import { useEffect, useState } from "react";
import { Trophy } from "lucide-react";
import { Link, useSearchParams } from "react-router-dom";
import { getVisitorEventRewardBalance, getVisitorRewardHistory } from "../lib/api";
import { getAttendeeToken } from "../lib/attendeeAuth";
import { HeaderMobile } from "../components/HeaderMobile";
import { MobileShell } from "../components/MobileShell";
import { readStoredVisitorContext } from "../types/visitorContext";

function historyLabel(source?: string, description?: string): string {
  if (description && String(description).trim()) return String(description).trim();
  const m: Record<string, string> = {
    registration: "Registration",
    question_ask: "Asked a question",
    question_vote: "Question vote",
    quiz_poll: "Quiz",
    poll: "Poll or survey",
    manual: "Adjustment",
    feedback: "Feedback",
    rating: "Rating",
    quiz: "Quiz",
  };
  return m[source || ""] || source || "Points";
}

export function RewardsPage() {
  const [searchParams] = useSearchParams();
  const urlEventId = searchParams.get("event_id")?.trim() || "";
  const ctx = readStoredVisitorContext();
  const eventId = urlEventId || ctx?.eventId || "";
  const [totalPoints, setTotalPoints] = useState<number | null>(null);
  const [historyItems, setHistoryItems] = useState<
    Awaited<ReturnType<typeof getVisitorRewardHistory>>["items"]
  >([]);
  const [historyLoading, setHistoryLoading] = useState(false);

  useEffect(() => {
    if (!eventId || !getAttendeeToken()) {
      setTotalPoints(null);
      setHistoryItems([]);
      return;
    }
    let cancelled = false;
    getVisitorEventRewardBalance(eventId)
      .then((n) => {
        if (!cancelled) setTotalPoints(Math.max(0, n));
      })
      .catch(() => {
        if (!cancelled) setTotalPoints(0);
      });
    setHistoryLoading(true);
    getVisitorRewardHistory(eventId, { page: 1, limit: 30 })
      .then((r) => {
        if (!cancelled) setHistoryItems(r.items);
      })
      .catch(() => {
        if (!cancelled) setHistoryItems([]);
      })
      .finally(() => {
        if (!cancelled) setHistoryLoading(false);
      });
    return () => {
      cancelled = true;
    };
  }, [eventId]);

  const displayTotal =
    !getAttendeeToken() || !eventId ? "—" : totalPoints === null ? "…" : String(totalPoints);

  return (
    <MobileShell className="relative">
      <HeaderMobile logoUrl={ctx?.event?.logoUrl} eventId={eventId || null} />
      <div className="eb-gradient-auth flex flex-1 flex-col items-center px-6 pb-10 pt-6">
        <Trophy className="size-[68px] text-amber-300" strokeWidth={1.25} />
        <h1 className="mt-1 font-inter text-xl font-semibold text-white">Your Rewards</h1>
        <Link
          to={eventId ? `/leaderboard?event_id=${encodeURIComponent(eventId)}` : "/leaderboard"}
          className="mt-6 w-full max-w-[354px] rounded-full border border-[rgba(214,200,200,0.6)] bg-[#ef8d1d] py-3 text-center text-xs font-semibold uppercase tracking-wide text-white shadow-[0_4px_4px_rgba(0,0,0,0.15)]"
        >
          Leaderboard
        </Link>

        <div className="mt-6 w-full max-w-[354px] rounded-xl bg-white shadow-[0_8px_12px_6px_rgba(0,0,0,0.15),0_4px_4px_rgba(0,0,0,0.3)]">
          <div className="p-4">
            <div className="eb-rank-highlight flex flex-col items-center justify-center gap-2 rounded-3xl border-4 border-white py-4 text-white shadow-[0_9px_16px_rgba(0,0,0,0.14)]">
              <p className="font-inter text-base font-semibold uppercase tracking-wide">Total Points</p>
              <p className="font-inter text-5xl font-bold tabular-nums drop-shadow-[0_4px_4px_rgba(0,0,0,0.25)]">
                {displayTotal}
              </p>
            </div>
            <h2 className="mt-6 font-inter text-base font-semibold text-[#24282f]">Points history</h2>
            <ul className="mt-3 flex flex-col gap-3">
              {historyLoading && (
                <li className="text-xs text-[rgba(36,40,47,0.67)]">Loading…</li>
              )}
              {!historyLoading && historyItems.length === 0 && (
                <li className="text-xs text-[rgba(36,40,47,0.67)]">No transactions yet.</li>
              )}
              {!historyLoading &&
                historyItems.map((row) => {
                  const signed = row.type === "redeemed" ? "-" : "+";
                  const cls =
                    row.type === "redeemed"
                      ? "bg-[#fff0f0] text-[#c02424]"
                      : row.type === "earned"
                        ? "bg-[#ebffee] text-[#009951]"
                        : "bg-[#f3f4f6] text-[#24282f]";
                  return (
                    <li
                      key={row._id}
                      className="flex gap-4 border-b border-[#ededed] pb-3 last:border-0"
                    >
                      <span className={`shrink-0 rounded px-3 py-2 text-xs font-medium shadow-sm ${cls}`}>
                        {signed}
                        {row.points} pts
                      </span>
                      <span className="text-xs leading-snug text-[rgba(36,40,47,0.67)]">
                        {historyLabel(row.source, row.description)}
                      </span>
                    </li>
                  );
                })}
            </ul>
          </div>
        </div>
      </div>
    </MobileShell>
  );
}