package label

import (
	"context"
	"encoding/json"
	"entgo.io/ent/dialect/sql"
	"strings"
	"time"
	"wechat-api/ent"
	"wechat-api/ent/label"
	"wechat-api/internal/svc"
	"wechat-api/internal/types"

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

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

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

func (l *LabelImportLogic) LabelImport(req *types.LabelImportReq) (resp *types.LabelImportResp, err error) {
	// todo: add your logic here and delete this line
	organizationId := l.ctx.Value("organizationId").(uint64)
	contentString := req.Content
	contentList := splitContent(contentString)
	existingLabels, err := l.svcCtx.DB.Label.Query().
		Where(
			label.NameIn(contentList...),
			label.OrganizationID(organizationId),
		).
		Select(label.FieldName).
		All(l.ctx)
	if err != nil {
		return nil, err
	}
	//var toInsert []string
	existMap := make(map[string]bool, len(existingLabels))
	for _, tag := range existingLabels {
		existMap[tag.Name] = true
	}
	labelCreates := make([]*ent.LabelCreate, 0)
	inserted := make([]string, 0)
	existed := make([]string, 0)
	failed := make([]string, 0)
	insertNames := make([]string, 0) // 新增：用于失败时记录哪些尝试插入的标签
	for _, tag := range contentList {
		if existMap[tag] {
			existed = append(existed, tag)
			continue
		}
		if !existMap[tag] {
			labelCreates = append(labelCreates, l.svcCtx.DB.Label.Create().
				SetName(tag).
				SetType(*req.Type).
				SetStatus(1).
				SetOrganizationID(organizationId).
				SetFrom(1).
				SetMode(1).
				SetConditions(`{}`).
				SetCreatedAt(time.Now()).
				SetUpdatedAt(time.Now()),
			)
		}
		inserted = append(inserted, tag)
		insertNames = append(insertNames, tag) // 新增：记录本次尝试插入的标签
	}
	if len(labelCreates) > 0 {
		err := l.svcCtx.DB.Label.CreateBulk(labelCreates...).
			OnConflict(sql.ConflictColumns(label.FieldName, label.FieldOrganizationID)).
			DoNothing().
			Exec(l.ctx)
		if err != nil {
			failed = insertNames
			jsonBad, _ := json.Marshal(insertNames)
			logx.Errorf("标签批量插入失败：%v，失败数据：%s", err, string(jsonBad))
			//return nil, err
		}
	}
	return &types.LabelImportResp{
		BaseDataInfo: types.BaseDataInfo{Code: 0, Msg: "success"},
		Data: types.LabelImportInfo{
			Inserted: nonEmptySlice(inserted),
			Existed:  nonEmptySlice(existed),
			Failed:   nonEmptySlice(failed),
		},
	}, nil
}

// 去重 & 切分内容：
func splitContent(content string) []string {
	// 先统一换行符为 \n
	content = strings.ReplaceAll(content, "\r\n", "\n")
	content = strings.ReplaceAll(content, "\r", "\n")

	// 再按 \n 分割
	lines := strings.Split(content, "\n")

	// 去除每行空格，并过滤空行
	unique := make(map[string]struct{})
	for _, line := range lines {
		tag := strings.TrimSpace(line)
		if tag != "" {
			unique[tag] = struct{}{}
		}
	}
	result := make([]string, 0, len(unique))
	for tag := range unique {
		result = append(result, tag)
	}
	return result
}

func nonEmptySlice(s []string) []string {
	if len(s) == 0 {
		return []string{}
	}
	return s
}