package eta_llm

import (
	"bufio"
	"bytes"
	"encoding/json"
	"errors"
	"eta/eta_api/models"
	"eta/eta_api/utils"
	"eta/eta_api/utils/llm"
	"eta/eta_api/utils/llm/eta_llm/eta_llm_http"
	"fmt"
	"io"
	"mime/multipart"
	"net/http"
	"os"
	"strings"
	"sync"
)

var (
	dsOnce sync.Once

	etaLlmClient *ETALLMClient
)

const (
	KNOWLEDEG_CHAT_MODE            = "local_kb"
	DEFALUT_PROMPT_NAME            = "default"
	CONTENT_TYPE_JSON              = "application/json"
	KNOWLEDGE_BASE_CHAT_API        = "/chat/kb_chat"
	DOCUMENT_CHAT_API              = "/chat/file_chat"
	KNOWLEDGE_BASE_SEARCH_DOCS_API = "/knowledge_base/search_docs"
	UPLOAD_TEMP_DOCS_API           = "/knowledge_base/upload_temp_docs"
)

type ETALLMClient struct {
	*llm.LLMClient
	LlmModel string
}

type LLMConfig struct {
	LlmAddress string `json:"llm_server"`
	LlmModel   string `json:"llm_model"`
}

func GetInstance() llm.LLMService {
	dsOnce.Do(func() {
		confStr := models.BusinessConfMap[models.LLMInitConfig]
		if confStr == "" {
			utils.FileLog.Error("LLM配置为空")
			return
		}

		var config LLMConfig
		err := json.Unmarshal([]byte(confStr), &config)
		if err != nil {
			utils.FileLog.Error("LLM配置错误")
		}
		if etaLlmClient == nil {
			etaLlmClient = &ETALLMClient{
				LLMClient: llm.NewLLMClient(config.LlmAddress, 120),
				LlmModel:  config.LlmModel,
			}
		}
	})
	return etaLlmClient
}

func (ds *ETALLMClient) DocumentChat(query string, KnowledgeId string, history []json.RawMessage, stream bool) (llmRes *http.Response, err error) {
	ChatHistory := make([]eta_llm_http.HistoryContent, 0)
	for _, historyItemStr := range history {
		var historyItem eta_llm_http.HistoryContent
		parseErr := json.Unmarshal(historyItemStr, &historyItem)
		if parseErr != nil {
			continue
		}
		//str := strings.Split(historyItemStr, "-")
		//historyItem := eta_llm_http.HistoryContent{
		//	Role:    str[0],
		//	Content: str[1],
		//}
		ChatHistory = append(ChatHistory, historyItem)
	}
	kbReq := eta_llm_http.DocumentChatRequest{
		Query:       query,
		KnowledgeId: KnowledgeId,
		History:     ChatHistory,
		TopK:        3,
		//ScoreThreshold: 0.5,
		ScoreThreshold: 2,
		Stream:         stream,
		ModelName:      ds.LlmModel,
		//Temperature:    0.7,
		Temperature: 0.01,
		MaxTokens:   0,
		//PromptName:  DEFALUT_PROMPT_NAME,
	}
	//fmt.Printf("%v", kbReq.History)
	body, err := json.Marshal(kbReq)
	fmt.Println(string(body))
	if err != nil {
		return
	}
	return ds.DoStreamPost(DOCUMENT_CHAT_API, body)
}

func (ds *ETALLMClient) KnowledgeBaseChat(query string, KnowledgeBaseName string, history []json.RawMessage) (llmRes *http.Response, err error) {
	ChatHistory := make([]eta_llm_http.HistoryContent, 0)
	for _, historyItemStr := range history {
		var historyItem eta_llm_http.HistoryContentWeb
		parseErr := json.Unmarshal(historyItemStr, &historyItem)
		if parseErr != nil {
			continue
		}
		ChatHistory = append(ChatHistory, eta_llm_http.HistoryContent{
			Content: historyItem.Content,
			Role:    historyItem.Role,
		})
	}
	kbReq := eta_llm_http.KbChatRequest{
		Query:          query,
		Mode:           KNOWLEDEG_CHAT_MODE,
		KbName:         KnowledgeBaseName,
		History:        ChatHistory,
		TopK:           3,
		ScoreThreshold: 0.5,
		Stream:         true,
		Model:          ds.LlmModel,
		Temperature:    0.7,
		MaxTokens:      0,
		PromptName:     DEFALUT_PROMPT_NAME,
		ReturnDirect:   false,
	}
	fmt.Printf("%v", kbReq.History)
	body, err := json.Marshal(kbReq)
	if err != nil {
		return
	}
	return ds.DoStreamPost(KNOWLEDGE_BASE_CHAT_API, body)
}

func (ds *ETALLMClient) FileChat(query string, KnowledgeId string, history []json.RawMessage) (resp eta_llm_http.BaseResponse, err error) {
	ChatHistory := make([]eta_llm_http.HistoryContent, 0)
	for _, historyItemStr := range history {
		var historyItem eta_llm_http.HistoryContentWeb
		parseErr := json.Unmarshal(historyItemStr, &historyItem)
		if parseErr != nil {
			continue
		}
		ChatHistory = append(ChatHistory, eta_llm_http.HistoryContent{
			Content: historyItem.Content,
			Role:    historyItem.Role,
		})
	}
	kbReq := eta_llm_http.DocumentChatRequest{
		ModelName:      ds.LlmModel,
		Query:          query,
		KnowledgeId:    KnowledgeId,
		History:        ChatHistory,
		TopK:           20,
		ScoreThreshold: 2,
		Stream:         false,
		Temperature:    0.01,
		MaxTokens:      0,
		PromptName:     DEFALUT_PROMPT_NAME,
	}
	body, err := json.Marshal(kbReq)
	if err != nil {
		utils.FileLog.Error("内容生成失败,序列化请求参数失败,err", err.Error())
		err = fmt.Errorf("内容生成失败,序列化请求参数失败,err:%v", err)
		return
	}
	return ds.DoPost(DOCUMENT_CHAT_API, body)
}

func (ds *ETALLMClient) UploadFileToTemplate(files []*os.File, param map[string]interface{}) (data interface{}, err error) {
	var pervId string
	if value, ok := param["PrevId"]; ok {
		pervId = value.(string)
	}
	docReq := eta_llm_http.UploadTempDocsRequest{
		ChunkOverlap:   "150",
		ChunkSize:      "750",
		PrevId:         pervId,
		ZhTitleEnhance: "false",
	}
	body, err := json.Marshal(docReq)
	if err != nil {
		return
	}
	resp, err := ds.DoFile(UPLOAD_TEMP_DOCS_API, body, files)
	if !resp.Success {
		err = errors.New(resp.Msg)
		return
	}
	if resp.Data != nil {
		var uploadDocsRes eta_llm_http.RagBaseResponse
		err = json.Unmarshal(resp.Data, &uploadDocsRes)
		if err != nil {
			err = errors.New("上传临时文件失败,err:" + err.Error())
			return
		}
		if uploadDocsRes.Code != 200 {
			err = errors.New("上传临时文件失败,err:" + uploadDocsRes.Msg)
			return
		}
		var uploadResult eta_llm_http.UploadDocsResponse
		err = json.Unmarshal(uploadDocsRes.Data, &uploadResult)
		if len(uploadResult.FiledFiles) > 0 {
			utils.FileLog.Warn("上传临时文件失败:", uploadResult.FiledFiles)
		}
		data = uploadResult
		return
	}
	return
}

func (ds *ETALLMClient) SearchKbDocs(query string, KnowledgeBaseName string) (content interface{}, err error) {
	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 []eta_llm_http.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 (ds *ETALLMClient) DoFile(apiUrl string, body []byte, files []*os.File) (baseResp eta_llm_http.BaseResponse, err error) {
	var requestBody bytes.Buffer
	writer := multipart.NewWriter(&requestBody)
	// 添加文件到请求体
	for _, file := range files {
		filePath, err := writer.CreateFormFile("files", file.Name())
		if err != nil {
			return baseResp, fmt.Errorf("创建文件表单字段失败: %w", err)
		}
		_, err = io.Copy(filePath, file)
		if err != nil {
			return baseResp, fmt.Errorf("写入文件内容失败: %w", err)
		}
	}
	var params = make(map[string]string)
	err = json.Unmarshal(body, &params)
	if err != nil {
		return
	}
	// 添加其他参数到请求体
	for key, value := range params {
		err := writer.WriteField(key, value)
		if err != nil {
			return baseResp, fmt.Errorf("写入表单字段失败: %w", err)
		}
	}

	// 关闭 writer，完成请求体的构建
	err = writer.Close()
	if err != nil {
		return baseResp, fmt.Errorf("关闭 multipart writer 失败: %w", err)
	}
	request, err := http.NewRequest("POST", ds.BaseURL+apiUrl, &requestBody)
	request.Header.Set("Content-Type", writer.FormDataContentType())
	response, err := ds.HttpClient.Do(request)
	if err != nil {
		return
	}
	return parseResponse(response)
}
func (ds *ETALLMClient) DoStreamPost(apiUrl string, body []byte) (baseResp *http.Response, err error) {
	requestReader := bytes.NewReader(body)
	return ds.HttpClient.Post(ds.BaseURL+apiUrl, CONTENT_TYPE_JSON, requestReader)
}
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
}
func ParseStreamResponse(response *http.Response) (contentChan chan string, errChan chan error, closeChan chan struct{}) {
	contentChan = make(chan string, 10)
	errChan = make(chan error, 10)
	closeChan = make(chan struct{})
	go func() {
		defer close(contentChan)
		defer close(errChan)
		defer close(closeChan)
		scanner := bufio.NewScanner(response.Body)
		scanner.Split(bufio.ScanLines)
		for scanner.Scan() {
			line := scanner.Text()
			if line == "" {
				continue
			}
			// 忽略 "ping" 行
			if strings.HasPrefix(line, ": ping") {
				continue
			}
			// 去除 "data: " 前缀
			if strings.HasPrefix(line, "data: ") {
				line = strings.TrimPrefix(line, "data: ")
			}
			var chunk eta_llm_http.ChunkResponse
			if err := json.Unmarshal([]byte(line), &chunk); err != nil {
				fmt.Println("解析错误的line:" + line)
				errChan <- fmt.Errorf("解析 JSON 块失败: %w", err)
				return
			}
			// 处理每个 chunk
			if chunk.Choices != nil && len(chunk.Choices) > 0 {
				for _, choice := range chunk.Choices {
					if choice.Delta.Content != "" {
						contentChan <- choice.Delta.Content
					}
				}
			}
		}
		if err := scanner.Err(); err != nil {
			errChan <- fmt.Errorf("读取响应体失败: %w", err)
			return
		}
	}()
	return
}