package excel_import

import (
	"context"
	"fmt"
	"github.com/bytedance/sonic"
	"github.com/go-kratos/kratos/v2/log"
	"github.com/go-kratos/kratos/v2/transport/http"
	"github.com/xuri/excelize/v2"
	"io"
	"math"
	urlnet "net/url"
	"os"
	"strconv"
	"strings"
	"sync"
	"sync/atomic"
	"time"
)

type ImportExcel struct {
	Ctx             context.Context
	basePath        string
	task            *Task
	errRowsExporter *CreateExcel
	rowCount        int
	importRowsCount int32
	RowPicCells     []string                               //图片所在单元格
	PicSaveHandle   func(pic *Pic) (url string, err error) //存储图片文件
	DeleteOssHandle func(ObjectName []string) (err error)  //删除OSS图片
	GetFileObject   func(fileObjectUrl string) (body io.ReadCloser, err error)
	Rows            []map[string]string
	TrimFiled       []string //需要进行去掉空格操作的字段
	RegexFiledMap   map[string]*Regex
	JobName         string   //任务类型，区分不同业务
	TaskId          string   //自动生成
	SpeedMod        bool     //是否开启加速
	SliceLen        uint     //加速模式下，并行切片长度,默认为100
	Header          []string //头部标题对标
	HandleFunc      func(excel *ImportExcel, rows []map[string]string)
	FileObjectUrl   string
	DownloadUrl     string
}

type checkOption struct {
	TrimCheck  bool
	RegexCheck bool
}

func NewImportExcel(jobName string, opts ...Option) *ImportExcel {
	Import := &ImportExcel{

		JobName:         jobName,
		errRowsExporter: &CreateExcel{}, //错误行导出
		task:            &Task{},        //任务
	}
	for _, opt := range opts {
		opt(Import) // 应用选项
	}
	return Import
}

func (i *ImportExcel) Init(ctx http.Context, handleFunc func(excel *ImportExcel, row []map[string]string)) (*ImportExcel, error) {
	i.Ctx = ctx
	basePath, err := importLogPath(i.JobName)
	i.basePath = basePath
	if err != nil {
		return nil, err
	}
	err = CheckDir(i.taskFile())
	if err != nil {
		return nil, err
	}
	err = CheckDir(i.importLogFile())
	if err != nil {
		return nil, err
	}
	err = CheckDir(i.errExcelPath())
	if err != nil {
		return nil, err
	}
	i.HandleFunc = handleFunc
	i.TaskId = i.createTaskId()
	err = i.GetRows(ctx.Request())
	if err != nil {
		return nil, err
	}
	i.errRowsExporter.FileName = fmt.Sprintf("%s.xlsx", i.TaskId)
	i.errRowsExporter.Path = i.errExcelPath()

	return i, nil
}

func (i *ImportExcel) Run() (err error) {
	//创建任务
	i.task = &Task{
		TaskId: i.TaskId,
		Ctime:  time.Now().Format(time.DateTime),
		Status: TaskStatusInit,
	}
	err = i.updateTask()
	if err != nil {
		return err
	}
	i.rowCount = len(i.Rows) - 1
	err = i.filedCheck()
	if err != nil {
		return err
	}
	if i.SpeedMod {
		if i.SliceLen == 0 {
			i.SliceLen = 100
		}
		//从第二行开始读取
		for j := 1; j <= len(i.Rows[1:]); j += int(i.SliceLen) {
			if j+int(i.SliceLen) > len(i.Rows) {
				i.SliceLen = uint(len(i.Rows) - j)
			}
			//****HandleFunc需要创建子上下文来防止ctx被取消导致上下文丢失**** ChildCtx,cancel:=context.WithCancel(context.BackGround()) defer cancel()
			go i.HandleFunc(i, i.Rows[j:j+int(i.SliceLen)])
		}
	} else {
		i.HandleFunc(i, i.Rows[1:])
	}
	i.task.Status = TaskStatusFinish
	i.updateTask()
	return nil
}

func (i *ImportExcel) filedCheck() (err error) {
	var (
		checkOptions checkOption
		errMsg       []string
	)
	if len(i.TrimFiled) >= 0 {
		checkOptions.TrimCheck = true
	}
	if len(i.RegexFiledMap) >= 0 {
		checkOptions.RegexCheck = true
	}

	//去掉空格
	trimKeysMap := make(map[string]struct{})
	for _, key := range i.TrimFiled {
		trimKeysMap[key] = struct{}{}
	}
	trimValue := func(value string) string {
		return strings.TrimSpace(value)
	}

	for line, dataMap := range i.Rows[1:] {
		for key, value := range dataMap {
			//去掉空格
			if checkOptions.TrimCheck {
				if _, exists := trimKeysMap[key]; exists {
					value = trimValue(value)
				}
			}
			//正则匹配
			if checkOptions.RegexCheck {
				if _, exists := i.RegexFiledMap[key]; exists {
					match := RegexMatch(i.RegexFiledMap[key].Rule, value)
					if match == i.RegexFiledMap[key].MatchBool {
						errMsg = append(errMsg, fmt.Sprintf("第%d行,字段:%s,值:%s,格式错误:%s", line+2, key, value, i.RegexFiledMap[key].Desc))
					}
				}
			}
			dataMap[key] = value
		}
	}
	if len(errMsg) > 0 {
		return fmt.Errorf(strings.Join(errMsg, "\n"))
	}
	return
}

func (i *ImportExcel) GetRows(request *http.Request) (err error) {
	err = i.getRowsFromHttp(request)
	if err != nil {
		return err
	}
	if i.Rows == nil || len(i.Rows) == 0 {
		return fmt.Errorf("未获取到导入数据或导入数据为空")
	}

	return nil
}

func (i *ImportExcel) GetTaskInfo(taskId string) (*TaskResp, error) {
	var (
		info *Task
	)
	i.TaskId = taskId
	basePath, err := importLogPath(i.JobName)
	i.basePath = basePath
	if err != nil {
		return nil, err
	}
	taskInfo, _ := os.ReadFile(i.taskFile())
	_ = sonic.Unmarshal(taskInfo, &info)
	if info == nil {
		//	兼容，提供默认值，类似：{"task_id":"1734576235708222000","process":100,"ctime":"2024-12-19 10:44:03","ftime":"2024-12-19 10:44:03","status":2}
		info = &Task{
			TaskId:  taskId,
			Process: 0,
			Status:  TaskStatusInit,
			Ctime:   time.Now().Format(time.DateTime),
			Ftime:   time.Now().Format(time.DateTime),
		}
	}
	if info.Process >= 95 {
		info.Process = 100
	}

	return &TaskResp{
		Task:         info,
		ImportErrLog: i.importLog(),
	}, nil
}

func (i *ImportExcel) importLog() []*ImportLog {
	var logs = []*ImportLog{}
	_, err := os.Stat(i.importLogFile())
	if err != nil {
		return logs
	}
	taskLog, err := os.ReadFile(i.importLogFile())
	if err != nil {
		return logs
	}
	logList := strings.Split(string(taskLog), "\n")
	for _, v := range logList {
		if v == "" {
			continue
		}
		var log *ImportLog
		err = sonic.Unmarshal([]byte(v), &log)
		if err != nil {
			return logs
		}
		logs = append(logs, log)
	}
	return logs
}

func (i *ImportExcel) GetExcel(taskId string) string {
	i.TaskId = taskId
	basePath, _ := importLogPath(i.JobName)
	i.basePath = basePath
	return i.errExcelFile()
}

func (i *ImportExcel) DownloadExcel(ctx http.Context) (err error) {
	taskId := ctx.Query().Get("task_id")
	addr := i.GetExcel(taskId)
	_, exist := os.Stat(addr)
	if exist != nil {
		return fmt.Errorf("文件不存在")
	}

	file, err := os.Open(addr)
	if err != nil {
		return err
	}
	defer file.Close()
	payload, err := io.ReadAll(file)
	if err != nil {
		return err
	}
	// 设置HTTP响应头
	// 打开为预览
	//ctx.Response().Header().Set("Content-Type", "image/png")
	// 打开为下载
	ctx.Response().Header().Set("Content-Type", "application/octet-stream")
	ctx.Response().Header().Set("Content-Disposition", "attachment; filename="+taskId+".xlsx")
	// 将结果写入
	_, err = ctx.Response().Write(payload)
	return
}

func (i *ImportExcel) DownloadExcelTemp(ctx http.Context) (err error) {

	file, err := os.Open(i.DownloadUrl)
	if err != nil {
		return err
	}
	defer file.Close()
	payload, err := io.ReadAll(file)
	if err != nil {
		return err
	}
	// 设置HTTP响应头
	// 打开为预览
	//ctx.Response().Header().Set("Content-Type", "image/png")
	// 打开为下载
	ctx.Response().Header().Set("Content-Type", "application/octet-stream")
	ctx.Response().Header().Set("Content-Disposition", "attachment; filename="+i.JobName+".xlsx")
	// 将结果写入
	_, err = ctx.Response().Write(payload)
	return
}

func (i *ImportExcel) TaskInfo(ctx http.Context) (err error) {
	taskId := ctx.Query().Get("task_id")
	importExcelInfo, err := i.GetTaskInfo(taskId)
	if err != nil {
		return err
	}
	response := make(map[string]interface{}, 1)

	response["data"] = importExcelInfo
	return ctx.Result(200, response)
}

func (i *ImportExcel) TaskHis(ctx http.Context) (err error) {
	var (
		data []map[string]interface{}
		res  ResPage
	)

	page := ctx.Query().Get("page")
	num := ctx.Query().Get("limit")

	path := i.taskPath()

	entries := SortFileWithStatus(path)
	count := len(entries)
	pageInt, _ := strconv.ParseInt(page, 10, 64)
	numInt, _ := strconv.ParseInt(num, 10, 64)
	begin := (pageInt - 1) * numInt
	entEnd := begin + numInt
	if count < int(entEnd) {
		entEnd = int64(count)
	}
	entries = entries[begin:entEnd]
	for _, entry := range entries {
		if entry.FileInfo == nil {
			break
		}
		info := make(map[string]interface{})
		if entry.IsDir() {
			continue
		}
		info["task_id"] = entry.Name()
		file := fmt.Sprintf("%s/%s", path, entry.Name())
		bytes, _ := os.ReadFile(file)
		_ = sonic.Unmarshal(bytes, &info)
		fileOs, _ := os.Stat(file)
		info["update_time"] = fileOs.ModTime().Format(time.DateTime)
		data = append(data, info)
	}
	res = ResPage{
		Page:     int(pageInt),
		Limit:    int(numInt),
		Total:    count,
		Data:     data,
		LastPage: int(math.Ceil(float64(count) / float64(numInt))),
	}
	response := make(map[string]interface{}, 1)

	response["data"] = res
	return ctx.Result(200, response)
}

func (i *ImportExcel) getRowsFromHttp(r *http.Request) (err error) {
	//	定义一个file文件
	var file io.ReadCloser
	// 获取上传的文件
	//	获取post请求的参数
	fileObjectUrl := r.FormValue("fileObjectUrl")
	if i.GetFileObject != nil && fileObjectUrl != "" {
		//	判断fileObjectUrl 是否为excel相关得格式
		if !IsExcelFormat(fileObjectUrl) {
			return fmt.Errorf("文件格式错误, 不是excel")
		}
		file, err = i.GetFileObject(fileObjectUrl)
		if err != nil {
			return err
		}
		//	记录excel地址，用于删除文件
		i.FileObjectUrl = fileObjectUrl
	} else {
		file, _, err = r.FormFile("file")
		speed_mode := r.PostForm.Get("speed_mode")
		if strings.EqualFold(speed_mode, "true") {
			i.SpeedMod = true
		}
		if err != nil {
			return fmt.Errorf("未找到导入文件: %w", err)
		}
	}
	defer file.Close()

	// 解析Excel文件
	f, err := excelize.OpenReader(file)
	if err != nil {
		return fmt.Errorf("解析excel文件失败: %w", err)
	}
	defer f.Close()
	// 获取第一个工作表的名称
	sheetNames := f.GetSheetList()
	if len(sheetNames) == 0 {
		return fmt.Errorf("无效的excel，未获取到对应的sheet")
	}
	rows, err := f.GetRows(sheetNames[0])
	if err != nil {
		return fmt.Errorf("excel内未找到数据: %w", err)
	}

	if i.PicSaveHandle != nil {
		i.RowPicCells, err = f.GetPictureCells(sheetNames[0])
		if err != nil {
			return fmt.Errorf("excel内图片获取失败: %w", err)
		}
		// 遍历所有的图片
		var picList []*Pic
		for _, cell := range i.RowPicCells {
			if cell == "N1" {
				continue
			}
			pics, _err := f.GetPictures(sheetNames[0], cell)
			if _err != nil {
				return fmt.Errorf("excel内未找到图片: %w", _err)
			}
			if len(pics) > 0 {
				for _, v := range pics {
					if v.File != nil {
						picList = append(picList, &Pic{
							PicInfos: v,
							Cell:     cell,
						})
					}
				}
			}
		}
		fmt.Printf("开始上传OSS，时间：%s \n", time.Now().Format(time.DateTime))
		if len(picList) > 0 {
			var (
				cellUrlMap = make(map[string][]string)
				wg         = sync.WaitGroup{}
				mu         sync.Mutex
			)
			wg.Add(len(picList))
			for _, pic := range picList {
				go func() {
					defer wg.Done()
					defer func() {
						if r := recover(); r != nil {
							fmt.Printf("图片上传失败，cell:%s,url:%s,err:%s", pic.Cell, pic.Url, r)
						}
					}()
					url, _err := i.PicSaveHandle(pic)
					mu.Lock()
					if _err != nil {
						log.Error(fmt.Sprintf("图片上传失败，cell:%s,url:%s,err:%s", pic.Cell, pic.Url, _err.Error()))
					}
					cellUrlMap[pic.Cell] = append(cellUrlMap[pic.Cell], url)
					mu.Unlock()
				}()
			}
			wg.Wait()
			fmt.Printf("结束上传OSS，时间：%s \n", time.Now().Format(time.DateTime))
			if len(cellUrlMap) > 0 {
				for cell, cellPic := range cellUrlMap {
					err = f.SetCellValue(sheetNames[0], cell, strings.Join(cellPic, ","))
					if err != nil {
						continue
					}
				}
			}
		}
		fmt.Printf("os--暂无图片，时间：%s \n", time.Now().Format(time.DateTime))
		//从新获取一次
		rows, err = f.GetRows(sheetNames[0])
		if err != nil {
			return fmt.Errorf("excel内未找到数据: %w", err)
		}
	}
	// 获取所有行

	if len(rows) == 0 {
		return fmt.Errorf("无效的excel，未获取到对应的记录数据")
	}

	if len(i.Header) > 0 || i.Header != nil {

		i.Rows = ExchangeRows(rows, i.Header)
	}

	return err
}

func (i *ImportExcel) getRowsFromFile(filePath string) (err error) {

	return err
}

func (i *ImportExcel) updateTask() error {

	file, err := os.OpenFile(i.taskFile(), os.O_RDWR|os.O_TRUNC|os.O_CREATE, 0766)
	if err != nil {
		return err
	}
	defer file.Close()

	taskInfo, err := sonic.Marshal(i.task)
	if err != nil {
		return err
	}
	jsonInfo := string(taskInfo)
	_, err = file.WriteString(jsonInfo)
	if err != nil {
		return err
	}
	return nil
}
func (i *ImportExcel) AddErr(failReason string, key int, row map[string]string) {

	_ = i.updateImportLog(&ImportLog{
		FailReason: failReason,
		Line:       key,
	})

	var interfaces []interface{}
	rowSort := ExchangeRowWithMap(row, i.Header)
	for _, v := range rowSort {
		interfaces = append(interfaces, v)
	}
	interfaces = append(interfaces, failReason)
	i.errRowsExporter.Rows = append(i.errRowsExporter.Rows, interfaces)
	i.errRowsExporter.ErrFileUrls = append(i.errRowsExporter.ErrFileUrls, row["货品图片"])
	i.Next()

	return
}

func (i *ImportExcel) Next() (err error) {
	atomic.AddInt32(&i.importRowsCount, 1)
	i.task.Process = int(i.importRowsCount * 100 / int32(i.rowCount))
	i.updateTask()
	if int(i.importRowsCount) == i.rowCount {
		i.task.Process = 100
		i.task.Status = TaskStatusCreateFailExcel
		err = i.updateTask()
		if err != nil {
			return
		}
		if len(i.errRowsExporter.Rows) > 0 {
			headerInterfaces := make([]interface{}, len(i.Header)+1)
			for index, header := range i.Header {
				headerInterfaces[index] = header
			}
			headerInterfaces[len(headerInterfaces)-1] = "失败原因"
			i.errRowsExporter.Header = headerInterfaces
			err = i.errRowsExporter.Init()
			if err != nil {
				return
			}
			for _, v := range i.errRowsExporter.Rows {
				_ = i.errRowsExporter.Write(v)
			}
			i.errRowsExporter.Save()
		}
		//	删除已经上传到OSS的图片
		if len(i.errRowsExporter.ErrFileUrls) > 0 {
			var errFileObjectName []string
			for _, url := range i.errRowsExporter.ErrFileUrls {
				if url == "" {
					continue
				}
				ossUrl := strings.Split(url, ",")
				for _, v := range ossUrl {
					parsedURL, err := urlnet.Parse(v)
					if err != nil {
						fmt.Printf("解析URL失败: %v\n", err)
						continue
					}
					//	去掉path前面得/
					parsedURL.Path = strings.TrimPrefix(parsedURL.Path, "/")
					errFileObjectName = append(errFileObjectName, parsedURL.Path)
				}
			}
			// 批量删除OSS文件
			if len(errFileObjectName) > 0 {
				if i.DeleteOssHandle != nil {
					err = i.DeleteOssHandle(errFileObjectName)
					if err != nil {
						return
					}
				}
			}
		}

		if i.FileObjectUrl != "" {
			// 批量删除OSS文件
			if i.DeleteOssHandle != nil {
				err = i.DeleteOssHandle([]string{i.FileObjectUrl})
				if err != nil {
					return
				}
			}
		}
	}
	i.task.Status = TaskStatusRunning
	i.task.Ftime = time.Now().Format(time.DateTime)
	i.updateTask()
	return nil
}

func (i *ImportExcel) CreateFailExcel() {
	i.importRowsCount++
}

func (i *ImportExcel) updateImportLog(importLog *ImportLog) error {
	file, err := os.OpenFile(i.importLogFile(), os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0766)
	if err != nil {
		return err
	}
	defer file.Close()
	logInfo, err := sonic.Marshal(importLog)
	if err != nil {
		return err
	}
	jsonInfo := string(logInfo)
	_, err = file.WriteString(jsonInfo + "\n")
	if err != nil {
		return err
	}
	return nil
}

func (i *ImportExcel) taskFile() string {
	return i.basePath + "/task/" + i.TaskId
}

func (i *ImportExcel) taskPath() string {
	if i.basePath == "" {
		basePath, _ := importLogPath(i.JobName)
		i.basePath = basePath
	}
	return i.basePath + "/task/"
}

func (i *ImportExcel) importLogFile() string {
	return i.basePath + "/import/" + i.TaskId
}

func (i *ImportExcel) errExcelPath() string {
	return i.basePath + "/excel/"
}

func (i *ImportExcel) errExcelFile() string {
	return i.errExcelPath() + i.TaskId + ".xlsx"
}

func (i *ImportExcel) createTaskId() string {
	return fmt.Sprintf("%d", time.Now().UnixNano())
}