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5
app/src/main/java/com/suyash/creditmanager/presentation/emi_details/EMIDetailEvent.kt
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| package com.suyash.creditmanager.presentation.emi_details | ||
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| sealed class EMIDetailEvent { | ||
| data object BackPressed: EMIDetailEvent() | ||
| } |
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app/src/main/java/com/suyash/creditmanager/presentation/emi_details/EMIDetailScreen.kt
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| Original file line number | Diff line number | Diff line change |
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| package com.suyash.creditmanager.presentation.emi_details | ||
|
|
||
| import androidx.compose.foundation.layout.Arrangement | ||
| import androidx.compose.foundation.layout.Column | ||
| import androidx.compose.foundation.layout.Row | ||
| import androidx.compose.foundation.layout.Spacer | ||
| import androidx.compose.foundation.layout.fillMaxWidth | ||
| import androidx.compose.foundation.layout.height | ||
| import androidx.compose.foundation.layout.padding | ||
| import androidx.compose.foundation.lazy.LazyColumn | ||
| import androidx.compose.foundation.lazy.itemsIndexed | ||
| import androidx.compose.material.icons.Icons | ||
| import androidx.compose.material.icons.filled.ArrowBack | ||
| import androidx.compose.material3.Divider | ||
| import androidx.compose.material3.ExperimentalMaterial3Api | ||
| import androidx.compose.material3.Icon | ||
| import androidx.compose.material3.IconButton | ||
| import androidx.compose.material3.MaterialTheme | ||
| import androidx.compose.material3.Scaffold | ||
| import androidx.compose.material3.SnackbarHost | ||
| import androidx.compose.material3.SnackbarHostState | ||
| import androidx.compose.material3.Text | ||
| import androidx.compose.material3.TopAppBar | ||
| import androidx.compose.runtime.Composable | ||
| import androidx.compose.runtime.LaunchedEffect | ||
| import androidx.compose.runtime.remember | ||
| import androidx.compose.ui.Alignment | ||
| import androidx.compose.ui.Modifier | ||
| import androidx.compose.ui.unit.dp | ||
| import androidx.hilt.navigation.compose.hiltViewModel | ||
| import androidx.navigation.NavController | ||
| import com.suyash.creditmanager.presentation.util.CMUtils | ||
| import kotlinx.coroutines.flow.collectLatest | ||
|
|
||
| @OptIn(ExperimentalMaterial3Api::class) | ||
| @Composable | ||
| fun EMIDetailScreen( | ||
| navController: NavController, | ||
| viewModel: EMIDetailViewModel = hiltViewModel() | ||
| ) { | ||
| val snackbarHostState = remember { SnackbarHostState() } | ||
|
|
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| LaunchedEffect(key1 = true) { | ||
| viewModel.eventFlow.collectLatest { event -> | ||
| when(event) { | ||
| is EMIDetailViewModel.UiEvent.ShowSnackbar -> { | ||
| snackbarHostState.showSnackbar( | ||
| message = event.message | ||
| ) | ||
| } | ||
| is EMIDetailViewModel.UiEvent.NavigateUp -> { | ||
| navController.navigateUp() | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| Scaffold( | ||
| snackbarHost = { | ||
| SnackbarHost(hostState = snackbarHostState) | ||
| }, | ||
| topBar = { | ||
| TopAppBar( | ||
| title = { | ||
| Text(text = "EMI Detail") | ||
| }, | ||
| navigationIcon = { | ||
| IconButton(onClick = { | ||
| viewModel.onEvent(EMIDetailEvent.BackPressed) | ||
| }) { | ||
| Icon( | ||
| Icons.Filled.ArrowBack, | ||
| contentDescription = "Go Back" | ||
| ) | ||
| } | ||
| } | ||
| ) | ||
| } | ||
| ) { paddingValues -> | ||
| Column( | ||
| modifier = Modifier | ||
| .padding(paddingValues) | ||
| .fillMaxWidth() | ||
| .padding(16.dp) | ||
| ) { | ||
| Text( | ||
| text = viewModel.emi?.name?:"", | ||
| style = MaterialTheme.typography.titleLarge, | ||
| color = MaterialTheme.colorScheme.primary | ||
| ) | ||
| Spacer(modifier = Modifier.height(8.dp)) | ||
| Row( | ||
| modifier = Modifier.fillMaxWidth(), | ||
| horizontalArrangement = Arrangement.SpaceBetween, | ||
| verticalAlignment = Alignment.CenterVertically | ||
| ) { | ||
| Text( | ||
| text = CMUtils.currencyMask(viewModel.emi?.amount?:0.0F, viewModel.countryCode), | ||
| style = MaterialTheme.typography.bodySmall, | ||
| color = MaterialTheme.colorScheme.primary | ||
| ) | ||
| viewModel.creditCard?.let { | ||
| Text( | ||
| text = "${it.cardName} (${it.last4Digits})", | ||
| style = MaterialTheme.typography.bodySmall, | ||
| ) | ||
| } | ||
| } | ||
| Spacer(modifier = Modifier.height(8.dp)) | ||
| Text( | ||
| text = CMUtils.currencyMask(viewModel.emiAmount, viewModel.countryCode), | ||
| style = MaterialTheme.typography.bodySmall, | ||
| color = MaterialTheme.colorScheme.primary | ||
| ) | ||
| Spacer(modifier = Modifier.height(16.dp)) | ||
| Divider() | ||
| LazyColumn { | ||
| itemsIndexed(viewModel.schedule) {i, schedule -> | ||
| Row( | ||
| modifier = Modifier.fillMaxWidth().padding(top = 16.dp), | ||
| verticalAlignment = Alignment.CenterVertically | ||
| ) { | ||
| Text(text = (i+1).toString()) | ||
| Column( | ||
| modifier = Modifier | ||
| .padding(start = 16.dp) | ||
| .weight(1f) | ||
| ) { | ||
| Text( | ||
| text = CMUtils.currencyMask(schedule.principal, viewModel.countryCode), | ||
| style = MaterialTheme.typography.bodySmall | ||
| ) | ||
| Spacer(modifier = Modifier.height(8.dp)) | ||
| Text( | ||
| text = CMUtils.currencyMask(schedule.interest, viewModel.countryCode), | ||
| style = MaterialTheme.typography.bodySmall | ||
| ) | ||
| } | ||
| Text( | ||
| text = CMUtils.currencyMask(schedule.amount, viewModel.countryCode), | ||
| color = MaterialTheme.colorScheme.primary | ||
| ) | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } |
93 changes: 93 additions & 0 deletions
93
app/src/main/java/com/suyash/creditmanager/presentation/emi_details/EMIDetailViewModel.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| package com.suyash.creditmanager.presentation.emi_details | ||
|
|
||
| import androidx.datastore.core.DataStore | ||
| import androidx.lifecycle.SavedStateHandle | ||
| import androidx.lifecycle.ViewModel | ||
| import androidx.lifecycle.viewModelScope | ||
| import com.suyash.creditmanager.data.settings.AppSettings | ||
| import com.suyash.creditmanager.domain.model.CreditCard | ||
| import com.suyash.creditmanager.domain.model.EMI | ||
| import com.suyash.creditmanager.domain.use_case.CreditCardUseCases | ||
| import com.suyash.creditmanager.domain.use_case.EMIUseCases | ||
| import com.suyash.creditmanager.domain.util.DateFormat | ||
| import dagger.hilt.android.lifecycle.HiltViewModel | ||
| import kotlinx.coroutines.flow.MutableSharedFlow | ||
| import kotlinx.coroutines.flow.asSharedFlow | ||
| import kotlinx.coroutines.launch | ||
| import javax.inject.Inject | ||
| import kotlin.math.pow | ||
|
|
||
| @HiltViewModel | ||
| class EMIDetailViewModel @Inject constructor( | ||
| private val creditCardUseCases: CreditCardUseCases, | ||
| private val emiUseCases: EMIUseCases, | ||
| private val dataStore: DataStore<AppSettings>, | ||
| savedStateHandle: SavedStateHandle | ||
| ): ViewModel() { | ||
|
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| var emi: EMI? = null | ||
| var creditCard: CreditCard? = null | ||
| var countryCode: String = "IN" | ||
| var dateFormat: DateFormat = DateFormat.DDMMYYYY | ||
| var emiAmount: Float = 0.0F | ||
| var schedule: List<EMISchedule> = emptyList() | ||
|
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| private val _eventFlow = MutableSharedFlow<UiEvent>() | ||
| val eventFlow = _eventFlow.asSharedFlow() | ||
|
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| init { | ||
| savedStateHandle.get<Int>("emiId")?.let { | ||
| viewModelScope.launch { | ||
| emiUseCases.getEMI(it)?.also { e -> | ||
| emi = e | ||
| calculateEMISchedule(e.amount, e.rate, e.months) | ||
| } | ||
| emi?.card?.let { | ||
| creditCardUseCases.getCreditCard(it)?.also { cc -> | ||
| creditCard = cc | ||
| } | ||
| } | ||
| dataStore.data.collect { | ||
| countryCode = it.countryCode | ||
| dateFormat = it.dateFormat | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
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| fun onEvent(event: EMIDetailEvent) { | ||
| when (event) { | ||
| is EMIDetailEvent.BackPressed -> { | ||
| viewModelScope.launch { | ||
| _eventFlow.emit(UiEvent.NavigateUp) | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
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| private fun calculateEMISchedule(startingAmount: Float, interestRate: Float, tenure: Int) { | ||
| val schedule: MutableList<EMISchedule> = mutableListOf() | ||
| var principal: Float = startingAmount | ||
| val monthlyRate: Float = interestRate/1200 | ||
| val emi: Float = startingAmount*monthlyRate*(1+monthlyRate).pow(tenure)/((1+monthlyRate).pow(tenure)-1) | ||
| for (i in 1..tenure) { | ||
| val interest = principal*(monthlyRate) | ||
| val principalPaid: Float = emi - interest | ||
| principal -= principalPaid | ||
| schedule.add(EMISchedule(principalPaid, interest, principal)) | ||
| } | ||
| this.emiAmount = emi | ||
| this.schedule = schedule.toList() | ||
| } | ||
|
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| data class EMISchedule( | ||
| val principal: Float, | ||
| val interest: Float, | ||
| val amount: Float | ||
| ) | ||
|
|
||
| sealed class UiEvent { | ||
| data class ShowSnackbar(val message: String): UiEvent() | ||
| data object NavigateUp: UiEvent() | ||
| } | ||
| } |
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