voice-cat/clients/apple/iOS/VoiceCatiOS/Views/SettingsView.swift

import SwiftUI
import AVKit
import VoiceCatCore

struct SettingsView: View {
    @Environment(AppState.self) private var appState
    @Bindable var session: SessionState
    @StateObject private var router = IOSAudioRouter.shared

    var body: some View {
        NavigationStack {
            Form {
                // MARK: - Audio Input
                Section("Audio Input") {
                    // Input port picker (AVAudioSession.availableInputs)
                    Picker("Input Port", selection: Binding(
                        get: { router.selectedInputPortId ?? "" },
                        set: { id in
                            if !id.isEmpty { router.selectInputPort(id) }
                        }
                    )) {
                        Text("Default").tag("")
                        ForEach(router.inputPorts) { port in
                            Text(port.name).tag(port.id)
                        }
                    }
                    .accessibilityLabel("Audio input port selection")

                    // Built-in mic sub-options: orientation (data source) + polar pattern
                    if router.selectedPortIsBuiltInMic,
                       let dataSources = router.selectedPortDataSources,
                       !dataSources.isEmpty {
                        Picker("Mic Orientation", selection: Binding(
                            get: { router.selectedDataSourceId ?? "" },
                            set: { id in
                                if !id.isEmpty { router.selectDataSource(id) }
                            }
                        )) {
                            Text("Default").tag("")
                            ForEach(dataSources) { ds in
                                Text(ds.name).tag(ds.id)
                            }
                        }
                        .accessibilityLabel("Microphone orientation")

                        // Polar pattern sub-picker (only if the data source supports patterns)
                        if let selectedDs = dataSources.first(where: { $0.id == router.selectedDataSourceId }),
                           let patterns = selectedDs.polarPatterns,
                           !patterns.isEmpty {
                            Picker("Polar Pattern", selection: Binding(
                                get: { router.selectedPolarPattern ?? "" },
                                set: { pattern in
                                    if !pattern.isEmpty { router.selectPolarPattern(pattern) }
                                }
                            )) {
                                Text("Default").tag("")
                                ForEach(patterns, id: \.self) { pattern in
                                    Text(polarPatternLabel(pattern)).tag(pattern)
                                }
                            }
                            .accessibilityLabel("Microphone polar pattern")
                        }
                    }

                    // Mic processing mode: Standard vs Raw/Studio
                    Picker("Mic Mode", selection: Binding(
                        get: { router.micMode },
                        set: { router.selectMicMode($0) }
                    )) {
                        ForEach(IOSAudioRouter.MicMode.allCases) { mode in
                            Text(mode.rawValue).tag(mode)
                        }
                    }
                    .accessibilityLabel("Microphone processing mode")

                    if router.showsRawModeSpeakerWarning {
                        Label(
                            "Raw mode on speaker — echo risk (no AEC)",
                            systemImage: "exclamationmark.triangle.fill"
                        )
                        .foregroundStyle(.orange)
                        .font(.caption)
                        .accessibilityLabel("Warning: Raw mode with speaker output may cause echo")
                    }

                    if router.showsA2dpNoAecWarning {
                        Label(
                            "A2DP mode — no echo cancellation (hardware AEC unavailable)",
                            systemImage: "info.circle.fill"
                        )
                        .foregroundStyle(.blue)
                        .font(.caption)
                        .accessibilityLabel("Info: A2DP output mode does not support hardware echo cancellation")
                    }

                    // Capture channels: Mono vs Stereo
                    Picker("Channels", selection: Binding(
                        get: { router.captureChannels },
                        set: { router.selectCaptureChannels($0) }
                    )) {
                        ForEach(IOSAudioRouter.CaptureChannels.allCases) { ch in
                            Text(ch.rawValue).tag(ch)
                        }
                    }
                    .accessibilityLabel("Capture channel count")
                }

                // MARK: - Audio Output
                Section("Audio Output") {
                    // Bluetooth mode
                    Picker("Bluetooth Mode", selection: Binding(
                        get: { router.bluetoothMode },
                        set: { router.selectBluetoothMode($0) }
                    )) {
                        ForEach(IOSAudioRouter.BluetoothMode.allCases) { mode in
                            Text(mode.rawValue).tag(mode)
                        }
                    }
                    .accessibilityLabel("Bluetooth audio mode")

                    // Current output route (read-only)
                    if !router.outputRoutes.isEmpty {
                        ForEach(router.outputRoutes) { route in
                            HStack {
                                Text(route.name)
                                Spacer()
                                Text(route.portType)
                                    .foregroundStyle(.secondary)
                                    .font(.caption)
                            }
                            .accessibilityLabel("Current output: \(route.name)")
                        }
                    } else {
                        Text("No output route")
                            .foregroundStyle(.secondary)
                    }

                    // AirPlay button
                    HStack {
                        Text("AirPlay")
                        Spacer()
                        RoutePickerButton()
                    }
                    .accessibilityLabel("AirPlay output selector")
                }

                // MARK: - Voice
                Section("Voice") {
                    Picker("Input Mode", selection: Binding(
                        get: { session.voiceState.inputMode },
                        set: { session.setInputMode($0) }
                    )) {
                        Text("Voice Activation").tag(VoiceCatInputMode.voiceActivation)
                        Text("Push to Talk").tag(VoiceCatInputMode.pushToTalk)
                        Text("Always On").tag(VoiceCatInputMode.alwaysOn)
                    }
                    .accessibilityLabel("Voice input mode")

                    if session.voiceState.inputMode == .voiceActivation {
                        VStack(alignment: .leading, spacing: 4) {
                            Text("VAD Threshold: \(String(format: "%.3f", session.voiceState.vadThreshold))")
                                .font(.caption)
                            Slider(
                                value: Binding(
                                    get: { Double(session.voiceState.vadThreshold) },
                                    set: { session.setVadThreshold(Float($0)) }
                                ),
                                in: 0.001...0.1, step: 0.001
                            )
                            .accessibilityLabel("Voice activation threshold")
                        }
                    }
                }

                // MARK: - Admin
                if session.permissions.canAdminAccounts || session.permissions.isAdmin {
                    Section("Administration") {
                        NavigationLink("Manage Accounts") {
                            AccountsView(session: session)
                        }
                        .accessibilityLabel("Manage server accounts")
                    }
                }

                // MARK: - Server
                Section("Server") {
                    Button(role: .destructive) {
                        session.stopMicStream()
                        appState.disconnect()
                    } label: {
                        Label("Disconnect", systemImage: "phone.down")
                            .foregroundStyle(.red)
                    }
                    .accessibilityLabel("Disconnect from server")
                }

                // MARK: - About
                Section("About") {
                    Text(VoiceCatClient.versionString)
                        .font(.caption)
                        .foregroundStyle(.secondary)
                        .accessibilityLabel("Version: \(VoiceCatClient.versionString)")
                }
            }
            .navigationTitle("Settings")
            .onAppear {
                router.refreshRoutes()
            }
        }
    }

    /// Human-readable label for AVAudioSession.PolarPattern raw values.
    private func polarPatternLabel(_ rawValue: String) -> String {
        switch rawValue {
        case AVAudioSession.PolarPattern.omnidirectional.rawValue: return "Omnidirectional"
        case AVAudioSession.PolarPattern.cardioid.rawValue: return "Cardioid"
        case AVAudioSession.PolarPattern.subcardioid.rawValue: return "Subcardioid"
        default: return rawValue
        }
    }
}

/// SwiftUI wrapper for AVRoutePickerView (AVKit's UIView for AirPlay route selection).
private struct RoutePickerButton: UIViewRepresentable {
    func makeUIView(context: Context) -> AVRoutePickerView {
        let view = AVRoutePickerView()
        view.tintColor = .systemBlue
        return view
    }

    func updateUIView(_ uiView: AVRoutePickerView, context: Context) {}
}