added save chat function call into chatview

LexAI_iOS/LexAI_iOS/Views/ChatView.swift

@@ -13,7 +13,11 @@ struct ChatView: View {
     @State private var inputText: String = ""
     @State private var showScanDocuments = false
     @State private var isAwaitingReply = false
-    @Binding var selectedLanguage: String
+
+    @Binding var selectedLanguage: String // language in conversation
+    @EnvironmentObject var firebaseManager: FirebaseManager
+    @Environment(/.scenePhase) private var scenePhase // to detect app exit
+
     private let functions = Functions.functions()
 
     var body: some View {
@@ -56,6 +60,37 @@ struct ChatView: View {
             }
             #endif
         }
+        // triger 1: user leaves the view (new chat)
+        .onDisappear {
+            saveChatIfNeeded()
+        }
+
+        // trigger 2: app goes to background or is killed
+        .onChange(of: scenePhase) { , newPhase in 
+            if newPhase == .background || newPhase == .inactive {
+                saveChatIfNeeded()
+            }
+        }
+    }
+
+    // MARK: - Save chat
+    private func saveChatIfNeeded() {
+        guard !messages.isEmpty else { return }
+
+        // Build a readable transcript from the message array
+        let transcript = messages
+            .map { ($0.isFromUser ? "User" : "LexAI") + ": " + $0.text }
+            .joined(separator: "\n")
+
+        let chatPrompt = FirebaseManager.ChatPrompt(
+            prompt: transcript,
+            documents: [],
+            location: "",
+            language: selectedLanguage,
+            user: firebaseManager.user?.uid ?? "anonymous"
+        )
+
+        firebaseManager.saveChat(prompt: chatPrompt)
     }
 
     private var messageList: some View {
@@ -196,4 +231,5 @@ private struct MessageBubbleView: View {
 #Preview {
     @Previewable @State var selectedLanguage = "English"
     return ChatView(selectedLanguage: $selectedLanguage)
+        .environmentObject(FirebaseManager())
 }

LexAI_iOS/LexAI_iOS/Views/ContentView.swift

@@ -9,15 +9,16 @@ import SwiftUI
 
 struct ContentView: View {
 
-    @StateObject var authManager = FirebaseManager()
+    @StateObject var firebaseManager = FirebaseManager()
 
     var body: some View {
         Group {
-            if authManager.isAuthenticated {
+            if firebaseManager.isAuthenticated {
                 HomeView()
+                    .environmentObject(firebaseManager)
             } else {
                 AuthView()
-                    .environmentObject(authManager)
+                    .environmentObject(firebaseManager)
             }
         }
     }

LexAI_iOS/LexAI_iOS/Views/HomeView.swift

@@ -6,6 +6,7 @@ struct HomeView: View {
     @State private var showToolbar = true
     @AppStorage("selectedLanguage") private var selectedLanguage: String = "English" //language storing for conversational use
     @State private var showLanguageDropdown = false
+    @EnvironmentObject var firebaseManager: FirebaseManager
 
     private let languages = ["English", "Spanish", "French", "Arabic", "German"]
 
@@ -14,6 +15,7 @@ struct HomeView: View {
             ZStack {
                 VStack {
                     ChatView(selectedLanguage: $selectedLanguage)
+                        .environmentObject(firebaseManager)
                 }