gemini stuff?

SousChefAI/Config/AppConfig.swift

@@ -7,6 +7,11 @@
 
 import Foundation
 
+/// Scanning mode for ingredient detection
+enum ScanningMode: String, CaseIterable {
+    case geminiVision  // Uses Gemini API for image analysis (recommended)
+    case arKit         // Uses ARKit for spatial scanning (future implementation)
+}
 
 enum AppConfig: Sendable {
     // MARK: - Google Gemini API
@@ -22,13 +27,24 @@ enum AppConfig: Sendable {
     /// 2. Add it to the Xcode project root
     /// 3. Ensure it's added to the target
     
-    // MARK: - AR Configuration
-    /// Enable AR-based scanning features
-    static let enableARScanning = true
+    // MARK: - Scanning Configuration
+    
+    /// Current scanning mode - change this to switch between vision implementations
+    /// Options: .geminiVision (uses Gemini API), .arKit (uses ARKit - future)
+    static let scanningMode: ScanningMode = .geminiVision
+    
+    /// Enable AR-based scanning features (legacy flag, use scanningMode instead)
+    static let enableARScanning = false
     
     // MARK: - Feature Flags
     static let enableRealTimeDetection = true
     static let enableCookingMode = true
     static let maxIngredientsPerScan = 50
     static let minConfidenceThreshold = 0.5
+    
+    // MARK: - Scanning Settings
+    /// How often to send frames to Gemini (in seconds)
+    static let geminiFrameInterval: Double = 1.0
+    /// Maximum scan duration before auto-stop (in seconds)
+    static let maxScanDuration: Double = 60.0
 }

SousChefAI/Models/Ingredient.swift

@@ -7,24 +7,41 @@
 
 import Foundation
 
+/// Represents an alternative guess for what an ingredient might be
+struct IngredientGuess: Identifiable, Codable, Equatable {
+    var id: String { name }
+    let name: String
+    let confidence: Double
+}
+
 struct Ingredient: Identifiable, Codable, Equatable {
     let id: String
     var name: String
     var estimatedQuantity: String
     var confidence: Double
     
+    /// Top 3 guesses for what this ingredient might be (from AI detection)
+    var guesses: [IngredientGuess]
+    
     init(id: String = UUID().uuidString,
          name: String,
          estimatedQuantity: String,
-         confidence: Double = 1.0) {
+         confidence: Double = 1.0,
+         guesses: [IngredientGuess] = []) {
         self.id = id
         self.name = name
         self.estimatedQuantity = estimatedQuantity
         self.confidence = confidence
+        self.guesses = guesses
     }
     
     /// Indicates if the detection confidence is low and requires user verification
     var needsVerification: Bool {
         confidence < 0.7
     }
+    
+    /// Returns the best guess name, or the current name if no guesses available
+    var bestGuessName: String {
+        guesses.first?.name ?? name
+    }
 }

SousChefAI/Services/GeminiVisionService.swift

@@ -0,0 +1,503 @@
+//
+//  GeminiVisionService.swift
+//  SousChefAI
+//
+//  Vision service using Google Gemini 3.0 Flash for ingredient detection
+//  Sends least blurry frame per second to Gemini API for analysis
+//
+
+import Foundation
+import CoreVideo
+import CoreImage
+import Accelerate
+import UIKit
+
+/// Gemini-based implementation for vision ingredient detection
+final class GeminiVisionService: VisionService, @unchecked Sendable {
+    
+    private let apiKey: String
+    private let modelName = "gemini-2.0-flash-exp" // Will update to 3.0 when available
+    
+    nonisolated init(apiKey: String = AppConfig.geminiAPIKey) {
+        self.apiKey = apiKey
+    }
+    
+    // MARK: - VisionService Protocol Implementation
+    
+    nonisolated func detectIngredients(from stream: AsyncStream<CVPixelBuffer>) async throws -> [Ingredient] {
+        // This method is used for continuous scanning
+        // Collect frames, pick least blurry per second, send to Gemini
+        var allDetectedIngredients: [Ingredient] = []
+        var currentSecondFrames: [(buffer: CVPixelBuffer, blurScore: Double, timestamp: Date)] = []
+        var lastProcessTime = Date()
+        
+        for await pixelBuffer in stream {
+            let now = Date()
+            let blurScore = calculateBlurScore(pixelBuffer)
+            
+            currentSecondFrames.append((buffer: pixelBuffer, blurScore: blurScore, timestamp: now))
+            
+            // Process every second
+            if now.timeIntervalSince(lastProcessTime) >= 1.0 {
+                // Find least blurry frame (highest Laplacian variance = sharpest)
+                if let bestFrame = currentSecondFrames.max(by: { $0.blurScore < $1.blurScore }) {
+                    do {
+                        let ingredients = try await analyzeFrameWithGemini(
+                            bestFrame.buffer,
+                            existingIngredients: allDetectedIngredients
+                        )
+                        
+                        // Debug output
+                        print("🔍 GeminiVisionService: Detected \(ingredients.count) items in frame")
+                        if !ingredients.isEmpty {
+                            let jsonData = try? JSONEncoder().encode(ingredients)
+                            if let jsonString = jsonData.flatMap({ String(data: $0, encoding: .utf8) }) {
+                                print("📋 JSON Response: \(jsonString)")
+                            }
+                        }
+                        
+                        // Merge ingredients
+                        allDetectedIngredients = mergeIngredients(existing: allDetectedIngredients, new: ingredients)
+                    } catch {
+                        print("⚠️ GeminiVisionService: Frame analysis failed: \(error)")
+                        // Continue scanning on errors
+                    }
+                }
+                
+                currentSecondFrames.removeAll()
+                lastProcessTime = now
+            }
+            
+            // Stop after reasonable scan time or max ingredients
+            if allDetectedIngredients.count >= AppConfig.maxIngredientsPerScan {
+                break
+            }
+        }
+        
+        return allDetectedIngredients
+    }
+    
+    nonisolated func detectIngredients(from pixelBuffer: CVPixelBuffer) async throws -> [Ingredient] {
+        return try await analyzeFrameWithGemini(pixelBuffer, existingIngredients: [])
+    }
+    
+    nonisolated func analyzeCookingProgress(from stream: AsyncStream<CVPixelBuffer>, for step: String) async throws -> CookingProgress {
+        // For cooking progress, we'll use Gemini to analyze the current state
+        var latestFrame: CVPixelBuffer?
+        
+        for await frame in stream {
+            latestFrame = frame
+            break // Just get one frame for now
+        }
+        
+        guard let frame = latestFrame else {
+            return CookingProgress(isComplete: false, confidence: 0.0, feedback: "No frame available")
+        }
+        
+        return try await analyzeCookingStepWithGemini(frame, step: step)
+    }
+    
+    // MARK: - Blur Detection (Laplacian Variance)
+    
+    /// Calculates blur score using Laplacian variance
+    /// Higher value = sharper image, Lower value = more blurry
+    nonisolated private func calculateBlurScore(_ pixelBuffer: CVPixelBuffer) -> Double {
+        CVPixelBufferLockBaseAddress(pixelBuffer, .readOnly)
+        defer { CVPixelBufferUnlockBaseAddress(pixelBuffer, .readOnly) }
+        
+        let width = CVPixelBufferGetWidth(pixelBuffer)
+        let height = CVPixelBufferGetHeight(pixelBuffer)
+        let bytesPerRow = CVPixelBufferGetBytesPerRow(pixelBuffer)
+        
+        guard let baseAddress = CVPixelBufferGetBaseAddress(pixelBuffer) else {
+            return 0
+        }
+        
+        // Convert to grayscale for Laplacian calculation
+        // For BGRA format, we'll use simple luminance approximation
+        var grayscale = [Float](repeating: 0, count: width * height)
+        let pixels = baseAddress.assumingMemoryBound(to: UInt8.self)
+        
+        for y in 0..<height {
+            for x in 0..<width {
+                let offset = y * bytesPerRow + x * 4
+                let b = Float(pixels[offset])
+                let g = Float(pixels[offset + 1])
+                let r = Float(pixels[offset + 2])
+                // Luminance formula
+                grayscale[y * width + x] = 0.299 * r + 0.587 * g + 0.114 * b
+            }
+        }
+        
+        // Apply Laplacian kernel: [0, 1, 0], [1, -4, 1], [0, 1, 0]
+        var laplacianOutput = [Float](repeating: 0, count: width * height)
+        
+        for y in 1..<(height - 1) {
+            for x in 1..<(width - 1) {
+                let idx = y * width + x
+                let laplacian = -4 * grayscale[idx]
+                    + grayscale[(y - 1) * width + x]
+                    + grayscale[(y + 1) * width + x]
+                    + grayscale[y * width + (x - 1)]
+                    + grayscale[y * width + (x + 1)]
+                laplacianOutput[idx] = laplacian
+            }
+        }
+        
+        // Calculate variance of Laplacian
+        let count = Float(laplacianOutput.count)
+        let mean = laplacianOutput.reduce(0, +) / count
+        let variance = laplacianOutput.reduce(0) { $0 + ($1 - mean) * ($1 - mean) } / count
+        
+        return Double(variance)
+    }
+    
+    // MARK: - Gemini API Integration
+    
+    nonisolated private func analyzeFrameWithGemini(
+        _ pixelBuffer: CVPixelBuffer,
+        existingIngredients: [Ingredient]
+    ) async throws -> [Ingredient] {
+        guard apiKey != "INSERT_KEY_HERE" else {
+            throw VisionServiceError.apiKeyMissing
+        }
+        
+        // Convert pixel buffer to base64 JPEG
+        let imageData = try convertToJPEG(pixelBuffer)
+        let base64Image = imageData.base64EncodedString()
+        
+        // Build prompt with existing ingredients for deduplication
+        let existingList = existingIngredients.isEmpty
+            ? "None yet"
+            : existingIngredients.map { $0.name }.joined(separator: ", ")
+        
+        let prompt = """
+        Analyze this image and identify all food items and ingredients visible.
+        
+        ALREADY DETECTED ITEMS (avoid duplicates, merge similar items):
+        \(existingList)
+        
+        For each NEW item not already listed above, provide:
+        1. The item name (normalized - e.g., "milk" not "milk 2%", "whole milk", etc.)
+        2. Estimated quantity (numeric with unit, e.g., "2", "500ml", "1 dozen")
+        3. Top 3 guesses for what the item might be, with confidence (0.0-1.0)
+        
+        IMPORTANT:
+        - If you see "milk 2%" and "milk" is already detected, DO NOT include it
+        - Use simple, normalized names (e.g., "apple" not "red delicious apple")
+        - Quantity should be numeric estimates
+        - Only include food items and ingredients, not containers or non-food items
+        
+        RESPOND ONLY WITH VALID JSON in this exact format (no markdown):
+        {
+          "items": [
+            {
+              "name": "normalized item name",
+              "quantity": "2",
+              "guesses": [
+                {"name": "primary guess", "confidence": 0.95},
+                {"name": "second guess", "confidence": 0.7},
+                {"name": "third guess", "confidence": 0.3}
+              ]
+            }
+          ]
+        }
+        
+        If no new food items are visible, return: {"items": []}
+        """
+        
+        let url = URL(string: "https://generativelanguage.googleapis.com/v1beta/models/\(modelName):generateContent?key=\(apiKey)")!
+        
+        var request = URLRequest(url: url)
+        request.httpMethod = "POST"
+        request.setValue("application/json", forHTTPHeaderField: "Content-Type")
+        request.timeoutInterval = 30
+        
+        let requestBody: [String: Any] = [
+            "contents": [
+                [
+                    "parts": [
+                        ["text": prompt],
+                        [
+                            "inline_data": [
+                                "mime_type": "image/jpeg",
+                                "data": base64Image
+                            ]
+                        ]
+                    ]
+                ]
+            ],
+            "generationConfig": [
+                "temperature": 0.2,
+                "topK": 32,
+                "topP": 0.95,
+                "maxOutputTokens": 2048
+            ]
+        ]
+        
+        request.httpBody = try JSONSerialization.data(withJSONObject: requestBody)
+        
+        let (data, response) = try await URLSession.shared.data(for: request)
+        
+        guard let httpResponse = response as? HTTPURLResponse else {
+            throw VisionServiceError.invalidResponse
+        }
+        
+        guard (200...299).contains(httpResponse.statusCode) else {
+            print("❌ Gemini API Error: HTTP \(httpResponse.statusCode)")
+            if let errorText = String(data: data, encoding: .utf8) {
+                print("❌ Error body: \(errorText)")
+            }
+            throw VisionServiceError.networkError(NSError(domain: "GeminiAPI", code: httpResponse.statusCode))
+        }
+        
+        return try parseGeminiVisionResponse(data)
+    }
+    
+    nonisolated private func analyzeCookingStepWithGemini(_ pixelBuffer: CVPixelBuffer, step: String) async throws -> CookingProgress {
+        guard apiKey != "INSERT_KEY_HERE" else {
+            throw VisionServiceError.apiKeyMissing
+        }
+        
+        let imageData = try convertToJPEG(pixelBuffer)
+        let base64Image = imageData.base64EncodedString()
+        
+        let prompt = """
+        Analyze this cooking image for the following step:
+        "\(step)"
+        
+        Determine:
+        1. Is this step complete? (true/false)
+        2. Confidence level (0.0-1.0)
+        3. Brief feedback on the current state
+        
+        RESPOND WITH JSON:
+        {
+          "isComplete": false,
+          "confidence": 0.7,
+          "feedback": "Brief description of current state"
+        }
+        """
+        
+        let url = URL(string: "https://generativelanguage.googleapis.com/v1beta/models/\(modelName):generateContent?key=\(apiKey)")!
+        
+        var request = URLRequest(url: url)
+        request.httpMethod = "POST"
+        request.setValue("application/json", forHTTPHeaderField: "Content-Type")
+        
+        let requestBody: [String: Any] = [
+            "contents": [
+                [
+                    "parts": [
+                        ["text": prompt],
+                        [
+                            "inline_data": [
+                                "mime_type": "image/jpeg",
+                                "data": base64Image
+                            ]
+                        ]
+                    ]
+                ]
+            ]
+        ]
+        
+        request.httpBody = try JSONSerialization.data(withJSONObject: requestBody)
+        
+        let (data, _) = try await URLSession.shared.data(for: request)
+        
+        return try parseCookingProgressResponse(data)
+    }
+    
+    // MARK: - Image Conversion
+    
+    nonisolated private func convertToJPEG(_ pixelBuffer: CVPixelBuffer) throws -> Data {
+        let ciImage = CIImage(cvPixelBuffer: pixelBuffer)
+        let context = CIContext()
+        
+        guard let cgImage = context.createCGImage(ciImage, from: ciImage.extent) else {
+            throw VisionServiceError.invalidResponse
+        }
+        
+        let uiImage = UIImage(cgImage: cgImage)
+        
+        // Compress to reasonable size for API
+        guard let jpegData = uiImage.jpegData(compressionQuality: 0.7) else {
+            throw VisionServiceError.invalidResponse
+        }
+        
+        return jpegData
+    }
+    
+    // MARK: - Response Parsing
+    
+    nonisolated private func parseGeminiVisionResponse(_ data: Data) throws -> [Ingredient] {
+        guard let json = try JSONSerialization.jsonObject(with: data) as? [String: Any],
+              let candidates = json["candidates"] as? [[String: Any]],
+              let firstCandidate = candidates.first,
+              let content = firstCandidate["content"] as? [String: Any],
+              let parts = content["parts"] as? [[String: Any]],
+              let firstPart = parts.first,
+              let text = firstPart["text"] as? String else {
+            throw VisionServiceError.decodingError(NSError(domain: "Parsing", code: 0))
+        }
+        
+        // Clean up response (remove markdown if present)
+        let cleanedText = text
+            .replacingOccurrences(of: "```json", with: "")
+            .replacingOccurrences(of: "```", with: "")
+            .trimmingCharacters(in: .whitespacesAndNewlines)
+        
+        print("📝 Cleaned Gemini response: \(cleanedText)")
+        
+        guard let jsonData = cleanedText.data(using: .utf8) else {
+            throw VisionServiceError.decodingError(NSError(domain: "Parsing", code: 1))
+        }
+        
+        let response = try JSONDecoder().decode(GeminiVisionResponse.self, from: jsonData)
+        
+        return response.items.map { item in
+            // Use the highest confidence guess as the primary name
+            let bestGuess = item.guesses.first
+            let confidence = bestGuess?.confidence ?? 0.5
+            
+            return Ingredient(
+                name: item.name,
+                estimatedQuantity: item.quantity,
+                confidence: confidence,
+                guesses: item.guesses.map { IngredientGuess(name: $0.name, confidence: $0.confidence) }
+            )
+        }
+    }
+    
+    nonisolated private func parseCookingProgressResponse(_ data: Data) throws -> CookingProgress {
+        guard let json = try JSONSerialization.jsonObject(with: data) as? [String: Any],
+              let candidates = json["candidates"] as? [[String: Any]],
+              let firstCandidate = candidates.first,
+              let content = firstCandidate["content"] as? [String: Any],
+              let parts = content["parts"] as? [[String: Any]],
+              let firstPart = parts.first,
+              let text = firstPart["text"] as? String else {
+            throw VisionServiceError.decodingError(NSError(domain: "Parsing", code: 0))
+        }
+        
+        let cleanedText = text
+            .replacingOccurrences(of: "```json", with: "")
+            .replacingOccurrences(of: "```", with: "")
+            .trimmingCharacters(in: .whitespacesAndNewlines)
+        
+        guard let jsonData = cleanedText.data(using: .utf8),
+              let progressJson = try JSONSerialization.jsonObject(with: jsonData) as? [String: Any] else {
+            throw VisionServiceError.decodingError(NSError(domain: "Parsing", code: 1))
+        }
+        
+        return CookingProgress(
+            isComplete: progressJson["isComplete"] as? Bool ?? false,
+            confidence: progressJson["confidence"] as? Double ?? 0.5,
+            feedback: progressJson["feedback"] as? String ?? "Processing..."
+        )
+    }
+    
+    // MARK: - Ingredient Merging
+    
+    /// Merges new ingredients with existing ones, handling similar names and taking max quantity
+    nonisolated private func mergeIngredients(existing: [Ingredient], new: [Ingredient]) -> [Ingredient] {
+        var merged = existing.reduce(into: [String: Ingredient]()) { dict, ingredient in
+            dict[ingredient.name.lowercased()] = ingredient
+        }
+        
+        for newIngredient in new {
+            let normalizedName = newIngredient.name.lowercased()
+            
+            // Check for similar existing items
+            let similarKey = merged.keys.first { existingKey in
+                isSimilarIngredient(existingKey, normalizedName)
+            }
+            
+            if let key = similarKey, let existing = merged[key] {
+                // Merge: take max quantity, higher confidence
+                let mergedQuantity = mergeQuantities(existing.estimatedQuantity, newIngredient.estimatedQuantity)
+                let mergedConfidence = max(existing.confidence, newIngredient.confidence)
+                
+                merged[key] = Ingredient(
+                    id: existing.id,
+                    name: existing.name, // Keep original name
+                    estimatedQuantity: mergedQuantity,
+                    confidence: mergedConfidence,
+                    guesses: existing.guesses // Keep original guesses
+                )
+            } else {
+                // Add as new
+                merged[normalizedName] = newIngredient
+            }
+        }
+        
+        return Array(merged.values).sorted { $0.confidence > $1.confidence }
+    }
+    
+    /// Checks if two ingredient names are similar (e.g., "milk" and "milk 2%")
+    nonisolated private func isSimilarIngredient(_ name1: String, _ name2: String) -> Bool {
+        // Exact match
+        if name1 == name2 { return true }
+        
+        // One contains the other
+        if name1.contains(name2) || name2.contains(name1) { return true }
+        
+        // Common ingredient variations
+        let variations: [[String]] = [
+            ["milk", "whole milk", "2% milk", "skim milk", "milk 2%"],
+            ["egg", "eggs", "large eggs"],
+            ["butter", "unsalted butter", "salted butter"],
+            ["cheese", "cheddar", "cheddar cheese"],
+            ["chicken", "chicken breast", "chicken thigh"],
+            ["onion", "onions", "yellow onion", "white onion"],
+            ["tomato", "tomatoes", "cherry tomatoes"],
+            ["potato", "potatoes", "russet potato"]
+        ]
+        
+        for group in variations {
+            let lowercaseGroup = group.map { $0.lowercased() }
+            if lowercaseGroup.contains(name1) && lowercaseGroup.contains(name2) {
+                return true
+            }
+        }
+        
+        return false
+    }
+    
+    /// Merges two quantity strings, taking the maximum
+    nonisolated private func mergeQuantities(_ q1: String, _ q2: String) -> String {
+        // Extract numeric values
+        let num1 = extractNumber(from: q1) ?? 0
+        let num2 = extractNumber(from: q2) ?? 0
+        
+        // Return the quantity with larger number
+        return num1 >= num2 ? q1 : q2
+    }
+    
+    nonisolated private func extractNumber(from string: String) -> Double? {
+        let pattern = #"[\d.]+"#
+        guard let regex = try? NSRegularExpression(pattern: pattern),
+              let match = regex.firstMatch(in: string, range: NSRange(string.startIndex..., in: string)),
+              let range = Range(match.range, in: string) else {
+            return nil
+        }
+        return Double(string[range])
+    }
+}
+
+// MARK: - Response Models
+
+private struct GeminiVisionResponse: Codable {
+    let items: [GeminiVisionItem]
+}
+
+private struct GeminiVisionItem: Codable {
+    let name: String
+    let quantity: String
+    let guesses: [GeminiGuess]
+}
+
+private struct GeminiGuess: Codable {
+    let name: String
+    let confidence: Double
+}

SousChefAI/ViewModels/ScannerViewModel.swift

@@ -19,13 +19,29 @@ final class ScannerViewModel: ObservableObject {
     @Published var error: Error?
     @Published var scanProgress: String = "Ready to scan"
     
+    /// The most recently detected new ingredient (for banner display)
+    @Published var latestNewIngredient: Ingredient?
+    
     private let visionService: VisionService
     private let cameraManager: CameraManager
     private var scanTask: Task<Void, Never>?
     
-    nonisolated init(visionService: VisionService = ARVisionService(),
-                     cameraManager: CameraManager = CameraManager()) {
+    /// Callback when a new ingredient is detected (not a duplicate)
+    var onNewIngredientDetected: ((Ingredient) -> Void)?
+    
+    nonisolated init(cameraManager: CameraManager = CameraManager()) {
         print("📱 ScannerViewModel.init() - Creating ViewModel at \(Date())")
+        
+        // Select vision service based on configuration
+        let visionService: VisionService = switch AppConfig.scanningMode {
+        case .geminiVision:
+            GeminiVisionService()
+        case .arKit:
+            ARVisionService()
+        }
+        
+        print("📱 ScannerViewModel.init() - Using \(AppConfig.scanningMode.rawValue) scanning mode")
+        
         self.visionService = visionService
         self.cameraManager = cameraManager
     }
@@ -62,19 +78,80 @@ final class ScannerViewModel: ObservableObject {
         guard !isScanning else { return }
         
         isScanning = true
-        detectedIngredients.removeAll()
         scanProgress = "Scanning ingredients..."
+        print("📱 ScannerViewModel.startScanning() - Started with \(AppConfig.scanningMode.rawValue) mode")
         
         scanTask = Task {
+            let startTime = Date()
+            
             do {
                 let stream = cameraManager.frameStream()
-                let ingredients = try await visionService.detectIngredients(from: stream)
                 
+                // For Gemini mode, we use real-time detection with callbacks
+                if AppConfig.scanningMode == .geminiVision {
+                    // Process frames continuously until stopped or timeout
+                    var lastProcessTime = Date()
+                    var currentSecondFrames: [(buffer: CVPixelBuffer, timestamp: Date)] = []
+                    
+                    for await frame in stream {
+                        guard !Task.isCancelled else { break }
+                        
+                        // Check timeout
+                        if Date().timeIntervalSince(startTime) >= AppConfig.maxScanDuration {
+                            print("📱 ScannerViewModel: Max scan duration reached")
+                            break
+                        }
+                        
+                        currentSecondFrames.append((buffer: frame, timestamp: Date()))
+                        
+                        // Process every second
+                        let now = Date()
+                        if now.timeIntervalSince(lastProcessTime) >= AppConfig.geminiFrameInterval {
+                            // Pick the frame from the middle of the batch (reasonable approximation)
+                            if let bestFrame = currentSecondFrames[safe: currentSecondFrames.count / 2]?.buffer {
+                                do {
+                                    let previousCount = detectedIngredients.count
+                                    let ingredients = try await visionService.detectIngredients(from: bestFrame)
+                                    
+                                    // Find new ingredients before merging
+                                    let newIngredients = findNewIngredients(ingredients)
+                                    
+                                    // Merge with existing
+                                    updateDetectedIngredients(ingredients, mergeMode: true)
+                                    
+                                    // Notify about new ingredients
+                                    for newIngredient in newIngredients {
+                                        print("🆕 New ingredient detected: \(newIngredient.name)")
+                                        latestNewIngredient = newIngredient
+                                        onNewIngredientDetected?(newIngredient)
+                                    }
+                                    
+                                    scanProgress = "Found \(detectedIngredients.count) items..."
+                                } catch {
+                                    print("⚠️ Frame analysis error: \(error)")
+                                    // Continue scanning on errors
+                                }
+                            }
+                            
+                            currentSecondFrames.removeAll()
+                            lastProcessTime = now
+                        }
+                        
+                        // Stop if we have enough ingredients
+                        if detectedIngredients.count >= AppConfig.maxIngredientsPerScan {
+                            break
+                        }
+                    }
+                } else {
+                    // AR mode: use batch detection
+                    let ingredients = try await visionService.detectIngredients(from: stream)
                     updateDetectedIngredients(ingredients)
-                scanProgress = "Scan complete! Found \(ingredients.count) ingredients"
+                }
+                
+                scanProgress = "Scan complete! Found \(detectedIngredients.count) ingredients"
             } catch {
                 self.error = error
-                scanProgress = "Scan failed"
+                scanProgress = "Scan failed: \(error.localizedDescription)"
             }
             
             isScanning = false
@@ -123,20 +200,58 @@ final class ScannerViewModel: ObservableObject {
     
     // MARK: - Ingredient Management
     
+    /// Finds ingredients that are truly new (not already in our list)
+    private func findNewIngredients(_ newIngredients: [Ingredient]) -> [Ingredient] {
+        return newIngredients.filter { newIngredient in
+            !detectedIngredients.contains { existing in
+                isSimilarIngredient(existing.name, newIngredient.name)
+            }
+        }
+    }
+    
+    /// Checks if two ingredient names refer to the same item
+    private func isSimilarIngredient(_ name1: String, _ name2: String) -> Bool {
+        let n1 = name1.lowercased()
+        let n2 = name2.lowercased()
+        
+        // Exact match
+        if n1 == n2 { return true }
+        
+        // One contains the other
+        if n1.contains(n2) || n2.contains(n1) { return true }
+        
+        return false
+    }
+    
     private func updateDetectedIngredients(_ newIngredients: [Ingredient], mergeMode: Bool = false) {
         if mergeMode {
-            // Merge with existing ingredients, keeping higher confidence
+            // Merge with existing ingredients, keeping higher confidence and max quantity
             var merged = detectedIngredients.reduce(into: [String: Ingredient]()) { dict, ingredient in
-                dict[ingredient.name] = ingredient
+                dict[ingredient.name.lowercased()] = ingredient
             }
             
             for ingredient in newIngredients {
-                if let existing = merged[ingredient.name] {
-                    if ingredient.confidence > existing.confidence {
-                        merged[ingredient.name] = ingredient
+                let normalizedName = ingredient.name.lowercased()
+                
+                // Check for similar existing items
+                let similarKey = merged.keys.first { existingKey in
+                    isSimilarIngredient(existingKey, normalizedName)
                 }
+                
+                if let key = similarKey, let existing = merged[key] {
+                    // Merge: take max quantity, higher confidence
+                    let mergedQuantity = mergeQuantities(existing.estimatedQuantity, ingredient.estimatedQuantity)
+                    let mergedConfidence = max(existing.confidence, ingredient.confidence)
+                    
+                    merged[key] = Ingredient(
+                        id: existing.id,
+                        name: existing.name,
+                        estimatedQuantity: mergedQuantity,
+                        confidence: mergedConfidence,
+                        guesses: existing.guesses.isEmpty ? ingredient.guesses : existing.guesses
+                    )
                 } else {
-                    merged[ingredient.name] = ingredient
+                    merged[normalizedName] = ingredient
                 }
             }
             
@@ -146,6 +261,23 @@ final class ScannerViewModel: ObservableObject {
         }
     }
     
+    /// Merges two quantity strings, taking the maximum numeric value
+    private func mergeQuantities(_ q1: String, _ q2: String) -> String {
+        let num1 = extractNumber(from: q1) ?? 0
+        let num2 = extractNumber(from: q2) ?? 0
+        return num1 >= num2 ? q1 : q2
+    }
+    
+    private func extractNumber(from string: String) -> Double? {
+        let pattern = #"[\d.]+"#
+        guard let regex = try? NSRegularExpression(pattern: pattern),
+              let match = regex.firstMatch(in: string, range: NSRange(string.startIndex..., in: string)),
+              let range = Range(match.range, in: string) else {
+            return nil
+        }
+        return Double(string[range])
+    }
+    
     func addIngredient(_ ingredient: Ingredient) {
         if !detectedIngredients.contains(where: { $0.id == ingredient.id }) {
             detectedIngredients.append(ingredient)
@@ -181,4 +313,52 @@ final class ScannerViewModel: ObservableObject {
         await cameraManager.cleanup()
         print("📱 ScannerViewModel.cleanup() - ✅ Cleanup complete")
     }
+    
+    // MARK: - Local Persistence
+    
+    /// Saves ingredients locally using UserDefaults
+    /// TODO: Migrate to FirestoreRepository when Firebase is configured
+    /// To migrate: Replace this method with a call to FirestoreRepository.saveIngredients()
+    func saveIngredientsLocally() {
+        do {
+            let data = try JSONEncoder().encode(detectedIngredients)
+            UserDefaults.standard.set(data, forKey: "savedIngredients")
+            print("💾 Saved \(detectedIngredients.count) ingredients locally")
+        } catch {
+            print("❌ Failed to save ingredients: \(error)")
+        }
+    }
+    
+    /// Loads ingredients from local storage
+    /// TODO: Migrate to FirestoreRepository when Firebase is configured
+    /// To migrate: Replace this method with a call to FirestoreRepository.loadIngredients()
+    func loadIngredientsLocally() {
+        guard let data = UserDefaults.standard.data(forKey: "savedIngredients") else {
+            print("📂 No saved ingredients found")
+            return
+        }
+        
+        do {
+            detectedIngredients = try JSONDecoder().decode([Ingredient].self, from: data)
+            print("📂 Loaded \(detectedIngredients.count) ingredients from local storage")
+        } catch {
+            print("❌ Failed to load ingredients: \(error)")
+        }
+    }
+    
+    /// Clears all saved ingredients
+    func clearSavedIngredients() {
+        detectedIngredients.removeAll()
+        UserDefaults.standard.removeObject(forKey: "savedIngredients")
+        print("🗑️ Cleared all saved ingredients")
+    }
+}
+
+// MARK: - Array Safe Subscript Extension
+
+extension Collection {
+    /// Returns the element at the specified index if it exists, otherwise nil.
+    subscript(safe index: Index) -> Element? {
+        indices.contains(index) ? self[index] : nil
+    }
 }

SousChefAI/Views/ScannerView.swift

@@ -8,6 +8,7 @@
 import SwiftUI
 import ARKit
 import RealityKit
+import AVFoundation
 
 struct ScannerView: View {
     @StateObject private var viewModel = ScannerViewModel()
@@ -18,6 +19,11 @@ struct ScannerView: View {
     @State private var showARView = false
     @State private var previewLayer: AVCaptureVideoPreviewLayer?
     
+    // Banner notification state
+    @State private var showBanner = false
+    @State private var bannerIngredient: Ingredient?
+    @State private var bannerTask: Task<Void, Never>?
+    
     init() {
         print("🔵 ScannerView.init() - View initialized at \(Date())")
     }
@@ -49,6 +55,14 @@ struct ScannerView: View {
                 
                 // Overlay UI
                 VStack {
+                    // New ingredient banner (top of screen)
+                    if showBanner, let ingredient = bannerIngredient {
+                        NewIngredientBanner(ingredient: ingredient)
+                            .transition(.move(edge: .top).combined(with: .opacity))
+                            .padding(.horizontal)
+                            .padding(.top, 8)
+                    }
+                    
                     // Top status bar
                     statusBar
                         .padding()
@@ -71,7 +85,7 @@ struct ScannerView: View {
                         .padding()
                 }
             }
-            .navigationTitle(showARView ? "AR Scanner" : "Camera Preview")
+            .navigationTitle(showARView ? "AR Scanner" : "Ingredient Scanner")
             .navigationBarTitleDisplayMode(.inline)
             .toolbar {
                 ToolbarItem(placement: .navigationBarTrailing) {
@@ -84,6 +98,15 @@ struct ScannerView: View {
             }
             .task {
                 print("🔵 ScannerView.task - Task started at \(Date())")
+                
+                // Load any previously saved ingredients
+                viewModel.loadIngredientsLocally()
+                
+                // Setup new ingredient notification handler
+                viewModel.onNewIngredientDetected = { [self] ingredient in
+                    showNewIngredientBanner(ingredient)
+                }
+                
                 if !showARView {
                     print("🔵 ScannerView.task - Calling setupCamera()")
                     await viewModel.setupCamera()
@@ -96,10 +119,17 @@ struct ScannerView: View {
             }
             .onDisappear {
                 print("🔵 ScannerView.onDisappear - Cleaning up at \(Date())")
+                bannerTask?.cancel()
                 Task {
                     await viewModel.cleanup()
                 }
             }
+            .onChange(of: viewModel.isScanning) { wasScanning, isScanning in
+                // When scanning stops, save ingredients and optionally navigate
+                if wasScanning && !isScanning && !viewModel.detectedIngredients.isEmpty {
+                    viewModel.saveIngredientsLocally()
+                }
+            }
             .alert("Camera Error", isPresented: .constant(viewModel.error != nil)) {
                 Button("OK") {
                     viewModel.error = nil
@@ -120,6 +150,28 @@ struct ScannerView: View {
         }
     }
     
+    // MARK: - Banner Management
+    
+    private func showNewIngredientBanner(_ ingredient: Ingredient) {
+        // Cancel any existing banner dismissal
+        bannerTask?.cancel()
+        
+        // Show new banner
+        withAnimation(.spring(response: 0.3)) {
+            bannerIngredient = ingredient
+            showBanner = true
+        }
+        
+        // Auto-dismiss after 1 second
+        bannerTask = Task { @MainActor in
+            try? await Task.sleep(for: .seconds(1))
+            guard !Task.isCancelled else { return }
+            withAnimation(.easeOut(duration: 0.3)) {
+                showBanner = false
+            }
+        }
+    }
+    
     // MARK: - UI Components
     
     private var statusBar: some View {
@@ -353,6 +405,58 @@ struct ManualIngredientEntry: View {
     }
 }
 
+// MARK: - New Ingredient Banner
+
+struct NewIngredientBanner: View {
+    let ingredient: Ingredient
+    
+    var body: some View {
+        HStack(spacing: 12) {
+            Image(systemName: "plus.circle.fill")
+                .foregroundStyle(.white)
+                .font(.title2)
+            
+            VStack(alignment: .leading, spacing: 2) {
+                Text("New Item Detected")
+                    .font(.caption)
+                    .foregroundStyle(.white.opacity(0.8))
+                
+                Text(ingredient.name.capitalized)
+                    .font(.headline)
+                    .foregroundStyle(.white)
+                
+                if !ingredient.estimatedQuantity.isEmpty {
+                    Text("Qty: \(ingredient.estimatedQuantity)")
+                        .font(.caption)
+                        .foregroundStyle(.white.opacity(0.8))
+                }
+            }
+            
+            Spacer()
+            
+            // Confidence indicator
+            Text("\(Int(ingredient.confidence * 100))%")
+                .font(.caption)
+                .fontWeight(.semibold)
+                .foregroundStyle(.white)
+                .padding(.horizontal, 8)
+                .padding(.vertical, 4)
+                .background(.white.opacity(0.2))
+                .clipShape(Capsule())
+        }
+        .padding()
+        .background(
+            LinearGradient(
+                colors: [Color.green, Color.green.opacity(0.8)],
+                startPoint: .leading,
+                endPoint: .trailing
+            )
+        )
+        .clipShape(RoundedRectangle(cornerRadius: 12))
+        .shadow(color: .black.opacity(0.2), radius: 8, y: 4)
+    }
+}
+
 #Preview {
     ScannerView()
 }