package allocaterequest

import (
	"crypto/sha256"
	"encoding/hex"
	"encoding/json"
	"regexp"
	"sort"
	"strings"

	"github.com/gogf/gf/v2/errors/gerror"
)

var validID = regexp.MustCompile(`^[A-Za-z0-9_-]{16,96}$`)

func Key(tenant string, user int64, requestID string) (string, error) {
	requestID = strings.TrimSpace(requestID)
	if tenant == "" || user <= 0 || !validID.MatchString(requestID) {
		return "", gerror.New("划拨请求标识无效")
	}
	value, err := json.Marshal([]any{tenant, user, "allocate", requestID})
	if err != nil {
		return "", gerror.Wrap(err, "生成划拨请求标识失败")
	}
	digest := sha256.Sum256(value)
	return hex.EncodeToString(digest[:]), nil
}

func Fingerprint(cards []string, source, target int64, mode int, remark string) string {
	sorted := append([]string(nil), cards...)
	sort.Strings(sorted)
	value, _ := json.Marshal([]any{sorted, source, target, mode, strings.TrimSpace(remark)})
	digest := sha256.Sum256(value)
	return hex.EncodeToString(digest[:])
}