package models

import (
	"bytes"
	"encoding/json"
	"errors"
	"fmt"
	"github.com/codinl/go-logger"
	"github.com/xuri/excelize/v2"
	"go-admin/app/admin/models/tools"
	orm "go-admin/common/global"
	"gorm.io/gorm"
	"reflect"
	"strconv"
	"strings"
)

type CategoryExcel struct {
	FirstCategory  string `json:"first_category" binding:"required"` // 一级分类
	SecondCategory string `json:"second_category"`                   // 二级分类
	ThreeCategory  string `json:"three_category"`                    // 三级分类
}

type CommodityExcel struct {
	Category       string `json:"category" binding:"required"`         // 商品所属分类
	Name           string `json:"name"  binding:"required"`            // 商品名称
	IMEIType       string `json:"imei_type" binding:"required"`        // 是否串码 1-无串码 2-串码（系统生成） 3-串码（手动添加）
	SysGenerate    string `json:"sys_generate" binding:"required"`     // 系统生成串码
	SupplierName   string `json:"supplier_name" binding:"required"`    // 供应商名称
	SellBrokerage  string `json:"sell_brokerage" binding:"required"`   // 销售毛利提成
	StaffBrokerage string `json:"staff_brokerage" binding:"required"`  // 员工毛利提成
	MemberDiscount string `json:"member_discount" binding:"required"`  // 会员优惠
	RetailPrice    string `json:"retail_price" binding:"required"`     // 指导零售价
	MinRetailPrice string `json:"min_retail_price" binding:"required"` // 最低零售价
	WholesalePrice string `json:"wholesale_price" binding:"required"`  // 指导采购价
	StaffCostPrice string `json:"staff_cost_price" binding:"required"` // 员工成本价加价
	Origin         string `json:"origin"`                              // 产地
	Remark         string `json:"remark"`                              // 备注
}

// 获取struct的tag标签，匹配excel导入数据
func getJSONTagNames(s interface{}) []string {
	valueType := reflect.TypeOf(s)
	if valueType.Kind() != reflect.Struct {
		fmt.Println("传入的不是结构体")
		return nil
	}

	var tagNames []string
	for i := 0; i < valueType.NumField(); i++ {
		field := valueType.Field(i)
		tag := field.Tag.Get("json")
		if tag != "" {
			tagNames = append(tagNames, tag)
		}
	}

	return tagNames
}

// 预览excel数据（不做必填项校验）
func FileExcelReader(d []byte, cols []string) ([]byte, []map[string]interface{}, error) {
	reader, err := excelize.OpenReader(bytes.NewReader(d))
	if err != nil {
		return nil, nil, fmt.Errorf("open reader error: %v", err)
	}

	sheetList := reader.GetSheetList()
	if len(sheetList) == 0 {
		return nil, nil, errors.New("sheet list is empty")
	}

	rows, err := reader.Rows(sheetList[0])
	if err != nil {
		return nil, nil, fmt.Errorf("reader rows error: %v", err)
	}

	sheetCols, err := reader.GetCols(sheetList[0])
	if err != nil {
		return nil, nil, fmt.Errorf("reader get cols error: %v", err)
	}
	if len(sheetCols) == 0 {
		return nil, nil, errors.New("get cols is empty")
	}

	var colsMap []map[string]interface{}
	if len(cols) == 0 {
		switch sheetList[0] {
		case "导分类":
			cols = getJSONTagNames(CategoryExcel{})
		case "导商品":
			cols = getJSONTagNames(CommodityExcel{})
		default:
			cols = make([]string, len(sheetCols))
			for i := range sheetCols {
				cols[i] = fmt.Sprintf("c%02d", i)
			}
		}
	} else if len(cols) != len(sheetCols) {
		return nil, nil, errors.New("cols length does not match the number of columns")
	}

	for rows.Next() {
		columns, err := rows.Columns()
		if err != nil {
			return nil, nil, fmt.Errorf("rows columns error: %v", err)
		}

		columnMap := make(map[string]interface{}, len(cols))
		for i, col := range cols {
			if i < len(columns) {
				columnMap[col] = columns[i]
			} else {
				columnMap[col] = ""
			}
		}

		logger.Info("columnMap:", columnMap)
		colsMap = append(colsMap, columnMap)
	}

	logger.Info("colsMap:", colsMap)
	mCols, err := json.Marshal(colsMap)
	if err != nil {
		return mCols, nil, fmt.Errorf("marshal error: %v", err)
	}

	return mCols, colsMap, nil
}

// 导入excel数据（校验必填项）
func FileExcelImport(d []byte, cols []string, ntype int) ([]byte, []map[string]interface{}, error) {
	reader, err := excelize.OpenReader(bytes.NewReader(d))
	if err != nil {
		return nil, nil, fmt.Errorf("open reader error: %v", err)
	}

	sheetList := reader.GetSheetList()
	if len(sheetList) == 0 {
		return nil, nil, errors.New("sheet list is empty")
	}

	rows, err := reader.Rows(sheetList[0])
	if err != nil {
		return nil, nil, fmt.Errorf("reader rows err: %v", err)
	}

	sheetCols, err := reader.GetCols(sheetList[0])
	if err != nil {
		return nil, nil, fmt.Errorf("reader get cols err: %v", err)
	}

	if len(sheetCols) == 0 {
		return nil, nil, errors.New("get cols is empty")
	}

	var colsMap []map[string]interface{}
	if len(cols) == 0 {
		switch ntype { // 导入类型：1 商品分类  2 商品资料
		case 1:
			if sheetList[0] != "导分类" {
				return nil, nil, errors.New("格式错误，不是分类模版excel")
			}
			if err := checkCategoryExcel(sheetCols); err != nil {
				return nil, nil, err
			}
			cols = getJSONTagNames(CategoryExcel{})
		case 2:
			if sheetList[0] != "导商品" {
				return nil, nil, errors.New("格式错误，不是商品模版excel")
			}
			if err := checkCommodityExcel(sheetCols); err != nil {
				return nil, nil, err
			}
			cols = getJSONTagNames(CommodityExcel{})
		default:
			return nil, nil, errors.New("格式错误，不是商品分类或资料模版excel")
		}
	} else if len(cols) != len(sheetCols) {
		return nil, nil, errors.New("cols length does not match the number of columns")
	}

	for rows.Next() {
		columns, err := rows.Columns()
		if err != nil {
			return nil, nil, fmt.Errorf("rows columns err: %v", err)
		}

		columnMap := make(map[string]interface{}, len(cols))
		for i, col := range cols {
			if i < len(columns) {
				columnMap[col] = columns[i]
			} else {
				columnMap[col] = ""
			}
		}

		logger.Info("columnMap:", columnMap)
		colsMap = append(colsMap, columnMap)
	}

	logger.Info("colsMap:", colsMap)
	mCols, err := json.Marshal(colsMap)
	if err != nil {
		return mCols, nil, fmt.Errorf("marshal err: %v", err)
	}

	return mCols, colsMap, nil
}

// 校验商品分类导入规则
// 导入商品分类校验报错： （1）只有3级，没有2级或1级 （2）有2，3级，但没有1级
func checkCategoryExcel(sheetCols [][]string) error {
	if len(sheetCols) != 3 {
		return errors.New("模版错误，请检查文件")
	}

	if len(sheetCols[0]) < len(sheetCols[1]) || len(sheetCols[0]) < len(sheetCols[2]) {
		return errors.New("格式错误，缺少一级分类")
	} else if len(sheetCols[1]) < len(sheetCols[2]) {
		return errors.New("格式错误，缺少二级分类")
	}

	for i := 1; i < len(sheetCols[2]); i++ {
		if sheetCols[0][i] == "" && (sheetCols[1][i] != "" || sheetCols[2][i] != "") {
			return errors.New("格式错误，缺少一级分类")
		} else if sheetCols[2][i] != "" && sheetCols[1][i] == "" {
			return errors.New("格式错误，缺少二级分类")
		}
	}

	if duplicateName, nFlag := hasDuplicateNames(sheetCols); nFlag {
		return fmt.Errorf("分类名称不允许重复，请检查:[%v]", duplicateName)
	}

	return nil
}

// 校验名称是否相同，有则false
func hasDuplicateNames(sheetCols [][]string) (string, bool) {
	nameMap := make(map[string]struct{})

	for _, col := range sheetCols {
		for _, name := range col {
			if _, exists := nameMap[name]; exists && name != "" {
				// 有重复的名称
				return name, true
			}
			nameMap[name] = struct{}{}
		}
	}
	// 没有重复的名称
	return "", false
}

// 校验商品资料导入规则
// 导入商品资料校验报错：必填项缺少数据（除了产地、备注，其他都是必填项）
func checkCommodityExcel(sheetCols [][]string) error {
	if len(sheetCols) != 14 {
		return errors.New("模版错误，请检查文件")
	}

	for i := 0; i < len(sheetCols)-2; i++ {
		if len(sheetCols[i]) < len(sheetCols[i+1]) {
			return errors.New("格式错误，有必填项未录入")
		}
		for _, v := range sheetCols[i] {
			if v == "" {
				return errors.New("格式错误，有必填项未录入")
			}
		}
	}
	return nil
}

// 将读取的excel数据转换成CategoryExcel struct
func transCategoryData(colsMap []map[string]interface{}) []CategoryExcel {
	var categories []CategoryExcel

	// 遍历 colsMap 进行类型断言和转换
	for _, col := range colsMap {
		var category CategoryExcel

		for key, value := range col {
			switch key {
			case "first_category":
				if name, ok := value.(string); ok {
					category.FirstCategory = name
				}
			case "second_category":
				if name, ok := value.(string); ok {
					category.SecondCategory = name
				}
			case "three_category":
				if name, ok := value.(string); ok {
					category.ThreeCategory = name
				}
			}
		}

		// 将处理后的数据追加到 categories 中
		categories = append(categories, category)
	}

	return categories
}

// 导入商品分类到数据库
// 规则：分类只有3级，所有分类不允许名称完全相同
func ImportCategoryData(colsMap []map[string]interface{}, businessId uint32) error {
	data := transCategoryData(colsMap)

	if duplicateName, nFlag := hasDuplicateInDb(data); nFlag {
		return fmt.Errorf("数据库已有此分类名称，不允许重复，请检查:[%v]", duplicateName)
	}

	for _, item := range data {
		var firstCategory, secondCategory, threeCategory Category
		if item.FirstCategory == "" { // 一级分类名称为空则跳过，继续遍历
			continue
		}

		// 插入或获取一级分类
		err := orm.Eloquent.Debug().FirstOrCreate(&firstCategory,
			Category{
				Name:                  item.FirstCategory,
				Pid:                   0,
				Display:               1,
				CooperativeBusinessId: businessId,
			}).Error
		if err != nil {
			return err
		}

		// 插入或获取二级分类
		if item.SecondCategory != "" {
			err = orm.Eloquent.Debug().FirstOrCreate(&secondCategory,
				Category{
					Name:                  item.SecondCategory,
					Pid:                   firstCategory.ID,
					Display:               1,
					CooperativeBusinessId: businessId,
				}).Error
			if err != nil {
				return err
			}

		}

		// 插入三级分类
		if item.ThreeCategory != "" {
			err = orm.Eloquent.Debug().FirstOrCreate(&threeCategory,
				Category{
					Name:                  item.ThreeCategory,
					Pid:                   secondCategory.ID,
					Display:               1,
					CooperativeBusinessId: businessId,
				}).Error
			if err != nil {
				return err
			}
		}
	}

	return nil
}

// 判断是否存在重复数据
func hasDuplicateInDb(data []CategoryExcel) (string, bool) {
	for _, item := range data {
		if exists := isCategoryExists(item.FirstCategory); exists {
			return item.FirstCategory, true
		}

		if exists := isCategoryExists(item.SecondCategory); exists {
			return item.SecondCategory, true
		}

		if exists := isCategoryExists(item.ThreeCategory); exists {
			return item.ThreeCategory, true
		}
	}

	return "", false
}

// 判断分类是否存在
func isCategoryExists(categoryName string) bool {
	var count int64
	orm.Eloquent.Debug().Model(&Category{}).
		Where("name = ?", categoryName).
		Count(&count)

	return count > 0
}

// 导入商品资料
func ImportCommodityData(colsMap []map[string]interface{}, businessId uint32) error {
	data, err := transCommodityData(colsMap)
	if err != nil {
		return err
	}

	var erpCommodities []ErpCommodity
	erpCommodities, err = convertToErpCommodities(data)
	if err != nil {
		return err
	}

	err = updateOrInsertCommodities(erpCommodities)
	if err != nil {
		return err
	}

	return nil
}

// 将读取的excel数据转换成CommodityExcel struct
func transCommodityData(colsMap []map[string]interface{}) ([]CommodityExcel, error) {
	var commodities []CommodityExcel

	// 遍历 colsMap 进行类型断言和转换
	for _, col := range colsMap {
		var commodity CommodityExcel

		// 将 col 转换为 JSON 字符串
		jsonData, err := json.Marshal(col)
		if err != nil {
			return nil, fmt.Errorf("failed to marshal data to JSON: %v", err)
		}

		// 将 JSON 字符串反序列化为 CommodityExcel
		if err := json.Unmarshal(jsonData, &commodity); err != nil {
			return nil, fmt.Errorf("failed to unmarshal JSON to CommodityExcel: %v", err)
		}

		// 将处理后的数据追加到 commodities 中
		commodities = append(commodities, commodity)
	}

	return commodities, nil
}

func convertToErpCommodities(data []CommodityExcel) ([]ErpCommodity, error) {
	var erpCommodities []ErpCommodity

	productCounter := tools.NewProductCounter()
	for _, item := range data {
		category, err := getCategoryByName(item.Category)
		if err != nil {
			return nil, err
		}

		list, err := GetSupplier(GetSupplierRequest{Name: item.SupplierName})
		if len(list) == 0 || errors.Is(err, gorm.ErrRecordNotFound) {
			return nil, fmt.Errorf("有供应商未导入，请检查:[%v]", item.SupplierName)
		}

		serialNumber := fmt.Sprintf("%s%04d", category.Number,
			getNumberOnCategory(category.ID)+int64(productCounter.GetNextProductNumber(category.Number)))
		fmt.Println("商品编号:", serialNumber)

		erpCommodity, err := convertToErpCommodity(item, category, list[0], serialNumber)
		if err != nil {
			return nil, err
		}

		erpCommodities = append(erpCommodities, erpCommodity)
	}

	return erpCommodities, nil
}

// 查询商品分类
func getCategoryByName(name string) (*Category, error) {
	var category Category
	err := orm.Eloquent.Debug().Model(&Category{}).
		Where("name = ?", name).First(&category).Error
	if errors.Is(err, gorm.ErrRecordNotFound) {
		return nil, fmt.Errorf("有商品分类未导入，请检查:[%v]", name)
	}
	return &category, err
}

// 转换格式，匹配Commodity的model
func convertToErpCommodity(item CommodityExcel, category *Category, supplier *Supplier, serialNumber string) (ErpCommodity, error) {
	brokerage1Float, err := strconv.ParseFloat(strings.TrimRight(item.SellBrokerage, "%"), 64) // 销售毛利
	if err != nil {
		return ErpCommodity{}, fmt.Errorf("销售毛利转换有误:[%v]", err)
	}
	brokerage2Float, err := strconv.ParseFloat(strings.TrimRight(item.StaffBrokerage, "%"), 64) // 员工毛利提成
	if err != nil {
		return ErpCommodity{}, fmt.Errorf("员工毛利提成转换有误:[%v]", err)
	}
	memberDiscountFloat, err := strconv.ParseFloat(item.MemberDiscount, 64) // 会员优惠
	if err != nil {
		return ErpCommodity{}, fmt.Errorf("会员优惠转换有误:[%v]", err)
	}
	nRetailPrice, err := strconv.ParseUint(item.RetailPrice, 10, 32) // 指导零售价
	if err != nil {
		return ErpCommodity{}, fmt.Errorf("指导零售价转换有误:[%v]", err)
	}
	nMinRetailPrice, err := strconv.ParseUint(item.MinRetailPrice, 10, 32) // 最低零售价
	if err != nil {
		return ErpCommodity{}, fmt.Errorf("最低零售价转换有误:[%v]", err)
	}
	nStaffCostPrice, err := strconv.ParseUint(item.StaffCostPrice, 10, 32) // 员工成本价加价
	if err != nil {
		return ErpCommodity{}, fmt.Errorf("员工成本价加价转换有误:[%v]", err)
	}
	nWholesalePrice, err := strconv.ParseUint(item.WholesalePrice, 10, 32) // 指导采购价
	if err != nil {
		return ErpCommodity{}, fmt.Errorf("指导采购价转换有误:[%v]", err)
	}

	//将是否串码转换为数字 1-无串码 2-串码（系统生成） 3-串码（手动添加）
	var nIMEIType uint32
	switch item.IMEIType {
	case "串码类":
		if item.SysGenerate == "是" {
			nIMEIType = 2
		} else if item.SysGenerate == "否" {
			nIMEIType = 3
		} else {
			return ErpCommodity{}, errors.New("[系统生成串码]列有非法字段")
		}
	case "非串码":
		nIMEIType = 1
	default:
		return ErpCommodity{}, errors.New("[是否串码]列有非法字段")
	}

	//serialNumber := fmt.Sprintf("%s%04d", category.Number, getNumberOnCategory(category.ID)+1)
	//fmt.Println("商品编号:", serialNumber)

	return ErpCommodity{
		SerialNumber:    serialNumber,
		Name:            item.Name,
		ErpCategoryId:   category.ID,
		ErpCategoryName: item.Category,
		IMEIType:        nIMEIType,
		ErpSupplierId:   supplier.ID,
		ErpSupplierName: item.SupplierName,
		RetailPrice:     uint32(nRetailPrice),
		MinRetailPrice:  uint32(nMinRetailPrice),
		StaffCostPrice:  uint32(nStaffCostPrice),
		WholesalePrice:  uint32(nWholesalePrice),
		Brokerage1:      brokerage1Float,
		Brokerage2:      brokerage2Float,
		MemberDiscount:  memberDiscountFloat,
		Origin:          item.Origin,
		Remark:          item.Remark,
	}, nil
}

// 操作数据库，通过商品名称查找，没有则插入，有则更新
func updateOrInsertCommodities(erpCommodities []ErpCommodity) error {
	for _, erpCommodity := range erpCommodities {
		var existingCommodity ErpCommodity
		result := orm.Eloquent.Where("name = ?", erpCommodity.Name).First(&existingCommodity)

		if result.Error != nil {
			if errors.Is(result.Error, gorm.ErrRecordNotFound) {
				orm.Eloquent.Create(&erpCommodity)
				fmt.Println("Inserted:", erpCommodity.Name)
			} else {
				fmt.Println("Error:", result.Error)
				return result.Error
			}
		} else {
			orm.Eloquent.Model(&existingCommodity).Updates(&erpCommodity)
			fmt.Println("Updated:", erpCommodity.Name)
		}
	}

	return nil
}

// 查询商品列表中同一类商品分类下商品的个数
func getNumberOnCategory(categoryId uint32) int64 {
	var count int64
	orm.Eloquent.Debug().Model(&ErpCommodity{}).
		Where("erp_category_id = ?", categoryId).
		Count(&count)

	return count
}

// 生成商品编号
func GenerateSerialNumber(categoryId uint32) (string, error) {
	var category Category
	err := orm.Eloquent.Debug().Model(&Category{}).
		Where("id = ?", categoryId).First(&category).Error
	if errors.Is(err, gorm.ErrRecordNotFound) {
		return "", errors.New("未查到商品分类")
	}

	var count int64
	orm.Eloquent.Debug().Model(&ErpCommodity{}).
		Where("erp_category_id = ?", category.ID).
		Count(&count)

	serialNumber := fmt.Sprintf("%s%04d", category.Number, count+1)
	fmt.Println("商品编号:", serialNumber)
	return serialNumber, nil
}