package excelparse

import "strings"

// NativeProductParser handles the MuYu product import template and product exports.
type NativeProductParser struct{}

func (p *NativeProductParser) Name() string { return "木语产品模板" }

func (p *NativeProductParser) Match(headers []string) bool {
	idx := buildIndex(headers)
	if !hasAny(idx, "产品名称", "名称") {
		return false
	}
	return hasAny(idx, "产品码", "色号", "批次号", "纱线配比", "生产工艺")
}

func (p *NativeProductParser) ParseRows(headers []string, rows [][]string) (*ParseResult, error) {
	idx := buildIndex(headers)
	seen := make(map[string]struct{}, len(rows))
	products := make([]ParsedProduct, 0, len(rows))
	skipped := 0

	for _, row := range rows {
		name := firstCol(row, idx, "产品名称", "名称")
		if name == "" {
			skipped++
			continue
		}

		productCode := firstCol(row, idx, "产品码", "Product Code", "product_code")
		key := productCode
		if key == "" {
			key = strings.Join([]string{
				name,
				firstCol(row, idx, "规格型号", "规格"),
				firstCol(row, idx, "颜色"),
				firstCol(row, idx, "色号"),
			}, "\x00")
		}
		if _, ok := seen[key]; ok {
			skipped++
			continue
		}
		seen[key] = struct{}{}

		products = append(products, ParsedProduct{
			ProductName:       name,
			Spec:              firstCol(row, idx, "规格型号", "规格"),
			Color:             firstCol(row, idx, "颜色"),
			ColorNo:           firstCol(row, idx, "色号"),
			ProductCode:       productCode,
			SalesPrice:        stripCurrency(firstCol(row, idx, "销售价", "参考售价")),
			BatchNo:           firstCol(row, idx, "批次号"),
			YarnRatio:         firstCol(row, idx, "纱线配比"),
			WarpWeightGM:      stripUnit(firstCol(row, idx, "经线克重(g/m)", "经线克重", "经纱克重")),
			WeftWeightGM:      stripUnit(firstCol(row, idx, "纬线克重(g/m)", "纬线克重", "纬纱克重")),
			ProductionProcess: firstCol(row, idx, "生产工艺"),
			Remark:            firstCol(row, idx, "备注"),
		})
	}

	return &ParseResult{Products: products, SkippedRows: skipped}, nil
}

func hasAny(idx map[string]int, names ...string) bool {
	for _, name := range names {
		if _, ok := idx[name]; ok {
			return true
		}
	}
	return false
}

func firstCol(row []string, idx map[string]int, names ...string) string {
	for _, name := range names {
		col, ok := idx[name]
		if !ok {
			continue
		}
		if val := colVal(row, col); val != "" {
			return val
		}
	}
	return ""
}