import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import '../models/todo.dart';
import '../providers/todo_provider.dart';

class ToDoForm extends StatefulWidget {
  @override
  _ToDoFormState createState() => _ToDoFormState();
}

class _ToDoFormState extends State<ToDoForm> {
  final _titleController = TextEditingController();
  final _descriptionController = TextEditingController();
  DateTime? _selectedDate;
  String _selectedPriority = 'Low';

  bool get _isFormValid => _titleController.text.isNotEmpty && _selectedDate != null;

  void _submitForm() {
    if (!_isFormValid) return;

    var newTodo = ToDo(
      title: _titleController.text,
      description: _descriptionController.text.trim().isEmpty ? '' : _descriptionController.text,
      deadline: _selectedDate!,
      priority: _selectedPriority,
    );

    Provider.of<ToDoProvider>(context, listen: false).addTask(newTodo);
    Navigator.of(context).pop();
  }

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.all(16.0),
      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: [
          // Title input
          TextField(
            controller: _titleController,
            decoration: InputDecoration(
              labelText: 'Title *',
              hintText: 'Enter task title',
            ),
            onChanged: (_) {
              setState(() {});
            },
          ),
          TextField(
            controller: _descriptionController,
            decoration: InputDecoration(
              labelText: 'Description',
              hintText: 'Enter task description (optional)',
            ),
          ),
          // Deadline picker
          Row(
            children: [
              TextButton(
                onPressed: () async {
                  DateTime? picked = await showDatePicker(
                    context: context,
                    initialDate: DateTime.now(),
                    firstDate: DateTime.now(),
                    lastDate: DateTime(2101),
                  );
                  if (picked != null) {
                    setState(() {
                      _selectedDate = picked;
                    });
                  }
                },
                child: Text(
                  _selectedDate == null ? 'Select Deadline *' : '${_selectedDate!.day}/${_selectedDate!.month}/${_selectedDate!.year}',
                ),
              ),
              Spacer(),
              Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text('Priority'),
                  DropdownButton<String>(
                    value: _selectedPriority,
                    onChanged: (newValue) {
                      setState(() {
                        _selectedPriority = newValue!;
                      });
                    },
                    items: ['Low', 'Medium', 'High']
                        .map<DropdownMenuItem<String>>((String value) {
                      return DropdownMenuItem<String>(
                        value: value,
                        child: Text(value),
                      );
                    }).toList(),
                  ),
                ],
              ),
            ],
          ),
          // "Create" and "Cancel" buttons
          SizedBox(height: 8),
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceAround,
            children: [
              ElevatedButton(
                onPressed: () => Navigator.of(context).pop(),
                child: Text('Cancel'),
              ),
              ElevatedButton(
                onPressed: _isFormValid ? _submitForm : null,
                style: ButtonStyle(
                  backgroundColor: MaterialStateProperty.resolveWith<Color>(
                        (Set<MaterialState> states) {
                      return _isFormValid ? Colors.blue : Colors.grey;
                    },
                  ),
                ),
                child: Text('Create Task'),
              ),
            ],
          ),
          // Pflichtfelder-Hinweis
          Padding(
            padding: const EdgeInsets.only(top: 16.0),
            child: Text(
              '* required fields',
              style: TextStyle(fontSize: 12, color: Colors.grey),
            ),
          ),
        ],
      ),
    );
  }
}