using System;

using FrostFS.SDK.Client.Mappers.GRPC;
using FrostFS.SDK.Proto.Interfaces;
using FrostFS.Session;

namespace FrostFS.SDK.Client;

public static class RequestConstructor
{
    public static void AddMetaHeader(this IRequest request,
        string[] xHeaders,
        SessionToken? sessionToken = null)
    {
        if (request is null)
            throw new ArgumentNullException(nameof(request));

        if (request.MetaHeader is not null)
            return;

        var metaHeader = MetaHeader.Default();
        metaHeader.Ttl = 2;

        request.MetaHeader = metaHeader.ToMessage();

        if (sessionToken != null)
            request.MetaHeader.SessionToken = sessionToken;

        if (xHeaders != null && xHeaders.Length > 0)
        {
            if (xHeaders.Length % 2 != 0)
                throw new ArgumentException("xHeaders with odd length");

            for (var i = 0; i < xHeaders.Length; i += 2)
            {
                request.MetaHeader.XHeaders.Add(new XHeader { Key = xHeaders[i], Value = xHeaders[i + 1] });
            }
        }
    }
}