presentation

app/src/main/java/com/sumin/shoppinglist/data/ShopListRepositoryImpl.kt

@@ -1,23 +1,35 @@
 package com.sumin.shoppinglist.data
 
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
 import com.sumin.shoppinglist.domain.ShopItem
 import com.sumin.shoppinglist.domain.ShopListRepository
 
 object ShopListRepositoryImpl : ShopListRepository {
 
+    private val shopListLD = MutableLiveData<List<ShopItem>>()
     private val shopList = mutableListOf<ShopItem>()
 
     private var autoIncrementId = 0
 
+    init {
+        for (i in 0 until 10){
+            val item = ShopItem("Name $i", i, true)
+            shopList.add(item)
+        }
+    }
+
     override fun addShopItem(shopItem: ShopItem) {
         if (shopItem.id == ShopItem.UNDEFINED_ID){
             shopItem.id = autoIncrementId++
         }
         shopList.add(shopItem)
+        updateList()
     }
 
     override fun deleteShopItem(shopItem: ShopItem) {
         shopList.remove(shopItem)
+        updateList()
     }
 
     override fun editShopItem(shopItem: ShopItem) {
@@ -30,7 +42,11 @@ object ShopListRepositoryImpl : ShopListRepository {
         return shopList.find { it.id == id } ?: throw RuntimeException("Error")
     }
 
-    override fun getShopList(): List<ShopItem> {
-        return shopList.toList()
+    override fun getShopList(): LiveData<List<ShopItem>> {
+        return shopListLD
+    }
+
+    private fun updateList(){
+        shopListLD.value = shopList.toList()
     }
 }

app/src/main/java/com/sumin/shoppinglist/domain/GetShopListUseCase.kt

@@ -1,8 +1,10 @@
 package com.sumin.shoppinglist.domain
 
+import androidx.lifecycle.LiveData
+
 class GetShopListUseCase(private val shopListRepository: ShopListRepository) {
 
-    fun getShopList(): List<ShopItem>{
+    fun getShopList():LiveData<List<ShopItem>> {
         return shopListRepository.getShopList()
     }
 }

app/src/main/java/com/sumin/shoppinglist/domain/ShopListRepository.kt

@@ -1,5 +1,7 @@
 package com.sumin.shoppinglist.domain
 
+import androidx.lifecycle.LiveData
+
 interface ShopListRepository {
 
     fun addShopItem(shopItem: ShopItem)
@@ -10,5 +12,5 @@ interface ShopListRepository {
 
     fun getShopItemById(id: Int): ShopItem
 
-    fun getShopList(): List<ShopItem>
+    fun getShopList(): LiveData<List<ShopItem>>
 }

app/src/main/java/com/sumin/shoppinglist/presentation/MainActivity.kt

@@ -2,11 +2,26 @@ package com.sumin.shoppinglist.presentation
 
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
+import androidx.lifecycle.ViewModelProvider
 import com.sumin.shoppinglist.R
 
 class MainActivity : AppCompatActivity() {
+
+    private lateinit var viewModel: MainViewModel
+
+    private var count = 0
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+        viewModel = ViewModelProvider(this)[MainViewModel::class.java]
+        viewModel.shopList.observe(this){
+            if (count == 0){
+                count++
+                val item = it[0]
+                viewModel.deleteShopItem(item)
+            }
+
+        }
     }
 }

app/src/main/java/com/sumin/shoppinglist/presentation/MainViewModel.kt

@@ -0,0 +1,35 @@
+package com.sumin.shoppinglist.presentation
+
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+import com.sumin.shoppinglist.data.ShopListRepositoryImpl
+import com.sumin.shoppinglist.domain.DeleteShopItemUseCase
+import com.sumin.shoppinglist.domain.EditShopItemUseCase
+import com.sumin.shoppinglist.domain.GetShopListUseCase
+import com.sumin.shoppinglist.domain.ShopItem
+import com.sumin.shoppinglist.domain.ShopListRepository
+
+class MainViewModel : ViewModel() {
+
+    private val repository = ShopListRepositoryImpl
+
+    private val getShopListUseCase = GetShopListUseCase(repository)
+    private val deleteShopItemUseCase = DeleteShopItemUseCase(repository)
+    private val editShopItemUseCase = EditShopItemUseCase(repository)
+
+    val shopList = getShopListUseCase.getShopList()
+
+    fun changeEnabledState(shopItem: ShopItem) {
+        val newItem = shopItem.copy(enabled = !shopItem.enabled)
+        editShopItemUseCase.editShopItem(newItem)
+
+
+    }
+
+    fun deleteShopItem(shopItem: ShopItem) {
+        deleteShopItemUseCase.deleteShopItem(shopItem)
+
+    }
+
+
+}