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/*
* This file is part of GNU Taler
* (C) 2020 Taler Systems S.A.
*
* GNU Taler is free software; you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation; either version 3, or (at your option) any later version.
*
* GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
package net.taler.wallet.transactions
import android.util.Log
import androidx.annotation.UiThread
import androidx.lifecycle.LiveData
import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.switchMap
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.launch
import net.taler.wallet.TAG
import net.taler.wallet.backend.WalletBackendApi
import net.taler.wallet.transactions.ExtendedStatus.Pending
import java.util.LinkedList
sealed class TransactionsResult {
class Error(val msg: String) : TransactionsResult()
class Success(val transactions: List<Transaction>) : TransactionsResult()
}
class TransactionManager(
private val api: WalletBackendApi,
private val scope: CoroutineScope,
) {
private val mProgress = MutableLiveData<Boolean>()
val progress: LiveData<Boolean> = mProgress
// FIXME if the app gets killed, this will not be restored and thus be unexpected null
// we should keep this in a savable, maybe using Hilt and SavedStateViewModel
var selectedCurrency: String? = null
val searchQuery = MutableLiveData<String>(null)
private val mSelectedTransaction = MutableLiveData<Transaction?>(null)
val selectedTransaction: LiveData<Transaction?> = mSelectedTransaction
private val allTransactions = HashMap<String, List<Transaction>>()
private val mTransactions = HashMap<String, MutableLiveData<TransactionsResult>>()
val transactions: LiveData<TransactionsResult>
@UiThread
get() = searchQuery.switchMap { query ->
val currency = selectedCurrency
check(currency != null) { "Did not select currency before getting transactions" }
loadTransactions(query)
mTransactions[currency]!! // non-null because filled in [loadTransactions]
}
@UiThread
fun loadTransactions(searchQuery: String? = null) = scope.launch {
val currency = selectedCurrency ?: return@launch
val liveData = mTransactions.getOrPut(currency) { MutableLiveData() }
if (searchQuery == null && allTransactions.containsKey(currency)) {
liveData.value = TransactionsResult.Success(allTransactions[currency]!!)
}
if (liveData.value == null) mProgress.value = true
api.request("getTransactions", Transactions.serializer()) {
if (searchQuery != null) put("search", searchQuery)
put("currency", currency)
}.onError {
liveData.postValue(TransactionsResult.Error(it.userFacingMsg))
mProgress.postValue(false)
}.onSuccess { result ->
val transactions = LinkedList(result.transactions)
// TODO remove when fixed in wallet-core
val comparator = compareBy<Transaction>(
{ it.extendedStatus == Pending },
{ it.timestamp.ms },
{ it.transactionId }
)
transactions.sortWith(comparator)
transactions.reverse() // show latest first
mProgress.value = false
liveData.value = TransactionsResult.Success(transactions)
// update selected transaction on UiThread (if it exists)
val selected = selectedTransaction.value
if (selected != null) transactions.find {
it.transactionId == selected.transactionId
}?.let {
mSelectedTransaction.value = it
}
// update all transactions on UiThread if there was a currency
if (searchQuery == null) allTransactions[currency] = transactions
}
}
/**
* Returns true if given [transactionId] was found and selected, false otherwise.
*/
@UiThread
suspend fun selectTransaction(transactionId: String): Boolean {
var transaction: Transaction? = null
api.request("getTransactionById", Transaction.serializer()) {
put("transactionId", transactionId)
}.onError {
Log.e(TAG, "Error getting transaction $it")
}.onSuccess { result ->
transaction = result
}
return if (transaction != null) {
mSelectedTransaction.value = transaction
true
} else {
false
}
}
fun selectTransaction(transaction: Transaction) {
mSelectedTransaction.postValue(transaction)
}
fun deleteTransaction(transactionId: String) = scope.launch {
api.request<Unit>("deleteTransaction") {
put("transactionId", transactionId)
}.onError {
Log.e(TAG, "Error deleteTransaction $it")
}.onSuccess {
// re-load transactions as our list is stale otherwise
loadTransactions()
}
}
fun deleteTransactions(transactionIds: List<String>) {
transactionIds.forEach { id ->
deleteTransaction(id)
}
}
}
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