import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:image_picker/image_picker.dart';
import '../controllers/problem_controller.dart';
import 'package:permission_handler/permission_handler.dart';

class AddProblemController extends GetxController {
  final ProblemController _problemController = Get.put(ProblemController());

  final RxList<XFile> _selectedImages = <XFile>[].obs;
  final TextEditingController descriptionController = TextEditingController();
  final TextEditingController locationController = TextEditingController();
  final RxBool isLoading = false.obs;

  List<XFile> get selectedImages => _selectedImages;

  // 改进的 pickImage 方法
  Future<void> pickImage(ImageSource source) async {
    try {
      PermissionStatus status;
      String permissionName;
      String actionName;

      if (source == ImageSource.camera) {
        permissionName = "相机";
        actionName = "拍照";
        status = await Permission.camera.request();
      } else {
        permissionName = "相册";
        actionName = "选择图片";

        // 处理不同 Android 版本的相册权限
        if (await Permission.photos.isGranted) {
          status = PermissionStatus.granted;
        } else if (await Permission.storage.isGranted) {
          status = PermissionStatus.granted;
        } else {
          // 请求适当的权限
          status = await Permission.photos.request();

          // 如果 photos 权限被拒绝，尝试请求 storage 权限
          if (status.isDenied || status.isPermanentlyDenied) {
            status = await Permission.storage.request();
          }
        }
      }

      if (status.isGranted) {
        final ImagePicker picker = ImagePicker();
        final XFile? image = await picker.pickImage(source: source);

        if (image != null) {
          _selectedImages.add(image);
        }
      } else if (status.isPermanentlyDenied) {
        // 权限被永久拒绝，引导用户到设置
        _showPermissionDeniedDialog(permissionName, actionName);
      } else {
        Get.snackbar('权限被拒绝', '需要$permissionName权限才能$actionName');
      }
    } catch (e) {
      Get.snackbar('错误', '选择图片失败: $e');
    }
  }

  // 显示权限被拒绝的对话框
  void _showPermissionDeniedDialog(String permissionName, String actionName) {
    Get.dialog(
      AlertDialog(
        title: Text('权限被拒绝'),
        content: Text('需要$permissionName权限才能$actionName。是否要前往设置开启权限？'),
        actions: [
          TextButton(onPressed: () => Get.back(), child: Text('取消')),
          TextButton(
            onPressed: () async {
              Get.back();
              await openAppSettings();
            },
            child: Text('去设置'),
          ),
        ],
      ),
    );
  }

  Future<void> removeImage(int index) async {
    _selectedImages.removeAt(index);
  }

  bool get isFormValid {
    return descriptionController.text.isNotEmpty &&
        locationController.text.isNotEmpty;
  }

  Future<void> saveProblem() async {
    if (descriptionController.text.isEmpty) {
      Get.snackbar('错误', '请填写问题描述');
      return;
    }

    isLoading.value = true;

    try {
      await _problemController.addProblem(
        descriptionController.text,
        locationController.text,
        _selectedImages.toList(),
      );

      // 清空表单
      descriptionController.clear();
      locationController.clear();
      _selectedImages.clear();

      Get.back();
      Get.snackbar('成功', '问题已保存');
    } catch (e) {
      Get.snackbar('错误', '保存问题失败: $e');
    } finally {
      isLoading.value = false;
    }
  }

  @override
  void onClose() {
    descriptionController.dispose();
    locationController.dispose();
    super.onClose();
  }
}