"use client";

import { useMemo, useState, useEffect } from "react";
import Link from "next/link";
import { api } from "@/lib/api";
import { useToast } from "@/lib/toast";
import { useAuth } from "@/lib/auth";
import { useI18n } from "@/lib/i18n";
import type { Meetup } from "@/lib/types";
import NewsletterSubscribe from "@/components/NewsletterSubscribe";
import RingNext from "@/components/RingNext";
import { useRingSteps } from "@/lib/rings";

const MODE_LABELS: Record<string, string> = {
  online: "💻 线上",
  offline: "📍 线下",
  hybrid: "🔀 混合",
};

interface Props {
  meetups: Meetup[];
}

export default function MeetupsClient({ meetups }: Props) {
  const { t } = useI18n();
  const rings = useRingSteps();
  const { toast } = useToast();
  const { token } = useAuth();
  const [mode, setMode] = useState<"all" | Meetup["mode"]>("all");
  const [rsvpIds, setRsvpIds] = useState<Set<string>>(new Set());

  useEffect(() => {
    if (!token) return;
    api.getMyRsvps(token).then((r) => setRsvpIds(new Set(r.ids))).catch(() => {});
  }, [token]);

  const filtered = useMemo(() => {
    if (mode === "all") return meetups;
    return meetups.filter((m) => m.mode === mode);
  }, [meetups, mode]);

  const handleRsvp = async (meetup: Meetup) => {
    if (rsvpIds.has(meetup.id)) {
      toast(t.meetups.alreadyRsvp, "info");
      return;
    }
    try {
      const res = await api.rsvpMeetup(meetup.id, undefined, token || undefined);
      const next = new Set(rsvpIds).add(meetup.id);
      setRsvpIds(next);
      toast(res.message || t.meetups.rsvpOk, "success");
    } catch {
      toast(t.meetups.rsvpFail, "error");
    }
  };

  return (
    <div className="meetups-page">
      <div className="container">
        <nav className="detail-nav">
          <Link href="/">{t.common.backHome}</Link>
          <span> · </span>
          <Link href="/community">{t.nav.community}</Link>
        </nav>

        <div className="section-header reveal">
          <span className="section-tag">{t.meetups.tag}</span>
          <h1>{t.meetups.title}</h1>
          <p>{t.meetups.subtitle}</p>
        </div>

        <div className="meetups-toolbar reveal">
          <Link href="/meetups/host" className="btn btn-primary btn-sm">{t.meetups.hostBtn}</Link>
          {(["all", "online", "offline", "hybrid"] as const).map((m) => (
            <button
              key={m}
              type="button"
              className={`filter-btn${mode === m ? " active" : ""}`}
              onClick={() => setMode(m)}
            >
              {m === "all" ? t.meetups.all : MODE_LABELS[m]}
            </button>
          ))}
        </div>

        <div className="meetups-grid">
          {filtered.map((m) => (
            <article key={m.id} className="meetup-card reveal">
              <div className="meetup-card-top">
                <span className="meetup-emoji">{m.emoji}</span>
                <div>
                  <h3>{m.title}</h3>
                  <p className="meetup-meta">
                    {MODE_LABELS[m.mode]} · {m.city} · {m.date} {m.time}
                  </p>
                </div>
              </div>
              <p className="meetup-desc">{m.description}</p>
              <p className="meetup-venue">📍 {m.venue}</p>
              <div className="meetup-tags">
                {m.tags.map((tag) => (
                  <span key={tag} className="meetup-tag">{tag}</span>
                ))}
              </div>
              <footer className="meetup-footer">
                <span>
                  {m.rsvp_count}/{m.max_attendees} {t.meetups.rsvp}
                </span>
                <span>{m.organizer}</span>
                <div className="meetup-footer-actions">
                  {(m.mode === "online" || m.mode === "hybrid") && (
                    <Link href={`/meetups/${m.id}/live`} className="btn btn-sm meetup-live-btn">
                      {t.meetups.liveBtn}
                    </Link>
                  )}
                  <button
                    type="button"
                    className={`btn btn-primary btn-sm${rsvpIds.has(m.id) ? " is-done" : ""}`}
                    onClick={() => handleRsvp(m)}
                    disabled={rsvpIds.has(m.id)}
                  >
                    {rsvpIds.has(m.id) ? t.meetups.rsvpDone : t.meetups.rsvpBtn}
                  </button>
                </div>
              </footer>
              {m.destination_slug && (
                <Link href={`/destinations/${m.destination_slug}`} className="meetup-city-link">
                  {t.meetups.viewCity} →
                </Link>
              )}
            </article>
          ))}
        </div>

        {filtered.length === 0 && (
          <p className="dest-empty">{t.meetups.empty}</p>
        )}

        <NewsletterSubscribe source="meetups" />
        <RingNext steps={rings.afterMeetups} />
      </div>
    </div>
  );
}