using System;
using System.Numerics;
using AcDream.Core.Physics;
using DatReaderWriter.Types;

namespace AcDream.Core.Rendering;

/// <summary>
/// #188 — routes <see cref="TransparentPartHook"/> animation hooks to a
/// <see cref="TranslucencyFadeManager"/>. Retail's
/// <c>TransparentPartHook::Execute</c> (0x00526cc0) is a one-liner calling
/// <c>CPhysicsObj::SetPartTranslucency(obj, part, start, end, time)</c> —
/// this sink is that same one-line forward.
///
/// <para>
/// Whole-object <see cref="TransparentHook"/> and <see cref="EtherealHook"/>
/// are deliberately NOT handled here. Retail's <c>EtherealHook::Execute</c>
/// (0x00526bc0) touches only <c>CPhysicsObj::set_ethereal</c> — collision
/// state, zero rendering coupling — and acdream's collision-passthrough
/// already applies server-authoritative via the <c>SetState</c> wire
/// message, independent of this hook firing client-side.
/// </para>
/// </summary>
public sealed class TranslucencyHookSink : IAnimationHookSink
{
    private readonly TranslucencyFadeManager _fades;

    public TranslucencyHookSink(TranslucencyFadeManager fades)
    {
        _fades = fades ?? throw new ArgumentNullException(nameof(fades));
    }

    public void OnHook(uint entityId, Vector3 entityWorldPosition, AnimationHook hook)
    {
        if (hook is not TransparentPartHook tph) return;
        _fades.StartPartFade(entityId, tph.PartIndex, tph.Start, tph.End, tph.Time);
    }
}