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

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

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

    private ParticleSystem _chemicalFogSystem;
    private ParticleSystem _glowSystem;

    void Awake() { enabled = false; }

    public void InitState()
    {
        if (_chemicalFogSystem != null) Destroy(_chemicalFogSystem.gameObject);
        if (_glowSystem != null) Destroy(_glowSystem.gameObject);

        _chemicalFogSystem = null;
        _glowSystem = null;

        stratosphereLevel = 1f;
        previousLevel = 1f;

        CreateChemicalFog();
        CreateGlow();
    }

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

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

        _chemicalFogSystem = obj.AddComponent<ParticleSystem>();
        var main = _chemicalFogSystem.main;
        main.loop = true;
        main.playOnAwake = true;
        main.maxParticles = 8000;
        main.startLifetime = new ParticleSystem.MinMaxCurve(8f, 16f);
        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(0.9f, 0.8f, 0.3f, 0.15f),
            new Color(0.8f, 0.7f, 0.2f, 0.08f)
        );
        main.simulationSpace = ParticleSystemSimulationSpace.World;
        main.gravityModifier = 0f;

        var emission = _chemicalFogSystem.emission;
        emission.rateOverTime = 150f;

        var shape = _chemicalFogSystem.shape;
        shape.enabled = true;
        shape.shapeType = ParticleSystemShapeType.Sphere;
        shape.radius = r * 1.12f;
        shape.radiusThickness = 0.05f;

        var vel = _chemicalFogSystem.velocityOverLifetime;
        vel.enabled = true;
        vel.space = ParticleSystemSimulationSpace.World;
        vel.orbitalX = new ParticleSystem.MinMaxCurve(0f);
        vel.orbitalY = new ParticleSystem.MinMaxCurve(0.3f);
        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 = _chemicalFogSystem.colorOverLifetime;
        colorOverLifetime.enabled = true;
        Gradient gradient = new Gradient();
        gradient.SetKeys(
            new GradientColorKey[] {
                new GradientColorKey(new Color(0.9f, 0.8f, 0.3f), 0f),
                new GradientColorKey(new Color(0.7f, 0.6f, 0.2f), 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 = _chemicalFogSystem.noise;
        noise.enabled = true;
        noise.strength = 0.8f;
        noise.frequency = 0.1f;
        noise.scrollSpeed = 0.05f;

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

        _chemicalFogSystem.Play();
    }

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

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

        _glowSystem = obj.AddComponent<ParticleSystem>();
        var main = _glowSystem.main;
        main.loop = true;
        main.playOnAwake = true;
        main.maxParticles = 4000;
        main.startLifetime = new ParticleSystem.MinMaxCurve(5f, 10f);
        main.startSpeed = new ParticleSystem.MinMaxCurve(0f, 0f);
        main.startSize = new ParticleSystem.MinMaxCurve(r * 0.01f, r * 0.025f);
        main.startColor = new ParticleSystem.MinMaxGradient(
            new Color(1f, 0.9f, 0.4f, 0.4f),
            new Color(0.9f, 0.7f, 0.2f, 0.2f)
        );
        main.simulationSpace = ParticleSystemSimulationSpace.World;
        main.gravityModifier = 0f;

        var emission = _glowSystem.emission;
        emission.rateOverTime = 80f;

        var shape = _glowSystem.shape;
        shape.enabled = true;
        shape.shapeType = ParticleSystemShapeType.Sphere;
        shape.radius = r * 1.1f;
        shape.radiusThickness = 0.03f;

        var vel = _glowSystem.velocityOverLifetime;
        vel.enabled = true;
        vel.space = ParticleSystemSimulationSpace.World;
        vel.orbitalX = new ParticleSystem.MinMaxCurve(0f);
        vel.orbitalY = new ParticleSystem.MinMaxCurve(0.5f);
        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 = _glowSystem.colorOverLifetime;
        colorOverLifetime.enabled = true;
        Gradient gradient = new Gradient();
        gradient.SetKeys(
            new GradientColorKey[] {
                new GradientColorKey(new Color(1f, 0.9f, 0.4f), 0f),
                new GradientColorKey(new Color(0.8f, 0.6f, 0.1f), 1f)
            },
            new GradientAlphaKey[] {
                new GradientAlphaKey(0f, 0f),
                new GradientAlphaKey(0.4f, 0.15f),
                new GradientAlphaKey(0.2f, 0.8f),
                new GradientAlphaKey(0f, 1f)
            }
        );
        colorOverLifetime.color = new ParticleSystem.MinMaxGradient(gradient);

        var renderer = _glowSystem.GetComponent<ParticleSystemRenderer>();
        renderer.renderMode = ParticleSystemRenderMode.Billboard;
        renderer.sortingFudge = 1f;
        if (fogMaterial != null) renderer.material = fogMaterial;

        _glowSystem.Play();
    }

    void UpdateFog()
    {
        if (_chemicalFogSystem == null) return;
        var e = _chemicalFogSystem.emission;
        if (stratosphereLevel <= 0f) { e.rateOverTime = 0f; return; }
        float t = Mathf.InverseLerp(1f, 0f, stratosphereLevel);
        e.rateOverTime = Mathf.Lerp(150f, 500f, t);
    }

    void UpdateGlow()
    {
        if (_glowSystem == null) return;
        var e = _glowSystem.emission;
        if (stratosphereLevel <= 0f) { e.rateOverTime = 0f; return; }
        float t = Mathf.InverseLerp(1f, 0f, stratosphereLevel);
        e.rateOverTime = Mathf.Lerp(80f, 0f, t);
    }

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

    public void CleanUp()
    {
        if (_chemicalFogSystem != null) Destroy(_chemicalFogSystem.gameObject);
        if (_glowSystem != null) Destroy(_glowSystem.gameObject);
        _chemicalFogSystem = null;
        _glowSystem = null;
        enabled = false;
    }
}