WMC-Project-5/frontend_splatournament_manager/lib/pages/create_tournament_page.dart

import 'package:flutter/material.dart';
import 'package:frontend_splatournament_manager/providers/tournament_provider.dart';
import 'package:provider/provider.dart';
import 'package:intl/intl.dart';

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

  @override
  State<CreateTournamentPage> createState() => _CreateTournamentPageState();
}

class _CreateTournamentPageState extends State<CreateTournamentPage> {
  final _formKey = GlobalKey<FormState>();
  final _nameController = TextEditingController();
  final _descriptionController = TextEditingController();
  final _maxTeamAmountController = TextEditingController();

  DateTime? _startDate;
  DateTime? _endDate;

  bool _isLoading = false;

  final DateFormat _dateFormat = DateFormat('yyyy-MM-dd');

  Future<void> _selectDate(BuildContext context, bool isStart) async {
    final initialDate = DateTime.now();
    final picked = await showDatePicker(
      context: context,
      initialDate: initialDate,
      firstDate: initialDate,
      lastDate: DateTime(2101),
    );
    if (picked != null) {
      setState(() {
        if (isStart) {
          _startDate = picked;
        } else {
          _endDate = picked;
        }
      });
    }
  }

  void _submitForm() async {
    if (!_formKey.currentState!.validate()) return;
    if (_startDate == null || _endDate == null) {
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text('Please select both start and end dates.')),
      );
      return;
    }

    if (_endDate!.isBefore(_startDate!)) {
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text('End date cannot be before start date.')),
      );
      return;
    }

    setState(() => _isLoading = true);

    try {
      final provider = Provider.of<TournamentProvider>(context, listen: false);
      await provider.createTournament(
        _nameController.text,
        _descriptionController.text,
        int.parse(_maxTeamAmountController.text),
        _startDate!,
        _endDate!,
      );
      if (!context.mounted) return;
      Navigator.pop(context);
    } catch (e) {
      if (!context.mounted) return;
      ScaffoldMessenger.of(
        context,
      ).showSnackBar(SnackBar(content: Text('Error: $e')));
    } finally {
      if (context.mounted) setState(() => _isLoading = false);
    }
  }

  @override
  void dispose() {
    _nameController.dispose();
    _descriptionController.dispose();
    _maxTeamAmountController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Create Tournament')),
      body: SingleChildScrollView(
        padding: const EdgeInsets.all(16.0),
        child: Form(
          key: _formKey,
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: [
              TextFormField(
                controller: _nameController,
                decoration: const InputDecoration(labelText: 'Name'),
                validator: (value) =>
                    value == null || value.isEmpty ? 'Required' : null,
              ),
              const SizedBox(height: 16),
              TextFormField(
                controller: _descriptionController,
                decoration: const InputDecoration(labelText: 'Description'),
                maxLines: 3,
                validator: (value) =>
                    value == null || value.isEmpty ? 'Required' : null,
              ),
              const SizedBox(height: 16),
              TextFormField(
                controller: _maxTeamAmountController,
                decoration: const InputDecoration(labelText: 'Max Teams'),
                keyboardType: TextInputType.number,
                validator: (value) {
                  if (value == null || value.isEmpty) return 'Required';
                  if (int.tryParse(value) == null || int.parse(value) <= 0) {
                    return 'Must be a positive integer';
                  }
                  return null;
                },
              ),
              const SizedBox(height: 24),
              Row(
                children: [
                  Expanded(
                    child: OutlinedButton(
                      onPressed: () => _selectDate(context, true),
                      child: Text(
                        _startDate == null
                            ? 'Select Start Date'
                            : 'Start: ${_dateFormat.format(_startDate!)}',
                      ),
                    ),
                  ),
                  const SizedBox(width: 16),
                  Expanded(
                    child: OutlinedButton(
                      onPressed: () => _selectDate(context, false),
                      child: Text(
                        _endDate == null
                            ? 'Select End Date'
                            : 'End: ${_dateFormat.format(_endDate!)}',
                      ),
                    ),
                  ),
                ],
              ),
              const SizedBox(height: 32),
              ElevatedButton(
                onPressed: _isLoading ? null : _submitForm,
                child: _isLoading
                    ? const CircularProgressIndicator()
                    : const Text('Create Tournament'),
              ),
            ],
          ),
        ),
      ),
    );
  }
}