import 'dart:io';
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:dio/dio.dart';
import 'package:path_provider/path_provider.dart';
import 'package:share_plus/share_plus.dart';
import '../../../core/network/dio_client.dart';
import '../../../core/utils/app_snackbar.dart';
import '../../../core/utils/logger.dart';

class InvoiceDetailController extends GetxController {
  var invoice = {}.obs;
  var isLoading = true.obs;
  var isSaving = false.obs;
  String? invoiceId;

  @override
  void onInit() {
    super.onInit();
    final args = Get.arguments;
    if (args != null) {
      if (args is Map) {
        invoiceId = args['id']?.toString();
      } else if (args is String) {
        invoiceId = args;
      }
      
      if (invoiceId != null) {
        fetchInvoiceDetails();
      }
    }
  }

  Future<void> fetchInvoiceDetails() async {
    try {
      isLoading.value = true;
      final res = await DioClient()
          .client
          .get('invoices/view', queryParameters: {'id': invoiceId});

      if (res.data['success'] == true && res.data['data'] != null) {
        invoice.value = res.data['data'];
      } else {
        AppSnackbar.showError('خطأ', 'لم يتم العثور على الفاتورة');
        Get.back();
      }
    } catch (e) {
      AppLogger.error('Failed to fetch invoice details', e);
      AppSnackbar.showError('خطأ', 'فشل تحميل بيانات الفاتورة');
      Get.back();
    } finally {
      isLoading.value = false;
    }
  }

  Future<void> updateInvoice(Map<String, dynamic> data) async {
    try {
      isSaving.value = true;
      data['id'] = invoiceId;
      final res = await DioClient().client.post('invoices/update', data: data);
      if (res.data['success'] == true) {
        AppSnackbar.showSuccess('تم الحفظ', 'تم تحديث بيانات الفاتورة');
        await fetchInvoiceDetails();
      } else {
        AppSnackbar.showError('خطأ', res.data['message'] ?? 'فشل التحديث');
      }
    } catch (e) {
      AppLogger.error('Failed to update invoice', e);
      AppSnackbar.showError('خطأ', 'حدث خطأ أثناء التحديث');
    } finally {
      isSaving.value = false;
    }
  }

  Future<void> approveInvoice() async {
    // First check for duplicates
    try {
      final dupRes = await DioClient().client.post('invoices/check-duplicate', data: {
        'invoice_number': invoice['invoice_number'],
        'supplier_tin': invoice['supplier_tin'],
        'grand_total': invoice['grand_total'],
        'invoice_date': invoice['invoice_date'],
        'exclude_id': invoiceId,
      });

      if (dupRes.data['success'] == true) {
        final matches = dupRes.data['data']?['matches'] as List? ?? [];
        if (matches.isNotEmpty) {
          // Show duplicate warning
          final proceed = await Get.dialog<bool>(
            AlertDialog(
              title: const Row(
                children: [
                  Icon(Icons.warning_amber, color: Colors.orange, size: 28),
                  SizedBox(width: 8),
                  Text('تحذير — فاتورة مكررة!', style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold)),
                ],
              ),
              content: Column(
                mainAxisSize: MainAxisSize.min,
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text('تم العثور على ${matches.length} فاتورة مشابهة:', style: const TextStyle(fontWeight: FontWeight.w600)),
                  const SizedBox(height: 12),
                  ...matches.take(3).map((m) => Container(
                    margin: const EdgeInsets.only(bottom: 8),
                    padding: const EdgeInsets.all(10),
                    decoration: BoxDecoration(
                      color: Colors.orange.withValues(alpha: 0.08),
                      borderRadius: BorderRadius.circular(8),
                      border: Border.all(color: Colors.orange.withValues(alpha: 0.3)),
                    ),
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        Text('رقم: ${m['invoice_number'] ?? '—'}', style: const TextStyle(fontSize: 13, fontWeight: FontWeight.w600)),
                        Text('المورد: ${m['supplier_name'] ?? '—'}', style: const TextStyle(fontSize: 12)),
                        Text('المبلغ: ${m['grand_total'] ?? '—'} | نوع التطابق: ${m['match_type'] ?? '—'}', style: const TextStyle(fontSize: 12, color: Colors.grey)),
                      ],
                    ),
                  )),
                  const SizedBox(height: 8),
                  const Text('هل تريد الاستمرار بالاعتماد؟', style: TextStyle(fontWeight: FontWeight.w600)),
                ],
              ),
              actions: [
                TextButton(
                  onPressed: () => Get.back(result: false),
                  child: const Text('إلغاء'),
                ),
                ElevatedButton(
                  onPressed: () => Get.back(result: true),
                  style: ElevatedButton.styleFrom(backgroundColor: Colors.orange),
                  child: const Text('اعتماد رغم التكرار', style: TextStyle(color: Colors.white)),
                ),
              ],
            ),
          );

          if (proceed != true) return;
        }
      }
    } catch (e) {
      // If duplicate check fails, proceed with approval anyway
      AppLogger.error('Duplicate check failed (proceeding)', e);
    }

    // Proceed with approval
    try {
      final res = await DioClient()
          .client
          .post('invoices/approve', data: {'id': invoiceId});
      if (res.data['success'] == true) {
        AppSnackbar.showSuccess('تم الاعتماد', 'تم اعتماد الفاتورة بنجاح');
        fetchInvoiceDetails();
      } else {
        AppSnackbar.showError('خطأ', 'فشل اعتماد الفاتورة');
      }
    } catch (e) {
      AppLogger.error('Failed to approve invoice', e);
      AppSnackbar.showError('خطأ', 'حدث خطأ غير متوقع');
    }
  }

  void viewOriginalImage() {
    final fileUrl = invoice['file_url'];
    if (fileUrl != null && fileUrl.isNotEmpty) {
      final fullUrl = 'https://musadaq.intaleqapp.com/api$fileUrl';
      Get.to(() => Scaffold(
            appBar: AppBar(
                title: const Text('صورة الفاتورة'),
                backgroundColor: const Color(0xFF0F4C81)),
            body: Center(
              child: InteractiveViewer(
                child: Image.network(
                  fullUrl,
                  loadingBuilder: (context, child, loadingProgress) {
                    if (loadingProgress == null) return child;
                    return const CircularProgressIndicator();
                  },
                  errorBuilder: (context, error, stackTrace) {
                    return const Text(
                        'فشل تحميل الصورة. قد يكون الملف مفقوداً على الخادم.');
                  },
                ),
              ),
            ),
          ));
    } else {
      AppSnackbar.showWarning('عذراً', 'لا توجد صورة مرتبطة بهذه الفاتورة');
    }
  }

  Future<void> exportInvoices({String? companyId}) async {
    try {
      final cId = companyId ?? invoice['company_id'];
      AppSnackbar.showInfo('جاري التصدير', 'يتم تحميل ملف الفواتير...');
      
      final res = await DioClient().client.get(
        'invoices/export',
        queryParameters: {'company_id': cId},
        options: Options(responseType: ResponseType.bytes),
      );

      // Save to temp file
      final dir = await getTemporaryDirectory();
      final fileName = 'musadaq_invoices_${DateTime.now().millisecondsSinceEpoch}.csv';
      final file = File('${dir.path}/$fileName');
      final bytes = List<int>.from(res.data);
      await file.writeAsBytes(bytes);

      // Share via native sheet (share_plus v12 API)
      try {
        await SharePlus.instance.share(
          ShareParams(
            files: [XFile(file.path, mimeType: 'text/csv', name: fileName)],
            title: 'تصدير فواتير مُصادَق',
          ),
        );
      } catch (shareErr) {
        AppLogger.error('Share fallback', shareErr);
        AppSnackbar.showSuccess('تم الحفظ', 'تم حفظ الملف: ${file.path}');
      }
    } catch (e) {
      AppLogger.error('Failed to export', e);
      AppSnackbar.showError('خطأ', 'فشل تصدير الفواتير: $e');
    }
  }

  Future<void> submitToJoFotara() async {
    final confirmed = await Get.dialog<bool>(
      AlertDialog(
        title: const Text('تأكيد الإرسال'),
        content: const Text(
            'هل أنت متأكد من إرسال هذه الفاتورة لمنظومة جوفوترا؟\nلا يمكن التراجع عن هذا الإجراء.'),
        actions: [
          TextButton(
            onPressed: () => Get.back(result: false),
            child: const Text('إلغاء'),
          ),
          ElevatedButton(
            onPressed: () => Get.back(result: true),
            style: ElevatedButton.styleFrom(
              backgroundColor: const Color(0xFF6366F1),
            ),
            child: const Text('إرسال', style: TextStyle(color: Colors.white)),
          ),
        ],
      ),
    );

    if (confirmed != true) return;

    try {
      AppSnackbar.showInfo('جاري الإرسال', 'يتم إرسال الفاتورة لمنظومة جوفوترا...');
      final res = await DioClient().client.post(
        'invoices/submit-jofotara',
        data: {'invoice_id': invoiceId},
      );

      if (res.data['success'] == true) {
        AppSnackbar.showSuccess('تم الإرسال', 'تم تقديم الفاتورة لجوفوترا بنجاح');
        fetchInvoiceDetails();
      } else {
        AppSnackbar.showError('خطأ', res.data['message'] ?? 'فشل الإرسال');
      }
    } catch (e) {
      AppLogger.error('Failed to submit to JoFotara', e);
      AppSnackbar.showError('خطأ', 'فشل إرسال الفاتورة لجوفوترا');
    }
  }
}