'use client';

import { useState, useEffect } from 'react';
import Link from 'next/link';
import { usePathname } from 'next/navigation';
import { Moon, Sun, Activity, Menu, X } from 'lucide-react';
import { useTheme } from '@/components/providers/ThemeProvider';
import { Button } from '@/components/ui/button';
import { cn } from '@/lib/utils/cn';

const navItems = [
  { href: '/', label: 'Dashboard' },
  { href: '/processes', label: 'Processes' },
  { href: '/groups', label: 'Groups' },
  { href: '/logs', label: 'Logs' },
  { href: '/config', label: 'Configuration' },
];

export function Navbar() {
  const pathname = usePathname();
  const [mounted, setMounted] = useState(false);
  const [mobileMenuOpen, setMobileMenuOpen] = useState(false);
  const themeContext = useTheme();

  useEffect(() => {
    setMounted(true);
  }, []);

  useEffect(() => {
    // Close mobile menu when route changes
    setMobileMenuOpen(false);
  }, [pathname]);

  useEffect(() => {
    // Prevent scroll when mobile menu is open
    if (mobileMenuOpen) {
      document.body.style.overflow = 'hidden';
    } else {
      document.body.style.overflow = 'unset';
    }
    return () => {
      document.body.style.overflow = 'unset';
    };
  }, [mobileMenuOpen]);

  const toggleTheme = () => {
    if (themeContext) {
      themeContext.setTheme(themeContext.resolvedTheme === 'dark' ? 'light' : 'dark');
    }
  };

  return (
    <nav className="sticky top-0 z-50 w-full border-b bg-background/95 backdrop-blur supports-[backdrop-filter]:bg-background/60">
      <div className="container mx-auto flex h-16 items-center px-4 md:px-6">
        {/* Logo */}
        <Link href="/" className="flex items-center gap-2 mr-4 md:mr-8">
          <Activity className="h-6 w-6 text-primary" />
          <span className="font-bold text-lg md:text-xl bg-gradient-to-r from-primary to-accent bg-clip-text text-transparent">
            Supervisor
          </span>
        </Link>

        {/* Desktop Navigation Links */}
        <div className="hidden md:flex gap-1 flex-1">
          {navItems.map((item) => (
            <Link key={item.href} href={item.href}>
              <Button
                variant="ghost"
                size="sm"
                className={cn(
                  'transition-colors',
                  pathname === item.href && 'bg-accent text-accent-foreground'
                )}
              >
                {item.label}
              </Button>
            </Link>
          ))}
        </div>

        {/* Right side buttons */}
        <div className="flex items-center gap-2 ml-auto">
          {/* Theme Toggle */}
          {mounted && themeContext && (
            <Button
              variant="ghost"
              size="icon"
              onClick={toggleTheme}
              aria-label="Toggle theme"
              className="h-10 w-10"
            >
              {themeContext.resolvedTheme === 'dark' ? (
                <Sun className="h-5 w-5" />
              ) : (
                <Moon className="h-5 w-5" />
              )}
            </Button>
          )}

          {/* Mobile Menu Button */}
          <Button
            variant="ghost"
            size="icon"
            onClick={() => setMobileMenuOpen(!mobileMenuOpen)}
            aria-label="Toggle menu"
            className="md:hidden h-10 w-10"
          >
            {mobileMenuOpen ? (
              <X className="h-6 w-6" />
            ) : (
              <Menu className="h-6 w-6" />
            )}
          </Button>
        </div>
      </div>

      {/* Mobile Menu Drawer */}
      {mobileMenuOpen && (
        <div className="md:hidden fixed inset-0 top-16 z-50">
          <div className="container">
            <nav className="flex flex-col gap-2 bg-background/95 backdrop-blur-md rounded-lg p-4">
              {navItems.map((item) => (
                <Link key={item.href} href={item.href}>
                  <Button
                    variant="ghost"
                    size="lg"
                    className={cn(
                      'w-full justify-start text-lg transition-colors',
                      pathname === item.href && 'bg-accent text-accent-foreground'
                    )}
                  >
                    {item.label}
                  </Button>
                </Link>
              ))}
            </nav>
          </div>
        </div>
      )}
    </nav>
  );
}