import 'package:flutter/material.dart';

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(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

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

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  List<TTCState> data = [
    TTCState.empty,
    TTCState.empty,
    TTCState.empty,
    TTCState.empty,
    TTCState.empty,
    TTCState.empty,
    TTCState.empty,
    TTCState.empty,
    TTCState.empty,
  ];

  TTCState turn = TTCState.x;

  void setCellState(int index) {
    setState(() {
      data[index] = turn;

      turn = switch (turn) {
        TTCState.x => TTCState.o,
        TTCState.o => TTCState.x,
        TTCState.empty => TTCState.empty,
      };
    });
  }

  Widget _genCell(int index, TTCState state) => Container(
      decoration: BoxDecoration(border: Border.all()),
      child: Center(
          child: TTCCell(
        state: state,
        stateSetCallback: () {
          setCellState(index);
        },
      )));

  Widget _genGridvew() {
    List<Widget> cells = [];
    for (final (index, state) in data.indexed) {
      cells.add(_genCell(index, state));
    }
    return GridView.count(
      crossAxisCount: 3,
      shrinkWrap: true,
      children: cells,
    );
  }

  String _turnText(TTCState state) => switch (state) {
        TTCState.x => "X",
        TTCState.o => "O",
        TTCState.empty => "O",
      };

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
      ),
      body: Padding(
          padding: EdgeInsets.all(10),
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              const Spacer(flex: 5),
              Center(
                  child: Text(
                "${_turnText(turn)}'s turn",
                style:
                    const TextStyle(fontSize: 30, fontWeight: FontWeight.bold),
              )),
              const Spacer(flex: 1),
              _genGridvew(),
              const Spacer(flex: 5),
            ],
          )),
    );
  }
}

enum TTCState { empty, x, o }

class TTCCell extends StatelessWidget {
  const TTCCell({super.key, required this.state, this.stateSetCallback});

  final TTCState state;
  final VoidCallback? stateSetCallback;

  @override
  Widget build(BuildContext context) => switch (state) {
        TTCState.empty => ElevatedButton(
            onPressed: stateSetCallback, child: const Text("none")),
        TTCState.x => const Text("X"),
        TTCState.o => const Text("O"),
      };
}