ANTOOZA-BACKEND/Application/Helpers/ChatRoomConfigLoader.cs

using Application.Abstractions.Cache;
using Application.Abstractions.Chat;
using Application.Abstractions.Data;
using Microsoft.EntityFrameworkCore;

namespace Application.Helpers;

/// <summary>
/// ChatRoomConfig 로더 — Redis 캐시(60초 TTL) → MSSQL 폴백.
/// 오픈 판정: main 은 row 없어도 기본 오픈, 종목방은 row 존재 + IsActive 필요(단계 오픈 — d0 §5-④),
/// 레거시 channel:{sid} 룸은 항상 통과(기존 채널 채팅 동작 유지).
/// </summary>
public static class ChatRoomConfigLoader
{
    public sealed record RoomConfig(bool Exists, bool IsActive, short SlowModeSeconds, string? Notice);

    private static readonly TimeSpan CacheTtl = TimeSpan.FromSeconds(60);

    public static async Task<RoomConfig> GetAsync(ICacheService cache, IAppDbContext db, string roomKey, CancellationToken ct)
    {
        var cacheKey = CacheKeys.ChatRoomConfig(roomKey);
        var cached = await cache.GetAsync<RoomConfig>(cacheKey);
        if (cached is not null)
        {
            return cached;
        }

        var row = await db.ChatRoomConfig.AsNoTracking().Where(c => c.RoomKey == roomKey).Select(c => new { c.IsActive, c.SlowModeSeconds, c.Notice }).FirstOrDefaultAsync(ct);

        var config = row is null
            ? new RoomConfig(false, false, 0, null)
            : new RoomConfig(true, row.IsActive, row.SlowModeSeconds, row.Notice);

        await cache.SetAsync(cacheKey, config, CacheTtl);
        return config;
    }

    public static bool IsRoomOpen(string roomKey, RoomConfig config)
    {
        if (roomKey == ChatRoomKeys.Main)
        {
            return !config.Exists || config.IsActive;
        }

        if (ChatRoomKeys.IsStockRoom(roomKey))
        {
            return config.Exists && config.IsActive;
        }

        return true;
    }
}