using Input;
using Interactions;
using UnityEngine;
using Core;
using Core.Lifecycle;

namespace PuzzleS
{
    /// <summary>
    /// Manages the state and interactions for a single puzzle step, including unlock/lock logic and event handling.
    /// </summary>
    [RequireComponent(typeof(InteractableBase))]
    public class ObjectiveStepBehaviour : ManagedBehaviour, IPuzzlePrompt
    {
        /// <summary>
        /// The data object representing this puzzle step.
        /// </summary>
        public PuzzleStepSO stepData;

        [Header("Indicator Settings")]
        [SerializeField] private GameObject puzzleIndicator;
        [SerializeField] private bool drawPromptRangeGizmo = true;

        private InteractableBase _interactable;
        private bool _isUnlocked = false;
        private bool _isCompleted = false;
        private IPuzzlePrompt _indicator;
        
        // Current proximity state tracked by PuzzleManager
        private ProximityState _currentProximityState = ProximityState.Far;
        
        // Enum for tracking proximity state (simplified to just Close and Far)
        public enum ProximityState { Close, Far }

        internal override void OnManagedAwake()
        {
            _interactable = GetComponent<InteractableBase>();
            
            // Initialize the indicator if it exists, but ensure it's hidden initially
            if (puzzleIndicator != null)
            {
                // The indicator should start inactive until we determine its proper state
                puzzleIndicator.SetActive(false);
                
                // Get the IPuzzlePrompt component
                _indicator = puzzleIndicator.GetComponent<IPuzzlePrompt>();
                
                if (_indicator == null)
                {
                    // Try to find it in children if not on the root
                    _indicator = puzzleIndicator.GetComponentInChildren<IPuzzlePrompt>();
                }
                
                if (_indicator == null)
                {
                    Logging.Warning($"[Puzzles] Indicator prefab for {stepData?.stepId} does not implement IPuzzlePrompt");
                }
            }
        }

        internal override void OnManagedStart()
        {
            // Register with PuzzleManager - safe to access .Instance here
            if (stepData != null && PuzzleManager.Instance != null)
            {
                PuzzleManager.Instance.RegisterStepBehaviour(this);
            }
            else if (stepData == null)
            {
                Logging.Warning($"[Puzzles] Cannot register step on {gameObject.name}: stepData is null");
            }
        }

        void OnEnable()
        {
            if (_interactable == null)
                _interactable = GetComponent<InteractableBase>();
            
            if (_interactable != null)
            {
                _interactable.interactionStarted.AddListener(OnInteractionStarted);
                _interactable.interactionComplete.AddListener(OnInteractionComplete);
            }
        }
        
        internal override void OnManagedDestroy()
        {
            if (PuzzleManager.Instance != null && stepData != null)
            {
                PuzzleManager.Instance.UnregisterStepBehaviour(this);
            }
            
            if (_interactable != null)
            {
                _interactable.interactionStarted.RemoveListener(OnInteractionStarted);
                _interactable.interactionComplete.RemoveListener(OnInteractionComplete);
            }
        }
        
        /// <summary>
        /// Updates the proximity state from PuzzleManager and triggers appropriate methods.
        /// </summary>
        /// <param name="newState">The new proximity state.</param>
        public void UpdateProximityState(ProximityState newState)
        {
            if (_currentProximityState == newState) return;
            if (!_isUnlocked) return; // Don't process state changes if locked
            
            // Determine state changes and call appropriate methods
            if (newState == ProximityState.Close)
            {
                // Transitioning from Far to Close
                ShowClose();
            }
            else // newState == ProximityState.Far
            {
                // Transitioning from Close to Far
                HideClose();
            }
            
            _currentProximityState = newState;
        }

        // IPuzzlePrompt interface implementation - delegates to indicator if available
        
        /// <summary>
        /// Called when the prompt should be initially shown (e.g., when step is unlocked)
        /// </summary>
        public virtual void OnShow()
        {
            if (puzzleIndicator != null)
                puzzleIndicator.SetActive(true);
                
            // Delegate to indicator if available
            if (IsIndicatorValid())
            {
                _indicator.OnShow();
                return;
            }
            
            Logging.Debug($"[Puzzles] Prompt shown for {stepData?.stepId} on {gameObject.name}");
        }
        
        /// <summary>
        /// Called when the prompt should be hidden (e.g., when step is locked)
        /// </summary>
        public virtual void OnHide()
        {
            if (puzzleIndicator != null)
                puzzleIndicator.SetActive(false);
                
            // Delegate to indicator if available
            if (IsIndicatorValid())
            {
                _indicator.OnHide();
            }
            
            Logging.Debug($"[Puzzles] Prompt hidden for {stepData?.stepId} on {gameObject.name}");
        }
        
        /// <summary>
        /// Called when player enters the far range
        /// </summary>
        public virtual void ShowFar()
        {
            // Only show if step is unlocked
            if (!_isUnlocked) return;
            
            // Delegate to indicator if available
            if (IsIndicatorValid())
            {
                _indicator.ShowFar();
                return;
            }
        }
        
        /// <summary>
        /// Called when player enters the close range
        /// </summary>
        public virtual void ShowClose()
        {
            // Only show if step is unlocked
            if (!_isUnlocked) return;
            
            // Delegate to indicator if available
            if (IsIndicatorValid())
            {
                _indicator.ShowClose();
                return;
            }
        }
        
        /// <summary>
        /// Called when player exits the close range
        /// </summary>
        public virtual void HideClose()
        {
            // Only respond if step is unlocked
            if (!_isUnlocked) return;
            
            // Delegate to indicator if available
            if (IsIndicatorValid())
            {
                _indicator.HideClose();
                return;
            }
        }
        
        /// <summary>
        /// Called when player exits the far range
        /// </summary>
        public virtual void HideFar()
        {
            // Only respond if step is unlocked
            if (!_isUnlocked) return;
            
            // Delegate to indicator if available
            if (IsIndicatorValid())
            {
                _indicator.HideFar();
                return;
            }
        }

        /// <summary>
        /// Unlocks this puzzle step, allowing interaction.
        /// </summary>
        public void UnlockStep()
        {
            if (_isUnlocked) return;
            
            _isUnlocked = true;
            Logging.Debug($"[Puzzles] Step unlocked: {stepData?.stepId} on {gameObject.name}");

            // Make the indicator visible since this step is now unlocked
            OnShow();
            
            if (IsIndicatorValid())
            {
                // Set the correct state based on current player distance
                Transform playerTransform = GameObject.FindGameObjectWithTag("Player")?.transform;
                if (playerTransform != null)
                {
                    float distance = Vector3.Distance(transform.position, playerTransform.position);
                    float promptRange = AppleHills.SettingsAccess.GetPuzzlePromptRange();
                    
                    if (distance <= promptRange)
                    {
                        // Player is in close range
                        _currentProximityState = ProximityState.Close;
                        _indicator.ShowClose();
                    }
                    else
                    {
                        // Player is in far range
                        _currentProximityState = ProximityState.Far;
                        _indicator.ShowFar();
                    }
                }
                else
                {
                    // Default to far if player not found
                    _currentProximityState = ProximityState.Far;
                    _indicator.ShowFar();
                }
            }
        }

        /// <summary>
        /// Locks this puzzle step, preventing interaction.
        /// </summary>
        public void LockStep()
        {
            if (!_isUnlocked && puzzleIndicator != null) 
            {
                // Make sure indicator is hidden if we're already locked
                puzzleIndicator.SetActive(false);
                return;
            }
            
            _isUnlocked = false;
            Logging.Debug($"[Puzzles] Step locked: {stepData?.stepId} on {gameObject.name}");

            // Hide the indicator
            OnHide();
        }

        /// <summary>
        /// Returns whether this step is currently unlocked.
        /// </summary>
        public bool IsStepUnlocked()
        {
            return _isUnlocked;
        }

        /// <summary>
        /// Handles the start of an interaction (can be used for visual feedback).
        /// </summary>
        private void OnInteractionStarted(PlayerTouchController playerRef, FollowerController followerRef)
        {
            // Empty - handled by Interactable
        }

        /// <summary>
        /// Handles completion of the interaction, notifies PuzzleManager if successful and unlocked.
        /// </summary>
        /// <param name="success">Whether the interaction was successful.</param>
        private void OnInteractionComplete(bool success)
        {
            if (!_isUnlocked) return;
            if (success && !_isCompleted)
            {
                Logging.Debug($"[Puzzles] Step interacted: {stepData?.stepId} on {gameObject.name}");
                _isCompleted = true;
                PuzzleManager.Instance?.MarkPuzzleStepCompleted(stepData);
                
                if (puzzleIndicator != null)
                {
                    Destroy(puzzleIndicator);
                    _indicator = null;
                }
            }
        }

        private bool IsIndicatorValid()
        {
            return _indicator != null && puzzleIndicator != null && !_isCompleted;
        }
        
        /// <summary>
        /// Visualizes the puzzle prompt ranges in the editor.
        /// </summary>
        private void OnDrawGizmos()
        {
            if (!drawPromptRangeGizmo) return;

            // Use the global puzzle prompt range from settings
            float promptRange = AppleHills.SettingsAccess.GetPuzzlePromptRange();
            
            // Draw threshold circle
            Gizmos.color = Color.cyan;
            Gizmos.DrawWireSphere(transform.position, promptRange);
        }
    }
}