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                vm.batteryExemptionIntent()?.let { intent ->80                    runCatching { context.startActivity(intent) }81                }82            }83        }84    }8586    val animState = when (state) {87        is CodePairUiState.Paired -> PairingAnimState.CONNECTED88        is CodePairUiState.AwaitingPeerConfirmation -> PairingAnimState.LISTENING89        else -> PairingAnimState.WAITING90    }9192    ShellBackground {93        Column(94            modifier = Modifier95                .fillMaxSize()96                .systemBarsPadding()97                .padding(horizontal = PeachSpacing.lg, vertical = PeachSpacing.md),98        ) {99            if (state !is CodePairUiState.Failed ||100                (state as? CodePairUiState.Failed)?.reason != "ADOPT_PRO_REQUIRED"101            ) {102                Box(Modifier.fillMaxWidth().weight(1f), contentAlignment = Alignment.Center) {103                    BirdAnimation(animState, Modifier.fillMaxWidth().height(220.dp))104                }105            }106107            when (val s = state) {108                is CodePairUiState.Starting -> Headline("Starting…", "Opening a secure relay pairing room.")109110                is CodePairUiState.ShowingInvitation -> {111                    Headline(112                        "Pair a device",113                        "Scan this QR on the empty device. Peach will send this vault only after the 8-digit code matches.",114                    )115                    Spacer(Modifier.height(PeachSpacing.md))116                    PairingRelayChoice(117                        mode = syncMode,118                        configuredPrivateUrl = privateRelayUrl,119                        expanded = relayExpanded,120                        onExpandedChange = { relayExpanded = it },121                        onSelectMode = vm::selectRelayMode,122                        onSavePrivateUrl = vm::savePrivateRelayUrl,123                    )124                    if (!relayExpanded) {125                        PairingQrCode(126                            value = s.invitation,127                            modifier = Modifier128                                .fillMaxWidth()129                                .height(260.dp),130                        )131                    }132                }133134                is CodePairUiState.AwaitingPeerConfirmation -> {135                    Headline(136                        "Confirm on the scanning device",137                        "If this code matches there, tap “They match” on that device. " +138                            "Peach finishes only after both sides save the pairing.",139                    )140                    Spacer(Modifier.height(PeachSpacing.lg))141                    Text(142                        text = s.sas,143                        color = LocalPeachAccent.current,144                        fontFamily = PeachType.Mono,145                        fontSize = 38.sp,146                        letterSpacing = 6.sp,147                        textAlign = TextAlign.Center,148                        modifier = Modifier.fillMaxWidth(),149                    )150                }151152                is CodePairUiState.Paired -> {153                    Headline("Paired", "${s.deviceName} will now sync through the relay.")154                    Spacer(Modifier.height(PeachSpacing.lg))155                    PillButton("Done", LocalPeachAccent.current, filled = true, onClick = onBack)156                }157158                is CodePairUiState.Expired -> {159                    Headline(160                        "That code expired",161                        "Codes are good for five minutes so one doesn't stay live on a phone in your pocket. Nothing was lost.",162                    )163                    Spacer(Modifier.height(PeachSpacing.lg))164                    PillButton("Show a new code", LocalPeachAccent.current, filled = true) { vm.restart() }165                }166167                is CodePairUiState.Failed -> {168                    if (s.reason == "ADOPT_PRO_REQUIRED") {169                        PairingProRequired(170                            onRetry = vm::restart,171                            onOpenPro = onOpenPro,172                        )173                    } else {174                        Headline("Couldn't pair", failureCopy(s.reason))175                        Spacer(Modifier.height(PeachSpacing.md))176                        if (s.reason == "sync_disabled" || s.reason == "private_relay_unset") {177                            PairingRelayChoice(178                                mode = syncMode,179                                configuredPrivateUrl = privateRelayUrl,180                                expanded = true,181                                collapsible = false,182                                onExpandedChange = { relayExpanded = it },183                                onSelectMode = vm::selectRelayMode,184                                onSavePrivateUrl = vm::savePrivateRelayUrl,185                            )186                            Spacer(Modifier.height(PeachSpacing.md))187                        }188                        PillButton("Back", LocalPeachAccent.current, filled = true, onClick = onBack)189                    }190                }191            }192            Spacer(Modifier.height(PeachSpacing.md))193        }194    }195}196197@Composable198private fun PairingQrCode(value: String, modifier: Modifier = Modifier) {199    val matrix = remember(value) {200        QRCodeWriter().encode(value, BarcodeFormat.QR_CODE, 0, 0)201    }202    Canvas(modifier = modifier) {203        val side = minOf(size.width, size.height)204        val module = side / matrix.width205        val qrSize = module * matrix.width206        val origin = Offset((size.width - qrSize) / 2f, (size.height - qrSize) / 2f)207        drawRect(Color.White, topLeft = origin, size = Size(qrSize, qrSize))208        for (y in 0 until matrix.height) {209            for (x in 0 until matrix.width) {210                if (matrix[x, y]) {211                    drawRect(212                        Color.Black,213                        topLeft = Offset(origin.x + x * module, origin.y + y * module),214                        size = Size(module + 0.5f, module + 0.5f),215                    )216                }217            }218        }219    }220}221222/** Full-width pill used for every action on the pairing screens. */223@Composable224internal fun PillButton(225    label: String,226    color: Color,227    filled: Boolean,228    enabled: Boolean = true,229    onClick: () -> Unit,230) {231    val accent = LocalPeachAccent.current232    val buttonColor = if (filled) accent else color233    Box(234        modifier = Modifier235            .fillMaxWidth()236            .clip(RoundedCornerShape(14.dp))237            .background(238                if (filled) {239                    accent.copy(alpha = if (enabled) 0.14f else 0.05f)240                } else {241                    Color.Transparent242                },243            )244            .clickable(enabled = enabled, role = Role.Button, onClick = onClick)245            .padding(vertical = PeachSpacing.md),246        contentAlignment = Alignment.Center,247    ) {248        Text(249            label,250            color = buttonColor.copy(alpha = if (enabled) 1f else 0.38f),251            fontFamily = PeachType.Mono,252            fontSize = 13.sp,253        )254    }255}256257private fun failureCopy(reason: String): String = when (reason) {258    "ADOPT_PRO_REQUIRED" -> "Peach Pro is required on at least one paired device."259    "vault_locked" -> "Unlock your vault first — pairing shares the key that protects it."260    "no_local_network" -> "This phone isn't on a Wi-Fi network, so there's no address to hand out."261    "sas_mismatch" -> "The codes didn't match, so nothing was saved. That's the right outcome if you didn't expect a connection."262    "sync_disabled" -> "Sync is switched off for this vault. Turn it on in Settings → Sync first."263    // Pairing hands the relay address to the other device, so there is nothing264    // honest to put in the code until one exists.265    "private_relay_unset" -> "Private relay chosen but no address set. Enter your relay URL in Settings → Sync first."266    // Every other reason collapsed into this one sentence, which is fine for a267    // user and useless for anyone debugging: "bad_token", "no_hello" and a raw268    // exception message all looked identical on screen. Debug builds show the269    // real one.270    else -> "Something interrupted the connection. Try again."271        .let { if (BuildConfig.DEBUG) "$it\n\n[$reason]" else it }272}273274@Composable275private fun Headline(title: String, body: String) {276    Column(277        modifier = Modifier.fillMaxWidth(),278        horizontalAlignment = Alignment.CenterHorizontally,279        verticalArrangement = Arrangement.Center,280    ) {281        Text(282            title,283            color = peachColors.T0,284            fontFamily = PeachType.Display,285            fontStyle = FontStyle.Italic,286            fontSize = 22.sp,287            textAlign = TextAlign.Center,288        )289        Spacer(Modifier.height(PeachSpacing.xs))290        Text(291            body,292            color = peachColors.T2,293            fontFamily = PeachType.Body,294            fontSize = 13.sp,295            textAlign = TextAlign.Center,296        )297    }298}