EmptyBalancesComposable.kt

/*
 * This file is part of GNU Taler
 * (C) 2026 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.balances

import androidx.compose.foundation.Image
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.WindowInsets
import androidx.compose.foundation.layout.WindowInsetsSides
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.only
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.layout.systemBars
import androidx.compose.foundation.layout.windowInsetsPadding
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.material3.Button
import androidx.compose.material3.ButtonDefaults
import androidx.compose.material3.CircularProgressIndicator
import androidx.compose.material3.MaterialTheme
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.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.painterResource
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import net.taler.wallet.R
import net.taler.wallet.compose.Material3MenuGroup
import net.taler.wallet.compose.Material3MenuItemData
import net.taler.wallet.compose.TalerSurface

@Composable
fun EmptyBalancesComposable(
    innerPadding: PaddingValues,
    networkStatus: Boolean,
    onWithdrawMoneyClicked: () -> Unit,
    onGetDemoMoneyClicked: () -> Unit,
) {
    var loadingWithdraw by remember { mutableStateOf(false) }
    var loadingDemo by remember { mutableStateOf(false) }
    val enabled = networkStatus && !loadingWithdraw && !loadingDemo

    LazyColumn (
        modifier = Modifier
            .padding(innerPadding)
            .windowInsetsPadding(WindowInsets.systemBars.only(
                WindowInsetsSides.Top
            ))
            .padding(horizontal = 16.dp)
            .fillMaxSize(),
    ) {
        item { Spacer(Modifier.height(20.dp)) }

        item {
            Row(
                modifier = Modifier.fillMaxWidth(),
                horizontalArrangement = Arrangement.Center,
                verticalAlignment = Alignment.CenterVertically
            ) {
                Image(
                    modifier = Modifier
                        .height(45.dp)
                        .padding(end = 5.dp),
                    painter = painterResource(R.drawable.ic_taler_full),
                    contentDescription = null)

                Text(
                    stringResource(R.string.wallet),
                    style = MaterialTheme.typography.titleLarge,
                    fontWeight = FontWeight.Medium,
                )
            }
        }

        item { Spacer(Modifier.height(20.dp)) }

        item {
            Material3MenuGroup(buildList {
                add(Material3MenuItemData(
                    title = { Text(stringResource(R.string.balances_empty_withdraw_chf_title)) },
                    description = {
                        Column {
                            Text(stringResource(R.string.balances_empty_withdraw_chf_message))
                            Spacer(Modifier.height(6.dp))
                            Button(
                                modifier = Modifier.fillMaxWidth(),
                                onClick = {
                                    loadingWithdraw = true
                                    onWithdrawMoneyClicked()

                                },
                                enabled = enabled,
                            ) {
                                if (loadingWithdraw) {
                                    CircularProgressIndicator(Modifier.size(15.dp))
                                } else Text(
                                    color = if (enabled) {
                                        ButtonDefaults.buttonColors().contentColor
                                    } else {
                                        ButtonDefaults.buttonColors().disabledContentColor
                                    },
                                    text = stringResource(R.string.balances_empty_withdraw_chf_button),
                                )
                            }
                        }
                    },
                ))
            })
        }

        item { Spacer(Modifier.height(12.dp)) }

        item {
            Material3MenuGroup(buildList {
                add(
                    Material3MenuItemData(
                        title = {},
                        description = {
                            Column {
                                Text(stringResource(R.string.balances_empty_withdraw_kudos_message))
                                Spacer(Modifier.height(6.dp))
                                Button(
                                    modifier = Modifier.fillMaxWidth(),
                                    onClick = {
                                        loadingDemo = true
                                        onGetDemoMoneyClicked()
                                    },
                                    enabled = networkStatus && !(loadingWithdraw || loadingDemo),
                                ) {
                                    if (loadingDemo) {
                                        CircularProgressIndicator(Modifier.size(15.dp))
                                    } else Text(
                                        color = if (enabled) {
                                            ButtonDefaults.buttonColors().contentColor
                                        } else {
                                            ButtonDefaults.buttonColors().disabledContentColor
                                        },
                                        text = stringResource(R.string.balances_empty_withdraw_kudos_button),
                                    )
                                }
                            }
                        },
                    )
                )
            })
        }
    }
}

@Preview
@Composable
fun EmptyBalancesComposablePreview() {
    TalerSurface {
        EmptyBalancesComposable (
            innerPadding = PaddingValues(0.dp),
            networkStatus = false,
            onWithdrawMoneyClicked = {},
            onGetDemoMoneyClicked = {},
        )
    }
}