namespace AVEVA.Historian.Client.Tests;

public sealed class HistorianClientIntegrationTests
{
    [Fact]
    public async Task ProbeAsync_ReturnsTrueForConfiguredHistorian()
    {
        string? host = Environment.GetEnvironmentVariable("HISTORIAN_HOST");
        if (string.IsNullOrWhiteSpace(host))
        {
            return;
        }

        int port = int.TryParse(Environment.GetEnvironmentVariable("HISTORIAN_PORT"), out int parsedPort)
            ? parsedPort
            : HistorianClientOptions.DefaultPort;
        HistorianClient client = new(new HistorianClientOptions { Host = host, Port = port });

        Assert.True(await client.ProbeAsync(CancellationToken.None));
    }

    [Fact]
    public async Task BrowseTagNamesAsync_ReturnsConfiguredTestTag()
    {
        string? host = Environment.GetEnvironmentVariable("HISTORIAN_HOST");
        string? testTag = Environment.GetEnvironmentVariable("HISTORIAN_TEST_TAG");
        string? filter = Environment.GetEnvironmentVariable("HISTORIAN_TAG_FILTER") ?? testTag;
        if (string.IsNullOrWhiteSpace(host) || string.IsNullOrWhiteSpace(testTag) || string.IsNullOrWhiteSpace(filter))
        {
            return;
        }

        int port = int.TryParse(Environment.GetEnvironmentVariable("HISTORIAN_PORT"), out int parsedPort)
            ? parsedPort
            : HistorianClientOptions.DefaultPort;
        HistorianClient client = new(new HistorianClientOptions
        {
            Host = host,
            Port = port,
            IntegratedSecurity = true,
            UserName = Environment.GetEnvironmentVariable("HISTORIAN_USER") ?? string.Empty,
            Password = Environment.GetEnvironmentVariable("HISTORIAN_PASSWORD") ?? string.Empty
        });

        List<string> tagNames = [];
        await foreach (string tagName in client.BrowseTagNamesAsync(filter, CancellationToken.None))
        {
            tagNames.Add(tagName);
        }

        Assert.Contains(testTag, tagNames);
    }

    [Fact]
    public async Task ReadRawAsync_AgainstLocalHistorian_ReturnsAtLeastOneRow()
    {
        string? host = Environment.GetEnvironmentVariable("HISTORIAN_HOST");
        string? testTag = Environment.GetEnvironmentVariable("HISTORIAN_TEST_TAG");
        if (string.IsNullOrWhiteSpace(host) || string.IsNullOrWhiteSpace(testTag))
        {
            return;
        }

        if (!string.Equals(host, "localhost", StringComparison.OrdinalIgnoreCase))
        {
            // The managed read flow currently only supports the LocalPipe transport.
            return;
        }

        if (!OperatingSystem.IsWindows())
        {
            return;
        }

        HistorianClient client = new(new HistorianClientOptions
        {
            Host = host,
            IntegratedSecurity = true,
            Transport = HistorianTransport.LocalPipe
        });

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

        List<AVEVA.Historian.Client.Models.HistorianSample> samples = [];
        await foreach (AVEVA.Historian.Client.Models.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));
    }

    [Fact]
    public async Task ReadAggregateAsync_AgainstLocalHistorian_ReturnsTimeWeightedAverageRows()
    {
        string? host = Environment.GetEnvironmentVariable("HISTORIAN_HOST");
        string? testTag = Environment.GetEnvironmentVariable("HISTORIAN_TEST_TAG");
        if (string.IsNullOrWhiteSpace(host) || string.IsNullOrWhiteSpace(testTag))
        {
            return;
        }

        if (!string.Equals(host, "localhost", StringComparison.OrdinalIgnoreCase) || !OperatingSystem.IsWindows())
        {
            return;
        }

        HistorianClient client = new(new HistorianClientOptions
        {
            Host = host,
            IntegratedSecurity = true,
            Transport = HistorianTransport.LocalPipe
        });

        DateTime endUtc = DateTime.UtcNow;
        DateTime startUtc = endUtc - TimeSpan.FromMinutes(10);

        List<AVEVA.Historian.Client.Models.HistorianAggregateSample> samples = [];
        await foreach (AVEVA.Historian.Client.Models.HistorianAggregateSample sample in client.ReadAggregateAsync(
            testTag, startUtc, endUtc,
            AVEVA.Historian.Client.Models.RetrievalMode.TimeWeightedAverage,
            TimeSpan.FromMinutes(1),
            CancellationToken.None))
        {
            samples.Add(sample);
        }

        Assert.NotEmpty(samples);
        Assert.All(samples, s => Assert.Equal(testTag, s.TagName));
        Assert.All(samples, s => Assert.Equal(AVEVA.Historian.Client.Models.RetrievalMode.TimeWeightedAverage, s.RetrievalMode));
    }

    // Verifies a previously-unmapped RetrievalMode (one of the 11 modes that prior to
    // 2026-05-04 threw ProtocolEvidenceMissingException). MinimumWithTime → QueryType=6
    // exercises the "QueryType is the native enum ordinal" mapping against the live server.
    [Theory]
    [InlineData(AVEVA.Historian.Client.Models.RetrievalMode.MinimumWithTime)]
    [InlineData(AVEVA.Historian.Client.Models.RetrievalMode.MaximumWithTime)]
    [InlineData(AVEVA.Historian.Client.Models.RetrievalMode.BestFit)]
    public async Task ReadAggregateAsync_AgainstLocalHistorian_AcceptsPreviouslyUnmappedRetrievalMode(
        AVEVA.Historian.Client.Models.RetrievalMode mode)
    {
        string? host = Environment.GetEnvironmentVariable("HISTORIAN_HOST");
        string? testTag = Environment.GetEnvironmentVariable("HISTORIAN_TEST_TAG");
        if (string.IsNullOrWhiteSpace(host) || string.IsNullOrWhiteSpace(testTag)
            || !string.Equals(host, "localhost", StringComparison.OrdinalIgnoreCase)
            || !OperatingSystem.IsWindows())
        {
            return;
        }

        HistorianClient client = new(new HistorianClientOptions
        {
            Host = host,
            IntegratedSecurity = true,
            Transport = HistorianTransport.LocalPipe
        });

        DateTime endUtc = DateTime.UtcNow;
        DateTime startUtc = endUtc - TimeSpan.FromMinutes(10);

        List<AVEVA.Historian.Client.Models.HistorianAggregateSample> samples = [];
        await foreach (AVEVA.Historian.Client.Models.HistorianAggregateSample s in client.ReadAggregateAsync(
            testTag, startUtc, endUtc, mode, TimeSpan.FromMinutes(2), CancellationToken.None))
        {
            samples.Add(s);
        }

        // Server should accept the request without error. Even if no rows come back
        // (unlikely for a 10-minute window on a steadily-counting tag), the absence of an
        // exception proves the QueryType byte was accepted.
        Assert.All(samples, s => Assert.Equal(mode, s.RetrievalMode));
    }

    [Fact]
    public async Task ReadAtTimeAsync_AgainstLocalHistorian_ReturnsRequestedTimestamps()
    {
        string? host = Environment.GetEnvironmentVariable("HISTORIAN_HOST");
        string? testTag = Environment.GetEnvironmentVariable("HISTORIAN_TEST_TAG");
        if (string.IsNullOrWhiteSpace(host) || string.IsNullOrWhiteSpace(testTag))
        {
            return;
        }

        if (!string.Equals(host, "localhost", StringComparison.OrdinalIgnoreCase) || !OperatingSystem.IsWindows())
        {
            return;
        }

        HistorianClient client = new(new HistorianClientOptions
        {
            Host = host,
            IntegratedSecurity = true,
            Transport = HistorianTransport.LocalPipe
        });

        DateTime nowUtc = DateTime.UtcNow;
        DateTime[] timestamps =
        [
            nowUtc - TimeSpan.FromMinutes(5),
            nowUtc - TimeSpan.FromMinutes(2),
            nowUtc - TimeSpan.FromMinutes(1)
        ];

        IReadOnlyList<AVEVA.Historian.Client.Models.HistorianSample> samples = await client.ReadAtTimeAsync(testTag, timestamps, CancellationToken.None);

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

    [Fact]
    public async Task ReadEventsAsync_AgainstLocalHistorian_DoesNotThrow()
    {
        string? host = Environment.GetEnvironmentVariable("HISTORIAN_HOST");
        if (string.IsNullOrWhiteSpace(host) || !string.Equals(host, "localhost", StringComparison.OrdinalIgnoreCase) || !OperatingSystem.IsWindows())
        {
            return;
        }

        HistorianClient client = new(new HistorianClientOptions
        {
            Host = host,
            IntegratedSecurity = true,
            Transport = HistorianTransport.LocalPipe
        });

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

        // The event-row WCF wire format is not yet decoded; this test verifies the chain
        // (ValCl + Open2 + Retr.IsOriginalAllowed + Retr.StartEventQuery) reaches the server
        // without throwing. An empty event list is acceptable until row parsing is wired.
        List<AVEVA.Historian.Client.Models.HistorianEvent> events = [];
        await foreach (AVEVA.Historian.Client.Models.HistorianEvent evt in client.ReadEventsAsync(startUtc, endUtc, CancellationToken.None))
        {
            events.Add(evt);
        }

        Assert.NotNull(events);
    }

    [Fact]
    public async Task GetSystemParameterAsync_AgainstLocalHistorian_ReturnsHistorianVersion()
    {
        string? host = Environment.GetEnvironmentVariable("HISTORIAN_HOST");
        if (string.IsNullOrWhiteSpace(host) || !string.Equals(host, "localhost", StringComparison.OrdinalIgnoreCase) || !OperatingSystem.IsWindows())
        {
            return;
        }

        HistorianClient client = new(new HistorianClientOptions
        {
            Host = host,
            IntegratedSecurity = true,
            Transport = HistorianTransport.LocalPipe
        });

        string? value = await client.GetSystemParameterAsync("HistorianVersion", CancellationToken.None);

        // The server returns a non-empty version string for the documented HistorianVersion parameter.
        Assert.False(string.IsNullOrWhiteSpace(value));
    }

    [Fact]
    public async Task GetConnectionStatusAsync_AgainstLocalHistorian_ReportsConnectedToServer()
    {
        string? host = Environment.GetEnvironmentVariable("HISTORIAN_HOST");
        if (string.IsNullOrWhiteSpace(host) || !string.Equals(host, "localhost", StringComparison.OrdinalIgnoreCase) || !OperatingSystem.IsWindows())
        {
            return;
        }

        HistorianClient client = new(new HistorianClientOptions
        {
            Host = host,
            IntegratedSecurity = true,
            Transport = HistorianTransport.LocalPipe
        });

        AVEVA.Historian.Client.Models.HistorianConnectionStatus status =
            await client.GetConnectionStatusAsync(CancellationToken.None);

        Assert.True(status.ConnectedToServer);
        Assert.False(status.ErrorOccurred);
        Assert.False(status.Pending);
        Assert.Equal(host, status.ServerName);
    }

    [Fact]
    public async Task GetStoreForwardStatusAsync_AgainstLocalHistorian_ReturnsDefaults()
    {
        string? host = Environment.GetEnvironmentVariable("HISTORIAN_HOST");
        if (string.IsNullOrWhiteSpace(host) || !string.Equals(host, "localhost", StringComparison.OrdinalIgnoreCase) || !OperatingSystem.IsWindows())
        {
            return;
        }

        HistorianClient client = new(new HistorianClientOptions
        {
            Host = host,
            IntegratedSecurity = true,
            Transport = HistorianTransport.LocalPipe
        });

        AVEVA.Historian.Client.Models.HistorianStoreForwardStatus status =
            await client.GetStoreForwardStatusAsync(CancellationToken.None);

        // The synthesized status returns defaults — no store-forward sidecar to probe in this build.
        Assert.False(status.ErrorOccurred);
        Assert.False(status.Pending);
        Assert.Equal(host, status.ServerName);
    }

    // The validator inside HistorianWcfTagClient now allows IntegratedSecurity=false WHEN
    // explicit UserName + Password are provided (NTLM/Kerberos with non-current-user creds).
    // It still rejects the no-credentials-at-all case since there's no way to authenticate
    // against /Hist-Integrated.
    [Fact]
    public async Task GetTagMetadataAsync_NoAuthAndNoCredentials_Throws()
    {
        HistorianClient client = new(new HistorianClientOptions
        {
            Host = "localhost",
            IntegratedSecurity = false,
            UserName = string.Empty,
            Password = string.Empty,
        });
        await Assert.ThrowsAsync<ProtocolEvidenceMissingException>(
            () => client.GetTagMetadataAsync("anytag", CancellationToken.None));
    }

    [Fact]
    public async Task GetTagMetadataAsync_ExplicitCredentials_AgainstLocalHistorian()
    {
        // Live verification of the explicit-creds tag-metadata path. Gated on
        // HISTORIAN_USER + HISTORIAN_PASSWORD being set; skips cleanly otherwise. The path
        // routes through WCF Windows transport security with Credentials.Windows.ClientCredential.
        string? host = Environment.GetEnvironmentVariable("HISTORIAN_HOST");
        string? testTag = Environment.GetEnvironmentVariable("HISTORIAN_TEST_TAG");
        string? user = Environment.GetEnvironmentVariable("HISTORIAN_USER");
        string? password = Environment.GetEnvironmentVariable("HISTORIAN_PASSWORD");
        if (string.IsNullOrWhiteSpace(host) || string.IsNullOrWhiteSpace(testTag)
            || string.IsNullOrWhiteSpace(user) || string.IsNullOrWhiteSpace(password)
            || !OperatingSystem.IsWindows())
        {
            return;
        }

        HistorianClient client = new(new HistorianClientOptions
        {
            Host = host,
            IntegratedSecurity = false,
            UserName = user,
            Password = password,
        });

        AVEVA.Historian.Client.Models.HistorianTagMetadata? metadata =
            await client.GetTagMetadataAsync(testTag, CancellationToken.None);
        Assert.NotNull(metadata);
        Assert.Equal(testTag, metadata.Name);
    }

    [Fact]
    public async Task GetTagMetadataAsync_ReturnsConfiguredTestTagMetadata()
    {
        string? host = Environment.GetEnvironmentVariable("HISTORIAN_HOST");
        string? testTag = Environment.GetEnvironmentVariable("HISTORIAN_TEST_TAG");
        if (string.IsNullOrWhiteSpace(host) || string.IsNullOrWhiteSpace(testTag))
        {
            return;
        }

        int port = int.TryParse(Environment.GetEnvironmentVariable("HISTORIAN_PORT"), out int parsedPort)
            ? parsedPort
            : HistorianClientOptions.DefaultPort;
        HistorianClient client = new(new HistorianClientOptions
        {
            Host = host,
            Port = port,
            IntegratedSecurity = true,
            UserName = Environment.GetEnvironmentVariable("HISTORIAN_USER") ?? string.Empty,
            Password = Environment.GetEnvironmentVariable("HISTORIAN_PASSWORD") ?? string.Empty
        });

        AVEVA.Historian.Client.Models.HistorianTagMetadata? metadata =
            await client.GetTagMetadataAsync(testTag, CancellationToken.None);

        Assert.NotNull(metadata);
        Assert.Equal(testTag, metadata.Name);
        Assert.NotNull(metadata.Key);
    }

    [Fact]
    public async Task EnsureTagAsync_AndDeleteTagAsync_RoundTrip_AgainstLocalHistorian()
    {
        // Per docs/plans/write-commands-reverse-engineering.md safety rules: localhost only,
        // sandbox tag name must start with "RetestSdkWrite", tag is created if missing and
        // always deleted at the end so the test leaves zero residue.
        string? host = Environment.GetEnvironmentVariable("HISTORIAN_HOST");
        string? sandboxTag = Environment.GetEnvironmentVariable("HISTORIAN_WRITE_SANDBOX_TAG");
        if (string.IsNullOrWhiteSpace(host) || !string.Equals(host, "localhost", StringComparison.OrdinalIgnoreCase) || !OperatingSystem.IsWindows())
        {
            return;
        }
        if (string.IsNullOrWhiteSpace(sandboxTag) || !sandboxTag.StartsWith("RetestSdkWrite", StringComparison.Ordinal))
        {
            return; // safety gate per the plan
        }

        HistorianClient client = new(new HistorianClientOptions
        {
            Host = host,
            IntegratedSecurity = true,
            Transport = HistorianTransport.LocalPipe
        });

        AVEVA.Historian.Client.Models.HistorianTagDefinition definition = new()
        {
            TagName = sandboxTag,
            Description = "SDK live integration test sandbox",
            EngineeringUnit = "test",
            DataType = AVEVA.Historian.Client.Models.HistorianDataType.Float,
            MinEU = 0.0,
            MaxEU = 100.0,
        };

        // Both EnsureTagAsync and DeleteTagAsync now work end-to-end against the live
        // Historian. Open2 must use write-enabled connectionMode 0x401 (not the default
        // 0x402 read-only); the EnsT2 InBuff layout is corrected to native parity (144
        // bytes incl 0x4E leading marker, no trailing 01 01 01 closing markers).
        bool ensured = await client.EnsureTagAsync(definition, CancellationToken.None);
        Assert.True(ensured, "EnsureTagAsync returned false against the live Historian.");

        bool deleted = await client.DeleteTagAsync(sandboxTag, CancellationToken.None);
        Assert.True(deleted, "DeleteTagAsync returned false against the live Historian.");
    }

    // Round-trip every live-verified analog data type + the non-default-range case. The
    // sandbox tag name is suffixed per case so the runs don't collide. Always cleans up.
    [Theory]
    [InlineData("RetestSdkWriteFloatRT", AVEVA.Historian.Client.Models.HistorianDataType.Float, 0.0, 100.0, 0.0, 100.0)]
    [InlineData("RetestSdkWriteDoubleRT", AVEVA.Historian.Client.Models.HistorianDataType.Double, 0.0, 100.0, 0.0, 100.0)]
    [InlineData("RetestSdkWriteInt2RT", AVEVA.Historian.Client.Models.HistorianDataType.Int2, 0.0, 100.0, 0.0, 100.0)]
    [InlineData("RetestSdkWriteInt4RT", AVEVA.Historian.Client.Models.HistorianDataType.Int4, 0.0, 100.0, 0.0, 100.0)]
    [InlineData("RetestSdkWriteUInt4RT", AVEVA.Historian.Client.Models.HistorianDataType.UInt4, 0.0, 100.0, 0.0, 100.0)]
    [InlineData("RetestSdkWriteFloatRangesRT", AVEVA.Historian.Client.Models.HistorianDataType.Float, -50.0, 200.0, 10.0, 4095.0)]
    public async Task EnsureTagAsync_AndDeleteTagAsync_RoundTrip_PerDataTypeAndRange(
        string sandboxTag,
        AVEVA.Historian.Client.Models.HistorianDataType dataType,
        double minEU, double maxEU, double minRaw, double maxRaw)
    {
        string? host = Environment.GetEnvironmentVariable("HISTORIAN_HOST");
        if (string.IsNullOrWhiteSpace(host) || !string.Equals(host, "localhost", StringComparison.OrdinalIgnoreCase) || !OperatingSystem.IsWindows())
        {
            return;
        }

        HistorianClient client = new(new HistorianClientOptions
        {
            Host = host,
            IntegratedSecurity = true,
            Transport = HistorianTransport.LocalPipe
        });

        AVEVA.Historian.Client.Models.HistorianTagDefinition definition = new()
        {
            TagName = sandboxTag,
            Description = $"SDK round-trip {dataType}",
            EngineeringUnit = "test",
            DataType = dataType,
            MinEU = minEU,
            MaxEU = maxEU,
            MinRaw = minRaw,
            MaxRaw = maxRaw,
        };

        try
        {
            bool ensured = await client.EnsureTagAsync(definition, CancellationToken.None);
            Assert.True(ensured, $"EnsureTagAsync({dataType}) returned false against the live Historian.");
        }
        finally
        {
            // Always clean up — DeleteTagAsync returns true on a freshly-created tag.
            await client.DeleteTagAsync(sandboxTag, CancellationToken.None);
        }
    }

    [Fact]
    public async Task GetTagMetadataAsync_PopulatesDescriptionAndEuRangeForAnalogTag()
    {
        string? host = Environment.GetEnvironmentVariable("HISTORIAN_HOST");
        if (string.IsNullOrWhiteSpace(host) || !string.Equals(host, "localhost", StringComparison.OrdinalIgnoreCase) || !OperatingSystem.IsWindows())
        {
            return;
        }

        // SysTimeSec is a built-in analog UInt16 tag with non-empty Description, MaxEU,
        // and an EngineeringUnit. Verifies the parser populates those new fields end-to-end.
        const string analogTag = "SysTimeSec";
        HistorianClient client = new(new HistorianClientOptions
        {
            Host = host,
            IntegratedSecurity = true,
            Transport = HistorianTransport.LocalPipe
        });

        AVEVA.Historian.Client.Models.HistorianTagMetadata? metadata =
            await client.GetTagMetadataAsync(analogTag, CancellationToken.None);

        Assert.NotNull(metadata);
        Assert.Equal(analogTag, metadata.Name);
        Assert.False(string.IsNullOrWhiteSpace(metadata.Description));
        Assert.NotNull(metadata.MaxRaw);
        Assert.True(metadata.MaxRaw is > 0 and <= 1e15);
        Assert.False(string.IsNullOrWhiteSpace(metadata.EngineeringUnit));
    }
}