package excel

import (
	"fmt"
	"net/url"
	"reflect"
	"strconv"

	"github.com/gin-gonic/gin"
	"github.com/xuri/excelize/v2"
)

type ExcelServer struct {
	File      *excelize.File
	SheetName string  // 可定义默认sheet名称
	Height    float64 // 默认行高度
}

// ExportToPath 导出基本的表格
func (l *ExcelServer) ExportToPath(params []map[string]string, data []map[string]interface{}, path string) (string, error) {
	l.Export(params, data)
	name := createFileName()
	filePath := path + "/" + name
	err := l.File.SaveAs(filePath)
	return filePath, err
}

// ExportToWeb 导出到浏览器。此处使用的gin框架 其他框架可自行修改ctx
func (l *ExcelServer) ExportToWeb(params []map[string]string, data []map[string]interface{}, c *gin.Context) {
	l.Export(params, data)
	buffer, _ := l.File.WriteToBuffer()
	//设置文件类型
	c.Header("Content-Type", "application/vnd.ms-excel;charset=utf8")
	//设置文件名称
	c.Header("Content-Disposition", "attachment; filename="+url.QueryEscape(createFileName()))
	_, _ = c.Writer.Write(buffer.Bytes())
}

//设置首行
func (l *ExcelServer) writeTop(params []map[string]string) {
	topStyle, _ := l.File.NewStyle(&excelize.Style{
		Font: &excelize.Font{Bold: true},
		Alignment: &excelize.Alignment{
			Horizontal: "center",
			Vertical:   "center",
		},
		Protection:    nil,
		NumFmt:        0,
		DecimalPlaces: 0,
		CustomNumFmt:  nil,
		Lang:          "",
		NegRed:        false,
	})
	var word = 'A'
	//首行写入
	for _, conf := range params {
		title := conf["title"]
		width, _ := strconv.ParseFloat(conf["width"], 64)
		line := fmt.Sprintf("%c1", word)
		//设置标题
		_ = l.File.SetCellValue(l.SheetName, line, title)
		//列宽
		_ = l.File.SetColWidth(l.SheetName, fmt.Sprintf("%c", word), fmt.Sprintf("%c", word), width)
		//设置样式
		_ = l.File.SetCellStyle(l.SheetName, line, line, topStyle)
		word++
	}
}

//写入数据
func (l *ExcelServer) writeData(params []map[string]string, data []map[string]interface{}) {
	lineStyle, _ := l.File.NewStyle(&excelize.Style{Alignment: &excelize.Alignment{
		Horizontal: "center",
		Vertical:   "center",
	}})
	//数据写入
	var j = 2 //数据开始行数
	for i, val := range data {
		//设置行高
		_ = l.File.SetRowHeight(l.SheetName, i+1, l.Height)
		//逐列写入
		var word = 'A'
		for _, conf := range params {
			valKey := conf["key"]
			line := fmt.Sprintf("%c%v", word, j)
			isNum := conf["is_num"]

			//设置值
			if isNum != "0" {
				valNum := fmt.Sprintf("'%v", val[valKey])
				_ = l.File.SetCellValue(l.SheetName, line, valNum)
			} else {
				_ = l.File.SetCellValue(l.SheetName, line, val[valKey])
			}

			//设置样式
			_ = l.File.SetCellStyle(l.SheetName, line, line, lineStyle)
			word++
		}
		j++
	}
	//设置行高 尾行
	_ = l.File.SetRowHeight(l.SheetName, len(data)+1, l.Height)
}

func (l *ExcelServer) Export(params []map[string]string, data []map[string]interface{}) {
	l.writeTop(params)
	l.writeData(params, data)
}

// ExportExcelByStruct excel导出(数据源为Struct) []interface{}
func (l *ExcelServer) ExportExcelByStruct(titleList []string, data []interface{}, fileName string, sheetName string, c *gin.Context) error {
	l.File.SetSheetName("Sheet1", sheetName)
	header := make([]string, 0)
	for _, v := range titleList {
		header = append(header, v)
	}
	rowStyleID, _ := l.File.NewStyle(&excelize.Style{
		Font: &excelize.Font{
			Family: "arial",
			Size:   13,
			Color:  "#666666",
		},
		Alignment: &excelize.Alignment{
			Horizontal: "center",
			Vertical:   "center",
		},
	})
	_ = l.File.SetSheetRow(sheetName, "A1", &header)
	_ = l.File.SetRowHeight("Sheet1", 1, 30)
	length := len(titleList)
	headStyle := Letter(length)
	var lastRow string
	var widthRow string
	for k, v := range headStyle {
		if k == length-1 {
			lastRow = fmt.Sprintf("%s1", v)
			widthRow = v
		}
	}
	if err := l.File.SetColWidth(sheetName, "A", widthRow, 30); err != nil {
		fmt.Print("错误--", err.Error())
	}
	rowNum := 1
	for _, v := range data {
		t := reflect.TypeOf(v)
		fmt.Print("--ttt--", t.NumField())
		value := reflect.ValueOf(v)
		row := make([]interface {
		}, 0)
		for l := 0; l < t.NumField(); l++ {
			val := value.Field(l).Interface()
			row = append(row, val)
		}
		rowNum++
		err := l.File.SetSheetRow(sheetName, "A"+strconv.Itoa(rowNum), &row)
		_ = l.File.SetCellStyle(sheetName, fmt.Sprintf("A%d", rowNum), fmt.Sprintf("%s", lastRow), rowStyleID)
		if err != nil {
			return err
		}
	}
	disposition := fmt.Sprintf("attachment; filename=%s.xlsx", url.QueryEscape(fileName))
	c.Writer.Header().Set("Content-Type", "application/octet-stream")
	c.Writer.Header().Set("Content-Disposition", disposition)
	c.Writer.Header().Set("Content-Transfer-Encoding", "binary")
	c.Writer.Header().Set("Access-Control-Expose-Headers", "Content-Disposition")
	return l.File.Write(c.Writer)
}

// Letter 遍历a-z
func Letter(length int) []string {
	var str []string
	for i := 0; i < length; i++ {
		str = append(str, string(rune('A'+i)))
	}
	return str
}