"use client";

import Link from "next/link";
import { usePathname } from "next/navigation";
import { signOut } from "next-auth/react";
import {
  LayoutDashboard,
  Users,
  FolderOpen,
  Tag,
  BookOpen,
  Settings,
  LogOut,
  Zap,
  FileText,
  MessageSquare,
} from "lucide-react";
import ThemeToggle from "@/components/ThemeToggle";
import { cn } from "@/lib/utils";

const NAV_ITEMS = [
  { href: "/admin",               label: "Dashboard",    icon: LayoutDashboard, exact: true },
  { href: "/admin/conversazioni", label: "Conversazioni", icon: MessageSquare },
  { href: "/admin/pipeline",      label: "Pipeline",     icon: Zap },
  { href: "/admin/clients",       label: "Clienti",      icon: Users },
  { href: "/admin/projects",      label: "Progetti",     icon: FolderOpen },
  { href: "/admin/preventivi",    label: "Preventivi",   icon: FileText },
  { href: "/admin/offers",        label: "Offerte",      icon: Tag },
  { href: "/admin/catalog",       label: "Catalogo",     icon: BookOpen },
  { href: "/admin/impostazioni",  label: "Impostazioni", icon: Settings },
];

export function AdminSidebar({
  collapsed = false,
  unreadConversations = 0,
}: {
  collapsed?: boolean;
  unreadConversations?: number;
}) {
  const pathname = usePathname();

  const isActive = (href: string, exact?: boolean) =>
    exact ? pathname === href : pathname === href || pathname.startsWith(href + "/");

  // Shared row layout: full width + gap + label when expanded, icon centered
  // (no gap, no padding) when collapsed so nothing pushes the icon off-center.
  const rowClass = collapsed ? "justify-center px-0" : "gap-3 px-3";

  return (
    <aside
      className={cn(
        "shrink-0 min-h-screen bg-[#1A463C] flex flex-col overflow-hidden",
        "transition-[width] duration-350 ease-[cubic-bezier(0.4,0,0.2,1)]",
        collapsed ? "w-16" : "w-[200px]"
      )}
    >
      {/* Logo */}
      <div
        className={cn(
          "h-[57px] flex items-center border-b border-white/10",
          collapsed ? "justify-center px-0" : "px-5"
        )}
      >
        {!collapsed && (
          <span className="font-bold text-white tracking-tight text-sm whitespace-nowrap">
            iamcavalli
          </span>
        )}
      </div>

      {/* Nav links */}
      <nav className="flex-1 px-2 py-4 flex flex-col gap-0.5">
        {NAV_ITEMS.map(({ href, label, icon: Icon, exact }) => {
          const active = isActive(href, exact);
          const badge =
            href === "/admin/conversazioni" && unreadConversations > 0
              ? unreadConversations
              : 0;
          return (
            <Link
              key={href}
              href={href}
              title={collapsed ? label : undefined}
              className={cn(
                "flex items-center py-2.5 rounded-lg text-sm transition-all duration-200",
                rowClass,
                active
                  ? "bg-white/15 text-white font-medium"
                  : "text-white/65 hover:text-white hover:bg-white/10"
              )}
            >
              <span className="relative shrink-0">
                <Icon size={16} strokeWidth={1.8} className="shrink-0" />
                {badge > 0 && collapsed && (
                  <span className="absolute -top-1.5 -right-1.5 w-2 h-2 rounded-full bg-emerald-500 ring-2 ring-[#1A463C]" />
                )}
              </span>
              {!collapsed && (
                <span className="flex-1 flex items-center justify-between gap-2 min-w-0">
                  <span className="whitespace-nowrap">{label}</span>
                  {badge > 0 && (
                    <span className="shrink-0 min-w-[18px] h-[18px] px-1.5 inline-flex items-center justify-center rounded-full bg-emerald-500 text-white text-[10px] font-bold">
                      {badge}
                    </span>
                  )}
                </span>
              )}
            </Link>
          );
        })}
      </nav>

      {/* Theme + Logout */}
      <div className="px-2 py-4 border-t border-white/10 flex flex-col gap-2">
        <div
          className={cn(
            "flex items-center py-1",
            collapsed ? "justify-center px-0" : "justify-between px-3"
          )}
        >
          {!collapsed && <span className="text-xs text-white/50">Tema</span>}
          <ThemeToggle />
        </div>
        <button
          onClick={() => signOut({ callbackUrl: "/admin/login" })}
          title={collapsed ? "Esci" : undefined}
          className={cn(
            "flex items-center py-2.5 w-full rounded-lg text-sm transition-all duration-200",
            "text-white/65 hover:text-white hover:bg-white/10",
            rowClass
          )}
        >
          <LogOut size={16} strokeWidth={1.8} className="shrink-0" />
          {!collapsed && <span className="whitespace-nowrap">Esci</span>}
        </button>
      </div>
    </aside>
  );
}