RouterOS/RouterOSAssistant/Features/Devices/DevicesView.swift

import SwiftUI

/// "Geräte" tab: LAN scanner — one table per physical Ethernet/WLAN port, each listing the
/// devices resolved onto it (name/IP/MAC/status), plus right-click actions to give a device a
/// permanent static IP (Winbox's "Make Static") or remove that reservation again.
struct DevicesView: View {
    @ObservedObject var connectionService: ConnectionService
    @StateObject private var viewModel: DevicesViewModel
    @State private var rawFieldsDevice: LanDevice?
    /// Plain, independent Bool — deliberately NOT derived from `pendingStaticAssignment`.
    /// SwiftUI's `.confirmationDialog` calls the `isPresented` binding's setter with `false` on
    /// EVERY dismissal, including tapping "Zuweisen" itself — a computed binding that reacted to
    /// that by nil-ing `pendingStaticAssignment` was found to clear it before
    /// `confirmStaticAssignment()` could read it, so the confirmed action silently ran on `nil`
    /// and did nothing. Matches this app's own established, working pattern for confirmation
    /// dialogs elsewhere (BackupListView's factory-reset dialog): the dialog's own visibility and
    /// its payload are two separate pieces of state.
    @State private var showStaticConfirmation = false
    /// Same reasoning as `showStaticConfirmation` — independent of `pendingStaticRemoval`.
    @State private var showRemovalConfirmation = false

    init(connectionService: ConnectionService) {
        self.connectionService = connectionService
        _viewModel = StateObject(wrappedValue: DevicesViewModel(connectionService: connectionService))
    }

    var body: some View {
        NavigationStack {
            Group {
                if connectionService.credentials == nil {
                    ContentUnavailableView(
                        "Nicht verbunden",
                        systemImage: "network.slash",
                        description: Text("Verbinde dich zuerst im Tab \"Verbinden\" mit deinem Router.")
                    )
                } else if viewModel.isLoading && viewModel.devices.isEmpty {
                    ProgressView("Suche Geräte im Netz…")
                        .frame(maxWidth: .infinity, maxHeight: .infinity)
                } else if let error = viewModel.loadError, viewModel.devices.isEmpty {
                    ContentUnavailableView(
                        "Konnte Geräte nicht laden", systemImage: "exclamationmark.triangle",
                        description: Text(error)
                    )
                } else if viewModel.portGroups.isEmpty {
                    ContentUnavailableView(
                        "Keine Ports gefunden", systemImage: "wifi.slash",
                        description: Text("Der Router meldet aktuell keine physischen Interfaces.")
                    )
                } else {
                    Form {
                        ForEach(viewModel.portGroups) { group in
                            Section {
                                if group.devices.isEmpty {
                                    Text("Keine Geräte").font(.caption).foregroundStyle(.secondary)
                                } else {
                                    DeviceColumnHeader()
                                    ForEach(group.devices) { device in
                                        DeviceRow(device: device)
                                            .contextMenu {
                                                deviceMenu(for: device)
                                            }
                                    }
                                }
                            } header: {
                                Text("\(group.title) (\(group.devices.count))")
                            }
                        }
                    }
                    .formStyle(.grouped)
                }
            }
            .navigationTitle("Geräte")
            .toolbar {
                ToolbarItem {
                    Button {
                        Task { await viewModel.load() }
                    } label: {
                        if viewModel.isLoading {
                            ProgressView().controlSize(.small)
                        } else {
                            Label("Aktualisieren", systemImage: "arrow.clockwise")
                        }
                    }
                    .disabled(viewModel.isLoading)
                }
            }
            .task {
                if viewModel.devices.isEmpty {
                    await viewModel.load()
                }
            }
            .confirmationDialog(
                "Feste IP-Adresse zuweisen?",
                isPresented: $showStaticConfirmation,
                titleVisibility: .visible
            ) {
                Button("Zuweisen") {
                    Task { await viewModel.confirmStaticAssignment() }
                }
                Button("Abbrechen", role: .cancel) { viewModel.cancelStaticAssignment() }
            } message: {
                if let device = viewModel.pendingStaticAssignment {
                    Text(
                        "\(device.ipAddress) wird dauerhaft an \(device.macAddress)"
                        + (device.hostName.map { " (\($0))" } ?? "")
                        + " gebunden — die Adresse ändert sich für dieses Gerät nicht mehr automatisch."
                        + "\n\nBefehl: \(viewModel.pendingCommand?.cliLine ?? "")"
                    )
                }
            }
            .confirmationDialog(
                "Feste Zuweisung entfernen?",
                isPresented: $showRemovalConfirmation,
                titleVisibility: .visible
            ) {
                Button("Entfernen", role: .destructive) {
                    Task { await viewModel.confirmStaticRemoval() }
                }
                Button("Abbrechen", role: .cancel) { viewModel.cancelStaticRemoval() }
            } message: {
                if let device = viewModel.pendingStaticRemoval {
                    Text(
                        "Die feste Zuweisung für \(device.macAddress)"
                        + (device.hostName.map { " (\($0))" } ?? "")
                        + " wird entfernt. RouterOS kennt keine direkte Umkehrung von \"Make Static\" —"
                        + " das Gerät bekommt erst beim nächsten Verbindungsaufbau (Kabel/WLAN neu"
                        + " verbinden, Neustart) automatisch wieder eine Adresse per DHCP, eventuell"
                        + " eine andere IP als bisher."
                        + "\n\nBefehl: \(viewModel.pendingRemovalCommand?.cliLine ?? "")"
                    )
                }
            }
            .alert(
                "Fehler",
                isPresented: Binding(
                    get: { viewModel.applyError != nil },
                    set: { if !$0 { viewModel.dismissApplyError() } }
                ),
                presenting: viewModel.applyError
            ) { _ in
                Button("OK") {}
            } message: { error in
                Text(error)
            }
            .sheet(item: $rawFieldsDevice) { device in
                RawFieldsSheet(device: device) { rawFieldsDevice = nil }
            }
        }
    }

    @ViewBuilder
    private func deviceMenu(for device: LanDevice) -> some View {
        if device.hasLease {
            if device.isStatic {
                Button {
                    viewModel.pendingStaticRemoval = device
                    showRemovalConfirmation = true
                } label: {
                    Label("Feste Zuweisung entfernen", systemImage: "pin.slash")
                }
            } else {
                Button {
                    viewModel.pendingStaticAssignment = device
                    showStaticConfirmation = true
                } label: {
                    Label("Feste IP zuweisen", systemImage: "pin.fill")
                }
            }
        } else {
            Text("Kein DHCP-Lease — feste Zuweisung hier nicht möglich")
        }
        Divider()
        Button {
            rawFieldsDevice = device
        } label: {
            Label("Rohdaten anzeigen", systemImage: "list.bullet.rectangle")
        }
    }
}

/// Column widths shared between the header and each row so they line up like a real table.
private enum DeviceColumn {
    static let icon: CGFloat = 16
    static let name: CGFloat = 130
    static let ip: CGFloat = 110
    static let mac: CGFloat = 140
    static let status: CGFloat = 80
}

private struct DeviceColumnHeader: View {
    var body: some View {
        HStack(spacing: 8) {
            Spacer().frame(width: DeviceColumn.icon)
            Text("Name").frame(width: DeviceColumn.name, alignment: .leading)
            Text("IP-Adresse").frame(width: DeviceColumn.ip, alignment: .leading)
            Text("MAC-Adresse").frame(width: DeviceColumn.mac, alignment: .leading)
            Text("Status").frame(width: DeviceColumn.status, alignment: .leading)
            Spacer()
        }
        .font(.caption2.bold())
        .foregroundStyle(.secondary)
    }
}

private struct DeviceRow: View {
    let device: LanDevice

    /// Three distinct states, not two — a device with no matching DHCP lease at all is neither
    /// "Fest" (a real static reservation) nor "Dynamisch" (a real active lease); conflating it
    /// with "Fest" previously mislabeled every ARP-only device, DHCP clients included whenever
    /// their lease didn't get matched.
    private var statusIcon: String {
        guard device.hasLease else { return "questionmark.circle" }
        return device.isStatic ? "pin.fill" : "circle.fill"
    }

    private var statusColor: Color {
        guard device.hasLease else { return .secondary }
        return device.isStatic ? .orange : .green
    }

    private var statusText: String {
        guard device.hasLease else { return "Kein DHCP" }
        return device.isStatic ? "Fest" : "Dynamisch"
    }

    var body: some View {
        HStack(spacing: 8) {
            Image(systemName: statusIcon)
                .foregroundStyle(statusColor)
                .font(.system(size: 8))
                .frame(width: DeviceColumn.icon)
                .help(statusText)
            Text(device.hostName?.isEmpty == false ? device.hostName! : "-")
                .font(.system(size: 12))
                .lineLimit(1)
                .frame(width: DeviceColumn.name, alignment: .leading)
            Text(device.ipAddress)
                .font(.system(size: 12))
                .frame(width: DeviceColumn.ip, alignment: .leading)
            Text(device.macAddress)
                .font(.system(size: 11, design: .monospaced))
                .frame(width: DeviceColumn.mac, alignment: .leading)
            Text(statusText)
                .font(.caption)
                .foregroundStyle(.secondary)
                .frame(width: DeviceColumn.status, alignment: .leading)
            Spacer()
        }
        .padding(.vertical, 1)
    }
}

private struct RawFieldsSheet: View {
    let device: LanDevice
    let onClose: () -> Void

    var body: some View {
        VStack(alignment: .leading, spacing: 12) {
            Text("Rohdaten: \(device.macAddress)")
                .font(.headline)
            Text("Alle Felder, die RouterOS für diesen Eintrag zurückgegeben hat — hilfreich, falls Status/Port hier falsch aussieht.")
                .font(.caption)
                .foregroundStyle(.secondary)
            Divider()
            ScrollView {
                VStack(alignment: .leading, spacing: 4) {
                    ForEach(device.rawFields, id: \.key) { pair in
                        HStack(alignment: .top) {
                            Text(pair.key).font(.caption.monospaced()).foregroundStyle(.secondary)
                            Spacer()
                            Text(pair.value).font(.caption.monospaced()).multilineTextAlignment(.trailing)
                        }
                    }
                }
            }
            HStack {
                Spacer()
                Button("Schließen") { onClose() }
            }
        }
        .padding()
        .frame(minWidth: 380, minHeight: 300)
    }
}

#Preview {
    DevicesView(connectionService: ConnectionService())
}