using ZB.MOM.WW.SPHistorianClient.Models;

namespace ZB.MOM.WW.SPHistorianClient.Tests;

/// <summary>
/// Live integration tests for the 2023 R2 RemoteGrpc transport. Gated on a dedicated
/// <c>HISTORIAN_GRPC_HOST</c> env var (plus <c>HISTORIAN_TEST_TAG</c>) so they skip cleanly until
/// a 2023 R2 Historian is available. Optional:
///   HISTORIAN_GRPC_PORT (default 32565), HISTORIAN_GRPC_TLS (true/false),
///   HISTORIAN_USER / HISTORIAN_PASSWORD (explicit creds; otherwise IntegratedSecurity),
///   HISTORIAN_GRPC_DNSID (server certificate name when connecting by IP over TLS).
/// </summary>
public sealed class HistorianGrpcIntegrationTests
{
    [Fact]
    public async Task ReadRawAsync_OverGrpc_ReturnsAtLeastOneRow()
    {
        string? host = Environment.GetEnvironmentVariable("HISTORIAN_GRPC_HOST");
        string? testTag = Environment.GetEnvironmentVariable("HISTORIAN_TEST_TAG");
        if (string.IsNullOrWhiteSpace(host) || string.IsNullOrWhiteSpace(testTag))
        {
            return;
        }

        HistorianClient client = new(BuildOptions(host));

        DateTime endUtc = DateTime.UtcNow;
        DateTime startUtc = endUtc - TimeSpan.FromDays(7);

        List<HistorianSample> samples = [];
        await foreach (HistorianSample sample in client.ReadRawAsync(testTag, startUtc, endUtc, maxValues: 8, CancellationToken.None))
        {
            samples.Add(sample);
        }

        Assert.NotEmpty(samples);
        Assert.All(samples, s => Assert.Equal(testTag, s.TagName));
    }

    private static HistorianClientOptions BuildOptions(string host)
    {
        string? user = Environment.GetEnvironmentVariable("HISTORIAN_USER");
        string? password = Environment.GetEnvironmentVariable("HISTORIAN_PASSWORD");
        bool explicitCreds = !string.IsNullOrEmpty(user);
        int port = int.TryParse(Environment.GetEnvironmentVariable("HISTORIAN_GRPC_PORT"), out int parsed)
            ? parsed
            : HistorianClientOptions.DefaultGrpcPort;
        bool tls = string.Equals(Environment.GetEnvironmentVariable("HISTORIAN_GRPC_TLS"), "true", StringComparison.OrdinalIgnoreCase);

        return new HistorianClientOptions
        {
            Host = host,
            Port = port,
            Transport = HistorianTransport.RemoteGrpc,
            GrpcUseTls = tls,
            AllowUntrustedServerCertificate = tls,
            ServerDnsIdentity = Environment.GetEnvironmentVariable("HISTORIAN_GRPC_DNSID"),
            IntegratedSecurity = !explicitCreds,
            UserName = user ?? string.Empty,
            Password = password ?? string.Empty
        };
    }
}