using UnityEngine;

namespace BumpCombat.Enemies
{
    public sealed class AttackWarningVisual : MonoBehaviour
    {
        private static Material sharedMaterial;
        private static Sprite circleSprite;
        private SpriteRenderer circle;

        private void Awake()
        {
            circle = gameObject.AddComponent<SpriteRenderer>();
            circle.sharedMaterial = GetSharedMaterial();
            circle.sortingLayerName = "EnemyWarning";
            circle.color = new Color(1f, 1f, 1f, .15f);
            if (circleSprite == null)
                circleSprite = Resources.Load<Sprite>("Enemies/Warning-v3/Necromancer-Warning-Circle");
            circle.sprite = circleSprite;
            circle.enabled = false;
            gameObject.SetActive(false);
        }

        public void Show(EnemyController controller, Vector2 origin,
            Vector2 direction, Vector2 targetPosition)
        {
            if (controller.AttackShape == EnemyAttackShape.TargetCircle)
                ShowTargetCircle(targetPosition, controller.AttackRadius);
            else
                Hide();
        }

        public void SetActivePhase(bool active)
        {
            if (active) Hide();
        }

        public void ShowTargetCircle(Vector2 center, float radius)
        {
            gameObject.SetActive(true);
            // Gameplay range is already scaled; only the captured landing point is shown.
            transform.SetParent(null, true);
            transform.position = center;
            transform.rotation = Quaternion.identity;
            transform.localScale = new Vector3(radius, radius, 1f);
            circle.enabled = true;
        }

        public void Hide()
        {
            transform.localScale = Vector3.one;
            gameObject.SetActive(false);
        }

        public void CollapseAndHide() => Hide();

        private static Material GetSharedMaterial()
        {
            if (sharedMaterial == null)
                sharedMaterial = new Material(Shader.Find("Sprites/Default"))
                {
                    name = "Attack Warning Material",
                };
            return sharedMaterial;
        }
    }
}