using AVEVA.Historian.Client.Models;
using AVEVA.Historian.Client.Wcf;

namespace AVEVA.Historian.Client.Tests;

public sealed class WcfDataQueryResultBufferTests
{
    // Captured from artifacts/reverse-engineering/instrumented-openconnection3-correlation/capture.ndjson
    // Wcf.GetNextQueryResultBuffer2.ResultBytes for a 4-row OtOpcUaParityTest_001.Counter Full read.
    private static readonly byte[] CapturedResultBytes = Convert.FromBase64String(
        "CQAEAAAA7gAAAB0AAABPAHQATwBwAGMAVQBhAFAAYQByAGkAdAB5AFQAZQBzAHQAXwAwADAAMQAu" +
        "AEMAbwB1AG4AdABlAHIAAQAAAGvPzFvD2dwBhQAAAPgAAADAAAAAAAAAAAAAAAAAAAAAAABZQAAA" +
        "AWvPzFvD2dwBAAAAAAAAAAClBtClfAAAAAAAAAAAAAAA7gAAAB0AAABPAHQATwBwAGMAVQBhAFAA" +
        "YQByAGkAdAB5AFQAZQBzAHQAXwAwADAAMQAuAEMAbwB1AG4AdABlAHIAAQAAABDWnAFA2twBAQAA" +
        "ABgAAAAYAAAAAAAAAAAAAAAAAAAAAAAAAAAAARDWnAFA2twBAAAAAAAAAAAwZOgAAAAAAAEAAAAA" +
        "AAAA7gAAAB0AAABPAHQATwBwAGMAVQBhAFAAYQByAGkAdAB5AFQAZQBzAHQAXwAwADAAMQAuAEMA" +
        "bwB1AG4AdABlAHIAAQAAAEA6hQJA2twBAQAAABgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAUA6" +
        "hQJA2twBAAAAAAAAAABQwwAAAAAAAAEAAAAAAAAA7gAAAB0AAABPAHQATwBwAGMAVQBhAFAAYQBy" +
        "AGkAdAB5AFQAZQBzAHQAXwAwADAAMQAuAEMAbwB1AG4AdABlAHIAAQAAAJD9hQJA2twBAAAAAPgA" +
        "AADAAAAAAAAAAAAAAAAAAAAAAABZQAAAAZD9hQJA2twBAAAAAAAAAAAAAAAAAAAAAAAABAAAAAAA");

    private static readonly byte[] TerminalNoMoreData = Convert.FromBase64String("BB4AAAA=");

    [Fact]
    public void TryParseGetNextQueryResultBufferRows_ParsesFourCanonicalFixtureRows()
    {
        bool ok = HistorianDataQueryProtocol.TryParseGetNextQueryResultBufferRows(
            CapturedResultBytes,
            TerminalNoMoreData,
            out IReadOnlyList<HistorianSample> rows,
            out bool hasMoreData);

        Assert.True(ok);
        Assert.False(hasMoreData);
        Assert.Equal(4, rows.Count);

        Assert.All(rows, r => Assert.Equal("OtOpcUaParityTest_001.Counter", r.TagName));

        HistorianSample row0 = rows[0];
        Assert.Equal(133, row0.Quality);
        Assert.Equal(248u, row0.QualityDetail);
        Assert.Equal(192, row0.OpcQuality);
        Assert.Equal(0, row0.NumericValue);
        Assert.Equal(100.0, row0.PercentGood);
        Assert.Equal(DateTime.FromFileTimeUtc(0x01DCD9C35BCCCF6B), row0.TimestampUtc);

        HistorianSample row3 = rows[3];
        Assert.Equal(0, row3.Quality);
        Assert.Equal(248u, row3.QualityDetail);
        Assert.Equal(192, row3.OpcQuality);
        Assert.Equal(100.0, row3.PercentGood);
    }

    [Fact]
    public void TryParseGetNextQueryResultBufferRows_FlagsContinuationWhenErrorTerminalIsEmpty()
    {
        bool ok = HistorianDataQueryProtocol.TryParseGetNextQueryResultBufferRows(
            CapturedResultBytes,
            errorTerminal: [],
            out _,
            out bool hasMoreData);

        Assert.True(ok);
        Assert.True(hasMoreData);
    }

    [Fact]
    public void TryParseGetNextQueryResultBufferRows_FlagsContinuationWhenErrorIsNotNoMoreData()
    {
        bool ok = HistorianDataQueryProtocol.TryParseGetNextQueryResultBufferRows(
            CapturedResultBytes,
            errorTerminal: [0x04, 0x01, 0x00, 0x00, 0x00],
            out _,
            out bool hasMoreData);

        Assert.True(ok);
        Assert.True(hasMoreData);
    }

    [Fact]
    public void TryParseGetNextQueryResultBufferRows_RejectsBufferWithUnsupportedVersion()
    {
        byte[] mangled = (byte[])CapturedResultBytes.Clone();
        mangled[0] = 0x07;

        bool ok = HistorianDataQueryProtocol.TryParseGetNextQueryResultBufferRows(
            mangled,
            TerminalNoMoreData,
            out IReadOnlyList<HistorianSample> rows,
            out _);

        Assert.False(ok);
        Assert.Empty(rows);
    }

    [Fact]
    public void TryParseGetNextQueryResultBufferRows_HandlesEmptyResultBuffer()
    {
        bool ok = HistorianDataQueryProtocol.TryParseGetNextQueryResultBufferRows(
            result: [],
            TerminalNoMoreData,
            out IReadOnlyList<HistorianSample> rows,
            out bool hasMoreData);

        Assert.True(ok);
        Assert.False(hasMoreData);
        Assert.Empty(rows);
    }
}