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

import '../../models/programmer_project.model.dart';
import '../../models/programmer_task.model.dart';
import '../../providers/programmer_projects_provider.dart';
import '../../providers/programmer_tasks_provider.dart';
import '../../theme/app_status_colors.dart';
import '../../widgets/app_section_header.dart';
import '../../widgets/m3_card.dart';
import '../../widgets/responsive_body.dart';
import '../../widgets/status_pill.dart';
import '../programmer_tasks/programmer_task_create.dart';
import '../programmer_tasks/programmer_task_status_kind.dart';

class ProgrammerProjectDetailScreen extends ConsumerWidget {
  const ProgrammerProjectDetailScreen({super.key, required this.projectId});

  final String projectId;

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final project = ref.watch(programmerProjectByIdProvider(projectId));
    final tasks = (ref.watch(programmerTasksProvider).valueOrNull ?? const [])
        .where((t) => t.projectId == projectId)
        .toList();

    return Scaffold(
      appBar: AppBar(
        title: Text(project?.name ?? 'Project'),
        actions: [
          if (project != null)
            IconButton(
              tooltip: project.isArchived ? 'Unarchive' : 'Archive',
              icon: Icon(project.isArchived
                  ? Icons.unarchive_outlined
                  : Icons.archive_outlined),
              onPressed: () async {
                final messenger = ScaffoldMessenger.of(context);
                await ref.read(programmerProjectsControllerProvider).setArchived(
                      projectId: projectId,
                      archived: !project.isArchived,
                    );
                messenger.showSnackBar(SnackBar(
                  content: Text(
                      project.isArchived ? 'Project unarchived' : 'Project archived'),
                ));
              },
            ),
        ],
      ),
      floatingActionButton: project == null
          ? null
          : FloatingActionButton.extended(
              heroTag: 'project_new_task',
              onPressed: () => showCreateProgrammerTaskDialog(
                context,
                ref,
                initialProjectId: projectId,
              ),
              icon: const Icon(Icons.add),
              label: const Text('New Task'),
            ),
      body: project == null
          ? const Center(child: CircularProgressIndicator())
          : ResponsiveBody(
              child: ListView(
                padding: const EdgeInsets.symmetric(vertical: 16),
                children: [
                  M3Card.elevated(
                    child: Padding(
                      padding: const EdgeInsets.all(16),
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          Row(
                            children: [
                              Expanded(
                                child: Text(project.name,
                                    style: Theme.of(context)
                                        .textTheme
                                        .titleLarge
                                        ?.copyWith(fontWeight: FontWeight.w700)),
                              ),
                              StatusPill.kind(
                                project.isArchived
                                    ? StatusKind.neutral
                                    : StatusKind.success,
                                label: ProgrammerProjectStatus.label(
                                    project.status),
                              ),
                            ],
                          ),
                          if (project.description != null &&
                              project.description!.trim().isNotEmpty) ...[
                            const SizedBox(height: 12),
                            Text(project.description!,
                                style: Theme.of(context).textTheme.bodyMedium),
                          ],
                        ],
                      ),
                    ),
                  ),
                  const SizedBox(height: 24),
                  AppSectionHeader('Tasks (${tasks.length})'),
                  if (tasks.isEmpty)
                    Text('No tasks in this project yet.',
                        style: Theme.of(context).textTheme.bodySmall?.copyWith(
                            color:
                                Theme.of(context).colorScheme.onSurfaceVariant))
                  else
                    for (final t in tasks) _ProjectTaskTile(task: t),
                  const SizedBox(height: 80),
                ],
              ),
            ),
    );
  }
}

class _ProjectTaskTile extends StatelessWidget {
  const _ProjectTaskTile({required this.task});

  final ProgrammerTask task;

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 5),
      child: M3Card.outlined(
        onTap: () => context.go('/programmer-tasks/${task.id}'),
        child: Padding(
          padding: const EdgeInsets.all(12),
          child: Row(
            children: [
              Expanded(
                child: Text(task.title,
                    style: Theme.of(context).textTheme.bodyLarge,
                    maxLines: 1,
                    overflow: TextOverflow.ellipsis),
              ),
              const SizedBox(width: 8),
              StatusPill.kind(
                programmerTaskStatusKind(task.status),
                label: ProgrammerTaskStatus.label(task.status),
              ),
            ],
          ),
        ),
      ),
    );
  }
}