// FaiSettingsDialog — modal for changing the hub endpoint.
// Reads current values from HubService, persists on save via
// HubService.reconnect.

import 'package:fai_dart_sdk/fai_dart_sdk.dart';
import 'package:flutter/material.dart';

import '../data/hub.dart';
import '../data/system_actions.dart';
import '../l10n/app_localizations.dart';
import '../theme/theme.dart';
import '../theme/tokens.dart';
import 'fai_error_box.dart';
import 'fai_pill.dart';
import 'fai_system_ai_editor.dart';

class FaiSettingsDialog extends StatefulWidget {
  const FaiSettingsDialog({super.key});

  /// Convenience launcher used from the sidebar gear icon.
  static Future<bool> show(BuildContext context) async {
    final ok = await showDialog<bool>(
      context: context,
      builder: (_) => const FaiSettingsDialog(),
    );
    return ok ?? false;
  }

  @override
  State<FaiSettingsDialog> createState() => _FaiSettingsDialogState();
}

class _FaiSettingsDialogState extends State<FaiSettingsDialog> {
  late final TextEditingController _host;
  late final TextEditingController _port;
  bool _secure = false;
  bool _saving = false;
  String? _error;
  String? _channelToast;
  ChannelStatusSnapshot? _channels;
  SystemAiStatus? _aiStatus;
  List<McpClientInfo>? _mcpClients;
  List<N8nEndpointInfo>? _n8nEndpoints;

  @override
  void initState() {
    super.initState();
    final ep = HubService.instance.currentEndpoint;
    _host = TextEditingController(text: ep.host);
    _port = TextEditingController(text: ep.port.toString());
    _secure = ep.secure;
    _loadChannels();
    _loadAiStatus();
    _loadMcpClients();
    _loadN8nEndpoints();
  }

  Future<void> _loadN8nEndpoints() async {
    try {
      final list = await HubService.instance.listN8nEndpoints();
      if (!mounted) return;
      setState(() => _n8nEndpoints = list);
    } catch (_) {/* fail-quiet */}
  }

  Future<void> _addN8nEndpoint(N8nEndpointDraft draft) async {
    try {
      final list = await HubService.instance.addN8nEndpoint(
        name: draft.name,
        baseUrl: draft.baseUrl,
        apiKeyEnv: draft.apiKeyEnv,
        description: draft.description,
      );
      if (!mounted) return;
      setState(() => _n8nEndpoints = list);
      final l = AppLocalizations.of(context)!;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text(l.addedN8nToast(draft.name))),
      );
    } catch (e) {
      if (!mounted) return;
      final l = AppLocalizations.of(context)!;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text(l.addFailedToast(e.toString()))),
      );
    }
  }

  Future<void> _removeN8nEndpoint(String name) async {
    try {
      final list = await HubService.instance.removeN8nEndpoint(name);
      if (!mounted) return;
      setState(() => _n8nEndpoints = list);
    } catch (e) {
      if (!mounted) return;
      final l = AppLocalizations.of(context)!;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text(l.removeFailedToast(e.toString()))),
      );
    }
  }

  Future<void> _refreshN8nEndpoints() async {
    try {
      final list = await HubService.instance.refreshN8nEndpoints();
      if (!mounted) return;
      setState(() => _n8nEndpoints = list);
    } catch (e) {
      if (!mounted) return;
      final l = AppLocalizations.of(context)!;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text(l.refreshFailedToast(e.toString()))),
      );
    }
  }

  Future<void> _loadMcpClients() async {
    try {
      final list = await HubService.instance.listMcpClients();
      if (!mounted) return;
      setState(() => _mcpClients = list);
    } catch (_) {
      // Same fail-quiet rule as channels.
    }
  }

  Future<void> _addMcpClient(McpClientDraft draft) async {
    try {
      final list = await HubService.instance.addMcpClient(
        name: draft.name,
        endpoint: draft.endpoint,
        apiKeyEnv: draft.apiKeyEnv,
        description: draft.description,
      );
      if (!mounted) return;
      setState(() => _mcpClients = list);
      final l = AppLocalizations.of(context)!;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text(l.addedMcpToast(draft.name))),
      );
    } catch (e) {
      if (!mounted) return;
      final l = AppLocalizations.of(context)!;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text(l.addFailedToast(e.toString()))),
      );
    }
  }

  Future<void> _removeMcpClient(String name) async {
    try {
      final list = await HubService.instance.removeMcpClient(name);
      if (!mounted) return;
      setState(() => _mcpClients = list);
    } catch (e) {
      if (!mounted) return;
      final l = AppLocalizations.of(context)!;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text(l.removeFailedToast(e.toString()))),
      );
    }
  }

  Future<void> _refreshMcpClients() async {
    try {
      final list = await HubService.instance.refreshMcpClients();
      if (!mounted) return;
      setState(() => _mcpClients = list);
    } catch (e) {
      if (!mounted) return;
      final l = AppLocalizations.of(context)!;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text(l.refreshFailedToast(e.toString()))),
      );
    }
  }

  Future<void> _loadChannels() async {
    try {
      final snap = await HubService.instance.channelStatus();
      if (!mounted) return;
      setState(() => _channels = snap);
    } catch (_) {
      // Silent: channels block stays hidden when the hub is
      // unreachable (the endpoint section is the operator's
      // path back to a working connection).
    }
  }

  Future<void> _loadAiStatus() async {
    try {
      final s = await HubService.instance.systemAiStatus();
      if (!mounted) return;
      setState(() => _aiStatus = s);
    } catch (_) {
      // Same fail-quiet rule as channels.
    }
  }

  Future<void> _switchChannel(String name) async {
    setState(() {
      _saving = true;
      _channelToast = null;
    });
    final r = await SystemActions.faiChannelSwitch(name);
    if (!mounted) return;
    setState(() {
      _saving = false;
      _channelToast = r.ok
          ? 'Switched active channel to "$name". Daemon restarted.\n${r.stdout.trim()}'
          : 'Channel switch failed: ${r.stderr.isEmpty ? r.stdout : r.stderr}';
    });
    if (r.ok) await _loadChannels();
  }

  Future<void> _runDaemon(
    String label,
    Future<({bool ok, String stdout, String stderr})> Function() action,
  ) async {
    setState(() {
      _saving = true;
      _channelToast = null;
    });
    final r = await action();
    if (!mounted) return;
    setState(() {
      _saving = false;
      _channelToast = r.ok
          ? 'OK · $label\n${r.stdout.trim()}'
          : 'Failed · $label\n${(r.stderr.isEmpty ? r.stdout : r.stderr).trim()}';
    });
  }

  Future<void> _connectToChannel(ChannelInfo ch) async {
    setState(() {
      _host.text = '127.0.0.1';
      _port.text = ch.port.toString();
      _secure = false;
    });
    await _save();
  }

  @override
  void dispose() {
    _host.dispose();
    _port.dispose();
    super.dispose();
  }

  Future<void> _save() async {
    setState(() {
      _saving = true;
      _error = null;
    });
    final port = int.tryParse(_port.text.trim());
    if (port == null || port <= 0 || port > 65535) {
      final l = AppLocalizations.of(context)!;
      setState(() {
        _saving = false;
        _error = l.settingsPortError;
      });
      return;
    }
    final endpoint = HubEndpoint(
      host: _host.text.trim().isEmpty ? '127.0.0.1' : _host.text.trim(),
      port: port,
      secure: _secure,
    );
    try {
      await HubService.instance.reconnect(endpoint);
      if (!mounted) return;
      Navigator.pop(context, true);
    } catch (e) {
      setState(() {
        _saving = false;
        _error = e.toString();
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final l = AppLocalizations.of(context)!;
    return AlertDialog(
      title: Text(l.settingsTitle),
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(FaiRadius.md),
      ),
      contentPadding: const EdgeInsets.symmetric(
        horizontal: FaiSpace.xl,
        vertical: FaiSpace.lg,
      ),
      content: ConstrainedBox(
        constraints: const BoxConstraints(maxWidth: 520, maxHeight: 640),
        child: SingleChildScrollView(
          child: Column(
            mainAxisSize: MainAxisSize.min,
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
            Text(
              l.settingsHubEndpointHint,
              style: theme.textTheme.bodySmall?.copyWith(
                color: theme.colorScheme.onSurfaceVariant,
              ),
            ),
            const SizedBox(height: FaiSpace.lg),
            TextField(
              controller: _host,
              decoration: InputDecoration(
                labelText: l.settingsHost,
                border: const OutlineInputBorder(),
                isDense: true,
              ),
              autofocus: true,
            ),
            const SizedBox(height: FaiSpace.md),
            Row(
              children: [
                Expanded(
                  flex: 2,
                  child: TextField(
                    controller: _port,
                    decoration: InputDecoration(
                      labelText: l.settingsPort,
                      border: const OutlineInputBorder(),
                      isDense: true,
                    ),
                    keyboardType: TextInputType.number,
                  ),
                ),
                const SizedBox(width: FaiSpace.md),
                Expanded(
                  flex: 3,
                  child: SwitchListTile(
                    contentPadding: EdgeInsets.zero,
                    dense: true,
                    title: Text(l.settingsTls),
                    subtitle: Text(
                      l.settingsTlsSubtitle,
                      style: theme.textTheme.bodySmall?.copyWith(
                        color: theme.colorScheme.onSurfaceVariant,
                      ),
                    ),
                    value: _secure,
                    onChanged: (v) => setState(() => _secure = v),
                  ),
                ),
              ],
            ),
            if (_error != null) ...[
              const SizedBox(height: FaiSpace.md),
              Text(
                _error!,
                style: theme.textTheme.bodySmall?.copyWith(
                  color: theme.colorScheme.error,
                ),
              ),
            ],
            const SizedBox(height: FaiSpace.md),
            Container(
              padding: const EdgeInsets.all(FaiSpace.sm),
              decoration: BoxDecoration(
                color: theme.colorScheme.surfaceContainerHigh,
                borderRadius: BorderRadius.circular(FaiRadius.sm),
              ),
              child: Row(
                children: [
                  Icon(
                    Icons.link,
                    size: 14,
                    color: theme.colorScheme.onSurfaceVariant,
                  ),
                  const SizedBox(width: FaiSpace.sm),
                  Text(
                    _previewUrl(),
                    style: FaiTheme.mono(
                      size: 11,
                      color: theme.colorScheme.onSurface,
                    ),
                  ),
                ],
              ),
            ),
            if (_channels != null) ...[
              const SizedBox(height: FaiSpace.lg),
              Text(
                l.channelsHeader,
                style: theme.textTheme.labelSmall?.copyWith(
                  color: theme.colorScheme.onSurfaceVariant,
                  letterSpacing: 0.6,
                  fontSize: 10,
                ),
              ),
              const SizedBox(height: 2),
              Text(
                l.channelsBlurb,
                style: theme.textTheme.bodySmall?.copyWith(
                  color: theme.colorScheme.onSurfaceVariant,
                ),
              ),
              const SizedBox(height: FaiSpace.sm),
              for (final ch in _channels!.channels)
                _ChannelRow(
                  channel: ch,
                  active: ch.name == _channels!.active,
                  onConnect: _saving ? null : () => _connectToChannel(ch),
                  onSwitch: _saving ? null : () => _switchChannel(ch.name),
                  onEnableAutostart: _saving ? null : () => _runDaemon(
                        'enable autostart',
                        () => SystemActions.faiDaemonEnable(ch.name),
                      ),
                  onDisableAutostart: _saving ? null : () => _runDaemon(
                        'disable autostart',
                        () => SystemActions.faiDaemonDisable(ch.name),
                      ),
                ),
              if (_channelToast != null) ...[
                const SizedBox(height: FaiSpace.sm),
                FaiErrorBox(text: _channelToast!, maxHeight: 200),
              ],
            ],
            if (_aiStatus != null) ...[
              const SizedBox(height: FaiSpace.lg),
              _SystemAiPanel(
                status: _aiStatus!,
                onEdit: () async {
                  final updated = await FaiSystemAiEditor.show(
                    context,
                    _aiStatus!,
                  );
                  if (updated != null && mounted) {
                    setState(() => _aiStatus = updated);
                  }
                },
              ),
            ],
            if (_mcpClients != null) ...[
              const SizedBox(height: FaiSpace.lg),
              _McpClientsPanel(
                clients: _mcpClients!,
                onAdd: _addMcpClient,
                onRemove: _removeMcpClient,
                onRefresh: _refreshMcpClients,
              ),
            ],
            if (_n8nEndpoints != null) ...[
              const SizedBox(height: FaiSpace.lg),
              _N8nEndpointsPanel(
                endpoints: _n8nEndpoints!,
                onAdd: _addN8nEndpoint,
                onRemove: _removeN8nEndpoint,
                onRefresh: _refreshN8nEndpoints,
              ),
            ],
          ],
        ),
        ),
      ),
      actions: [
        TextButton(
          onPressed: _saving ? null : () => Navigator.pop(context, false),
          child: Text(l.buttonCancel),
        ),
        FilledButton(
          onPressed: _saving ? null : _save,
          child: _saving
              ? const SizedBox(
                  width: 16,
                  height: 16,
                  child: CircularProgressIndicator(strokeWidth: 2),
                )
              : Text(l.settingsSaveAndConnect),
        ),
      ],
    );
  }

  String _previewUrl() {
    final scheme = _secure ? 'https' : 'http';
    final host =
        _host.text.trim().isEmpty ? '127.0.0.1' : _host.text.trim();
    final port = _port.text.trim().isEmpty ? '50051' : _port.text.trim();
    return '$scheme://$host:$port';
  }
}

class _ChannelRow extends StatelessWidget {
  final ChannelInfo channel;
  final bool active;
  final VoidCallback? onConnect;
  /// Switches the active channel pointer (`fai channel switch`).
  /// Distinct from [onConnect], which only re-points Studio's
  /// gRPC wire at a different running daemon.
  final VoidCallback? onSwitch;
  final VoidCallback? onEnableAutostart;
  final VoidCallback? onDisableAutostart;

  const _ChannelRow({
    required this.channel,
    required this.active,
    required this.onConnect,
    required this.onSwitch,
    required this.onEnableAutostart,
    required this.onDisableAutostart,
  });

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final l = AppLocalizations.of(context)!;
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 4),
      child: Row(
        children: [
          Icon(
            channel.running ? Icons.circle : Icons.circle_outlined,
            size: 10,
            color: channel.running
                ? FaiColors.success
                : theme.colorScheme.outline,
          ),
          const SizedBox(width: FaiSpace.sm),
          SizedBox(
            width: 88,
            child: Text(
              channel.name,
              style: FaiTheme.mono(
                size: 11,
                weight: active ? FontWeight.w600 : FontWeight.w400,
                color: theme.colorScheme.onSurface,
              ),
            ),
          ),
          SizedBox(
            width: 64,
            child: Text(
              ':${channel.port}',
              style: FaiTheme.mono(
                size: 11,
                color: theme.colorScheme.onSurfaceVariant,
              ),
            ),
          ),
          Expanded(
            child: Text(
              channel.running ? l.channelsRunning : l.channelsStopped,
              style: theme.textTheme.bodySmall?.copyWith(
                color: theme.colorScheme.onSurfaceVariant,
              ),
            ),
          ),
          if (active)
            Padding(
              padding: const EdgeInsets.only(right: FaiSpace.sm),
              child: FaiPill(label: l.channelsActive, tone: FaiPillTone.success),
            ),
          PopupMenuButton<String>(
            tooltip: l.channelsActionsTooltip,
            icon: const Icon(Icons.more_vert, size: 18),
            onSelected: (v) {
              switch (v) {
                case 'connect':
                  onConnect?.call();
                  break;
                case 'switch':
                  onSwitch?.call();
                  break;
                case 'enable':
                  onEnableAutostart?.call();
                  break;
                case 'disable':
                  onDisableAutostart?.call();
                  break;
              }
            },
            itemBuilder: (_) => [
              PopupMenuItem(
                value: 'connect',
                enabled: channel.running && onConnect != null,
                child: _MenuRow(
                  icon: Icons.link,
                  text: l.channelsConnect,
                ),
              ),
              PopupMenuItem(
                value: 'switch',
                enabled: !active && onSwitch != null,
                child: _MenuRow(
                  icon: Icons.swap_horiz,
                  text: l.channelsSwitch,
                ),
              ),
              const PopupMenuDivider(),
              PopupMenuItem(
                value: 'enable',
                enabled: onEnableAutostart != null,
                child: _MenuRow(
                  icon: Icons.play_circle_outline,
                  text: l.channelsEnableAutostart,
                ),
              ),
              PopupMenuItem(
                value: 'disable',
                enabled: onDisableAutostart != null,
                child: _MenuRow(
                  icon: Icons.pause_circle_outline,
                  text: l.channelsDisableAutostart,
                ),
              ),
            ],
          ),
        ],
      ),
    );
  }
}

class _MenuRow extends StatelessWidget {
  final IconData icon;
  final String text;
  const _MenuRow({required this.icon, required this.text});

  @override
  Widget build(BuildContext context) {
    return Row(
      children: [
        Icon(icon, size: 14),
        const SizedBox(width: FaiSpace.sm),
        Text(text),
      ],
    );
  }
}

class _SystemAiPanel extends StatelessWidget {
  final SystemAiStatus status;
  final VoidCallback onEdit;

  const _SystemAiPanel({required this.status, required this.onEdit});

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final l = AppLocalizations.of(context)!;
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Row(
          children: [
            Text(
              l.systemAiHeader,
              style: theme.textTheme.labelSmall?.copyWith(
                color: theme.colorScheme.onSurfaceVariant,
                letterSpacing: 0.6,
                fontSize: 10,
              ),
            ),
            const SizedBox(width: FaiSpace.sm),
            FaiPill(
              label: status.enabled ? l.systemAiEnabled : l.systemAiOff,
              tone: status.enabled ? FaiPillTone.success : FaiPillTone.neutral,
            ),
            if (status.enabled) ...[
              const SizedBox(width: FaiSpace.xs),
              FaiPill(
                label: status.privacyMode,
                tone: status.privacyMode == 'full'
                    ? FaiPillTone.warning
                    : FaiPillTone.neutral,
              ),
            ],
            const Spacer(),
            TextButton.icon(
              onPressed: onEdit,
              icon: const Icon(Icons.edit_outlined, size: 14),
              label: Text(status.enabled ? l.systemAiEdit : l.systemAiConfigure),
            ),
          ],
        ),
        const SizedBox(height: 4),
        if (status.enabled) ...[
          _StatRow(label: 'provider', value: status.provider),
          _StatRow(label: 'endpoint', value: status.endpoint, mono: true),
          _StatRow(label: 'model', value: status.model, mono: true),
          if (status.apiKeyEnv.isNotEmpty)
            _StatRow(label: 'api_key_env', value: '\$${status.apiKeyEnv}', mono: true),
        ] else ...[
          Padding(
            padding: const EdgeInsets.only(top: 2),
            child: Text(
              l.systemAiOffBlurb,
              style: theme.textTheme.bodySmall?.copyWith(
                color: theme.colorScheme.onSurfaceVariant,
              ),
            ),
          ),
        ],
      ],
    );
  }
}

class _StatRow extends StatelessWidget {
  final String label;
  final String value;
  final bool mono;

  const _StatRow({
    required this.label,
    required this.value,
    this.mono = false,
  });

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 1),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          SizedBox(
            width: 96,
            child: Text(
              label,
              style: theme.textTheme.labelSmall?.copyWith(
                color: theme.colorScheme.onSurfaceVariant,
              ),
            ),
          ),
          Expanded(
            child: Text(
              value.isEmpty ? '—' : value,
              style: mono
                  ? FaiTheme.mono(size: 11, color: theme.colorScheme.onSurface)
                  : theme.textTheme.bodySmall,
            ),
          ),
        ],
      ),
    );
  }
}

/// Draft passed back from the add-server dialog. Kept tiny so
/// the panel can stay stateless.
class McpClientDraft {
  final String name;
  final String endpoint;
  final String apiKeyEnv;
  final String description;
  const McpClientDraft({
    required this.name,
    required this.endpoint,
    required this.apiKeyEnv,
    required this.description,
  });
}

/// MCP-clients panel — shows every configured server with its
/// last-discovery health, plus Add / Remove / Refresh actions.
/// Configure a server here, the store gains synthetic
/// capabilities for every advertised tool. Mirrors `fai mcp …`
/// on the CLI.
class _McpClientsPanel extends StatelessWidget {
  final List<McpClientInfo> clients;
  final ValueChanged<McpClientDraft> onAdd;
  final ValueChanged<String> onRemove;
  final VoidCallback onRefresh;

  const _McpClientsPanel({
    required this.clients,
    required this.onAdd,
    required this.onRemove,
    required this.onRefresh,
  });

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final l = AppLocalizations.of(context)!;
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Row(
          children: [
            Text(
              l.mcpHeader,
              style: theme.textTheme.labelSmall?.copyWith(
                color: theme.colorScheme.onSurfaceVariant,
                letterSpacing: 0.6,
                fontSize: 10,
              ),
            ),
            const SizedBox(width: FaiSpace.sm),
            FaiPill(
              label: l.mcpServersCount(clients.length),
              tone: FaiPillTone.neutral,
            ),
            const Spacer(),
            IconButton(
              icon: const Icon(Icons.refresh, size: 16),
              tooltip: l.mcpRediscoverTooltip,
              visualDensity: VisualDensity.compact,
              onPressed: onRefresh,
            ),
            IconButton(
              icon: const Icon(Icons.add, size: 16),
              tooltip: l.mcpAddTooltip,
              visualDensity: VisualDensity.compact,
              onPressed: () async {
                final draft = await _AddMcpClientDialog.show(context);
                if (draft != null) onAdd(draft);
              },
            ),
          ],
        ),
        const SizedBox(height: 2),
        Text(
          l.mcpHint,
          style: theme.textTheme.bodySmall?.copyWith(
            color: theme.colorScheme.onSurfaceVariant,
          ),
        ),
        const SizedBox(height: FaiSpace.sm),
        if (clients.isEmpty)
          Padding(
            padding: const EdgeInsets.symmetric(vertical: FaiSpace.sm),
            child: Text(
              l.mcpEmpty,
              style: theme.textTheme.bodySmall?.copyWith(
                color: theme.colorScheme.onSurfaceVariant,
              ),
            ),
          )
        else
          for (final c in clients)
            _McpClientRow(
              client: c,
              onRemove: () => onRemove(c.name),
            ),
      ],
    );
  }
}

class _McpClientRow extends StatelessWidget {
  final McpClientInfo client;
  final VoidCallback onRemove;
  const _McpClientRow({required this.client, required this.onRemove});

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final l = AppLocalizations.of(context)!;
    final ok = client.healthy;
    final dotColor = client.errorKind.isEmpty
        ? (ok ? FaiColors.success : FaiColors.muted)
        : theme.colorScheme.error;
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 4),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Padding(
            padding: const EdgeInsets.only(top: 6),
            child: Icon(Icons.circle, size: 8, color: dotColor),
          ),
          const SizedBox(width: FaiSpace.sm),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Row(
                  children: [
                    Text(
                      client.name,
                      style: FaiTheme.mono(
                        size: 12,
                        weight: FontWeight.w600,
                        color: theme.colorScheme.onSurface,
                      ),
                    ),
                    const SizedBox(width: FaiSpace.sm),
                    if (client.toolCount > 0)
                      FaiPill(
                        label: l.mcpToolsCount(client.toolCount),
                        tone: FaiPillTone.success,
                      )
                    else if (client.errorKind.isNotEmpty)
                      FaiPill(
                        label: client.errorKind,
                        tone: FaiPillTone.danger,
                      ),
                  ],
                ),
                Text(
                  client.endpoint,
                  style: FaiTheme.mono(
                    size: 10,
                    color: theme.colorScheme.onSurfaceVariant,
                  ),
                ),
                if (client.message.isNotEmpty)
                  Text(
                    client.message,
                    style: theme.textTheme.bodySmall?.copyWith(
                      color: client.errorKind.isEmpty
                          ? theme.colorScheme.onSurfaceVariant
                          : theme.colorScheme.error,
                    ),
                  ),
              ],
            ),
          ),
          IconButton(
            icon: const Icon(Icons.delete_outline, size: 14),
            tooltip: l.mcpRemoveTooltip,
            visualDensity: VisualDensity.compact,
            onPressed: onRemove,
          ),
        ],
      ),
    );
  }
}

class _AddMcpClientDialog extends StatefulWidget {
  const _AddMcpClientDialog();

  static Future<McpClientDraft?> show(BuildContext context) {
    return showDialog<McpClientDraft>(
      context: context,
      builder: (_) => const _AddMcpClientDialog(),
    );
  }

  @override
  State<_AddMcpClientDialog> createState() => _AddMcpClientDialogState();
}

class _AddMcpClientDialogState extends State<_AddMcpClientDialog> {
  final _name = TextEditingController();
  final _endpoint = TextEditingController();
  final _apiKey = TextEditingController();
  final _desc = TextEditingController();

  /// Pick a suggestion → fill the form. Operators still hit
  /// "Add + discover" so nothing happens unprompted.
  void _applySuggestion(_McpSuggestion s) {
    setState(() {
      _name.text = s.name;
      _endpoint.text = s.endpoint;
      _apiKey.text = s.apiKeyEnv;
      _desc.text = s.description;
    });
  }

  @override
  void dispose() {
    _name.dispose();
    _endpoint.dispose();
    _apiKey.dispose();
    _desc.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final l = AppLocalizations.of(context)!;
    return AlertDialog(
      title: Text(l.addMcpTitle),
      content: ConstrainedBox(
        constraints: const BoxConstraints(maxWidth: 520),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(
              l.addMcpIntro,
              style: theme.textTheme.bodySmall?.copyWith(
                color: theme.colorScheme.onSurfaceVariant,
              ),
            ),
            const SizedBox(height: FaiSpace.md),
            // Curated suggestions from the official Anthropic
            // MCP servers + a few community staples. Click a
            // chip to pre-fill the form. The operator still
            // confirms via "Add + discover" — no unprompted
            // subprocess spawn.
            Text(
              l.addMcpSuggestionsLabel,
              style: theme.textTheme.labelSmall?.copyWith(
                color: theme.colorScheme.onSurfaceVariant,
                letterSpacing: 0.5,
              ),
            ),
            const SizedBox(height: 6),
            Wrap(
              spacing: FaiSpace.xs,
              runSpacing: FaiSpace.xs,
              children: [
                for (final s in _kMcpSuggestions)
                  ActionChip(
                    avatar: Icon(s.icon, size: 14),
                    label: Text(s.name),
                    onPressed: () => _applySuggestion(s),
                  ),
              ],
            ),
            const Divider(height: FaiSpace.xl),
            TextField(
              controller: _name,
              autofocus: true,
              decoration: InputDecoration(
                labelText: l.addMcpNameLabel,
                hintText: l.addMcpNameHint,
                border: const OutlineInputBorder(),
                isDense: true,
              ),
            ),
            const SizedBox(height: FaiSpace.sm),
            TextField(
              controller: _endpoint,
              decoration: InputDecoration(
                labelText: l.addMcpEndpointLabel,
                hintText: l.addMcpEndpointHint,
                border: const OutlineInputBorder(),
                isDense: true,
              ),
            ),
            const SizedBox(height: FaiSpace.sm),
            TextField(
              controller: _apiKey,
              decoration: InputDecoration(
                labelText: l.addMcpApiKeyLabel,
                hintText: l.addMcpApiKeyHint,
                prefixText: '\$',
                border: const OutlineInputBorder(),
                isDense: true,
              ),
            ),
            const SizedBox(height: FaiSpace.sm),
            TextField(
              controller: _desc,
              decoration: InputDecoration(
                labelText: l.addMcpNotesLabel,
                border: const OutlineInputBorder(),
                isDense: true,
              ),
            ),
          ],
        ),
      ),
      actions: [
        TextButton(
          onPressed: () => Navigator.pop(context, null),
          child: Text(l.buttonCancel),
        ),
        FilledButton(
          onPressed: () {
            if (_name.text.trim().isEmpty || _endpoint.text.trim().isEmpty) {
              return;
            }
            Navigator.pop(
              context,
              McpClientDraft(
                name: _name.text.trim(),
                endpoint: _endpoint.text.trim(),
                apiKeyEnv: _apiKey.text.trim(),
                description: _desc.text.trim(),
              ),
            );
          },
          child: Text(l.addMcpAddButton),
        ),
      ],
    );
  }
}

class N8nEndpointDraft {
  final String name;
  final String baseUrl;
  final String apiKeyEnv;
  final String description;
  const N8nEndpointDraft({
    required this.name,
    required this.baseUrl,
    required this.apiKeyEnv,
    required this.description,
  });
}

/// n8n-endpoints panel — sister of `_McpClientsPanel`. Shows
/// every configured n8n install with last-discovery health
/// (workflow count or error_kind), plus Add / Remove / Refresh.
class _N8nEndpointsPanel extends StatelessWidget {
  final List<N8nEndpointInfo> endpoints;
  final ValueChanged<N8nEndpointDraft> onAdd;
  final ValueChanged<String> onRemove;
  final VoidCallback onRefresh;

  const _N8nEndpointsPanel({
    required this.endpoints,
    required this.onAdd,
    required this.onRemove,
    required this.onRefresh,
  });

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final l = AppLocalizations.of(context)!;
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Row(
          children: [
            Text(
              l.n8nHeader,
              style: theme.textTheme.labelSmall?.copyWith(
                color: theme.colorScheme.onSurfaceVariant,
                letterSpacing: 0.6,
                fontSize: 10,
              ),
            ),
            const SizedBox(width: FaiSpace.sm),
            FaiPill(
              label: l.n8nEndpointsCount(endpoints.length),
              tone: FaiPillTone.neutral,
            ),
            const Spacer(),
            IconButton(
              icon: const Icon(Icons.refresh, size: 16),
              tooltip: l.n8nRediscoverTooltip,
              visualDensity: VisualDensity.compact,
              onPressed: onRefresh,
            ),
            IconButton(
              icon: const Icon(Icons.add, size: 16),
              tooltip: l.n8nAddTooltip,
              visualDensity: VisualDensity.compact,
              onPressed: () async {
                final draft = await _AddN8nEndpointDialog.show(context);
                if (draft != null) onAdd(draft);
              },
            ),
          ],
        ),
        const SizedBox(height: 2),
        Text(
          l.n8nHint,
          style: theme.textTheme.bodySmall?.copyWith(
            color: theme.colorScheme.onSurfaceVariant,
          ),
        ),
        const SizedBox(height: FaiSpace.sm),
        if (endpoints.isEmpty)
          Padding(
            padding: const EdgeInsets.symmetric(vertical: FaiSpace.sm),
            child: Text(
              l.n8nEmpty,
              style: theme.textTheme.bodySmall?.copyWith(
                color: theme.colorScheme.onSurfaceVariant,
              ),
            ),
          )
        else
          for (final e in endpoints)
            _N8nEndpointRow(
              endpoint: e,
              onRemove: () => onRemove(e.name),
            ),
      ],
    );
  }
}

class _N8nEndpointRow extends StatelessWidget {
  final N8nEndpointInfo endpoint;
  final VoidCallback onRemove;
  const _N8nEndpointRow({required this.endpoint, required this.onRemove});

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final l = AppLocalizations.of(context)!;
    final ok = endpoint.healthy;
    final dotColor = endpoint.errorKind.isEmpty
        ? (ok ? FaiColors.success : FaiColors.muted)
        : theme.colorScheme.error;
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 4),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Padding(
            padding: const EdgeInsets.only(top: 6),
            child: Icon(Icons.circle, size: 8, color: dotColor),
          ),
          const SizedBox(width: FaiSpace.sm),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Row(
                  children: [
                    Text(
                      endpoint.name,
                      style: FaiTheme.mono(
                        size: 12,
                        weight: FontWeight.w600,
                        color: theme.colorScheme.onSurface,
                      ),
                    ),
                    const SizedBox(width: FaiSpace.sm),
                    if (endpoint.workflowCount > 0)
                      FaiPill(
                        label: l.n8nWorkflowsCount(endpoint.workflowCount),
                        tone: FaiPillTone.success,
                      )
                    else if (endpoint.errorKind.isNotEmpty)
                      FaiPill(
                        label: endpoint.errorKind,
                        tone: FaiPillTone.danger,
                      ),
                  ],
                ),
                Text(
                  endpoint.baseUrl,
                  style: FaiTheme.mono(
                    size: 10,
                    color: theme.colorScheme.onSurfaceVariant,
                  ),
                ),
                if (endpoint.message.isNotEmpty)
                  Text(
                    endpoint.message,
                    style: theme.textTheme.bodySmall?.copyWith(
                      color: endpoint.errorKind.isEmpty
                          ? theme.colorScheme.onSurfaceVariant
                          : theme.colorScheme.error,
                    ),
                  ),
              ],
            ),
          ),
          IconButton(
            icon: const Icon(Icons.delete_outline, size: 14),
            tooltip: l.n8nRemoveTooltip,
            visualDensity: VisualDensity.compact,
            onPressed: onRemove,
          ),
        ],
      ),
    );
  }
}

class _AddN8nEndpointDialog extends StatefulWidget {
  const _AddN8nEndpointDialog();

  static Future<N8nEndpointDraft?> show(BuildContext context) {
    return showDialog<N8nEndpointDraft>(
      context: context,
      builder: (_) => const _AddN8nEndpointDialog(),
    );
  }

  @override
  State<_AddN8nEndpointDialog> createState() => _AddN8nEndpointDialogState();
}

class _AddN8nEndpointDialogState extends State<_AddN8nEndpointDialog> {
  final _name = TextEditingController();
  final _baseUrl = TextEditingController();
  final _apiKey = TextEditingController();
  final _desc = TextEditingController();

  @override
  void dispose() {
    _name.dispose();
    _baseUrl.dispose();
    _apiKey.dispose();
    _desc.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final l = AppLocalizations.of(context)!;
    return AlertDialog(
      title: Text(l.addN8nTitle),
      content: ConstrainedBox(
        constraints: const BoxConstraints(maxWidth: 480),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(
              l.addN8nIntro,
              style: theme.textTheme.bodySmall?.copyWith(
                color: theme.colorScheme.onSurfaceVariant,
              ),
            ),
            const SizedBox(height: FaiSpace.md),
            TextField(
              controller: _name,
              autofocus: true,
              decoration: InputDecoration(
                labelText: l.addN8nNameLabel,
                hintText: l.addN8nNameHint,
                border: const OutlineInputBorder(),
                isDense: true,
              ),
            ),
            const SizedBox(height: FaiSpace.sm),
            TextField(
              controller: _baseUrl,
              decoration: InputDecoration(
                labelText: l.addN8nBaseUrlLabel,
                hintText: l.addN8nBaseUrlHint,
                border: const OutlineInputBorder(),
                isDense: true,
              ),
            ),
            const SizedBox(height: FaiSpace.sm),
            TextField(
              controller: _apiKey,
              decoration: InputDecoration(
                labelText: l.addN8nApiKeyLabel,
                hintText: l.addN8nApiKeyHint,
                prefixText: '\$',
                border: const OutlineInputBorder(),
                isDense: true,
              ),
            ),
            const SizedBox(height: FaiSpace.sm),
            TextField(
              controller: _desc,
              decoration: InputDecoration(
                labelText: l.addN8nNotesLabel,
                border: const OutlineInputBorder(),
                isDense: true,
              ),
            ),
          ],
        ),
      ),
      actions: [
        TextButton(
          onPressed: () => Navigator.pop(context, null),
          child: Text(l.buttonCancel),
        ),
        FilledButton(
          onPressed: () {
            if (_name.text.trim().isEmpty || _baseUrl.text.trim().isEmpty) return;
            Navigator.pop(
              context,
              N8nEndpointDraft(
                name: _name.text.trim(),
                baseUrl: _baseUrl.text.trim(),
                apiKeyEnv: _apiKey.text.trim(),
                description: _desc.text.trim(),
              ),
            );
          },
          child: Text(l.addN8nAddButton),
        ),
      ],
    );
  }
}

/// One curated MCP-server suggestion — the operator clicks
/// the chip to pre-fill the add-dialog. Strictly informational
/// metadata; nothing is auto-spawned. Trust model:
/// referencing public projects with their canonical install
/// command is the same legal / security shape as a package
/// manager listing a third-party repo.
///
/// All entries point at official Anthropic MCP servers from
/// `github.com/modelcontextprotocol/servers` plus a few
/// community-curated standards. Refresh the list when the
/// upstream README changes.
class _McpSuggestion {
  final String name;
  final IconData icon;
  final String endpoint;
  final String apiKeyEnv;
  final String description;
  const _McpSuggestion({
    required this.name,
    required this.icon,
    required this.endpoint,
    required this.apiKeyEnv,
    required this.description,
  });
}

const _kMcpSuggestions = <_McpSuggestion>[
  _McpSuggestion(
    name: 'filesystem',
    icon: Icons.folder_outlined,
    endpoint: 'stdio://npx -y @modelcontextprotocol/server-filesystem /tmp',
    apiKeyEnv: '',
    description:
        'Anthropic — read/write files in /tmp. Edit the path before saving.',
  ),
  _McpSuggestion(
    name: 'fetch',
    icon: Icons.cloud_download_outlined,
    endpoint: 'stdio://npx -y @modelcontextprotocol/server-fetch',
    apiKeyEnv: '',
    description: 'Anthropic — fetch arbitrary HTTP(S) URLs as markdown.',
  ),
  _McpSuggestion(
    name: 'github',
    icon: Icons.code,
    endpoint: 'stdio://npx -y @modelcontextprotocol/server-github',
    apiKeyEnv: 'GITHUB_PERSONAL_ACCESS_TOKEN',
    description:
        'Anthropic — issues, PRs, repo files. Needs a GitHub PAT in the env var.',
  ),
  _McpSuggestion(
    name: 'puppeteer',
    icon: Icons.web,
    endpoint: 'stdio://npx -y @modelcontextprotocol/server-puppeteer',
    apiKeyEnv: '',
    description: 'Anthropic — headless browser automation for screenshots / scraping.',
  ),
  _McpSuggestion(
    name: 'postgres',
    icon: Icons.storage_outlined,
    endpoint:
        'stdio://npx -y @modelcontextprotocol/server-postgres postgresql://user:pw@host/db',
    apiKeyEnv: '',
    description:
        'Anthropic — read-only SQL queries against a Postgres database. Edit the URL.',
  ),
  _McpSuggestion(
    name: 'sqlite',
    icon: Icons.dataset_outlined,
    endpoint:
        'stdio://npx -y @modelcontextprotocol/server-sqlite --db-path /tmp/db.sqlite',
    apiKeyEnv: '',
    description: 'Anthropic — query a local SQLite file. Edit the path.',
  ),
  _McpSuggestion(
    name: 'brave-search',
    icon: Icons.search,
    endpoint: 'stdio://npx -y @modelcontextprotocol/server-brave-search',
    apiKeyEnv: 'BRAVE_API_KEY',
    description: 'Anthropic — web search via Brave. API key required.',
  ),
  _McpSuggestion(
    name: 'memory',
    icon: Icons.psychology_outlined,
    endpoint: 'stdio://npx -y @modelcontextprotocol/server-memory',
    apiKeyEnv: '',
    description: 'Anthropic — persistent knowledge graph for an agent\'s memory.',
  ),
  _McpSuggestion(
    name: 'time',
    icon: Icons.schedule,
    endpoint: 'stdio://npx -y @modelcontextprotocol/server-time',
    apiKeyEnv: '',
    description: 'Anthropic — current time + timezone conversion.',
  ),
];