import 'dart:io';
import 'package:file_picker/file_picker.dart';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:provider/provider.dart';
import 'package:test_sa/controllers/providers/api/devices_provider.dart';
import 'package:test_sa/extensions/context_extension.dart';
import 'package:test_sa/extensions/string_extensions.dart';
import 'package:test_sa/extensions/text_extensions.dart';
import 'package:test_sa/extensions/widget_extensions.dart';
import 'package:test_sa/models/device/predict_device_model.dart';
import 'package:test_sa/new_views/app_style/app_color.dart';
import 'package:test_sa/new_views/common_widgets/app_lazy_loading.dart';
import 'package:test_sa/views/widgets/equipment/predict_device_list.dart';

enum _ImagePickSource { camera, gallery, files }

class CopilotHelper {
  static Future<PredictedAsset?> pickImageFromCamera(BuildContext context, {bool pickMode = false}) {
    return _pickImage(context, pickMode: pickMode, allowGallery: false);
  }

  static Future<PredictedAsset?> pickImageForInventorySession(BuildContext context, {bool pickMode = true}) {
    return _pickImage(context, pickMode: pickMode, allowGallery: true);
  }

  static Future<PredictedAsset?> _pickImage(BuildContext context, {bool pickMode = false, bool allowGallery = false}) async {
    _ImagePickSource source = _ImagePickSource.camera;

    if (allowGallery) {
      final _ImagePickSource? selected = await _showImageSourceSheet(context);
      if (selected == null) return null;
      if (!context.mounted) return null;
      source = selected;
    }

    if (source == _ImagePickSource.files) {
      return _pickFromFiles(context, pickMode: pickMode);
    }

    if (source == _ImagePickSource.gallery) {
      return openCamera(context, pickMode: pickMode, source: ImageSource.gallery);
    }

    final status = await Permission.camera.status;

    if (status.isGranted) {
      return openCamera(context, pickMode: pickMode, source: ImageSource.camera);
    }

    final permission = await Permission.camera.request();

    if (permission.isGranted) {
      return openCamera(context, pickMode: pickMode, source: ImageSource.camera);
    }

    if (permission.isPermanentlyDenied) {
      await openAppSettings();
      return null;
    }

    debugPrint('Camera permission denied');
    return null;
  }

  static Future<PredictedAsset?> _pickFromFiles(BuildContext context, {bool pickMode = false}) async {
    final FilePickerResult? result = await FilePicker.platform.pickFiles(
      type: FileType.image,
      allowMultiple: false,
    );

    final String? path = result?.files.single.path;
    if (path == null) return null;

    final File imageFile = File(path);
    debugPrint('CopilotHelper: picked image extension = ${imageFile.path.split('.').last}');

    if (!context.mounted) return null;
    return uploadImage(imageFile, context, pickMode: pickMode);
  }

  static Future<_ImagePickSource?> _showImageSourceSheet(BuildContext context) {
    return showModalBottomSheet<_ImagePickSource>(
      context: context,
      builder: (BuildContext context) {
        Widget sourceCard({required String icon, required String label, required VoidCallback onTap}) {
          return Container(
            padding: const EdgeInsets.all(12),
            decoration: BoxDecoration(
              color: AppColor.background(context),
              borderRadius: BorderRadius.circular(16),
              border: Border.all(color: AppColor.borderColor(context), width: 2),
            ),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: [
                icon.toSvgAsset(width: 24, height: 24, color: AppColor.icon2Color(context)),
                label.bodyText2(context).custom(color: AppColor.labelTextStyleColor(context)),
              ],
            ),
          ).onPress(onTap);
        }

        List<Widget> listItems = [
          sourceCard(
            icon: 'camera_icon',
            label: '${context.translation.open}\n${context.translation.camera}',
            onTap: () => Navigator.of(context).pop(_ImagePickSource.camera),
          ),
          sourceCard(
            icon: 'gallery_icon',
            label: '${context.translation.open}\n${context.translation.gallery}',
            onTap: () => Navigator.of(context).pop(_ImagePickSource.gallery),
          ),
          sourceCard(
            icon: 'file_icon',
            label: '${context.translation.open}\n${context.translation.files}',
            onTap: () => Navigator.of(context).pop(_ImagePickSource.files),
          ),
        ];

        return SafeArea(
          top: false,
          child: Container(
            width: double.infinity,
            color: AppColor.bottomSheetColor(context),
            padding: const EdgeInsets.all(16.0),
            child: Column(
              mainAxisSize: MainAxisSize.min,
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                'Scan Asset'.addTranslation.heading4(context),
                GridView.builder(
                  padding: const EdgeInsets.only(top: 16, bottom: 0),
                  shrinkWrap: true,
                  physics: const NeverScrollableScrollPhysics(),
                  gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 3, childAspectRatio: 1, crossAxisSpacing: 16, mainAxisSpacing: 16),
                  itemCount: listItems.length,
                  itemBuilder: (context, index) => listItems[index],
                ),
              ],
            ),
          ),
        );
      },
    );
  }

  static Future<PredictedAsset?> openCamera(BuildContext context, {bool pickMode = false, ImageSource source = ImageSource.camera}) async {
    final XFile? pickedFile = await ImagePicker().pickImage(
      source: source,
      imageQuality: 70,
    );

    if (pickedFile == null) {
      return null;
    }

    final File imageFile = File(pickedFile.path);
    debugPrint('CopilotHelper: picked image extension = ${imageFile.path.split('.').last}');

    if (!context.mounted) return null;
    return uploadImage(imageFile, context, pickMode: pickMode);
  }

  static Future<PredictedAsset?> uploadImage(File imageFile, BuildContext context, {bool pickMode = false}) async {
    try {
      showDialog(context: context, barrierDismissible: false, builder: (context) => const AppLazyLoading());
      AssetProvider assetProvider = Provider.of<AssetProvider>(context, listen: false);

      PredictDeviceResponse? response = await assetProvider.predictDevice(imageFile);
      Navigator.pop(context);
      if (response != null && response.success == true) {
        final List<PredictedAsset> predictedAssetList = response.predictedAsset ?? [];
        if (predictedAssetList.isNotEmpty) {
          return Navigator.push<PredictedAsset?>(
            context,
            MaterialPageRoute(builder: (context) => PredictDeviceView(predictedAsset: predictedAssetList, pickMode: pickMode)),
          );
        } else {
          context.showInfoDialog("No Predicted asset found");
        }
      } else {
        context.showInfoDialog("Failed to recognize the asset. Please try again.");
      }
    } catch (e) {
      debugPrint('Upload error: $e');
    }
    return null;
  }
}