using System;
using System.Collections.Generic;
using RebootKit.Engine.Main;
using RebootKit.Engine.Network;
using RebootKit.Engine.Simulation;
using Unity.Mathematics;
using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.Rendering.Universal;
using Logger = RebootKit.Engine.Foundation.Logger;

namespace RebootReality.jelycho.Feedbacks {
    struct CameraShakeFeedback {
        public Vector3 center;
        public float radius;
        public float intensity;
        public float timer;

        public static int GetMaxBytes() {
            return sizeof(float) * 3 + sizeof(float) * 3;
        }
    }

    public class FeedbacksManagerActor : Actor {
        static readonly Logger s_Logger = new Logger(nameof(FeedbacksManagerActor));

        [SerializeField] Volume m_Volume;

        [SerializeField] float m_QuickAttackIndicatorDuration = 0.3f;
        [SerializeField] float m_QuickAttackIndicatorPaniniAppearSpeed = 2.0f;
        [SerializeField] float m_QuickAttackIndicatorChromaticAppearSpeed = 2.0f;
        [SerializeField] float m_QuickAttackIndicatorPaniniDisappearSpeed = 2.0f;
        [SerializeField] float m_QuickAttackIndicatorChromaticDisappearSpeed = 2.0f;
        [SerializeField] float m_QuickAttackIndicatorPaniniIntensity = 0.1f;
        [SerializeField] float m_QuickAttackIndicatorChromaticIntensity = 1.0f;

        PaniniProjection m_PaniniProjection;
        ChromaticAberration m_ChromaticAberration;

        bool m_IsChargeReady;
        float m_QuickAttackTimer;

        List<CameraShakeFeedback> m_ActiveCameraShakes = new List<CameraShakeFeedback>();

        void Awake() {
            if (!m_Volume.profile.TryGet(out m_PaniniProjection)) {
                s_Logger.Error($"Failed to find PaniniProjection on volume: {m_Volume.name}");
            }

            if (!m_Volume.profile.TryGet(out m_ChromaticAberration)) {
                s_Logger.Error($"Failed to find ChromaticAberration on volume: {m_Volume.name}");
            }
        }

        //
        // @MARK: Camera shake
        //
        public void ShakeCamera(Vector3 center, float radius, float intensity, float duration) {
            if (!RR.IsServer()) {
                s_Logger.Error("ShakeCamera can only be called on the server.");
                return;
            }

            FeedbacksCameraShakeEvent ev = new FeedbacksCameraShakeEvent {
                Feedback = new CameraShakeFeedback {
                    center = center,
                    radius = radius,
                    intensity = intensity,
                    timer = duration
                }
            };
            SendActorEvent((byte) FeedbacksManagerActorEvents.CameraShake, ref ev);
        }

        public float GetShakeIntensityForPosition(Vector3 position) {
            if (m_ActiveCameraShakes.Count == 0) {
                return 0.0f;
            }

            float intensity = 0.0f;

            foreach (CameraShakeFeedback feedback in m_ActiveCameraShakes) {
                if (feedback.radius <= 0.0f) {
                    continue;
                }

                float distSquared = math.distancesq(feedback.center, position);
                float radiusSquared = feedback.radius * feedback.radius;

                if (distSquared > radiusSquared) {
                    continue;
                }

                float feedbackIntensity = Mathf.Lerp(0.0f,
                                                     feedback.intensity,
                                                     1.0f - (distSquared / radiusSquared));
                intensity = Mathf.Max(feedbackIntensity, intensity);
            }

            return intensity;
        }

        //
        // @MARK: Local only
        //
        public void ShowQuickAttackIndicator() {
            m_QuickAttackTimer = m_QuickAttackIndicatorDuration;
        }

        public void ShowChargeReadyIndicator() {
            m_IsChargeReady = true;
        }

        public void HideChargeReadyIndicator() {
            m_IsChargeReady = false;
        }

        //
        // @MARK: Actor
        //
        protected override IActorData CreateActorData() {
            return new NoActorData();
        }

        public override void OnClientTick(float deltaTime) {
            for (int i = m_ActiveCameraShakes.Count - 1; i >= 0; i--) {
                CameraShakeFeedback feedback = m_ActiveCameraShakes[i];
                feedback.timer -= deltaTime;

                if (feedback.timer <= 0.0f) {
                    m_ActiveCameraShakes.RemoveAt(i);
                    continue;
                }

                m_ActiveCameraShakes[i] = feedback;
            }

            m_QuickAttackTimer -= Time.deltaTime;
            if (m_QuickAttackTimer > 0.0f || m_IsChargeReady) {
                float chromaticIntensity = m_ChromaticAberration.intensity.value;
                chromaticIntensity = Mathf.MoveTowards(chromaticIntensity,
                                                       m_QuickAttackIndicatorChromaticIntensity,
                                                       deltaTime * m_QuickAttackIndicatorChromaticAppearSpeed);
                m_ChromaticAberration.intensity.value = chromaticIntensity;

                float paniniIntensity = m_PaniniProjection.distance.value;
                paniniIntensity = Mathf.MoveTowards(paniniIntensity,
                                                    m_QuickAttackIndicatorPaniniIntensity,
                                                    deltaTime * m_QuickAttackIndicatorPaniniAppearSpeed);
                m_PaniniProjection.distance.value = paniniIntensity;
            } else {
                float chromaticIntensity = m_ChromaticAberration.intensity.value;
                chromaticIntensity = Mathf.MoveTowards(chromaticIntensity,
                                                       0.0f,
                                                       deltaTime * m_QuickAttackIndicatorChromaticDisappearSpeed);
                m_ChromaticAberration.intensity.value = chromaticIntensity;

                float paniniIntensity = m_PaniniProjection.distance.value;
                paniniIntensity = Mathf.MoveTowards(paniniIntensity,
                                                    0.0f,
                                                    deltaTime * m_QuickAttackIndicatorPaniniDisappearSpeed);
                m_PaniniProjection.distance.value = paniniIntensity;
            }
        }

        protected override void OnActorEventClient(ActorEvent actorEvent) {
            FeedbacksManagerActorEvents feedbackEvent = (FeedbacksManagerActorEvents) actorEvent.EventID;

            switch (feedbackEvent) {

            case FeedbacksManagerActorEvents.CameraShake: {
                FeedbacksCameraShakeEvent ev = new FeedbacksCameraShakeEvent();
                DataSerializationUtils.Deserialize(actorEvent.Data, ref ev);

                if (ev.Feedback.timer > 0.0f) {
                    m_ActiveCameraShakes.Add(ev.Feedback);
                }
                break;
            }

            }
        }
    }

    enum FeedbacksManagerActorEvents : byte {
        None = 0x00,
        CameraShake = 0x01,
    }

    struct FeedbacksCameraShakeEvent : IActorData {
        public CameraShakeFeedback Feedback;

        public int GetMaxBytes() {
            return CameraShakeFeedback.GetMaxBytes();
        }

        public void Serialize(NetworkBufferWriter writer) {
            writer.Write(Feedback.center);
            writer.Write(Feedback.radius);
            writer.Write(Feedback.intensity);
            writer.Write(Feedback.timer);
        }

        public void Deserialize(NetworkBufferReader reader) {
            reader.Read(out Feedback.center);
            reader.Read(out Feedback.radius);
            reader.Read(out Feedback.intensity);
            reader.Read(out Feedback.timer);
        }
    }
}