edit_screen.dart

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

import 'package:flutter_supabase_yt_1/models/models.dart';
import 'package:flutter_supabase_yt_1/utils/utils.dart';

class EditScreen extends StatefulWidget {
  const EditScreen({
    Key? key,
    required this.todo,
  }) : super(key: key);

  // this is the arguments for the edit screen.
  // Whenever we route to editscreen, we need to pass the todo.
  // This is done because then only we can fetch the title and id of the todo.
  // You can achieve this type of quality by using state mangagement also.
  final Todo todo;

  @override
  State<EditScreen> createState() => _EditScreenState();
}

class _EditScreenState extends State<EditScreen> {
  TextEditingController todoController = TextEditingController();

  @override
  void initState() {
    // we are changing the value of todoController so that the title which user
    // has set can be showed in the controller as default.
    todoController.text = widget.todo.title;

    super.initState();
  }

  @override
  void dispose() {
    todoController.dispose();
    super.dispose();
  }

// instance
  SupabaseDataManager supabaseDataManager = SupabaseDataManager();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Create')),
      body: Padding(
        padding: const EdgeInsets.all(20),
        child: Form(
            child: Column(
          children: [
            TextFormField(
              // controller
              controller: todoController,
              decoration: const InputDecoration(hintText: 'Todo'),
            ),
            ElevatedButton(onPressed: _updateData, child: const Text('Update'))
          ],
        )),
      ),
    );
  }

  Future _updateData() async {
    // we are changing the todoController title value so that we don't have to write the todo again.
    // we are just using the todo from the arguments 👆, but we are changing the title to todoController text value.
    Todo todo = widget.todo.copyWith(title: todoController.text);

    PostgrestResponse<dynamic> res = await supabaseDataManager.updateTodo(todo);

    if (res.error != null) {
      // ignore: use_build_context_synchronously
      ScaffoldMessenger.of(context)
          .showSnackBar(SnackBar(content: Text(res.error!.message)));
    }

    // ignore: use_build_context_synchronously
    ScaffoldMessenger.of(context)
        .showSnackBar(SnackBar(content: Text('Updated')));
  }
}