package spec

import "strings"

// ParsedShopeeSpec 是从顺运宝规格原文中确定性得到的蝦皮规格字段。
// 解析器只接受“颜色,尺码”这种明确的二维格式，不做语义猜测。
type ParsedShopeeSpec struct {
	Color  string
	Size   string
	Advice string
}

// ParseShopeeSpec 解析顺运宝常见的“颜色,尺码【建议范围】”格式。
// 返回 false 表示格式不明确，调用方应保留原文且不得写入结构化字段。
func ParseShopeeSpec(raw string) (ParsedShopeeSpec, bool) {
	normalized := strings.ReplaceAll(strings.TrimSpace(raw), "，", ",")
	if strings.Count(normalized, ",") != 1 {
		return ParsedShopeeSpec{}, false
	}
	parts := strings.SplitN(normalized, ",", 2)
	color, sizePart := strings.TrimSpace(parts[0]), strings.TrimSpace(parts[1])
	if color == "" || sizePart == "" {
		return ParsedShopeeSpec{}, false
	}

	size, advice := sizePart, ""
	if bracket := strings.Index(sizePart, "【"); bracket >= 0 {
		if !strings.HasSuffix(sizePart, "】") || strings.Count(sizePart, "【") != 1 || strings.Count(sizePart, "】") != 1 {
			return ParsedShopeeSpec{}, false
		}
		size = strings.TrimSpace(sizePart[:bracket])
		advice = strings.TrimSpace(strings.TrimSuffix(sizePart[bracket+len("【"):], "】"))
		for _, prefix := range []string{"建议", "建議", "推荐", "推薦"} {
			advice = strings.TrimSpace(strings.TrimPrefix(advice, prefix))
		}
		if advice == "" {
			return ParsedShopeeSpec{}, false
		}
	}
	size = strings.ToUpper(strings.TrimSpace(size))
	if !isRecognizedSize(size) {
		return ParsedShopeeSpec{}, false
	}
	return ParsedShopeeSpec{Color: color, Size: size, Advice: advice}, true
}

func isRecognizedSize(size string) bool {
	switch size {
	case "XXXS", "XXS", "XS", "S", "M", "L", "XL", "XXL", "XXXL",
		"2XL", "3XL", "4XL", "5XL", "6XL", "7XL", "8XL", "9XL",
		"F", "FREE", "均码", "均碼":
		return true
	default:
		return false
	}
}