using System;
using System.Collections.Generic;
using Ichni.RhythmGame.Beatmap;
using UnityEngine;
using Object = UnityEngine.Object;

namespace Ichni.RhythmGame
{
    
    public partial class ParticleEmitter : GameElement, IHaveParticles, IHaveTimeDurationSubmodule, IHaveTransformSubmodule, IHaveColorSubmodule
    {
        #region [暴露属性字段] Essential Configs
        public string themeBundleName;
        public string materialName;

        public bool prewarm;
        public float playTime;
        public float stopTime;

        public ParticleSystemSimulationSpace simulationSpace;
        public float density;
        public float lifeTime;
        public float speed;
        public float radius;

        public bool isAutoOrient;
        public Vector3 particleRotation;
        #endregion

        #region [计算与状态缓存] Calculated & Cached States
        private List<string> themeBundleList;
        private List<string> materialNameList;
        public bool haveBaseColor => true;
        public bool haveEmissionColor => true;
        #endregion

        #region [子模块接口] Submodules
        public ParticleSystem particle { get; set; }
        private IHaveParticles particlesContainer => this;
        public TimeDurationSubmodule timeDurationSubmodule { get; set; }
        public TransformSubmodule transformSubmodule { get; set; }
        public ColorSubmodule colorSubmodule { get; set; }
        #endregion

        #region [生命周期] Lifecycle & Factory
        public static ParticleEmitter GenerateElement(string elementName, Guid id, List<string> tags,
            bool isFirstGenerated, GameElement parentElement, string themeBundleName, string materialName,
            bool prewarm, float playTime, float stopTime, ParticleSystemSimulationSpace simulationSpace,
            float density, float lifeTime, float speed, float radius,
            bool isAutoOrient, Vector3 particleRotation)
        {
            ParticleEmitter particleEmitter = Instantiate(GameManager.Instance.basePrefabs.particleEmitter, parentElement.transform)
                .GetComponent<ParticleEmitter>();
            particleEmitter.particle = particleEmitter.GetComponent<ParticleSystem>();
            particleEmitter.Initialize(elementName, id, tags, isFirstGenerated, parentElement);
            particleEmitter.playTime = playTime;
            particleEmitter.stopTime = stopTime;
            particleEmitter.themeBundleList = ThemeBundleManager.instance.loadedThemeBundleList.ConvertAll(x => x.themeBundleName);
            particleEmitter.materialNameList = new List<string>();
            particleEmitter.themeBundleName = themeBundleName;
            particleEmitter.materialName = materialName;
            particleEmitter.particlesContainer.SetParticleMaterial(themeBundleName, materialName);
            particleEmitter.SetParticleSettings(prewarm, simulationSpace, density, lifeTime, speed, radius, isAutoOrient, particleRotation, false);
            return particleEmitter;
        }

        public void SetParticleSettings(bool prewarm, ParticleSystemSimulationSpace simulationSpace,
            float density, float lifeTime, float speed, float radius, bool isAutoOrient, Vector3 particleRotation, bool mark)
        {
            //这个Mark没有任何作用，只是为了让解释器把interface中的函数和这个函数区分开。否则会Stackoverflow。
            this.prewarm = prewarm;
            this.simulationSpace = simulationSpace;
            this.density = density;
            this.lifeTime = lifeTime;
            this.speed = speed;
            this.radius = radius;
            this.isAutoOrient = isAutoOrient;
            this.particleRotation = particleRotation;
            (this as IHaveParticles).SetParticleSettings(prewarm, simulationSpace, density, lifeTime, speed, radius, isAutoOrient, particleRotation);
        }

        public override void SetDefaultSubmodules()
        {
            timeDurationSubmodule = new TimeDurationSubmodule(this);
            transformSubmodule = new TransformSubmodule(this);
            colorSubmodule = new ColorSubmodule(this, Color.white, true, Color.white, 0);
        }
        #endregion
    }

    #region [轮询更新与交互重写] Main Update & Behavior Overrides
    public partial class ParticleEmitter
    {
        private void Update()
        {
            float songTime = CoreServices.TimeProvider.SongTime;
            if (playTime > songTime || stopTime < songTime)
            {
                particle.Stop();
            }
            else
            {
                if (!particle.isPlaying)
                {
                    particle.Play();
                }
            }
        }

        public override void Refresh()
        {
            base.Refresh();
            ParticleSystemRenderer particleSystemRenderer = particle.GetComponent<ParticleSystemRenderer>();
            particleSystemRenderer.material.SetColor("_BaseColor", colorSubmodule.currentBaseColor);
            if (colorSubmodule.emissionEnabled)
            {
                particleSystemRenderer.material.SetFloat("_EnableEmission", 1);
                particleSystemRenderer.material.SetColor("_EmissionColor", colorSubmodule.GetCurrentEmissionColor());
            }
            else
            {
                particleSystemRenderer.material.SetFloat("_EnableEmission", 0);
            }
        }
    }
    #endregion

    #region [接口能力] Interface
    public interface IHaveParticles
    {
        public ParticleSystem particle { get; set; }

        public virtual void SetParticleMaterial(string themeBundleName, string materialName)
        {
            Material material = ThemeBundleManager.instance.GetObject<Material>(themeBundleName, materialName);
            if (material == null)
            {
                material = ThemeBundleManager.instance.GetObject<Material>("basic", "Basic_Track_Default");
            }

            Renderer particleRenderer = particle.GetComponent<Renderer>();
            particleRenderer.material = Object.Instantiate(material);
            particleRenderer.InitializeShader();
        }

        public virtual void SetParticleSettings(bool prewarm, ParticleSystemSimulationSpace simulationSpace, float density, float lifeTime,
            float speed, float radius, bool isAutoOrient, Vector3 particleRotation)
        {
            SetPrewarm(prewarm);
            SetSimulationSpace(simulationSpace);
            SetDensity(density);
            SetLifeTime(lifeTime);
            SetSpeed(speed);
            SetRadius(radius);
            SetAlignment(isAutoOrient, particleRotation);
        }

        public void SetPrewarm(bool prewarm)
        {
            var mainModule = particle.main;
            mainModule.prewarm = prewarm;
            mainModule.maxParticles = 500;
        }

        public void SetSimulationSpace(ParticleSystemSimulationSpace simulationSpace)
        {
            var mainModule = particle.main;
            mainModule.simulationSpace = simulationSpace;
        }

        public void SetDensity(float density)
        {
            var emission = particle.emission;
            emission.rateOverTime = density;
        }

        public void SetLifeTime(float lifeTime)
        {
            var mainModule = particle.main;
            mainModule.startLifetime = lifeTime;
        }

        public void SetSpeed(float speed)
        {
            var mainModule = particle.main;
            mainModule.startSpeed = speed;
        }

        public void SetRadius(float radius)
        {
            var shapeModule = particle.shape;
            shapeModule.radius = radius;
        }

        public void SetAlignment(bool isAutoOrient, Vector3 particleRotation = default)
        {
            ParticleSystemRenderer particleSystemRenderer = particle.GetComponent<ParticleSystemRenderer>();
            var mainModule = particle.main;
            if (isAutoOrient)
            {
                particleSystemRenderer.alignment = ParticleSystemRenderSpace.View;
                mainModule.startRotation3D = false; // 禁用3D旋转
            }
            else
            {
                particleSystemRenderer.alignment = ParticleSystemRenderSpace.Local;
                mainModule.startRotation3D = true; // 启用3D旋转
                SetParticleRotation(particleRotation);
            }
        }

        public void SetParticleRotation(Vector3 particleRotation)
        {
            Vector3 vector3Rotation = particleRotation * Mathf.Deg2Rad;
            var mainModule = particle.main;
            mainModule.startRotationX = vector3Rotation.x;
            mainModule.startRotationY = vector3Rotation.y;
            mainModule.startRotationZ = vector3Rotation.z;
        }
    }
    #endregion
}