import 'package:flutter/material.dart';

// This is an example of a bottom sheet with a text field inside a tab
// and a footer with another text field.

// Please use a tablet simulator on landscape mode to better see the issue.

// When the text field of tab 1 is pressed and focused, the keyboard appears and
// resizes the bottom sheet correctly. However, the footer go over the whole content of tab 1 which
// causes the user to not see what's being written.

// I came up with several workarounds but I don't feel it's the right way to handle that kind of situation.
// It really felt too "hacky"

// My current workarounds:
//  1- I tried switching the visibility off of the footer when the tab1's text field is focused.
//  2- I tried addind a "resizeToAvoidBottomInset: false" to the Scaffold of the bottom sheet and
//     adding a listener to the focus node of the footer text field.
//     Whenever it is focused, I set the bottom padding to MediaQuery.viewInsetsOf(context).bottom
//     This way, only when the footer text field is focused, the footer is "lifted up" to avoid the keyboard.
//     When the tab1's text field is focused, nothing is being resized.

// Any suggestions or pointers would be appreciated. Thank you

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData.dark(),
      home: const MyHomePage(title: 'Bottom sheet demo'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});
  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  void _onPressed() {
    showModalBottomSheet(
      context: context,
      useSafeArea: true,
      isScrollControlled: true,
      isDismissible: true,
      builder: (context) => SomeBottomSheet(),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text(widget.title)),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            ElevatedButton(
              onPressed: _onPressed,
              child: Text("Open bottom sheet"),
            ),
          ],
        ),
      ),
    );
  }
}

class SomeBottomSheet extends StatelessWidget {
  const SomeBottomSheet({super.key});

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: () => FocusManager.instance.primaryFocus?.unfocus(),
      child: Scaffold(
        body: SafeArea(
          child: Padding(
            padding: const EdgeInsets.all(16.0),
            child: Column(
              mainAxisSize: MainAxisSize.min,
              children: [
                Expanded(child: SomeBody()),
                SomeFooter(),
              ],
            ),
          ),
        ),
      ),
    );
  }
}

class SomeBody extends StatelessWidget {
  const SomeBody({super.key});

  @override
  Widget build(BuildContext context) {
    return DefaultTabController(
      length: 2,
      child: Column(
        children: [
          TabBar(
            tabs: [
              Tab(text: "Tab 1"),
              Tab(text: "Tab 2"),
            ],
          ),
          Expanded(
            child: Padding(
              padding: const EdgeInsets.all(8.0),
              child: TabBarView(children: [Tab1Content(), Tab2Content()]),
            ),
          ),
        ],
      ),
    );
  }
}

class Tab1Content extends StatelessWidget {
  const Tab1Content({super.key});

  @override
  Widget build(BuildContext context) {
    return SingleChildScrollView(
      child: Column(
        spacing: 20,
        children: [
          TextField(decoration: InputDecoration(labelText: "Some label")),
          ElevatedButton(onPressed: () {}, child: Text("Submit")),
        ],
      ),
    );
  }
}

/// Demonstration purposes only - close to my real use case
class Tab2Content extends StatelessWidget {
  const Tab2Content({super.key});

  @override
  Widget build(BuildContext context) {
    return ListView.separated(
      itemCount: 20,
      separatorBuilder: (context, index) => Divider(),
      itemBuilder: (context, index) =>
          ListTile(title: Text("Item ${index + 1}")),
    );
  }
}

class SomeFooter extends StatelessWidget {
  const SomeFooter({super.key});

  @override
  Widget build(BuildContext context) {
    return DecoratedBox(
      decoration: BoxDecoration(
        color: Colors.black45,
        borderRadius: BorderRadius.circular(12),
      ),
      child: Padding(
        padding: const EdgeInsets.all(8.0),
        child: Column(
          children: [
            TextField(decoration: InputDecoration(labelText: "Footer input")),
            SizedBox(height: 75), // This is a placeholder for any content.
            ElevatedButton(onPressed: () {}, child: Text("Footer button")),
          ],
        ),
      ),
    );
  }
}