using BumpCombat.Player;
using BumpCombat.Core;
using UnityEngine;

namespace BumpCombat.Enemies
{
    /// <summary>
    /// A small gameplay projectile used by the stage ranged enemies. The
    /// projectile owns its travel and lifetime; the enemy owns its warning
    /// and attack timing.
    /// </summary>
    public sealed class EnemyProjectile : MonoBehaviour
    {
        private PlayerHealth target;
        private Vector2 direction;
        private float damage;
        private float speed;
        private float remainingDistance;
        private float hitRadius;
        private bool resolved;

        public EnemyController Owner { get; private set; }

        public static EnemyProjectile Launch(
            EnemyController owner,
            Vector2 origin,
            Vector2 direction,
            float damage,
            float speed,
            float maxDistance,
            float hitRadius,
            bool isBeam)
        {
            GameObject root = new GameObject(
                isBeam ? "Necrofire Beam Projectile" : "Skeleton Archer Arrow");
            root.transform.position = origin;
            root.transform.right = direction.sqrMagnitude > 0.0001f
                ? direction.normalized
                : Vector2.right;
            EnemyProjectile projectile = root.AddComponent<EnemyProjectile>();
            projectile.Owner = owner;
            projectile.direction = root.transform.right;
            projectile.damage = Mathf.Max(0f, damage);
            projectile.speed = Mathf.Max(0f, speed);
            projectile.remainingDistance = Mathf.Max(0.1f, maxDistance);
            projectile.hitRadius = Mathf.Max(0.03f, hitRadius);
            projectile.target = FindAnyObjectByType<PlayerHealth>();
            StageEnemyEffectVisual.AttachProjectile(
                root,
                isBeam,
                isBeam ? 1.2f : 0.6f,
                Mathf.Max(0.04f, projectile.hitRadius * 2f));
            return projectile;
        }

        private void Update()
        {
            if (resolved
                || target == null
                || Owner == null
                || Owner.IsDead
                || !Owner.isActiveAndEnabled)
            {
                Destroy(gameObject);
                return;
            }
            if (!RunManager.GameplayInputEnabled)
            {
                return;
            }
            if (Time.deltaTime <= 0f)
            {
                return;
            }

            float distance = speed * Time.deltaTime;
            Vector2 previousPosition = transform.position;
            if (distance > 0f)
            {
                transform.position += (Vector3)(direction * distance);
                remainingDistance -= distance;
            }

            bool hitTarget = false;
            if (distance > 0f)
            {
                RaycastHit2D[] hits = Physics2D.CircleCastAll(
                    previousPosition,
                    hitRadius,
                    direction,
                    distance,
                    Physics2D.AllLayers);
                for (int i = 0; i < hits.Length; i++)
                {
                    if (hits[i].collider != null
                        && hits[i].collider.GetComponentInParent<PlayerHealth>() == target)
                    {
                        hitTarget = true;
                        break;
                    }
                }
            }
            else
            {
                Collider2D[] overlaps = Physics2D.OverlapCircleAll(
                    transform.position,
                    hitRadius,
                    Physics2D.AllLayers);
                for (int i = 0; i < overlaps.Length; i++)
                {
                    if (overlaps[i] != null
                        && overlaps[i].GetComponentInParent<PlayerHealth>() == target)
                    {
                        hitTarget = true;
                        break;
                    }
                }
            }

            if (hitTarget)
            {
                resolved = true;
                target.TryTakeDamage(
                    damage,
                    ((Vector2)target.transform.position - (Vector2)transform.position).normalized,
                    Owner.PlayerKnockbackDistance);
                Destroy(gameObject);
                return;
            }

            if (remainingDistance <= 0f)
            {
                Destroy(gameObject);
            }
        }

        private void OnDisable()
        {
            resolved = true;
        }
    }
}