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

public class StratosphereEffects : MonoBehaviour
{
    [Header("Літаки")]
    public GameObject planePrefab;
    public int planeCount = 15;
    public float planeOrbitRadius = 8.0f;
    public float planeMinSpeed = 15f;
    public float planeMaxSpeed = 25f;
    public float planeScale = 0.003f;

    [Header("Перламутрові хмари")]
    public Material pearlCloudMaterial;
    public int pearlCloudGroupCount = 10;
    public float pearlCloudRadius = 8.3f;

    [Header("UV промені")]
    public GameObject godRayPrefab;
    public int rayCount = 5;
    public float rayDistance = 12f;
    public Transform sunTransform;

    private List<PlaneData> planes = new List<PlaneData>();
    private List<ParticleSystem> pearlClouds = new List<ParticleSystem>();

    private class PlaneData
    {
        public Transform transform;
        public Vector3 orbitAxis;
        public float orbitSpeed;
        public float orbitAngle;
    }

    void Start()
    {
        SpawnPlanes();
        SpawnPearlClouds();
        SpawnGodRays();
    }

    public void SpawnPlanes()
    {
        if (planePrefab == null) return;

        for (int i = 0; i < planeCount; i++)
        {
            GameObject plane = Instantiate(planePrefab, this.transform);
            plane.name = "Plane_" + i;
            plane.transform.localScale = Vector3.one * planeScale;

            Vector3 axis = Random.onUnitSphere;
            float angle = Random.Range(0f, 360f);

            Vector3 startPos = GetOrbitPosition(axis, angle);
            plane.transform.position = startPos;

            planes.Add(new PlaneData
            {
                transform = plane.transform,
                orbitAxis = axis,
                orbitSpeed = Random.Range(planeMinSpeed, planeMaxSpeed),
                orbitAngle = angle
            });
        }
    }

    public void SpawnPearlClouds()
    {
        for (int i = 0; i < pearlCloudGroupCount; i++)
        {
            Vector3 groupCenter = this.transform.position + Random.onUnitSphere * pearlCloudRadius;

            GameObject obj = new GameObject("PearlCloud_" + i);
            obj.transform.parent = this.transform;
            obj.transform.position = groupCenter;

            ParticleSystem ps = obj.AddComponent<ParticleSystem>();

            var main = ps.main;
            main.loop = false;
            main.playOnAwake = true;
            main.maxParticles = 12;
            main.startLifetime = 999f;
            main.startSpeed = 0f;
            main.startSize = new ParticleSystem.MinMaxCurve(0.4f, 0.9f);
            main.startColor = new ParticleSystem.MinMaxGradient(
                new Color(1f, 0.6f, 0.85f, 0.6f),
                new Color(0.85f, 0.5f, 0.9f, 0.45f)
            );
            main.simulationSpace = ParticleSystemSimulationSpace.Local;

            var emission = ps.emission;
            emission.rateOverTime = 0f;
            emission.SetBursts(new ParticleSystem.Burst[] { new ParticleSystem.Burst(0f, 12) });

            var shape = ps.shape;
            shape.enabled = true;
            shape.shapeType = ParticleSystemShapeType.Sphere;
            shape.radius = 0.5f;
            shape.radiusThickness = 1f;

            var renderer = ps.GetComponent<ParticleSystemRenderer>();
            renderer.renderMode = ParticleSystemRenderMode.Billboard;
            renderer.sortingFudge = -8f;

            if (pearlCloudMaterial != null)
                renderer.material = pearlCloudMaterial;

            ps.Play();
            pearlClouds.Add(ps);
        }
    }

    void SpawnGodRays()
    {
        if (godRayPrefab == null) return;

        for (int i = 0; i < rayCount; i++)
        {
            float spreadX = Random.Range(-2f, 2f);
            float spreadY = Random.Range(-2f, 2f);

            Vector3 spawnPos = this.transform.position
                + new Vector3(0.19f, -0.21f, -0.51f) * rayDistance
                + Vector3.up * spreadY
                + Vector3.right * spreadX;

            GameObject ray = Instantiate(godRayPrefab, this.transform);
            ray.name = "GodRay_" + i;
            ray.transform.position = spawnPos;
            ray.transform.rotation = Quaternion.Euler(90f, 0f, 189f);
            ray.transform.localScale = new Vector3(0.3f, 0.3f, 1f);
        }
    }
    Vector3 GetOrbitPosition(Vector3 axis, float angle)
    {
        Vector3 perpendicular = Vector3.Cross(axis, Vector3.up).normalized;
        if (perpendicular.magnitude < 0.01f)
            perpendicular = Vector3.Cross(axis, Vector3.right).normalized;

        Quaternion rot = Quaternion.AngleAxis(angle, axis);
        return this.transform.position + rot * perpendicular * planeOrbitRadius;
    }

    void Awake()
    {
        enabled = false;
    }

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

        foreach (PlaneData p in planes)
        {
            if (p.transform == null) continue;

            p.orbitAngle += p.orbitSpeed * Time.deltaTime;

            Vector3 newPos = GetOrbitPosition(p.orbitAxis, p.orbitAngle);
            Vector3 direction = (newPos - p.transform.position).normalized;

            p.transform.position = newPos;

            if (direction != Vector3.zero)
                p.transform.rotation = Quaternion.LookRotation(direction, p.transform.position - this.transform.position);
        }

        Quaternion pearlRotation = Quaternion.AngleAxis(2f * Time.deltaTime, Vector3.up);
        foreach (ParticleSystem ps in pearlClouds)
        {
            if (ps == null) continue;
            ps.transform.position = this.transform.position + pearlRotation * (ps.transform.position - this.transform.position);
        }
    }
}