"use client";

import { AnimatePresence, motion } from "framer-motion";
import { Crown, Loader2 } from "lucide-react";
import { useEffect, useState } from "react";
import { ScreenShell } from "@/components/online/ScreenHeader";
import { Avatar } from "@/components/online/Avatar";
import { useGameStore } from "@/lib/game-store";
import { useOnlineStore } from "@/lib/online-store";
import { useSessionStore } from "@/lib/session-store";
import { useUIStore } from "@/lib/ui-store";
import { useI18n } from "@/lib/i18n";
import { getService } from "@/lib/online/service";

export function MatchmakingScreen() {
  const { t } = useI18n();
  const mm = useOnlineStore((s) => s.matchmaking);
  const cancelMatchmaking = useOnlineStore((s) => s.cancelMatchmaking);
  const newOnlineMatch = useGameStore((s) => s.newOnlineMatch);
  const enterServerMatch = useGameStore((s) => s.enterServerMatch);
  const upgradePlan = useSessionStore((s) => s.upgradePlan);
  const goGame = useUIStore((s) => s.goGame);
  const go = useUIStore((s) => s.go);

  const ready = mm.phase === "ready";
  const queued = mm.phase === "queued";
  const searching = mm.phase === "searching";
  const slots = [0, 1, 2, 3];

  // Elapsed seconds while searching (resets when the search (re)starts).
  const [elapsed, setElapsed] = useState(0);
  useEffect(() => {
    if (!searching) {
      setElapsed(0);
      return;
    }
    const id = setInterval(() => setElapsed((s) => s + 1), 1000);
    return () => clearInterval(id);
  }, [searching]);

  // Live server: the server starts the match itself — auto-enter when ready.
  useEffect(() => {
    if (mm.phase === "ready" && getService().live) {
      enterServerMatch(getService());
      goGame("home");
    }
  }, [mm.phase, enterServerMatch, goGame]);

  const cancel = async () => {
    await cancelMatchmaking();
    go("online");
  };

  const enter = () => {
    const players = getService().getMatchPlayers();
    if (!players) return;
    newOnlineMatch({
      players: players.map((p) => ({
        displayName: p.displayName,
        avatar: p.avatar,
        level: p.level,
      })),
      targetScore: 7,
      stake: mm.stake,
      ranked: mm.ranked,
    });
    goGame("home");
  };

  if (queued) {
    return (
      <ScreenShell hideNav>
        <div className="flex flex-col items-center justify-center min-h-[80dvh] text-center">
          <div className="text-5xl mb-4">⏳</div>
          <h1 className="gold-text text-2xl font-black">{t("queue.title")}</h1>
          <p className="text-cream/60 text-sm mt-1">{t("queue.busy")}</p>
          <div className="my-6 text-7xl font-black gold-text tabular-nums">
            {mm.queuePosition ?? 0}
          </div>
          <p className="text-cream/70">{t("queue.position", { n: mm.queuePosition ?? 0 })}</p>

          <div className="mt-9 flex flex-col items-center gap-3 w-full max-w-xs">
            <button
              onClick={() => upgradePlan()}
              className="press-3d btn-gold w-full rounded-2xl py-3 flex items-center justify-center gap-2"
            >
              <Crown className="size-4" />
              {t("queue.upgrade")}
            </button>
            <span className="text-[11px] text-cream/45">{t("queue.skip")}</span>
            <button
              onClick={cancel}
              className="glass rounded-xl px-6 py-2.5 text-cream/70 hover:text-cream"
            >
              {t("mm.cancel")}
            </button>
          </div>
        </div>
      </ScreenShell>
    );
  }

  return (
    <ScreenShell hideNav>
      <div className="flex flex-col items-center justify-center min-h-[80dvh] text-center">
        <motion.div
          animate={ready ? {} : { rotate: 360 }}
          transition={{ repeat: ready ? 0 : Infinity, duration: 2, ease: "linear" }}
          className="mb-6"
        >
          {ready ? (
            <span className="text-5xl">✅</span>
          ) : (
            <Loader2 className="size-12 text-gold-400" />
          )}
        </motion.div>

        <h1 className="gold-text text-2xl font-black">
          {ready ? t("mm.ready") : mm.phase === "found" ? t("mm.found") : t("mm.searching")}
        </h1>

        {searching && (
          <>
            <div className="mt-2 text-3xl font-black gold-text tabular-nums">{elapsed}s</div>
            <p className="text-cream/50 text-xs mt-1 max-w-[16rem]">{t("mm.fillHint")}</p>
          </>
        )}

        <div className="grid grid-cols-4 gap-2 sm:gap-3 mt-8 w-full max-w-xs">
          {slots.map((i) => {
            const p = mm.players[i];
            return (
              <div
                key={i}
                className={
                  "h-20 w-full rounded-2xl flex flex-col items-center justify-center gap-1 transition " +
                  (p ? "glass gold-border" : "border border-dashed border-navy-700/60 bg-navy-900/30")
                }
              >
                <AnimatePresence mode="wait">
                  {p ? (
                    <motion.div
                      key={p.id}
                      initial={{ scale: 0, opacity: 0 }}
                      animate={{ scale: 1, opacity: 1 }}
                      transition={{ type: "spring", stiffness: 260, damping: 18 }}
                      className="flex flex-col items-center gap-0.5"
                    >
                      <span className="grid size-9 place-items-center rounded-xl bg-navy-900 overflow-hidden">
                        <Avatar id={p.avatar} size={24} />
                      </span>
                      <span className="text-[9px] text-cream/80 max-w-14 truncate">
                        {p.displayName}
                      </span>
                      <span className="text-[8px] text-gold-400/80">
                        {t("common.level")} {p.level}
                      </span>
                    </motion.div>
                  ) : (
                    <motion.span
                      key="empty"
                      className="text-cream/20 text-2xl"
                      animate={{ opacity: [0.2, 0.5, 0.2] }}
                      transition={{ repeat: Infinity, duration: 1.4 }}
                    >
                      ?
                    </motion.span>
                  )}
                </AnimatePresence>
              </div>
            );
          })}
        </div>

        <div className="mt-10 flex gap-3">
          <button onClick={cancel} className="press-3d glass rounded-2xl px-6 py-3 text-cream/70">
            {t("mm.cancel")}
          </button>
          {ready && (
            <motion.button
              initial={{ scale: 0.8, opacity: 0 }}
              animate={{ scale: 1, opacity: 1 }}
              onClick={enter}
              className="press-3d btn-gold rounded-2xl px-8 py-3 text-lg"
            >
              {t("mm.start")}
            </motion.button>
          )}
        </div>
      </div>
    </ScreenShell>
  );
}