using System;
using MoreMountains.Feedbacks;
using Sirenix.OdinInspector;
using SLSUtilities.Feedback;
using UnityEngine;

namespace Cielonos.MainGame.Effects.Feedback
{
    /// <summary>
    /// 摄像机位移震动反馈，通过 MMCinemachinePositionShakeEvent 触发现有的 Shaker。
    /// Shaker 负责处理多个震动的叠加混合。
    /// </summary>
    [Serializable]
    public class CameraPositionShakeAction : FeedbackActionBase
    {
        public override string DisplayName => "Camera Position Shake";

        /// <summary>
        /// 震动曲线，定义震动强度随时间的变化。
        /// </summary>
        [Title("Position Shake")]
        [LabelText("Shake Curve")]
        public AnimationCurve shakeCurve = new AnimationCurve(
            new Keyframe(0f, 0f),
            new Keyframe(0.2f, 1f),
            new Keyframe(1f, 0f)
        );

        /// <summary>
        /// 最大位移振幅（本地空间）。
        /// </summary>
        [LabelText("Amplitude")]
        public Vector3 positionAmplitude = new Vector3(0.5f, 0.5f, 0f);

        /// <summary>
        /// 方向影响设置。
        /// </summary>
        [Title("Direction")]
        public CameraDirectionSettings directionSettings = new CameraDirectionSettings();

        /// <summary>
        /// 距离衰减：根据摄像机与 owner 的距离衰减震动强度。
        /// </summary>
        [Title("Distance Attenuation")]
        [LabelText("Use Attenuation")]
        public bool useAttenuation;

        /// <summary>
        /// 全强度的最大距离。
        /// </summary>
        [ShowIf("useAttenuation")]
        [LabelText("Attenuation Range")]
        public float attenuationRange = 50f;

        /// <summary>
        /// 距离-强度衰减曲线（0=近处/全强度，1=远处/无强度）。
        /// </summary>
        [ShowIf("useAttenuation")]
        [LabelText("Attenuation Curve")]
        public AnimationCurve attenuationCurve = new AnimationCurve(
            new Keyframe(0f, 1f),
            new Keyframe(1f, 0f)
        );

        public override void OnStart(FeedbackContext context)
        {
            Vector3 finalAmplitude = directionSettings.TransformAmplitude(positionAmplitude, context.owner);
            float intensityMultiplier = ComputeAttenuation(context);

            MMCinemachinePositionShakeEvent.Trigger(
                null,
                shakeCurve,
                context.duration,
                finalAmplitude,
                intensityMultiplier
            );
        }

        public override void OnInterrupt(FeedbackContext context)
        {
            MMCinemachinePositionShakeEvent.Trigger(
                null, shakeCurve, 0f, Vector3.zero, 0f,
                stop: true
            );
        }

        /// <summary>
        /// 计算距离衰减系数。
        /// </summary>
        private float ComputeAttenuation(FeedbackContext context)
        {
            if (!useAttenuation || context.owner == null) return 1f;

            Camera mainCamera = Camera.main;
            if (mainCamera == null) return 1f;

            float distance = Vector3.Distance(context.owner.position, mainCamera.transform.position);
            float normalizedDistance = Mathf.Clamp01(distance / attenuationRange);
            return attenuationCurve.Evaluate(normalizedDistance);
        }
    }
}