using UnityEngine;
using System;
using System.Collections;
using Core;

namespace Minigames.DivingForPictures
{
    public class Monster : MonoBehaviour
    {
        [Header("References")]
        [SerializeField] private CircleCollider2D detectionCollider;

        private bool pictureAlreadyTaken = false;
        private bool photoSequenceInProgress = false;
        private UnityEngine.Camera mainCamera;

        // Track if player is in detection range
        private bool playerInDetectionRange = false;
    
        // Events
        public event Action<Monster> OnMonsterDespawned;
        public event Action<Monster> OnPlayerEnterDetectionRange;
        public event Action<Monster> OnPlayerExitDetectionRange;

        // Properties
        public float PictureRadius => detectionCollider != null ? detectionCollider.radius : 0f;
        public bool IsPhotoSequenceInProgress => photoSequenceInProgress;
        public bool IsPlayerInDetectionRange => playerInDetectionRange;
        public bool IsPictureTaken => pictureAlreadyTaken;

        private void Awake()
        {
            Logging.Debug("Monster created: " + gameObject.name);
            
            if (detectionCollider == null)
                detectionCollider = GetComponent<CircleCollider2D>();

            mainCamera = UnityEngine.Camera.main;

            // Start checking if monster is off-screen
            StartCoroutine(CheckIfOffScreen());
        }

        private void OnEnable()
        {
            pictureAlreadyTaken = false;
            photoSequenceInProgress = false;
        }

        private void OnDestroy()
        {
            Logging.Debug("Monster destroyed: " + gameObject.name);
        }
        
        private IEnumerator CheckIfOffScreen()
        {
            WaitForSeconds wait = new WaitForSeconds(0.5f);

            while (true)
            {
                yield return wait;

                if (!IsVisibleToCamera())
                {
                    DespawnMonster();
                    yield break;
                }
            }
        }

        private bool IsVisibleToCamera()
        {
            if (mainCamera == null)
                mainCamera = UnityEngine.Camera.main;

            if (mainCamera == null)
                return false;

            // Get the world position (will account for parent movement)
            Vector3 worldPosition = transform.position;
            Vector3 viewportPoint = mainCamera.WorldToViewportPoint(worldPosition);

            // If z is negative, the object is behind the camera
            if (viewportPoint.z < 0)
                return false;

            // Simple logic:
            // 1. Allow monsters below the screen (new spawns)
            // 2. Despawn monsters only when completely above the top of screen
            // 3. Keep monsters that are on screen

            // Check if the monster is above the top of the screen
            if (viewportPoint.y > 1)
                return false;  // Monster is completely above screen, destroy it

            // Check horizontal bounds (keep moderate buffer so monsters don't disappear at screen edges)
            float bufferSides = 0.2f;
            bool withinHorizontalBounds = viewportPoint.x > -bufferSides && viewportPoint.x < 1 + bufferSides;

            return withinHorizontalBounds;
        }

        private void OnTriggerEnter2D(Collider2D other)
        {
            // Check if it's the player
            if (other.CompareTag("Player") && !pictureAlreadyTaken)
            {
                playerInDetectionRange = true;
                // Fire the event so the game manager can display the viewfinder without pausing
                OnPlayerEnterDetectionRange?.Invoke(this);
            }
        }

        private void OnTriggerExit2D(Collider2D other)
        {
            // Check if it's the player
            if (other.CompareTag("Player"))
            {
                playerInDetectionRange = false;
                // Fire the event so the game manager can hide the viewfinder
                OnPlayerExitDetectionRange?.Invoke(this);
            }
        }

        /// <summary>
        /// Mark this monster as having its photo sequence in progress
        /// </summary>
        public void SetPhotoSequenceInProgress(bool inProgress = true)
        {
            if (pictureAlreadyTaken) return;
            photoSequenceInProgress = inProgress;
        }

        /// <summary>
        /// Notify that a picture has been taken of this monster
        /// This is now called by DivingGameManager instead of handling the logic internally
        /// </summary>
        public void NotifyPictureTaken()
        {
            if (pictureAlreadyTaken) return;

            pictureAlreadyTaken = true;
            photoSequenceInProgress = false;
        }

        /// <summary>
        /// Despawn this monster (can be called externally)
        /// </summary>
        /// <param name="immediate">Whether to despawn immediately or after a delay</param>
        public void Despawn(bool immediate = false)
        {
            if (immediate)
            {
                DespawnMonster();
            }
            else
            {
                // Add small delay before despawning
                StartCoroutine(DelayedDespawn());
            }
        }

        /// <summary>
        /// Coroutine to despawn after a short delay
        /// </summary>
        private IEnumerator DelayedDespawn()
        {
            yield return new WaitForSeconds(1.0f); // 1-second delay before despawn
            DespawnMonster();
        }

        // Public method to despawn this monster
        public void DespawnMonster()
        {
            if (gameObject.activeSelf)
            {
                OnMonsterDespawned?.Invoke(this);
                gameObject.SetActive(false);
                Destroy(gameObject);
            }
        }
 

#if UNITY_EDITOR
        // Update collider radius in editor
        private void OnValidate()
        {
            if (detectionCollider == null)
                detectionCollider = GetComponent<CircleCollider2D>();
        }
#endif

    }
}