package eta_llm

import (
	"bytes"
	"encoding/json"
	"errors"
	"eta/eta_api/services/llm/facade/bus_response"
	"eta/eta_api/utils"
	"eta/eta_api/utils/llm"
	"eta/eta_api/utils/llm/eta_llm/eta_llm_http"
	"fmt"
	"io"
	"net/http"
	"sync"
)

var (
	dsOnce sync.Once

	etaLlmClient *ETALLMClient
)

const (
	CONTENT_TYPE_JSON              = "application/json"
	KNOWLEDGE_BASE_CHAT_API        = "/chat/kb_chat"
	KNOWLEDGE_BASE_SEARCH_DOCS_API = "/knowledge_base/search_docs"
)

type ETALLMClient struct {
	*llm.LLMClient
	LlmModel string
}

func GetInstance() llm.LLMService {
	dsOnce.Do(func() {
		if etaLlmClient == nil {
			etaLlmClient = &ETALLMClient{
				LLMClient: llm.NewLLMClient(utils.LLM_SERVER, 10),
				LlmModel:  utils.LLM_MODEL,
			}
		}
	})
	return etaLlmClient
}

func (ds *ETALLMClient) KnowledgeBaseChat() string {
	ds.HttpClient.Post(ds.BaseURL+KNOWLEDGE_BASE_CHAT_API, CONTENT_TYPE_JSON, nil)
	return ""
}

func (ds *ETALLMClient) SearchKbDocs(query string, KnowledgeBaseName string) (content interface{}, err error) {
	// 类型断言

	kbReq := eta_llm_http.KbSearchDocsRequest{
		Query:             query,
		KnowledgeBaseName: KnowledgeBaseName,
		TopK:              10,
		ScoreThreshold:    0.5,
		Metadata:          struct{}{},
	}

	body, err := json.Marshal(kbReq)
	if err != nil {
		return
	}
	resp, err := ds.DoPost(KNOWLEDGE_BASE_SEARCH_DOCS_API, body)
	if !resp.Success {
		err = errors.New(resp.Msg)
		return
	}
	if resp.Data != nil {
		var kbSearchRes []bus_response.SearchDocsResponse
		err = json.Unmarshal(resp.Data, &kbSearchRes)
		if err != nil {
			err = errors.New("搜索知识库失败")
			return
		}
		content = kbSearchRes
		return
	}
	err = errors.New("搜索知识库失败")
	return
}
func init() {
	err := llm.Register(llm.ETA_LLM_CLIENT, GetInstance())
	if err != nil {
		utils.FileLog.Error("注册eta_llm_server服务失败:", err)
	}
}

func (ds *ETALLMClient) DoPost(apiUrl string, body []byte) (baseResp eta_llm_http.BaseResponse, err error) {
	requestReader := bytes.NewReader(body)
	response, err := ds.HttpClient.Post(ds.BaseURL+apiUrl, CONTENT_TYPE_JSON, requestReader)
	if err != nil {
		return
	}
	return parseResponse(response)
}

func parseResponse(response *http.Response) (baseResp eta_llm_http.BaseResponse, err error) {
	defer func() {
		_ = response.Body.Close()
	}()
	baseResp.Ret = response.StatusCode
	if response.StatusCode != http.StatusOK {
		baseResp.Msg = fmt.Sprintf("请求失败，状态码：%d, 状态信息：%s", response.StatusCode, http.StatusText(response.StatusCode))
		return
	}
	bodyBytes, err := io.ReadAll(response.Body)
	if err != nil {
		err = fmt.Errorf("读取响应体失败: %w", err)
		return
	}
	baseResp.Success = true
	baseResp.Data = bodyBytes
	return
}