using System.Collections.Generic;
using System.Threading.Tasks;

namespace LiveForum.IService.Posts
{
    /// <summary>
    /// 点赞服务接口
    /// </summary>
    public interface ILikeService
    {
        /// <summary>
        /// 查询是否已点赞（优先Redis，再查数据库）
        /// </summary>
        /// <param name="userId">用户ID</param>
        /// <param name="targetType">目标类型：1-帖子，2-评论</param>
        /// <param name="targetId">目标ID</param>
        /// <returns>是否已点赞</returns>
        Task<bool> IsLikedAsync(long userId, int targetType, long targetId);

        /// <summary>
        /// 获取点赞数（优先Redis，再查数据库）
        /// </summary>
        /// <param name="targetType">目标类型：1-帖子，2-评论</param>
        /// <param name="targetId">目标ID</param>
        /// <returns>点赞数</returns>
        Task<int> GetLikeCountAsync(int targetType, long targetId);

        /// <summary>
        /// 批量查询点赞状态
        /// </summary>
        /// <param name="userId">用户ID</param>
        /// <param name="targetType">目标类型：1-帖子，2-评论</param>
        /// <param name="targetIds">目标ID列表</param>
        /// <returns>目标ID到是否点赞的映射</returns>
        Task<Dictionary<long, bool>> BatchIsLikedAsync(long userId, int targetType, List<long> targetIds);

        /// <summary>
        /// 批量查询点赞数
        /// </summary>
        /// <param name="targetType">目标类型：1-帖子，2-评论</param>
        /// <param name="targetIds">目标ID列表</param>
        /// <returns>目标ID到点赞数的映射</returns>
        Task<Dictionary<long, int>> BatchGetLikeCountAsync(int targetType, List<long> targetIds);

        /// <summary>
        /// 执行点赞操作（Redis+队列）
        /// </summary>
        /// <param name="userId">用户ID</param>
        /// <param name="targetType">目标类型：1-帖子，2-评论</param>
        /// <param name="targetId">目标ID</param>
        /// <param name="receiverId">接收者ID（用于消息通知）</param>
        /// <returns>是否操作成功</returns>
        Task<bool> LikeAsync(long userId, int targetType, long targetId, long receiverId);

        /// <summary>
        /// 执行取消点赞操作（Redis+队列）
        /// </summary>
        /// <param name="userId">用户ID</param>
        /// <param name="targetType">目标类型：1-帖子，2-评论</param>
        /// <param name="targetId">目标ID</param>
        /// <returns>是否操作成功</returns>
        Task<bool> UnlikeAsync(long userId, int targetType, long targetId);
    }
}