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

public class SaturnThermosphereEffects : MonoBehaviour
{
    [Header("Налаштування")]
    public Material ringRainMaterial;
    public Material solarWindMaterial;
    public float planetRadius = 58f;

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

    private ParticleSystem _ionizationSystem;
    private ParticleSystem _ringRainSystem;

    void Awake()
    {
        enabled = false;
    }

    float WorldRadius()
    {
        return planetRadius * transform.lossyScale.x;
    }

    public void InitState()
    {
        if (_ionizationSystem != null) Destroy(_ionizationSystem.gameObject);
        if (_ringRainSystem != null) Destroy(_ringRainSystem.gameObject);

        _ionizationSystem = null;
        _ringRainSystem = null;

        thermosphereLevel = 1f;
        previousLevel = 1f;

        CreateIonization();
        CreateRingRain();
    }

    void CreateIonization()
    {
        float r = WorldRadius();

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

        _ionizationSystem = obj.AddComponent<ParticleSystem>();

        var main = _ionizationSystem.main;
        main.loop = true;
        main.playOnAwake = true;
        main.maxParticles = 30000;
        main.startLifetime = new ParticleSystem.MinMaxCurve(4f, 9f);
        main.startSpeed = new ParticleSystem.MinMaxCurve(0f, 0f);
        main.startSize = new ParticleSystem.MinMaxCurve(r * 0.02f, r * 0.06f);
        main.startColor = new ParticleSystem.MinMaxGradient(
            new Color(0.5f, 0.8f, 1f, 1f),
            new Color(0.8f, 0.5f, 1f, 0.8f)
        );
        main.simulationSpace = ParticleSystemSimulationSpace.World;
        main.gravityModifier = 0f;

        var emission = _ionizationSystem.emission;
        emission.rateOverTime = 1500f;

        var shape = _ionizationSystem.shape;
        shape.enabled = true;
        shape.shapeType = ParticleSystemShapeType.Sphere;
        shape.radius = r * 1.18f;
        shape.radiusThickness = 0.04f;

        var vel = _ionizationSystem.velocityOverLifetime;
        vel.enabled = true;
        vel.space = ParticleSystemSimulationSpace.World;
        vel.orbitalX = new ParticleSystem.MinMaxCurve(0f);
        vel.orbitalY = new ParticleSystem.MinMaxCurve(2.5f);
        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 = _ionizationSystem.colorOverLifetime;
        colorOverLifetime.enabled = true;
        Gradient gradient = new Gradient();
        gradient.SetKeys(
            new GradientColorKey[] {
                new GradientColorKey(new Color(0.5f, 0.8f, 1f), 0f),
                new GradientColorKey(new Color(0.7f, 0.5f, 1f), 0.5f),
                new GradientColorKey(new Color(1f, 0.3f, 0.8f), 1f)
            },
            new GradientAlphaKey[] {
                new GradientAlphaKey(0f, 0f),
                new GradientAlphaKey(1f, 0.1f),
                new GradientAlphaKey(0.8f, 0.7f),
                new GradientAlphaKey(0f, 1f)
            }
        );
        colorOverLifetime.color = new ParticleSystem.MinMaxGradient(gradient);

        var noise = _ionizationSystem.noise;
        noise.enabled = true;
        noise.strength = 2f;
        noise.frequency = 0.15f;
        noise.scrollSpeed = 0.3f;

        var renderer = _ionizationSystem.GetComponent<ParticleSystemRenderer>();
        renderer.renderMode = ParticleSystemRenderMode.Billboard;
        renderer.sortingFudge = 3f;
        if (solarWindMaterial != null)
            renderer.material = solarWindMaterial;

        _ionizationSystem.Play();
    }

    void CreateRingRain()
    {
        float r = WorldRadius();

        GameObject obj = new GameObject("SaturnRingRain");
        obj.transform.parent = null;
        obj.transform.position = transform.position;
        obj.transform.rotation = Quaternion.Euler(90f, 0f, 0f);

        _ringRainSystem = obj.AddComponent<ParticleSystem>();

        var main = _ringRainSystem.main;
        main.loop = true;
        main.playOnAwake = true;
        main.maxParticles = 30000;
        main.startLifetime = new ParticleSystem.MinMaxCurve(4f, 8f);
        main.startSpeed = new ParticleSystem.MinMaxCurve(r * 0.01f, r * 0.02f);
        main.startSize = new ParticleSystem.MinMaxCurve(r * 0.004f, r * 0.012f);
        main.startColor = new ParticleSystem.MinMaxGradient(
            new Color(0.6f, 0.9f, 1f, 1f),
            new Color(0.4f, 0.7f, 1f, 0.8f)
        );
        main.simulationSpace = ParticleSystemSimulationSpace.World;
        main.gravityModifier = 0f;

        var emission = _ringRainSystem.emission;
        emission.rateOverTime = 2000f;

        var shape = _ringRainSystem.shape;
        shape.enabled = true;
        shape.shapeType = ParticleSystemShapeType.Donut;
        shape.radius = r * 2f;
        shape.donutRadius = r * 0.5f;
        shape.radiusThickness = 1f;
        shape.arc = 360f;

        var vel = _ringRainSystem.velocityOverLifetime;
        vel.enabled = true;
        vel.space = ParticleSystemSimulationSpace.World;
        vel.x = new ParticleSystem.MinMaxCurve(0f);
        vel.y = new ParticleSystem.MinMaxCurve(-(r * 0.015f));
        vel.z = new ParticleSystem.MinMaxCurve(0f);
        vel.orbitalX = new ParticleSystem.MinMaxCurve(0f);
        vel.orbitalY = new ParticleSystem.MinMaxCurve(0f);
        vel.orbitalZ = new ParticleSystem.MinMaxCurve(0f);

        var colorOverLifetime = _ringRainSystem.colorOverLifetime;
        colorOverLifetime.enabled = true;
        Gradient gradient = new Gradient();
        gradient.SetKeys(
            new GradientColorKey[] {
                new GradientColorKey(new Color(0.8f, 0.95f, 1f), 0f),
                new GradientColorKey(new Color(0.5f, 0.8f, 1f), 0.4f),
                new GradientColorKey(new Color(0.3f, 0.6f, 0.9f), 1f)
            },
            new GradientAlphaKey[] {
                new GradientAlphaKey(1f, 0f),
                new GradientAlphaKey(0.8f, 0.5f),
                new GradientAlphaKey(0f, 1f)
            }
        );
        colorOverLifetime.color = new ParticleSystem.MinMaxGradient(gradient);

        var renderer = _ringRainSystem.GetComponent<ParticleSystemRenderer>();
        renderer.renderMode = ParticleSystemRenderMode.Stretch;
        renderer.velocityScale = 0.15f;
        renderer.lengthScale = 4f;
        renderer.sortingFudge = 4f;
        if (ringRainMaterial != null)
            renderer.material = ringRainMaterial;
        else if (solarWindMaterial != null)
            renderer.material = solarWindMaterial;

        _ringRainSystem.Play();
    }

    void UpdateIonization()
    {
        if (_ionizationSystem == null) return;
        var e = _ionizationSystem.emission;

        if (thermosphereLevel <= 0f)
        {
            e.rateOverTime = 0f;
            return;
        }

        float t = Mathf.InverseLerp(1f, 0f, thermosphereLevel);
        e.rateOverTime = Mathf.Lerp(1500f, 4000f, t);
    }

    void UpdateRingRain()
    {
        if (_ringRainSystem == null) return;
        var e = _ringRainSystem.emission;

        if (thermosphereLevel <= 0f)
        {
            e.rateOverTime = 0f;
            return;
        }

        float t = Mathf.InverseLerp(1f, 0f, thermosphereLevel);
        e.rateOverTime = Mathf.Lerp(2000f, 0f, t);
    }

    void Update()
    {
        if (!Application.isPlaying) return;

        if (thermosphereLevel >= 1f && previousLevel < 1f)
            InitState();

        previousLevel = thermosphereLevel;
        UpdateIonization();
        UpdateRingRain();
    }

    public void CleanUp()
    {
        if (_ionizationSystem != null) Destroy(_ionizationSystem.gameObject);
        if (_ringRainSystem != null) Destroy(_ringRainSystem.gameObject);

        _ionizationSystem = null;
        _ringRainSystem = null;

        enabled = false;
    }
}