import 'dart:io';
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:getx_scaffold/getx_scaffold.dart';
import 'package:image_picker/image_picker.dart';
import 'package:ln_jq_app/common/model/base_model.dart';
import 'package:ln_jq_app/common/model/vehicle_info.dart';
import 'package:ln_jq_app/storage_service.dart';
import 'package:mobile_scanner/mobile_scanner.dart';
import 'package:permission_handler/permission_handler.dart';

class QrCodeController extends GetxController
    with BaseControllerMixin, GetSingleTickerProviderStateMixin {
  @override
  String get builderId => 'qrcode';

  // --- Animation ---
  late final AnimationController animationController;
  late final Animation<double> scanAnimation;

  // --- 使用 MobileScanner 的控制器 ---
  final MobileScannerController scannerController = MobileScannerController();

  final RxBool isFlashOn = false.obs;
  final RxBool isProcessingResult = false.obs;

  @override
  void onInit() {
    super.onInit();
    requestPermission();

    animationController = AnimationController(
      duration: const Duration(milliseconds: 2500),
      vsync: this,
    );
    scanAnimation =
        Tween<double>(begin: 0, end: 1).animate(animationController);
    animationController.repeat(reverse: false);
  }

  /// MobileScanner 的 onDetect 回调方法
  void onDetect(BarcodeCapture capture) {
    if (isProcessingResult.value) return;

    final Barcode? barcode = capture.barcodes.firstOrNull;
    if (barcode?.rawValue != null && barcode!.rawValue!.isNotEmpty) {
      isProcessingResult.value = true;
      scannerController.stop();
      animationController.stop();
      print("相机识别到的内容: ${barcode.rawValue!}");
      renderResult(barcode.rawValue!);
    }
  }

  /// 恢复扫描状态
  void resumeScanner() {
    isProcessingResult.value = false;
    try {
      scannerController.start();
    } catch (e) {
      print("无法重启相机: $e");
    }
    animationController.repeat(reverse: false);
  }

  /// 从相册选择图片并扫描二维码
  void scanFromGallery() async {
    try {
      final XFile? imageFile =
      await ImagePicker().pickImage(source: ImageSource.gallery);
      if (imageFile == null) {
        return;
      }

      scannerController.stop();
      animationController.stop();
      showLoading("正在识别...");

      final BarcodeCapture? capture =
      await scannerController.analyzeImage(imageFile.path);

      dismissLoading();

      final Barcode? firstBarcode = capture?.barcodes.firstOrNull;

      if (firstBarcode?.rawValue != null &&
          firstBarcode!.rawValue!.isNotEmpty) {
        final String scanResult = firstBarcode.rawValue!;
        print("相册识别到的内容: $scanResult");
        renderResult(scanResult);
      } else {
        showErrorToast('未识别到二维码');
        resumeScanner();
      }
    } catch (e, stackTrace) {
      dismissLoading();
      showErrorToast('从相册选择失败，请稍后重试');
      print("scanFromGallery Error: $e\n$stackTrace");
      resumeScanner();
    }
  }

  /// 切换闪光灯
  void toggleFlash() async {
    try {
      await scannerController.toggleTorch();
      final currentTorchState = scannerController.value.torchState;
      isFlashOn.value = currentTorchState == TorchState.on;
    } catch (e) {
      print("切换闪光灯失败: $e");
      showErrorToast("无法打开闪光灯");
    }
  }

  /// 翻转相机
  void flipCamera() async {
    await scannerController.switchCamera();
  }

  /// 请求相机权限
  void requestPermission() async {
    var status = await Permission.camera.request();
    if (!status.isGranted) {
      showErrorToast('请授予相机权限以使用扫描功能');
      Get.back();
    }
  }

  void requestPhotoPermission() async {
    var status = await Permission.photos.request();
    if (status.isGranted) {
      scanFromGallery();
    } else if (status.isPermanentlyDenied) {
      openAppSettings();
    } else {
      showErrorToast('需要相册权限才能从相册中选择图片');
    }
  }

  /// 处理扫描结果
  void renderResult(String resultStr, {plateNumber}) async {
    showLoading("正在获取车辆信息...");
    try {
      final Map<String, dynamic> requestData = {
        "code": resultStr,
        "phone": StorageService.to.phone,
      };
      if (plateNumber != null && plateNumber.isNotEmpty) {
        requestData['plateNumber'] = plateNumber;
      }
      var responseData = await HttpService.to.post(
        "appointment/truck/bindTruck",
        data: requestData,
      );

      if (responseData == null) {
        dismissLoading();
        showToast('无法获取车辆信息，请检查网络或稍后重试');
        resumeScanner();
        return;
      }
      var result = BaseModel.fromJson(responseData.data);

      if (result.code != 0) {
        showToast(result.error);
        dismissLoading();
        resumeScanner(); // 绑定失败也要恢复扫描
        return;
      }

      if (result.data == null) {
        dismissLoading();
        showBindDialog(resultStr);
        return;
      }

      final vehicle = VehicleInfo.fromJson(result.data as Map<String, dynamic>);
      await StorageService.to.saveVehicleInfo(vehicle);
      dismissLoading();
      Get.back(result: true);

    } on DioException catch (_) {
      showErrorToast("网络请求失败，请稍后重试");
      resumeScanner();
    } catch (e, _) {
      showErrorToast("处理失败，请稍后重舍");
      resumeScanner();
    } finally {
      if (Get.isDialogOpen ?? false) {
        dismissLoading();
      }
    }
  }

  /// 显示绑定确认对话框
  void showBindDialog(String resultStr) {
    final TextEditingController plateNumberController = TextEditingController();
    // 使用 showConfirmDialog，它有 onCancel 回调
    DialogX.to.showConfirmDialog(
      title: '请输入车牌号',
      barrierDismissible: false,
      content: TextField(
        controller: plateNumberController,
        autofocus: false,
        decoration: const InputDecoration(
          hintText: '请输入完整的车牌号',
          border: OutlineInputBorder(),
          contentPadding: EdgeInsets.symmetric(horizontal: 12.0),
        ),
      ),
      confirmText: '确认绑定',
      cancelText: '取消', // showConfirmDialog 有 cancelText
      onConfirm: () {
        final String plateNumber = plateNumberController.text.trim();
        if (plateNumber.isEmpty) {
          showToast("请输入车牌号");
          // 返回 false 可以阻止弹窗关闭，让用户继续输入
          return false;
        }
        renderResult(resultStr, plateNumber: plateNumber);
        //关闭弹窗
        return true;
      },
      onCancel: () {
        // 如果用户点击取消，恢复扫描
        resumeScanner();
      },
    );
  }

  @override
  void onClose() {
    scannerController.dispose();
    animationController.dispose();
    super.onClose();
  }
}