using System;
using System.Collections.Generic;
using System.Linq;
using Superlazy;
using UnityEngine;

public class EffectView : MonoBehaviour
{
    private static readonly Queue<EffectView> unused = new Queue<EffectView>();
    private static readonly Dictionary<string, EffectView> used = new Dictionary<string, EffectView>();
    private static Transform unusedRoot;

    public static void InitGlobal()
    {
        unusedRoot = new GameObject("UnusedEffectView").transform;
        unusedRoot.gameObject.SetActive(false);
    }

    public static EffectView MakeUnitEffect(UnitView unit, string effectName, SLEntity effectContext)
    {
        var instance = GetEffect(effectName);
        instance.transform.SetParent(unit.Zone.Root, false);

        //// TODO: 추후 개선이 가능할지 모르겠지만 이펙트뷰 레벨에서 유닛을 가져다 쓰는게 맞는지 고민
        //if (effectContext["CellEffect"])
        //{
        //    instance.transform.position = unit.Position.ToEntity().PositionToCell().CellToPosition().ToVector3();
        //}
        //else
        {
            instance.transform.position = unit.Position;
        }

        instance.transform.rotation = unit.Rotation;
        instance.transform.localScale = unit.EffectScale;
        instance.OnStart(effectContext.Override(), unit.Zone, unit);

        instance.gameObject.SetActive(true);
        return instance;
    }

    public static EffectView MakeEffect(IZoneView zone, string effectName, SLEntity effectContext/*, IWorld world*/, Vector3 position, Quaternion rotation, Vector3 scale)
    {
        var instance = GetEffect(effectName);
        instance.transform.SetParent(zone.Root, false);
        instance.transform.SetPositionAndRotation(position, rotation);
        instance.transform.localScale = scale;
        instance.OnStart(effectContext.Override(), zone, null);

        instance.gameObject.SetActive(true);
        return instance;
    }

    private static EffectView GetEffect(string effectName)
    {
        EffectView newEffect;
        if (unused != null && unused.Count != 0)
        {
            newEffect = unused.Dequeue();
        }
        else
        {
            var newObject = new GameObject();
            newObject.SetActive(false);
            newEffect = newObject.AddComponent<EffectView>();
        }

        if (newEffect.baseRoot == null)
        {
            newEffect.baseRoot = SLResources.CreateInstance(effectName, newEffect.gameObject.transform);
            newEffect.Init();
        }
        newEffect.baseRoot.gameObject.SetActive(true);
        newEffect.gameObject.name = effectName;
        return newEffect;
    }

    public static void ClearEffect()
    {
        foreach (var key in used.Keys.ToList())
        {
            used[key].EndEffect(true);
        }

        used.Clear();
    }

    public static void RemoveEffect(string effectID)
    {
        if (used.ContainsKey(effectID))
        {
            used[effectID].EndEffect();
        }
    }

    private SLResourceObject baseRoot;
    private SLEntity context;
    private UnitView unit;
    private Vector3 offset;
    private Vector3 rotationOffset;

    private Animator[] anims;
    private Renderer[] renderers;
    private ParticleSystem[] particles;
    private TrailRenderer[] trails;
    private Transform bindTransform;

    private void Init()
    {
        anims = GetComponentsInChildren<Animator>();
        renderers = GetComponentsInChildren<Renderer>();
        particles = GetComponentsInChildren<ParticleSystem>();
        trails = GetComponentsInChildren<TrailRenderer>();
    }

    public void EndEffect(bool force = false)
    {
        if (gameObject.activeSelf == false)
        {
            SLLog.Error($"Already Destroy Effect {context["EffectID"]}");
            return;
        }

        bindTransform = null;

        if (used.ContainsKey(context["EffectID"]))
        {
            used.Remove(context["EffectID"]);
        }

        if (unusedRoot)
        {
            transform.localScale = Vector3.one;
            baseRoot.Destroy(force);
            baseRoot = null;
            gameObject.SetActive(false);
            unused.Enqueue(this);
            transform.SetParent(unusedRoot);
        }
        else
        {
            Destroy(gameObject);
        }
    }

    private void OnStart(SLEntity context, IZoneView zone, UnitView unit)
    {
        this.context = context.Override();
        this.unit = unit;

        if (this.context["Scale"] != false)
        {
            transform.localScale *= this.context["Scale"];
        }

        if (this.context["ForceY"])
        {
            transform.Translate(0, -transform.localPosition.y + context["ForceY"], 0);
        }

        if (this.context["ForceRotate"])
        {
            transform.localRotation = Quaternion.Euler(this.context["ForceRotate"].ToVector3());
        }

        offset = this.context["Offset"].ToVector3() * transform.localScale.x;

        rotationOffset = this.context["RotationOffset"].ToVector3();

        if (unit != null)
        {
            if (context["Bind"]["Height"])
            {
                enabled = true;

                var bindHeight = unit.Entity[context["Bind"]["Height"]];
                offset += Vector3.up * bindHeight;
            }

            if (context["Bind"]["Part"])
            {
                enabled = true;
                var part = unit.Entity[context["Bind"]["Part"]];
                bindTransform = unit.transform.GetComponentsInChildren<Transform>().FirstOrDefault(t => t.name == part["Transform"]);
                offset += part["Offset"].ToVector3();
                transform.localScale *= part["Scale"];
            }

            if (context["Bind"]["Transform"])
            {
                enabled = true;
                bindTransform = unit.transform.GetComponentsInChildren<Transform>().FirstOrDefault(t => t.name == context["Bind"]["Transform"]);
            }

            if (context["Bind"]["ShadowScale"])
            {
                enabled = true;

                var scaleDelta = unit.Entity["ShadowRadius"] / SLSystem.Data["Default"]["DefaultShadowScale"];
                transform.localScale *= scaleDelta;
            }

            if (bindTransform == null)
            {
                bindTransform = unit.transform.Find("OffsetRoot");
            }

            foreach (var r in renderers)
            {
                r.gameObject.layer = unit.Zone.Layer;
            }

            foreach (var p in particles)
            {
                p.gameObject.layer = unit.Zone.Layer;
            }

            foreach (var t in trails)
            {
                t.gameObject.layer = unit.Zone.Layer;
            }
        }

        transform.Translate(offset, Space.Self);
        transform.Rotate(rotationOffset, Space.Self);

        foreach (var p in particles)
        {
            p.Clear();
        }

        foreach (var t in trails)
        {
            t.Clear();
        }

        if (context["EffectID"] == false)
        {
            context["EffectID"] = context["Effect"];
            var index = 1;
            while (used.ContainsKey(context["EffectID"]))
            {
                context["EffectID"] = context["Effect"].ToString() + index;
                ++index;
            }
        }
        used.Add(context["EffectID"], this);

        //string layer = "Default";
        //if (this.context["Layer"])
        //{
        //    layer = this.context["Layer"];
        //}

        //gameObject.SetLayerRecursively(layer);
    }

    private void Update()
    {
        if (unit != null)
        {
            if (unit.isActiveAndEnabled == false)
            {
                EndEffect();
                return;
            }

            if (context["Bind"]["TopPosition"])
            {
                transform.position = unit.Entity["TopPosition"].ToVector3();
                transform.Translate(offset, Space.Self);
            }

            if (context["Bind"]["Position"])
            {
                transform.position = bindTransform.position;
                transform.Translate(offset, Space.Self);
            }

            if (context["Bind"]["Rotation"])
            {
                transform.rotation = bindTransform.rotation;
                transform.Rotate(rotationOffset, Space.Self);
            }

            if (unit.Entity["ActionSpeed"])
            {
                foreach (var particle in particles)
                {
                    var particleMain = particle.main;
                    particleMain.simulationSpeed = unit.Entity["ActionSpeed"];
                }
            }
        }

        if (context["Duration"])
        {
            context["Duration"] -= Time.deltaTime;
            if (context["Duration"] <= 0)
            {
                EndEffect();
            }

            return;
        }

        if (context["End"])
        {
            EndEffect();
            return;
        }

        if (context["Loop"]) return; // 자연종료 안한다

        foreach (var animator in anims)
        {
            if (animator.GetCurrentAnimatorStateInfo(0).loop || animator.GetCurrentAnimatorStateInfo(0).normalizedTime < 1.0f)
            {
                return;
            }
        }

        foreach (var particle in particles)
        {
            if (particle.isPlaying)
            {
                return;
            }
        }

        EndEffect();
    }

    public static void NoUsePool()
    {
        Destroy(unusedRoot.gameObject);
    }
}