using IM.DomainCommons;
using MessageService.Domain.Enums;
using MessageService.Domain.Events;
using MessageService.Domain.Tools;

namespace MessageService.Domain.Entities
{
    public class Conversation : AggregateRootEntity
    {
        /// <summary>
        /// 用户
        /// </summary>
        public Guid UserId { get; private set; }

        /// <summary>
        /// 对方ID（群聊为群聊ID，单聊为单聊ID）	
        /// </summary>
        public Guid TargetId { get; private set; }
        public string TargetAvatar { get; private set; }
        public string TargetName { get; private set; }

        /// <summary>
        /// 最后一条未读消息ID	
        /// </summary>
        public long? LastReadSequenceId { get; private set; }

        /// <summary>
        /// 未读消息数	
        /// </summary>
        public int UnreadCount { get; private set; }

        public ChatType ChatType { get; private set; }

        /// <summary>
        /// 消息推送唯一标识符
        /// </summary>
        public string StreamKey { get; private set; }

        /// <summary>
        /// 最后一条最新消息
        /// </summary>
        public string LastMessage { get; private set; }
        private Conversation() { }

        public Conversation(Guid userId, Guid targetId, string targetAvatar, string targetName, long? lastReadSequenceId, int unreadCount, ChatType chatType, string lastMessage)
        {
            UserId = userId;
            TargetId = targetId;
            TargetAvatar = targetAvatar;
            TargetName = targetName;
            LastReadSequenceId = lastReadSequenceId;
            UnreadCount = unreadCount;
            ChatType = chatType;
            LastMessage = lastMessage;
            ModificationTime = DateTime.Now;
            StreamKey = ChatType == ChatType.GROUP ? StreamKeyBuilder.Group(targetId) : StreamKeyBuilder.Private(userId, targetId);
            AddDomainEvent(new ConversationCreatedDomainEvent(this));
        }

        public void Update(long? LastReadSequenceId = default, int? unreadCount = default, string? lastMsg = default)
        {
            if (LastReadSequenceId != null)
            {
                LastReadSequenceId = LastReadSequenceId.Value;
                this.NotifyModified();
            }
            if (unreadCount != null)
            {
                UnreadCount += unreadCount.Value;
                NotifyModified();
            }

            if (lastMsg != null)
            {
                LastMessage = lastMsg;
                NotifyModified();
            }
        }


        /// <summary>
        /// 标记会话已读（清零未读数，更新最后已读消息序列号）
        /// </summary>
        public void MarkAsRead(long? lastReadSequenceId)
        {
            UnreadCount = 0;
            if (lastReadSequenceId.HasValue)
                LastReadSequenceId = lastReadSequenceId.Value;
        }

        public void UpdateProfile(string name, string avatar)
        {
            TargetAvatar = avatar;
            TargetName = name;
        }


    }
}