import 'dart:io';
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:path_provider/path_provider.dart';
import 'package:path/path.dart' as path;
import '../../../core/utils/logger.dart';
import '../../../core/utils/app_snackbar.dart';
import '../../../core/services/image_processing_service.dart';
import '../../../core/services/invoice_upload_service.dart';
import '../../../core/network/dio_client.dart';

class ScannerController extends GetxController {
  var capturedImages = <File>[].obs;
  var isProcessing = false.obs;
  var uploadProgress = 0.0.obs;
  var companies = <Map<String, dynamic>>[].obs;
  var isLoadingCompanies = false.obs;

  final InvoiceUploadService _uploadService = InvoiceUploadService();

  @override
  void onInit() {
    super.onInit();
    fetchCompanies();
  }

  Future<void> fetchCompanies() async {
    isLoadingCompanies.value = true;
    try {
      final res = await DioClient().client.get('companies');
      if (res.data['success'] == true && res.data['data'] != null) {
        companies.value = List<Map<String, dynamic>>.from(res.data['data']);
      }
    } catch (e) {
      AppLogger.error('Failed to fetch companies', e);
    } finally {
      isLoadingCompanies.value = false;
    }
  }

  Future<void> addImage(String imagePath) async {
    File originalFile = File(imagePath);
    // Add to UI immediately so the user doesn't wait
    capturedImages.add(originalFile);
    int index = capturedImages.length - 1;

    // Process in background without showing full-screen loader
    ImageProcessingService.processInvoiceImage(originalFile).then((processedFile) {
      if (processedFile != null && index < capturedImages.length) {
        capturedImages[index] = processedFile;
        AppLogger.print('Finished processing image in background. Replaced in batch.');
      }
    }).catchError((e) {
        AppLogger.error('Failed to process image in background', e);
    });
  }

  void removeImage(int index) {
    if (index >= 0 && index < capturedImages.length) {
      capturedImages.removeAt(index);
    }
  }

  Future<void> uploadBatch(String fallbackCompanyId) async {
    if (capturedImages.isEmpty) {
      AppSnackbar.showWarning('تنبيه', 'الرجاء تصوير فاتورة واحدة على الأقل');
      return;
    }

    try {
      isProcessing.value = true;
      uploadProgress.value = 0.0;
      
      // Fetch a valid company ID dynamically to prevent 403 Forbidden
      String companyId = fallbackCompanyId;
      if (companyId == 'mock_company_id_123' || companyId.isEmpty) {
        final res = await DioClient().client.get('companies');
        if (res.data['success'] == true && res.data['data'] != null && res.data['data'].isNotEmpty) {
           companyId = res.data['data'][0]['id'];
           AppLogger.print('Dynamically fetched company: $companyId');
        } else {
           AppSnackbar.showError('خطأ', 'لا توجد شركات مسجلة في حسابك');
           isProcessing.value = false;
           return;
        }
      }

      AppLogger.print('Uploading batch of ${capturedImages.length} images to company $companyId...');
      
      final batchId = await _uploadService.uploadBatch(
        companyId: companyId,
        images: capturedImages,
        onProgress: (current, total) {
          uploadProgress.value = current / total;
        },
      );
      
      if (batchId != null) {
        capturedImages.clear();
        uploadProgress.value = 0.0;
        
        Get.defaultDialog(
          title: 'جاري المعالجة ⏳',
          middleText: 'تم استلام الفواتير بنجاح وسيتم إشعارك فور الانتهاء من تدقيقها عبر الذكاء الاصطناعي.',
          textConfirm: 'حسناً',
          confirmTextColor: Colors.white,
          buttonColor: const Color(0xFF0F4C81),
          onConfirm: () {
            if (Get.isDialogOpen ?? false) Get.back(); // close dialog
            Get.back(); // go back to dashboard
          },
          barrierDismissible: false,
          titleStyle: const TextStyle(fontFamily: 'El Messiri', fontWeight: FontWeight.bold, fontSize: 18),
          middleTextStyle: const TextStyle(fontFamily: 'El Messiri', fontSize: 14),
          radius: 12,
        );
      } else {
        AppSnackbar.showError('خطأ', 'فشل رفع الفواتير، يرجى المحاولة لاحقاً');
      }
    } catch (e) {
      AppLogger.error('Failed to upload batch', e);
      AppSnackbar.showError('خطأ', 'حدث خطأ غير متوقع أثناء الرفع');
    } finally {
      isProcessing.value = false;
    }
  }

  Future<String> getSavePath() async {
    final directory = await getTemporaryDirectory();
    final fileName = 'invoice_${DateTime.now().millisecondsSinceEpoch}.jpg';
    return path.join(directory.path, fileName);
  }
}