import "dart:io";
import "package:flutter/material.dart";
import "package:camera/camera.dart";
import "package:video_player/video_player.dart";

void main()
{
	runApp(Builder(builder: (context) => const MaterialApp(home: MyHomePage())));
}

class MyHomePage extends StatefulWidget
{
	const MyHomePage({super.key});
	@override State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage>
{
	bool loading = false;
	bool ready = false;
	int counter = 0;
	CameraController? camera_cont;
	VideoPlayerController? cont;

	@override void dispose()
	{
		camera_cont?.dispose();
		super.dispose();
	}

	init_camera() async
	{
		setState(() => loading = true);
		final cameras = await availableCameras();
		camera_cont = CameraController(cameras.firstWhere((camera) => camera.lensDirection == CameraLensDirection.back), ResolutionPreset.ultraHigh);
		await camera_cont!.initialize();
		setState(() => loading = false);
		await camera_cont!.prepareForVideoRecording();
		await camera_cont!.startVideoRecording();
		for(int i = 0; i < 200; i++)
		{
			setState(() => counter = i);
			await Future.delayed(const Duration(milliseconds: 100));
			await camera_cont!.pauseVideoRecording();
			await camera_cont!.resumeVideoRecording();
		}
		setState(() => ready = true);
	}

	void stop() async
	{
		final file = await camera_cont!.stopVideoRecording();
		setState(() => cont = VideoPlayerController.file(File(file.path))..initialize()..setLooping(true)..play());
	}

	@override Widget build(BuildContext context)
	{
		if(camera_cont == null && !loading)return Center(child: FilledButton(onPressed: init_camera, child: const Text("Start")));
		if(cont != null)return VideoPlayer(cont!);
		if(loading)return const Center(child: CircularProgressIndicator());
		return Stack(
			alignment: Alignment.center,
			children: [
				CameraPreview(camera_cont!),
				if(!ready)Text("$counter"),
				if(!ready)const CircularProgressIndicator(),
				if(ready)FilledButton(onPressed: stop, child: const Text("Stop")),
			],
		);
	}
}