package excelparse

import (
	"strconv"
	"strings"
)

// MiaozhangParser handles Excel exports from 秒账 (miaozhang.cn).
//
// Expected headers:
//   图片1 | 图片2 | 图片3 | 名称 | 规格型号 | 颜色 | 条形码 | 匹数 | 库存数量 | 成本均价 | 参考售价 | 备注 | 更新日期
type MiaozhangParser struct{}

func (p *MiaozhangParser) Name() string { return "秒账" }

func (p *MiaozhangParser) Match(headers []string) bool {
	required := map[string]bool{"名称": false, "规格型号": false, "颜色": false, "匹数": false, "库存数量": false}
	for _, h := range headers {
		h = strings.TrimSpace(h)
		if _, ok := required[h]; ok {
			required[h] = true
		}
	}
	for _, found := range required {
		if !found {
			return false
		}
	}
	return true
}

func (p *MiaozhangParser) ParseRows(headers []string, rows [][]string) (*ParseResult, error) {
	idx := buildIndex(headers)

	var products []ParsedProduct
	skipped := 0

	for _, row := range rows {
		name := colVal(row, idx["名称"])

		if name == "" || strings.HasPrefix(name, "总") {
			skipped++
			continue
		}

		rolls, _ := strconv.ParseInt(colVal(row, idx["匹数"]), 10, 64)

		products = append(products, ParsedProduct{
			ProductName:   name,
			Spec:          colVal(row, idx["规格型号"]),
			Color:         colVal(row, idx["颜色"]),
			UnitRolls:     rolls,
			StockQuantity: stripUnit(colVal(row, idx["库存数量"])),
			CostPrice:     stripCurrency(colVal(row, idx["成本均价"])),
			SalesPrice:    stripCurrency(colVal(row, idx["参考售价"])),
			Remark:        colVal(row, idx["备注"]),
		})
	}

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

func buildIndex(headers []string) map[string]int {
	m := make(map[string]int, len(headers))
	for i, h := range headers {
		m[strings.TrimSpace(h)] = i
	}
	return m
}

func colVal(row []string, idx int) string {
	if idx < 0 || idx >= len(row) {
		return ""
	}
	return strings.TrimSpace(row[idx])
}

// stripUnit removes trailing unit markers like "米", "kg", etc.
func stripUnit(s string) string {
	s = strings.TrimSpace(s)
	for _, suffix := range []string{"米", "m", "kg", "KG"} {
		s = strings.TrimSuffix(s, suffix)
	}
	s = strings.TrimSpace(s)
	if s == "" {
		return "0"
	}
	return s
}

// stripCurrency removes leading ¥ / $ / ￥ symbols.
func stripCurrency(s string) string {
	s = strings.TrimSpace(s)
	for _, prefix := range []string{"¥", "￥", "$", "＄"} {
		s = strings.TrimPrefix(s, prefix)
	}
	s = strings.TrimSpace(s)
	if s == "" {
		return "0"
	}
	return s
}