package ca

import (
	"crypto/hmac"
	"crypto/sha1"
	"encoding/hex"
	"hospital-admin-api/config"
	"sort"
	"strings"
)

// GenerateSignature 生成签名
func GenerateSignature(paramMap map[string]string) string {
	keys := make([]string, 0, len(paramMap))
	for k := range paramMap {
		if k == "pdfFile" {
			continue
		}
		keys = append(keys, k)
	}
	sort.Strings(keys)

	var toSign string
	for _, k := range keys {
		v := paramMap[k]
		toSign += v + "&"
	}
	toSign = strings.TrimSuffix(toSign, "&")

	// Step 3: Calculate HMAC-SHA1 and convert to hex format
	h := hmac.New(sha1.New, []byte(config.C.CaOnline.CaOnlineAppSecret))
	h.Write([]byte(toSign))
	signature := hex.EncodeToString(h.Sum(nil))

	return signature
}