using Shouldly;
using Xunit;

namespace ZB.MOM.WW.OtOpcUa.Driver.Historian.QuestDb.Tests;

public sealed class QuestDbWalVisibilityTests
{
    [Fact]
    public async Task Timeout_zero_skips_the_wait_without_touching_the_database()
    {
        // Port 1 refuses connections: any attempt to query would throw, so returning true proves nothing was opened.
        var conn = new QuestDbConnection(new QuestDbHistorianOptions { ConnectionString = "Host=127.0.0.1;Port=1;Timeout=1" });
        var wal = new QuestDbWalVisibility(conn, TimeSpan.Zero);
        wal.Disabled.ShouldBeTrue();
        (await wal.WaitAsync("hist_sample", CancellationToken.None)).ShouldBeTrue();
    }

    [Fact]
    public async Task A_positive_timeout_does_touch_the_database_control()
    {
        var conn = new QuestDbConnection(new QuestDbHistorianOptions { ConnectionString = "Host=127.0.0.1;Port=1;Timeout=1" });
        var wal = new QuestDbWalVisibility(conn, TimeSpan.FromSeconds(1));
        wal.Disabled.ShouldBeFalse();
        await Should.ThrowAsync<Exception>(() => wal.WaitAsync("hist_sample", CancellationToken.None));
    }

    [Theory]
    [InlineData(5, 5, true)]
    [InlineData(6, 5, true)]
    [InlineData(4, 5, false)]
    public void Reached_is_writerTxn_at_or_beyond_the_target(long writer, long target, bool expected) =>
        QuestDbWalVisibility.Reached(writer, target).ShouldBe(expected);
}