"use client";

import Link from "next/link";
import { usePathname, useRouter } from "next/navigation";
import { useEffect, useState } from "react";
import AccountMenu from "@/components/AccountMenu";
import { useAuth } from "@/components/AuthProvider";
import { navItems, type NavItem } from "@/data/home";
import { getDisplayName } from "@/lib/userName";
import styles from "./DashboardShell.module.css";

const websiteUrl =
  process.env.NEXT_PUBLIC_WEBSITE_URL?.replace(/\/$/, "") ||
  "http://localhost:3000";

function hrefMatches(href: string, pathname: string) {
  return pathname === href || pathname.startsWith(`${href}/`);
}

function activeChildHref(
  children: { href: string }[],
  pathname: string,
) {
  let best = "";
  for (const child of children) {
    if (!hrefMatches(child.href, pathname)) continue;
    if (child.href.length > best.length) best = child.href;
  }
  return best;
}

function groupActive(item: Extract<NavItem, { type: "group" }>, pathname: string) {
  return activeChildHref(item.children, pathname) !== "";
}

export default function DashboardShell({
  children,
}: {
  children: React.ReactNode;
}) {
  const pathname = usePathname();
  const router = useRouter();
  const { user, logout } = useAuth();
  const [menuOpen, setMenuOpen] = useState(false);
  const [openGroup, setOpenGroup] = useState<string | null>(() => {
    const active = navItems.find(
      (item) => item.type === "group" && groupActive(item, pathname),
    );
    return active?.type === "group" ? active.label : null;
  });
  const displayName = getDisplayName(user);

  useEffect(() => {
    const active = navItems.find(
      (item) => item.type === "group" && groupActive(item, pathname),
    );
    if (active?.type === "group") setOpenGroup(active.label);
  }, [pathname]);

  return (
    <div className={styles.shell}>
      <aside className={`${styles.sidebar} ${menuOpen ? styles.sidebarOpen : ""}`}>
        <div className={styles.brand}>
          <img src="/images/icons/logo.png" alt="" width={48} height={48} />
          <div className={styles.brandText}>
            <span>IranBay</span>
            <strong>Dashboard</strong>
          </div>
        </div>

        <nav className={styles.nav} aria-label="Dashboard">
          {navItems.map((item) => {
            if (item.type === "group") {
              const active = groupActive(item, pathname);
              const expanded = openGroup === item.label;
              return (
                <div key={item.label} className={styles.navGroup}>
                  <button
                    type="button"
                    className={`${styles.navItem} ${styles.navGroupBtn} ${
                      active ? styles.navGroupActive : ""
                    }`}
                    aria-expanded={expanded}
                    onClick={() =>
                      setOpenGroup((current) =>
                        current === item.label ? null : item.label,
                      )
                    }
                  >
                    <img src={item.icon} alt="" width={18} height={18} />
                    <span>{item.label}</span>
                    <img
                      className={`${styles.navChevron} ${
                        expanded ? styles.navChevronOpen : ""
                      }`}
                      src="/images/icons/chevron.svg"
                      alt=""
                      width={5}
                      height={9}
                    />
                  </button>
                  {expanded ? (
                    <div className={styles.navSub}>
                      {item.children.map((child) => {
                        const childActive =
                          child.href ===
                          activeChildHref(item.children, pathname);
                        return (
                          <Link
                            key={child.href}
                            href={child.href}
                            prefetch
                            className={`${styles.navSubItem} ${
                              childActive ? styles.navSubItemActive : ""
                            }`}
                            onClick={(event) => {
                              setMenuOpen(false);
                              // Ensure navigation even if soft-route is flaky.
                              if (
                                event.metaKey ||
                                event.ctrlKey ||
                                event.shiftKey ||
                                event.altKey ||
                                event.button !== 0
                              ) {
                                return;
                              }
                              event.preventDefault();
                              router.push(child.href);
                            }}
                          >
                            {child.label}
                          </Link>
                        );
                      })}
                    </div>
                  ) : null}
                </div>
              );
            }

            const active =
              item.href === "/"
                ? pathname === "/"
                : pathname === item.href ||
                  pathname.startsWith(`${item.href}/`);
            return (
              <Link
                key={item.label}
                href={item.href}
                className={`${styles.navItem} ${active ? styles.navItemActive : ""}`}
                onClick={() => setMenuOpen(false)}
              >
                <img src={item.icon} alt="" width={18} height={18} />
                <span>{item.label}</span>
              </Link>
            );
          })}
        </nav>

        <div className={styles.sidebarFoot}>
          <p className={styles.userLabel}>{displayName}</p>
          <a href={websiteUrl} className={styles.siteLink}>
            View website
          </a>
          <button
            type="button"
            className={`outline-btn ${styles.logoutBtn}`}
            onClick={() => {
              logout();
              router.replace("/login");
            }}
          >
            Log out
          </button>
        </div>
      </aside>

      {menuOpen ? (
        <button
          type="button"
          className={styles.backdrop}
          aria-label="Close menu"
          onClick={() => setMenuOpen(false)}
        />
      ) : null}

      <div className={styles.main}>
        <header className={styles.topbar}>
          <button
            type="button"
            className={styles.menuBtn}
            aria-label="Open menu"
            onClick={() => setMenuOpen(true)}
          >
            <img src="/images/icons/menu.svg" alt="" width={22} height={22} />
          </button>
          <div className={styles.topbarCopy}>
            <p className={styles.eyebrow}>Admin workspace</p>
            <p className={styles.topbarHint}>Marketplace control</p>
          </div>
          <div className={styles.topbarActions}>
            <AccountMenu />
          </div>
        </header>

        <div className={styles.content}>{children}</div>
      </div>
    </div>
  );
}