package services

import (
	"crypto/sha256"
	"encoding/hex"
	"strings"
)

// NormalizeIDCard 归一化身份证号（去空格、末位 X 大写）
func NormalizeIDCard(idCard string) string {
	idCard = strings.TrimSpace(idCard)
	return strings.ToUpper(idCard)
}

// HashIDCard 计算身份证号 SHA256 哈希，用于索引与匹配
func HashIDCard(idCard string) string {
	sum := sha256.Sum256([]byte(NormalizeIDCard(idCard)))
	return hex.EncodeToString(sum[:])
}

// MaskIDCard 脱敏展示：350681********0611
func MaskIDCard(idCard string) string {
	id := NormalizeIDCard(idCard)
	if len(id) <= 10 {
		return id
	}
	return id[:6] + "********" + id[len(id)-4:]
}

// IdentityParams 从请求参数中提取的身份证与姓名
type IdentityParams struct {
	IDCard string
	Name   string
	OK     bool
}

// ExtractIdentityParams 从解密后的 params map 提取 id_card + name
func ExtractIdentityParams(params map[string]interface{}) IdentityParams {
	idCard := firstNonEmptyString(params, "id_card", "idCard")
	name := firstNonEmptyString(params, "name")
	if idCard == "" {
		return IdentityParams{OK: false}
	}
	return IdentityParams{
		IDCard: NormalizeIDCard(idCard),
		Name:   strings.TrimSpace(name),
		OK:     true,
	}
}

func firstNonEmptyString(params map[string]interface{}, keys ...string) string {
	for _, key := range keys {
		v, ok := params[key]
		if !ok {
			continue
		}
		if s, ok := v.(string); ok {
			s = strings.TrimSpace(s)
			if s != "" {
				return s
			}
		}
	}
	return ""
}