"use client";

import { useEffect, useState } from "react";
import {
  getStoredPlayer,
  storePlayer,
  type StoredPlayer,
} from "@/lib/player-store";
import { isSupabaseConfigured } from "@/lib/supabase/client";
import { getOrCreatePlayer, recordPlayerVisit } from "@/lib/supabase/queries";

/**
 * Hook that ensures the locally-stored player has a real Supabase UUID.
 *
 * On mount it reads the player from localStorage. If the player exists but
 * has an empty `id` and Supabase is configured, it calls
 * `getOrCreatePlayer(anonymousId, displayName)` and updates localStorage
 * with the returned UUID.
 *
 * @returns `{ player, isLoading }` -- player may be null if none is stored,
 * and isLoading is true while the Supabase sync is in-flight.
 */
export function usePlayerSync(): {
  player: StoredPlayer | null;
  isLoading: boolean;
} {
  const [player, setPlayer] = useState<StoredPlayer | null>(null);
  const [isLoading, setIsLoading] = useState(true);

  useEffect(() => {
    let cancelled = false;

    async function sync() {
      const stored = getStoredPlayer();

      if (!stored) {
        setIsLoading(false);
        return;
      }

      setPlayer(stored);

      // Always verify player exists in DB -- heals stale/reset UUIDs in localStorage
      if (!isSupabaseConfigured) {
        setIsLoading(false);
        return;
      }

      try {
        const dbPlayer = await getOrCreatePlayer(
          stored.anonymousId,
          stored.displayName
        );

        if (cancelled) return;

        if (dbPlayer) {
          const synced: StoredPlayer = {
            ...stored,
            id: dbPlayer.id,
          };
          storePlayer(synced);
          setPlayer(synced);
          // Record this session visit in the background
          recordPlayerVisit(dbPlayer.id).catch(() => {});
        }
      } catch (err) {
        console.error("[usePlayerSync] failed to sync player:", err);
      } finally {
        if (!cancelled) {
          setIsLoading(false);
        }
      }
    }

    sync();

    return () => {
      cancelled = true;
    };
  }, []);

  return { player, isLoading };
}