using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class NeptuneStratosphereEffects : MonoBehaviour
{
    [Header("Налаштування")]
    public Material fogMaterial;
    public float planetRadius = 58f;

    [Range(0f, 1f)]
    public float stratosphereLevel = 1f;
    public float previousLevel = 1f;

    private ParticleSystem _fogSystem;
    private ParticleSystem _flashSystem;
    private Coroutine _flashCoroutine;

    void Awake() { enabled = false; }

    public void InitState()
    {
        if (_fogSystem != null) Destroy(_fogSystem.gameObject);
        if (_flashSystem != null) Destroy(_flashSystem.gameObject);
        if (_flashCoroutine != null) StopCoroutine(_flashCoroutine);

        _fogSystem = null;
        _flashSystem = null;

        stratosphereLevel = 1f;
        previousLevel = 1f;

        CreateFog();
        CreateFlash();
        _flashCoroutine = StartCoroutine(SpawnFlashes());
    }

    void CreateFog()
    {
        float r = planetRadius * transform.lossyScale.x;

        GameObject obj = new GameObject("NeptuneStratoFog");
        obj.transform.parent = null;
        obj.transform.position = transform.position;

        _fogSystem = obj.AddComponent<ParticleSystem>();
        var main = _fogSystem.main;
        main.loop = true;
        main.playOnAwake = true;
        main.maxParticles = 6000;
        main.startLifetime = new ParticleSystem.MinMaxCurve(8f, 15f);
        main.startSpeed = new ParticleSystem.MinMaxCurve(0f, 0f);
        main.startSize = new ParticleSystem.MinMaxCurve(r * 0.03f, r * 0.08f);
        main.startColor = new ParticleSystem.MinMaxGradient(
            new Color(0.4f, 0.2f, 0.8f, 0.15f),
            new Color(0.3f, 0.1f, 0.6f, 0.08f)
        );
        main.simulationSpace = ParticleSystemSimulationSpace.World;
        main.gravityModifier = 0f;

        var emission = _fogSystem.emission;
        emission.rateOverTime = 120f;

        var shape = _fogSystem.shape;
        shape.enabled = true;
        shape.shapeType = ParticleSystemShapeType.Sphere;
        shape.radius = r * 1.1f;
        shape.radiusThickness = 0.05f;

        var vel = _fogSystem.velocityOverLifetime;
        vel.enabled = true;
        vel.space = ParticleSystemSimulationSpace.World;
        vel.orbitalX = new ParticleSystem.MinMaxCurve(0f);
        vel.orbitalY = new ParticleSystem.MinMaxCurve(0.8f);
        vel.orbitalZ = new ParticleSystem.MinMaxCurve(0f);
        vel.x = new ParticleSystem.MinMaxCurve(0f);
        vel.y = new ParticleSystem.MinMaxCurve(0f);
        vel.z = new ParticleSystem.MinMaxCurve(0f);

        var colorOverLifetime = _fogSystem.colorOverLifetime;
        colorOverLifetime.enabled = true;
        Gradient gradient = new Gradient();
        gradient.SetKeys(
            new GradientColorKey[] {
                new GradientColorKey(new Color(0.4f, 0.2f, 0.8f), 0f),
                new GradientColorKey(new Color(0.3f, 0.1f, 0.6f), 1f)
            },
            new GradientAlphaKey[] {
                new GradientAlphaKey(0f, 0f),
                new GradientAlphaKey(0.15f, 0.2f),
                new GradientAlphaKey(0.08f, 0.8f),
                new GradientAlphaKey(0f, 1f)
            }
        );
        colorOverLifetime.color = new ParticleSystem.MinMaxGradient(gradient);

        var noise = _fogSystem.noise;
        noise.enabled = true;
        noise.strength = 1f;
        noise.frequency = 0.12f;
        noise.scrollSpeed = 0.08f;

        var renderer = _fogSystem.GetComponent<ParticleSystemRenderer>();
        renderer.renderMode = ParticleSystemRenderMode.Billboard;
        renderer.sortingFudge = 2f;
        if (fogMaterial != null) renderer.material = fogMaterial;

        _fogSystem.Play();
    }

    void CreateFlash()
    {
        float r = planetRadius * transform.lossyScale.x;

        GameObject obj = new GameObject("NeptuneFlash");
        obj.transform.parent = null;
        obj.transform.position = transform.position;

        _flashSystem = obj.AddComponent<ParticleSystem>();
        var main = _flashSystem.main;
        main.loop = false;
        main.playOnAwake = false;
        main.maxParticles = 50;
        main.startLifetime = new ParticleSystem.MinMaxCurve(0.1f, 0.3f);
        main.startSpeed = new ParticleSystem.MinMaxCurve(r * 0.005f, r * 0.015f);
        main.startSize = new ParticleSystem.MinMaxCurve(r * 0.01f, r * 0.03f);
        main.startColor = new ParticleSystem.MinMaxGradient(
            new Color(0.6f, 0.4f, 1f, 1f),
            new Color(0.8f, 0.6f, 1f, 0.8f)
        );
        main.simulationSpace = ParticleSystemSimulationSpace.World;

        var shape = _flashSystem.shape;
        shape.enabled = true;
        shape.shapeType = ParticleSystemShapeType.Sphere;
        shape.radius = r * 0.05f;

        var renderer = _flashSystem.GetComponent<ParticleSystemRenderer>();
        renderer.renderMode = ParticleSystemRenderMode.Billboard;
        renderer.sortingFudge = 6f;
        if (fogMaterial != null) renderer.material = fogMaterial;
    }

    IEnumerator SpawnFlashes()
    {
        while (enabled)
        {
            if (stratosphereLevel < 1f)
            {
                float interval = Mathf.Lerp(0.3f, 3f, stratosphereLevel);
                yield return new WaitForSeconds(interval);

                if (_flashSystem != null)
                {
                    float r = planetRadius * transform.lossyScale.x;
                    _flashSystem.transform.position = transform.position + Random.onUnitSphere * r * 1.08f;
                    _flashSystem.Play();

                    GameObject lightObj = new GameObject("NeptuneFlashLight");
                    lightObj.transform.position = _flashSystem.transform.position;
                    Light l = lightObj.AddComponent<Light>();
                    l.type = LightType.Point;
                    l.color = new Color(0.6f, 0.4f, 1f);
                    l.intensity = Mathf.Lerp(20f, 120f, 1f - stratosphereLevel);
                    l.range = r * 2f;
                    Destroy(lightObj, 0.15f);
                }
            }
            else
            {
                yield return new WaitForSeconds(0.5f);
            }
        }
    }

    void UpdateFog()
    {
        if (_fogSystem == null) return;
        var e = _fogSystem.emission;
        if (stratosphereLevel <= 0f) { e.rateOverTime = 0f; return; }
        float t = Mathf.InverseLerp(1f, 0f, stratosphereLevel);
        e.rateOverTime = Mathf.Lerp(120f, 600f, t);
    }

    void Update()
    {
        if (!Application.isPlaying) return;
        if (stratosphereLevel >= 1f && previousLevel < 1f) InitState();
        previousLevel = stratosphereLevel;
        UpdateFog();
    }

    public void CleanUp()
    {
        if (_fogSystem != null) Destroy(_fogSystem.gameObject);
        if (_flashSystem != null) Destroy(_flashSystem.gameObject);
        if (_flashCoroutine != null) StopCoroutine(_flashCoroutine);
        _fogSystem = null;
        _flashSystem = null;
        enabled = false;
    }
}