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

public class MesosphereEffects : MonoBehaviour
{
    [Header("Астероїди")]
    public GameObject[] asteroidPrefabs;
    public GameObject explosionPrefab;
    public GameObject firePrefab;
    public Material craterMaterial;

    [Header("Налаштування")]
    public float planetRadius = 6.371f;
    public float spawnRadius = 60f;
    public float mesosphereRadius = 10f;
    [Range(0f, 1f)]
    public float mesosphereLevel = 1f;

    [Header("Частота")]
    public float spawnInterval = 3f;
    public Transform earthTransform;

    private float spawnTimer = 0f;
    private List<GameObject> craters = new List<GameObject>();

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

        spawnTimer += Time.deltaTime;
        float adjustedInterval = Mathf.Lerp(0.5f, spawnInterval, mesosphereLevel);

        if (spawnTimer >= adjustedInterval)
        {
            spawnTimer = 0f;
            SpawnAsteroid();
        }
    }

    void Awake()
    {
        enabled = false;
    }

    void SpawnAsteroid()
    {
        if (asteroidPrefabs == null || asteroidPrefabs.Length == 0) return;

        Vector3 direction = Random.onUnitSphere;
        Vector3 spawnPos = transform.position + direction * spawnRadius;
        Vector3 flyDir = -direction;

        GameObject prefab = asteroidPrefabs[Random.Range(0, asteroidPrefabs.Length)];
        GameObject asteroid = Instantiate(prefab, spawnPos, Random.rotation);
        asteroid.transform.localScale = Vector3.one * Random.Range(0.3f, 0.8f);

        StartCoroutine(MoveAsteroid(asteroid, spawnPos, flyDir));
    }

    IEnumerator MoveAsteroid(GameObject asteroid, Vector3 from, Vector3 flyDir)
    {
        float speed = Random.Range(3f, 6f);
        bool passedMesosphere = false;

        while (asteroid != null)
        {
            asteroid.transform.position += flyDir * speed * Time.deltaTime;
            asteroid.transform.Rotate(Vector3.one * 50f * Time.deltaTime);

            float distFromCenter = Vector3.Distance(asteroid.transform.position, transform.position);

            if (!passedMesosphere && distFromCenter <= mesosphereRadius)
            {
                float burnChance = Mathf.Clamp01((mesosphereLevel - 0.3f) / 0.7f);
                if (Random.value < burnChance)
                {
                    if (firePrefab != null)
                    {
                        GameObject burn = Instantiate(firePrefab, asteroid.transform.position, Quaternion.identity);
                        burn.transform.localScale = Vector3.one * 0.2f;
                        Destroy(burn, 3f);
                    }
                    Destroy(asteroid);
                    yield break;
                }
                passedMesosphere = true;
            }

            if (distFromCenter <= planetRadius + 0.3f)
            {
                Vector3 hitPos = transform.position + (-flyDir) * planetRadius;

                if (explosionPrefab != null)
                {
                    GameObject exp = Instantiate(explosionPrefab, hitPos, Quaternion.identity);
                    exp.transform.localScale = Vector3.one * Random.Range(0.3f, 0.6f);
                    Destroy(exp, 4f);
                }

                SpawnCrater(hitPos, -flyDir);
                Destroy(asteroid);
                yield break;
            }

            if (distFromCenter > spawnRadius * 2f)
            {
                Destroy(asteroid);
                yield break;
            }

            yield return null;
        }
    }

    void SpawnCrater(Vector3 pos, Vector3 normal)
    {
        if (craterMaterial == null) return;

        Vector3 center = earthTransform != null ? earthTransform.position : transform.position;
        Vector3 dirFromCenter = (pos - center).normalized;
        Vector3 surfacePos = center + dirFromCenter * planetRadius;

        GameObject crater = GameObject.CreatePrimitive(PrimitiveType.Sphere);
        crater.name = "Crater";
        crater.transform.position = surfacePos;
        crater.transform.rotation = Quaternion.FromToRotation(Vector3.up, dirFromCenter);

        float size = Random.Range(0.2f, 0.6f);
        crater.transform.localScale = new Vector3(size, 0.03f, size);

        Destroy(crater.GetComponent<Collider>());

        Renderer r = crater.GetComponent<Renderer>();
        r.material = craterMaterial;
        r.shadowCastingMode = UnityEngine.Rendering.ShadowCastingMode.Off;

        craters.Add(crater);
    }

    public void SetMesosphereLevel(float level)
    {
        mesosphereLevel = level;
    }
}