using AcDream.Core.Physics.Motion;
using Xunit;

namespace AcDream.Core.Tests.Physics.Motion;

/// <summary>
/// Campaign P P5 (#167 / TS-35) golden values for
/// <see cref="ConstraintDistance"/> — byte-decoded from the matching retail
/// binary (docs/research/2026-07-30-constraint-leash-constants.md §1), not
/// guessed and not copied from ACE (whose start mapping is INVERTED).
/// </summary>
public sealed class ConstraintDistanceTests
{
    // Outdoor landblock cell indices are 0x0001-0x00FF (low16 < 0x0100).
    private const uint OutdoorCell = 0x12340007u;
    // EnvCell (indoor) indices are 0x0100+ .
    private const uint IndoorCell = 0x12340105u;

    [Fact]
    public void GetStartConstraintDistance_Outdoor_Is10NotAcesInverted5()
    {
        // ACE PhysicsObj.cs:620 maps outdoor start -> 5. The disassembly
        // (0x0050ebc0) says 10. The binary wins.
        Assert.Equal(10.0f, ConstraintDistance.GetStartConstraintDistance(OutdoorCell));
    }

    [Fact]
    public void GetStartConstraintDistance_Indoor_Is5()
    {
        Assert.Equal(5.0f, ConstraintDistance.GetStartConstraintDistance(IndoorCell));
    }

    [Fact]
    public void GetMaxConstraintDistance_Outdoor_Is50()
    {
        Assert.Equal(50.0f, ConstraintDistance.GetMaxConstraintDistance(OutdoorCell));
    }

    [Fact]
    public void GetMaxConstraintDistance_Indoor_Is20()
    {
        Assert.Equal(20.0f, ConstraintDistance.GetMaxConstraintDistance(IndoorCell));
    }

    [Theory]
    [InlineData(0x00FFu, false)]
    [InlineData(0x0100u, true)]
    [InlineData(0x0000u, false)]
    [InlineData(0xFFFFu, true)]
    public void IsIndoorCell_BoundaryIsLow16Ox0100(uint objCellId, bool expectedIndoor)
    {
        Assert.Equal(expectedIndoor, ConstraintDistance.IsIndoorCell(objCellId));
    }

    // The disassembly's "this == player_object" branch loads IDENTICAL
    // constants on both sides (research doc §1, "vestigial" finding) — there
    // is deliberately no player/remote parameter on this API. Pin that the
    // SAME cell always yields the SAME band regardless of which kind of
    // object (player or remote) is asking, by construction (no such
    // parameter exists to differentiate them).
    [Fact]
    public void NoPlayerVsRemoteSplit_SameCellAlwaysYieldsSameBand()
    {
        float startA = ConstraintDistance.GetStartConstraintDistance(OutdoorCell);
        float startB = ConstraintDistance.GetStartConstraintDistance(OutdoorCell);
        float maxA = ConstraintDistance.GetMaxConstraintDistance(OutdoorCell);
        float maxB = ConstraintDistance.GetMaxConstraintDistance(OutdoorCell);

        Assert.Equal(startA, startB);
        Assert.Equal(maxA, maxB);
    }
}