using System;
using System.Collections.Generic;
using AcDream.Core.Physics;
using DatReaderWriter.DBObjs;
using DatReaderWriter.Enums;
using DatReaderWriter.Types;
using Xunit;

namespace AcDream.Core.Tests.Physics;

/// <summary>
/// Guards the DAT-only shape-source rule (Slice 1 of the unified
/// collision-inclusion phase, 2026-06-24).
///
/// <para>
/// Retail oracle: <c>CPartArray::InitParts@0x00517F40</c> (parts come from
/// the Setup list only), <c>CGfxObj::Serialize@0x00534970</c> (physics_bsp
/// gated on serialized-flags bit-0), <c>CPhysicsPart::find_obj_collisions@0x0050D8D0</c>
/// (returns OK / passable when <c>physics_bsp == null</c>). Render-mesh bounds
/// never enter collision.
/// </para>
/// </summary>
public class ShadowShapeBuilderShapeSourceTests
{
    // Retail: an object with no DAT physics shape (no CylSphere, no Sphere,
    // no part with a PhysicsBSP) emits NO collision shape and is passable.
    // CPhysicsPart::find_obj_collisions@0x0050D8D0 returns OK when physics_bsp==null.
    [Fact]
    public void Setup_WithNoCylSpheres_NoSpheres_NoPhysicsBspParts_YieldsEmptyShapeList()
    {
        var setup = new Setup
        {
            CylSpheres      = new List<CylSphere>(),
            Spheres         = new List<Sphere>(),
            Parts           = { 0x01000ABCu },
            PlacementFrames = new Dictionary<Placement, AnimationFrame>(),
        };
        var shapes = ShadowShapeBuilder.FromSetup(setup, entScale: 1f, hasPhysicsBsp: _ => false);
        Assert.Empty(shapes);
    }
}