CodePairScreen.kt

1package com.peachpasswords.ui.pairing23import com.peachpasswords.BuildConfig4import androidx.compose.foundation.background5import androidx.compose.foundation.clickable6import androidx.compose.foundation.shape.RoundedCornerShape7import androidx.compose.ui.draw.clip8import androidx.compose.ui.graphics.Color9import androidx.compose.foundation.layout.Arrangement10import androidx.compose.foundation.layout.Box11import androidx.compose.foundation.layout.Column12import androidx.compose.foundation.layout.Spacer13import androidx.compose.foundation.layout.fillMaxSize14import androidx.compose.foundation.layout.fillMaxWidth15import androidx.compose.foundation.layout.height16import androidx.compose.foundation.layout.padding17import androidx.compose.foundation.layout.systemBarsPadding18import androidx.compose.foundation.Canvas19import androidx.compose.material3.Text20import androidx.compose.runtime.Composable21import androidx.compose.runtime.LaunchedEffect22import androidx.compose.runtime.mutableStateOf23import androidx.compose.runtime.remember24import androidx.compose.runtime.setValue25import androidx.compose.runtime.getValue26import androidx.compose.ui.platform.LocalContext27import androidx.compose.ui.Alignment28import androidx.compose.ui.Modifier29import androidx.compose.ui.semantics.Role30import androidx.compose.ui.text.font.FontStyle31import androidx.compose.ui.text.style.TextAlign32import androidx.compose.ui.unit.dp33import androidx.compose.ui.unit.sp34import androidx.compose.ui.geometry.Offset35import androidx.compose.ui.geometry.Size36import androidx.hilt.navigation.compose.hiltViewModel37import androidx.lifecycle.compose.collectAsStateWithLifecycle38import com.peachpasswords.ui.components.BirdAnimation39import com.peachpasswords.ui.components.PairingAnimState40import com.peachpasswords.ui.theme.LocalPeachAccent41import com.peachpasswords.ui.theme.PeachSpacing42import com.peachpasswords.ui.theme.PeachType43import com.peachpasswords.ui.theme.ShellBackground44import com.peachpasswords.ui.theme.peachColors45import com.google.zxing.BarcodeFormat46import com.google.zxing.qrcode.QRCodeWriter4748/**49 * Pair a device by code. The phone shows the code; the browser types it in and50 * dials. Mirrors the extension's own phase structure (enter → connecting → sas51 * → paired), minus the entry field — the phone never types a code, it publishes52 * one.53 */54@Composable55fun CodePairScreen(56    onBack: () -> Unit,57    onOpenPro: () -> Unit = onBack,58    vm: CodePairViewModel = hiltViewModel(),59) {60    val state by vm.state.collectAsStateWithLifecycle()61    val syncMode by vm.syncMode.collectAsStateWithLifecycle()62    val privateRelayUrl by vm.privateRelayUrl.collectAsStateWithLifecycle()63    val context = LocalContext.current6465    var showBackgroundSyncPrompt by remember { mutableStateOf(false) }66    var relayExpanded by remember { mutableStateOf(false) }6768    LaunchedEffect(Unit) { vm.start() }6970    LaunchedEffect(state) {71        if (shouldPromptForBackgroundSync(state is CodePairUiState.Paired)) showBackgroundSyncPrompt = true72    }7374    if (showBackgroundSyncPrompt) {75        BackgroundSyncDialog { enabled ->76            showBackgroundSyncPrompt = false77            vm.setBackgroundSync(enabled)78            if (enabled) {79                // The dialog tap is the confirmation; when there's no exemption to80                // ask for (already granted, or already declined once) fall through81                // to the foreground-only sync path rather than doing nothing.82                val intent = vm.batteryExemptionIntent(userConfirmed = true)83                if (intent != null) runCatching { context.startActivity(intent) }84                else vm.syncOnce()85            }86        }87    }8889    val animState = when (state) {90        is CodePairUiState.Paired -> PairingAnimState.CONNECTED91        is CodePairUiState.AwaitingPeerConfirmation -> PairingAnimState.LISTENING92        else -> PairingAnimState.WAITING93    }9495    ShellBackground {96        Column(97            modifier = Modifier98                .fillMaxSize()99                .systemBarsPadding()100                .padding(horizontal = PeachSpacing.lg, vertical = PeachSpacing.md),101        ) {102            if (state !is CodePairUiState.Failed ||103                (state as? CodePairUiState.Failed)?.reason != "ADOPT_PRO_REQUIRED"104            ) {105                Box(Modifier.fillMaxWidth().weight(1f), contentAlignment = Alignment.Center) {106                    BirdAnimation(animState, Modifier.fillMaxWidth().height(220.dp))107                }108            }109110            when (val s = state) {111                is CodePairUiState.Starting -> Headline("Starting…", "Opening a secure relay pairing room.")112113                is CodePairUiState.ShowingInvitation -> {114                    Headline(115                        "Pair a device",116                        "Scan this QR on the empty device. Peach will send this vault only after the 8-digit code matches.",117                    )118                    Spacer(Modifier.height(PeachSpacing.md))119                    PairingRelayChoice(120                        mode = syncMode,121                        configuredPrivateUrl = privateRelayUrl,122                        expanded = relayExpanded,123                        onExpandedChange = { relayExpanded = it },124                        onSelectMode = vm::selectRelayMode,125                        onSavePrivateUrl = vm::savePrivateRelayUrl,126                    )127                    if (!relayExpanded) {128                        PairingQrCode(129                            value = s.invitation,130                            modifier = Modifier131                                .fillMaxWidth()132                                .height(260.dp),133                        )134                    }135                }136137                is CodePairUiState.AwaitingPeerConfirmation -> {138                    Headline(139                        "Confirm on the scanning device",140                        "If this code matches there, tap “They match” on that device. " +141                            "Peach finishes only after both sides save the pairing.",142                    )143                    Spacer(Modifier.height(PeachSpacing.lg))144                    Text(145                        text = s.sas,146                        color = LocalPeachAccent.current,147                        fontFamily = PeachType.Mono,148                        fontSize = 38.sp,149                        letterSpacing = 6.sp,150                        textAlign = TextAlign.Center,151                        modifier = Modifier.fillMaxWidth(),152                    )153                }154155                is CodePairUiState.Paired -> {156                    Headline("Paired", "${s.deviceName} will now sync through the relay.")157                    Spacer(Modifier.height(PeachSpacing.lg))158                    PillButton("Done", LocalPeachAccent.current, filled = true, onClick = onBack)159                }160161                is CodePairUiState.Expired -> {162                    Headline(163                        "That code expired",164                        "Codes are good for five minutes so one doesn't stay live on a phone in your pocket. Nothing was lost.",165                    )166                    Spacer(Modifier.height(PeachSpacing.lg))167                    PillButton("Show a new code", LocalPeachAccent.current, filled = true) { vm.restart() }168                }169170                is CodePairUiState.Failed -> {171                    if (s.reason == "ADOPT_PRO_REQUIRED") {172                        PairingProRequired(173                            onRetry = vm::restart,174                            onOpenPro = onOpenPro,175                        )176                    } else {177                        Headline("Couldn't pair", failureCopy(s.reason))178                        Spacer(Modifier.height(PeachSpacing.md))179                        if (s.reason == "sync_disabled" || s.reason == "private_relay_unset") {180                            PairingRelayChoice(181                                mode = syncMode,182                                configuredPrivateUrl = privateRelayUrl,183                                expanded = true,184                                collapsible = false,185                                onExpandedChange = { relayExpanded = it },186                                onSelectMode = vm::selectRelayMode,187                                onSavePrivateUrl = vm::savePrivateRelayUrl,188                            )189                            Spacer(Modifier.height(PeachSpacing.md))190                        }191                        PillButton("Back", LocalPeachAccent.current, filled = true, onClick = onBack)192                    }193                }194            }195            Spacer(Modifier.height(PeachSpacing.md))196        }197    }198}199200@Composable201private fun PairingQrCode(value: String, modifier: Modifier = Modifier) {202    val matrix = remember(value) {203        QRCodeWriter().encode(value, BarcodeFormat.QR_CODE, 0, 0)204    }205    Canvas(modifier = modifier) {206        val side = minOf(size.width, size.height)207        val module = side / matrix.width208        val qrSize = module * matrix.width209        val origin = Offset((size.width - qrSize) / 2f, (size.height - qrSize) / 2f)210        drawRect(Color.White, topLeft = origin, size = Size(qrSize, qrSize))211        for (y in 0 until matrix.height) {212            for (x in 0 until matrix.width) {213                if (matrix[x, y]) {214                    drawRect(215                        Color.Black,216                        topLeft = Offset(origin.x + x * module, origin.y + y * module),217                        size = Size(module + 0.5f, module + 0.5f),218                    )219                }220            }221        }222    }223}224225/** Full-width pill used for every action on the pairing screens. */226@Composable227internal fun PillButton(228    label: String,229    color: Color,230    filled: Boolean,231    enabled: Boolean = true,232    onClick: () -> Unit,233) {234    val accent = LocalPeachAccent.current235    val buttonColor = if (filled) accent else color236    Box(237        modifier = Modifier238            .fillMaxWidth()239            .clip(RoundedCornerShape(14.dp))240            .background(241                if (filled) {242                    accent.copy(alpha = if (enabled) 0.14f else 0.05f)243                } else {244                    Color.Transparent245                },246            )247            .clickable(enabled = enabled, role = Role.Button, onClick = onClick)248            .padding(vertical = PeachSpacing.md),249        contentAlignment = Alignment.Center,250    ) {251        Text(252            label,253            color = buttonColor.copy(alpha = if (enabled) 1f else 0.38f),254            fontFamily = PeachType.Mono,255            fontSize = 13.sp,256        )257    }258}259260private fun failureCopy(reason: String): String = when (reason) {261    "ADOPT_PRO_REQUIRED" -> "Peach Pro is required on at least one paired device."262    "vault_locked" -> "Unlock your vault first — pairing shares the key that protects it."263    "no_local_network" -> "This phone isn't on a Wi-Fi network, so there's no address to hand out."264    "sas_mismatch" -> "The codes didn't match, so nothing was saved. That's the right outcome if you didn't expect a connection."265    "sync_disabled" -> "Sync is switched off for this vault. Turn it on in Settings → Sync first."266    // Pairing hands the relay address to the other device, so there is nothing267    // honest to put in the code until one exists.268    "private_relay_unset" -> "Private relay chosen but no address set. Enter your relay URL in Settings → Sync first."269    // Every other reason collapsed into this one sentence, which is fine for a270    // user and useless for anyone debugging: "bad_token", "no_hello" and a raw271    // exception message all looked identical on screen. Debug builds show the272    // real one.273    else -> "Something interrupted the connection. Try again."274        .let { if (BuildConfig.DEBUG) "$it\n\n[$reason]" else it }275}276277@Composable278private fun Headline(title: String, body: String) {279    Column(280        modifier = Modifier.fillMaxWidth(),281        horizontalAlignment = Alignment.CenterHorizontally,282        verticalArrangement = Arrangement.Center,283    ) {284        Text(285            title,286            color = peachColors.T0,287            fontFamily = PeachType.Display,288            fontStyle = FontStyle.Italic,289            fontSize = 22.sp,290            textAlign = TextAlign.Center,291        )292        Spacer(Modifier.height(PeachSpacing.xs))293        Text(294            body,295            color = peachColors.T2,296            fontFamily = PeachType.Body,297            fontSize = 13.sp,298            textAlign = TextAlign.Center,299        )300    }301}