import 'package:camera/camera.dart';
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:translator_lux/config/config.dart';
import 'package:translator_lux/global/global_state.dart';

class CameraPage extends StatefulWidget {
  const CameraPage({super.key});

  @override
  State<CameraPage> createState() => _CameraPageState();
}

class _CameraPageState extends State<CameraPage> {
  late CameraController controller;

  @override
  void initState() {
    super.initState();
    controller =
        CameraController(AppConfig.cameraList[0], ResolutionPreset.high);
    controller.initialize().then((_) {
      if (!mounted) {
        return;
      }
      setState(() {});
    }).catchError((Object e) {
      if (e is CameraException) {
        switch (e.code) {
          case 'CameraAccessDenied':
            // Handle access errors here.
            break;
          default:
            // Handle other errors here.
            break;
        }
      }
    });
  }

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

  @override
  Widget build(BuildContext context) {
    if (!controller.value.isInitialized) {
      return Container();
    }
    // 设备尺寸
    final Size size = MediaQuery.of(context).size;
    return Scaffold(
      body: Stack(children: [
        _cameraView(size),
        SafeArea(
            child: Padding(
          padding: const EdgeInsets.symmetric(horizontal: 20),
          child: Column(
            children: [
              Row(
                children: [
                  GestureDetector(
                    onTap: () {
                      Get.back();
                    },
                    child: Container(
                      alignment: Alignment.center,
                      margin: const EdgeInsets.all(10),
                      decoration: BoxDecoration(
                          color: Colors.black,
                          borderRadius: BorderRadius.circular(30)),
                      child: const Padding(
                        padding: EdgeInsets.all(8.0),
                        child: Icon(
                          Icons.arrow_back_ios,
                          color: Colors.white,
                          size: 18,
                        ),
                      ),
                    ),
                  ),
                  Container(
                    alignment: Alignment.center,
                    margin: const EdgeInsets.all(10),
                    decoration: BoxDecoration(
                        color: Colors.black,
                        borderRadius: BorderRadius.circular(30)),
                    child: Padding(
                      padding: const EdgeInsets.all(8.0),
                      child: SizedBox(
                        width: 100,
                        child: Row(
                          children: [
                            Text(
                              GlobalState.fromCountryName.value,
                              style: const TextStyle(
                                  fontSize: 14, color: Colors.white),
                            ),
                          ],
                        ),
                      ),
                    ),
                  )
                ],
              )
            ],
          ),
        )),
      ]),
    );
  }

  Widget _cameraView(Size size) {
    // 设备像素比
    final double deviceRatio = size.width / size.height;
    // 相机纵横比
    final double aspectRatio = controller.value.aspectRatio;
    return Center(
      child: Transform.scale(
        scale: aspectRatio / deviceRatio,
        child: AspectRatio(
          aspectRatio: aspectRatio,
          child: Center(child: CameraPreview(controller)),
        ),
      ),
    );
  }
}