package lib

import (
	"SciencesServer/utils"
	"errors"
	"fmt"
	"github.com/tealeg/xlsx"
	"reflect"
	"strings"
)

type Excel struct {
	File *xlsx.File

	name    string
	sheet   string
	header  string
	title   []string
	content *ExcelContent

	body map[string][]map[string]string
}

type ExcelContent struct {
	Kind    ExcelContentKind
	Content []interface{}
}

type ExcelContentKind int

const (
	ExcelContentKindForStruct ExcelContentKind = iota + 1
	ExcelContentKindForSlice
	ExcelContentKindForText
)

type OptionExcel func(excel *Excel)

func WithExcelName(name string) OptionExcel {
	return func(excel *Excel) {
		excel.name = name
	}
}

func WithExcelSheet(sheet string) OptionExcel {
	return func(excel *Excel) {
		excel.sheet = sheet
	}
}

func WithExcelHeader(header string) OptionExcel {
	return func(excel *Excel) {
		excel.header = header
	}
}

func WithExcelTitle(title []string) OptionExcel {
	return func(excel *Excel) {
		excel.title = title
	}
}

func WithExcelContent(content *ExcelContent) OptionExcel {
	return func(excel *Excel) {
		excel.content = content
	}
}

// Export 导出
func (this *Excel) Export() error {
	this.File = xlsx.NewFile()
	sheet, _ := this.File.AddSheet(this.sheet)
	row := new(xlsx.Row)
	cell := new(xlsx.Cell)

	style := xlsx.NewStyle()

	style.Alignment = xlsx.Alignment{
		Horizontal: "center",
		Vertical:   "center",
	}
	if this.header != "" {
		row = sheet.AddRow()
		row.SetHeight(28.0)
		cell = row.AddCell()
		cell.HMerge = 1 // 横向合并
		//cell.VMerge = 1 // 纵向合并
		cell.Value = this.header
		cell.SetStyle(style)

		if this.title != nil && len(this.title) > 0 {
			cell.HMerge = len(this.title) - 1
		}
	}
	if this.title != nil && len(this.title) > 0 {
		row = sheet.AddRow()

		for _, v := range this.title {
			cell = row.AddCell()
			cell.Value = v
		}
	}
	if this.content != nil {
		for _, v := range this.content.Content {
			row = sheet.AddRow()

			if this.content.Kind == ExcelContentKindForStruct {
				row.WriteStruct(v, -1)
				continue
			}
			if this.content.Kind == ExcelContentKindForSlice {
				row.WriteSlice(v, -1)
				continue
			}
			for i := 0; i < len(this.title); i++ {
				cell = row.AddCell()
				// TODO：存在不同类型，请自行加判断
				switch v.(type) {
				case []string:
					cell.Value = v.([]string)[i]
					break
				case []int:
					cell.Value = fmt.Sprintf("%v", v.([]int)[i])
					break
				case []interface{}:
					cell.Value = fmt.Sprintf("%v", v.([]interface{})[i])
					break
				default:
					return errors.New("未知数据类型")
				}
			}
		}
	}
	return nil
}

// Import 导入
// @file：文件信息
// @headers：标题数量
func (this *Excel) Import(file string, headers int) error {
	_file, err := xlsx.OpenFile(file)

	if err != nil {
		return err
	}
	out := make(map[string][]map[string]string, 0)
	// 循环Sheet
	for _, sheet := range _file.Sheets {
		data := make([]map[string]string, 0)

		local := 0

		if headers > 0 {
			local += headers
		}
		for i := local + 1; i < len(sheet.Rows); i++ {
			body := sheet.Rows[i].Cells
			_data := make(map[string]string, 0)

			for key, cell := range sheet.Rows[local].Cells {
				_data[cell.String()] = body[key].String()
			}
			data = append(data, _data)
		}
		out[sheet.Name] = data
	}
	this.body = out

	return nil
}

// Save 保存
func (this *Excel) Save(path string) error {
	return this.File.Save(this.name + ".xlsx")
	isExist, err := utils.PathExists(path)

	if err != nil {
		return err
	}
	if !isExist {
		if err = utils.MkdirAll(path); err != nil {
			return err
		}
	}
	fmt.Printf("%s/%s.xlsx", path, this.name)
	return nil
	//return this.Save(fmt.Sprintf("%s\%s.xlsx", path, this.name))
}

// Analysis 解析
func (this *Excel) Analysis(sheet string, src interface{}) error {
	for k, v := range this.body["专家信息"][0] {

		tRef := reflect.TypeOf(src).Elem()

		fieldNum := tRef.NumField()

		for i := 0; i < fieldNum; i++ {
			// 匹配结构字段名称
			if k != strings.ToLower(tRef.Field(i).Tag.Get("xlsx")) {
				continue
			}
			vRef := reflect.ValueOf(src).Elem().FieldByName(tRef.Field(i).Name)

			if !vRef.CanSet() {
				continue
			}
			switch vRef.Type().String() {
			case "string":
				vRef.SetString(v)
				break
			case "int", "int64":
				vRef.SetInt(utils.StringToInt64(v))
				break
			case "uint", "uint64":
				vRef.SetUint(utils.StringToUnit64(v))
				break
			}
		}
	}
	return nil
}

func NewExcel(options ...OptionExcel) *Excel {
	out := new(Excel)

	for _, opt := range options {
		opt(out)
	}
	return out
}