import 'package:flutter/material.dart' hide Stack;
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';
import 'package:tatlock_ui/features/control_room/containers/presentation/pages/containers_list_page.dart';
import 'package:tatlock_ui/features/control_room/npm/presentation/pages/proxy_hosts_page.dart';
import 'package:tatlock_ui/features/control_room/router.dart';
import 'package:tatlock_ui/features/control_room/stacks/data/repositories/stack_repository_impl.dart';
import 'package:tatlock_ui/features/control_room/stacks/domain/entities/stack.dart';
import 'package:tatlock_ui/features/control_room/stacks/presentation/pages/stack_detail_page.dart';
import 'package:tatlock_ui/features/control_room/stacks/presentation/providers/stacks_provider.dart';
import 'package:tatlock_ui/features/control_room/stacks/presentation/widgets/stack_list_tile.dart';
import 'package:tatlock_ui/shared/layouts/widgets/filter_panel.dart';
import 'package:tatlock_ui/shared/layouts/widgets/nav_panel.dart';

/// Main Control Room page with nav panel and section content.
class ControlRoomPage extends ConsumerWidget {
  const ControlRoomPage({
    super.key,
    this.nav = ControlRoomNav.containers,
  });

  /// The current nav item to display.
  final ControlRoomNav nav;

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final colorScheme = Theme.of(context).colorScheme;

    return Scaffold(
      body: Row(
        children: [
          // Nav Panel - section navigation with grouping
          NavPanel(
            title: 'Sections',
            icon: Icons.dns_outlined,
            items: ControlRoomNav.values.map((n) => n.toNavItem()).toList(),
            selectedId: nav.id,
            onItemSelected: (id) {
              final newNav = ControlRoomNav.values.firstWhere(
                (n) => n.id == id,
              );
              // Navigate to section URL
              context.go(pathForNav(newNav));
              // Clear stack selection when changing sections
              ref.read(selectedStackProvider.notifier).clear();
            },
          ),
          // Divider
          VerticalDivider(
            width: 1,
            thickness: 1,
            color: colorScheme.outlineVariant,
          ),
          // Section content
          Expanded(
            child: _SectionContent(nav: nav),
          ),
        ],
      ),
    );
  }
}

/// Renders content for the selected nav item.
class _SectionContent extends ConsumerWidget {
  const _SectionContent({required this.nav});

  final ControlRoomNav nav;

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    return switch (nav) {
      ControlRoomNav.containers => const _ContainersSection(),
      ControlRoomNav.proxyHosts => const ProxyHostsPage(),
      _ => _PlaceholderSection(nav: nav),
    };
  }
}

/// Placeholder for nav items not yet implemented.
class _PlaceholderSection extends StatelessWidget {
  const _PlaceholderSection({required this.nav});

  final ControlRoomNav nav;

  @override
  Widget build(BuildContext context) {
    final colorScheme = Theme.of(context).colorScheme;
    final textTheme = Theme.of(context).textTheme;

    return Center(
      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: [
          Icon(
            nav.icon,
            size: 64,
            color: colorScheme.outline,
          ),
          const SizedBox(height: 16),
          Text(
            nav.label,
            style: textTheme.headlineSmall?.copyWith(
              color: colorScheme.onSurfaceVariant,
            ),
          ),
          const SizedBox(height: 8),
          Text(
            '${nav.section} • Coming soon',
            style: textTheme.bodyMedium?.copyWith(
              color: colorScheme.outline,
            ),
          ),
        ],
      ),
    );
  }
}

/// Containers section with optional stack filter.
class _ContainersSection extends ConsumerWidget {
  const _ContainersSection();

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final selectedStack = ref.watch(selectedStackProvider);
    final colorScheme = Theme.of(context).colorScheme;

    return Row(
      children: [
        // Stacks filter panel
        const _StacksFilterPanel(),
        // Divider
        VerticalDivider(
          width: 1,
          thickness: 1,
          color: colorScheme.outlineVariant,
        ),
        // Main content - containers list or stack detail
        Expanded(
          child: selectedStack == null
              ? const ContainersListPage()
              : StackDetailPage(stackId: selectedStack),
        ),
      ],
    );
  }
}

/// Stacks filter panel for Containers section (includes "All Containers" option).
class _StacksFilterPanel extends ConsumerWidget {
  const _StacksFilterPanel();

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final stacksAsync = ref.watch(stacksProvider);
    final selectedStack = ref.watch(selectedStackProvider);
    final colorScheme = Theme.of(context).colorScheme;

    return FilterPanel(
      title: 'Stacks',
      icon: Icons.layers,
      onRefresh: () => ref.invalidate(stacksProvider),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.stretch,
        children: [
          // All containers option
          ListTile(
            selected: selectedStack == null,
            selectedTileColor:
                colorScheme.primaryContainer.withValues(alpha: 0.3),
            leading: Icon(
              Icons.all_inbox,
              color: selectedStack == null
                  ? colorScheme.primary
                  : colorScheme.onSurfaceVariant,
            ),
            title: const Text('All Containers'),
            onTap: () => ref.read(selectedStackProvider.notifier).clear(),
          ),
          const Divider(height: 1),
          // Stacks list
          Expanded(
            child: stacksAsync.when(
              loading: () => const Center(
                child: CircularProgressIndicator(),
              ),
              error: (error, _) => Center(
                child: Padding(
                  padding: const EdgeInsets.all(16),
                  child: Column(
                    mainAxisSize: MainAxisSize.min,
                    children: [
                      Icon(
                        Icons.error_outline,
                        color: colorScheme.error,
                      ),
                      const SizedBox(height: 8),
                      Text(
                        'Failed to load stacks',
                        style: TextStyle(color: colorScheme.error),
                      ),
                    ],
                  ),
                ),
              ),
              data: (stacks) => _StacksList(
                stacks: stacks,
                selectedStackId: selectedStack,
                onStackSelected: (id) =>
                    ref.read(selectedStackProvider.notifier).select(id),
                onStackAction: (id, action) =>
                    _handleStackAction(context, ref, id, action),
              ),
            ),
          ),
        ],
      ),
    );
  }

  Future<void> _handleStackAction(
    BuildContext context,
    WidgetRef ref,
    String stackId,
    String action,
  ) async {
    final repository = ref.read(stackRepositoryProvider);
    final messenger = ScaffoldMessenger.of(context);
    final colorScheme = Theme.of(context).colorScheme;

    try {
      switch (action) {
        case 'start':
          await repository.startStack(stackId);
        case 'stop':
          await repository.stopStack(stackId);
        case 'restart':
          await repository.restartStack(stackId);
      }

      // Refresh data
      ref.invalidate(stacksProvider);

      // Show success snackbar
      messenger.showSnackBar(
        SnackBar(
          content: Text('Stack ${action}ed successfully'),
          backgroundColor: colorScheme.primaryContainer,
          behavior: SnackBarBehavior.floating,
          duration: const Duration(seconds: 2),
        ),
      );
    } catch (e) {
      messenger.showSnackBar(
        SnackBar(
          content: Row(
            children: [
              Icon(Icons.error_outline, color: colorScheme.onErrorContainer),
              const SizedBox(width: 8),
              Expanded(
                child: Text(
                  'Failed to $action stack: ${e.toString()}',
                  style: TextStyle(color: colorScheme.onErrorContainer),
                ),
              ),
            ],
          ),
          backgroundColor: colorScheme.errorContainer,
          behavior: SnackBarBehavior.floating,
          duration: const Duration(seconds: 4),
        ),
      );
    }
  }
}

class _StacksList extends StatefulWidget {
  const _StacksList({
    required this.stacks,
    required this.selectedStackId,
    required this.onStackSelected,
    required this.onStackAction,
  });

  final List<Stack> stacks;
  final String? selectedStackId;
  final void Function(String) onStackSelected;
  final void Function(String, String) onStackAction;

  @override
  State<_StacksList> createState() => _StacksListState();
}

class _StacksListState extends State<_StacksList> {
  final _searchController = TextEditingController();
  String _searchQuery = '';

  @override
  void dispose() {
    _searchController.dispose();
    super.dispose();
  }

  List<Stack> get _filteredStacks {
    if (_searchQuery.isEmpty) return widget.stacks;
    final query = _searchQuery.toLowerCase();
    return widget.stacks.where((s) {
      return s.name.toLowerCase().contains(query);
    }).toList();
  }

  @override
  Widget build(BuildContext context) {
    final colorScheme = Theme.of(context).colorScheme;
    final filtered = _filteredStacks;

    return Column(
      children: [
        // Search field
        Padding(
          padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
          child: TextField(
            controller: _searchController,
            decoration: InputDecoration(
              hintText: 'Search stacks...',
              prefixIcon: const Icon(Icons.search, size: 18),
              suffixIcon: _searchQuery.isNotEmpty
                  ? IconButton(
                      icon: const Icon(Icons.clear, size: 16),
                      onPressed: () {
                        _searchController.clear();
                        setState(() => _searchQuery = '');
                      },
                    )
                  : null,
              isDense: true,
              contentPadding: const EdgeInsets.symmetric(
                horizontal: 12,
                vertical: 8,
              ),
              border: OutlineInputBorder(
                borderRadius: BorderRadius.circular(8),
              ),
            ),
            style: const TextStyle(fontSize: 13),
            onChanged: (value) => setState(() => _searchQuery = value),
          ),
        ),
        // Stack list or empty state
        Expanded(
          child: filtered.isEmpty
              ? Center(
                  child: Padding(
                    padding: const EdgeInsets.all(16),
                    child: Column(
                      mainAxisSize: MainAxisSize.min,
                      children: [
                        Icon(
                          _searchQuery.isEmpty
                              ? Icons.layers_clear
                              : Icons.search_off,
                          size: 32,
                          color: colorScheme.outline,
                        ),
                        const SizedBox(height: 8),
                        Text(
                          _searchQuery.isEmpty
                              ? 'No stacks found'
                              : 'No stacks match "$_searchQuery"',
                          style: TextStyle(
                            color: colorScheme.outline,
                            fontSize: 13,
                          ),
                          textAlign: TextAlign.center,
                        ),
                      ],
                    ),
                  ),
                )
              : ListView.builder(
                  itemCount: filtered.length,
                  itemBuilder: (context, index) {
                    final stack = filtered[index];
                    return StackListTile(
                      stack: stack,
                      isSelected: stack.id == widget.selectedStackId,
                      onTap: () => widget.onStackSelected(stack.id),
                      onStart: () => widget.onStackAction(stack.id, 'start'),
                      onStop: () => widget.onStackAction(stack.id, 'stop'),
                      onRestart: () => widget.onStackAction(stack.id, 'restart'),
                    );
                  },
                ),
        ),
      ],
    );
  }
}