Searching transactions for other party to suggest recipients in TransferMoneyDialog

composeApp/src/commonMain/kotlin/net/codinux/banking/ui/dialogs/TransferMoneyDialog.kt

@@ -9,6 +9,7 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.text.input.ImeAction
 import androidx.compose.ui.text.input.KeyboardType
+import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
@@ -19,9 +20,11 @@ import net.codinux.banking.ui.IOorDefault
 import net.codinux.banking.ui.composables.BankIcon
 import net.codinux.banking.ui.config.Colors
 import net.codinux.banking.ui.config.DI
+import net.codinux.banking.ui.forms.AutocompleteTextFieldNew
 import net.codinux.banking.ui.forms.OutlinedTextField
 import net.codinux.banking.ui.forms.Select
 import net.codinux.banking.ui.model.error.ErroneousAction
+import net.codinux.banking.ui.service.RecipientFinder
 
 private val uiState = DI.uiState
 
@@ -44,6 +47,7 @@ fun TransferMoneyDialog(
         return
     }
 
+
     var senderAccount by remember { mutableStateOf(accountsSupportingTransferringMoney.first()) }
 
     var recipientName by remember { mutableStateOf("") }
@@ -58,6 +62,10 @@ fun TransferMoneyDialog(
         derivedStateOf { recipientName.length > 2 && recipientAccountIdentifier.length >= 18 && amount.isNotBlank() }
     }
 
+
+    val recipientFinder = RecipientFinder(DI.bankFinder)
+
+
     var isTransferringMoney by remember { mutableStateOf(false) }
 
     val verticalSpace = 8.dp
@@ -65,6 +73,11 @@ fun TransferMoneyDialog(
     val coroutineScope = rememberCoroutineScope()
 
 
+    coroutineScope.launch {
+        recipientFinder.updateData(bankingService.getAllAccountTransactions()) // only a bit problematic: if in the meantime new transactions are retrieved, then RecipientFinder doesn't contain the newly retrieved transactions
+    }
+
+
     fun confirmCalled() {
         isTransferringMoney = true
 
@@ -72,7 +85,8 @@ fun TransferMoneyDialog(
             val successful = bankingService.transferMoney(
                 accountsToUserAccount[senderAccount]!!, senderAccount,
                 recipientName, recipientAccountIdentifier,
-                Amount(amount), "EUR", // TODO: add input field for currency
+                Amount(amount), // TODO: verify entered amount is valid
+                "EUR", // TODO: add input field for currency
                 paymentReference, instantTransfer && accountSupportsInstantTransfer
                 // TODO: determine BIC to IBAN
             )
@@ -111,13 +125,37 @@ fun TransferMoneyDialog(
         }
 
         Column(Modifier.padding(top = verticalSpace)) {
-            OutlinedTextField(
+            AutocompleteTextFieldNew(
-                value = recipientName,
+                "Name des Empfängers / der Empfängerin",
-                onValueChange = { recipientName = it },
+                dropdownMaxHeight = 350.dp,
-                label = { Text("Name des Empfängers / der Empfängerin") },
+                minTextLengthForSearch = 0,
-                modifier = Modifier.fillMaxWidth(),
+                onEnteredTextChanged = { recipientName = it },
-                keyboardOptions = KeyboardOptions(imeAction = ImeAction.Next)
+                onSelectedItemChanged = {
-            )
+                    if (it != null) {
+                        recipientName = it.name
+                        recipientAccountIdentifier = it.accountIdentifier
+                        // TODO: set recipient bank identifier
+                    } else {
+                        recipientName = ""
+                        recipientAccountIdentifier = ""
+                    }
+                },
+                fetchSuggestions = { query -> recipientFinder.findRecipients(query) }
+            ) { recipientSuggestion ->
+                Column(Modifier.fillMaxWidth()) {
+                    Text(recipientSuggestion.name)
+
+                    Row(Modifier.padding(top = 6.dp), verticalAlignment = Alignment.CenterVertically) {
+                        Text(recipientSuggestion.bankIdentifier ?: "", Modifier.width(105.dp))
+
+                        recipientSuggestion.bankInfo?.let { bank ->
+                            Text("${bank.name}, ${bank.city}", maxLines = 1, overflow = TextOverflow.Ellipsis)
+                        }
+                    }
+
+                    Text(recipientSuggestion.accountIdentifier, Modifier.padding(top = 6.dp))
+                }
+            }
 
             Spacer(modifier = Modifier.height(verticalSpace))
 

composeApp/src/commonMain/kotlin/net/codinux/banking/ui/forms/AutocompleteTextFieldNew.kt

@@ -0,0 +1,136 @@
+package net.codinux.banking.ui.forms
+
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.interaction.MutableInteractionSource
+import androidx.compose.foundation.layout.*
+import androidx.compose.material.*
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Close
+import androidx.compose.runtime.*
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.focus.FocusRequester
+import androidx.compose.ui.focus.focusProperties
+import androidx.compose.ui.focus.focusRequester
+import androidx.compose.ui.platform.LocalSoftwareKeyboardController
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.window.PopupProperties
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
+import net.codinux.banking.ui.config.Colors
+
+@OptIn(ExperimentalMaterialApi::class)
+@Composable
+fun <T> AutocompleteTextFieldNew(
+    label: String,
+    onSelectedItemChanged: (T?) -> Unit,
+    onEnteredTextChanged: ((String) -> Unit)? = null,
+    minTextLengthForSearch: Int = 1,
+    showDividersBetweenItems: Boolean = true,
+    getItemTitle: ((T) -> String)? = null,
+    dropdownMaxHeight: Dp = 400.dp,
+    leadingIcon: @Composable (() -> Unit)? = null,
+    fetchSuggestions: (query: String) -> Collection<T> = { emptyList() },
+    suggestionContent: @Composable (T) -> Unit
+) {
+    var searchQuery by remember { mutableStateOf("") }
+    var expanded by remember { mutableStateOf(false) }
+    var isLoading by remember { mutableStateOf(false) }
+    var suggestions by remember { mutableStateOf<Collection<T>>(emptyList()) }
+
+    val textFieldFocus = remember { FocusRequester() }
+    val keyboardController = LocalSoftwareKeyboardController.current
+    val interactionSource = remember { MutableInteractionSource() }
+
+    val coroutineScope = rememberCoroutineScope()
+
+
+    ExposedDropdownMenuBox(expanded, { isExpanded -> expanded = isExpanded }, Modifier.fillMaxWidth()) {
+        OutlinedTextField(
+            value = searchQuery,
+            onValueChange = { query ->
+                searchQuery = query
+                onSelectedItemChanged(null)
+                onEnteredTextChanged?.invoke(query)
+
+                if (query.length >= minTextLengthForSearch) {
+                    isLoading = true
+
+                    coroutineScope.launch {
+                        suggestions = fetchSuggestions(query)
+
+                        isLoading = false
+                        if (expanded == false) {
+                            expanded = true
+                        }
+
+                        // Delay to ensure menu is fully displayed before requesting focus
+                        delay(100)
+                        textFieldFocus.requestFocus() // Request focus back to TextField
+                        keyboardController?.show() // Show keyboard
+
+                        delay(1000)
+                        textFieldFocus.requestFocus()
+                        keyboardController?.show() // Show keyboard
+                    }
+                } else {
+                    suggestions = emptyList()
+                    expanded = false
+                }
+            },
+            modifier = Modifier.fillMaxWidth().focusRequester(textFieldFocus),
+            interactionSource = interactionSource,
+            label = { Text(label) },
+            maxLines = 1,
+            trailingIcon = {
+                if (isLoading) {
+                    CircularProgressIndicator(
+                        modifier = Modifier.size(24.dp),
+                        strokeWidth = 2.dp
+                    )
+                } else {
+                    Icon(
+                        imageVector = Icons.Default.Close,
+                        contentDescription = "Sucheingabe löschen",
+                        modifier = Modifier.clickable {
+                            searchQuery = ""
+                            suggestions = emptyList()
+                            expanded = false
+                            onSelectedItemChanged(null)
+                            textFieldFocus.requestFocus()
+                        }.focusProperties { canFocus = false }
+                    )
+                }
+            },
+            leadingIcon = leadingIcon
+        )
+
+        // due to a bug (still not fixed since 2021) in ExposedDropdownMenu its popup has a maximum width of 800 pixel / 320dp which is too less to fit
+        // TextField's width, see https://issuetracker.google.com/issues/205589613
+        DropdownMenu(
+            expanded = expanded && suggestions.isNotEmpty(),
+            onDismissRequest = { expanded = false },
+            Modifier.exposedDropdownSize(true).heightIn(max = dropdownMaxHeight),
+            properties = PopupProperties(focusable = false)
+        ) {
+            suggestions.forEachIndexed { index, item ->
+                Column(
+                    Modifier.fillMaxWidth().padding(8.dp).clickable {
+                        onSelectedItemChanged(item)
+                        getItemTitle?.let {
+                            searchQuery = it.invoke(item)
+                        }
+                        expanded = false
+                    }
+                ) {
+                    suggestionContent(item)
+                }
+
+                if (showDividersBetweenItems && index < suggestions.size - 1) {
+                    Divider(color = Colors.Zinc200, thickness = 1.dp)
+                }
+            }
+        }
+    }
+
+}

composeApp/src/commonMain/kotlin/net/codinux/banking/ui/model/RecipientSuggestion.kt

@@ -0,0 +1,8 @@
+package net.codinux.banking.ui.model
+
+data class RecipientSuggestion(
+    val name: String,
+    val bankIdentifier: String?,
+    val accountIdentifier: String,
+    var bankInfo: BankInfo? = null
+)

composeApp/src/commonMain/kotlin/net/codinux/banking/ui/service/BankFinder.kt

@@ -39,6 +39,44 @@ class BankFinder {
             .max(maxItems)
     }
 
+    suspend fun findBankByBicOrIban(bic: String?, iban: String): BankInfo? {
+        if (bic == null || iban.length < 9) {
+            return null
+        }
+
+        return findBankByBic(bic) ?: findBankByIban(iban)
+    }
+
+    suspend fun findBankByBic(bic: String): BankInfo? {
+        if (bic.length != 8 && bic.length != 11) {
+            return null
+        }
+
+        val result = getBankList().asSequence().filter { it.bic == bic || (bic.length == 8 && it.bic.startsWith(bic)) }.max(2)
+
+        return if (result.size > 1) { // non unique result, but should actually never happen for BICs
+            null
+        } else {
+            result.firstOrNull()
+        }
+    }
+
+    suspend fun findBankByIban(iban: String): BankInfo? {
+        if (iban.length < 9) {
+            return null
+        }
+
+        val bankCode = iban.substring(4) // first two letters are the country code, third and fourth char are the checksum, bank code starts at 5th char
+
+        val result = getBankList().asSequence().filter { it.bankCode.startsWith(bankCode) }.max(2)
+
+        return if (result.size > 1) { // non unique result, but should actually never happen for BICs
+            null
+        } else {
+            result.firstOrNull()
+        }
+    }
+
     suspend fun findBankByNameBankCodeOrCityForNonEmptyQuery(query: String, maxItems: Int?): List<BankInfo> {
         val queryPartsLowerCase = query.lowercase().split(" ", "-")
 

composeApp/src/commonMain/kotlin/net/codinux/banking/ui/service/RecipientFinder.kt

@@ -0,0 +1,43 @@
+package net.codinux.banking.ui.service
+
+import net.codinux.banking.client.model.AccountTransaction
+import net.codinux.banking.ui.model.RecipientSuggestion
+
+class RecipientFinder(private val bankFinder: BankFinder) {
+
+    private var availableRecipients: Set<RecipientSuggestion> = emptySet()
+
+
+    fun findRecipients(query: String): Collection<RecipientSuggestion> {
+        if (query.isBlank()) {
+            return availableRecipients
+        }
+
+        val singleTerms = query.lowercase().split(' ').filter { it.isNotBlank() }
+        val numericTerms = singleTerms.filter { it.toIntOrNull() != null }.toHashSet()
+
+        return availableRecipients.filter { recipient ->
+            val nameParts = recipient.name.lowercase().split(' ', '-').filter { it.isNotBlank() }
+            singleTerms.all { term ->
+                nameParts.any { it.startsWith(term) } ||
+                        (recipient.bankIdentifier != null && recipient.bankIdentifier.contains(term, true)) ||
+                        (numericTerms.contains(term) && recipient.accountIdentifier.contains(term))
+            }
+        }
+    }
+
+    suspend fun updateData(transactions: List<AccountTransaction>) {
+        availableRecipients = transactions.mapNotNull {
+            if (it.otherPartyName != null && it.otherPartyAccountId != null) {
+                RecipientSuggestion(it.otherPartyName!!, it.otherPartyBankCode, it.otherPartyAccountId!!)
+            } else {
+                null
+            }
+        }
+        .toSet()
+        .onEach { // do this after toSet() so that we don't have to call findBankByBicOrIban() for all the duplicates
+            it.bankInfo = bankFinder.findBankByBicOrIban(it.bankIdentifier, it.accountIdentifier)
+        }
+    }
+
+}