Cielonos/Assets/Scripts/MainGame/Items/SupportEquipments/HummingbirdSwarmMissile.cs

using System.Collections;
using System.Collections.Generic;
using Cielonos.MainGame.Characters;
using Cielonos.MainGame.UI;
using SLSUtilities.WwiseAssistance;
using UnityEngine;

namespace Cielonos.MainGame.Inventory.Collections
{
    /// <summary>
    /// 在短时间内发射多枚随机选敌的高速追踪飞弹。
    /// </summary>
    public class HummingbirdSwarmMissile : SupportEquipmentBase
    {
        private const string MissileVfxName = "Missile";
        private const int MissileCount = 12;
        private const float LaunchDuration = 0.3f;
        private const float SearchRadius = 50f;
        private const float MissileLifeTime = 10f;
        private const float MissileSpeed = 30f;
        private const float MissileAngularSpeed = 360f;
        private const float InitialYawSpread = 90f;
        private const float InitialYawJitter = 8f;
        private const float InitialPitchSpread = 30f;

        private Transform _muzzle;

        public override void OnObtained()
        {
            base.OnObtained();
            _muzzle = player.bodyPartsSc.AuxiliaryDrone.center;
        }

        public override void OnPress(List<PlayerInputModifierType> modifiers = default)
        {
            if (!functionSm.mainFunction.IsAvailable())
            {
                PlayerCanvas.SupportEquipmentsUIArea[this].CanNotUseOutlineAnimation();
                return;
            }

            if (GetRandomTarget() == null)
            {
                PlayerCanvas.SupportEquipmentsUIArea[this].NoTargetOutlineAnimation();
                return;
            }

            StartCoroutine(LaunchSalvo());
            functionSm.mainFunction.Execute();
            PlayerCanvas.SupportEquipmentsUIArea[this].UseOutlineAnimation();
        }

        private IEnumerator LaunchSalvo()
        {
            float launchInterval = MissileCount > 1 ? LaunchDuration / (MissileCount - 1) : 0f;

            for (int missileIndex = 0; missileIndex < MissileCount; missileIndex++)
            {
                Enemy target = GetRandomTarget();
                if (target != null)
                {
                    GenerateMissile(target, missileIndex);
                }

                if (missileIndex < MissileCount - 1)
                {
                    yield return WaitForLocalTime(launchInterval);
                }
            }
        }

        private IEnumerator WaitForLocalTime(float duration)
        {
            float elapsed = 0f;
            while (elapsed < duration)
            {
                elapsed += player.selfTimeSm.DeltaTime;
                yield return null;
            }
        }

        private Enemy GetRandomTarget()
        {
            List<Enemy> candidates = CombatManager.EnemySm.Query(SearchRadius).Candidates();
            if (candidates.Count == 0)
            {
                return null;
            }

            return candidates[Random.Range(0, candidates.Count)];
        }

        private void GenerateMissile(Enemy target, int missileIndex)
        {
            AudioManager.Post(AK.EVENTS.HUMMINGBIRDSWARMMISSILE_SHOOT, _muzzle.gameObject);
            vfxData.SpawnMuzzleVFX(MissileVfxName, player, _muzzle);
            Projectile missile = vfxData.SpawnVFX(MissileVfxName, player, _muzzle)
                .GetComponentInChildren<Projectile>();

            Vector3 targetDirection = (target.CenterPoint.position - missile.transform.position).normalized;
            Vector3 initialDirection = GetInitialDirection(targetDirection, missileIndex);

            missile.Initialize(player, this, false, 1, Fraction.Enemy)
                .SetAttackSubmodule<Projectile>(attackData[MissileVfxName])
                .SetTimeSubmodule<Projectile>(MissileLifeTime)
                .SetHitSubmodule<Projectile>()
                .SetAdaptiveTraceMoveSubmodule<Projectile>(target, MissileSpeed, 0f, MissileAngularSpeed, 0f,
                    initialDirection, autoConnect: false, autoDisconnect: false, detectRadius: SearchRadius)
                .SetRaycastSubmodule<Projectile>(default, 0.2f);
            missile.hitSm.AddHitSound(AK.EVENTS.HUMMINGBIRDSWARMMISSILE_HIT);
        }

        private Vector3 GetInitialDirection(Vector3 targetDirection, int missileIndex)
        {
            float distribution = MissileCount <= 1 ? 0f : Mathf.Lerp(-InitialYawSpread, InitialYawSpread, missileIndex / (float)(MissileCount - 1));
            float yaw = distribution + Random.Range(-InitialYawJitter, InitialYawJitter);
            Vector3 direction = Quaternion.AngleAxis(yaw, Vector3.up) * targetDirection;

            Vector3 pitchAxis = Vector3.Cross(Vector3.up, direction).normalized;
            if (pitchAxis.sqrMagnitude > 0f)
            {
                float pitch = Random.Range(-InitialPitchSpread, InitialPitchSpread);
                direction = Quaternion.AngleAxis(pitch, pitchAxis) * direction;
            }

            return direction.normalized;
        }
    }
}