using System.Text;

namespace EnvelopeGenerator.Application.Common.Extensions;

/// <summary>
/// Provides extension methods for decoding and extracting information from an envelope receiver ID.
/// </summary>
public static class EncodingExtensions
{
    /// <summary>
    /// 
    /// </summary>
    /// <param name="readOnlyId"></param>
    /// <returns></returns>
    public static string ToEnvelopeKey(this long readOnlyId)
    {
        //The random number is used as a salt to increase security but it is not saved in the database.
        string combinedString = $"{Random.Shared.Next()}::{readOnlyId}::{Random.Shared.Next()}";
        byte[] bytes = Encoding.UTF8.GetBytes(combinedString);
        string base64String = Convert.ToBase64String(bytes);

        return base64String;
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="input"></param>
    /// <returns></returns>
    public static string ToEnvelopeKey(this (string envelopeUuid, string receiverSignature) input)
    {
        string combinedString = $"{input.envelopeUuid}::{input.receiverSignature}";
        byte[] bytes = Encoding.UTF8.GetBytes(combinedString);
        string base64String = Convert.ToBase64String(bytes);

        return base64String;
    }
}