71 lines
2.8 KiB
C#
71 lines
2.8 KiB
C#
using System.Collections.Generic;
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using UnityEngine;
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namespace BaseGames.Enemies.Abilities
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{
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/// <summary>
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/// 多攻击选招器：从候选（category==Attack）里按"射程 + 冷却 + LOS + 着地"过滤，
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/// 再按 <see cref="AttackSelectionMode"/> 选一个。纯逻辑、无 MonoBehaviour 依赖，可单测。
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/// </summary>
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public sealed class EnemyAttackSelector
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{
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private readonly List<IAttackCandidate> _candidates;
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// 权重缓冲区（与 _candidates 等长，每次选招复用）：避免每次选招 new List 造成 GC
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private readonly List<float> _weightBuf;
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public EnemyAttackSelector(IEnumerable<IAttackCandidate> candidates)
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{
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_candidates = new List<IAttackCandidate>(candidates);
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_weightBuf = new List<float>(_candidates.Count);
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}
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public int Count => _candidates.Count;
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private static bool Eligible(IAttackCandidate c, bool hasLOS, bool grounded)
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=> c != null && c.CanUse && c.InAttackRange()
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&& (!c.RequiresLineOfSight || hasLOS)
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&& (!c.RequiresGrounded || grounded);
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public bool HasEligible(bool hasLOS, bool grounded)
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{
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for (int i = 0; i < _candidates.Count; i++)
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if (Eligible(_candidates[i], hasLOS, grounded)) return true;
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return false;
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}
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public IAttackCandidate Select(bool hasLOS, bool grounded, AttackSelectionMode mode)
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=> mode == AttackSelectionMode.Priority
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? SelectByPriority(hasLOS, grounded)
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: SelectByWeight(hasLOS, grounded);
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private IAttackCandidate SelectByPriority(bool hasLOS, bool grounded)
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{
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IAttackCandidate best = null;
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for (int i = 0; i < _candidates.Count; i++)
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{
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var c = _candidates[i];
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if (!Eligible(c, hasLOS, grounded)) continue;
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if (best == null || c.Priority > best.Priority) best = c; // 并列取首个
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}
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return best;
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}
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private IAttackCandidate SelectByWeight(bool hasLOS, bool grounded)
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{
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// 有效权重：不合格候选填 0（由共享原语保证零权重项绝不被选中）。缓冲区复用 → 选招零 GC。
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_weightBuf.Clear();
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for (int i = 0; i < _candidates.Count; i++)
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{
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var c = _candidates[i];
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_weightBuf.Add(Eligible(c, hasLOS, grounded) ? Mathf.Max(0f, c.Weight) : 0f);
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}
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int idx = BaseGames.Core.WeightedPick.Index(_weightBuf);
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if (idx >= 0) return _candidates[idx];
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// 无正权重（合格候选权重全 0）→ 退化为按 Priority 选(并列取首个)
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return SelectByPriority(hasLOS, grounded);
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}
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}
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}
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