using AcDream.App.Rendering.Wb;
using Xunit;

namespace AcDream.App.Tests.Rendering.Wb;

/// <summary>
/// A7 Fix D round 2 — pins retail's <c>useSunlight</c> gate for per-object torch
/// lighting (<c>WbDrawDispatcher.IndoorObjectReceivesTorches</c>). Retail enables
/// the static wall-torches on an object ONLY in the indoor stage
/// (<c>DrawMeshInternal</c> 0x0059f398: <c>if (useSunlight == 0) minimize_object_lighting()</c>),
/// so OUTDOOR objects — building exterior shells (null ParentCellId) and outdoor
/// scenery (land sub-cell 0x0001..0x00FF) — get the sun, never torches. Only
/// EnvCell-parented (indoor, low word &gt;= 0x0100) objects receive torches.
/// </summary>
public sealed class WbDrawDispatcherTorchGateTests
{
    [Fact]
    public void BuildingShell_NullParent_IsOutdoor_NoTorches()
    {
        // Building exterior shells are top-level landblock stabs with no
        // ParentCellId (LandblockLoader sets BuildingShellAnchorCellId, not Parent).
        Assert.False(WbDrawDispatcher.IndoorObjectReceivesTorches(null));
    }

    [Theory]
    [InlineData(0xA9B4_0001u)] // outdoor land sub-cell
    [InlineData(0xA9B4_0020u)] // outdoor land sub-cell
    [InlineData(0xA9B4_0040u)] // last outdoor land sub-cell (0x40)
    public void OutdoorLandCell_NoTorches(uint parentCellId)
    {
        Assert.False(WbDrawDispatcher.IndoorObjectReceivesTorches(parentCellId));
    }

    [Theory]
    [InlineData(0xA9B4_0100u)] // first EnvCell
    [InlineData(0xA9B4_0164u)] // interior EnvCell
    [InlineData(0x0007_0143u)] // dungeon EnvCell
    public void IndoorEnvCell_GetsTorches(uint parentCellId)
    {
        Assert.True(WbDrawDispatcher.IndoorObjectReceivesTorches(parentCellId));
    }
}