport(FirebaseAILogic)
+  import FirebaseAILogic
+#else
+  import FirebaseAI
+#endif
 import SwiftUI
 import ConversationKit
 

firebaseai/FirebaseAIExample/ContentView.swift

@@ -19,6 +19,8 @@
 #endif
 import Foundation
 import UIKit
+import Combine
+import ConversationKit
 
 @MainActor
 class ChatViewModel: ObservableObject {

…ple/ChatExample/Models/ChatMessage.swift …e/Features/Chat/Models/ChatMessage.swiftfirebaseai/FirebaseAIExample/ChatExample/Models/ChatMessage.swift renamed to firebaseai/FirebaseAIExample/Features/Chat/Models/ChatMessage.swift firebaseai/FirebaseAIExample/ChatExample/Models/ChatMessage.swift renamed to firebaseai/FirebaseAIExample/Features/Chat/Models/ChatMessage.swift

@@ -16,6 +16,7 @@ import MarkdownUI
 import SwiftUI
 #if canImport(FirebaseAILogic)
   import FirebaseAILogic
+import ConversationKit
 #else
   import FirebaseAI
 #endif