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

import '../models/project.dart';
import '../providers/providers.dart';

/// Bottom sheet for starting a new session: search your PAI projects (like PAI
/// search), or open the home directory / any arbitrary directory.
///
/// The list comes from [projectsProvider], which the chat screen populates by
/// sending the `projects` command when this sheet opens.
class NewSessionSheet extends ConsumerStatefulWidget {
  /// Open a project. rehome=false → new session; rehome=true → re-home the
  /// current tab to this project's directory.
  final void Function(Project project, bool rehome) onLaunchProject;

  /// Open an arbitrary directory ("~" for home). rehome as above.
  final void Function(String path, String name, bool rehome) onLaunchPath;

  const NewSessionSheet({
    super.key,
    required this.onLaunchProject,
    required this.onLaunchPath,
  });

  @override
  ConsumerState<NewSessionSheet> createState() => _NewSessionSheetState();
}

class _NewSessionSheetState extends ConsumerState<NewSessionSheet> {
  final _searchController = TextEditingController();
  String _query = '';
  bool _rehome = false; // false = new session, true = re-home the current tab

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

  List<Project> _filtered(List<Project> projects) {
    final list = [...projects]
      ..sort(
        (a, b) => b.lastActive.compareTo(a.lastActive),
      ); // most recent first
    final q = _query.trim().toLowerCase();
    if (q.isEmpty) return list;
    return list
        .where(
          (p) =>
              p.name.toLowerCase().contains(q) ||
              p.slug.toLowerCase().contains(q) ||
              p.path.toLowerCase().contains(q),
        )
        .toList();
  }

  void _launchProject(Project p) {
    Navigator.of(context).pop();
    widget.onLaunchProject(p, _rehome);
  }

  void _launchPath(String path, String name) {
    Navigator.of(context).pop();
    widget.onLaunchPath(path, name, _rehome);
  }

  Future<void> _promptCustomDir() async {
    final controller = TextEditingController();
    final dir = await showDialog<String>(
      context: context,
      builder: (ctx) => AlertDialog(
        title: const Text('Open a directory'),
        content: TextField(
          controller: controller,
          autofocus: true,
          decoration: const InputDecoration(
            hintText: '/Users/you/dev/apps/youdrill',
          ),
          onSubmitted: (v) => Navigator.pop(ctx, v),
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(ctx),
            child: const Text('Cancel'),
          ),
          TextButton(
            onPressed: () => Navigator.pop(ctx, controller.text),
            child: const Text('Open'),
          ),
        ],
      ),
    );
    controller.dispose();
    final path = dir?.trim() ?? '';
    if (path.isEmpty) return;
    final parts = path.split('/').where((s) => s.isNotEmpty).toList();
    _launchPath(path, parts.isNotEmpty ? parts.last : 'Session');
  }

  @override
  Widget build(BuildContext context) {
    final projects = ref.watch(projectsProvider);
    final filtered = _filtered(projects);

    return Padding(
      padding: EdgeInsets.only(
        bottom: MediaQuery.of(context).viewInsets.bottom,
      ),
      child: DraggableScrollableSheet(
        expand: false,
        initialChildSize: 0.7,
        minChildSize: 0.4,
        maxChildSize: 0.92,
        builder: (context, scrollController) {
          return Column(
            children: [
              // Grabber
              Container(
                width: 40,
                height: 4,
                margin: const EdgeInsets.symmetric(vertical: 10),
                decoration: BoxDecoration(
                  color: Colors.grey.withAlpha(120),
                  borderRadius: BorderRadius.circular(2),
                ),
              ),
              Padding(
                padding: const EdgeInsets.fromLTRB(16, 0, 16, 8),
                child: SegmentedButton<bool>(
                  segments: const [
                    ButtonSegment(
                      value: false,
                      label: Text('New session'),
                      icon: Icon(Icons.add, size: 18),
                    ),
                    ButtonSegment(
                      value: true,
                      label: Text('Switch this tab'),
                      icon: Icon(Icons.swap_horiz, size: 18),
                    ),
                  ],
                  selected: {_rehome},
                  showSelectedIcon: false,
                  onSelectionChanged: (s) => setState(() => _rehome = s.first),
                ),
              ),
              Padding(
                padding: const EdgeInsets.fromLTRB(16, 0, 16, 8),
                child: TextField(
                  controller: _searchController,
                  autofocus: true,
                  textInputAction: TextInputAction.search,
                  decoration: InputDecoration(
                    hintText: 'Search projects…',
                    prefixIcon: const Icon(Icons.search),
                    border: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(12),
                    ),
                    isDense: true,
                  ),
                  onChanged: (v) => setState(() => _query = v),
                ),
              ),
              Expanded(
                child: ListView(
                  controller: scrollController,
                  children: [
                    ListTile(
                      leading: const Icon(Icons.home_outlined),
                      title: const Text('Home directory'),
                      subtitle: const Text('New session in ~'),
                      onTap: () => _launchPath('~', 'Home'),
                    ),
                    ListTile(
                      leading: const Icon(Icons.folder_open_outlined),
                      title: const Text('Open a directory…'),
                      subtitle: const Text('Start in any path'),
                      onTap: _promptCustomDir,
                    ),
                    const Divider(height: 1),
                    if (projects.isEmpty)
                      const Padding(
                        padding: EdgeInsets.all(24),
                        child: Center(child: Text('Loading projects…')),
                      )
                    else if (filtered.isEmpty)
                      const Padding(
                        padding: EdgeInsets.all(24),
                        child: Center(child: Text('No matching projects')),
                      )
                    else
                      ...filtered.map(
                        (p) => ListTile(
                          leading: const Icon(Icons.folder_special_outlined),
                          title: Text(p.name),
                          subtitle: Text(
                            p.path,
                            maxLines: 1,
                            overflow: TextOverflow.ellipsis,
                          ),
                          trailing: p.sessions > 0
                              ? Text(
                                  '${p.sessions}',
                                  style: TextStyle(
                                    color: Colors.grey.withAlpha(180),
                                    fontSize: 13,
                                  ),
                                )
                              : null,
                          onTap: () => _launchProject(p),
                        ),
                      ),
                  ],
                ),
              ),
            ],
          );
        },
      ),
    );
  }
}