tailscale-android/android/src/main/java/com/tailscale/ipn/ui/view/LoginQRView.kt

// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause

package com.tailscale.ipn.ui.view

import androidx.compose.foundation.Image
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.material3.Button
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Surface
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.unit.dp
import androidx.compose.ui.window.Dialog
import androidx.lifecycle.viewmodel.compose.viewModel
import com.tailscale.ipn.R
import com.tailscale.ipn.ui.viewModel.LoginQRViewModel

@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun LoginQRView(onDismiss: () -> Unit = {}, model: LoginQRViewModel = viewModel()) {
  Surface(color = MaterialTheme.colorScheme.scrim, modifier = Modifier.fillMaxSize()) {
    Dialog(onDismissRequest = onDismiss) {
      val image = model.qrCode.collectAsState()

      Column(
          modifier =
              Modifier.clip(RoundedCornerShape(10.dp))
                  .background(MaterialTheme.colorScheme.surfaceContainer)
                  .padding(20.dp),
          verticalArrangement = Arrangement.spacedBy(10.dp),
          horizontalAlignment = Alignment.CenterHorizontally) {
            Text(
                text = stringResource(R.string.scan_to_connect_to_your_tailnet),
                style = MaterialTheme.typography.titleMedium,
                color = MaterialTheme.colorScheme.onSurface)
            Box(
                modifier =
                    Modifier.size(200.dp)
                        .background(MaterialTheme.colorScheme.onSurface)
                        .fillMaxWidth(),
                contentAlignment = Alignment.Center) {
                  image.value?.let {
                    Image(
                        bitmap = it,
                        contentDescription = "Scan to login",
                        modifier = Modifier.fillMaxSize())
                  }
                }
            Button(onClick = onDismiss) { Text(text = stringResource(R.string.dismiss)) }
          }
    }
  }
}