"use client";

import { useEffect, useState } from "react";
import { Menu, User } from "lucide-react";
import { AdminSidebar } from "@/components/admin/AdminSidebar";

const SIDEBAR_STORAGE_KEY = "iamcavalli:sidebar";

/**
 * Client shell for every /admin/* page: collapsible sidebar + top header +
 * <main>. Collapse state is persisted to localStorage and read on mount
 * (starts expanded on server/first paint to avoid a hydration mismatch,
 * then reconciles client-side — mirrors the pattern used by useTheme).
 */
export function AdminShell({
  children,
  unreadConversations = 0,
}: {
  children: React.ReactNode;
  unreadConversations?: number;
}) {
  const [collapsed, setCollapsed] = useState(false);

  useEffect(() => {
    const stored = window.localStorage.getItem(SIDEBAR_STORAGE_KEY);
    if (stored === "collapsed") setCollapsed(true);
  }, []);

  function toggleCollapsed() {
    setCollapsed((prev) => {
      const next = !prev;
      window.localStorage.setItem(SIDEBAR_STORAGE_KEY, next ? "collapsed" : "expanded");
      return next;
    });
  }

  return (
    <div className="flex min-h-screen bg-background">
      <AdminSidebar collapsed={collapsed} unreadConversations={unreadConversations} />

      <div className="flex-1 flex flex-col min-w-0">
        {/* Top header bar */}
        <header className="h-16 shrink-0 bg-card border-b border-border px-6 flex items-center justify-between">
          <div className="flex items-center gap-4">
            <button
              type="button"
              onClick={toggleCollapsed}
              title="Espandi/Comprimi Sidebar"
              aria-label="Espandi/Comprimi Sidebar"
              className="p-2 -ml-2 rounded-lg text-muted-foreground hover:bg-muted hover:text-foreground transition-colors focus:outline-none"
            >
              <Menu className="w-5 h-5" />
            </button>
            <span className="text-xs font-medium text-muted-foreground">Area di Lavoro</span>
          </div>

          <div className="flex items-center gap-3">
            <span className="text-xs font-semibold text-foreground">Admin</span>
            {/* TODO: gestione utenti/collaboratori — placeholder avatar until
                real user accounts + uploaded profile images are wired up. */}
            <div className="w-8 h-8 rounded-full bg-primary text-primary-foreground flex items-center justify-center shrink-0">
              <User className="w-4 h-4" />
            </div>
          </div>
        </header>

        <main className="flex-1 overflow-y-auto">
          <div className="max-w-[1400px] w-full mx-auto px-8 py-8 lg:px-10">{children}</div>
        </main>
      </div>
    </div>
  );
}
