using System;
using Core;
using Core.Lifecycle;
using Minigames.FortFight.Fort;
using UnityEngine;

namespace Minigames.FortFight.Projectiles
{
    /// <summary>
    /// Base class for all projectile types in Fort Fight.
    /// Handles physics, collision, and basic damage dealing.
    /// Subclasses override ActivateAbility() and OnHit() for unique behaviors.
    /// </summary>
    [RequireComponent(typeof(Rigidbody2D), typeof(Collider2D))]
    public abstract class ProjectileBase : ManagedBehaviour
    {
        #region Inspector Properties
        
        [Header("Visuals")]
        [Tooltip("Sprite renderer for projectile")]
        [SerializeField] protected SpriteRenderer spriteRenderer;
        
        [Header("Effects")]
        [Tooltip("Particle effect on impact (optional)")]
        [SerializeField] protected GameObject impactEffectPrefab;
        
        #endregion

        #region Events
        
        /// <summary>
        /// Fired when projectile is launched. Parameters: (ProjectileBase projectile)
        /// </summary>
        public event Action<ProjectileBase> OnLaunched;
        
        /// <summary>
        /// Fired when projectile hits something. Parameters: (ProjectileBase projectile, Collider2D hit)
        /// </summary>
        public event Action<ProjectileBase, Collider2D> OnImpact;
        
        /// <summary>
        /// Fired when projectile is destroyed. Parameters: (ProjectileBase projectile)
        /// </summary>
        public event Action<ProjectileBase> OnDestroyed;
        
        #endregion

        #region Properties
        
        public float Damage { get; protected set; }
        public float Mass { get; protected set; }
        public Data.ProjectileType ProjectileType { get; protected set; }
        
        public bool IsLaunched { get; protected set; }
        public bool AbilityActivated { get; protected set; }
        public Vector2 LaunchDirection { get; protected set; }
        public float LaunchForce { get; protected set; }
        
        #endregion
        
        #region Timeout
        
        private const float ProjectileTimeout = 10f; // Destroy projectile after 10 seconds if stuck/off-map
        private Coroutine timeoutCoroutine;
        
        #endregion

        #region Components
        
        protected Rigidbody2D rb2D;
        protected Collider2D projectileCollider;
        
        #endregion

        #region Lifecycle
        
        /// <summary>
        /// Initialize the projectile with its type and load stats from settings.
        /// Must be called after instantiation, before Launch.
        /// </summary>
        public void Initialize(Data.ProjectileType projectileType)
        {
            ProjectileType = projectileType;
            
            // Load damage and mass from settings
            var settings = GameManager.GetSettingsObject<AppleHills.Core.Settings.IFortFightSettings>();
            if (settings != null)
            {
                var config = settings.GetProjectileConfig(projectileType);
                if (config != null)
                {
                    Damage = config.damage;
                    Mass = config.mass;
                    
                    // Update rigidbody mass if already initialized
                    if (rb2D != null)
                    {
                        rb2D.mass = Mass;
                    }
                    
                    Logging.Debug($"[ProjectileBase] Initialized {projectileType} - Damage: {Damage}, Mass: {Mass}");
                }
                else
                {
                    Logging.Warning($"[ProjectileBase] No config found for {projectileType}, using defaults");
                    Damage = 20f;
                    Mass = 1f;
                }
            }
            else
            {
                Logging.Warning($"[ProjectileBase] Settings not found, using default damage and mass");
                Damage = 20f;
                Mass = 1f;
            }
        }
        
        internal override void OnManagedAwake()
        {
            base.OnManagedAwake();
            
            // Automatically assign projectile to correct layer from settings
            var settings = GameManager.GetSettingsObject<AppleHills.Core.Settings.IFortFightSettings>();
            if (settings != null && settings.ProjectileLayer >= 0 && gameObject.layer != settings.ProjectileLayer)
            {
                gameObject.layer = settings.ProjectileLayer;
                Logging.Debug($"[ProjectileBase] Assigned {gameObject.name} to layer {LayerMask.LayerToName(settings.ProjectileLayer)}");
            }
            
            // Cache components
            rb2D = GetComponent<Rigidbody2D>();
            projectileCollider = GetComponent<Collider2D>();
            
            if (spriteRenderer == null)
            {
                spriteRenderer = GetComponent<SpriteRenderer>();
            }
            
            // Configure rigidbody (mass will be set by Initialize if called, otherwise use defaults)
            if (rb2D != null)
            {
                // If Initialize hasn't been called yet, use default mass
                if (Mass == 0f)
                {
                    Mass = 1f;
                    Damage = 20f;
                }
                
                rb2D.mass = Mass;
                rb2D.gravityScale = settings?.ProjectileGravityScale ?? 1f;
                rb2D.collisionDetectionMode = CollisionDetectionMode2D.Continuous;
            }
        }
        
        #endregion

        #region Launch
        
        /// <summary>
        /// Launch the projectile with given direction and force.
        /// Called by SlingshotController.
        /// </summary>
        public virtual void Launch(Vector2 direction, float force)
        {
            if (IsLaunched)
            {
                Logging.Warning($"[ProjectileBase] {gameObject.name} already launched!");
                return;
            }
            
            LaunchDirection = direction.normalized;
            LaunchForce = force;
            IsLaunched = true;
            
            // Apply physics impulse
            if (rb2D != null)
            {
                rb2D.AddForce(LaunchDirection * LaunchForce, ForceMode2D.Impulse);
                
                // Debug: Log actual mass and resulting velocity for trajectory verification
                float actualMass = rb2D.mass;
                float expectedVelocity = LaunchForce / actualMass;
                Logging.Debug($"[Projectile] Launched {gameObject.name} - Force: {LaunchForce:F2}, Mass: {actualMass:F2}, Expected Velocity: {expectedVelocity:F2}, Dir: {LaunchDirection}");
                
                // After physics applies, log actual velocity (next frame would show it, but we log expectation)
                // Note: Actual velocity will be set by Unity physics engine as: velocity = impulse / mass
            }
            
            // Fire event
            OnLaunched?.Invoke(this);
            
            // Start timeout - destroy projectile after configured time if it hasn't been destroyed
            StartTimeoutTimer();
        }
        
        #endregion
        
        #region Timeout
        
        /// <summary>
        /// Start timeout timer. Projectile will auto-destroy after timeout to prevent stuck/lost projectiles.
        /// </summary>
        private void StartTimeoutTimer()
        {
            if (timeoutCoroutine != null)
            {
                StopCoroutine(timeoutCoroutine);
            }
            
            timeoutCoroutine = StartCoroutine(TimeoutCoroutine());
        }
        
        /// <summary>
        /// Timeout coroutine - destroys projectile after configured time
        /// </summary>
        private System.Collections.IEnumerator TimeoutCoroutine()
        {
            yield return new WaitForSeconds(ProjectileTimeout);
            
            // Only destroy if still exists (might have been destroyed by collision already)
            if (this != null && gameObject != null)
            {
                Logging.Debug($"[ProjectileBase] {gameObject.name} timed out after {ProjectileTimeout}s, destroying...");
                DestroyProjectile();
            }
        }
        
        #endregion

        #region Ability
        
        /// <summary>
        /// Activate projectile's special ability (mid-flight).
        /// Override in subclasses for unique behaviors.
        /// Called when player taps screen during flight.
        /// </summary>
        public virtual void ActivateAbility()
        {
            if (!IsLaunched)
            {
                Logging.Warning($"[ProjectileBase] Cannot activate ability - projectile not launched yet!");
                return;
            }
            
            if (AbilityActivated)
            {
                Logging.Warning($"[ProjectileBase] Ability already activated!");
                return;
            }
            
            AbilityActivated = true;
            Logging.Debug($"[ProjectileBase] {gameObject.name} ability activated");
            
            // Subclasses override this for special behavior
        }
        
        #endregion

        #region Collision
        
        private void OnCollisionEnter2D(Collision2D collision)
        {
            if (!IsLaunched) return;
            
            Logging.Debug($"[ProjectileBase] {gameObject.name} hit {collision.gameObject.name}");
            
            // Fire impact event
            OnImpact?.Invoke(this, collision.collider);
            
            // Delegate to subclass - they handle everything (damage, effects, destruction)
            OnHit(collision);
        }
        
        /// <summary>
        /// Called when projectile hits something.
        /// Override in subclasses to implement full projectile behavior.
        /// Default implementation: Deal damage to blocks and destroy projectile.
        /// Subclasses should call DestroyProjectile() when they want to be destroyed.
        /// </summary>
        /// <param name="collision">Collision data including contact points and normals</param>
        protected virtual void OnHit(Collision2D collision)
        {
            // Default behavior: Deal damage to blocks and destroy
            FortBlock block = collision.gameObject.GetComponent<FortBlock>();
            if (block != null)
            {
                block.TakeDamage(Damage);
                Logging.Debug($"[ProjectileBase] Dealt {Damage} damage to {block.gameObject.name}");
            }
            
            // Default: Destroy on hit
            DestroyProjectile();
        }
        
        #endregion

        #region Effects
        
        /// <summary>
        /// Spawn impact particle effect
        /// </summary>
        protected void SpawnImpactEffect(Vector2 position)
        {
            if (impactEffectPrefab != null)
            {
                GameObject effect = Instantiate(impactEffectPrefab, position, Quaternion.identity);
                
                // Dynamically determine cleanup time from particle system
                float lifetime = GetEffectLifetime(effect);
                Destroy(effect, lifetime);
            }
        }
        
        /// <summary>
        /// Get the lifetime of an effect by reading particle system StartLifetime.
        /// Falls back to 2 seconds if no particle system found.
        /// </summary>
        private float GetEffectLifetime(GameObject effect)
        {
            // Try to read from ParticleSystem
            ParticleSystem ps = effect.GetComponent<ParticleSystem>();
            if (ps != null)
            {
                return ps.main.startLifetime.constantMax + 0.5f; // Add small buffer
            }
            
            // Try to read from child particle systems
            ParticleSystem childPs = effect.GetComponentInChildren<ParticleSystem>();
            if (childPs != null)
            {
                return childPs.main.startLifetime.constantMax + 0.5f;
            }
            
            // Fallback for non-particle effects (sprites, etc.)
            return 2f;
        }
        
        #endregion

        #region Destruction
        
        /// <summary>
        /// Destroy the projectile.
        /// Can be overridden by subclasses for delayed destruction.
        /// </summary>
        protected virtual void DestroyProjectile()
        {
            Logging.Debug($"[ProjectileBase] Destroying {gameObject.name}");
            
            // Stop timeout coroutine if running
            if (timeoutCoroutine != null)
            {
                StopCoroutine(timeoutCoroutine);
                timeoutCoroutine = null;
            }
            
            // Fire destroyed event
            OnDestroyed?.Invoke(this);
            
            // Destroy GameObject
            Destroy(gameObject);
        }
        
        #endregion

        #region Debug
        
        private void OnDrawGizmos()
        {
            if (IsLaunched && Application.isPlaying)
            {
                // Draw launch direction
                Gizmos.color = Color.yellow;
                Gizmos.DrawLine(transform.position, transform.position + (Vector3)(LaunchDirection * 2f));
            }
        }
        
        #endregion
    }
}