package main
 
import (
    "bufio"
    "encoding/json"
    "errors"
    "flag"
    "fmt"
    "io"
    "os"
    "strconv"
    "strings"
 
    "github.com/axgle/mahonia"
)
 
//給 fmt.Println 起一個(gè)短的別名。
var p = fmt.Println
 
//定義一個(gè)全局變量 一個(gè)月上班加休息總天數(shù)
var gAllDays float64 = 0
 
//定義一個(gè)全局變量 考勤異常的天數(shù)
var gAbnormalDays int = 0
 
//上班信息
type WorkInfo struct {
    WorkDate  string //上班日期
    StartTime string //上班打卡時(shí)間
    EndTime   string //下班打卡時(shí)間
    LaborHour string //當(dāng)天工時(shí)
}
 
//考勤異常信息
type WorkAbnormalInfo struct {
    WorkDate   string //上班日期
    NormalInfo string //異常信息
}
 
/**
 * @brief  把當(dāng)前字符串按照指定方式進(jìn)行編碼
 * @param[in]       src                   待進(jìn)行轉(zhuǎn)碼的字符串
 * @param[in]       srcCode               字符串當(dāng)前編碼
 * @param[in]       tagCode               要轉(zhuǎn)換的編碼
 * @return   進(jìn)行轉(zhuǎn)換后的字符串
 */
func ConvertToString(src string, srcCode string, tagCode string) (string, error) {
    if len(src) == 0 || len(srcCode) == 0 || len(tagCode) == 0 {
        return "", errors.New("input arguments error")
    }
    srcCoder := mahonia.NewDecoder(srcCode)
    srcResult := srcCoder.ConvertString(src)
    tagCoder := mahonia.NewDecoder(tagCode)
    _, cdata, _ := tagCoder.Translate([]byte(srcResult), true)
    result := string(cdata)
 
    return result, nil
}
 
/**
 * @brief            寫入數(shù)據(jù)到指定名字的文件中
 * @param[in]       buf                    待寫入的數(shù)據(jù)內(nèi)容
 * @param[in]       name                文件名字
 * @return   成功返回nil 失敗返回error    錯(cuò)誤信息
 */
func WriteFile(name string, buf string) error {
    if len(name) == 0 || len(buf) == 0 {
        return errors.New("input arguments error")
    }
 
    fout, err := os.OpenFile(name, os.O_CREATE|os.O_RDWR, 0666)
    defer fout.Close()
    if err != nil {
        return err
    }
 
    //寫入到本地文件中
    fout.WriteString(buf)
 
    return nil
}
 
/**
 * @brief  讀取文件
 * @param[in]       name            文件名（可以加路徑）
 * @return   成功返回 文件內(nèi)容，失敗返回error    錯(cuò)誤信息
 */
func ReadFile(name string) ([]byte, error) {
    if len(name) == 0 {
        return nil, errors.New("input arguments error")
    }
 
    //打開本地文件 讀取出全部數(shù)據(jù)
    fin, err := os.Open(name)
    defer fin.Close()
    if err != nil {
        return nil, errors.New("Close error")
    }
 
    buf_len, _ := fin.Seek(0, os.SEEK_END)
    fin.Seek(0, os.SEEK_SET)
 
    buf := make([]byte, buf_len)
    fin.Read(buf)
 
    return buf, nil
}
 
/**
 * @brief  讀取csv文件并打印指定員工信息
 * @param[in]       csvName            csv文件名（可以加路徑）
 * @param[in]       employeeName        員工名字
 * @return   成功返回 員工結(jié)構(gòu)體信息，失敗返回error    錯(cuò)誤信息
 */
func ReadCsvFile(csvName string, employeeName string) ([]WorkInfo, error) {
    if len(csvName) == 0 || len(employeeName) == 0 {
        return nil, errors.New("error: input arguments error")
    }
 
    var WorkInfoSet []WorkInfo
    var AbnormalSet []WorkAbnormalInfo
    var isExistName bool
    var dayCount float64 = 0
    var isNormal string
    var isNormalFlag bool
 
    var index int = 0
    var indexWorkDate int
    var indexStartTime int
    var indexEndTime int
    var indexLaborHour int
    var indexNormalInfo int
    var indexIsNormal int
 
    var i int = 0
 
    f, err := os.Open(csvName)
    if err != nil {
        return nil, err
    }
    defer f.Close()
 
    rd := bufio.NewReader(f)
    for {
        gbk_line, err := rd.ReadString('\n') //以'\n'為結(jié)束符讀入一行
        if err != nil || io.EOF == err {
            break
        }
        //p("gbk:", gbk_line)
 
        //把每一行g(shù)bk格式的字符串 轉(zhuǎn)換為 utf-8格式字符串
        utf8_line, _ := ConvertToString(gbk_line, "gbk", "utf-8")
 
        //對(duì)第一行進(jìn)行處理
        if i == 0 {
            i = 1 //保證 只有第一行被處理
            p("utf8:", utf8_line)
            first_line := strings.Split(utf8_line, ",")
 
            for _, val := range first_line {
 
                if val == "日期" {
                    indexWorkDate = index
                }
                if val == "上班" {
                    indexStartTime = index
                }
                if val == "下班" {
                    indexEndTime = index
                }
                if val == "工時(shí)" {
                    indexLaborHour = index
                }
                if val == "是否有考勤異常" {
                    indexIsNormal = index
                }
                if val == "工時(shí)異常" {
                    indexNormalInfo = index
                }
 
                index++
            }
        }
 
        if strings.Contains(utf8_line, employeeName) {
            //把存在員工標(biāo)記為true
            isExistName = true
 
            split_line := strings.Split(utf8_line, ",")
            person_temp := WorkInfo{split_line[indexWorkDate],
                split_line[indexStartTime],
                split_line[indexEndTime],
                split_line[indexLaborHour],
            }
 
            //考勤表天數(shù)加1
            dayCount++
            isNormal = split_line[indexIsNormal]
            //統(tǒng)計(jì)打卡異常的信息
            if isNormal == "是" {
                aInfo := WorkAbnormalInfo{split_line[indexWorkDate], split_line[indexNormalInfo]}
                AbnormalSet = append(AbnormalSet, aInfo)
 
                gAbnormalDays++
                isNormalFlag = true
            }
 
            WorkInfoSet = append(WorkInfoSet, person_temp)
        }
    }
 
    //統(tǒng)計(jì)考勤表里所有天數(shù)
    gAllDays = dayCount
    //對(duì)于不存在指定員工名字 的處理
    if !isExistName {
        p("\nRemind: There is no employee is csv file!\n")
        os.Exit(1)
    }
 
    //顯示員工所有考勤信息
    p("\n員工姓名：", employeeName)
    p("\n全部考勤信息：")
    for _, temp := range WorkInfoSet {
        fmt.Printf(
            "日期:%s ,上班:%s,下班:%s,工時(shí):%s\n",
            temp.WorkDate,
            temp.StartTime,
            temp.EndTime,
            temp.LaborHour,
        )
    }
 
    //顯示員工打卡異常信息
    if isNormalFlag {
        p("\n異?？记谛畔ⅲ?)
        for _, val := range AbnormalSet {
            fmt.Printf("日期:%s , 異常信息:%s\n", val.WorkDate, val.NormalInfo)
        }
        p("溫馨提示：考勤出現(xiàn)異常信息，請(qǐng)及時(shí)給助理說明情況～_～\n")
    }
 
    return WorkInfoSet, nil
}
 
/**
* @brief  寫入json文件
* @param[in]       employeeName        員工名字
* @param[in]       workInfoSet            員工結(jié)構(gòu)體信息
* @return   成功返回 nil，失敗返回error    錯(cuò)誤信息
 */
func WriteJsonFile(employeeName string, workInfoSet []WorkInfo) error {
    if len(employeeName) == 0 || workInfoSet == nil {
        return errors.New("error: input arguments error")
    }
 
    //把輸出內(nèi)容寫入name.json文件中
    filename := fmt.Sprintf("%s%s", employeeName, ".json")
    str, _ := json.Marshal(workInfoSet)
    err := WriteFile(string(str), filename)
    if err != nil {
        return err
    }
    return nil
}
 
/**
* @brief  讀取json文件
* @param[in]       employeeName        員工名字
* @return   成功返回 nil，失敗返回error    錯(cuò)誤信息
 */
func ReadJsonFile(employeeName string) error {
    if len(employeeName) == 0 {
        return errors.New("error: input arguments error")
    }
 
    var WorkInfoSet []WorkInfo
    filename := fmt.Sprintf("%s%s", employeeName, ".json")
 
    ReadJsonBuf, err := ReadFile(filename)
    if err != nil {
        p(err.Error())
        return err
    }
    var sumHour float64 = 0.0
    var dayCount float64 = 0
    var weekCounts float64 = 0.0
    var averageWeekHour float64 = 0.0
 
    json.Unmarshal(ReadJsonBuf, &WorkInfoSet)
 
    for _, one_work := range WorkInfoSet {
 
        //去掉打卡異常情況和周六末情況 (如果周六末加班 數(shù)據(jù)依然計(jì)算進(jìn)入總工時(shí))
        if one_work.StartTime == "" || one_work.EndTime == "" {
            continue
        }
 
        one_day_hour, _ := strconv.ParseFloat(one_work.LaborHour, 64)
        sumHour += one_day_hour
        dayCount++
    }
 
    fmt.Printf("根據(jù)json文件計(jì)算工時(shí)，考勤正常天數(shù)：%2.0f, 異常天數(shù)：%d\n", dayCount, gAbnormalDays)
    weekCounts = gAllDays / 7
    averageWeekHour = sumHour / weekCounts
    //p("考勤表總天數(shù)：", gAllDays, ",共多少周：", week_counts)
 
    fmt.Printf("月總工時(shí)：%.4f 每周的平均工時(shí):%.4f\n\n", sumHour, averageWeekHour)
 
    return nil
}
 
func main() {
    args := os.Args
 
    input := flag.String("i", "查無此人", "input employee name")
    path := flag.String("p", "./data.csv", "input csv file path")
 
    flag.Parse()
 
    if len(args) == 1 {
        fmt.Println("./main: missing operand")
        fmt.Println("Try `./main -h' or './main --help' for more information.")
        return
    }
 
    var csvName string = *path
    var employeeName string = *input
 
    //讀取csv文件并打印指定員工信息
    WorkInfoSet, err := ReadCsvFile(csvName, employeeName)
    if err != nil {
        p(err.Error())
        return
    }
 
    //把指定員工信息寫入json文件
    err = WriteJsonFile(employeeName, WorkInfoSet)
    if err != nil {
        p(err.Error())
        return
    }
 
    //讀取json文件并計(jì)算指定員工總工時(shí)和平均工時(shí)
    err = ReadJsonFile(employeeName)
    if err != nil {
        p(err.Error())
        return
    }
}

func main() {
	f, err := os.Create("data.csv")
	if err != nil {
		panic(err)
	}
	defer f.Close()

	f.WriteString("\xEF\xBB\xBF") // 寫入U(xiǎn)TF-8 BOM，避免使用Microsoft Excel打開亂碼

	writer := csv.NewWriter(f)
	writer.Write([]string{"編號(hào)", "姓名", "年齡"})
	writer.Write([]string{"1", "張三", "23"})
	writer.Write([]string{"2", "李四", "24"})
	writer.Write([]string{"3", "王五", "25"})
	writer.Write([]string{"4", "趙六", "26"})
	writer.Flush() // 此時(shí)才會(huì)將緩沖區(qū)數(shù)據(jù)寫入
}

func ExportCsv(c *gin.Context) {
	bytesBuffer := &bytes.Buffer{}
	bytesBuffer.WriteString("\xEF\xBB\xBF") // 寫入U(xiǎn)TF-8 BOM，避免使用Microsoft Excel打開亂碼

	writer := csv.NewWriter(bytesBuffer)
	writer.Write([]string{"編號(hào)", "姓名", "年齡"})
	writer.Write([]string{"1", "張三", "23"})
	writer.Write([]string{"2", "李四", "24"})
	writer.Write([]string{"3", "王五", "25"})
	writer.Write([]string{"4", "趙六", "26"})

	writer.Flush() // 此時(shí)才會(huì)將緩沖區(qū)數(shù)據(jù)寫入

	// 設(shè)置下載的文件名
	c.Writer.Header().Set("Content-Disposition", "attachment;filename=data.csv")
	// 設(shè)置文件類型以及輸出數(shù)據(jù)
	c.Data(http.StatusOK, "text/csv", bytesBuffer.Bytes())
	return
}