using System.Net.Http.Json;
using System.Text.Json.Serialization;
namespace Sbroenne.ExcelMcp.McpServer.Infrastructure;
/// <summary>
/// Checks NuGet for the latest version of the MCP Server package.
/// </summary>
internal static class NuGetVersionChecker
{
private const string PackageId = "sbroenne.excelmcp.mcpserver";
private const string NuGetIndexUrl = $"https://api.nuget.org/v3-flatcontainer/{PackageId}/index.json";
private static readonly TimeSpan Timeout = TimeSpan.FromSeconds(5);
/// <summary>
/// Checks NuGet for the latest version of the MCP Server package.
/// </summary>
/// <returns>Latest version string, or null if check failed.</returns>
public static async Task<string?> GetLatestVersionAsync(CancellationToken cancellationToken = default)
{
try
{
using var httpClient = new HttpClient { Timeout = Timeout };
var response = await httpClient.GetFromJsonAsync<NuGetVersionsResponse>(NuGetIndexUrl, cancellationToken);
if (response?.Versions == null || response.Versions.Count == 0)
return null;
// Get highest non-prerelease version
var latestVersion = response.Versions
.Where(v => !v.Contains('-')) // Exclude prerelease versions
.OrderByDescending(v => ParseVersion(v))
.FirstOrDefault();
return latestVersion ?? response.Versions.Last();
}
catch (Exception)
{
// Network error, timeout, etc. — return null to indicate check failed
return null;
}
}
private static Version ParseVersion(string versionString)
{
// Handle versions like "1.2.3" - strip any suffix after +
var cleanVersion = versionString.Split('+')[0].Split('-')[0];
return Version.TryParse(cleanVersion, out var version) ? version : new Version(0, 0, 0);
}
private sealed class NuGetVersionsResponse
{
[JsonPropertyName("versions")]
public List<string> Versions { get; set; } = [];
}
}
