import OpenClawChatUI
import SwiftUI

struct CommandCenterTab: View {
    static let recentSessionsFetchLimit = 200

    @Environment(NodeAppModel.self) private var appModel
    @Environment(\.colorScheme) private var colorScheme
    @Environment(\.horizontalSizeClass) private var horizontalSizeClass
    @Environment(\.scenePhase) private var scenePhase
    @State private var defaultChatSessionEntry: OpenClawChatSessionEntry?
    @State private var recentChatSessions: [OpenClawChatSessionEntry] = []
    var ownsNavigationStack: Bool = true
    var usesNativeNavigationChrome: Bool = false
    var headerTitle: String = "OpenClaw"
    var headerLeadingAction: OpenClawSidebarHeaderAction?
    var showsHeaderMark: Bool = true
    var openChat: () -> Void
    var openSettings: () -> Void
    var openSessions: (() -> Void)?

    enum WorkRoute {
        case chat(String?)
        case settings
    }

    struct WorkItem: Identifiable {
        let id: String
        let icon: String
        let title: String
        let detail: String
        let state: String
        let trailing: String
        let color: Color
        let progress: Double?
        let route: WorkRoute
        let isUnread: Bool
        let isPinned: Bool
    }

    var body: some View {
        Group {
            if self.ownsNavigationStack {
                NavigationStack {
                    self.content
                }
            } else {
                self.content
            }
        }
        .task(id: self.recentSessionsRefreshID) {
            await self.refreshRecentSessionsIfNeeded()
        }
    }

    private var content: some View {
        GeometryReader { geometry in
            ZStack {
                CommandControlBackground()
                self.commandAmbientOverlay
                ScrollView {
                    VStack(alignment: .leading, spacing: 14) {
                        if !self.usesNativeNavigationChrome {
                            self.header
                        }
                        self.gatewayCard
                        if Self.usesSplitSectionsLayout(
                            horizontalSizeClass: self.horizontalSizeClass,
                            containerWidth: geometry.size.width)
                        {
                            HStack(alignment: .top, spacing: 12) {
                                self.defaultChatSessionSection
                                    .frame(maxWidth: .infinity, alignment: .topLeading)
                                self.recentSessions
                                    .frame(maxWidth: .infinity, alignment: .topLeading)
                            }
                            .padding(.horizontal, OpenClawProMetric.pagePadding)
                        } else {
                            self.defaultChatSessionSection
                                .padding(.horizontal, OpenClawProMetric.pagePadding)
                            self.recentSessions
                                .padding(.horizontal, OpenClawProMetric.pagePadding)
                        }
                    }
                    .padding(.top, 18)
                    .padding(.bottom, 18)
                }
                .safeAreaPadding(.bottom, OpenClawProMetric.bottomScrollInset)
            }
        }
        .navigationTitle(self.headerTitle)
        .navigationBarTitleDisplayMode(.inline)
        .toolbar(self.usesNativeNavigationChrome ? .visible : .hidden, for: .navigationBar)
        .toolbar {
            if self.usesNativeNavigationChrome {
                ToolbarItem(placement: .topBarTrailing) {
                    Button(action: self.openSettings) {
                        Image(systemName: "antenna.radiowaves.left.and.right")
                    }
                    .accessibilityLabel("Gateway settings")
                }
            }
        }
    }

    static func usesSplitSectionsLayout(
        horizontalSizeClass: UserInterfaceSizeClass?,
        containerWidth: CGFloat) -> Bool
    {
        guard horizontalSizeClass == .regular else { return false }
        return containerWidth >= 1000
    }

    static func shouldShowHeaderMark(
        hasLeadingAction: Bool,
        showsHeaderMark: Bool) -> Bool
    {
        !hasLeadingAction && showsHeaderMark
    }

    private var header: some View {
        OpenClawAdaptiveHeaderRow(
            title: self.headerTitle,
            subtitle: self.gatewaySubtitle,
            titleFont: OpenClawType.title3SemiBold,
            subtitleFont: OpenClawType.caption,
            subtitleLineLimit: 1)
        {
            if let headerLeadingAction {
                OpenClawSidebarHeaderLeadingSlot(action: headerLeadingAction)
            } else if Self.shouldShowHeaderMark(
                hasLeadingAction: headerLeadingAction != nil,
                showsHeaderMark: self.showsHeaderMark)
            {
                OpenClawProMark(size: 28, shadowRadius: 5)
            }
        } accessory: {
            Button(action: self.openSettings) {
                Image(systemName: "gearshape.fill")
                    .font(OpenClawType.subheadSemiBold)
                    .frame(width: OpenClawProMetric.compactControlSize, height: OpenClawProMetric.compactControlSize)
            }
            .openClawGlassButton()
            .accessibilityLabel("Gateway settings")
            .accessibilityHint("Opens gateway settings")
        }
        .padding(.horizontal, OpenClawProMetric.pagePadding)
    }

    private var commandAmbientOverlay: some View {
        Group {
            if self.colorScheme == .light {
                LinearGradient(
                    colors: [
                        Color.white.opacity(0.05),
                        Color.clear,
                    ],
                    startPoint: .top,
                    endPoint: .bottom)
                    .ignoresSafeArea()
                    .allowsHitTesting(false)
            }
        }
    }

    private var gatewayCard: some View {
        CommandPanel(isProminent: true, padding: 12) {
            VStack(alignment: .leading, spacing: 10) {
                self.cardHeader(title: "Gateway")

                HStack(spacing: 0) {
                    self.gatewayFact(
                        icon: "network",
                        title: "Connection",
                        value: self.gatewayConnectionText,
                        color: self.gatewayStatusColor)
                    Divider().frame(height: 38)
                    self.gatewayFact(
                        icon: "server.rack",
                        title: "Address",
                        value: self.gatewayAddressText,
                        color: OpenClawBrand.accentForeground)
                    Divider().frame(height: 38)
                    self.gatewayFact(
                        icon: "person.2.fill",
                        title: "Agents",
                        value: self.gatewayAgentCountText,
                        color: OpenClawBrand.accentHotForeground)
                }
                .padding(.vertical, 7)
            }
        }
        .padding(.horizontal, OpenClawProMetric.pagePadding)
    }

    private func gatewayFact(icon: String, title: String, value: String, color: Color) -> some View {
        VStack(alignment: .leading, spacing: 6) {
            HStack(spacing: 5) {
                Image(systemName: icon)
                    .font(OpenClawType.caption2Bold)
                    .foregroundStyle(color)
                Text(title)
                    .font(OpenClawType.caption2Medium)
                    .foregroundStyle(.secondary)
                    .lineLimit(1)
            }
            Text(value)
                .font(OpenClawType.captionSemiBold)
                .foregroundStyle(title == "Connection" ? color : .primary)
                .lineLimit(1)
                .minimumScaleFactor(0.72)
        }
        .frame(maxWidth: .infinity, alignment: .leading)
        .padding(.horizontal, 10)
    }

    private var defaultChatSessionSection: some View {
        CommandPanel(padding: 12) {
            VStack(spacing: 10) {
                self.cardHeader(title: "Agent session")

                Button {
                    self.openDefaultChatSession()
                } label: {
                    CommandSessionRow(item: self.defaultChatWorkItem)
                }
                .buttonStyle(.plain)
            }
        }
    }

    private var recentSessions: some View {
        CommandPanel(padding: 12) {
            VStack(spacing: 10) {
                self.cardHeader(title: "Recent sessions")

                if self.recentSessionPreviewSessions.isEmpty {
                    CommandEmptyStateRow(
                        icon: self.gatewayConnected ? "bubble.left.and.text.bubble.right.fill" : "wifi.slash",
                        title: self.gatewayConnected ? "No recent sessions" : "Gateway offline",
                        detail: self
                            .gatewayConnected ? "Start a chat and it will appear here." : "Connect to the gateway.")
                } else {
                    VStack(spacing: 8) {
                        ForEach(self.recentSessionPreviewSessions) { session in
                            let item = Self.sessionWorkItem(
                                for: session,
                                currentSessionKey: self.appModel.chatSessionKey)
                            Button {
                                self.open(session)
                            } label: {
                                CommandSessionRow(item: item)
                            }
                            .buttonStyle(.plain)
                            .commandSessionActions(
                                session: session,
                                categories: self.sessionCategories,
                                isEnabled: self.sessionControlsAvailable,
                                onRename: { self.patchSession(session, label: .some($0)) },
                                onMoveToGroup: { self.patchSession(session, category: .some($0)) },
                                onTogglePinned: { self.patchSession(session, pinned: session.pinned != true) },
                                onToggleUnread: { self.patchSession(session, unread: session.unread != true) },
                                onFork: { self.forkSession(session) },
                                onToggleArchived: { self.archiveSession(session) },
                                onDelete: { self.deleteSession(session) })
                        }

                        if self.hasMoreRecentSessions {
                            if let openSessions {
                                Button(action: openSessions) {
                                    CommandViewMoreRow()
                                }
                                .buttonStyle(.plain)
                            } else {
                                NavigationLink {
                                    CommandSessionsScreen(
                                        usesNativeNavigationChrome: self.usesNativeNavigationChrome,
                                        openChat: self.openChat)
                                } label: {
                                    CommandViewMoreRow()
                                }
                                .buttonStyle(.plain)
                            }
                        }
                    }
                }
            }
        }
    }

    private func cardHeader(title: String) -> some View {
        HStack(spacing: 8) {
            Text(title)
                .font(OpenClawType.subheadSemiBold)
                .foregroundStyle(.secondary)
            Spacer(minLength: 8)
        }
    }

    private var gatewayConnected: Bool {
        self.gatewayDisplayState == .connected
    }

    private var gatewayDisplayState: GatewayDisplayState {
        GatewayStatusBuilder.build(appModel: self.appModel)
    }

    private var gatewayConnectionText: String {
        switch self.gatewayDisplayState {
        case .connected:
            "Online"
        case .connecting:
            "Connecting"
        case .error:
            "Attention"
        case .disconnected:
            "Offline"
        }
    }

    private var gatewayStatusColor: Color {
        switch self.gatewayDisplayState {
        case .connected:
            OpenClawBrand.ok
        case .connecting:
            OpenClawBrand.accent
        case .error:
            OpenClawBrand.warn
        case .disconnected:
            .secondary
        }
    }

    private var gatewayAddressText: String {
        self.normalized(self.appModel.gatewayRemoteAddress)
            ?? self.normalized(self.appModel.gatewayServerName)
            ?? "Unknown"
    }

    private var gatewayAgentCountText: String {
        guard self.gatewayConnected else { return "—" }
        return "\(self.appModel.gatewayAgents.count)"
    }

    private var defaultChatWorkItem: WorkItem {
        let isOpen = self.appModel.chatSessionKey == self.appModel.defaultChatSessionKey
        return WorkItem(
            id: "default-chat",
            icon: isOpen ? "bubble.left.and.text.bubble.right.fill" : "bubble.left.fill",
            title: self.appModel.activeAgentName,
            detail: self.defaultChatActivityText,
            state: isOpen ? "open" : "default",
            trailing: "chat",
            color: isOpen ? OpenClawBrand.accent : OpenClawBrand.ok,
            progress: nil,
            route: .chat(nil),
            isUnread: self.defaultChatSessionEntry?.unread == true,
            isPinned: self.defaultChatSessionEntry?.pinned == true)
    }

    private var defaultChatActivityText: String {
        let activityAt = self.defaultChatSessionEntry?.lastActivityAt ?? self.defaultChatSessionEntry?.updatedAt
        guard let activityAt, activityAt > 0 else {
            return "No recent activity"
        }
        return Self.relativeTimeText(forMilliseconds: activityAt)
    }

    private var recentSessionPreviewSessions: [OpenClawChatSessionEntry] {
        CommandSessionGrouping.previewSelection(
            self.recentChatSessions,
            currentKey: self.appModel.chatSessionKey)
    }

    private var hasMoreRecentSessions: Bool {
        self.recentChatSessions.count > self.recentSessionPreviewSessions.count
    }

    private var sessionCategories: [String] {
        CommandSessionGrouping.categories(from: self.recentChatSessions)
    }

    private var sessionControlsAvailable: Bool {
        !self.appModel.isLocalChatFixtureEnabled && self.appModel.isOperatorGatewayConnected
    }

    private var recentSessionsRefreshID: String {
        [
            self.sessionListMode,
            self.appModel.chatSessionKey,
            self.scenePhase == .active ? "active" : "inactive",
        ].joined(separator: ":")
    }

    private var sessionListAvailable: Bool {
        self.appModel.isLocalChatFixtureEnabled || self.appModel.isOperatorGatewayConnected
    }

    private var sessionListMode: String {
        self.appModel.chatViewModelIdentityID
    }

    private func open(_ route: WorkRoute, unread: Bool = false) {
        switch route {
        case let .chat(sessionKey):
            self.appModel.openChat(sessionKey: sessionKey, unread: unread)
            self.openChat()
        case .settings:
            self.openSettings()
        }
    }

    private func open(_ session: OpenClawChatSessionEntry) {
        self.open(.chat(session.key), unread: session.unread == true)
    }

    private func openDefaultChatSession() {
        self.open(.chat(nil), unread: self.defaultChatSessionEntry?.unread == true)
    }

    private func patchSession(
        _ session: OpenClawChatSessionEntry,
        label: String?? = nil,
        category: String?? = nil,
        pinned: Bool? = nil,
        archived: Bool? = nil,
        unread: Bool? = nil)
    {
        self.performSessionMutation { transport in
            try await transport.patchSession(
                key: session.key,
                label: label,
                category: category,
                pinned: pinned,
                archived: archived,
                unread: unread)
        }
    }

    private func deleteSession(_ session: OpenClawChatSessionEntry) {
        self.performSessionMutation(resetActiveSessionKey: session.key) { transport in
            try await transport.deleteSession(key: session.key)
        }
    }

    private func archiveSession(_ session: OpenClawChatSessionEntry) {
        self.performSessionMutation(resetActiveSessionKey: session.key) { transport in
            try await transport.patchSession(
                key: session.key,
                label: nil,
                category: nil,
                pinned: nil,
                archived: true,
                unread: nil)
        }
    }

    private func forkSession(_ session: OpenClawChatSessionEntry) {
        Task {
            do {
                let key = try await self.appModel.makeChatTransport().forkSession(parentKey: session.key)
                await self.refreshRecentSessionsIfNeeded()
                self.open(.chat(key))
            } catch {}
        }
    }

    private func performSessionMutation(
        resetActiveSessionKey: String? = nil,
        _ operation: @escaping (any OpenClawChatTransport) async throws -> Void)
    {
        Task {
            do {
                try await operation(self.appModel.makeChatTransport())
                if resetActiveSessionKey == self.appModel.chatSessionKey {
                    self.appModel.focusChatSession(nil)
                }
                await self.refreshRecentSessionsIfNeeded()
            } catch {}
        }
    }

    private func refreshRecentSessionsIfNeeded() async {
        guard self.scenePhase == .active else { return }
        guard self.sessionListAvailable else {
            await self.applyCachedSessions()
            return
        }

        do {
            let transport = self.appModel.makeChatTransport()
            let response = try await transport.listSessions(limit: Self.recentSessionsFetchLimit)
            self.applySessions(response.sessions)
            self.appModel.reconcileChatSessionReadState(response.sessions)
            await self.appModel.storeCachedChatSessions(response.sessions)
        } catch {
            await self.applyCachedSessions()
        }
    }

    private func applyCachedSessions() async {
        let sessions = await self.appModel.loadCachedChatSessions()
        self.applySessions(sessions)
    }

    private func applySessions(_ sessions: [OpenClawChatSessionEntry]) {
        self.defaultChatSessionEntry = sessions.first {
            $0.key == self.appModel.defaultChatSessionKey
        }
        self.recentChatSessions = Self.sessionChoices(
            sessions,
            defaultSessionKey: self.appModel.defaultChatSessionKey)
    }

    private static func sessionChoices(
        _ sessions: [OpenClawChatSessionEntry],
        defaultSessionKey: String) -> [OpenClawChatSessionEntry]
    {
        sessions.filter {
            Self.isRecentChatSession($0.key, defaultSessionKey: defaultSessionKey)
        }
    }

    static func sessionWorkItem(
        for session: OpenClawChatSessionEntry,
        currentSessionKey: String) -> WorkItem
    {
        let isCurrent = session.key == currentSessionKey
        return WorkItem(
            id: "chat-session-\(session.key)",
            icon: isCurrent ? "bubble.left.and.text.bubble.right.fill" : "bubble.left.fill",
            title: Self.sessionTitle(session),
            detail: Self.sessionDetail(session),
            state: isCurrent ? "open" : "recent",
            trailing: "chat",
            color: isCurrent ? OpenClawBrand.accent : OpenClawBrand.ok,
            progress: nil,
            route: .chat(session.key),
            isUnread: session.unread == true,
            isPinned: session.pinned == true)
    }

    fileprivate static func sessionTitle(_ session: OpenClawChatSessionEntry) -> String {
        let label = session.label?.trimmingCharacters(in: .whitespacesAndNewlines)
        if let label, !label.isEmpty {
            return label
        }
        if let title = redactedSessionTitle(for: session.key) {
            return title
        }

        let displayName = session.displayName?.trimmingCharacters(in: .whitespacesAndNewlines)
        if let displayName, !displayName.isEmpty {
            return Self.redactedSessionTitle(for: displayName) ?? displayName
        }
        let subject = session.subject?.trimmingCharacters(in: .whitespacesAndNewlines)
        if let subject, !subject.isEmpty {
            return Self.redactedSessionTitle(for: subject) ?? subject
        }
        return session.key
    }

    fileprivate static func redactedSessionTitle(for key: String) -> String? {
        let trimmed = key.trimmingCharacters(in: .whitespacesAndNewlines)
        let lowercased = trimmed.lowercased()
        guard !trimmed.isEmpty else { return nil }
        if lowercased.contains(":ios-") {
            return "iOS chat"
        }
        if lowercased.hasPrefix("telegram:") {
            return "Telegram chat"
        }
        if lowercased.hasPrefix("user:+") {
            return "Direct chat"
        }
        if lowercased.hasPrefix("cron:") {
            return Self.humanizedSessionKey(String(trimmed.dropFirst("cron:".count)))
        }
        return nil
    }

    fileprivate static func humanizedSessionKey(_ key: String) -> String? {
        let words = key
            .replacingOccurrences(of: "_", with: "-")
            .split(separator: "-")
            .map(String.init)
            .filter { !$0.isEmpty }
        guard !words.isEmpty else { return nil }

        return words
            .map { word in
                switch word.lowercased() {
                case "ai", "api", "ios", "qmd", "url":
                    word.uppercased()
                default:
                    word.prefix(1).uppercased() + String(word.dropFirst())
                }
            }
            .joined(separator: " ")
    }

    fileprivate static func sessionDetail(_ session: OpenClawChatSessionEntry) -> String {
        let activityAt = session.lastActivityAt ?? session.updatedAt
        if let activityAt, activityAt > 0 {
            return self.relativeTimeText(forMilliseconds: activityAt)
        }
        return session.key
    }

    fileprivate static func relativeTimeText(forMilliseconds milliseconds: Double) -> String {
        let date = Date(timeIntervalSince1970: milliseconds / 1000)
        let formatter = RelativeDateTimeFormatter()
        formatter.dateTimeStyle = .numeric
        formatter.unitsStyle = .short
        return formatter.localizedString(for: date, relativeTo: .now)
    }

    fileprivate nonisolated static func isHiddenInternalSession(_ key: String) -> Bool {
        let trimmed = key.trimmingCharacters(in: .whitespacesAndNewlines)
        guard !trimmed.isEmpty else { return false }
        return trimmed == "onboarding" || trimmed.hasSuffix(":onboarding")
    }

    nonisolated static func isRecentChatSession(_ key: String, defaultSessionKey: String) -> Bool {
        let trimmed = key.trimmingCharacters(in: .whitespacesAndNewlines)
        guard !trimmed.isEmpty else { return false }
        if trimmed == defaultSessionKey { return false }
        let normalized = trimmed.lowercased()
        let defaultBase = self.sessionBaseKey(defaultSessionKey)
        if !normalized.contains(":"),
           self.isDirectSessionBase(normalized, defaultBase: defaultBase)
        {
            return false
        }
        if self.isHiddenInternalSession(trimmed) { return false }
        return !self.isAgentDeviceSession(trimmed, defaultSessionKey: defaultSessionKey)
    }

    private nonisolated static func isAgentDeviceSession(_ key: String, defaultSessionKey: String) -> Bool {
        let parts = key
            .trimmingCharacters(in: .whitespacesAndNewlines)
            .split(separator: ":", omittingEmptySubsequences: false)
        guard parts.count >= 3, parts[0].lowercased() == "agent" else { return false }
        guard parts.count == 3 || parts[3].lowercased() == "thread" else { return false }

        let base = String(parts[2]).trimmingCharacters(in: .whitespacesAndNewlines).lowercased()
        let defaultKey = self.sessionBaseKey(defaultSessionKey)
        return self.isDirectSessionBase(base, defaultBase: defaultKey)
    }

    private nonisolated static func isDirectSessionBase(_ base: String, defaultBase: String) -> Bool {
        base == defaultBase || base == "main" || base == "global" || base.hasPrefix("node-")
    }

    private nonisolated static func sessionBaseKey(_ key: String) -> String {
        let parts = key
            .trimmingCharacters(in: .whitespacesAndNewlines)
            .split(separator: ":", omittingEmptySubsequences: false)
        guard parts.count >= 3, parts[0].lowercased() == "agent" else {
            return key.trimmingCharacters(in: .whitespacesAndNewlines).lowercased()
        }
        return String(parts[2]).trimmingCharacters(in: .whitespacesAndNewlines).lowercased()
    }

    private var gatewaySubtitle: String {
        if let server = normalized(appModel.gatewayServerName) {
            return "\(self.appModel.activeAgentName) on \(server)"
        }
        if let address = normalized(appModel.gatewayRemoteAddress) {
            return "\(self.appModel.activeAgentName) via \(address)"
        }
        return self.appModel.gatewayDisplayStatusText
    }

    private func normalized(_ value: String?) -> String? {
        Self.normalized(value)
    }

    private static func normalized(_ value: String?) -> String? {
        guard let value else { return nil }
        let trimmed = value.trimmingCharacters(in: .whitespacesAndNewlines)
        return trimmed.isEmpty ? nil : trimmed
    }
}

struct CommandSessionsScreen: View {
    @Environment(NodeAppModel.self) private var appModel
    @Environment(\.dismiss) private var dismiss
    @State private var sessions: [OpenClawChatSessionEntry] = []
    @State private var isLoading = false
    @State private var loadErrorText: String?
    @State private var showArchived = false
    let headerLeadingAction: OpenClawSidebarHeaderAction?
    let usesNativeNavigationChrome: Bool
    let openChat: () -> Void

    init(
        headerLeadingAction: OpenClawSidebarHeaderAction? = nil,
        usesNativeNavigationChrome: Bool = false,
        openChat: @escaping () -> Void)
    {
        self.headerLeadingAction = headerLeadingAction
        self.usesNativeNavigationChrome = usesNativeNavigationChrome
        self.openChat = openChat
    }

    var body: some View {
        ZStack {
            CommandControlBackground()
            ScrollView {
                VStack(alignment: .leading, spacing: 10) {
                    if !self.usesNativeNavigationChrome {
                        self.header
                    }
                    self.sessionsPanel
                }
                .padding(.top, 16)
                .padding(.bottom, 18)
            }
            .safeAreaPadding(.bottom, OpenClawProMetric.bottomScrollInset)
        }
        .navigationTitle("Sessions")
        .navigationBarTitleDisplayMode(.inline)
        .toolbar(self.usesNativeNavigationChrome ? .visible : .hidden, for: .navigationBar)
        .task(id: self.refreshID) {
            await self.refreshSessions()
        }
    }

    private var header: some View {
        HStack(alignment: .top, spacing: 12) {
            if let headerLeadingAction {
                OpenClawSidebarHeaderLeadingSlot(action: headerLeadingAction)
            }

            VStack(alignment: .leading, spacing: 4) {
                Text("Sessions")
                    .font(OpenClawType.title2)
                Text(self.headerDetail)
                    .font(OpenClawType.captionMedium)
                    .foregroundStyle(.secondary)
            }
        }
        .padding(.horizontal, OpenClawProMetric.pagePadding)
    }

    private var sessionsPanel: some View {
        CommandPanel(padding: 0) {
            VStack(spacing: 0) {
                HStack(spacing: 8) {
                    Text(self.showArchived ? "Archived sessions" : "Recent sessions")
                        .font(OpenClawType.subheadBold)
                    Spacer(minLength: 8)
                    if self.isLoading {
                        ProgressView()
                            .controlSize(.small)
                    }
                    if self.sessionControlsAvailable {
                        Toggle(isOn: self.$showArchived) {
                            Text("Show Archived")
                                .font(OpenClawType.captionMedium)
                        }
                        .toggleStyle(.switch)
                        .controlSize(.mini)
                    }
                }
                .padding(.horizontal, 12)
                .padding(.top, 10)
                .padding(.bottom, 3)

                if let loadErrorText {
                    CommandEmptyStateRow(
                        icon: "exclamationmark.triangle.fill",
                        title: "Sessions unavailable",
                        detail: loadErrorText)
                        .padding(.horizontal, 10)
                        .padding(.bottom, 10)
                } else if self.visibleSessions.isEmpty {
                    CommandEmptyStateRow(
                        icon: self.appModel
                            .isCommandSessionListAvailable ? "bubble.left.and.text.bubble.right.fill" : "wifi.slash",
                        title: self.emptyTitle,
                        detail: self.appModel
                            .isCommandSessionListAvailable ? self.emptyDetail :
                            "Connect to the gateway.")
                        .padding(.horizontal, 10)
                        .padding(.bottom, 10)
                } else {
                    VStack(alignment: .leading, spacing: 10) {
                        ForEach(self.sessionSections) { section in
                            VStack(alignment: .leading, spacing: 6) {
                                if section.showsHeader {
                                    Text(section.title)
                                        .font(OpenClawType.captionSemiBold)
                                        .foregroundStyle(.secondary)
                                        .padding(.horizontal, 4)
                                }
                                ForEach(section.entries) { session in
                                    self.sessionRow(session)
                                }
                            }
                        }
                    }
                    .padding(.horizontal, 10)
                    .padding(.bottom, 10)
                }
            }
        }
        .padding(.horizontal, OpenClawProMetric.pagePadding)
    }

    private var headerDetail: String {
        if self.isLoading, self.sessions.isEmpty {
            return self.showArchived ? "Loading archived sessions" : "Loading recent sessions"
        }
        let count = self.visibleSessions.count
        if count == 0 {
            return self.emptyTitle
        }
        return "\(count) \(count == 1 ? "session" : "sessions")"
    }

    private var visibleSessions: [OpenClawChatSessionEntry] {
        self.sessions
            .filter { CommandCenterTab.isRecentChatSession(
                $0.key,
                defaultSessionKey: self.appModel.defaultChatSessionKey) }
            // Gate on the entry's own archived flag so a stale pre-toggle list can
            // never render active sessions with archived-only actions mid-refresh.
            .filter { self.showArchived ? $0.archived == true : $0.archived != true }
    }

    private var sessionSections: [CommandSessionSection] {
        CommandSessionGrouping.sections(from: self.visibleSessions)
    }

    private var sessionCategories: [String] {
        CommandSessionGrouping.categories(from: self.sessions)
    }

    private var sessionControlsAvailable: Bool {
        !self.appModel.isLocalChatFixtureEnabled && self.appModel.isOperatorGatewayConnected
    }

    private var emptyTitle: String {
        guard self.appModel.isCommandSessionListAvailable else { return "Gateway offline" }
        return self.showArchived ? "No archived sessions" : "No recent sessions"
    }

    private var emptyDetail: String {
        self.showArchived ? "Archived sessions will appear here." : "Start a chat and it will appear here."
    }

    private var refreshID: String {
        "\(self.appModel.commandSessionListMode):\(self.showArchived)"
    }

    private func sessionRow(_ session: OpenClawChatSessionEntry) -> some View {
        let item = CommandCenterTab.sessionWorkItem(
            for: session,
            currentSessionKey: self.appModel.chatSessionKey)
        return Button {
            self.open(session)
        } label: {
            CommandSessionRow(item: item)
        }
        .buttonStyle(.plain)
        .commandSessionActions(
            session: session,
            categories: self.sessionCategories,
            isArchived: session.archived == true,
            isEnabled: self.sessionControlsAvailable,
            onRename: { self.patchSession(session, label: .some($0)) },
            onMoveToGroup: { self.patchSession(session, category: .some($0)) },
            onTogglePinned: { self.patchSession(session, pinned: session.pinned != true) },
            onToggleUnread: { self.patchSession(session, unread: session.unread != true) },
            onFork: { self.forkSession(session) },
            onToggleArchived: { self.toggleArchived(session) },
            onDelete: { self.deleteSession(session) })
    }

    private func open(_ session: OpenClawChatSessionEntry) {
        self.openSessionKey(session.key, unread: session.unread == true)
    }

    private func openSessionKey(_ key: String, unread: Bool = false) {
        self.appModel.openChat(sessionKey: key, unread: unread)
        self.dismiss()
        self.openChat()
    }

    private func patchSession(
        _ session: OpenClawChatSessionEntry,
        label: String?? = nil,
        category: String?? = nil,
        pinned: Bool? = nil,
        archived: Bool? = nil,
        unread: Bool? = nil)
    {
        self.performMutation { transport in
            try await transport.patchSession(
                key: session.key,
                label: label,
                category: category,
                pinned: pinned,
                archived: archived,
                unread: unread)
        }
    }

    private func deleteSession(_ session: OpenClawChatSessionEntry) {
        self.performMutation(resetActiveSessionKey: session.key) { transport in
            try await transport.deleteSession(key: session.key)
        }
    }

    private func toggleArchived(_ session: OpenClawChatSessionEntry) {
        let archivesSession = !self.showArchived && session.archived != true
        self.performMutation(resetActiveSessionKey: archivesSession ? session.key : nil) { transport in
            try await transport.patchSession(
                key: session.key,
                label: nil,
                category: nil,
                pinned: nil,
                archived: archivesSession,
                unread: nil)
        }
    }

    private func forkSession(_ session: OpenClawChatSessionEntry) {
        Task {
            do {
                let key = try await self.appModel.makeChatTransport().forkSession(parentKey: session.key)
                await self.refreshSessions()
                self.openSessionKey(key)
            } catch {
                self.loadErrorText = error.localizedDescription
            }
        }
    }

    private func performMutation(
        resetActiveSessionKey: String? = nil,
        _ operation: @escaping (any OpenClawChatTransport) async throws -> Void)
    {
        Task {
            do {
                try await operation(self.appModel.makeChatTransport())
                if resetActiveSessionKey == self.appModel.chatSessionKey {
                    self.appModel.focusChatSession(nil)
                }
                await self.refreshSessions()
            } catch {
                self.loadErrorText = error.localizedDescription
            }
        }
    }

    private func refreshSessions() async {
        let requestsArchived = self.showArchived
        guard self.appModel.isCommandSessionListAvailable else {
            self.sessions = requestsArchived ? [] : await self.appModel.loadCachedChatSessions()
            self.loadErrorText = nil
            return
        }

        self.isLoading = true
        self.loadErrorText = nil
        defer { self.isLoading = false }

        do {
            let transport = self.appModel.makeChatTransport()
            let response = try await transport.listSessions(
                limit: CommandCenterTab.recentSessionsFetchLimit,
                archived: requestsArchived)
            guard requestsArchived == self.showArchived else { return }
            self.sessions = response.sessions
            if !requestsArchived {
                self.appModel.reconcileChatSessionReadState(response.sessions)
                await self.appModel.storeCachedChatSessions(response.sessions)
            }
        } catch {
            guard requestsArchived == self.showArchived else { return }
            self.sessions = requestsArchived ? [] : await self.appModel.loadCachedChatSessions()
            self.loadErrorText = self.sessions.isEmpty ? "Try again after the gateway reconnects." : nil
        }
    }
}

extension NodeAppModel {
    fileprivate var isCommandSessionListAvailable: Bool {
        self.isLocalChatFixtureEnabled || self.isOperatorGatewayConnected
    }

    fileprivate var commandSessionListMode: String {
        self.chatViewModelIdentityID
    }
}