"use client";

import { useState } from "react";
import Link from "next/link";
import { usePathname } from "next/navigation";
import { useSession, signOut } from "next-auth/react";
import { NotificationBell } from "./NotificationBell";

export function Navbar() {
  const pathname = usePathname();
  const { data: session, status } = useSession();
  const [mobileMenuOpen, setMobileMenuOpen] = useState(false);

  const role = (session?.user as any)?.role || "GUEST";
  const isEmployer = role === "EMPLOYER";
  const isAdmin = role === "ADMIN";

  // Build role-tailored navigation items
  const navLinks: Array<{ href: string; label: string; badge?: string }> = [
    { href: "/jobs", label: "Search Directory" },
    { href: "/companies", label: "Companies" },
    { href: "/salary-insights", label: "Salaries" },
  ];

  if (status === "authenticated") {
    if (isEmployer) {
      navLinks.push(
        { href: "/employer/jobs", label: "Listings" },
        { href: "/employer/jobs/new", label: "Post a Job", badge: "New" },
        { href: "/employer/ats", label: "Pipeline" },
        { href: "/employer/team", label: "Team" },
        { href: "/employer/candidates", label: "Talent" }
      );
    } else if (isAdmin) {
      navLinks.push(
        { href: "/employer/jobs", label: "Jobs" },
        { href: "/employer/jobs/new", label: "Post Job" },
        { href: "/employer/ats", label: "ATS" },
        { href: "/admin", label: "Admin Console", badge: "Admin" }
      );
    } else {
      // Job Seeker
      navLinks.push(
        { href: "/saved-jobs", label: "Saved" },
        { href: "/applications", label: "Applications" },
        { href: "/resume", label: "Resume" },
        { href: "/alerts", label: "Alerts" },
        { href: "/profile", label: "Profile" }
      );
    }
  }

  return (
    <header className="bg-[#fbfbf9] border-b border-stone-200 sticky top-0 z-40">
      <div className="max-w-7xl mx-auto px-4 sm:px-6">
        <div className="flex justify-between h-13 items-center">
          {/* Logo & Desktop Nav */}
          <div className="flex items-center space-x-8">
            <Link
              href="/"
              className="flex items-baseline space-x-2 text-stone-900 group"
              aria-label="DirectWire Home"
            >
              <span className="font-serif-editorial text-2xl font-bold tracking-tight text-stone-900">
                DirectWire
              </span>
              <span className="text-[10px] font-mono tracking-widest text-stone-400 uppercase">
                / beta
              </span>
            </Link>

            <nav className="hidden md:flex items-center space-x-1 border-l border-stone-200 pl-6 h-6">
              {navLinks.map((link) => {
                const isActive =
                  link.href === "/"
                    ? pathname === "/"
                    : pathname.startsWith(link.href);
                return (
                  <Link
                    key={link.href}
                    href={link.href}
                    className={`px-2.5 py-1 text-xs transition-colors flex items-center space-x-1.5 ${
                      isActive
                        ? "text-stone-950 font-semibold border-b-2 border-stone-900 -mb-[1px]"
                        : "text-stone-600 hover:text-stone-900"
                    }`}
                  >
                    <span>{link.label}</span>
                    {link.badge && (
                      <span className="text-[9px] px-1 py-0.2 bg-stone-100 text-stone-700 border border-stone-300 rounded font-mono">
                        {link.badge}
                      </span>
                    )}
                  </Link>
                );
              })}
            </nav>
          </div>

          {/* User Session & Actions */}
          <div className="flex items-center space-x-4 text-xs">
            {status === "authenticated" && session?.user ? (
              <div className="flex items-center space-x-3">
                <NotificationBell />
                <div className="hidden sm:flex items-center space-x-1.5 text-stone-700">
                  <span className="w-1.5 h-1.5 rounded-full bg-amber-600"></span>
                  <span className="font-medium">
                    {session.user.name || session.user.email}
                  </span>
                  <span className="text-[10px] text-stone-400 font-mono">
                    [{role}]
                  </span>
                </div>
                <button
                  onClick={() => signOut({ callbackUrl: "/login" })}
                  className="text-stone-500 hover:text-stone-900 transition-colors px-1 py-1 font-medium underline underline-offset-4"
                >
                  Sign Out
                </button>
              </div>
            ) : (
              <div className="flex items-center space-x-4">
                <Link
                  href="/login"
                  className="text-stone-700 hover:text-stone-950 font-medium transition-colors"
                >
                  Log In
                </Link>
                <Link
                  href="/register"
                  className="bg-stone-900 hover:bg-stone-800 text-stone-50 font-medium px-3.5 py-1.5 text-xs transition-colors border border-stone-900"
                >
                  Get Started →
                </Link>
              </div>
            )}

            {/* Mobile Menu Toggle */}
            <button
              onClick={() => setMobileMenuOpen(!mobileMenuOpen)}
              className="md:hidden p-1.5 text-stone-700 hover:text-stone-900 border border-stone-200"
              aria-label={mobileMenuOpen ? "Close menu" : "Open menu"}
            >
              <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                {mobileMenuOpen ? (
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.5} d="M6 18L18 6M6 6l12 12" />
                ) : (
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.5} d="M4 6h16M4 12h16M4 18h16" />
                )}
              </svg>
            </button>
          </div>
        </div>
      </div>

      {/* Mobile Dropdown */}
      {mobileMenuOpen && (
        <div className="md:hidden bg-[#fbfbf9] border-t border-b border-stone-200 px-4 py-3 space-y-1">
          {navLinks.map((link) => {
            const isActive =
              link.href === "/"
                ? pathname === "/"
                : pathname.startsWith(link.href);
            return (
              <Link
                key={link.href}
                href={link.href}
                onClick={() => setMobileMenuOpen(false)}
                className={`flex items-center justify-between px-3 py-2 text-xs transition-colors ${
                  isActive
                    ? "bg-stone-200/70 text-stone-950 font-bold"
                    : "text-stone-700 hover:bg-stone-100"
                }`}
              >
                <span>{link.label}</span>
                {link.badge && (
                  <span className="text-[10px] px-1.5 py-0.5 border border-stone-300 font-mono">
                    {link.badge}
                  </span>
                )}
              </Link>
            );
          })}
        </div>
      )}
    </header>
  );
}