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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 kotlinx.serialization.encodeToString
import kotlinx.serialization.json.Json
import net.taler.wallet.TAG
import net.taler.wallet.backend.TalerErrorInfo
import net.taler.wallet.backend.WalletBackendApi
import net.taler.wallet.balances.ScopeInfo
import net.taler.wallet.transactions.TransactionAction.Delete
import net.taler.wallet.transactions.TransactionMajorState.Pending
import org.json.JSONObject
import java.util.LinkedList
sealed class TransactionsResult {
class Error(val error: TalerErrorInfo) : 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 selectedScope: ScopeInfo? = null
val searchQuery = MutableLiveData<String>(null)
private val mSelectedTransaction = MutableLiveData<Transaction?>(null)
val selectedTransaction: LiveData<Transaction?> = mSelectedTransaction
private val allTransactions = HashMap<ScopeInfo, List<Transaction>>()
private val mTransactions = HashMap<ScopeInfo, MutableLiveData<TransactionsResult>>()
val transactions: LiveData<TransactionsResult>
@UiThread
get() = searchQuery.switchMap { query ->
val scopeInfo = selectedScope
check(scopeInfo != null) { "Did not select scope before getting transactions" }
loadTransactions(query)
mTransactions[scopeInfo]!! // non-null because filled in [loadTransactions]
}
@UiThread
fun loadTransactions(searchQuery: String? = null) = scope.launch {
val scopeInfo = selectedScope ?: return@launch
val liveData = mTransactions.getOrPut(scopeInfo) { MutableLiveData() }
if (searchQuery == null && allTransactions.containsKey(scopeInfo)) {
liveData.value = TransactionsResult.Success(allTransactions[scopeInfo]!!)
}
if (liveData.value == null) mProgress.value = true
api.request("getTransactions", Transactions.serializer()) {
if (searchQuery != null) put("search", searchQuery)
put("scopeInfo", JSONObject(Json.encodeToString(scopeInfo)))
}.onError {
liveData.postValue(TransactionsResult.Error(it))
mProgress.postValue(false)
}.onSuccess { result ->
val transactions = LinkedList(result.transactions)
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 scope info
if (searchQuery == null) allTransactions[scopeInfo] = 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
}
}
suspend fun getTransactionById(transactionId: String): Transaction? {
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 transaction
}
fun selectTransaction(transaction: Transaction) {
mSelectedTransaction.postValue(transaction)
}
fun deleteTransaction(transactionId: String, onError: (it: TalerErrorInfo) -> Unit) =
scope.launch {
api.request<Unit>("deleteTransaction") {
put("transactionId", transactionId)
}.onError {
onError(it)
}.onSuccess {
// re-load transactions as our list is stale otherwise
loadTransactions()
}
}
fun retryTransaction(transactionId: String, onError: (it: TalerErrorInfo) -> Unit) =
scope.launch {
api.request<Unit>("retryTransaction") {
put("transactionId", transactionId)
}.onError {
onError(it)
}.onSuccess {
loadTransactions()
}
}
fun abortTransaction(transactionId: String, onError: (it: TalerErrorInfo) -> Unit) =
scope.launch {
api.request<Unit>("abortTransaction") {
put("transactionId", transactionId)
}.onError {
onError(it)
}.onSuccess {
loadTransactions()
}
}
fun failTransaction(transactionId: String, onError: (it: TalerErrorInfo) -> Unit) =
scope.launch {
api.request<Unit>("failTransaction") {
put("transactionId", transactionId)
}.onError {
onError(it)
}.onSuccess {
loadTransactions()
}
}
fun suspendTransaction(transactionId: String, onError: (it: TalerErrorInfo) -> Unit) =
scope.launch {
api.request<Unit>("suspendTransaction") {
put("transactionId", transactionId)
}.onError {
onError(it)
}.onSuccess {
loadTransactions()
}
}
fun resumeTransaction(transactionId: String, onError: (it: TalerErrorInfo) -> Unit) =
scope.launch {
api.request<Unit>("resumeTransaction") {
put("transactionId", transactionId)
}.onError {
onError(it)
}.onSuccess {
loadTransactions()
}
}
fun deleteTransactions(transactionIds: List<String>, onError: (it: TalerErrorInfo) -> Unit) {
allTransactions[selectedScope]?.filter { transaction ->
transaction.transactionId in transactionIds
}?.forEach { toBeDeletedTx ->
if (Delete in toBeDeletedTx.txActions) {
deleteTransaction(toBeDeletedTx.transactionId) {
onError(it)
}
}
}
}
}
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