import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:marco/helpers/services/api_service.dart';
import 'package:marco/model/document/document_filter_model.dart';
import 'package:marco/model/document/documents_list_model.dart';

class DocumentController extends GetxController {
  // ==================== Observables ====================
  final isLoading = false.obs;
  final documents = <DocumentItem>[].obs;
  final filters = Rxn<DocumentFiltersData>();

  // Selected filters (multi-select)
  final selectedUploadedBy = <String>[].obs;
  final selectedCategory = <String>[].obs;
  final selectedType = <String>[].obs;
  final selectedTag = <String>[].obs;

  // Pagination
  final pageNumber = 1.obs;
  final pageSize = 20;
  final hasMore = true.obs;

  // Error handling
  final errorMessage = ''.obs;

  // Preferences
  final showInactive = false.obs;

  // Search
  final searchQuery = ''.obs;
  final searchController = TextEditingController();

  // Additional filters
  final isUploadedAt = true.obs;
  final isVerified = RxnBool();
  final startDate = Rxn<DateTime>();
  final endDate = Rxn<DateTime>();

  // ==================== Lifecycle ====================

  @override
  void onClose() {
    // Don't dispose searchController here - it's managed by the page
    super.onClose();
  }

  // ==================== API Methods ====================

  /// Fetch document filters for entity
  Future<void> fetchFilters(String entityTypeId) async {
    try {
      final response = await ApiService.getDocumentFilters(entityTypeId);

      if (response != null && response.success) {
        filters.value = response.data;
      } else {
        errorMessage.value = response?.message ?? 'Failed to fetch filters';
        _showError('Failed to load filters');
      }
    } catch (e) {
      errorMessage.value = 'Error fetching filters: $e';
      _showError('Error loading filters');
      debugPrint('❌ Error fetching filters: $e');
    }
  }

  /// Toggle document active/inactive state
  Future<bool> toggleDocumentActive(
    String id, {
    required bool isActive,
    required String entityTypeId,
    required String entityId,
  }) async {
    try {
      isLoading.value = true;

      final success = await ApiService.deleteDocumentApi(
        id: id,
        isActive: isActive,
      );

      if (success) {
        // Refresh list after state change
        await fetchDocuments(
          entityTypeId: entityTypeId,
          entityId: entityId,
          reset: true,
        );
        return true;
      } else {
        errorMessage.value = 'Failed to update document state';
        return false;
      }
    } catch (e) {
      errorMessage.value = 'Error updating document: $e';
      debugPrint('❌ Error toggling document state: $e');
      return false;
    } finally {
      isLoading.value = false;
    }
  }

  /// Fetch documents for entity with pagination
  Future<void> fetchDocuments({
    required String entityTypeId,
    required String entityId,
    String? filter,
    String? searchString,
    bool reset = false,
  }) async {
    try {
      // Reset pagination if needed
      if (reset) {
        pageNumber.value = 1;
        documents.clear();
        hasMore.value = true;
      }

      // Don't fetch if no more data
      if (!hasMore.value && !reset) return;

      // Prevent duplicate requests
      if (isLoading.value) return;

      isLoading.value = true;

      final response = await ApiService.getDocumentListApi(
        entityTypeId: entityTypeId,
        entityId: entityId,
        filter: filter ?? '',
        searchString: searchString ?? searchQuery.value,
        pageNumber: pageNumber.value,
        pageSize: pageSize,
        isActive: !showInactive.value,
      );

      if (response != null && response.success) {
        if (response.data.data.isNotEmpty) {
          documents.addAll(response.data.data);
          pageNumber.value++;
        } else {
          hasMore.value = false;
        }
        errorMessage.value = '';
      } else {
        errorMessage.value = response?.message ?? 'Failed to fetch documents';
        if (documents.isEmpty) {
          _showError('Failed to load documents');
        }
      }
    } catch (e) {
      errorMessage.value = 'Error fetching documents: $e';
      if (documents.isEmpty) {
        _showError('Error loading documents');
      }
      debugPrint('❌ Error fetching documents: $e');
    } finally {
      isLoading.value = false;
    }
  }

  // ==================== Helper Methods ====================

  /// Clear all selected filters
  void clearFilters() {
    selectedUploadedBy.clear();
    selectedCategory.clear();
    selectedType.clear();
    selectedTag.clear();
    isUploadedAt.value = true;
    isVerified.value = null;
    startDate.value = null;
    endDate.value = null;
  }

  /// Check if any filters are active
  bool hasActiveFilters() {
    return selectedUploadedBy.isNotEmpty ||
        selectedCategory.isNotEmpty ||
        selectedType.isNotEmpty ||
        selectedTag.isNotEmpty ||
        startDate.value != null ||
        endDate.value != null ||
        isVerified.value != null;
  }

  /// Show error message
  void _showError(String message) {
    Get.snackbar(
      'Error',
      message,
      snackPosition: SnackPosition.BOTTOM,
      backgroundColor: Colors.red.shade100,
      colorText: Colors.red.shade900,
      margin: const EdgeInsets.all(16),
      borderRadius: 8,
      duration: const Duration(seconds: 3),
    );
  }

  /// Reset controller state
  void reset() {
    documents.clear();
    clearFilters();
    searchController.clear();
    searchQuery.value = '';
    pageNumber.value = 1;
    hasMore.value = true;
    showInactive.value = false;
    errorMessage.value = '';
  }
}