package cash.z.ecc.android.sdk.demoapp.ui.screen.addresses.view

import androidx.compose.foundation.clickable
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.rememberScrollState
import androidx.compose.foundation.verticalScroll
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.ArrowBack
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBar
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.unit.dp
import cash.z.ecc.android.sdk.Synchronizer
import cash.z.ecc.android.sdk.demoapp.R
import cash.z.ecc.android.sdk.demoapp.model.WalletAddresses
import kotlinx.coroutines.flow.flow

// @Preview
// @Composable
// fun ComposablePreview() {
//     MaterialTheme {
//         Addresses()
//     }
// }

/**
 * @param copyToClipboard First string is a tag, the second string is the text to copy.
 */
@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun Addresses(
    synchronizer: Synchronizer,
    copyToClipboard: (String, String) -> Unit,
    onBack: () -> Unit
) {
    Scaffold(topBar = {
        AddressesTopAppBar(onBack)
    }) { paddingValues ->
        // TODO [#846]: Slow addresses providing
        // TODO [#846]: https://github.com/zcash/zcash-android-wallet-sdk/issues/846
        val walletAddresses = flow {
            emit(WalletAddresses.new(synchronizer))
        }.collectAsState(
            initial = null
        ).value
        if (null != walletAddresses) {
            AddressesMainContent(
                paddingValues = paddingValues,
                addresses = walletAddresses,
                copyToClipboard = copyToClipboard
            )
        }
    }
}

@Composable
@OptIn(ExperimentalMaterial3Api::class)
private fun AddressesTopAppBar(onBack: () -> Unit) {
    TopAppBar(
        title = { Text(text = stringResource(id = R.string.menu_address)) },
        navigationIcon = {
            IconButton(
                onClick = onBack
            ) {
                Icon(
                    imageVector = Icons.Filled.ArrowBack,
                    contentDescription = null
                )
            }
        }
    )
}

@Composable
private fun AddressesMainContent(
    paddingValues: PaddingValues,
    addresses: WalletAddresses,
    copyToClipboard: (String, String) -> Unit
) {
    Column(
        Modifier
            .verticalScroll(rememberScrollState())
            .padding(top = paddingValues.calculateTopPadding())
    ) {
        Text(stringResource(id = R.string.unified_address))
        addresses.unified.address.also { address ->
            val tag = stringResource(id = R.string.unified_address)

            Text(
                address,
                Modifier.clickable {
                    copyToClipboard(tag, address)
                }
            )
        }

        Spacer(Modifier.padding(8.dp))

        Text(stringResource(id = R.string.sapling_address))
        addresses.sapling.address.also { address ->
            val tag = stringResource(id = R.string.sapling_address_tag)

            Text(
                address,
                Modifier.clickable {
                    copyToClipboard(tag, address)
                }
            )
        }

        Spacer(Modifier.padding(8.dp))

        Text(stringResource(id = R.string.transparent_address))
        addresses.transparent.address.also { address ->
            val tag = stringResource(id = R.string.transparent_address)

            Text(
                address,
                Modifier.clickable {
                    copyToClipboard(tag, address)
                }
            )
        }
    }
}