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

import '../models/models.dart';
import '../services/auth_controller.dart';
import '../ui/feedback.dart';

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

  @override
  State<EventFormScreen> createState() => _EventFormScreenState();
}

class _EventFormScreenState extends State<EventFormScreen> {
  final _title = TextEditingController();
  final _description = TextEditingController();
  final _expense = TextEditingController();
  final _urls = TextEditingController();
  String _planType = 'general';
  int _month = DateTime.now().month;
  int _year = DateTime.now().year;
  String? _dealerId;
  List<Dealer> _dealers = [];
  bool _loading = true;
  bool _saving = false;

  @override
  void initState() {
    super.initState();
    _prepare();
  }

  Future<void> _prepare() async {
    final user = context.read<AuthController>().user;
    if (user?.role == 'dealer') {
      setState(() {
        _dealerId = user?.dealerId;
        _loading = false;
      });
      return;
    }
    try {
      final dealers = await context.read<AuthController>().api.dealers();
      if (!mounted) return;
      setState(() {
        _dealers = dealers;
        if (dealers.length == 1) _dealerId = dealers.first.id;
        _loading = false;
      });
    } catch (error) {
      if (!mounted) return;
      setState(() => _loading = false);
      showError(context, error);
    }
  }

  @override
  void dispose() {
    _title.dispose();
    _description.dispose();
    _expense.dispose();
    _urls.dispose();
    super.dispose();
  }

  Future<void> _save() async {
    final expense = double.tryParse(_expense.text.trim());
    if (_dealerId == null || expense == null) {
      showError(context, 'Dealer and a numeric expense are required');
      return;
    }
    final urls = _urls.text
        .split('\n')
        .map((line) => line.trim())
        .where((line) => line.isNotEmpty)
        .toList();
    setState(() => _saving = true);
    try {
      await context.read<AuthController>().api.createEvent({
        'dealerId': _dealerId,
        'planType': _planType,
        'title': _title.text.trim(),
        'description': _description.text.trim(),
        'expense': expense,
        'imageUrls': urls,
        if (_planType == 'monthlySpecial') 'month': _month,
        if (_planType == 'monthlySpecial') 'year': _year,
      });
      if (mounted) Navigator.pop(context, true);
    } catch (error) {
      if (mounted) showError(context, error);
    } finally {
      if (mounted) setState(() => _saving = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    if (_loading) {
      return const Scaffold(body: Center(child: CircularProgressIndicator()));
    }
    final isDealer = context.watch<AuthController>().user?.role == 'dealer';
    return Scaffold(
      appBar: AppBar(title: const Text('New plan')),
      body: ListView(
        padding: const EdgeInsets.all(16),
        children: [
          SegmentedButton<String>(
            segments: const [
              ButtonSegment(value: 'general', label: Text('General')),
              ButtonSegment(value: 'monthlySpecial', label: Text('Monthly')),
            ],
            selected: {_planType},
            onSelectionChanged: (value) => setState(() => _planType = value.first),
          ),
          const SizedBox(height: 12),
          TextField(controller: _title, decoration: const InputDecoration(labelText: 'Title')),
          const SizedBox(height: 12),
          TextField(
            controller: _description,
            minLines: 3,
            maxLines: 5,
            decoration: const InputDecoration(labelText: 'Description'),
          ),
          const SizedBox(height: 12),
          TextField(
            controller: _expense,
            keyboardType: TextInputType.number,
            decoration: const InputDecoration(labelText: 'Expense'),
          ),
          const SizedBox(height: 12),
          TextField(
            controller: _urls,
            minLines: 2,
            maxLines: 4,
            decoration: const InputDecoration(
              labelText: 'Image URLs',
              hintText: 'One URL per line',
            ),
          ),
          if (!isDealer) ...[
            const SizedBox(height: 12),
            DropdownButtonFormField<String>(
              initialValue: _dealerId,
              decoration: const InputDecoration(labelText: 'Dealer'),
              items: [
                for (final dealer in _dealers)
                  DropdownMenuItem(value: dealer.id, child: Text('${dealer.name} (${dealer.code})')),
              ],
              onChanged: (value) => setState(() => _dealerId = value),
            ),
          ],
          if (_planType == 'monthlySpecial') ...[
            const SizedBox(height: 12),
            DropdownButtonFormField<int>(
              initialValue: _month,
              decoration: const InputDecoration(labelText: 'Month'),
              items: [
                for (var month = 1; month <= 12; month++)
                  DropdownMenuItem(value: month, child: Text('$month')),
              ],
              onChanged: (value) {
                if (value != null) setState(() => _month = value);
              },
            ),
            const SizedBox(height: 12),
            DropdownButtonFormField<int>(
              initialValue: _year,
              decoration: const InputDecoration(labelText: 'Year'),
              items: [
                for (var year = DateTime.now().year - 1; year <= DateTime.now().year + 2; year++)
                  DropdownMenuItem(value: year, child: Text('$year')),
              ],
              onChanged: (value) {
                if (value != null) setState(() => _year = value);
              },
            ),
          ],
          const SizedBox(height: 16),
          FilledButton(
            onPressed: _saving ? null : _save,
            child: Text(_saving ? 'Saving' : 'Save plan'),
          ),
        ],
      ),
    );
  }
}