using AcDream.Core.Net;
using Xunit;

namespace AcDream.Core.Net.Tests;

public sealed class WorldSessionLinkStatusTests
{
    [Theory]
    [InlineData(WorldSession.State.Disconnected)]
    [InlineData(WorldSession.State.Failed)]
    public void DisconnectedStates_DoNotPublishPacketAge(WorldSession.State state)
    {
        LinkStatusSnapshot snapshot = WorldSession.BuildLinkStatus(
            state, lastInboundPacketTicks: 100, nowTicks: 900, frequency: 100);

        Assert.False(snapshot.Connected);
        Assert.Equal(0d, snapshot.SecondsSinceLastPacket);
    }

    [Theory]
    [InlineData(WorldSession.State.Handshaking)]
    [InlineData(WorldSession.State.InCharacterSelect)]
    [InlineData(WorldSession.State.EnteringWorld)]
    [InlineData(WorldSession.State.InWorld)]
    public void ConnectedStates_PublishMonotonicPacketAge(WorldSession.State state)
    {
        LinkStatusSnapshot snapshot = WorldSession.BuildLinkStatus(
            state, lastInboundPacketTicks: 100, nowTicks: 850, frequency: 100);

        Assert.True(snapshot.Connected);
        Assert.Equal(7.5d, snapshot.SecondsSinceLastPacket);
    }

    [Fact]
    public void ClockRegression_ClampsPacketAgeToZero()
    {
        LinkStatusSnapshot snapshot = WorldSession.BuildLinkStatus(
            WorldSession.State.InWorld,
            lastInboundPacketTicks: 200,
            nowTicks: 100,
            frequency: 100);

        Assert.True(snapshot.Connected);
        Assert.Equal(0d, snapshot.SecondsSinceLastPacket);
    }
}