using UnityEngine;
using System.Collections;

namespace Minigames.DivingForPictures
{
    /// <summary>
    /// Handles visual feedback for player damage by making the sprite renderer blink red.
    /// Automatically subscribes to damage events from PlayerCollisionBehavior components.
    /// </summary>
    public class PlayerBlinkBehavior : MonoBehaviour
    {
        [Header("Blink Settings")]
        [Tooltip("Color to blink to when taking damage (typically red for damage indication)")]
        [SerializeField] private Color damageBlinkColor = Color.red;
        
        [Tooltip("How fast to blink between normal and damage colors (seconds between color changes)")]
        [SerializeField] private float blinkRate = 0.15f;
        
        [Tooltip("Alpha value for the damage color (0 = transparent, 1 = opaque)")]
        [Range(0f, 1f)]
        [SerializeField] private float damageColorAlpha = 0.7f;
        
        [Header("References")]
        [Tooltip("The SpriteRenderer to apply blink effects to (auto-assigned if empty)")]
        [SerializeField] private SpriteRenderer targetSpriteRenderer;
        
        private bool _isBlinking;
        private bool _isShowingDamageColor;
        private Coroutine _blinkCoroutine;
        private Color _originalColor; // Missing field declaration
        
        private void Awake()
        {
            // Auto-assign sprite renderer if not set
            if (targetSpriteRenderer == null)
            {
                targetSpriteRenderer = GetComponent<SpriteRenderer>();
                if (targetSpriteRenderer == null)
                {
                    targetSpriteRenderer = GetComponentInChildren<SpriteRenderer>();
                    if (targetSpriteRenderer != null)
                    {
                        Debug.Log($"[PlayerBlinkBehavior] Found SpriteRenderer on child object: {targetSpriteRenderer.gameObject.name}");
                    }
                }
            }
            
            if (targetSpriteRenderer == null)
            {
                Debug.LogError("[PlayerBlinkBehavior] No SpriteRenderer found on this GameObject or its children!");
                return;
            }
            
            // Store original color
            _originalColor = targetSpriteRenderer.color;
            
            // Ensure damage color has the correct alpha
            damageBlinkColor.a = damageColorAlpha;
        }
        
        private void OnEnable()
        {
            // Subscribe to immunity events (renamed from damage events)
            PlayerCollisionBehavior.OnImmunityStarted += StartBlinking;
            PlayerCollisionBehavior.OnImmunityEnded += StopBlinking;
        }
        
        private void OnDisable()
        {
            // Unsubscribe from immunity events
            PlayerCollisionBehavior.OnImmunityStarted -= StartBlinking;
            PlayerCollisionBehavior.OnImmunityEnded -= StopBlinking;
            
            // Stop any ongoing blink effect
            if (_blinkCoroutine != null)
            {
                StopCoroutine(_blinkCoroutine);
                _blinkCoroutine = null;
            }
            
            // Restore original color
            RestoreOriginalColor();
        }
        
        /// <summary>
        /// Starts the red blinking effect when damage begins
        /// </summary>
        private void StartBlinking()
        {
            if (targetSpriteRenderer == null) return;
            
            Debug.Log("[PlayerBlinkBehavior] Starting damage blink effect");
            
            // Stop any existing blink coroutine
            if (_blinkCoroutine != null)
            {
                StopCoroutine(_blinkCoroutine);
            }
            
            _isBlinking = true;
            _isShowingDamageColor = false;
            
            // Start the blink coroutine
            _blinkCoroutine = StartCoroutine(BlinkCoroutine());
        }
        
        /// <summary>
        /// Stops the blinking effect when damage ends
        /// </summary>
        private void StopBlinking()
        {
            Debug.Log("[PlayerBlinkBehavior] Stopping damage blink effect");
            
            _isBlinking = false;
            
            // Stop the blink coroutine
            if (_blinkCoroutine != null)
            {
                StopCoroutine(_blinkCoroutine);
                _blinkCoroutine = null;
            }
            
            // Restore original color
            RestoreOriginalColor();
        }
        
        /// <summary>
        /// Coroutine that handles the blinking animation
        /// </summary>
        private IEnumerator BlinkCoroutine()
        {
            while (_isBlinking && targetSpriteRenderer != null)
            {
                // Toggle between original and damage colors
                if (_isShowingDamageColor)
                {
                    targetSpriteRenderer.color = _originalColor;
                    _isShowingDamageColor = false;
                }
                else
                {
                    targetSpriteRenderer.color = damageBlinkColor;
                    _isShowingDamageColor = true;
                }
                
                // Wait for blink interval
                yield return new WaitForSeconds(blinkRate);
            }
        }
        
        /// <summary>
        /// Restores the sprite renderer to its original color
        /// </summary>
        private void RestoreOriginalColor()
        {
            if (targetSpriteRenderer != null)
            {
                targetSpriteRenderer.color = _originalColor;
                _isShowingDamageColor = false;
            }
        }
        
        /// <summary>
        /// Updates the original color reference (useful if sprite color changes during gameplay)
        /// </summary>
        public void UpdateOriginalColor()
        {
            if (targetSpriteRenderer != null && !_isBlinking)
            {
                _originalColor = targetSpriteRenderer.color;
            }
        }
        
        /// <summary>
        /// Public method to change blink color at runtime
        /// </summary>
        public void SetDamageBlinkColor(Color newColor)
        {
            damageBlinkColor = newColor;
            damageBlinkColor.a = damageColorAlpha;
        }
        
        /// <summary>
        /// Public method to change blink rate at runtime
        /// </summary>
        public void SetBlinkRate(float rate)
        {
            blinkRate = rate;
        }
        
        /// <summary>
        /// Check if currently blinking
        /// </summary>
        public bool IsBlinking => _isBlinking;
        
        /// <summary>
        /// Manually trigger blink effect (useful for testing or other damage sources)
        /// </summary>
        public void TriggerBlink(float duration)
        {
            if (_blinkCoroutine != null)
            {
                StopCoroutine(_blinkCoroutine);
            }
            
            StartCoroutine(ManualBlinkCoroutine(duration));
        }
        
        /// <summary>
        /// Coroutine for manually triggered blink effects
        /// </summary>
        private IEnumerator ManualBlinkCoroutine(float duration)
        {
            _isBlinking = true;
            _isShowingDamageColor = false;
            
            float elapsed = 0f;
            
            while (elapsed < duration && targetSpriteRenderer != null)
            {
                // Toggle between original and damage colors
                if (_isShowingDamageColor)
                {
                    targetSpriteRenderer.color = _originalColor;
                    _isShowingDamageColor = false;
                }
                else
                {
                    targetSpriteRenderer.color = damageBlinkColor;
                    _isShowingDamageColor = true;
                }
                
                yield return new WaitForSeconds(blinkRate);
                elapsed += blinkRate;
            }
            
            // Ensure we end with original color
            RestoreOriginalColor();
            _isBlinking = false;
        }
    }
}