feat: home view model implemented

app/src/main/java/com/approagency/drug/MainActivity.kt

@@ -11,6 +11,7 @@ import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.tooling.preview.Preview
+import com.approagency.drug.presentation.screens.HomeScreen
 import com.approagency.drug.ui.theme.DrugTheme
 
 class MainActivity : ComponentActivity() {
@@ -20,28 +21,9 @@ class MainActivity : ComponentActivity() {
         setContent {
             DrugTheme {
                 Scaffold(modifier = Modifier.fillMaxSize()) { innerPadding ->
-                    Greeting(
-                        name = "Android",
-                        modifier = Modifier.padding(innerPadding)
-                    )
+                    HomeScreen(modifier = Modifier.padding(innerPadding))
                 }
             }
         }
     }
 }
-
-@Composable
-fun Greeting(name: String, modifier: Modifier = Modifier) {
-    Text(
-        text = "Hello $name!",
-        modifier = modifier
-    )
-}
-
-@Preview(showBackground = true)
-@Composable
-fun GreetingPreview() {
-    DrugTheme {
-        Greeting("Android")
-    }
-}

app/src/main/java/com/approagency/drug/di/AppModule.kt

@@ -1,9 +1,13 @@
 package com.approagency.drug.di
 
+
+import android.app.Application
 import com.approagency.drug.data.repository.DrugRepositoryImpl
 import com.approagency.drug.domain.repository.DrugRepository
 import com.approagency.drug.domain.usecase.GetDrugSearchUseCase
+import com.approagency.drug.presentation.viewModel.HomeViewModel
 import com.approagency.drug.utils.Config
+import org.koin.core.module.dsl.viewModel
 import org.koin.dsl.module
 import retrofit2.Retrofit
 import retrofit2.converter.gson.GsonConverterFactory
@@ -29,5 +33,7 @@ val appModule= module {
         GetDrugSearchUseCase(get())
     }
 
-    //
+    //view model
+    viewModel { (app: Application) ->
+        HomeViewModel(app, get())}
 }

app/src/main/java/com/approagency/drug/presentation/screens/HomeScreen.kt

@@ -2,10 +2,14 @@ package com.approagency.drug.presentation.screens
 
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
+import com.approagency.drug.presentation.viewModel.HomeViewModel
+import org.koin.androidx.compose.koinViewModel
 
 
 @Composable
 fun HomeScreen(
     modifier: Modifier,
-    view
-)
+    viewModel: HomeViewModel = koinViewModel()
+){
+
+}

app/src/main/java/com/approagency/drug/presentation/viewModel/HomeViewModel.kt

@@ -0,0 +1,66 @@
+package com.approagency.drug.presentation.viewModel
+
+import android.net.http.HttpException
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import com.approagency.drug.data.dto.DrugListResponse
+import com.approagency.drug.domain.model.DrugSearchParams
+import com.approagency.drug.domain.usecase.GetDrugSearchUseCase
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asSharedFlow
+import kotlinx.coroutines.flow.update
+import kotlinx.coroutines.launch
+
+class HomeViewModel (
+    private val getDrugSearchUseCase: GetDrugSearchUseCase
+): ViewModel() {
+    private val _uiState = MutableStateFlow(DrugSearchState())
+    val uiState : StateFlow<DrugSearchState> = _uiState
+
+
+    // Add SharedFlow for one-time events
+    private val _event = MutableSharedFlow<HomeEvent>()
+    val event = _event.asSharedFlow()
+
+    fun searchDrugs(drugSearchParams: DrugSearchParams) {
+        _uiState.update { it.copy(isLoading = true) }
+        viewModelScope.launch {
+            try {
+                val result = getDrugSearchUseCase.invoke(drugSearchParams)
+                _uiState.update { it.copy(
+                    isLoading = false,
+                    drugsData = result
+                ) }
+            } catch (e: HttpException) {
+                handleError(e.message)
+            }catch (e: Exception) {
+                handleError(e.localizedMessage ?: "Unknown error")
+            }
+        }
+    }
+
+    private suspend fun handleError(message: String?) {
+        _uiState.update { it.copy(isLoading = false) }
+        _event.emit(HomeEvent.ShowError(message ?: "Error occurred"))
+    }
+
+    // Clear error when consumed
+    fun clearError() {
+        _uiState.update { it.copy(error = null) }
+    }
+}
+
+
+sealed class HomeEvent {
+    data class ShowError(val message: String) : HomeEvent()
+    data class NavigateToDetails(val drugId: String) : HomeEvent()
+}
+
+data class DrugSearchState(
+    val isLoading: Boolean = false,
+    val drugsData: Result<DrugListResponse?>? = null,
+    val error:String? = null
+)
+