Cielonos/Assets/Scripts/MainGame/Characters/Player/View/CameraFovSubmodule.cs

using Cielonos.MainGame.Effects.Feedback;
using DG.Tweening;
using Unity.Cinemachine;
using UnityEngine;

namespace Cielonos.MainGame.Characters
{
    public class CameraFovSubmodule : SubmoduleBase<PlayerViewSubcontroller>
    {
        private Player player => owner.player;
        private PlayerViewSubcontroller viewSc => owner;

        [Header("基础FOV配置")] [Tooltip("静止时的基础FOV")]
        public float baseFov = 45f;

        [Tooltip("FOV最小值")] public float minFov = 40f;

        [Tooltip("FOV最大值（疾奔时）")] public float maxFov = 55f;

        [Header("速度阈值")] [Tooltip("开始FOV变化的最小速度")]
        public float speedThreshold = 3f;

        [Tooltip("达到最大FOV的速度")] public float maxSpeedThreshold = 15f;

        [Header("过渡设置")] [Tooltip("FOV变化的速度")] public float fovChangeSpeed = 5f;

        [Tooltip("是否平滑过渡FOV")] public bool useSmoothTransition = true;

        private float currentFov;
        private float targetFov;
        private CinemachineCamera currentCamera => viewSc.currentCamera;

        public CameraFovSubmodule(PlayerViewSubcontroller owner, float baseFov, float minFov, 
            float maxFov, float speedThreshold, float maxSpeedThreshold, float fovChangeSpeed, bool useSmoothTransition) : base(owner)
        {
            this.baseFov = baseFov;
            this.minFov = minFov;
            this.maxFov = maxFov;
            this.speedThreshold = speedThreshold;
            this.maxSpeedThreshold = maxSpeedThreshold;
            this.fovChangeSpeed = fovChangeSpeed;
            this.useSmoothTransition = useSmoothTransition;
            this.currentFov = baseFov;
            this.targetFov = baseFov;
        }

        /// <summary>
        /// 根据水平速度更新FOV
        /// </summary>
        /// <param name="horizontalSpeed">水平速度（单位/秒）</param>
        /// <param name="deltaTime">帧时间</param>
        public void UpdateFovBySpeed(float horizontalSpeed, float deltaTime)
        {
            // 计算目标FOV
            targetFov = CalculateTargetFov(horizontalSpeed);

            // 平滑过渡
            if (useSmoothTransition)
            {
                currentFov = Mathf.Lerp(currentFov, targetFov, deltaTime * fovChangeSpeed);
            }
            else
            {
                currentFov = targetFov;
            }

            // 应用FOV
            ApplyFov(currentFov);
        }

        /// <summary>
        /// 根据速度计算目标FOV
        /// </summary>
        private float CalculateTargetFov(float speed)
        {
            if (speed < speedThreshold)
            {
                return baseFov;
            }

            // 使用InverseLerp将速度映射到0-1范围
            float t = Mathf.InverseLerp(speedThreshold, maxSpeedThreshold, speed);
            // 使用SmoothStep使过渡更平滑
            t = Mathf.SmoothStep(0f, 1f, t);

            return Mathf.Lerp(baseFov, maxFov, t);
        }

        /// <summary>
        /// 应用FOV到相机
        /// </summary>
        private void ApplyFov(float fov)
        {
            fov = Mathf.Clamp(fov, minFov, maxFov);

            LensSettings lens = currentCamera.Lens;
            lens.FieldOfView = fov;
            currentCamera.Lens = lens;
        }

        /// <summary>
        /// 立即设置FOV（不使用平滑过渡）
        /// </summary>
        public void SetFovImmediate(float fov)
        {
            currentFov = fov;
            targetFov = fov;
            ApplyFov(fov);
        }

        /// <summary>
        /// 平滑过渡到指定FOV
        /// </summary>
        public void SetFovSmooth(float targetFovValue, float duration)
        {
            DOTween.To(() => currentFov, x =>
                {
                    currentFov = x;
                    ApplyFov(x);
                }, targetFovValue, duration)
                .SetEase(Ease.OutQuad);

            targetFov = targetFovValue;
        }

        /// <summary>
        /// 重置为默认FOV
        /// </summary>
        public void ResetToBaseFov()
        {
            targetFov = baseFov;
        }
    }
}