"use client";

import React, { useEffect, useState } from "react";
import Link from "next/link";
import { useSession, signOut } from "next-auth/react";
import clsx from "clsx";
import { Search, ShoppingCart, ChevronDown, LogOut, User } from "lucide-react";
import { Button } from "@/components/ui/button";
import { ThemeToggle } from "@/components/theme-toggle";
import {
  getCookieSession,
  logoutViaCookie,
  clearTokens,
  AUTH_CHANGE_EVENT,
  notifyAuthChange,
} from "@/lib/auth-api";

const navItems = [
  { label: "Home", href: "/", hasDropdown: true },
  { label: "About Us", href: "/about", hasDropdown: false },
  { label: "Pages", href: "/pages", hasDropdown: true },
  { label: "Blog", href: "/blog", hasDropdown: true, active: true },
  { label: "Contact", href: "/contact", hasDropdown: false },
];

function TechwixLogo() {
  return (
    <Link href="/" className="flex items-center gap-2">
      <svg
        width="32"
        height="32"
        viewBox="0 0 32 32"
        fill="none"
        xmlns="http://www.w3.org/2000/svg"
        className="shrink-0"
      >
        <defs>
          <linearGradient id="logoGrad" x1="0%" y1="0%" x2="100%" y2="100%">
            <stop offset="0%" stopColor="#3b82f6" />
            <stop offset="100%" stopColor="#8b5cf6" />
          </linearGradient>
        </defs>
        {/* Single gradient shape - diamond/arrowhead */}
        <path
          d="M16 5L27 16L16 27L5 16L16 5Z"
          fill="url(#logoGrad)"
        />
        <path
          d="M16 9L23 16L16 23L9 16L16 9Z"
          fill="white"
          fillOpacity="0.2"
        />
      </svg>
      <span className="text-xl font-semibold text-neutral-800 dark:text-neutral-100">
        Techwix
      </span>
    </Link>
  );
}

export default function Header() {
  const [scrolled, setScrolled] = useState(false);
  const { data: session, status } = useSession();
  const [cookieLoggedIn, setCookieLoggedIn] = useState(false);

  const isLoggedIn = Boolean(session?.user) || cookieLoggedIn;

  useEffect(() => {
    const onScroll = () => setScrolled(window.scrollY > 8);
    window.addEventListener("scroll", onScroll, { passive: true });
    onScroll();
    return () => window.removeEventListener("scroll", onScroll);
  }, []);

  const refreshCookieSession = () => {
    getCookieSession().then((s) => setCookieLoggedIn(s.loggedIn));
  };

  useEffect(() => {
    refreshCookieSession();
    const handler = () => refreshCookieSession();
    window.addEventListener(AUTH_CHANGE_EVENT, handler);
    return () => window.removeEventListener(AUTH_CHANGE_EVENT, handler);
  }, []);

  const handleLogout = async () => {
    clearTokens(); // eski localStorage token varsa temizle
    await logoutViaCookie();
    signOut({ callbackUrl: "/" });
    setCookieLoggedIn(false);
    notifyAuthChange();
  };

  return (
    <header
      className={clsx(
        "sticky top-0 z-40 w-full border-b border-neutral-200/80 transition-colors duration-200 backdrop-blur dark:border-neutral-800",
        scrolled
          ? "bg-white/95 shadow-sm dark:bg-neutral-950/95"
          : "bg-white dark:bg-neutral-950/90"
      )}
    >
      <div className="container mx-auto flex h-16 items-center justify-between gap-6 px-4 lg:px-6">
        <TechwixLogo />

        <nav className="hidden items-center gap-1 md:flex">
          {navItems.map((item) => (
            <Link
              key={item.href}
              href={item.href}
              className={clsx(
                "flex items-center gap-0.5 rounded-md px-3 py-2 text-sm font-medium transition-colors",
                item.active
                  ? "text-blue-500 dark:text-blue-400"
                  : "text-neutral-700 hover:text-neutral-900 dark:text-neutral-300 dark:hover:text-white"
              )}
            >
              {item.label}
              {item.hasDropdown && (
                <ChevronDown className="size-3.5 text-current opacity-70" />
              )}
            </Link>
          ))}
        </nav>

        <div className="flex items-center gap-2">
          <ThemeToggle />
          <button
            type="button"
            className="relative rounded-md p-2 text-neutral-600 hover:bg-neutral-100 hover:text-neutral-900 dark:text-neutral-400 dark:hover:bg-neutral-800 dark:hover:text-white"
            aria-label="Cart"
          >
            <ShoppingCart className="size-5" />
            <span className="absolute -right-0.5 -top-0.5 flex size-4 items-center justify-center rounded-full bg-blue-500 text-[10px] font-medium text-white">
              0
            </span>
          </button>
          <button
            type="button"
            className="rounded-md p-2 text-neutral-600 hover:bg-neutral-100 hover:text-neutral-900 dark:text-neutral-400 dark:hover:bg-neutral-800 dark:hover:text-white"
            aria-label="Search"
          >
            <Search className="size-5" />
          </button>
          {status === "loading" ? null : isLoggedIn ? (
            <>
              <Link
                href="/profile"
                className="flex items-center gap-1.5 rounded-md px-3 py-2 text-sm font-medium text-neutral-700 hover:bg-neutral-100 hover:text-neutral-900 dark:text-neutral-300 dark:hover:bg-neutral-800 dark:hover:text-white"
              >
                <User className="size-4" />
                <span className="hidden sm:inline">Profil</span>
              </Link>
              <button
                type="button"
                onClick={handleLogout}
                className="flex items-center gap-1.5 rounded-md px-3 py-2 text-sm font-medium text-neutral-700 hover:bg-neutral-100 hover:text-neutral-900 dark:text-neutral-300 dark:hover:bg-neutral-800 dark:hover:text-white"
              >
                <LogOut className="size-4" />
                <span className="hidden sm:inline">Çıkış</span>
              </button>
            </>
          ) : (
            <>
              <Button variant="ghost" size="sm" asChild>
                <Link href="/auth/login">Giriş</Link>
              </Button>
              <Button
                asChild
                size="sm"
                className="rounded-md bg-gradient-to-r from-blue-500 to-blue-400 text-white shadow-sm hover:from-blue-600 hover:to-blue-500 dark:from-blue-600 dark:to-blue-500 dark:hover:from-blue-700 dark:hover:to-blue-600"
              >
                <Link href="/auth/register">Kayıt</Link>
              </Button>
            </>
          )}
        </div>
      </div>
    </header>
  );
}