using UnityEngine;

/// <summary>
/// Токсичная лужа ядовитой слизи босса, оставшаяся после попадания плевка.
/// Наносит периодический урон игроку при нахождении в зоне поражения и шипит.
/// </summary>
public class AcidPool : MonoBehaviour
{
    public float damagePerSecond = 5f;
    public float lifetime = 4.5f;
    public float radius = 0.85f;

    private float timer = 0f;
    private PlayerHealth playerInPool = null;
    private Light poolLight;
    private System.Collections.Generic.List<Transform> visualSplatterPieces = new System.Collections.Generic.List<Transform>();

    public static AcidPool Create(Vector3 position, float poolLifetime = 4.5f, float poolRadius = 0.85f)
    {
        GameObject go = new GameObject("Acid_Saliva_Splatter");
        go.transform.position = position;

        AcidPool pool = go.AddComponent<AcidPool>();
        pool.lifetime = poolLifetime;
        pool.radius = poolRadius;
        return pool;
    }

    private void Start()
    {
        // Сферический триггер для обнаружения игрока
        SphereCollider sc = gameObject.AddComponent<SphereCollider>();
        sc.isTrigger = true;
        sc.radius = radius;

        // Кислотно-зеленый токсичный материал слюны: влажный, глянцевый
        Material salivaMat = new Material(Shader.Find("Universal Render Pipeline/Lit") ?? Shader.Find("Standard"));
        salivaMat.color = new Color(0.28f, 0.9f, 0.18f, 0.75f);
        salivaMat.EnableKeyword("_EMISSION");
        salivaMat.SetColor("_EmissionColor", new Color(0.15f, 0.7f, 0.1f) * 1.1f);
        if (salivaMat.HasProperty("_Smoothness")) salivaMat.SetFloat("_Smoothness", 0.95f);

        // 1. Центральное влажное пятно слюны (ультратонкое, как реальный след жидкости)
        GameObject mainPuddle = GameObject.CreatePrimitive(PrimitiveType.Cylinder);
        mainPuddle.name = "Saliva_Center";
        mainPuddle.transform.SetParent(transform, false);
        mainPuddle.transform.localPosition = new Vector3(0f, 0.005f, 0f);
        mainPuddle.transform.localScale = new Vector3(radius * 0.9f, 0.002f, radius * 0.9f);
        Destroy(mainPuddle.GetComponent<Collider>());
        mainPuddle.GetComponent<Renderer>().material = salivaMat;
        visualSplatterPieces.Add(mainPuddle.transform);

        // 2. Мелкие органические капли-брызги вокруг центра (клякса превращается в естественный всплеск слюны)
        Vector2[] splashOffsets = new Vector2[]
        {
            new Vector2(0.42f, 0.25f),
            new Vector2(-0.38f, 0.32f),
            new Vector2(0.15f, -0.45f),
            new Vector2(-0.42f, -0.22f),
            new Vector2(0.50f, -0.18f)
        };

        for (int i = 0; i < splashOffsets.Length; i++)
        {
            GameObject splash = GameObject.CreatePrimitive(PrimitiveType.Cylinder);
            splash.name = $"Saliva_Droplet_{i + 1}";
            splash.transform.SetParent(transform, false);
            splash.transform.localPosition = new Vector3(splashOffsets[i].x * radius, 0.005f, splashOffsets[i].y * radius);
            float dropScale = Random.Range(0.14f, 0.24f) * radius;
            splash.transform.localScale = new Vector3(dropScale, 0.002f, dropScale * Random.Range(0.85f, 1.35f));
            Destroy(splash.GetComponent<Collider>());
            splash.GetComponent<Renderer>().material = salivaMat;
            visualSplatterPieces.Add(splash.transform);
        }

        // 3. Мягкий биолюминесцентный свет пятна
        GameObject lightObj = new GameObject("AcidLight");
        lightObj.transform.SetParent(transform, false);
        lightObj.transform.localPosition = new Vector3(0f, 0.15f, 0f);
        poolLight = lightObj.AddComponent<Light>();
        poolLight.type = LightType.Point;
        poolLight.color = new Color(0.3f, 1.0f, 0.2f);
        poolLight.intensity = 0.75f;
        poolLight.range = 1.8f;

        // Звук шипения кислоты
        GameAudioSynthesizer.PlayAcidHiss();
    }

    private void Update()
    {
        timer += Time.deltaTime;

        // Нанесение периодического урона игроку в луже
        if (playerInPool != null)
        {
            playerInPool.TakeDamage(damagePerSecond * Time.deltaTime);
        }

        // Плавное испарение слюны в конце жизни
        float remaining = lifetime - timer;
        if (remaining <= 1.0f)
        {
            float scaleRatio = Mathf.Clamp01(remaining);
            foreach (var piece in visualSplatterPieces)
            {
                if (piece != null)
                {
                    piece.localScale = new Vector3(piece.localScale.x * scaleRatio, 0.002f, piece.localScale.z * scaleRatio);
                }
            }
            if (poolLight != null) poolLight.intensity = 0.75f * scaleRatio;
        }

        if (timer >= lifetime)
        {
            Destroy(gameObject);
        }
    }

    private void OnTriggerEnter(Collider other)
    {
        if (other.CompareTag("Player") || other.GetComponentInParent<PlayerMovement>() != null)
        {
            playerInPool = other.GetComponentInParent<PlayerHealth>();
        }
    }

    private void OnTriggerExit(Collider other)
    {
        if (other.CompareTag("Player") || other.GetComponentInParent<PlayerMovement>() != null)
        {
            if (playerInPool == other.GetComponentInParent<PlayerHealth>())
            {
                playerInPool = null;
            }
        }
    }
}