package chat

import (
	"context"
	"errors"
	"strconv"

	"wechat-api/ent"
	"wechat-api/internal/svc"
	"wechat-api/internal/types"
	"wechat-api/internal/utils/compapi"
	"wechat-api/internal/utils/contextkey"

	"wechat-api/ent/custom_types"
	"wechat-api/ent/predicate"
	"wechat-api/ent/usagedetail"
	"wechat-api/ent/usagetotal"

	"github.com/zeromicro/go-zero/core/logx"
)

type ChatCompletionsLogic struct {
	logx.Logger
	ctx    context.Context
	svcCtx *svc.ServiceContext
}

func NewChatCompletionsLogic(ctx context.Context, svcCtx *svc.ServiceContext) *ChatCompletionsLogic {
	return &ChatCompletionsLogic{
		Logger: logx.WithContext(ctx),
		ctx:    ctx,
		svcCtx: svcCtx}
}

func (l *ChatCompletionsLogic) ChatCompletions(req *types.CompApiReq) (resp *types.CompOpenApiResp, err error) {
	// todo: add your logic here and delete this line

	/*
	   1.鉴权获得token
	   2.必要参数检测及转换
	   3. 根据event_type选择不同处理路由
	*/
	var (
		apiKeyObj *ent.ApiKey
		ok        bool
	)
	workToken := compapi.GetWorkTokenByID(req.EventType, req.WorkId)
	apiKeyObj, ok = contextkey.AuthTokenInfoKey.GetValue(l.ctx)
	if !ok {
		return nil, errors.New("content get token err")
	}
	/*
		fmt.Println("=========================================")
		fmt.Printf("In ChatCompletion Get Token Info:\nKey:'%s'\n", apiKeyObj.Key)
		fmt.Printf("Title:'%s'\n", apiKeyObj.Title)
		fmt.Printf("OpenaiBase:'%s'\n", apiKeyObj.OpenaiBase)
		fmt.Printf("OpenaiKey:'%s'\n", apiKeyObj.OpenaiKey)
		fmt.Printf("workToken:'%s' because %s/%s\n", workToken, req.EventType, req.WorkId)
		fmt.Println("=========================================")
	*/

	if len(apiKeyObj.OpenaiBase) == 0 || len(workToken) == 0 {
		return nil, errors.New("not auth info")
	}

	apiResp, err := l.workForFastgpt(req, workToken, apiKeyObj.OpenaiBase)
	if err == nil && apiResp != nil {
		l.doRequestLog(req, apiResp) //请求记录
	}

	return apiResp, err
}

func (l *ChatCompletionsLogic) doRequestLog(req *types.CompApiReq, resp *types.CompOpenApiResp) error {
	authToken, ok := contextkey.OpenapiTokenKey.GetValue(l.ctx)
	if !ok {
		return errors.New("content get auth token err")
	}

	return l.appendUsageDetailLog(authToken, req, resp)
}

func (l *ChatCompletionsLogic) getUsagetotalIdByToken(authToken string) (uint64, error) {

	var predicates []predicate.UsageTotal
	predicates = append(predicates, usagetotal.BotIDEQ(authToken))
	return l.svcCtx.DB.UsageTotal.Query().Where(predicates...).FirstID(l.ctx)

}

func (l *ChatCompletionsLogic) replaceUsagetotalTokens(authToken string, sumTotalTokens uint64, newUsageDetailId uint64, orgId uint64) error {

	Id, err := l.getUsagetotalIdByToken(authToken)
	if err != nil && !ent.IsNotFound(err) {
		return err
	}
	if Id > 0 { //UsageTotal have record by  newUsageDetailId
		_, err = l.svcCtx.DB.UsageTotal.UpdateOneID(Id).
			SetTotalTokens(sumTotalTokens).
			SetEndIndex(newUsageDetailId).
			Save(l.ctx)
	} else { //create new record by  newUsageDetailId
		logType := 5
		_, err = l.svcCtx.DB.UsageTotal.Create().
			SetNotNilBotID(&authToken).
			SetNotNilEndIndex(&newUsageDetailId).
			SetNotNilTotalTokens(&sumTotalTokens).
			SetNillableType(&logType).
			SetNotNilOrganizationID(&orgId).
			Save(l.ctx)
	}

	return err
}

func (l *ChatCompletionsLogic) updateUsageTotal(authToken string, newUsageDetailId uint64, orgId uint64) error {

	sumTotalTokens, err := l.sumTotalTokensByAuthToken(authToken) //首先sum UsageDetail的TotalTokens
	if err == nil {
		err = l.replaceUsagetotalTokens(authToken, sumTotalTokens, newUsageDetailId, orgId) //再更新(包含新建)Usagetotal的otalTokens
	}
	return err
}

// sum total_tokens from usagedetail by AuthToken
func (l *ChatCompletionsLogic) sumTotalTokensByAuthToken(authToken string) (uint64, error) {

	var predicates []predicate.UsageDetail
	predicates = append(predicates, usagedetail.BotIDEQ(authToken))

	var res []struct {
		Sum, Min, Max, Count uint64
	}
	totalTokens := uint64(0)
	var err error = nil
	err = l.svcCtx.DB.UsageDetail.Query().Where(predicates...).Aggregate(ent.Sum("total_tokens"),
		ent.Min("total_tokens"), ent.Max("total_tokens"), ent.Count()).Scan(l.ctx, &res)
	if err == nil {
		if len(res) > 0 {
			totalTokens = res[0].Sum
		} else {
			totalTokens = 0
		}
	}
	return totalTokens, err
}

func (l *ChatCompletionsLogic) appendUsageDetailLog(authToken string, req *types.CompApiReq, resp *types.CompOpenApiResp) error {

	logType := 5
	workIdx := compapi.GetWorkIdxByID(req.EventType, req.WorkId)
	rawReqResp := custom_types.OriginalData{Request: req, Response: resp}

	tmpId := 0
	tmpId, _ = strconv.Atoi(resp.ID)
	sessionId := uint64(tmpId)
	orgId := uint64(0)
	apiKeyObj, ok := contextkey.AuthTokenInfoKey.GetValue(l.ctx)
	if ok {
		orgId = apiKeyObj.OrganizationID
	}
	promptTokens := uint64(resp.Usage.PromptTokens)
	completionToken := uint64(resp.Usage.CompletionTokens)
	totalTokens := promptTokens + completionToken

	res, err := l.svcCtx.DB.UsageDetail.Create().
		SetNotNilType(&logType).
		SetNotNilBotID(&authToken).
		SetNotNilReceiverID(&req.EventType).
		SetNotNilSessionID(&sessionId).
		SetNillableApp(&workIdx).
		SetNillableRequest(&req.Messages[0].Content).
		SetNillableResponse(&resp.Choices[0].Message.Content).
		SetNillableOrganizationID(&orgId).
		SetOriginalData(rawReqResp).
		SetNillablePromptTokens(&promptTokens).
		SetNillableCompletionTokens(&completionToken).
		SetNillableTotalTokens(&totalTokens).
		Save(l.ctx)

	if err == nil { //插入UsageDetai之后再统计UsageTotal
		l.updateUsageTotal(authToken, res.ID, orgId)
	}
	return err
}

func (l *ChatCompletionsLogic) workForFastgpt(req *types.CompApiReq, apiKey string, apiBase string) (resp *types.CompOpenApiResp, err error) {

	//apiKey := "fastgpt-d2uehCb2T40h9chNGjf4bpFrVKmMkCFPbrjfVLZ6DAL2zzqzOFJWP"
	if len(req.ChatId) > 0 && len(req.FastgptChatId) == 0 {
		req.FastgptChatId = req.ChatId
	}
	if len(req.Model) > 0 {
		if req.Variables == nil {
			req.Variables = make(map[string]string)
		}
		req.Variables["model"] = req.Model
	}
	return compapi.NewFastgptChatCompletions(l.ctx, apiKey, apiBase, req)

}