# All files / src/components/layout/navigation NavigationSidebar.tsx

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     'use client';

    import { motion, AnimatePresence } from 'framer-motion';
    import Link from 'next/link';
    import { usePathname } from 'next/navigation';
    import { X } from '@phosphor-icons/react';
    import { cn } from '@/lib/utils';
    import { navigationItems } from './navigation-items';
    import { useNavigation } from './useNavigation';

    /**
     * Material Design 3 Navigation Drawer
     *
     * Android-style modal navigation drawer with:
     * - Scrim overlay
     * - Slide-in animation
     * - Active indicator pill
     * - MD3 typography and spacing
     */
    export function NavigationSidebar() {
      const { menuOpen, setMenuOpen } = useNavigation();
      const pathname = usePathname();

      return (
        <AnimatePresence>
          {menuOpen && (
            <>
              {/* Scrim/Overlay */}
              <motion.div
                initial={{ opacity: 0 }}
                animate={{ opacity: 1 }}
                exit={{ opacity: 0 }}
                transition={{ duration: 0.2 }}
                className="fixed inset-0 z-40 bg-black/32"
                onClick={() => setMenuOpen(false)}
                aria-hidden="true"
                data-testid="navigation-sidebar-overlay"
              />

              {/* Navigation Drawer */}
              <motion.aside
                initial={{ x: -320 }}
                animate={{ x: 0 }}
                exit={{ x: -320 }}
                transition={{
                  type: 'spring',
                  damping: 30,
                  stiffness: 300,
                  mass: 0.8
                }}
                className={cn(
                  "fixed left-0 top-0 h-screen w-80 z-50",
                  "bg-[hsl(var(--card))]",
                  "flex flex-col",
                  "shadow-xl"
                )}
                data-testid="navigation-sidebar"
                id="navigation-sidebar"
                role="navigation"
                aria-label="Main navigation menu"
              >
                {/* Header */}
                <div className="flex items-center justify-between h-16 px-4 border-b border-border/50">
                  <span className="text-base font-medium text-foreground pl-3">
                    CodeSnippet
                  </span>
                  <button
                    onClick={() => setMenuOpen(false)}
                    className={cn(
                      "flex items-center justify-center",
                      "size-10 rounded-full",
                      "text-muted-foreground",
                      "hover:bg-foreground/[0.08]",
                      "active:bg-foreground/[0.12]",
                      "transition-colors duration-200",
                      "outline-none focus-visible:ring-2 focus-visible:ring-primary"
                    )}
                    aria-label="Close navigation"
                    data-testid="navigation-sidebar-close-btn"
                  >
                    <X weight="bold" className="size-5" aria-hidden="true" />
                  </button>
                </div>

                {/* Navigation Items */}
                <nav
                  role="navigation"
                  className="flex-1 overflow-y-auto py-2 px-3"
                  data-testid="navigation-items"
                >
                  <ul className="space-y-0.5">
                    {navigationItems.map((item) => {
                      const Icon = item.icon;
                      const isActive = pathname === item.path;

                      return (
                        <li key={item.path}>
                          <Link
                            href={item.path}
                            onClick={() => setMenuOpen(false)}
                            className={cn(
                              "relative flex items-center gap-3",
                              "h-14 px-4 rounded-full",
                              "text-sm font-medium",
                              "transition-all duration-200",
                              "outline-none",
                              // State layer
                              "before:absolute before:inset-0 before:rounded-full",
                              "before:bg-current before:opacity-0 before:transition-opacity",
                              "hover:before:opacity-[0.08]",
                              "focus-visible:before:opacity-[0.12]",
                              "active:before:opacity-[0.12]",
                              // Active state
                              isActive
                                ? "bg-secondary text-secondary-foreground"
                                : "text-muted-foreground hover:text-foreground"
                            )}
                            data-testid={`nav-link-${item.path.replace(/\//g, '-')}`}
                            aria-current={isActive ? "page" : undefined}
                          >
                            <Icon
                              weight={isActive ? "fill" : "regular"}
                              className="size-6 relative z-10 shrink-0"
                              aria-hidden="true"
                            />
                            <span className="relative z-10">{item.label}</span>

                            {/* Active indicator line */}
                            {isActive && (
                              <motion.div
                                layoutId="nav-indicator"
                                className="absolute right-3 w-1 h-4 bg-primary rounded-full"
                                transition={{ type: 'spring', damping: 30, stiffness: 500 }}
                              />
                            )}
                          </Link>
                        </li>
                      );
                    })}
                  </ul>
                </nav>

                {/* Footer */}
                <div className="p-4 border-t border-border/50">
                  <p className="text-xs text-muted-foreground text-center">
                    Material Design 3
                  </p>
                </div>

                {/* Android gesture bar indicator */}
                <div className="h-5 flex items-center justify-center pb-2">
                  <div className="w-[134px] h-[5px] bg-muted-foreground/40 rounded-full" />
                </div>
              </motion.aside>
            </>
          )}
        </AnimatePresence>
      );
    }