ViewModel главного экрана + фикс удаления продукта

app/src/main/java/com/example/shawarma/AppModule.kt

@@ -3,6 +3,8 @@ package com.example.shawarma
 import android.app.Application
 import androidx.room.Room
 import com.example.shawarma.data.db.AppDatabase
+import com.example.shawarma.data.repos.OrderProductRepository
+import com.example.shawarma.data.repos.OrderRepository
 import com.example.shawarma.data.repos.ProductRepository
 import com.example.shawarma.data.repos.UserRepository
 import dagger.Module
@@ -33,6 +35,18 @@ object AppModule {
     @Provides
     @Singleton
     fun provideProductRepository(db: AppDatabase) : ProductRepository {
-        return ProductRepository(db.productDao())
+        return ProductRepository(db.productDao(), db.orderProductDao())
+    }
+
+    @Provides
+    @Singleton
+    fun provideOrderRepository(db: AppDatabase) : OrderRepository {
+        return OrderRepository(db.orderDao())
+    }
+
+    @Provides
+    @Singleton
+    fun provideOrderProductRepository(db: AppDatabase) : OrderProductRepository {
+        return OrderProductRepository(db.orderProductDao())
     }
 }

app/src/main/java/com/example/shawarma/data/interfaces/dao/OrderDao.kt

@@ -11,7 +11,7 @@ import kotlinx.coroutines.flow.Flow
 @Dao
 interface OrderDao {
     @Insert
-    suspend fun insert(order: OrderModel)
+    suspend fun insert(order: OrderModel) : Long
     @Update
     suspend fun update(order: OrderModel)
     @Delete
@@ -22,4 +22,6 @@ interface OrderDao {
     fun getById(id: Int): Flow<List<OrderWithProducts>>
     @Query("select * from orders where orders.user_id =:userId")
     fun getByUserId(userId: Int): Flow<List<OrderWithProducts>>
+    @Query("select * from orders where orders.user_id =:userId and orders.order_status = 'Неоплачено'")
+    fun getUnpaidByUser(userId: Int) : Flow<OrderWithProducts>
 }

app/src/main/java/com/example/shawarma/data/interfaces/dao/OrderProductDao.kt

@@ -2,9 +2,16 @@ package com.example.shawarma.data.interfaces.dao
 
 import androidx.room.Dao
 import androidx.room.Insert
+import androidx.room.Query
+import androidx.room.Update
 import com.example.shawarma.data.models.OrderProductModel
 @Dao
 interface OrderProductDao {
     @Insert
     suspend fun insert(order: OrderProductModel)
+    @Update
+    suspend fun update(order: OrderProductModel)
+
+    @Query("delete from order_product WHERE product_id = :productId")
+    suspend fun deleteByProductId(productId: Int);
 }

app/src/main/java/com/example/shawarma/data/interfaces/dao/ProductDao.kt

@@ -15,7 +15,7 @@ interface ProductDao {
     @Update
     suspend fun update(product: ProductModel)
 
-    @Delete
+    @Delete()
     suspend fun delete(product: ProductModel)
 
     @Query("select * from products where products.product_old_price is null")

app/src/main/java/com/example/shawarma/data/models/OrderProductModel.kt

@@ -10,7 +10,7 @@ data class OrderProductModel(
     @ColumnInfo(name = "product_id", index = true)
     var productId: Int,
     @ColumnInfo(name = "quantity")
-    val quantity: Int,
+    var quantity: Int,
     @ColumnInfo(name = "total_price")
-    val totalPrice: Int
+    var totalPrice: Int
 )

app/src/main/java/com/example/shawarma/data/repos/OrderProductRepository.kt

@@ -1,8 +1,5 @@
 package com.example.shawarma.data.repos
 
-import androidx.room.Dao
-import androidx.room.Insert
-import com.example.shawarma.data.interfaces.dao.OrderDao
 import com.example.shawarma.data.interfaces.dao.OrderProductDao
 import com.example.shawarma.data.models.OrderProductModel
 import javax.inject.Inject
@@ -13,4 +10,7 @@ class OrderProductRepository @Inject constructor(
     suspend fun insert(order: OrderProductModel) {
         return orderProductDao.insert(order)
     }
+    suspend fun update(order: OrderProductModel) {
+        return orderProductDao.update(order)
+    }
 }

app/src/main/java/com/example/shawarma/data/repos/OrderRepository.kt

@@ -1,12 +1,6 @@
 package com.example.shawarma.data.repos
 
-import androidx.room.Dao
-import androidx.room.Delete
-import androidx.room.Insert
-import androidx.room.Query
-import androidx.room.Update
 import com.example.shawarma.data.interfaces.dao.OrderDao
-import com.example.shawarma.data.interfaces.dao.ProductDao
 import com.example.shawarma.data.models.OrderModel
 import com.example.shawarma.data.models.OrderWithProducts
 import kotlinx.coroutines.flow.Flow
@@ -15,7 +9,7 @@ import javax.inject.Inject
 class OrderRepository @Inject constructor(
     private val orderDao: OrderDao
 ){
-    suspend fun insert(order: OrderModel) {
+    suspend fun insert(order: OrderModel): Long {
         return orderDao.insert(order)
     }
     suspend fun update(order:OrderModel) {
@@ -33,4 +27,7 @@ class OrderRepository @Inject constructor(
     fun getByUserId(userId: Int): Flow<List<OrderWithProducts>> {
         return orderDao.getByUserId(userId)
     }
+    fun getUnpaidByUser(userId: Int) : Flow<OrderWithProducts?> {
+        return orderDao.getUnpaidByUser(userId)
+    }
 }

app/src/main/java/com/example/shawarma/data/repos/ProductRepository.kt

@@ -1,17 +1,14 @@
 package com.example.shawarma.data.repos
 
-import androidx.room.Delete
+import com.example.shawarma.data.interfaces.dao.OrderProductDao
-import androidx.room.Insert
-import androidx.room.Query
-import androidx.room.Update
 import com.example.shawarma.data.interfaces.dao.ProductDao
-import com.example.shawarma.data.interfaces.dao.UserDao
 import com.example.shawarma.data.models.ProductModel
 import kotlinx.coroutines.flow.Flow
 import javax.inject.Inject
 
 class ProductRepository @Inject constructor(
-    private val productDao: ProductDao
+    private val productDao: ProductDao,
+    private val orderProductDao: OrderProductDao
 ) {
     suspend fun insert(product: ProductModel) {
         return productDao.insert(product)
@@ -20,6 +17,7 @@ class ProductRepository @Inject constructor(
         return productDao.update(product)
     }
     suspend fun delete(product: ProductModel) {
+        orderProductDao.deleteByProductId(product.id!!)
         return productDao.delete(product)
     }
     fun getAll(): Flow<List<ProductModel>> {

app/src/main/java/com/example/shawarma/screens/home/HomeScreen.kt

@@ -20,9 +20,7 @@ import androidx.compose.material.ButtonDefaults
 import androidx.compose.material.Card
 import androidx.compose.material.Text
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.livedata.observeAsState
-import androidx.compose.runtime.mutableStateListOf
-import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
@@ -33,18 +31,18 @@ import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import androidx.compose.ui.zIndex
+import androidx.hilt.navigation.compose.hiltViewModel
 import com.example.shawarma.R
-import com.example.shawarma.data.db.AppDatabase
 import com.example.shawarma.data.models.ProductModel
+import com.example.shawarma.data.sharedpref.PreferencesManager
 import com.example.shawarma.ui.theme.MarckFamily
 import com.example.shawarma.ui.theme.MyLightYellow
 import com.example.shawarma.ui.theme.MyMainBackground
 import com.example.shawarma.ui.theme.MyOrange
 import com.example.shawarma.ui.theme.MyPriceBackground
 import com.example.shawarma.ui.theme.NunitoFamily
+import com.example.shawarma.viewmodels.HomeViewModel
 import com.example.shawarma.widgets.ShawarmaLogo2
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.withContext
 
 @Composable
 fun HomeScreen() {
@@ -58,16 +56,10 @@ fun HomeScreen() {
 
 @Composable
 fun HomeList(){
-    val context = LocalContext.current
+    val homeViewModel: HomeViewModel = hiltViewModel<HomeViewModel>()
-    val products = remember { mutableStateListOf<ProductModel>() }
+
-    LaunchedEffect(Unit) {
+    val products = homeViewModel.products.observeAsState().value
-        withContext(Dispatchers.IO) {
+
-            AppDatabase.getInstance(context).productDao().getAll().collect { data ->
-                products.clear()
-                products.addAll(data)
-            }
-        }
-    }
 
     Box(
         modifier = Modifier
@@ -76,7 +68,6 @@ fun HomeList(){
             .fillMaxSize()
             .background(color = MyMainBackground)
             .zIndex(2f),
-
         contentAlignment = Alignment.TopCenter
     ){
         Text(
@@ -90,6 +81,7 @@ fun HomeList(){
             modifier = Modifier.padding(top = 80.dp)
         )
         {
+            if (products != null) {
                 items(products.size) { index ->
                     if (index % 2 == 0 && index == products.size - 1) {
                         Row(
@@ -100,8 +92,7 @@ fun HomeList(){
                         ) {
                             ProductCard(products[index])
                         }
-                }
+                    } else {
-                else {
                         if (index % 2 != 1) {
                             Row(
                                 horizontalArrangement = Arrangement.SpaceAround,
@@ -120,10 +111,14 @@ fun HomeList(){
                 }
             }
         }
+    }
 }
 
 @Composable
 fun ProductCard(product: ProductModel){
+    val homeViewModel: HomeViewModel = hiltViewModel<HomeViewModel>()
+    val preferencesManager = PreferencesManager(LocalContext.current)
+
     Card(
         shape = RoundedCornerShape(20.dp),
         backgroundColor = Color.White,
@@ -155,6 +150,7 @@ fun ProductCard(product: ProductModel){
                         .size(160.dp, 36.dp)
                 ) {
                     Row(
+                        horizontalArrangement = Arrangement.SpaceBetween
                     ){
                         Text(
                             text = product.price.toString() + " руб.",
@@ -164,7 +160,9 @@ fun ProductCard(product: ProductModel){
                             modifier = Modifier.padding(start = 12.dp, top = 6.dp)
                         )
                         Button(
-                            onClick = { /*TODO*/ },
+                            onClick = {
+                                product.id?.let { homeViewModel.addProductToCart(it, preferencesManager.getData("user_id", "null")) }
+                            },
                             colors = ButtonDefaults.buttonColors(
                                 backgroundColor = MyLightYellow,
                                 contentColor = Color.Black

app/src/main/java/com/example/shawarma/viewmodels/HomeViewModel.kt

@@ -0,0 +1,65 @@
+package com.example.shawarma.viewmodels
+
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import com.example.shawarma.data.models.OrderModel
+import com.example.shawarma.data.models.OrderProductModel
+import com.example.shawarma.data.models.OrderStatus
+import com.example.shawarma.data.models.ProductModel
+import com.example.shawarma.data.repos.OrderProductRepository
+import com.example.shawarma.data.repos.OrderRepository
+import com.example.shawarma.data.repos.ProductRepository
+import dagger.hilt.android.lifecycle.HiltViewModel
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.launch
+import java.util.Date
+import javax.inject.Inject
+
+@HiltViewModel
+class HomeViewModel @Inject constructor(
+    private val productRepository: ProductRepository,
+    private val orderRepository: OrderRepository,
+    private val orderProductRepository: OrderProductRepository
+) : ViewModel() {
+    private val _products =  MutableLiveData<List<ProductModel>>()
+    val products: LiveData<List<ProductModel>>
+        get() = _products
+
+    init {
+        viewModelScope.launch {
+            productRepository.getAll().collect {
+                _products.postValue(it)
+            }
+        }
+    }
+
+    fun addProductToCart(productId: Int, userId: String) {
+        if (userId == "null") return
+
+        viewModelScope.launch {
+            val product = productRepository.getById(productId).first()
+            val order = orderRepository.getUnpaidByUser(userId.toInt()).first()
+            if (order == null) {
+                val newOrderId = orderRepository.insert(OrderModel(null, OrderStatus.Неоплачено.name, userId.toInt(), Date()))
+                orderProductRepository.insert(OrderProductModel(newOrderId.toInt(), productId, 1, product.price))
+            }
+            else {
+                var isAlreadyAdded = false
+                for (prod in order.orderWithProducts) {
+                    if (prod.product.id == productId) {
+                        val model = prod.orderProductModel
+                        model.quantity += 1
+                        model.totalPrice += prod.product.price
+                        orderProductRepository.update(model)
+                        isAlreadyAdded = true
+                    }
+                }
+                if (!isAlreadyAdded) {
+                    orderProductRepository.insert(OrderProductModel(order.order.id!!, productId, 1, product.price))
+                }
+            }
+        }
+    }
+}