import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_svg/flutter_svg.dart';
import 'package:lba/gen/assets.gen.dart';
import 'package:lba/res/colors.dart';
import 'package:lba/screens/mains/discover/discover.dart';
import 'package:lba/screens/mains/hunt/hunt.dart';
import 'package:lba/screens/mains/nearby/mainNearby/nearby.dart';
import 'package:lba/screens/mains/planner/planner.dart';
import 'package:lba/screens/mains/profile/profile.dart';

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

  @override
  State<MainScreen> createState() => _MainScreenState();
}

class _MainScreenState extends State<MainScreen> {
  int _currentIndex = 0;

  final List<Widget> _screens = [
    const Nearby(),
    const Discover(),
    const Hunt(),
    const Planner(),
    const Profile(),
  ];

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    _updateSystemUI();
  }

  void _updateSystemUI() {
    final brightness = Theme.of(context).brightness;
    final isDark = brightness == Brightness.dark;
    
    SystemChrome.setSystemUIOverlayStyle(
      SystemUiOverlayStyle(
        statusBarColor: Colors.transparent,
        statusBarIconBrightness: isDark ? Brightness.light : Brightness.dark,
        statusBarBrightness: isDark ? Brightness.dark : Brightness.light,
        systemNavigationBarColor: AppColors.scaffoldBackground,
        systemNavigationBarIconBrightness: isDark ? Brightness.light : Brightness.dark,
        systemNavigationBarDividerColor: AppColors.divider,
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      extendBody: true,
      body: AnimatedSwitcher(
        duration: const Duration(milliseconds: 400),
        transitionBuilder: (Widget child, Animation<double> animation) {
          final bool isGoingForward =
              (child.key as ValueKey<int>).value > _currentIndex;

          final slideAnimation = Tween<Offset>(
            begin: Offset(isGoingForward ? 1.0 : -1.0, 0.0),
            end: Offset.zero,
          ).animate(
            CurvedAnimation(
              parent: animation,
              curve: Curves.easeInOutCubic,
            ),
          );

          return SlideTransition(
            position: slideAnimation,
            child: FadeTransition(
              opacity: animation,
              child: child,
            ),
          );
        },
        child: KeyedSubtree(
          key: ValueKey<int>(_currentIndex),
          child: _screens[_currentIndex],
        ),
      ),
      bottomNavigationBar: CustomBottomNavigationBar(
        onTap: (int index) {
          setState(() {
            _currentIndex = index;
          });
          _updateSystemUI();
        },
        currentIndex: _currentIndex,
      ),
    );
  }
}

class CustomBottomNavigationBar extends StatefulWidget {
  final Function(int) onTap;
  final int currentIndex;

  const CustomBottomNavigationBar({
    super.key,
    required this.onTap,
    required this.currentIndex,
  });

  @override
  State<CustomBottomNavigationBar> createState() => _CustomBottomNavigationBarState();
}

class _CustomBottomNavigationBarState extends State<CustomBottomNavigationBar>
    with SingleTickerProviderStateMixin {
  final List<_NavItem> items = [
    _NavItem('Nearby', Assets.icons.nearby.path, Assets.icons.nearby2.path),
    _NavItem('Discover', Assets.icons.receiptDiscount.path, Assets.icons.receiptDiscount2.path),
    _NavItem('Hunt', Assets.icons.game.path, Assets.icons.game2.path),
    _NavItem('Planner', Assets.icons.calendarTick.path, Assets.icons.calendarTick2.path),
    _NavItem('Profile', Assets.icons.profile.path, Assets.icons.profile2.path),
  ];

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.only(left: 16, right: 16, bottom: 16),
      child: AnimatedContainer(
        duration: const Duration(milliseconds: 300),
        curve: Curves.easeInOutCubic,
        height: 70,
        decoration: BoxDecoration(
          color: AppColors.surface,
          borderRadius: BorderRadius.circular(12),
          boxShadow: [
            BoxShadow(
              color: AppColors.shadowColor,
              blurRadius: 20,
              offset: const Offset(0, 10),
            ),
          ],
        ),
        child: Row(
          mainAxisAlignment: MainAxisAlignment.spaceAround,
          children: List.generate(items.length, (index) {
            final item = items[index];
            final bool isSelected = index == widget.currentIndex;
            return GestureDetector(
              onTap: () => widget.onTap(index),
              child: AnimatedContainer(
                duration: const Duration(milliseconds: 350),
                curve: Curves.easeOutCubic,
                padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
                decoration: BoxDecoration(
                  color: isSelected ? AppColors.primary.withOpacity(0.1) : Colors.transparent,
                  borderRadius: BorderRadius.circular(15),
                ),
                child: Row(
                  children: [
                    AnimatedSwitcher(
                      duration: const Duration(milliseconds: 350),
                      transitionBuilder: (child, animation) {
                        return ScaleTransition(
                          scale: animation,
                          child: FadeTransition(
                            opacity: animation,
                            child: child,
                          ),
                        );
                      },
                      child: SvgPicture.asset(
                        isSelected ? item.selectedIconPath : item.iconPath,
                        key: ValueKey<bool>(isSelected),
                        width: 24,
                        height: 24,
                        colorFilter: isSelected 
                            ? ColorFilter.mode(AppColors.primary, BlendMode.srcIn)
                            : ColorFilter.mode(AppColors.textSecondary, BlendMode.srcIn),
                      ),
                    ),
                    AnimatedSize(
                      duration: const Duration(milliseconds: 350),
                      curve: Curves.easeOutCubic,
                      child: isSelected
                          ? Row(
                              children: [
                                const SizedBox(width: 8),
                                AnimatedDefaultTextStyle(
                                  duration: const Duration(milliseconds: 350),
                                  style: TextStyle(
                                    color: AppColors.primary,
                                    fontWeight: FontWeight.w600,
                                    fontSize: 14,
                                  ),
                                  child: Text(item.label),
                                ),
                              ],
                            )
                          : const SizedBox(),
                    ),
                  ],
                ),
              ),
            );
          }),
        ),
      ),
    );
  }
}

class _NavItem {
  final String label;
  final String iconPath;
  final String selectedIconPath;

  _NavItem(this.label, this.iconPath, this.selectedIconPath);
}