Implemented setting preferred TanMethodTypes and set it to NonVisualOrImageBase by default

BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/options/GetAccountDataOptions.kt

@@ -3,16 +3,43 @@ package net.codinux.banking.client.model.options
 import kotlinx.datetime.LocalDate
 import net.codinux.banking.client.model.BankAccountIdentifier
 import net.codinux.banking.client.model.config.NoArgConstructor
+import net.codinux.banking.client.model.tan.TanMethodType
 
 @NoArgConstructor
 open class GetAccountDataOptions(
-    val retrieveBalance: Boolean = true,
     val retrieveTransactions: RetrieveTransactions = RetrieveTransactions.OfLast90Days,
     val retrieveTransactionsFrom: LocalDate? = null,
     val retrieveTransactionsTo: LocalDate? = null,
+
+    val retrieveBalance: Boolean = true,
+
+    /**
+     * Account(s) may should be excluded from data retrieval, so this option enabled to set for which accounts data
+     * should be retrieved.
+     */
+    val accounts: List<BankAccountIdentifier> = emptyList(),
+
+    /**
+     * Specifies which [TanMethodType] should be preferred when having to choose between multiple available for user
+     * without requesting the user to choose one.
+     *
+     * By default we don't ask the user which TanMethod she prefers but choose one that could match best. If she really
+     * likes to use a different one, she can select another one in EnterTanDialog.
+     *
+     * By default we prefer non visual TanMethods (like AppTan and SMS) over image based TanMethods (like QR-code and
+     * photoTan) and exclude ChipTanUsb, which is not supported by application, and Flickercode, which is hard to
+     * implement and therefore most applications have not implemented.
+     *
+     * Console apps can only handle non visual TanMethods.
+     * But also graphical applications prefer non visual TanMethods as then they only have to display a text field to input
+     * TAN, and then image based TanMethods as then they additionally only have to display an image.
+     */
+    val preferredTanMethods: List<TanMethodType>? = TanMethodType.NonVisualOrImageBased,
+
     val abortIfTanIsRequired: Boolean = false,
-    // account(s) may should get excluded from data retrieval, so add option to set for which accounts data should be retrieved
-    val accounts: List<BankAccountIdentifier> = emptyList()
+
+    // there's also the option preferredTanMedium, but can hardly find a use case for it as we
+    // cannot know the TanMedium name upfront. In most cases there's only one TanMedium (per TanMethod) anyway.
 ) {
     override fun toString(): String {
         return "retrieveBalance=$retrieveBalance, retrieveTransactions=$retrieveTransactions, abortIfTanIsRequired=$abortIfTanIsRequired"

BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/tan/TanMethodType.kt

@@ -20,4 +20,21 @@ enum class TanMethodType {
     photoTan,
 
     QrCode
+    ;
+
+
+    companion object {
+
+        val NonVisual = listOf(TanMethodType.AppTan, TanMethodType.SmsTan, TanMethodType.ChipTanManuell, TanMethodType.EnterTan)
+
+        val ImageBased = listOf(TanMethodType.QrCode, TanMethodType.ChipTanQrCode, TanMethodType.photoTan, TanMethodType.ChipTanPhotoTanMatrixCode)
+
+        val NonVisualOrImageBased = buildList {
+            addAll(listOf(TanMethodType.AppTan, TanMethodType.SmsTan, TanMethodType.EnterTan))
+            addAll(ImageBased)
+            addAll(listOf(TanMethodType.ChipTanManuell)) // this is quite inconvenient for user, so i added it at last
+        }
+
+    }
+
 }