using System.Collections;
using UnityEngine;
using Invector;

namespace Beyond
{
    [CreateAssetMenu(menuName = "Magic/Spells/Projectile (Fireball)")]
    public class ProjectileSpell : SpellDefinition
    {
        [Header("Projectile Settings")]
        public GameObject projectilePrefab;
        public float spawnDelay = 0.2f; 
        public float lifeTime = 10f;
        
        [Header("Spawn Adjustments")]
        [Tooltip("Position relative to Player Root. X=Right, Y=Up, Z=Forward.\nExample: (0, 1.5, 1.0) is Chest Height, 1m forward.")]
        public Vector3 spawnOffset = new Vector3(0f, 1.5f, 1.0f);
        
        [Tooltip("Offset for aiming logic only. Usually slightly higher than the target's pivot.")]
        public float aimHeightOffset = 0.75f;

        public override void Cast(MagicAttacks caster, Transform target)
        {
            caster.StartCoroutine(CastRoutine(caster, target));
        }

        private IEnumerator CastRoutine(MagicAttacks caster, Transform target)
        {
            // 1. Rotate
            yield return caster.RotateTowardsTargetRoutine(target, rotationDuration);

            // 2. Wait
            float remainingDelay = spawnDelay - rotationDuration;
            if (remainingDelay > 0) yield return new WaitForSeconds(remainingDelay);

            // 3. Calculate Spawn Position (Relative to Player)
            // TransformPoint converts local (Offset) to world space based on Player position/rotation
            Vector3 spawnPos = caster.transform.TransformPoint(spawnOffset);

            // 4. Calculate Rotation (Aiming)
            Quaternion spawnRot = caster.transform.rotation; // Default forward

            if (target != null)
            {
                Vector3 targetPos = target.position;
                targetPos.y += aimHeightOffset;
                Vector3 aimDir = (targetPos - spawnPos).normalized;
                
                // Slight arc adjustment
                aimDir.y += 0.1f; 

                if (aimDir.sqrMagnitude > 0.001f)
                    spawnRot = Quaternion.LookRotation(aimDir);
            }

            // 5. Instantiate
            GameObject obj = Instantiate(projectilePrefab, spawnPos, spawnRot);

            // 6. Ignore Collision with Caster (Crucial!)
            Collider projectileCollider = obj.GetComponentInChildren<Collider>();
            Collider playerCollider = caster.GetComponent<Collider>();
            
            if (projectileCollider != null && playerCollider != null)
            {
                Physics.IgnoreCollision(projectileCollider, playerCollider);
            }

            // 7. Register Events & Modifiers
            caster.RegisterSpellDamageEvents(obj, this);
            caster.ApplyDamageModifiers(obj);

            Destroy(obj, lifeTime);
        }
    }
}