import 'package:flutter/material.dart';
import 'frosted_glass_container.dart';

class FloatingNavItem {
  final String label;
  final IconData icon;

  const FloatingNavItem({required this.label, required this.icon});
}

/// A floating pill-shaped bottom navigation bar in the style of Google
/// Photos' 2026 redesign: unselected destinations collapse to just their
/// icon, the selected destination expands into an icon+label capsule, and
/// a detached circular action (search) sits just outside the pill.
class FloatingBottomNavBar extends StatelessWidget {
  final int selectedIndex;
  final ValueChanged<int> onDestinationSelected;
  final List<FloatingNavItem> items;
  final VoidCallback? onSearchTap;
  final double opacity;
  final double blurSigma;

  const FloatingBottomNavBar({
    super.key,
    required this.selectedIndex,
    required this.onDestinationSelected,
    required this.items,
    this.onSearchTap,
    this.opacity = 0.55,
    this.blurSigma = 28,
  });

  @override
  Widget build(BuildContext context) {
    final colorScheme = Theme.of(context).colorScheme;

    return SafeArea(
      child: Align(
        alignment: Alignment.bottomCenter,
        child: Padding(
          padding: const EdgeInsets.only(bottom: 20, left: 20, right: 20),
          child: ConstrainedBox(
            constraints: const BoxConstraints(maxWidth: 480),
            child: Row(
              mainAxisSize: MainAxisSize.min,
              children: [
                _buildPill(context, colorScheme),
                const SizedBox(width: 10),
                _buildSearchButton(context, colorScheme),
              ],
            ),
          ),
        ),
      ),
    );
  }

  Widget _buildPill(BuildContext context, ColorScheme colorScheme) {
    return FrostedGlassContainer(
      opacity: opacity,
      blurSigma: blurSigma,
      child: Padding(
        padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 6),
        child: Row(
          mainAxisSize: MainAxisSize.min,
          children: List.generate(items.length, (index) {
            final item = items[index];
            final isSelected = selectedIndex == index;

            return InkWell(
              onTap: () => onDestinationSelected(index),
              borderRadius: BorderRadius.circular(26),
              splashColor: colorScheme.primary.withValues(alpha: 0.12),
              highlightColor: Colors.transparent,
              child: AnimatedContainer(
                duration: const Duration(milliseconds: 250),
                curve: Curves.easeInOutCubic,
                padding: EdgeInsets.symmetric(
                  horizontal: isSelected ? 16 : 12,
                  vertical: 12,
                ),
                decoration: BoxDecoration(
                  color: isSelected ? colorScheme.primary : Colors.transparent,
                  borderRadius: BorderRadius.circular(26),
                ),
                child: Row(
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    Icon(
                      item.icon,
                      size: 22,
                      color: isSelected
                          ? colorScheme.onPrimary
                          : colorScheme.onSurfaceVariant,
                    ),
                    if (isSelected) ...[
                      const SizedBox(width: 8),
                      Text(
                        item.label,
                        maxLines: 1,
                        overflow: TextOverflow.ellipsis,
                        style: TextStyle(
                          fontSize: 13,
                          fontWeight: FontWeight.w700,
                          color: colorScheme.onPrimary,
                          letterSpacing: 0.1,
                        ),
                      ),
                    ],
                  ],
                ),
              ),
            );
          }),
        ),
      ),
    );
  }

  Widget _buildSearchButton(BuildContext context, ColorScheme colorScheme) {
    return FrostedGlassContainer(
      opacity: opacity,
      blurSigma: blurSigma,
      child: SizedBox(
        width: 52,
        height: 52,
        child: InkWell(
          onTap: onSearchTap,
          borderRadius: BorderRadius.circular(32),
          splashColor: colorScheme.primary.withValues(alpha: 0.12),
          child: Icon(
            Icons.search_rounded,
            color: colorScheme.onSurfaceVariant,
            size: 24,
          ),
        ),
      ),
    );
  }
}