game-tracker/lib/presentation/views/main_menu/custom_navigation_bar.dart

import 'dart:ui';

import 'package:flutter/material.dart';
import 'package:game_tracker/core/adaptive_page_route.dart';
import 'package:game_tracker/core/custom_theme.dart';
import 'package:game_tracker/l10n/generated/app_localizations.dart';
import 'package:game_tracker/presentation/views/main_menu/group_view/groups_view.dart';
import 'package:game_tracker/presentation/views/main_menu/home_view.dart';
import 'package:game_tracker/presentation/views/main_menu/match_view/match_view.dart';
import 'package:game_tracker/presentation/views/main_menu/settings_view.dart';
import 'package:game_tracker/presentation/views/main_menu/statistics_view.dart';
import 'package:game_tracker/presentation/widgets/navbar_item.dart';

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

  @override
  State<CustomNavigationBar> createState() => _CustomNavigationBarState();
}

class _CustomNavigationBarState extends State<CustomNavigationBar>
    with SingleTickerProviderStateMixin {
  /// Currently selected tab index
  int currentIndex = 0;

  /// Key count to force rebuild of tab views
  int tabKeyCount = 0;

  @override
  Widget build(BuildContext context) {
    final loc = AppLocalizations.of(context);
    // Pretty ugly but works
    final List<Widget> tabs = [
      KeyedSubtree(key: ValueKey('home_$tabKeyCount'), child: const HomeView()),
      KeyedSubtree(
        key: ValueKey('matches_$tabKeyCount'),
        child: const MatchView(),
      ),
      KeyedSubtree(
        key: ValueKey('groups_$tabKeyCount'),
        child: const GroupsView(),
      ),
      KeyedSubtree(
        key: ValueKey('stats_$tabKeyCount'),
        child: const StatisticsView(),
      ),
    ];
    return Scaffold(
      appBar: AppBar(
        centerTitle: true,
        title: Text(
          _currentTabTitle(context),
          style: const TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
        ),
        backgroundColor: CustomTheme.backgroundColor,
        scrolledUnderElevation: 0,
        actions: [
          IconButton(
            onPressed: () async {
              await Navigator.push(
                context,
                adaptivePageRoute(builder: (_) => const SettingsView()),
              );
              setState(() {
                tabKeyCount++;
              });
            },
            icon: const Icon(Icons.settings),
          ),
        ],
        elevation: 0,
      ),
      backgroundColor: CustomTheme.backgroundColor,
      body: tabs[currentIndex],
      extendBody: true,
      bottomNavigationBar: SizedBox(
        height: 70 + MediaQuery.of(context).padding.bottom,
        child: Stack(
          children: [
            // Dynamisch generierte Blur-Layer für ultra-smooth Übergang
            ...List.generate(35, (index) {
              // Verwende kubische Kurve für noch natürlicheren, weicheren Übergang
              final progress = index / 34.0; // 0.0 bis 1.0
              final cubic = progress * progress * progress; // Kubische Kurve
              final blurStrength = 0.5 + (cubic * 50.0); // Sehr sanft von 0.5 bis 50.5

              // Höhe geht jetzt komplett von 100% bis 0% (ganz nach unten)
              // Mit extra Dichte am unteren Ende für weicheren Übergang
              final heightFactor = index < 25
                  ? 1.0 - (progress * 0.7)  // Erste 25 Layer: 100% bis 30%
                  : 0.3 - ((index - 25) / 34.0); // Letzte 10 Layer: 30% bis 0% (dichter)

              return Positioned(
                left: 0,
                right: 0,
                bottom: 0,
                height: (70 + MediaQuery.of(context).padding.bottom) * heightFactor.clamp(0.05, 1.0),
                child: ClipRect(
                  child: BackdropFilter(
                    filter: ImageFilter.blur(
                      sigmaX: blurStrength,
                      sigmaY: blurStrength,
                    ),
                    child: Container(
                      color: Colors.transparent,
                    ),
                  ),
                ),
              );
            }),
            // Gradient-Overlay
            Positioned.fill(
              child: Container(
                decoration: BoxDecoration(
                  gradient: LinearGradient(
                    begin: Alignment.bottomCenter,
                    end: Alignment.topCenter,
                    colors: [
                      CustomTheme.boxColor.withValues(alpha: 1),
                      CustomTheme.boxColor.withValues(alpha: 0.0),
                    ],
                    stops: const [0.4, 1],
                  ),
                ),
              ),
            ),
            // Navbar-Inhalt
            SafeArea(
              child: SizedBox(
                height: 70,
                child: Row(
                  mainAxisAlignment: MainAxisAlignment.spaceAround,
                  children: <Widget>[
                    NavbarItem(
                      index: 0,
                      isSelected: currentIndex == 0,
                      icon: Icons.home_rounded,
                      label: loc.home,
                      onTabTapped: onTabTapped,
                    ),
                    NavbarItem(
                      index: 1,
                      isSelected: currentIndex == 1,
                      icon: Icons.gamepad_rounded,
                      label: loc.matches,
                      onTabTapped: onTabTapped,
                    ),
                    NavbarItem(
                      index: 2,
                      isSelected: currentIndex == 2,
                      icon: Icons.group_rounded,
                      label: loc.groups,
                      onTabTapped: onTabTapped,
                    ),
                    NavbarItem(
                      index: 3,
                      isSelected: currentIndex == 3,
                      icon: Icons.bar_chart_rounded,
                      label: loc.statistics,
                      onTabTapped: onTabTapped,
                    ),
                  ],
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }

  /// Handles tab tap events. Updates the current [index] state.
  void onTabTapped(int index) {
    setState(() {
      currentIndex = index;
    });
  }

  /// Returns the title of the current tab based on [currentIndex].
  String _currentTabTitle(context) {
    final loc = AppLocalizations.of(context);
    switch (currentIndex) {
      case 0:
        return loc.home;
      case 1:
        return loc.matches;
      case 2:
        return loc.groups;
      case 3:
        return loc.statistics;
      default:
        return '';
    }
  }
}