using AutoMapper;
using IM_API.Application.Interfaces;
using IM_API.Domain.Events;
using IM_API.Dtos;
using IM_API.Exceptions;
using IM_API.Interface.Services;
using IM_API.Models;
using IM_API.Services;
using IM_API.Tools;
using Microsoft.EntityFrameworkCore;
using Newtonsoft.Json;

namespace IM_API.Application.EventHandlers
{
    public class ConversationEventHandler : IEventHandler<MessageCreatedEvent>
    {
        private readonly IConversationService _conversationService;
        private readonly ILogger<ConversationEventHandler> _logger;
        private readonly ImContext _context;
        private readonly IMapper _mapper;
        public ConversationEventHandler(
            IConversationService conversationService,
            ILogger<ConversationEventHandler> logger,
            ImContext imContext,
            IMapper mapper
            )
        {
            _conversationService = conversationService;
            _logger = logger;
            _context = imContext;
            _mapper = mapper;
        }
        public async Task Handle(MessageCreatedEvent @event)
        {
            if(@event.ChatType == ChatType.PRIVATE)
            {
                Conversation? userAConversation = await _context.Conversations.FirstOrDefaultAsync(
                    x => x.UserId == @event.MsgSenderId && x.TargetId == @event.MsgRecipientId
                    );
                Conversation? userBConversation = await _context.Conversations.FirstOrDefaultAsync(
                    x => x.UserId == @event.MsgRecipientId && x.TargetId == @event.MsgSenderId
                    );
                if(userAConversation is null || userBConversation is null)
                {
                    _logger.LogError("消息事件更新会话信息失败：{@event}",@event);
                }
                userAConversation.LastMessage = @event.MessageContent;
                userAConversation.LastReadMessageId = @event.MessageId;
                userBConversation.LastMessage = @event.MessageContent;
                userBConversation.UnreadCount += 1;
                _context.UpdateRange(userAConversation,userBConversation);
                await _context.SaveChangesAsync();
            }
        }
    }
}