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

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

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

    private ParticleSystem _auroraNorth;
    private ParticleSystem _auroraSouth;
    private ParticleSystem _ionizationSystem;
    private Light _auroraGlowNorth;
    private Light _auroraGlowSouth;

    void Awake() { enabled = false; }

    public void InitState()
    {
        if (_auroraNorth != null) Destroy(_auroraNorth.gameObject);
        if (_auroraSouth != null) Destroy(_auroraSouth.gameObject);
        if (_ionizationSystem != null) Destroy(_ionizationSystem.gameObject);
        if (_auroraGlowNorth != null) Destroy(_auroraGlowNorth.gameObject);
        if (_auroraGlowSouth != null) Destroy(_auroraGlowSouth.gameObject);

        _auroraNorth = null;
        _auroraSouth = null;
        _ionizationSystem = null;
        _auroraGlowNorth = null;
        _auroraGlowSouth = null;

        thermosphereLevel = 1f;
        previousLevel = 1f;

        CreateAurora();
        CreateIonization();
    }

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

        _auroraNorth = CreateAuroraSystem("NeptuneAuroraNorth", r, Vector3.up);
        _auroraSouth = CreateAuroraSystem("NeptuneAuroraSouth", r, Vector3.down);

        GameObject glowN = new GameObject("NeptuneAuroraGlowNorth");
        glowN.transform.position = transform.position + Vector3.up * r * 1.1f;
        _auroraGlowNorth = glowN.AddComponent<Light>();
        _auroraGlowNorth.type = LightType.Point;
        _auroraGlowNorth.color = new Color(0.2f, 0.5f, 1f);
        _auroraGlowNorth.intensity = 80f;
        _auroraGlowNorth.range = r * 5f;

        GameObject glowS = new GameObject("NeptuneAuroraGlowSouth");
        glowS.transform.position = transform.position + Vector3.down * r * 1.1f;
        _auroraGlowSouth = glowS.AddComponent<Light>();
        _auroraGlowSouth.type = LightType.Point;
        _auroraGlowSouth.color = new Color(0.5f, 0.2f, 1f);
        _auroraGlowSouth.intensity = 80f;
        _auroraGlowSouth.range = r * 5f;
    }

    ParticleSystem CreateAuroraSystem(string name, float r, Vector3 poleDir)
    {
        GameObject obj = new GameObject(name);
        obj.transform.parent = null;
        obj.transform.position = transform.position + poleDir * r * 0.85f;
        obj.transform.up = poleDir;

        ParticleSystem ps = obj.AddComponent<ParticleSystem>();
        var main = ps.main;
        main.loop = true;
        main.playOnAwake = true;
        main.maxParticles = 8000;
        main.startLifetime = new ParticleSystem.MinMaxCurve(2f, 5f);
        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(0.1f, 0.4f, 1f, 1f),
            new Color(0.5f, 0.2f, 1f, 0.8f)
        );
        main.simulationSpace = ParticleSystemSimulationSpace.World;
        main.gravityModifier = 0f;

        var emission = ps.emission;
        emission.rateOverTime = 400f;

        var shape = ps.shape;
        shape.enabled = true;
        shape.shapeType = ParticleSystemShapeType.Donut;
        shape.radius = r * 0.35f;
        shape.donutRadius = r * 0.06f;
        shape.radiusThickness = 1f;
        shape.arc = 360f;

        var vel = ps.velocityOverLifetime;
        vel.enabled = true;
        vel.space = ParticleSystemSimulationSpace.Local;
        vel.x = new ParticleSystem.MinMaxCurve(0f);
        vel.y = new ParticleSystem.MinMaxCurve(r * 0.012f);
        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 sizeOverLifetime = ps.sizeOverLifetime;
        sizeOverLifetime.enabled = true;
        AnimationCurve sizeCurve = new AnimationCurve(
            new Keyframe(0f, 0.2f),
            new Keyframe(0.15f, 1f),
            new Keyframe(0.7f, 0.8f),
            new Keyframe(1f, 0f)
        );
        sizeOverLifetime.size = new ParticleSystem.MinMaxCurve(1f, sizeCurve);

        var colorOverLifetime = ps.colorOverLifetime;
        colorOverLifetime.enabled = true;
        Gradient gradient = new Gradient();
        gradient.SetKeys(
            new GradientColorKey[] {
                new GradientColorKey(new Color(0.1f, 0.4f, 1f), 0f),
                new GradientColorKey(new Color(0.3f, 0.7f, 1f), 0.3f),
                new GradientColorKey(new Color(0.6f, 0.2f, 1f), 0.7f),
                new GradientColorKey(new Color(0.2f, 0.5f, 1f), 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 = ps.noise;
        noise.enabled = true;
        noise.strength = 2f;
        noise.frequency = 0.25f;
        noise.scrollSpeed = 0.4f;
        noise.octaveCount = 2;

        var renderer = ps.GetComponent<ParticleSystemRenderer>();
        renderer.renderMode = ParticleSystemRenderMode.Billboard;
        renderer.sortingFudge = 5f;
        if (auroraMaterial != null) renderer.material = auroraMaterial;

        ps.Play();
        return ps;
    }

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

        GameObject obj = new GameObject("NeptuneIonization");
        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 = 6000;
        main.startLifetime = new ParticleSystem.MinMaxCurve(4f, 8f);
        main.startSpeed = new ParticleSystem.MinMaxCurve(0f, 0f);
        main.startSize = new ParticleSystem.MinMaxCurve(r * 0.005f, r * 0.012f);
        main.startColor = new ParticleSystem.MinMaxGradient(
            new Color(0.2f, 0.5f, 1f, 0.8f),
            new Color(0.5f, 0.2f, 0.9f, 0.5f)
        );
        main.simulationSpace = ParticleSystemSimulationSpace.World;
        main.gravityModifier = 0f;

        var emission = _ionizationSystem.emission;
        emission.rateOverTime = 600f;

        var shape = _ionizationSystem.shape;
        shape.enabled = true;
        shape.shapeType = ParticleSystemShapeType.Sphere;
        shape.radius = r * 1.2f;
        shape.radiusThickness = 0.03f;

        var vel = _ionizationSystem.velocityOverLifetime;
        vel.enabled = true;
        vel.space = ParticleSystemSimulationSpace.World;
        vel.orbitalX = new ParticleSystem.MinMaxCurve(0f);
        vel.orbitalY = new ParticleSystem.MinMaxCurve(2f);
        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(0.2f, 0.5f, 1f), 0f),
                new GradientColorKey(new Color(0.5f, 0.2f, 0.9f), 1f)
            },
            new GradientAlphaKey[] {
                new GradientAlphaKey(0f, 0f),
                new GradientAlphaKey(0.8f, 0.1f),
                new GradientAlphaKey(0.5f, 0.7f),
                new GradientAlphaKey(0f, 1f)
            }
        );
        colorOverLifetime.color = new ParticleSystem.MinMaxGradient(gradient);

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

        _ionizationSystem.Play();
    }

    void UpdateAurora()
    {
        float t = Mathf.InverseLerp(1f, 0f, thermosphereLevel);
        if (_auroraNorth != null) { var e = _auroraNorth.emission; e.rateOverTime = thermosphereLevel <= 0f ? 0f : Mathf.Lerp(400f, 0f, t); }
        if (_auroraSouth != null) { var e = _auroraSouth.emission; e.rateOverTime = thermosphereLevel <= 0f ? 0f : Mathf.Lerp(400f, 0f, t); }
        if (_auroraGlowNorth != null) _auroraGlowNorth.intensity = thermosphereLevel <= 0f ? 0f : Mathf.Lerp(80f, 0f, t);
        if (_auroraGlowSouth != null) _auroraGlowSouth.intensity = thermosphereLevel <= 0f ? 0f : Mathf.Lerp(80f, 0f, t);
    }

    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(600f, 3000f, t);
    }

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

    public void CleanUp()
    {
        if (_auroraNorth != null) Destroy(_auroraNorth.gameObject);
        if (_auroraSouth != null) Destroy(_auroraSouth.gameObject);
        if (_ionizationSystem != null) Destroy(_ionizationSystem.gameObject);
        if (_auroraGlowNorth != null) Destroy(_auroraGlowNorth.gameObject);
        if (_auroraGlowSouth != null) Destroy(_auroraGlowSouth.gameObject);
        _auroraNorth = null;
        _auroraSouth = null;
        _ionizationSystem = null;
        _auroraGlowNorth = null;
        _auroraGlowSouth = null;
        enabled = false;
    }
}