import type {
  IChatWithLLMRequest,
  ModelInfo,
  ModelListInfo,
  UsageInfo
} from "@/interfaces";
import { ChatService } from "@/services";

export const useChatStore = defineStore("chat", () => {
  const token = "sk-fkGVZBrAqvIxLjlF3b5f19EfBb63486c90Fa5a1fBd7076Ee";
  // 默认模型
  const modelInfo = ref<ModelInfo | null>(null);
  // 历史消息
  const historyMessages = ref<IChatWithLLMRequest["messages"]>([]);
  // 是否正在响应
  const completing = ref<boolean>(false);
  // 是否正在思考
  const thinking = ref<boolean>(false);
  // 在线人数
  const onlineCount = ref<number>(0);

  // 与 LLM 聊天
  const chatWithLLM = async (
    request: IChatWithLLMRequest,
    onProgress: (content: string) => void, // 接收内容进度回调
    getUsageInfo: (object: UsageInfo) => void = () => {}, // 接收使用信息回调
    getThinking: (thinkingContent: string) => void = () => {} // 接收思维链内容回调
  ) => {
    if (completing.value) throw new Error("正在响应中");

    completing.value = true; // 开始请求
    try {
      await ChatService.ChatWithLLM(
        token,
        request,
        (content) => {
          onProgress(content);
        },
        (object: UsageInfo) => {
          getUsageInfo(object);
        },
        (thinkingContent: string) => {
          getThinking(thinkingContent);
        }
      );
    } catch (error) {
      console.error("请求失败:", error);
    } finally {
      completing.value = false;
    }
  };

  // 添加消息到历史记录
  const addMessageToHistory = (message: string) => {
    const content = message.trim();
    if (!content) return;

    historyMessages.value.push({
      role: "user",
      content
    });
  };

  // 清除历史消息
  const clearHistoryMessages = () => {
    historyMessages.value = [];
  };

  // 确保最后一条消息是助手消息，如果最后一条消息不是，就加一条空的占位，不然后面的思维链会丢失
  const ensureAssistantMessage = () => {
    if (
      historyMessages.value.length === 0 ||
      historyMessages.value[historyMessages.value.length - 1].role !==
        "assistant"
    ) {
      historyMessages.value.push({
        role: "assistant",
        content: ""
      });
    }
  };

  watch(
    historyMessages,
    (newVal) => {
      // 当历史消息变化时，发送请求
      if (newVal.length > 0) {
        const lastMessage = newVal[newVal.length - 1];
        if (lastMessage.role === "user" && modelInfo.value) {
          chatWithLLM(
            {
              messages: newVal,
              model: modelInfo.value?.model_id
            },
            // 处理进度回调,文本
            (content) => {
              ensureAssistantMessage();
              thinking.value = false;
              historyMessages.value[historyMessages.value.length - 1].content =
                content;
            },
            // 处理使用usage信息回调
            (usageInfo: UsageInfo) => {
              // 如果最后一条消息是助手的回复，则更新使用信息
              if (
                historyMessages.value.length > 0 &&
                historyMessages.value[historyMessages.value.length - 1].role ===
                  "assistant"
              ) {
                historyMessages.value[historyMessages.value.length - 1].usage =
                  usageInfo;
              }
            },
            // 处理思维链内容回调
            (thinkingContent: string) => {
              ensureAssistantMessage();
              thinking.value = true;
              historyMessages.value[historyMessages.value.length - 1].thinking =
                thinkingContent;
            }
          ).then(() => {
            historyMessages.value[historyMessages.value.length - 1].id =
              new Date().getTime().toString();
          });
        }
      }
    },
    { deep: true }
  );

  // 模型列表
  const modelList = ref<ModelListInfo[]>([]);

  // 获取模型列表
  const getModelList = async () => {
    try {
      const response = await ChatService.GetModelList();
      modelList.value = response.data.data;
    } catch (error) {
      console.error("获取模型列表失败:", error);
    }
  };

  return {
    token,
    completing,
    chatWithLLM,
    historyMessages,
    addMessageToHistory,
    clearHistoryMessages,
    getModelList,
    modelList,
    modelInfo,
    onlineCount,
    thinking
  };
});