import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:rluv/features/budget/widgets/transaction_list_item.dart';
import 'package:rluv/global/styles.dart';
import 'package:rluv/models/transaction_model.dart';

import '../../../global/store.dart';
import '../../../models/budget_category_model.dart';

class TransactionsListview extends ConsumerStatefulWidget {
  const TransactionsListview({super.key});

  @override
  ConsumerState<TransactionsListview> createState() => _TransactionsListviewState();
}

class _TransactionsListviewState extends ConsumerState<TransactionsListview> {
  final scaffoldKey = GlobalKey<ScaffoldState>();

  @override
  void initState() {
    // TODO: implement initState
    WidgetsBinding.instance.addPostFrameCallback((_) {
      ref.read(selectedTransactionSortProvider.notifier).state = TransactionSort.all;
      ref.read(selectedSortDateProvider.notifier).state = SortDate.decending;
    });
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    final budgetCategories = ref.watch(budgetCategoriesProvider);
    if (ref.read(selectedCategory) == null && budgetCategories.isNotEmpty) {
      WidgetsBinding.instance
          .addPostFrameCallback((_) => ref.read(selectedCategory.notifier).state = budgetCategories.first);
    }
    final sortType = ref.watch(selectedTransactionSortProvider);
    final sortDate = ref.watch(selectedSortDateProvider);
    List<Transaction> transactions = [...ref.watch(transactionsProvider)];
    // Removes transactions by category
    switch (sortType) {
      case TransactionSort.income:
        transactions = transactions
            .where(
              (element) => element.type == TransactionType.income,
            )
            .toList();
        break;
      case TransactionSort.expense:
        transactions = transactions
            .where(
              (element) => element.type == TransactionType.expense,
            )
            .toList();
        break;
      case TransactionSort.category:
        if (ref.read(selectedCategory) != null) {
          transactions = transactions
              .where(
                (element) => element.budgetCategoryId == ref.read(selectedCategory)!.id,
              )
              .toList();
        }
        break;
      case TransactionSort.all:
        break;
    }
    // Sorts transactions by date
    switch (sortDate) {
      case SortDate.ascending:
        transactions.sort((a, b) => a.date.compareTo(b.date));
        break;
      case SortDate.decending:
        transactions.sort((a, b) => b.date.compareTo(a.date));
        break;
    }

    WidgetsBinding.instance
        .addPostFrameCallback((_) => ref.read(transactionHistoryListProvider.notifier).state = transactions);
    return Scaffold(
      endDrawer: Drawer(
        backgroundColor: Styles.purpleNurple,
        child: SafeArea(
          child: Column(
            children: [
              SizedBox(height: MediaQuery.of(context).size.height * 0.15),
              DropdownButton<TransactionSort>(
                  dropdownColor: Styles.lavender,
                  value: ref.watch(selectedTransactionSortProvider),
                  items: TransactionSort.values
                      .map(
                        (e) => DropdownMenuItem(
                          value: e,
                          child: Row(
                            mainAxisSize: MainAxisSize.min,
                            children: [
                              sortTypeToIcon(e),
                              const SizedBox(width: 12),
                              Text(e.name),
                            ],
                          ),
                        ),
                      )
                      .toList(),
                  onChanged: (TransactionSort? value) {
                    if (value != null) {
                      ref.read(selectedTransactionSortProvider.notifier).state = value;
                    }
                  }),
              const SizedBox(height: 20),
              DropdownButton<SortDate>(
                  dropdownColor: Styles.lavender,
                  value: ref.watch(selectedSortDateProvider),
                  items: SortDate.values
                      .map(
                        (e) => DropdownMenuItem(
                          value: e,
                          child: Row(
                            mainAxisSize: MainAxisSize.min,
                            children: [
                              sortDateToIcon(e),
                              const SizedBox(width: 12),
                              Text(e.name),
                            ],
                          ),
                        ),
                      )
                      .toList(),
                  onChanged: (SortDate? value) {
                    if (value != null) {
                      ref.read(selectedSortDateProvider.notifier).state = value;
                    }
                  }),
              const SizedBox(height: 20),
              if (ref.read(selectedTransactionSortProvider) == TransactionSort.category)
                DropdownButton<BudgetCategory>(
                  dropdownColor: Styles.lavender,
                  value: ref.watch(selectedCategory),
                  items: budgetCategories
                      .map(
                        (e) => DropdownMenuItem(
                          value: e,
                          child: Row(
                            mainAxisSize: MainAxisSize.min,
                            children: [
                              Container(
                                height: 18,
                                width: 18,
                                decoration: BoxDecoration(
                                  shape: BoxShape.circle,
                                  border: Border.all(color: Colors.black, width: 1.5),
                                  color: e.color,
                                ),
                              ),
                              const SizedBox(width: 12),
                              Text(e.name),
                            ],
                          ),
                        ),
                      )
                      .toList(),
                  onChanged: (BudgetCategory? value) {
                    if (value != null) {
                      ref.read(selectedCategory.notifier).state = value;
                    }
                  },
                ),
            ],
          ),
        ),
      ),
      key: scaffoldKey,
      backgroundColor: Styles.purpleNurple,
      body: SafeArea(
        child: Stack(
          children: [
            if (transactions.isEmpty) ...[
              Align(
                alignment: Alignment.topLeft,
                child: Padding(
                  padding: const EdgeInsets.only(left: 8.0, top: 16.0),
                  child: IconButton(icon: const Icon(Icons.chevron_left), onPressed: () => Navigator.pop(context)),
                ),
              ),
              const Center(
                child: Text('No transactions'),
              ),
            ],
            if (transactions.isNotEmpty)
              Column(
                children: [
                  Row(mainAxisAlignment: MainAxisAlignment.center, children: [
                    Padding(
                      padding: const EdgeInsets.only(left: 8.0, top: 16.0),
                      child: IconButton(icon: const Icon(Icons.chevron_left), onPressed: () => Navigator.pop(context)),
                    ),
                    const Spacer(),
                    const Padding(
                      padding: EdgeInsets.symmetric(vertical: 18.0, horizontal: 0.0),
                      child: Text(
                        'Transaction History',
                        style: TextStyle(fontSize: 28),
                        textAlign: TextAlign.center,
                      ),
                    ),
                    const Spacer(),
                    Padding(
                      padding: const EdgeInsets.only(left: 8.0, top: 16.0),
                      child: IconButton(
                          icon: const Icon(Icons.sort),
                          onPressed: () {
                            toggleDrawer();
                          }),
                    ),
                  ]),
                  Expanded(
                    child: ListView.builder(
                      physics: const BouncingScrollPhysics(),
                      itemCount: transactions.length,
                      itemBuilder: (BuildContext context, int index) {
                        return TransactionListItem(
                          index: index,
                        );
                      },
                    ),
                  ),
                ],
              ),
          ],
        ),
      ),
    );
  }

  void toggleDrawer() {
    if (scaffoldKey.currentState != null && scaffoldKey.currentState!.isDrawerOpen) {
      scaffoldKey.currentState!.openDrawer();
    } else if (scaffoldKey.currentState != null) {
      scaffoldKey.currentState!.openEndDrawer();
    }
  }
}

enum TransactionSort {
  all,
  income,
  expense,
  category,
}

enum SortDate {
  decending,
  ascending,
}

Icon sortTypeToIcon(TransactionSort s) {
  switch (s) {
    case TransactionSort.all:
      return const Icon(Icons.donut_large);
    case TransactionSort.income:
      return const Icon(Icons.attach_money);
    case TransactionSort.expense:
      return const Icon(Icons.shopping_bag);
    case TransactionSort.category:
      return const Icon(Icons.sort);
  }
}

Icon sortDateToIcon(SortDate s) {
  switch (s) {
    case SortDate.ascending:
      return const Icon(Icons.arrow_circle_up);
    case SortDate.decending:
      return const Icon(Icons.arrow_circle_down);
  }
}

final selectedTransactionSortProvider = StateProvider<TransactionSort>(
  (ref) => TransactionSort.all,
);

final selectedSortDateProvider = StateProvider<SortDate>((ref) => SortDate.decending);

final transactionHistoryListProvider = StateProvider<List<Transaction>>(
  (ref) => [],
);

final selectedCategory = StateProvider<BudgetCategory?>((ref) => null);