"use client";

import { ReactNode, useState } from "react";
import Link from "next/link";
import { usePathname } from "next/navigation";
import { useSession } from "next-auth/react";
import {
  Code2,
  FileText,
  Key,
  Settings,
  Menu,
  ChevronRight,
  X,
  AlertTriangle,
  Loader2,
} from "lucide-react";
import { cn } from "@/lib/utils";

interface NavItem {
  href: string;
  label: string;
  icon: React.ComponentType<{ className?: string }>;
}

const navItems: NavItem[] = [
  { href: "/dashboard", label: "Generations", icon: FileText },
  { href: "/dashboard/keys", label: "API Keys", icon: Key },
  { href: "/dashboard/settings", label: "Settings", icon: Settings },
];

function Sidebar({ onNavigate }: { onNavigate?: () => void }) {
  const pathname = usePathname();

  return (
    <div className="flex flex-col h-full bg-neutral-900 border-r border-neutral-800">
      <div className="p-6 border-b border-neutral-800">
        <Link href="/" className="flex items-center gap-3 group" onClick={onNavigate}>
          <div className="w-10 h-10 rounded-xl bg-gradient-to-br from-blue-400 to-blue-600 flex items-center justify-center shadow-lg shadow-blue-500/20 group-hover:shadow-blue-500/30 transition-shadow">
            <Code2 className="w-5 h-5 text-white" />
          </div>
          <div className="flex flex-col">
            <span className="font-bold text-lg text-neutral-100">CodeBoard</span>
            <span className="text-xs text-neutral-500">Dashboard</span>
          </div>
        </Link>
      </div>

      <nav className="flex-1 p-4 space-y-1">
        {navItems.map((item) => {
          const Icon = item.icon;
          const isActive =
            item.href === "/dashboard"
              ? pathname === "/dashboard"
              : pathname === item.href || pathname.startsWith(`${item.href}/`);

          return (
            <Link
              key={item.href}
              href={item.href}
              onClick={onNavigate}
              className={cn(
                "flex items-center gap-3 px-4 py-3 rounded-lg text-sm font-medium transition-all duration-200",
                isActive
                  ? "bg-blue-500/10 text-blue-400 border border-blue-500/20"
                  : "text-neutral-400 hover:text-neutral-100 hover:bg-neutral-800/50"
              )}
            >
              <Icon className="w-5 h-5" />
              <span className="flex-1">{item.label}</span>
              {isActive && <ChevronRight className="w-4 h-4" />}
            </Link>
          );
        })}
      </nav>

      <div className="p-4 border-t border-neutral-800">
        <div className="px-4 py-3 rounded-lg bg-neutral-800/50 border border-neutral-700/50">
          <p className="text-xs text-neutral-500">CodeBoard v0.1.0</p>
        </div>
      </div>
    </div>
  );
}

function VerificationBanner() {
  const { data: session } = useSession();
  const [dismissed, setDismissed] = useState(false);
  const [resending, setResending] = useState(false);
  const [sent, setSent] = useState(false);

  if (dismissed || !session?.user || session.user.isEmailVerified) {
    return null;
  }

  async function handleResend() {
    setResending(true);
    try {
      const res = await fetch("/api/auth/resend-verification", { method: "POST" });
      if (res.ok) setSent(true);
    } catch {} finally { setResending(false); }
  }

  return (
    <div className="bg-amber-500/10 border-b border-amber-500/20 px-4 py-3">
      <div className="flex items-center justify-between gap-3">
        <div className="flex items-center gap-2 min-w-0">
          <AlertTriangle className="w-4 h-4 text-amber-400 shrink-0" />
          <p className="text-sm text-amber-200 truncate">
            {sent ? "Verification email sent! Check your inbox." : "Please verify your email address. Check your inbox or"}
          </p>
          {!sent && (
            <button onClick={handleResend} disabled={resending}
              className="text-sm font-medium text-amber-400 hover:text-amber-300 transition-colors whitespace-nowrap inline-flex items-center gap-1">
              {resending && <Loader2 className="w-3 h-3 animate-spin" />}
              {resending ? "sending..." : "click to resend."}
            </button>
          )}
        </div>
        <button onClick={() => setDismissed(true)} aria-label="Dismiss" className="p-1 rounded text-amber-400/60 hover:text-amber-300 transition-colors shrink-0">
          <X className="w-4 h-4" />
        </button>
      </div>
    </div>
  );
}

export default function DashboardLayout({ children }: { children: ReactNode }) {
  const [sidebarOpen, setSidebarOpen] = useState(false);

  return (
    <div className="min-h-screen bg-neutral-950 flex">
      <aside className="hidden lg:block w-64 h-screen sticky top-0">
        <Sidebar />
      </aside>

      {sidebarOpen && (
        <div className="fixed inset-0 bg-black/50 z-40 lg:hidden" onClick={() => setSidebarOpen(false)} />
      )}

      <aside className={cn(
        "fixed inset-y-0 left-0 w-72 z-50 transform transition-transform duration-300 ease-in-out lg:hidden",
        sidebarOpen ? "translate-x-0" : "-translate-x-full"
      )}>
        <Sidebar onNavigate={() => setSidebarOpen(false)} />
      </aside>

      <main id="main-content" className="flex-1 min-w-0">
        <VerificationBanner />
        <header className="lg:hidden sticky top-0 z-30 bg-neutral-950/80 backdrop-blur-md border-b border-neutral-800 px-4 py-3">
          <div className="flex items-center justify-between">
            <button onClick={() => setSidebarOpen(true)} aria-label="Open menu"
              className="p-2 rounded-lg bg-neutral-900 border border-neutral-800 text-neutral-400 hover:text-neutral-100 transition-colors">
              <Menu className="w-5 h-5" />
            </button>
            <Link href="/" className="flex items-center gap-2">
              <div className="w-8 h-8 rounded-lg bg-gradient-to-br from-blue-400 to-blue-600 flex items-center justify-center">
                <Code2 className="w-4 h-4 text-white" />
              </div>
              <span className="font-bold text-neutral-100">CodeBoard</span>
            </Link>
            <div className="w-9" />
          </div>
        </header>
        <div className="p-4 sm:p-6 lg:p-8">{children}</div>
      </main>
    </div>
  );
}