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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 androidx.annotation.UiThread
import androidx.annotation.WorkerThread
import androidx.lifecycle.LiveData
import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.switchMap
import com.fasterxml.jackson.databind.ObjectMapper
import com.fasterxml.jackson.module.kotlin.readValue
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
import net.taler.wallet.backend.WalletBackendApi
import org.json.JSONObject
import java.util.*
sealed class TransactionsResult {
object Error : TransactionsResult()
class Success(val transactions: List<Transaction>) : TransactionsResult()
}
class TransactionManager(
private val walletBackendApi: WalletBackendApi,
private val scope: CoroutineScope,
private val mapper: ObjectMapper
) {
private val mProgress = MutableLiveData<Boolean>()
val progress: LiveData<Boolean> = mProgress
var selectedCurrency: String? = null
var selectedTransaction: Transaction? = null
val searchQuery = MutableLiveData<String>(null)
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) {
val currency = selectedCurrency ?: return
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
val request = JSONObject(mapOf("currency" to currency))
searchQuery?.let { request.put("search", it) }
walletBackendApi.sendRequest("getTransactions", request) { isError, result ->
if (isError) {
liveData.postValue(TransactionsResult.Error)
} else {
val currencyToUpdate = if (searchQuery == null) currency else null
scope.launch(Dispatchers.Default) {
onTransactionsLoaded(liveData, currencyToUpdate, result)
}
}
}
}
@WorkerThread
private fun onTransactionsLoaded(
liveData: MutableLiveData<TransactionsResult>,
currency: String?, // only non-null if we should update all transactions cache
result: JSONObject
) {
val transactionsArray = result.getString("transactions")
val transactions: LinkedList<Transaction> = mapper.readValue(transactionsArray)
// TODO remove when fixed in wallet-core
transactions.sortWith(compareBy({ it.pending }, { it.timestamp.ms }, { it.transactionId }))
transactions.reverse() // show latest first
mProgress.postValue(false)
liveData.postValue(TransactionsResult.Success(transactions))
// update all transactions on UiThread if there was a currency
currency?.let {
scope.launch(Dispatchers.Main) { allTransactions[currency] = transactions }
}
}
@UiThread
fun hasPending(currency: String): Boolean {
val result = mTransactions[currency]?.value ?: return false
return if (result is TransactionsResult.Success) {
result.transactions.any { it.pending }
} else false
}
}
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