using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AI;
using EasyTalk.Display;

namespace MedievalShopkeeper
{
    public enum NPCState
    {
        Entering,
        Browsing,
        Queueing,
        CheckingOut,
        Leaving,
        Fleeing
    }

    public enum NPCIntention
    {
        Shopper,
        Shoplifter,
        Raider
    }

    [RequireComponent(typeof(NavMeshAgent))]
    public class CustomerNPC : Interactable
    {
        [Header("NPC Data")]
        public string npcName = "Peasant";
        public float browseTimePerShelf = 2f;

        [Header("Dialogue (EasyTalk)")]
        [Tooltip("Assign a ConversationDisplay or WorldspaceConversationDisplay attached to this NPC prefab")]
        public ConversationDisplay speechBubble;
        public float bubbleShowDuration = 4f;
        private Coroutine hideBubbleRoutine;

        [Header("Effects")]
        [Tooltip("VFX to play when the NPC is stunned (e.g. caught stealing or kicked out).")]
        [SerializeField] private GameObject stunVFXPrefab;

        private NPCState state;
        public NPCIntention intention { get; private set; }
        private NavMeshAgent agent;
        
        private List<ItemData> basket = new List<ItemData>();
        private List<ItemData> shoppingList = new List<ItemData>();
        
        private ShopTill targetTill;
        private bool isCaught = false;

        private Animator animator;
        private int speedHash;
        private int isMovingHash;
        private int isCarryingHash;
        private float originalSpeed;

        public override string InteractionPrompt 
        {
            get 
            {
                if (intention == NPCIntention.Shoplifter && state == NPCState.Fleeing && basket.Count > 0 && !isCaught)
                {
                    return "Catch Thief!";
                }
                return $"Talk to {npcName}";
            }
        }

        private void Awake()
        {
            agent = GetComponent<NavMeshAgent>();
            if (agent != null) originalSpeed = agent.speed;
            
            animator = GetComponentInChildren<Animator>();
            if (animator != null)
            {
                speedHash = Animator.StringToHash("Speed");
                isMovingHash = Animator.StringToHash("IsMoving");
                isCarryingHash = Animator.StringToHash("IsCarrying");
                
                animator.applyRootMotion = false;
            }
        }

        private void LateUpdate()
        {
            if (speechBubble != null && speechBubble.gameObject.activeInHierarchy && Camera.main != null)
            {
                speechBubble.transform.forward = Camera.main.transform.forward;
            }
        }

        public void PauseMovement()
        {
            if (agent != null && agent.isOnNavMesh)
            {
                agent.isStopped = true;
                agent.velocity = Vector3.zero;
            }
        }

        public void ResumeMovement()
        {
            if (agent != null && agent.isOnNavMesh)
            {
                agent.isStopped = false;
            }
        }

        public void Initialize(NPCIntention newIntention, List<ItemData> newShoppingList)
        {
            intention = newIntention;
            shoppingList = newShoppingList ?? new List<ItemData>();
            
            state = NPCState.Entering;
            
            if (GameManager.Instance != null)
            {
                GameManager.Instance.CustomerEntered();
            }

            if (AudioManager.Instance != null && (intention == NPCIntention.Shoplifter || intention == NPCIntention.Raider))
            {
                AudioManager.Instance.AddThreat();
            }

            if (intention == NPCIntention.Shoplifter) npcName = "Shady " + npcName;
            if (intention == NPCIntention.Raider) npcName = "Angry " + npcName;

            StartCoroutine(BrainRoutine());
        }

        private void OnDestroy()
        {
            if (AudioManager.Instance != null && (intention == NPCIntention.Shoplifter || intention == NPCIntention.Raider))
            {
                AudioManager.Instance.RemoveThreat();
            }
        }

        private IEnumerator BrainRoutine()
        {
            if (ShopDoor.Instance != null)
            {
                agent.SetDestination(ShopDoor.Instance.InteractionTransform.position);
                float timer = 0f;
                while (timer < 10f)
                {
                    if (!agent.pathPending && agent.pathStatus == NavMeshPathStatus.PathComplete && agent.remainingDistance < 1.5f)
                    {
                        break;
                    }
                    if (!agent.isStopped)
                    {
                        timer += Time.deltaTime;
                    }
                    yield return null;
                }
            }

            state = NPCState.Browsing;

            if (intention == NPCIntention.Raider)
            {
                yield return RaiderRoutine();
                yield break;
            }

            List<ItemData> itemsSought = new List<ItemData>(shoppingList);
            if (itemsSought.Count == 0) itemsSought.Add(null); 

            foreach (var desiredItem in itemsSought)
            {
                bool reached = false;
                Shelf targetShelf = null;

                Shelf[] allShelves = FindObjectsByType<Shelf>(FindObjectsInactive.Exclude, FindObjectsSortMode.None);
                List<Shelf> validShelves = new List<Shelf>();
                foreach (var s in allShelves)
                {
                    if (!s.HasStock || s.isBroken) continue;
                    
                    if (desiredItem != null)
                    {
                        if (s.AssignedItem == desiredItem) validShelves.Add(s);
                    }
                    else
                    {
                        validShelves.Add(s);
                    }
                }

                if (validShelves.Count == 0)
                {
                    string logStr = desiredItem != null ? desiredItem.itemName : "anything";
                    Speak($"I can't seem to find any {logStr}...");
                    continue; 
                }
                
                targetShelf = validShelves[Random.Range(0, validShelves.Count)];
                Debug.Log($"[{npcName}] Found {targetShelf.gameObject.name} which has what I need. Heading there...");

                agent.SetDestination(targetShelf.InteractionTransform.position);
                
                float timer = 0f;
                float timeout = 15f; 
                
                while (timer < timeout)
                {
                    if (!agent.pathPending && agent.pathStatus == NavMeshPathStatus.PathComplete)
                    {
                        if (agent.remainingDistance < 1.5f)
                        {
                            reached = true;
                            break;
                        }
                    }
                    
                    if (!agent.isStopped)
                    {
                        timer += Time.deltaTime;
                    }
                    yield return null;
                }

                if (reached)
                {
                    Debug.Log($"[{npcName}] Arrived at {targetShelf.gameObject.name}. Browsing...");
                    yield return new WaitForSeconds(browseTimePerShelf);
                    
                    if (targetShelf.TryTakeItem(out ItemData item))
                    {
                        Debug.Log($"[{npcName}] Took 1x {item.itemName}!");
                        basket.Add(item);
                    }
                }
            }

            if (basket.Count > 0)
            {
                if (intention == NPCIntention.Shoplifter)
                {
                    Debug.LogWarning($"[{npcName}] (Shoplifter) I'm stealing these and running for the door!");
                    LeaveShop();
                }
                else
                {
                    targetTill = FindFirstObjectByType<ShopTill>();
                    if (targetTill != null)
                    {
                        state = NPCState.Queueing;
                        targetTill.JoinQueue(this);
                    }
                    else
                    {
                        Debug.LogWarning($"[{npcName}] No Till found! Dropping items and leaving.");
                        ReturnItemsAndLeave();
                    }
                }
            }
            else
            {
                Speak("I couldn't find what I wanted.");
                ReturnItemsAndLeave();
            }
        }

        private IEnumerator RaiderRoutine()
        {
            Shelf[] allShelves = FindObjectsByType<Shelf>(FindObjectsInactive.Exclude, FindObjectsSortMode.None);
            if (allShelves.Length > 0)
            {
                Shelf targetShelf = allShelves[Random.Range(0, allShelves.Length)];
                Debug.LogWarning($"[{npcName}] (Raider) I'm going to smash {targetShelf.gameObject.name}!");
                
                agent.SetDestination(targetShelf.InteractionTransform.position);
                
                float timer = 0f;
                while (timer < 10f) 
                {
                    if (!agent.pathPending && agent.pathStatus == NavMeshPathStatus.PathComplete && agent.remainingDistance < 1.5f)
                    {
                        yield return new WaitForSeconds(0.5f);
                        targetShelf.BreakShelf();
                        break;
                    }
                    
                    if (!agent.isStopped)
                    {
                        timer += Time.deltaTime;
                    }
                    yield return null;
                }
            }
            
            LeaveShop(); 
        }

        private void Update()
        {
            if (animator != null && agent != null)
            {
                float currentSpeed = agent.velocity.magnitude;
                bool isMoving = agent.velocity.sqrMagnitude > 0.05f && !agent.isStopped && agent.hasPath;
                
                animator.SetFloat(speedHash, currentSpeed);
                animator.SetBool(isMovingHash, isMoving);
                animator.SetBool(isCarryingHash, basket.Count > 0);
            }

            if (agent != null && agent.isStopped) return;

            if (state == NPCState.Queueing && targetTill != null)
            {
                Vector3 qPos = targetTill.GetQueuePosition(this);
                agent.SetDestination(qPos);

                if (targetTill.IsFrontOfQueue(this) && !agent.pathPending && agent.pathStatus == NavMeshPathStatus.PathComplete && agent.remainingDistance < 1.5f)
                {
                    state = NPCState.CheckingOut;
                    targetTill.PlaceItemsOnCounter(this, basket);
                }
            }
        }

        public List<ItemData> GetBasket()
        {
            return basket;
        }

        public void FinishCheckoutAndLeave()
        {
            basket.Clear();
            LeaveShop();
        }

        public void KickOut()
        {
            if (targetTill != null && (state == NPCState.Queueing || state == NPCState.CheckingOut))
            {
                targetTill.LeaveQueue(this);
            }
            
            StartCoroutine(HitAndStunSequence("Fine, I'm leaving!"));
        }

        private void ReturnItemsAndLeave()
        {
            if (ShopInventory.Instance != null)
            {
                foreach (var item in basket)
                {
                    if (item != null) ShopInventory.Instance.AddStock(item, 1);
                }
            }
            basket.Clear();
            LeaveShop();
        }

        private void LeaveShop()
        {
            if (state == NPCState.Leaving || state == NPCState.Fleeing) return;
            
            state = (intention == NPCIntention.Shoplifter || intention == NPCIntention.Raider) ? NPCState.Fleeing : NPCState.Leaving;
            
            StopAllCoroutines();

            if (state == NPCState.Fleeing && agent != null)
            {
                agent.speed *= 1.5f; // Run away faster!
            }

            if (ShopDoor.Instance != null)
            {
                agent.SetDestination(ShopDoor.Instance.InteractionTransform.position);
            }
            
            StartCoroutine(WaitAndDestroy());
        }

        private IEnumerator WaitAndDestroy()
        {
            float timeout = 15f;
            float timer = 0f;

            while (timer < timeout)
            {
                if (!agent.pathPending && agent.pathStatus == NavMeshPathStatus.PathComplete && agent.remainingDistance < 1.5f)
                {
                    break;
                }
                
                if (!agent.isStopped)
                {
                    timer += Time.deltaTime;
                }
                yield return null;
            }
            
            if (GameManager.Instance != null)
            {
                GameManager.Instance.CustomerLeft();
            }

            Destroy(gameObject);
        }

        public override void Interact(PlayerController player)
        {
            base.Interact(player);

            if (intention == NPCIntention.Shoplifter && state == NPCState.Fleeing && basket.Count > 0 && !isCaught)
            {
                CatchThief();
                return;
            }

            if (UIManager.Instance != null)
            {
                UIManager.Instance.OpenNPCMenu(this, player);
            }
        }

        private void CatchThief()
        {
            isCaught = true;
            Debug.Log($"<color=#00FF00>[Caught!] You caught {npcName} trying to steal {basket.Count} items!</color>");
            StartCoroutine(HitAndStunSequence("Alright, alright! You caught me. Here!"));
        }

        private IEnumerator HitAndStunSequence(string dialogText)
        {
            PauseMovement();
            
            PlayerController player = FindAnyObjectByType<PlayerController>();
            if (player != null)
            {
                Vector3 lookPos = player.transform.position;
                lookPos.y = transform.position.y;
                transform.LookAt(lookPos);
                
                Animator playerAnim = player.GetComponentInChildren<Animator>();
                if (playerAnim != null) playerAnim.SetTrigger("Hit");
            }
            
            yield return new WaitForSeconds(0.4f);

            if (animator != null)
            {
                animator.SetTrigger("Stunned");
            }
            
            if (stunVFXPrefab != null)
            {
                Instantiate(stunVFXPrefab, transform.position + Vector3.up * 1.5f, Quaternion.identity);
            }

            Speak(dialogText);

            yield return new WaitForSeconds(1.5f);
            
            ResumeMovement();
            ReturnItemsAndLeave();
        }

        public void TalkTo()
        {
            if (state == NPCState.Browsing)
                Speak("Just browsing, thank you!");
            else if (state == NPCState.Queueing)
                Speak("I am waiting to pay...");
            else if (state == NPCState.Fleeing)
                Speak("You'll never catch me!");
            else
                Speak("Hello shopkeeper!");
        }

        private void Speak(string text)
        {
            Debug.Log($"[{npcName}] '{text}'");
            
            if (speechBubble != null)
            {
                speechBubble.Show();
                speechBubble.SetCharacterName(npcName, npcName);
                speechBubble.SetConversationText(text);

                if (hideBubbleRoutine != null) StopCoroutine(hideBubbleRoutine);
                hideBubbleRoutine = StartCoroutine(HideBubbleAfterDelay(bubbleShowDuration));
            }
        }

        private IEnumerator HideBubbleAfterDelay(float delay)
        {
            yield return new WaitForSeconds(delay);
            if (speechBubble != null && gameObject.activeInHierarchy)
            {
                speechBubble.Hide();
            }
        }
    }
}