namespace Yuanshen.SDK.Handlers;

public static class TelemetryHandler
{
    private const int PreviewLimit = 1200;

    private static readonly object FileLock = new();
    private static readonly string LogPath = Path.Combine(AppContext.BaseDirectory, "client-telemetry.log");

    public static async Task<IResult> OnLog(HttpRequest request)
    {
        string body = await BodyAsync(request);
        Append(request.Path, body);
        Log.Info($"telemetry {request.Path} {body}");
        return TypedResults.Text("{\"code\":0}", "application/json");
    }

    private static void Append(string path, string body)
    {
        try
        {
            lock (FileLock)
                File.AppendAllText(LogPath, $"{DateTime.Now:HH:mm:ss} {path} {body}{Environment.NewLine}");
        }
        catch (IOException)
        {
        }
    }

    public static async Task<IResult> OnUnhandled(HttpRequest request)
    {
        string path = $"{request.Path}{request.QueryString}";
        Log.Unhandled(request.Method, path);

        if (HttpMethods.IsPost(request.Method) || HttpMethods.IsPut(request.Method))
            Log.Info($"body {await BodyAsync(request)}");

        return TypedResults.Text("{\"retcode\":0,\"message\":\"OK\",\"data\":null}", "application/json");
    }

    private static async Task<string> BodyAsync(HttpRequest request)
    {
        using StreamReader reader = new(request.Body, leaveOpen: true);
        string body = (await reader.ReadToEndAsync()).ReplaceLineEndings(" ");

        if (body.Length == 0)
            return "<empty>";

        return body.Length <= PreviewLimit ? body : body[..PreviewLimit] + $"... (+{body.Length - PreviewLimit} bytes)";
    }
}