using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;
using Input;

namespace Minigames.DivingForPictures.PictureCamera
{
    /// <summary>
    /// Attached to the viewfinder UI prefab. Handles tap detection and other viewfinder-specific operations.
    /// </summary>
    public class Viewfinder : MonoBehaviour, ITouchInputConsumer
    {
        [SerializeField]
        private Image[] viewfinderImages; // Array of Image components to tint based on proximity
        
        // Events
        public event System.Action OnViewfinderTapped;
        public event System.Action OnViewfinderHoldStarted;
        public event System.Action OnViewfinderHoldEnded;
        
        // State
        private bool isActive = true;
        private RectTransform _rectTransform;
        private CameraViewfinderManager _viewfinderManager;
        
        private void Awake()
        {
            _rectTransform = GetComponent<RectTransform>();
        }
        
        /// <summary>
        /// Initializes the viewfinder with a reference to its manager
        /// </summary>
        /// <param name="manager">Reference to the CameraViewfinderManager</param>
        public void Initialize(CameraViewfinderManager manager)
        {
            _viewfinderManager = manager;
            
            if (_viewfinderManager != null)
            {
                _viewfinderManager.OnProximityUpdated += UpdateProximityColor;
            }
        }
        
        private void OnDisable()
        {
            // Unsubscribe from events when disabled
            if (_viewfinderManager != null)
            {
                _viewfinderManager.OnProximityUpdated -= UpdateProximityColor;
            }
        }
        
        /// <summary>
        /// Updates the color of all viewfinder images based on proximity value
        /// </summary>
        /// <param name="proximity">Proximity value between 0 and 1 (0=far, 1=close)</param>
        private void UpdateProximityColor(float proximity)
        {
            // Lerp between green (close) and red (far)
            Color tintColor = Color.Lerp(Color.red, Color.green, proximity);
            
            // Apply the color to all referenced image components
            if (viewfinderImages != null && viewfinderImages.Length > 0)
            {
                foreach (Image image in viewfinderImages)
                {
                    if (image != null)
                    {
                        image.color = tintColor;
                    }
                }
            }
        }
        
        /// <summary>
        /// Enable or disable input reception
        /// </summary>
        public void SetActive(bool active)
        {
            isActive = active;
        }
        
        #region ITouchInputConsumer Implementation

        public void SetupInputOverride()
        {
            InputManager.Instance.RegisterOverrideConsumer(this);
        }
        
        public void RemoveInputOverride()
        {
            InputManager.Instance.UnregisterOverrideConsumer(this);
        }
        
        public void OnTap(Vector2 position)
        {
            if (isActive)
            {
                // Fire the tap event that PhotoSequenceController will listen to
                OnViewfinderTapped?.Invoke();
                Debug.Log($"[MDPI] Viewfinder OnTap: {position}");
            }
        }
        
        public void OnHoldStart(Vector2 position)
        {
            if (isActive)
            {
                // Fire the hold start event
                OnViewfinderHoldStarted?.Invoke();
                Debug.Log($"[MDPI] Viewfinder OnHoldStart: {position}");
            }
        }
        
        public void OnHoldMove(Vector2 position)
        {
            // We can use this for any continuous effects during hold if needed in the future
        }
        
        public void OnHoldEnd(Vector2 position)
        {
            if (isActive)
            {
                // Fire the hold end event
                OnViewfinderHoldEnded?.Invoke();
                Debug.Log($"[MDPI] Viewfinder OnHoldEnd: {position}");
            }
        }
        
        #endregion
        
        /// <summary>
        /// Check if a point is within the viewfinder's bounds
        /// </summary>
        public bool ContainsPoint(Vector2 screenPoint)
        {
            return RectTransformUtility.RectangleContainsScreenPoint(_rectTransform, screenPoint);
        }
    }
}