taler-android

PayToUriFragment.kt (7281B)

---

 /*
  * This file is part of GNU Taler
  * (C) 2022 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.deposit
 
 import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.material3.Button
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.ComposeView
 import androidx.compose.ui.platform.LocalFocusManager
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import androidx.core.os.bundleOf
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.activityViewModels
 import androidx.navigation.fragment.findNavController
 import net.taler.common.Amount
 import net.taler.common.CurrencySpecification
 import net.taler.wallet.main.AmountResult
 import net.taler.wallet.BottomInsetsSpacer
 import net.taler.wallet.main.MainViewModel
 import net.taler.wallet.R
 import net.taler.wallet.compose.AmountCurrencyField
 import net.taler.wallet.compose.TalerSurface
 import androidx.core.net.toUri
 
 class PayToUriFragment : Fragment() {
     private val model: MainViewModel by activityViewModels()
     private val depositManager get() = model.depositManager
     private val balanceManager get() = model.balanceManager
     private val exchangeManager get() = model.exchangeManager
 
     override fun onCreateView(
         inflater: LayoutInflater,
         container: ViewGroup?,
         savedInstanceState: Bundle?,
     ): View {
         val uri = arguments?.getString("uri") ?: error("no amount passed")
         val u = uri.toUri()
         val receiverName = u.getQueryParameter("receiver-name")
             ?.replace('+', ' ') ?: ""
         val iban = u.pathSegments.last() ?: ""
 
         val currencies = balanceManager.getCurrencies()
         return ComposeView(requireContext()).apply {
             setContent {
                 TalerSurface {
                     if (currencies.isEmpty()) Text(
                         text = stringResource(id = R.string.payment_balance_insufficient),
                         color = MaterialTheme.colorScheme.error,
                     ) else if (depositManager.isSupportedPayToUri(uri)) PayToComposable(
                         currencies = currencies,
                         getAmount = model::createAmount,
                         onAmountChosen = { amount ->
                             val bundle = bundleOf(
                                 "amount" to amount.toJSONString(),
                                 "receiverName" to receiverName,
                                 "IBAN" to iban,
                             )
                             findNavController().navigate(
                                 R.id.action_global_deposit, bundle)
                         },
                         getCurrencySpec = exchangeManager::getSpecForCurrency,
                     ) else Text(
                         text = stringResource(id = R.string.uri_invalid),
                         color = MaterialTheme.colorScheme.error,
                     )
                 }
             }
         }
     }
 
     override fun onStart() {
         super.onStart()
         activity?.setTitle(R.string.send_deposit_title)
     }
 
 }
 
 @Composable
 private fun PayToComposable(
     currencies: List<String>,
     getAmount: (String, String) -> AmountResult,
     getCurrencySpec: (String) -> CurrencySpecification?,
     onAmountChosen: (Amount) -> Unit,
 ) {
     val scrollState = rememberScrollState()
     Column(
         modifier = Modifier
             .fillMaxWidth()
             .padding(vertical = 16.dp)
             .verticalScroll(scrollState),
         horizontalAlignment = Alignment.CenterHorizontally,
         verticalArrangement = Arrangement.spacedBy(16.dp),
     ) {
         var amount by remember { mutableStateOf(Amount.zero(currencies[0])) }
         val currencySpec = remember(amount.currency) { getCurrencySpec(amount.currency) }
         var amountError by rememberSaveable { mutableStateOf("") }
 
         AmountCurrencyField(
             modifier = Modifier
                 .padding(horizontal = 16.dp)
                 .fillMaxWidth(),
             amount = amount.withSpec(currencySpec),
             currencies = currencies,
             readOnly = false,
             onAmountChanged = { amount = it },
             label = { Text(stringResource(R.string.amount_send)) },
             isError = amountError.isNotBlank(),
             supportingText = {
                 if (amountError.isNotBlank()) {
                     Text(amountError)
                 }
             }
         )
 
         val focusManager = LocalFocusManager.current
         val errorStrInvalidAmount = stringResource(id = R.string.amount_invalid)
         val errorStrInsufficientBalance = stringResource(id = R.string.payment_balance_insufficient)
         Button(
             modifier = Modifier.padding(16.dp),
             enabled = !amount.isZero(),
             onClick = {
                 when (val amountResult = getAmount(amount.amountStr, amount.currency)) {
                     is AmountResult.Success -> {
                         focusManager.clearFocus()
                         onAmountChosen(amountResult.amount)
                     }
                     is AmountResult.InvalidAmount -> amountError = errorStrInvalidAmount
                     is AmountResult.InsufficientBalance -> amountError = errorStrInsufficientBalance
                 }
             },
         ) {
             Text(text = stringResource(R.string.send_deposit_check_fees_button))
         }
 
         BottomInsetsSpacer()
     }
 }
 
 @Preview
 @Composable
 fun PreviewPayToComposable() {
     Surface {
         PayToComposable(
             currencies = listOf("KUDOS", "TESTKUDOS", "BTCBITCOIN"),
             getAmount = { _, _ -> AmountResult.InvalidAmount },
             onAmountChosen = {},
             getCurrencySpec = { null }
         )
     }
 }