import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:go_router/go_router.dart';
import 'package:paperless_api/paperless_api.dart';
import 'package:paperless_mobile/features/app_drawer/view/app_drawer.dart';
import 'package:paperless_mobile/features/inbox/cubit/inbox_cubit.dart';
import 'package:paperless_mobile/generated/l10n/app_localizations.dart';

const _landingPage = 0;
const _documentsIndex = 1;
const _scannerIndex = 2;
const _labelsIndex = 3;
const _inboxIndex = 4;

class ScaffoldWithNavigationBar extends StatefulWidget {
  final UserModel authenticatedUser;
  final StatefulNavigationShell navigationShell;
  const ScaffoldWithNavigationBar({
    super.key,
    required this.authenticatedUser,
    required this.navigationShell,
  });

  @override
  State<ScaffoldWithNavigationBar> createState() =>
      ScaffoldWithNavigationBarState();
}

class ScaffoldWithNavigationBarState extends State<ScaffoldWithNavigationBar> {
  @override
  Widget build(BuildContext context) {
    final primaryColor = Theme.of(context).colorScheme.primary;

    return Scaffold(
      drawer: const AppDrawer(),
      bottomNavigationBar: NavigationBar(
        selectedIndex: widget.navigationShell.currentIndex,
        onDestinationSelected: (index) {
          widget.navigationShell.goBranch(
            index,
            initialLocation: index == widget.navigationShell.currentIndex,
          );
        },
        destinations: [
          NavigationDestination(
            icon: const Icon(Icons.home_outlined),
            selectedIcon: Icon(
              Icons.home,
              color: primaryColor,
            ),
            label: "Home", //TODO: INTL
          ),
          _toggleDestination(
            NavigationDestination(
              icon: const Icon(Icons.description_outlined),
              selectedIcon: Icon(
                Icons.description,
                color: primaryColor,
              ),
              label: S.of(context)!.documents,
            ),
            disableWhen: !widget.authenticatedUser.canViewDocuments,
          ),
          _toggleDestination(
            NavigationDestination(
              icon: const Icon(Icons.document_scanner_outlined),
              selectedIcon: Icon(
                Icons.document_scanner,
                color: primaryColor,
              ),
              label: S.of(context)!.scanner,
            ),
            disableWhen: !widget.authenticatedUser.canCreateDocuments,
          ),
          _toggleDestination(
            NavigationDestination(
              icon: const Icon(Icons.sell_outlined),
              selectedIcon: Icon(
                Icons.sell,
                color: primaryColor,
              ),
              label: S.of(context)!.labels,
            ),
            disableWhen: !widget.authenticatedUser.canViewAnyLabel,
          ),
          _toggleDestination(
            NavigationDestination(
              icon: Builder(
                builder: (context) {
                  return BlocBuilder<InboxCubit, InboxState>(
                    builder: (context, state) {
                      return Badge.count(
                        isLabelVisible: state.itemsInInboxCount > 0,
                        count: state.itemsInInboxCount,
                        child: const Icon(Icons.inbox_outlined),
                      );
                    },
                  );
                },
              ),
              selectedIcon: BlocBuilder<InboxCubit, InboxState>(
                builder: (context, state) {
                  return Badge.count(
                    isLabelVisible: state.itemsInInboxCount > 0 &&
                        widget.authenticatedUser.canViewInbox,
                    count: state.itemsInInboxCount,
                    child: Icon(
                      Icons.inbox,
                      color: primaryColor,
                    ),
                  );
                },
              ),
              label: S.of(context)!.inbox,
            ),
            disableWhen: !widget.authenticatedUser.canViewInbox,
          ),
        ],
      ),
      body: widget.navigationShell,
    );
  }

  Widget _toggleDestination(
    Widget destination, {
    required bool disableWhen,
  }) {
    final disabledColor = Theme.of(context).disabledColor;

    final disabledTheme = Theme.of(context).navigationBarTheme.copyWith(
          labelTextStyle: MaterialStatePropertyAll(
            Theme.of(context)
                .textTheme
                .labelSmall
                ?.copyWith(color: disabledColor),
          ),
          iconTheme: MaterialStatePropertyAll(
            Theme.of(context).iconTheme.copyWith(color: disabledColor),
          ),
        );
    if (disableWhen) {
      return AbsorbPointer(
        child: Theme(
          data: Theme.of(context).copyWith(navigationBarTheme: disabledTheme),
          child: destination,
        ),
      );
    }
    return destination;
  }
}