using System.Security.Cryptography;
using System.Text;

namespace YD_Event.Application.CitizenSports;

internal static class CitizenSportsSigner
{
    internal static string Create(string clientId, string secretKey, long unixTimestamp)
    {
        var key = Encoding.UTF8.GetBytes(secretKey);
        if (key.Length != 32)
            throw new ArgumentException("SecretKey 必须是 32 字节", nameof(secretKey));

        var plainText = Encoding.UTF8.GetBytes($"{clientId}_{unixTimestamp}");
        using var aes = Aes.Create();
        aes.Key = key;
        aes.Mode = CipherMode.ECB;
        aes.Padding = PaddingMode.PKCS7;

        using var encryptor = aes.CreateEncryptor();
        var encrypted = encryptor.TransformFinalBlock(plainText, 0, plainText.Length);
        var base64 = Convert.ToBase64String(encrypted);
        return Convert.ToHexString(Encoding.UTF8.GetBytes(base64)).ToLowerInvariant();
    }
}