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

import '../core/api_service.dart';
import '../models/automation_rule.dart';

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

  @override
  State<AutomationRulesTab> createState() => _AutomationRulesTabState();
}

class _AutomationRulesTabState extends State<AutomationRulesTab> {
  late Future<List<AutomationRule>> _future;

  @override
  void initState() {
    super.initState();
    _future = _load();
  }

  Future<List<AutomationRule>> _load() => context.read<ApiService>().automationRules();

  Future<void> _refresh() async {
    final future = _load();
    setState(() => _future = future);
    await future;
  }

  @override
  Widget build(BuildContext context) {
    return RefreshIndicator(
      onRefresh: _refresh,
      child: FutureBuilder<List<AutomationRule>>(
        future: _future,
        builder: (context, snapshot) {
          if (snapshot.connectionState != ConnectionState.done) {
            return const Center(child: CircularProgressIndicator());
          }
          if (snapshot.hasError) {
            return ListView(
              physics: const AlwaysScrollableScrollPhysics(),
              children: [
                Padding(
                  padding: const EdgeInsets.all(24),
                  child: Text('${snapshot.error}', textAlign: TextAlign.center),
                ),
              ],
            );
          }

          final rules = snapshot.data!;
          if (rules.isEmpty) {
            return ListView(
              physics: const AlwaysScrollableScrollPhysics(),
              children: const [
                Padding(
                  padding: EdgeInsets.all(24),
                  child: Text('Правил пока нет.', textAlign: TextAlign.center),
                ),
              ],
            );
          }

          return ListView.separated(
            physics: const AlwaysScrollableScrollPhysics(),
            itemCount: rules.length,
            separatorBuilder: (context, index) => const Divider(height: 1),
            itemBuilder: (context, index) {
              final rule = rules[index];
              final condition =
                  '${rule.conditionSourceDevice?.name ?? '?'}: ${rule.conditionSensorType} ${rule.conditionOperator} ${rule.conditionValue}';
              final action = rule.level != null
                  ? '${rule.actionType} (${rule.level}) → ${rule.targetDevice?.name ?? '?'}'
                  : '${rule.actionType} → ${rule.targetDevice?.name ?? '?'}';

              return ListTile(
                leading: Icon(rule.isActive ? Icons.bolt : Icons.bolt_outlined),
                title: Text('ЕСЛИ $condition'),
                subtitle: Text('ТО $action'),
                isThreeLine: true,
              );
            },
          );
        },
      ),
    );
  }
}