import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'task_provider.dart';
import 'task_model.dart';
import 'package:intl/intl.dart';

class AddTaskDialog extends StatefulWidget {
  @override
  _AddTaskDialogState createState() => _AddTaskDialogState();
}

class _AddTaskDialogState extends State<AddTaskDialog> {
  final _formKey = GlobalKey<FormState>();
  String _title = '';
  String? _description;
  String? _category;
  DateTime? _selectedDeadline;
  TaskPriority _selectedPriority = TaskPriority.medium;

  @override
  Widget build(BuildContext context) {
    return AlertDialog(
      title: Text('Add New Task'),
      content: Form(
        key: _formKey,
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            TextFormField(
              decoration: InputDecoration(labelText: 'Task Title*'),
              validator: (value) {
                if (value == null || value.isEmpty) {
                  return 'Please enter a task title';
                }
                return null;
              },
              onSaved: (value) {
                _title = value ?? '';
              },
            ),
            TextFormField(
              decoration: InputDecoration(labelText: 'Description (optional)'),
              onSaved: (value) {
                _description = value;
              },
            ),
            TextFormField(
              decoration: InputDecoration(labelText: 'Category (optional)'),
              onSaved: (value) {
                _category = value;
              },
            ),
            SizedBox(height: 20),
            Text('Deadline: ${_selectedDeadline != null ? DateFormat('yMMMd').format(_selectedDeadline!) : 'No deadline'}'),
            ElevatedButton(
              child: Text('Select Deadline'),
              onPressed: () => _selectDeadline(context),
            ),
            DropdownButton<TaskPriority>(
              value: _selectedPriority,
              onChanged: (TaskPriority? newValue) {
                setState(() {
                  _selectedPriority = newValue!;
                });
              },
              items: TaskPriority.values.map((TaskPriority priority) {
                return DropdownMenuItem<TaskPriority>(
                  value: priority,
                  child: Text(priority.toString().split('.').last),
                );
              }).toList(),
            ),
          ],
        ),
      ),
      actions: [
        TextButton(
          child: Text('Cancel'),
          onPressed: () {
            Navigator.of(context).pop();
          },
        ),
        ElevatedButton(
          child: Text('Add Task'),
          onPressed: () {
            if (_formKey.currentState!.validate()) {
              _formKey.currentState!.save();
              Provider.of<TaskProvider>(context, listen: false).addTask(
                title: _title,
                description: _description,
                category: _category,
                deadline: _selectedDeadline,
                priority: _selectedPriority,
              );
              Navigator.of(context).pop();
            }
          },
        ),
      ],
    );
  }

  Future<void> _selectDeadline(BuildContext context) async {
    final DateTime? picked = await showDatePicker(
      context: context,
      initialDate: DateTime.now(),
      firstDate: DateTime.now(),
      lastDate: DateTime(2100),
    );
    if (picked != null) {
      setState(() {
        _selectedDeadline = picked;
      });
    }
  }
}