using Core;
using Core.Settings;
using UnityEngine;

namespace Minigames.FortFight.Projectiles
{
    /// <summary>
    /// Vacuum projectile - high mass, slides along ground after landing.
    /// Maintains normal physics until it hits the ground layer, then activates sliding mode.
    /// While sliding, destroys blocks it encounters.
    /// </summary>
    public class VacuumProjectile : ProjectileBase
    {
        private bool isSliding = false;
        private int blocksDestroyed = 0;
        private int maxBlocksToDestroy = 3;
        private Vector2 slideDirection;
        
        protected override void OnHit(Collision2D collision)
        {
            // Get settings once for all checks
            var settings = GameManager.GetSettingsObject<IFortFightSettings>();
            
            // If already sliding, handle block destruction
            if (isSliding)
            {
                var block = collision.gameObject.GetComponent<Fort.FortBlock>();
                if (block != null)
                {
                    // Spawn impact effect on each block hit
                    SpawnImpactEffect(collision.contacts[0].point);
                    
                    // Get damage from settings
                    float blockDamage = settings?.VacuumBlockDamage ?? 999f;
                    
                    // Deal high damage to destroy block instantly
                    block.TakeDamage(blockDamage);
                    blocksDestroyed++;
                    
                    Logging.Debug($"[VacuumProjectile] Destroyed block {blocksDestroyed}/{maxBlocksToDestroy}");
                    
                    if (blocksDestroyed >= maxBlocksToDestroy)
                    {
                        Logging.Debug("[VacuumProjectile] Destroyed max blocks - stopping");
                        DestroyProjectile();
                    }
                }
                // Don't destroy - keep sliding
                return;
            }
            
            // Check if we hit the ground layer to activate sliding
            int groundLayer = settings?.GroundLayer ?? 0;
            
            if (collision.gameObject.layer == groundLayer)
            {
                // Hit ground - start sliding behavior
                SpawnImpactEffect(collision.contacts[0].point);
                Logging.Debug($"[VacuumProjectile] Hit ground (layer {groundLayer}) - starting slide");
                StartSliding();
                // Don't destroy - keep sliding
                return;
            }
            
            // Hit something else (fort block, etc.) while not sliding - use normal projectile behavior
            Logging.Debug($"[VacuumProjectile] Hit {collision.gameObject.name} (layer {collision.gameObject.layer}) - normal impact");
            
            // Deal damage if it's a fort block
            var hitBlock = collision.gameObject.GetComponent<Fort.FortBlock>();
            if (hitBlock != null)
            {
                hitBlock.TakeDamage(Damage);
                SpawnImpactEffect(collision.contacts[0].point);
            }
            
            // Normal projectile destruction
            DestroyProjectile();
        }
        
        /// <summary>
        /// Start sliding behavior after hitting ground surface
        /// </summary>
        private void StartSliding()
        {
            if (isSliding) return;
            
            isSliding = true;
            
            // Get settings
            var settings = GameManager.GetSettingsObject<IFortFightSettings>();
            if (settings != null)
            {
                maxBlocksToDestroy = settings.VacuumDestroyBlockCount;
            }
            
            // Determine slide direction based on horizontal velocity (preserve launch direction)
            if (rb2D != null)
            {
                slideDirection = rb2D.linearVelocity.x >= 0 ? Vector2.right : Vector2.left;
                
                rb2D.gravityScale = 0f;
                rb2D.linearVelocity = Vector2.zero; // Stop all momentum
                
                Logging.Debug($"[VacuumProjectile] Started sliding in direction: {slideDirection}");
            }
        }
        
        private void FixedUpdate()
        {
            if (isSliding && rb2D != null)
            {
                // Set constant velocity in slide direction
                var settings = GameManager.GetSettingsObject<IFortFightSettings>();
                float slideSpeed = settings?.VacuumSlideSpeed ?? 10f;
                
                rb2D.linearVelocity = slideDirection * slideSpeed;
            }
        }
        
        /// <summary>
        /// Clean up when destroyed
        /// </summary>
        protected override void DestroyProjectile()
        {
            isSliding = false;
            base.DestroyProjectile();
        }
    }
}