"use client";

import { useState, useCallback, useRef, useEffect } from "react";
import {
  MatchmakingManager,
  type MatchFoundData,
} from "@/lib/game/matchmaking";

/** The current phase of the matchmaking flow. */
export type MatchmakingState = "idle" | "searching" | "found" | "error";

/**
 * React hook that wraps `MatchmakingManager` with component-friendly state.
 *
 * Returns reactive `state`, `playerCount`, `matchData`, and `error` values
 * alongside `startSearching` / `cancelSearch` actions.
 *
 * Automatically cleans up the matchmaking channel on unmount.
 */
export function useMatchmaking(
  playerId: string,
  playerName: string,
  playerElo: number,
) {
  const [state, setState] = useState<MatchmakingState>("idle");
  const [playerCount, setPlayerCount] = useState(0);
  const [matchData, setMatchData] = useState<MatchFoundData | null>(null);
  const [error, setError] = useState<string | null>(null);
  const managerRef = useRef<MatchmakingManager | null>(null);

  const startSearching = useCallback(async () => {
    setState("searching");
    setError(null);

    const manager = new MatchmakingManager(playerId, playerName, playerElo);
    managerRef.current = manager;

    await manager.joinQueue({
      onPlayerCount: setPlayerCount,
      onMatchFound: (data) => {
        setState("found");
        setMatchData(data);
      },
      onError: (err) => {
        setState("error");
        setError(err);
      },
    });
  }, [playerId, playerName, playerElo]);

  const cancelSearch = useCallback(async () => {
    if (managerRef.current) {
      await managerRef.current.leaveQueue();
      managerRef.current = null;
    }
    setState("idle");
    setMatchData(null);
  }, []);

  // Cleanup on unmount
  useEffect(() => {
    return () => {
      managerRef.current?.leaveQueue();
    };
  }, []);

  return { state, playerCount, matchData, error, startSearching, cancelSearch };
}