package cn.teammodel.service.impl;

import cn.teammodel.ai.SparkGptClient;
import cn.teammodel.ai.SseHelper;
import cn.teammodel.ai.cache.HistoryCache;
import cn.teammodel.ai.domain.SparkChatRequestParam;
import cn.teammodel.ai.listener.SparkGptStreamListener;
import cn.teammodel.common.ErrorCode;
import cn.teammodel.common.PK;
import cn.teammodel.config.exception.ServiceException;
import cn.teammodel.model.entity.ai.ChatApp;
import cn.teammodel.repository.ChatAppRepository;
import cn.teammodel.repository.ChatSessionRepository;
import cn.teammodel.model.dto.ai.ChatCompletionReqDto;
import cn.teammodel.model.entity.User;
import cn.teammodel.model.entity.ai.ChatSession;
import cn.teammodel.security.utils.SecurityUtil;
import cn.teammodel.service.ChatMessageService;
import cn.teammodel.utils.RepositoryUtil;
import com.azure.cosmos.models.CosmosPatchOperations;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.ObjectUtils;
import org.apache.commons.lang3.StringUtils;
import org.springframework.stereotype.Service;
import org.springframework.web.servlet.mvc.method.annotation.SseEmitter;

import javax.annotation.Resource;
import java.time.Instant;
import java.util.ArrayList;
import java.util.List;

/**
 * @author winter
 * @create 2023-12-18 15:20
 */
@Service
@Slf4j
public class ChatMessageServiceImpl implements ChatMessageService {
    @Resource
    private SparkGptClient sparkGptClient;
    @Resource
    private ChatSessionRepository chatSessionRepository;
    @Resource
    private ChatAppRepository chatAppRepository;


    @Override
    public SseEmitter chatCompletion(ChatCompletionReqDto chatCompletionReqDto) {
        // 目前仅使用讯飞星火大模型
        String appId = chatCompletionReqDto.getAppId();
        SseEmitter sseEmitter;
        if (StringUtils.isEmpty(appId)) {
            sseEmitter = completionBySession(chatCompletionReqDto);
        } else {
            sseEmitter = completionByApp(chatCompletionReqDto, false);
        }
        return sseEmitter;
    }

    /**
    * 面具模式(暂时不存储聊天记录)
    */
    private SseEmitter completionByApp(ChatCompletionReqDto chatCompletionReqDto, boolean justApi) {
        String appId = chatCompletionReqDto.getAppId();
        String userPrompt = chatCompletionReqDto.getText();
        User user = SecurityUtil.getLoginUser();
        String userId = user.getId();
        String schoolId = user.getSchoolId();

        // 查询 appId 获取 prompt
        // 通过 prompt 和 userprompt 生成结果
        // 直接返回
        ChatApp chatApp = RepositoryUtil.findOne(chatAppRepository.findByAppId(appId), "该应用不存在");
        // 检验 app 是否可以被该用户使用
        if (!schoolId.equals(chatApp.getSchoolId()) && !"public".equals(chatApp.getSchoolId())) {
            throw new ServiceException(ErrorCode.NO_AUTH_ERROR.getCode(), "无权使用该应用");
        }

        String appPrompt = chatApp.getPrompt();
        SseEmitter sseEmitter = new SseEmitter(-1L);
        SparkGptStreamListener listener = new SparkGptStreamListener(sseEmitter);
        // open 回调
        listener.setOnOpen((s) -> {
            // 敏感词检查,计费 (设计模型, reducePoints, 或者都可以在完成的回调中做?)
            log.info("callback: ws open event emmit");
        });
        // 对话完成的回调
        listener.setOnComplete((s) -> {
            log.info("callback: ws complete event emmit");
            SseHelper.send(sseEmitter, "[DONE]");
            // 处理完成后的事件:
            if (!justApi) {
                // 保存消息记录, 缓存更改
            }
        });
        // 错误的回调
        listener.setOnError((s) -> {
            log.error("callback: ws error, info: " + s);
            // 返还积分
        });
        List<SparkChatRequestParam.Message> messageList = new ArrayList<>();
        messageList.add(SparkChatRequestParam.Message.ofAssistant(appPrompt));
        messageList.add(SparkChatRequestParam.Message.ofUser(userPrompt));
        SparkChatRequestParam requestParam = SparkChatRequestParam
                .builder()
                .uid(userId)
                .chatId(appId)
                .messageList(messageList)
                .build();
        sparkGptClient.streamChatCompletion(requestParam, listener);
        return sseEmitter;
    }

    /**
    * 会话模式
    */
    private SseEmitter completionBySession(ChatCompletionReqDto chatCompletionReqDto) {
//        User user = SecurityUtil.getLoginUser();
//        String userId = user.getId();
        String userId = "1595321354";
        String userPrompt = chatCompletionReqDto.getText();
        String sessionId = chatCompletionReqDto.getSessionId();

        ChatSession session = RepositoryUtil.findOne(chatSessionRepository.findBySessionId(sessionId), "该会话不存在");
        if (!session.getUserId().equals(userId)) {
            throw new ServiceException(ErrorCode.NO_AUTH_ERROR.getCode(), "该会话不存在");
        }

        SseEmitter sseEmitter = new SseEmitter(-1L);
        SparkGptStreamListener listener = new SparkGptStreamListener(sseEmitter);
        // open 回调
        listener.setOnOpen((s) -> {
            // 敏感词检查,计费 (设计模型, reducePoints, 或者都可以在完成的回调中做?)
            log.info("callback: ws open event emmit");
        });
        // 对话完成的回调
        listener.setOnComplete((s) -> {
            log.info("callback: ws complete event emmit");
            SseHelper.send(sseEmitter, "[DONE]");
            // 处理完成后的事件: 保存消息记录, 缓存更改
            ChatSession.Message message = ChatSession.Message.of(userPrompt, s);
            HistoryCache.updateContext(sessionId, message);
            CosmosPatchOperations options = CosmosPatchOperations.create()
                    .replace("/updateTime", Instant.now().toEpochMilli())
                    .add("/history/-", message);
            chatSessionRepository.save(sessionId, PK.of(PK.CHAT_SESSION), ChatSession.class, options);
        });
        // 错误的回调
        listener.setOnError((s) -> {
            log.error("callback: ws error, info: " + s);
            // 返还积分
        });
        List<SparkChatRequestParam.Message> messageList = fetchContext(sessionId, userPrompt);
        SparkChatRequestParam requestParam = SparkChatRequestParam
                .builder()
                .uid(userId)
                .chatId(sessionId)
                .messageList(messageList)
                .build();
        sparkGptClient.streamChatCompletion(requestParam, listener);
        return sseEmitter;
    }

    List<SparkChatRequestParam.Message> fetchContext(String sessionId, String prompt) {
        List<ChatSession.Message> context = HistoryCache.getContext(sessionId);
        List<SparkChatRequestParam.Message> paramMessages = new ArrayList<>();
        // 暂未缓存,从数据库拉取
        if (ObjectUtils.isEmpty(context)) {
            context = chatSessionRepository.findLatestMessage(sessionId);

            if (ObjectUtils.isNotEmpty(context)) {
                HistoryCache.putContext(sessionId, context);
            }
        }

        // convert DB Message to Spark Message
        context.forEach(item -> {
            paramMessages.add(SparkChatRequestParam.Message.ofUser(item.getUserText()));
            paramMessages.add(SparkChatRequestParam.Message.ofAssistant(item.getGptText()));
        });
        paramMessages.add(SparkChatRequestParam.Message.ofUser(prompt));
        return paramMessages;
    }
}