import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:marco/controller/project_controller.dart';
import 'package:marco/controller/expense/expense_screen_controller.dart';
import 'package:marco/controller/permission_controller.dart';
import 'package:marco/helpers/widgets/my_text.dart';
import 'package:marco/helpers/widgets/my_custom_skeleton.dart';
import 'package:marco/model/expense/expense_list_model.dart';
import 'package:marco/model/expense/add_expense_bottom_sheet.dart';
import 'package:marco/view/expense/expense_filter_bottom_sheet.dart';
import 'package:marco/helpers/widgets/expense_main_components.dart';
import 'package:marco/helpers/utils/permission_constants.dart';
import 'package:marco/helpers/widgets/my_refresh_indicator.dart';


class ExpenseMainScreen extends StatefulWidget {
  const ExpenseMainScreen({super.key});

  @override
  State<ExpenseMainScreen> createState() => _ExpenseMainScreenState();
}

class _ExpenseMainScreenState extends State<ExpenseMainScreen> {
  bool isHistoryView = false;
  final searchController = TextEditingController();
  final expenseController = Get.put(ExpenseController());
  final projectController = Get.find<ProjectController>();
  final permissionController = Get.find<PermissionController>();

  @override
  void initState() {
    super.initState();
    expenseController.fetchExpenses();
  }

  Future<void> _refreshExpenses() async {
    await expenseController.fetchExpenses();
  }

  void _openFilterBottomSheet() {
    showModalBottomSheet(
      context: context,
      isScrollControlled: true,
      backgroundColor: Colors.transparent,
      builder: (_) => ExpenseFilterBottomSheet(
        expenseController: expenseController,
        scrollController: ScrollController(),
      ),
    );
  }

  List<ExpenseModel> _getFilteredExpenses() {
    final query = searchController.text.trim().toLowerCase();
    final now = DateTime.now();

    final filtered = expenseController.expenses.where((e) {
      return query.isEmpty ||
          e.expensesType.name.toLowerCase().contains(query) ||
          e.supplerName.toLowerCase().contains(query) ||
          e.paymentMode.name.toLowerCase().contains(query);
    }).toList()
      ..sort((a, b) => b.transactionDate.compareTo(a.transactionDate));

    return isHistoryView
        ? filtered
            .where((e) =>
                e.transactionDate.isBefore(DateTime(now.year, now.month)))
            .toList()
        : filtered
            .where((e) =>
                e.transactionDate.month == now.month &&
                e.transactionDate.year == now.year)
            .toList();
  }
  
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.white,
      appBar: ExpenseAppBar(projectController: projectController),
      body: SafeArea(
        child: Column(
          children: [
            SearchAndFilter(
              controller: searchController,
              onChanged: (_) => setState(() {}),
              onFilterTap: _openFilterBottomSheet,
              expenseController: expenseController,
            ),
            ToggleButtonsRow(
              isHistoryView: isHistoryView,
              onToggle: (v) => setState(() => isHistoryView = v),
            ),
            Expanded(
              child: Obx(() {
                // Loader while fetching first time
                if (expenseController.isLoading.value &&
                    expenseController.expenses.isEmpty) {
                  return SkeletonLoaders.expenseListSkeletonLoader();
                }

                final filteredList = _getFilteredExpenses();

                return MyRefreshIndicator(
                  onRefresh: _refreshExpenses,
                  child: filteredList.isEmpty
                      ? ListView(
                          physics:
                              const AlwaysScrollableScrollPhysics(), 
                          children: [
                            SizedBox(
                              height: MediaQuery.of(context).size.height * 0.5,
                              child: Center(
                                child: MyText.bodyMedium(
                                  expenseController.errorMessage.isNotEmpty
                                      ? expenseController.errorMessage.value
                                      : "No expenses found",
                                  color:
                                      expenseController.errorMessage.isNotEmpty
                                          ? Colors.red
                                          : Colors.grey,
                                ),
                              ),
                            ),
                          ],
                        )
                      : NotificationListener<ScrollNotification>(
                          onNotification: (scrollInfo) {
                            if (scrollInfo.metrics.pixels ==
                                    scrollInfo.metrics.maxScrollExtent &&
                                !expenseController.isLoading.value) {
                              expenseController.loadMoreExpenses();
                            }
                            return false;
                          },
                          child: ExpenseList(
                            expenseList: filteredList,
                            onViewDetail: () =>
                                expenseController.fetchExpenses(),
                          ),
                        ),
                );
              }),
            )
          ],
        ),
      ),

      // ✅ FAB only if user has expenseUpload permission
      floatingActionButton:
          permissionController.hasPermission(Permissions.expenseUpload)
              ? FloatingActionButton(
                  backgroundColor: Colors.red,
                  onPressed: showAddExpenseBottomSheet,
                  child: const Icon(Icons.add, color: Colors.white),
                )
              : null,
    );
  }
}