import 'dart:io';
import 'dart:convert';
import 'package:get/get.dart';
import 'package:file_picker/file_picker.dart';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:mime/mime.dart';

import 'package:marco/helpers/services/api_service.dart';
import 'package:marco/helpers/services/app_logger.dart';
import 'package:marco/helpers/widgets/my_snackbar.dart';
import 'package:marco/helpers/widgets/time_stamp_image_helper.dart';
import 'package:marco/model/finance/expense_category_model.dart';
import 'package:marco/model/finance/currency_list_model.dart';

class PaymentRequestController extends GetxController {
  // ─────────────────────────────────────────────
  // 🔹 Loading States
  // ─────────────────────────────────────────────
  final isLoadingPayees = false.obs;
  final isLoadingCategories = false.obs;
  final isLoadingCurrencies = false.obs;
  final isProcessingAttachment = false.obs;

  // ─────────────────────────────────────────────
  // 🔹 Data Lists
  // ─────────────────────────────────────────────
  final payees = <String>[].obs;
  final categories = <ExpenseCategory>[].obs;
  final currencies = <Currency>[].obs;
  final globalProjects = <String>[].obs;

  // ─────────────────────────────────────────────
  // 🔹 Selected Values
  // ─────────────────────────────────────────────
  final selectedCategory = Rx<ExpenseCategory?>(null);
  final selectedPayee = ''.obs;
  final selectedCurrency = Rx<Currency?>(null);
  final selectedProject = ''.obs;
  final isAdvancePayment = false.obs;

  // ─────────────────────────────────────────────
  // 🔹 Text Controllers
  // ─────────────────────────────────────────────
  final titleController = TextEditingController();
  final dueDateController = TextEditingController();
  final amountController = TextEditingController();
  final descriptionController = TextEditingController();

  // ─────────────────────────────────────────────
  // 🔹 Attachments
  // ─────────────────────────────────────────────
  final attachments = <File>[].obs;
  final existingAttachments = <Map<String, dynamic>>[].obs;
  final ImagePicker _picker = ImagePicker();

  // ─────────────────────────────────────────────
  // 🔹 Lifecycle
  // ─────────────────────────────────────────────
  @override
  void onInit() {
    super.onInit();
    fetchAllMasterData();
    fetchGlobalProjects();
  }

  @override
  void onClose() {
    titleController.dispose();
    dueDateController.dispose();
    amountController.dispose();
    descriptionController.dispose();
    super.onClose();
  }

  // ─────────────────────────────────────────────
  // 🔹 Master Data Fetch
  // ─────────────────────────────────────────────
  Future<void> fetchAllMasterData() async {
    await Future.wait([
      fetchPayees(),
      fetchExpenseCategories(),
      fetchCurrencies(),
    ]);
  }

  Future<void> fetchPayees() async {
    try {
      isLoadingPayees.value = true;
      final response = await ApiService.getExpensePaymentRequestPayeeApi();
      if (response != null && response.data.isNotEmpty) {
        payees.value = response.data;
      } else {
        payees.clear();
      }
    } catch (e) {
      logSafe("Error fetching payees: $e", level: LogLevel.error);
    } finally {
      isLoadingPayees.value = false;
    }
  }

  Future<void> fetchExpenseCategories() async {
    try {
      isLoadingCategories.value = true;
      final response = await ApiService.getMasterExpenseCategoriesApi();
      if (response != null && response.data.isNotEmpty) {
        categories.value = response.data;
      } else {
        categories.clear();
      }
    } catch (e) {
      logSafe("Error fetching categories: $e", level: LogLevel.error);
    } finally {
      isLoadingCategories.value = false;
    }
  }

  Future<void> fetchCurrencies() async {
    try {
      isLoadingCurrencies.value = true;
      final response = await ApiService.getMasterCurrenciesApi();
      if (response != null && response.data.isNotEmpty) {
        currencies.value = response.data;
      } else {
        currencies.clear();
      }
    } catch (e) {
      logSafe("Error fetching currencies: $e", level: LogLevel.error);
    } finally {
      isLoadingCurrencies.value = false;
    }
  }

  Future<void> fetchGlobalProjects() async {
    try {
      final response = await ApiService.getGlobalProjects();
      if (response != null && response.isNotEmpty) {
        globalProjects.value = response
            .map<String>((e) => e['name']?.toString().trim() ?? '')
            .where((name) => name.isNotEmpty)
            .toList();
      } else {
        globalProjects.clear();
      }
    } catch (e) {
      logSafe("Error fetching projects: $e", level: LogLevel.error);
      globalProjects.clear();
    }
  }

  // ─────────────────────────────────────────────
  // 🔹 File / Image Pickers
  // ─────────────────────────────────────────────

  /// 📂 Pick **any type of attachment** (no extension restriction)
  Future<void> pickAttachments() async {
    try {
      final result = await FilePicker.platform.pickFiles(
        type: FileType.any, // ✅ No restriction on type
        allowMultiple: true,
      );
      if (result != null && result.paths.isNotEmpty) {
        attachments.addAll(result.paths.whereType<String>().map(File.new));
      }
    } catch (e) {
      _errorSnackbar("Attachment error: $e");
    }
  }

  /// 📸 Pick from camera and auto add timestamp
  Future<void> pickFromCamera() async {
    try {
      final pickedFile = await _picker.pickImage(source: ImageSource.camera);
      if (pickedFile != null) {
        isProcessingAttachment.value = true;
        File imageFile = File(pickedFile.path);
        File timestampedFile =
            await TimestampImageHelper.addTimestamp(imageFile: imageFile);
        attachments.add(timestampedFile);
        attachments.refresh();
      }
    } catch (e) {
      _errorSnackbar("Camera error: $e");
    } finally {
      isProcessingAttachment.value = false;
    }
  }

  /// 🖼️ Pick from gallery
  Future<void> pickFromGallery() async {
    try {
      final pickedFile = await _picker.pickImage(source: ImageSource.gallery);
      if (pickedFile != null) {
        attachments.add(File(pickedFile.path));
        attachments.refresh();
      }
    } catch (e) {
      _errorSnackbar("Gallery error: $e");
    }
  }

  // ─────────────────────────────────────────────
  // 🔹 Value Selectors
  // ─────────────────────────────────────────────
  void selectProject(String project) => selectedProject.value = project;
  void selectCategory(ExpenseCategory category) =>
      selectedCategory.value = category;
  void selectPayee(String payee) => selectedPayee.value = payee;
  void selectCurrency(Currency currency) => selectedCurrency.value = currency;

  // ─────────────────────────────────────────────
  // 🔹 Attachment Helpers
  // ─────────────────────────────────────────────
  void addAttachment(File file) => attachments.add(file);
  void removeAttachment(File file) => attachments.remove(file);
  void removeExistingAttachment(Map<String, dynamic> file) =>
      existingAttachments.remove(file);

  // ─────────────────────────────────────────────
  // 🔹 Payload Builder (for upload)
  // ─────────────────────────────────────────────
  Future<List<Map<String, dynamic>>> buildAttachmentPayload() async {
    final existingPayload = existingAttachments
        .map((e) => {
              "documentId": e['documentId'],
              "fileName": e['fileName'],
              "contentType": e['contentType'] ?? 'application/octet-stream',
              "fileSize": e['fileSize'] ?? 0,
              "description": "",
              "url": e['url'],
              "isActive": e['isActive'] ?? true,
              "base64Data": "",
            })
        .toList();

    final newPayload = await Future.wait(
      attachments.map((file) async {
        final bytes = await file.readAsBytes();
        return {
          "fileName": file.path.split('/').last,
          "base64Data": base64Encode(bytes),
          "contentType":
              lookupMimeType(file.path) ?? 'application/octet-stream',
          "fileSize": await file.length(),
          "description": "",
        };
      }),
    );

    return [...existingPayload, ...newPayload];
  }

  // ─────────────────────────────────────────────
  // 🔹 Snackbar Helper
  // ─────────────────────────────────────────────
  void _errorSnackbar(String msg, [String title = "Error"]) {
    showAppSnackbar(title: title, message: msg, type: SnackbarType.error);
  }
}