import 'package:flutter/material.dart';

import 'package:Stocky/Pages/controllers/MainController.dart';
import 'package:Stocky/classes/styles.dart';
import 'package:Stocky/models/task_adapter.dart';

import 'package:get/get.dart';

class TaskFormScreen extends StatefulWidget {
  final Task? task;

  const TaskFormScreen({super.key, this.task});

  @override
  State<TaskFormScreen> createState() => _TaskFormScreenState();
}

class _TaskFormScreenState extends State<TaskFormScreen> {
  final _formKey = GlobalKey<FormState>();
  final _titleController = TextEditingController();
  final _descriptionController = TextEditingController();
  final _itemsController = TextEditingController();

  DateTime? _selectedDate;

  List<Subtask> _items = [];
  String _newItem = '';

  @override
  void initState() {
    super.initState();
    if (widget.task != null) {
      _titleController.text = widget.task!.title;
      _descriptionController.text = widget.task!.description;
      _selectedDate = widget.task!.startTime;
      _items = List.from(widget.task!.items);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(
          widget.task != null ? 'Редактировать задачу' : 'Новая задача',
        ),
        actions: [
          TextButton(
            onPressed: _saveTask,
            child: const Text('Сохранить', style: TextStyle(fontSize: 16)),
          ),
        ],
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Form(
          key: _formKey,
          child: ListView(
            children: [
              // Дата создания
              ListTile(
                title: Text(
                  _selectedDate != null
                      ? 'Дата: ${_selectedDate!.day}.${_selectedDate!.month}.${_selectedDate!.year}'
                      : 'Выберите дату',
                ),
                trailing: const Icon(Icons.calendar_today),
                onTap: _selectDate,
              ),

              TextFormField(
                controller: _titleController,
                decoration: const InputDecoration(
                  labelText: 'Название задачи',
                  border: OutlineInputBorder(),
                ),
                validator: (value) {
                  if (value == null || value.isEmpty) {
                    return 'Введите название задачи';
                  }
                  return null;
                },
              ),
              const SizedBox(height: 16),

              // Описание (опционально)
              TextFormField(
                controller: _descriptionController,
                decoration: const InputDecoration(
                  labelText: 'Описание',
                  border: OutlineInputBorder(),
                  alignLabelWithHint: true,
                ),
                maxLines: 3,
              ),
              const SizedBox(height: 16),

              // Пункты задачи (чеклист)
              Text('Пункты задачи', style: AppStyles.titleSmall),
              const SizedBox(height: 8),
              Row(
                children: [
                  Expanded(
                    child: TextField(
                      controller: _itemsController,
                      decoration: const InputDecoration(
                        labelText: 'Добавить пункт',
                        border: OutlineInputBorder(),
                      ),
                      onChanged: (value) {
                        _newItem = value;
                      },
                    ),
                  ),
                  IconButton(icon: const Icon(Icons.add), onPressed: _addItem),
                ],
              ),
              const SizedBox(height: 8),

              // Список пунктов
              if (_items.isNotEmpty)
                ..._items.map(
                  (item) => Card(
                    child: ListTile(
                      title: Text(item.text),
                      trailing: IconButton(
                        icon: const Icon(Icons.delete, color: Colors.red),
                        onPressed: () => _removeItem(item),
                      ),
                    ),
                  ),
                ),
            ],
          ),
        ),
      ),
    );
  }

  void _selectDate() async {
    final DateTime? picked = await showDatePicker(
      context: context,
      initialDate: _selectedDate ?? DateTime.now(),
      firstDate: DateTime(2020),
      lastDate: DateTime(2101),
    );
    if (picked != null) {
      setState(() {
        _selectedDate = picked;
      });
    }
  }

  void _addItem() {
    if (_newItem.trim().isNotEmpty) {
      setState(() {
        _items.add(
          Subtask(
            id: DateTime.now().microsecondsSinceEpoch.toString(),
            text: _newItem.trim(),
            isDone: false,
          ),
        );

        _itemsController.clear();
        _newItem = '';
      });
    }
  }

  void _removeItem(Subtask item) {
    setState(() {
      _items.remove(item);
    });
  }

  void _saveTask() {
    if (_formKey.currentState!.validate()) {
      final mainController = Get.find<MainController>();

      String generateId() {
        return DateTime.now().microsecondsSinceEpoch.toString();
      }

      final task = Task(
        id: widget.task?.id ?? generateId(),
        title: _titleController.text,
        description: _descriptionController.text.trim(),
        startTime: _selectedDate ?? DateTime.now(),
        items: List.from(_items),
        author: mainController.username.value,
        executor: mainController.username.value,
        isSynced: false,
        isDeletedLocally: false,
      );

      try {
        if (widget.task == null) {
          mainController.addTask(task);
        } else {
          mainController.updateTask(task);
        }
        Get.back();
      } catch (e) {
        ScaffoldMessenger.of(
          context,
        ).showSnackBar(SnackBar(content: Text('Ошибка сохранения: $e')));
      }
    }
  }
}