using System.Net;
using Shouldly;
using Xunit;
using ZB.MOM.WW.OtOpcUa.Core.Abstractions;

namespace ZB.MOM.WW.OtOpcUa.Driver.MTConnect.Tests;

/// <summary>
///     Review 2026-10-21 R06:T-8 — the driver logged and surfaced the raw <c>AgentUri</c> (which may carry
///     <c>user:pass@</c>) as its <c>HostName</c>, in every log line and in exception messages that reach
///     <c>DriverHealth.LastError</c> → <c>/hosts</c>, while its own Test-Connect probe deliberately redacted it.
/// </summary>
public sealed class MTConnectUriRedactionTests
{
    private const string Secret = "s3cretPw";
    private const string CredentialedUri = "http://operator:" + Secret + "@fixture-agent:5000";

    private static CancellationToken Ct => TestContext.Current.CancellationToken;

    [Theory]
    [InlineData("http://fixture-agent:5000", "http://fixture-agent:5000")]                 // unchanged when clean
    [InlineData("http://agent:5000/prefix", "http://agent:5000/prefix")]
    [InlineData("http://u:p@agent:5000", "http://agent:5000")]
    [InlineData("https://u:p@agent/prefix?token=abc", "https://agent/prefix")]
    [InlineData("not a uri with u:p@host", MTConnectUriRedaction.Unparseable)]
    [InlineData("not-a-uri", "not-a-uri")]
    public void The_configured_uri_loses_its_user_info(string raw, string expected) =>
        MTConnectUriRedaction.Redact(raw).ShouldBe(expected);

    [Fact]
    public void A_request_uri_loses_its_user_info_and_keeps_its_query() =>
        MTConnectUriRedaction.Redact(new Uri("http://u:p@agent:5000/sample?from=5&count=10"))
            .ShouldBe("http://agent:5000/sample?from=5&count=10");

    /// <summary>The host key, every log line and the health text of a credentialed driver carry no password.</summary>
    [Fact]
    public async Task A_credentialed_agent_uri_never_reaches_host_name_logs_or_health()
    {
        var logger = new RecordingDriverLogger();
        var client = CannedAgentClient.FromFixtures();
        var driver = new MTConnectDriver(
            new MTConnectDriverOptions
            {
                AgentUri = CredentialedUri,
                RequestTimeoutMs = 200,
                Tags = [new MTConnectTagDefinition("dev1_pos", DriverDataType.Float64)],
            },
            "mt-t8",
            _ => client,
            logger);
        await driver.InitializeAsync("{}", Ct);
        try
        {
            // A /current that never answers: the read times out, degrades health and logs a Warning.
            client.CurrentGate = new TaskCompletionSource();
            await driver.ReadAsync(["dev1_pos"], Ct);

            var health = driver.GetHealth();
            health.State.ShouldBe(DriverState.Degraded, "positive control: the failure path that carries the URI ran");
            health.LastError.ShouldNotBeNull().ShouldNotContain(Secret);
            health.LastError.ShouldContain("fixture-agent:5000", Case.Sensitive, "the host is still named");

            driver.HostName.ShouldBe("http://fixture-agent:5000");
            ((IHostConnectivityProbe)driver).GetHostStatuses().ShouldAllBe(s => !s.HostName.Contains(Secret));

            var lines = logger.AllSnapshot();
            lines.ShouldNotBeEmpty("positive control: the initialize line and the read warning were logged");
            lines.ShouldContain(l => l.Contains("fixture-agent:5000"));
            lines.ShouldAllBe(l => !l.Contains(Secret));
        }
        finally
        {
            client.CurrentGate?.TrySetResult();
            await driver.ShutdownAsync(CancellationToken.None);
        }
    }

    /// <summary>The production client's own exception messages (they become health text) carry no password.</summary>
    [Fact]
    public async Task The_client_timeout_message_carries_no_password()
    {
        using var handler = new HangingHandler();
        using var client = new MTConnectAgentClient(
            new MTConnectDriverOptions { AgentUri = CredentialedUri, RequestTimeoutMs = 200 }, handler);

        var ex = await Should.ThrowAsync<TimeoutException>(async () => await client.CurrentAsync(Ct));

        ex.Message.ShouldContain("fixture-agent:5000");
        ex.Message.ShouldNotContain(Secret);
    }

    /// <summary>The stream-ended exception (it becomes the pump's Degrade text) carries no password.</summary>
    [Fact]
    public async Task The_client_stream_messages_carry_no_password()
    {
        using var handler = new SingleDocumentHandler();
        using var client = new MTConnectAgentClient(new MTConnectDriverOptions { AgentUri = CredentialedUri }, handler);

        var ex = await Should.ThrowAsync<MTConnectStreamNotSupportedException>(async () =>
        {
            await foreach (var _ in client.SampleAsync(1, Ct)) { }
        });

        ex.Message.ShouldContain("fixture-agent:5000");
        ex.Message.ShouldNotContain(Secret);
    }

    private sealed class HangingHandler : HttpMessageHandler
    {
        protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
        {
            await Task.Delay(Timeout.Infinite, cancellationToken);
            return new HttpResponseMessage(HttpStatusCode.OK);
        }
    }

    private sealed class SingleDocumentHandler : HttpMessageHandler
    {
        protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) =>
            Task.FromResult(new HttpResponseMessage(HttpStatusCode.OK)
            {
                Content = new StringContent(File.ReadAllText("Fixtures/current.xml"), System.Text.Encoding.UTF8, "text/xml"),
            });
    }
}