import { useCallback, useEffect, useState } from "react";
import { Link } from "react-router-dom";
import { ChevronLeft, ChevronRight } from "lucide-react";
import { useSessionQuestionsRtdb } from "../hooks/useSessionQuestionsRtdb";
import { AudienceQuestionCard, type AudienceQuestionItem } from "./AudienceQuestionCard";
import { AskQuestionModal } from "./AskQuestionModal";

type QuestionItem = AudienceQuestionItem & { _id?: string };

const sample: QuestionItem[] = [
  {
    author: "Ashok Kuwal",
    text: "Role of GINA Guidelines for Iniang and Monitoring Asthma Treatment?",
    up: 2,
    down: 3,
  },
  {
    author: "Ashok Kuwal",
    text: "Role of GINA Guidelines for Iniang and Monitoring Asthma Treatment?",
    up: 2,
    down: 3,
  },
  {
    author: "Ashok Kuwal",
    text: "Role of GINA Guidelines for Iniang and Monitoring Asthma Treatment?",
    up: 2,
    down: 3,
  },
];

type SessionQuestionsCardProps = {
  title?: string;
  showQuestionNav?: boolean;
  eventId?: string;
  sessionId?: string;
};

export function SessionQuestionsCard({
  title = "Session Questions",
  showQuestionNav = false,
  eventId,
  sessionId,
}: SessionQuestionsCardProps) {
  const live = Boolean(eventId?.trim() && sessionId?.trim());
  const eid = eventId?.trim() ?? "";
  const sid = sessionId?.trim() ?? "";

  const { items: rtdbItems, loading, error } = useSessionQuestionsRtdb(
    live ? sid : null,
    live ? eid : null,
  );

  const items: QuestionItem[] = live
    ? rtdbItems.map((r) => ({
        _id: r._id,
        author: r.author,
        text: r.text,
        up: r.up,
        down: r.down,
      }))
    : sample;

  const total = items.length;
  const [index, setIndex] = useState(0);
  const [askModalOpen, setAskModalOpen] = useState(false);

  useEffect(() => {
    if (index >= total && total > 0) setIndex(0);
    else if (total === 0) setIndex(0);
  }, [total, index]);

  const goNext = useCallback(() => {
    if (total <= 0) return;
    setIndex((i) => (i + 1) % total);
  }, [total]);

  const goPrev = useCallback(() => {
    if (total <= 0) return;
    setIndex((i) => (i - 1 + total) % total);
  }, [total]);

  useEffect(() => {
    if (total <= 1) return;
    const id = window.setInterval(goNext, 2000);
    return () => window.clearInterval(id);
  }, [total, goNext]);

  const safeIndex = total > 0 ? Math.min(index, total - 1) : 0;
  const current = total > 0 ? items[safeIndex] : null;

  const viewAllTo =
    live ? `/questions?event_id=${encodeURIComponent(eid)}&session_id=${encodeURIComponent(sid)}` : null;

  return (
    <section
      className="relative z-10 flex w-full max-w-none flex-col gap-4 rounded-lg border border-[rgba(116,112,112,0.2)] bg-whit card-bg py-4 shadow-sm"
      data-name="Session Questions"
    >
      <div className="flex h-8 items-center justify-between gap-2 px-4">
        <div className="flex min-w-0 flex-1 items-center gap-2">
          <h2 className="truncate text-lg font-semibold tracking-wide text-[#24282f]">
            {title}
          </h2>
          {total > 0 ? (
            <span className="shrink-0 rounded bg-[#e5e5ea] px-2 py-0.5 text-[10px] tracking-wide text-[#24282f]">
              {safeIndex + 1}/{total}
            </span>
          ) : null}
        </div>
        {showQuestionNav && total > 1 ? (
          <div className="flex shrink-0 gap-1">
            <button
              type="button"
              className="rounded-full bg-[#f2f2f7] p-1"
              aria-label="Previous question"
              onClick={goPrev}
            >
              <ChevronLeft className="size-4 text-[#24282f]" />
            </button>
            <button
              type="button"
              className="rounded-full bg-[#f2f2f7] p-1"
              aria-label="Next question"
              onClick={goNext}
            >
              <ChevronRight className="size-4 text-[#24282f]" />
            </button>
          </div>
        ) : null}
      </div>
      <div className="border-t border-[#f2f2f7]">
        {live && loading ? (
          <p className="px-4 py-6 text-center text-sm text-[rgba(36,40,47,0.55)]">Loading questions…</p>
        ) : live && error ? (
          <p className="px-4 py-6 text-center text-sm text-red-600">{error}</p>
        ) : current ? (
          <div className="p-0">
            <AudienceQuestionCard
              key={current._id ?? `${safeIndex}-${current.text.slice(0, 24)}`}
              item={current}
              variant="embedded"
              voteContext={live ? { eventId: eid, sessionId: sid } : undefined}
            />
          </div>
        ) : (
          <p className="px-4 py-6 text-center text-sm text-[rgba(36,40,47,0.55)]">No questions yet.</p>
        )}
      </div>
      <div className="flex items-center justify-between gap-3 px-4">
        {viewAllTo ? (
          <Link
            to={viewAllTo}
            className="font-inter text-xs font-semibold uppercase tracking-wider text-[#1e72e theme-btn-link"
          >
            View All
          </Link>
        ) : (
          <span className="font-inter text-xs font-semibold uppercase tracking-wider text-[rgba(36,40,47,0.35)]">
            View All
          </span>
        )}
        <button
          type="button"
          onClick={() => live && setAskModalOpen(true)}
          disabled={!live}
          className="shrink-0 rounded-lg bg-[#ef8d1 bg-[var(--theme-button-color)] px-3 py-2 text-xs font-semibold text-white shadow-[0_2px_4px_rgba(0,0,0,0.1)] transition-all duration-300 ease-in-out hover:bg-[#e0800c] transition hover:bg-[var(--theme-button-color)]/90 disabled:opacity-50"
        >
          Ask your Question
        </button>
      </div>

      {live ? (
        <AskQuestionModal
          open={askModalOpen}
          onClose={() => setAskModalOpen(false)}
          eventId={eid}
          sessionId={sid}
          idSuffix="-card"
        />
      ) : null}
    </section>
  );
}