import { useCallback, useEffect, useRef, useState, type ReactNode } from "react";
import { Gift, Home, MessageCircle, MessageCircleQuestion, Star, Trophy, Users } from "lucide-react";
import { Link } from "react-router-dom";
import { readStoredVisitorContext, visitorEventUrl } from "../types/visitorContext";

type HyperNavigationFABProps = {
  /** Preferred; falls back to stored visitor context `eventId`. */
  eventId?: string;
  /** When set (e.g. on session page), matches Audience Questions “View All” (`/questions?event_id&session_id`). */
  sessionId?: string;
  /** When true, add Feedback to the menu (session page + event allows feedback + session flag). */
  showFeedbackNav?: boolean;
  /** When true, add Ratings to the menu (session page + event ratings on + session flag). */
  showRatingsNav?: boolean;
  /** When set with showFeedbackNav, append form_id to the feedback link. */
  feedbackFormId?: string;
  /** When set with showRatingsNav, append form_id to the ratings link. */
  ratingsFormId?: string;
};

type MenuItem = {
  label: string;
  to: string;
  icon: ReactNode;
};

/** Fixed to viewport bottom-right, aligned with `MobileShell` max width (402px). Opens actions above the FAB. */
export function HyperNavigationFAB({
  eventId: eventIdProp,
  sessionId: sessionIdProp,
  showFeedbackNav = false,
  showRatingsNav = false,
  feedbackFormId,
  ratingsFormId,
}: HyperNavigationFABProps) {
  const ctx = readStoredVisitorContext();
  const eventId = (eventIdProp ?? ctx?.eventId ?? "").trim();
  const sessionId = (sessionIdProp ?? ctx?.sessionId ?? "").trim();
  const [open, setOpen] = useState(false);
  const wrapRef = useRef<HTMLDivElement>(null);

  const eventHome = eventId ? visitorEventUrl(eventId) : "/";
  const rewards =
    eventId ? `/rewards?${new URLSearchParams({ event_id: eventId }).toString()}` : "/rewards";
  const leaderboard =
    eventId ? `/leaderboard?${new URLSearchParams({ event_id: eventId }).toString()}` : "/leaderboard";
  const allQuestionsQs = new URLSearchParams();
  if (eventId) allQuestionsQs.set("event_id", eventId);
  if (sessionId) allQuestionsQs.set("session_id", sessionId);
  const allQuestions =
    eventId ? `/questions?${allQuestionsQs.toString()}` : "/questions";
  const feedbackQs = new URLSearchParams();
  if (eventId) feedbackQs.set("event_id", eventId);
  if (sessionId) feedbackQs.set("session_id", sessionId);
  if (feedbackFormId?.trim()) feedbackQs.set("form_id", feedbackFormId.trim());
  const feedbackTo = eventId ? `/feedback?${feedbackQs.toString()}` : "/feedback";
  const ratingsQs = new URLSearchParams();
  if (eventId) ratingsQs.set("event_id", eventId);
  if (sessionId) ratingsQs.set("session_id", sessionId);
  if (ratingsFormId?.trim()) ratingsQs.set("form_id", ratingsFormId.trim());
  const ratingsTo = eventId ? `/ratings?${ratingsQs.toString()}` : "/ratings";

  const items: MenuItem[] = [
    { label: "Event Home", to: eventHome, icon: <Home className="size-4 shrink-0 text-[#1e72ef]" strokeWidth={1.75} /> },
    { label: "Rewards", to: rewards, icon: <Gift className="size-4 shrink-0 text-[#1e72ef]" strokeWidth={1.75} /> },
    { label: "Leaderboard", to: leaderboard, icon: <Trophy className="size-4 shrink-0 text-[#1e72ef]" strokeWidth={1.75} /> },
    ...(showFeedbackNav
      ? [{ label: "Feedback", to: feedbackTo, icon: <MessageCircle className="size-4 shrink-0 text-[#1e72ef]" strokeWidth={1.75} /> }]
      : []),
    ...(showRatingsNav
      ? [{ label: "Ratings", to: ratingsTo, icon: <Star className="size-4 shrink-0 text-[#1e72ef]" strokeWidth={1.75} /> }]
      : []),
    {
      label: "All Questions",
      to: allQuestions,
      icon: <MessageCircleQuestion className="size-4 shrink-0 text-[#1e72ef]" strokeWidth={1.75} />,
    },
  ];

  useEffect(() => {
    if (!open) return;
    const onDoc = (e: MouseEvent) => {
      if (wrapRef.current && !wrapRef.current.contains(e.target as Node)) setOpen(false);
    };
    const onKey = (e: KeyboardEvent) => {
      if (e.key === "Escape") setOpen(false);
    };
    document.addEventListener("mousedown", onDoc);
    document.addEventListener("keydown", onKey);
    return () => {
      document.removeEventListener("mousedown", onDoc);
      document.removeEventListener("keydown", onKey);
    };
  }, [open]);

  const close = useCallback(() => setOpen(false), []);

  return (
    <div className="pointer-events-none fixed inset-x-0 bottom-0 z-50 flex justify-center pb-6">
      <div className="pointer-events-none flex w-full max-w-[402px] justify-end pr-4">
        <div ref={wrapRef} className="relative flex flex-col items-end pointer-events-auto">
          {open ? (
            <div
              className="mb-2 w-[min(280px,calc(100vw-2rem))] divide-y divide-[#f2f2f7] overflow-hidden rounded-xl border border-[rgba(116,112,112,0.2)] bg-white shadow-[0_8px_24px_rgba(12,12,13,0.12)]"
              role="menu"
              aria-label="Quick navigation"
            >
              {items.map((item) => (
                <Link
                  key={item.label}
                  to={item.to}
                  role="menuitem"
                  onClick={close}
                  className="flex items-center gap-3 px-4 py-3 text-left text-sm font-medium text-[#24282f] transition-colors hover:bg-[#f2f2f7] active:bg-[#e5e5ea]"
                >
                  {item.icon}
                  {item.label}
                </Link>
              ))}
            </div>
          ) : null}

          <button
            type="button"
            onClick={() => setOpen((v) => !v)}
            aria-expanded={open}
            aria-haspopup="menu"
            aria-label={open ? "Close quick navigation" : "Open quick navigation"}
            className="relative flex size-12 shrink-0 items-center justify-center rounded-full border-2 border-white text-white shadow-[0_14px_18px_rgba(0,0,0,0.2),0_2px_3px_rgba(0,0,0,0.17)] eb-gradient-fab"
          >
            <span
              className="pointer-events-none absolute inset-[-2px] rounded-full shadow-[inset_0_6px_4px_rgba(0,0,0,0.25)]"
              aria-hidden
            />
            <Users className={`relative z-[1] size-7 transition-transform ${open ? "scale-90" : ""}`} strokeWidth={1.75} />
          </button>
        </div>
      </div>
    </div>
  );
}