Añadir la opcion de la lista de la compra que por articulo se pueda actualizar el precio

app/build.gradle.kts

@@ -49,6 +49,7 @@ dependencies {
     implementation(libs.androidx.camera.lifecycle)
     implementation(libs.androidx.camera.view)
     implementation(libs.barcode.scanning)
+    implementation(libs.text.recognition)
     implementation(libs.coil.compose)
     implementation(libs.androidx.work.runtime)
     implementation(libs.androidx.work.runtime)

app/src/main/java/com/example/despensapp/data/repository/PantryRepository.kt

@@ -99,6 +99,25 @@ class PantryRepository {
         }
     }
 
+    suspend fun updateProductPrice(productId: Int, newPrice: Double, userName: String): Result<Boolean> {
+        return withContext(Dispatchers.IO) {
+            try {
+                val connection = getConnection()
+                val sql = "UPDATE productos SET precio = ?, modificado_por = ? WHERE id = ?"
+                val statement = connection.prepareStatement(sql)
+                statement.setDouble(1, newPrice)
+                statement.setString(2, userName)
+                statement.setInt(3, productId)
+                
+                val rowsUpdated = statement.executeUpdate()
+                connection.close()
+                Result.success(rowsUpdated > 0)
+            } catch (e: Exception) {
+                Result.failure(e)
+            }
+        }
+    }
+
     suspend fun updateProductFull(
         productId: Int,
         nombre: String,

app/src/main/java/com/example/despensapp/ui/navigation/NavGraph.kt

@@ -1,17 +1,17 @@
 package com.example.despensapp.ui.navigation
 
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.ui.platform.LocalContext
 import androidx.navigation.NavHostController
+import androidx.navigation.NavType
 import androidx.navigation.compose.NavHost
 import androidx.navigation.compose.composable
-import com.example.despensapp.ui.screens.LoginScreen
-import com.example.despensapp.ui.screens.PantryScreen
-import com.example.despensapp.ui.screens.RegisterScreen
-import com.example.despensapp.ui.screens.AddProductScreen
-import com.example.despensapp.ui.screens.ProductDetailScreen
-import com.example.despensapp.ui.screens.SettingsScreen
-import androidx.navigation.NavType
 import androidx.navigation.navArgument
+import com.example.despensapp.data.repository.PantryRepository
+import com.example.despensapp.data.session.UserSession
+import com.example.despensapp.ui.screens.*
+import kotlinx.coroutines.launch
 
 sealed class Screen(val route: String) {
     object Login : Screen("login")
@@ -19,6 +19,9 @@ sealed class Screen(val route: String) {
     object Pantry : Screen("pantry")
     object AddProduct : Screen("add_product")
     object Settings : Screen("settings")
+    object PriceScanner : Screen("price_scanner/{productId}") {
+        fun createRoute(productId: Int) = "price_scanner/$productId"
+    }
     object ProductDetail : Screen("product_detail/{productId}") {
         fun createRoute(productId: Int) = "product_detail/$productId"
     }
@@ -65,6 +68,9 @@ fun NavGraph(navController: NavHostController) {
                 onNavigateToSettings = {
                     navController.navigate(Screen.Settings.route)
                 },
+                onNavigateToPriceScanner = { productId ->
+                    navController.navigate(Screen.PriceScanner.createRoute(productId))
+                },
                 onLogout = {
                     navController.navigate(Screen.Login.route) {
                         popUpTo(Screen.Pantry.route) { inclusive = true }
@@ -82,6 +88,27 @@ fun NavGraph(navController: NavHostController) {
                 navController.popBackStack()
             })
         }
+        composable(
+            route = Screen.PriceScanner.route,
+            arguments = listOf(navArgument("productId") { type = NavType.IntType })
+        ) { backStackEntry ->
+            val productId = backStackEntry.arguments?.getInt("productId") ?: 0
+            val repository = PantryRepository()
+            val scope = rememberCoroutineScope()
+            val context = LocalContext.current
+            
+            PriceScannerScreen(
+                onPriceScanned = { price ->
+                    scope.launch {
+                        val userName = UserSession.getUserName(context)
+                        repository.updateProductPrice(productId, price, userName).onSuccess {
+                            navController.popBackStack()
+                        }
+                    }
+                },
+                onBack = { navController.popBackStack() }
+            )
+        }
         composable(
             route = Screen.ProductDetail.route,
             arguments = listOf(navArgument("productId") { type = NavType.IntType })

app/src/main/java/com/example/despensapp/ui/screens/PantryScreen.kt

@@ -42,6 +42,7 @@ fun PantryScreen(
     onNavigateToAdd: () -> Unit, 
     onNavigateToDetail: (Int) -> Unit,
     onNavigateToSettings: () -> Unit,
+    onNavigateToPriceScanner: (Int) -> Unit,
     onLogout: () -> Unit
 ) {
     val context = LocalContext.current
@@ -323,6 +324,8 @@ fun PantryScreen(
                                 ProductItem(
                                     product = product,
                                     onItemClick = { onNavigateToDetail(product.id) },
+                                    showPriceUpdater = showShoppingList,
+                                    onUpdatePrice = { onNavigateToPriceScanner(product.id) },
                                     onQuantityChange = { newQty ->
                                         scope.launch {
                                             val success = repository.updateProductQuantity(product.id, newQty, userName)
@@ -397,7 +400,13 @@ fun isNearExpiry(dateStr: String?): Boolean {
 }
 
 @Composable
-fun ProductItem(product: Product, onItemClick: () -> Unit, onQuantityChange: (Int) -> Unit) {
+fun ProductItem(
+    product: Product, 
+    onItemClick: () -> Unit, 
+    showPriceUpdater: Boolean = false,
+    onUpdatePrice: () -> Unit = {},
+    onQuantityChange: (Int) -> Unit
+) {
     Card(
         modifier = Modifier
             .fillMaxWidth()
@@ -454,6 +463,12 @@ fun ProductItem(product: Product, onItemClick: () -> Unit, onQuantityChange: (In
 
                 Spacer(modifier = Modifier.width(16.dp))
 
+                Column(modifier = Modifier.weight(1f)) {
+                    Row(
+                        modifier = Modifier.fillMaxWidth(),
+                        horizontalArrangement = Arrangement.SpaceBetween,
+                        verticalAlignment = Alignment.Top
+                    ) {
                         Column(modifier = Modifier.weight(1f)) {
                             Text(
                                 text = product.name,
@@ -466,6 +481,25 @@ fun ProductItem(product: Product, onItemClick: () -> Unit, onQuantityChange: (In
                                 fontSize = 14.sp,
                                 color = Color.Gray
                             )
+                        }
+
+                        // Botones de acción arriba a la derecha en columna (+ arriba, - abajo)
+                        Column(horizontalAlignment = Alignment.CenterHorizontally) {
+                            FilledIconButton(
+                                onClick = { onQuantityChange(product.quantity + 1) },
+                                modifier = Modifier.size(36.dp)
+                            ) {
+                                Icon(Icons.Default.Add, contentDescription = stringResource(R.string.add_product_more), modifier = Modifier.size(18.dp))
+                            }
+                            Spacer(modifier = Modifier.height(8.dp))
+                            FilledTonalIconButton(
+                                onClick = { if (product.quantity > 0) onQuantityChange(product.quantity - 1) },
+                                modifier = Modifier.size(36.dp)
+                            ) {
+                                Icon(Icons.Default.Remove, contentDescription = stringResource(R.string.add_product_less), modifier = Modifier.size(18.dp))
+                            }
+                        }
+                    }
                     
                     // Información de Fechas y Usuario (organizada en columna para evitar solapamientos)
                     Column(modifier = Modifier.padding(top = 4.dp)) {
@@ -533,10 +567,11 @@ fun ProductItem(product: Product, onItemClick: () -> Unit, onQuantityChange: (In
 
                     Row(
                         modifier = Modifier.fillMaxWidth(),
-                        verticalAlignment = Alignment.CenterVertically,
+                        verticalAlignment = Alignment.CenterVertically
-                        horizontalArrangement = Arrangement.SpaceBetween
                     ) {
+                        // Recuadro de Unidades y Precio con peso flexible
                         Surface(
+                            modifier = Modifier.weight(1f, fill = false),
                             shape = MaterialTheme.shapes.medium,
                             color = if (product.isLowStock) MaterialTheme.colorScheme.errorContainer
                             else MaterialTheme.colorScheme.secondaryContainer,
@@ -561,19 +596,18 @@ fun ProductItem(product: Product, onItemClick: () -> Unit, onQuantityChange: (In
                             }
                         }
                         
-                        Row {
+                        // Botón de OCR Precio (Solo en modo Lista Compra)
-                            FilledTonalIconButton(
+                        if (showPriceUpdater) {
-                                onClick = { if (product.quantity > 0) onQuantityChange(product.quantity - 1) },
-                                modifier = Modifier.size(32.dp)
-                            ) {
-                                Icon(Icons.Default.Remove, contentDescription = stringResource(R.string.add_product_less), modifier = Modifier.size(18.dp))
-                            }
                             Spacer(modifier = Modifier.width(8.dp))
-                            FilledIconButton(
+                            IconButton(
-                                onClick = { onQuantityChange(product.quantity + 1) },
+                                onClick = onUpdatePrice,
                                 modifier = Modifier.size(32.dp)
                             ) {
-                                Icon(Icons.Default.Add, contentDescription = stringResource(R.string.add_product_more), modifier = Modifier.size(18.dp))
+                                Icon(
+                                    Icons.Default.QrCodeScanner, 
+                                    contentDescription = stringResource(R.string.pantry_update_price),
+                                    tint = MaterialTheme.colorScheme.primary
+                                )
                             }
                         }
                     }
@@ -587,6 +621,6 @@ fun ProductItem(product: Product, onItemClick: () -> Unit, onQuantityChange: (In
 @Composable
 fun PantryScreenPreview() {
     DespensappTheme {
-        PantryScreen(onNavigateToAdd = {}, onNavigateToDetail = {}, onNavigateToSettings = {}, onLogout = {})
+        PantryScreen(onNavigateToAdd = {}, onNavigateToDetail = {}, onNavigateToSettings = {}, onNavigateToPriceScanner = {}, onLogout = {})
     }
 }

app/src/main/java/com/example/despensapp/ui/screens/PriceScannerScreen.kt

@@ -0,0 +1,168 @@
+package com.example.despensapp.ui.screens
+
+import android.util.Log
+import androidx.camera.core.*
+import androidx.camera.lifecycle.ProcessCameraProvider
+import androidx.camera.view.PreviewView
+import androidx.compose.foundation.background
+import androidx.compose.foundation.border
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.ArrowBack
+import androidx.compose.material.icons.filled.FlashOff
+import androidx.compose.material.icons.filled.FlashOn
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.platform.LocalLifecycleOwner
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.viewinterop.AndroidView
+import androidx.core.content.ContextCompat
+import com.example.despensapp.R
+import com.google.mlkit.vision.common.InputImage
+import com.google.mlkit.vision.text.TextRecognition
+import com.google.mlkit.vision.text.latin.TextRecognizerOptions
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun PriceScannerScreen(onPriceScanned: (Double) -> Unit, onBack: () -> Unit) {
+    val context = LocalContext.current
+    val lifecycleOwner = LocalLifecycleOwner.current
+    val cameraProviderFuture = remember { ProcessCameraProvider.getInstance(context) }
+    
+    var torchEnabled by remember { mutableStateOf(false) }
+    var detectedText by remember { mutableStateOf("") }
+    var detectedPrice by remember { mutableStateOf<Double?>(null) }
+    
+    val recognizer = remember { TextRecognition.getClient(TextRecognizerOptions.DEFAULT_OPTIONS) }
+
+    Scaffold(
+        topBar = {
+            TopAppBar(
+                title = { Text(stringResource(R.string.pantry_scan_price)) },
+                navigationIcon = {
+                    IconButton(onClick = onBack) {
+                        Icon(Icons.AutoMirrored.Filled.ArrowBack, contentDescription = stringResource(R.string.back))
+                    }
+                },
+                actions = {
+                    IconButton(onClick = { torchEnabled = !torchEnabled }) {
+                        Icon(
+                            if (torchEnabled) Icons.Default.FlashOn else Icons.Default.FlashOff,
+                            contentDescription = null,
+                            tint = if (torchEnabled) Color.Yellow else LocalContentColor.current
+                        )
+                    }
+                }
+            )
+        }
+    ) { innerPadding ->
+        Column(
+            modifier = Modifier
+                .padding(innerPadding)
+                .fillMaxSize()
+        ) {
+            Box(modifier = Modifier.weight(1f)) {
+                AndroidView(
+                    factory = { ctx ->
+                        val previewView = PreviewView(ctx)
+                        val executor = ContextCompat.getMainExecutor(ctx)
+                        cameraProviderFuture.addListener({
+                            val cameraProvider = cameraProviderFuture.get()
+                            val preview = Preview.Builder().build().also {
+                                it.setSurfaceProvider(previewView.surfaceProvider)
+                            }
+
+                            val imageAnalysis = ImageAnalysis.Builder()
+                                .setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST)
+                                .build()
+
+                            imageAnalysis.setAnalyzer(executor) { imageProxy ->
+                                @androidx.camera.core.ExperimentalGetImage
+                                val mediaImage = imageProxy.image
+                                if (mediaImage != null) {
+                                    val image = InputImage.fromMediaImage(mediaImage, imageProxy.imageInfo.rotationDegrees)
+                                    recognizer.process(image)
+                                        .addOnSuccessListener { visionText ->
+                                            val fullText = visionText.text
+                                            // Lógica simple para extraer precio: buscar algo como X,XX o X.XX
+                                            val priceRegex = """(\d+[,.]\d{2})""".toRegex()
+                                            val match = priceRegex.find(fullText)
+                                            if (match != null) {
+                                                val priceStr = match.value.replace(",", ".")
+                                                detectedPrice = priceStr.toDoubleOrNull()
+                                                detectedText = match.value
+                                            }
+                                        }
+                                        .addOnCompleteListener { imageProxy.close() }
+                                } else {
+                                    imageProxy.close()
+                                }
+                            }
+
+                            val cameraSelector = CameraSelector.DEFAULT_BACK_CAMERA
+                            try {
+                                cameraProvider.unbindAll()
+                                val camera = cameraProvider.bindToLifecycle(lifecycleOwner, cameraSelector, preview, imageAnalysis)
+                                camera.cameraControl.enableTorch(torchEnabled)
+                            } catch (e: Exception) {
+                                Log.e("PriceScanner", "Binding failed", e)
+                            }
+                        }, executor)
+                        previewView
+                    },
+                    modifier = Modifier.fillMaxSize()
+                )
+
+                // Marco de enfoque
+                Box(
+                    modifier = Modifier
+                        .size(250.dp, 100.dp)
+                        .border(2.dp, Color.White.copy(alpha = 0.5f), RoundedCornerShape(12.dp))
+                        .align(Alignment.Center)
+                )
+
+                Text(
+                    text = stringResource(R.string.pantry_ocr_instruction),
+                    color = Color.White,
+                    modifier = Modifier
+                        .align(Alignment.BottomCenter)
+                        .padding(bottom = 32.dp)
+                        .background(Color.Black.copy(alpha = 0.5f), RoundedCornerShape(8.dp))
+                        .padding(horizontal = 12.dp, vertical = 4.dp)
+                )
+            }
+
+            // Panel inferior con el precio detectado
+            Card(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .padding(16.dp),
+                colors = CardDefaults.cardColors(containerColor = MaterialTheme.colorScheme.surfaceVariant)
+            ) {
+                Column(
+                    modifier = Modifier.padding(16.dp),
+                    horizontalAlignment = Alignment.CenterHorizontally
+                ) {
+                    Text(
+                        text = if (detectedText.isNotEmpty()) "Precio detectado: $detectedText €" else "Buscando precio...",
+                        style = MaterialTheme.typography.headlineSmall
+                    )
+                    Spacer(modifier = Modifier.height(16.dp))
+                    Button(
+                        onClick = { detectedPrice?.let { onPriceScanned(it) } },
+                        enabled = detectedPrice != null,
+                        modifier = Modifier.fillMaxWidth()
+                    ) {
+                        Text(stringResource(R.string.save))
+                    }
+                }
+            }
+        }
+    }
+}

app/src/main/res/values/strings.xml

@@ -61,6 +61,10 @@
     <string name="pantry_expiry_date">Caduca: %1$s</string>
     <string name="pantry_added_date">Añadido: %1$s</string>
     <string name="pantry_last_modified_by">Por: %1$s</string>
+    <string name="pantry_update_price">Actualizar Precio</string>
+    <string name="pantry_scan_price">Escanear Precio</string>
+    <string name="pantry_ocr_instruction">Apunta al precio de la etiqueta</string>
+    <string name="pantry_price_updated">Precio actualizado a %1$.2f €</string>
 
     <!-- Add Product -->
     <string name="add_product_title">Añadir Producto</string>

gradle/libs.versions.toml

@@ -14,6 +14,7 @@ okhttp = "4.12.0"
 mariadbJavaClient = "3.5.10"
 camerax = "1.4.1"
 barcodeScanning = "17.3.0"
+textRecognition = "16.0.1"
 coil = "2.7.0"
 workManager = "2.10.0"
 room = "2.6.1"
@@ -44,6 +45,7 @@ androidx-camera-camera2 = { group = "androidx.camera", name = "camera-camera2",
 androidx-camera-lifecycle = { group = "androidx.camera", name = "camera-lifecycle", version.ref = "camerax" }
 androidx-camera-view = { group = "androidx.camera", name = "camera-view", version.ref = "camerax" }
 barcode-scanning = { group = "com.google.mlkit", name = "barcode-scanning", version.ref = "barcodeScanning" }
+text-recognition = { group = "com.google.mlkit", name = "text-recognition", version.ref = "textRecognition" }
 coil-compose = { group = "io.coil-kt", name = "coil-compose", version.ref = "coil" }
 androidx-work-runtime = { group = "androidx.work", name = "work-runtime-ktx", version.ref = "workManager" }
 androidx-room-runtime = { group = "androidx.room", name = "room-runtime", version.ref = "room" }