using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using Core;
using Interactions;
using UnityEngine;
using PuzzleS;

namespace Dialogue
{
    [AddComponentMenu("Apple Hills/Dialogue/Dialogue Component")]
    public class DialogueComponent : MonoBehaviour
    {
        [SerializeField] private RuntimeDialogueGraph dialogueGraph;
        
        private RuntimeDialogueNode currentNode;
        private int currentLineIndex;
        private bool isWaitingForCondition;
        
        // Events
        public event Action<string, string> OnDialogueLineChanged; // speaker name, dialogue text
        public event Action OnDialogueCompleted;
        public event Action<bool> OnConditionStatusChanged; // Whether the condition is now met
        
        // References to managers
        private ItemManager itemManager;
        private PuzzleManager puzzleManager;
        
        // Properties
        public bool IsActive { get; private set; }
        public bool IsCompleted { get; private set; }
        public string CurrentSpeakerName => dialogueGraph?.speakerName;
        
        private void Awake()
        {
            // Auto-injection of managers
            itemManager = FindFirstObjectByType<ItemManager>();
            puzzleManager = FindFirstObjectByType<PuzzleManager>();
            
            if (itemManager == null)
                Debug.LogWarning("DialogueComponent: ItemManager not found in scene!");
            
            if (puzzleManager == null)
                Debug.LogWarning("DialogueComponent: PuzzleManager not found in scene!");
        }
        
        public void StartDialogue()
        {
            if (dialogueGraph == null)
            {
                Debug.LogError("DialogueComponent: No dialogue graph assigned!");
                return;
            }
            
            // Reset state
            IsActive = true;
            IsCompleted = false;
            isWaitingForCondition = false;
            currentLineIndex = 0;
            
            // Set to entry node
            currentNode = dialogueGraph.GetNodeByID(dialogueGraph.entryNodeID);
            
            // Register for events based on current node
            RegisterForEvents();
            
            // Try to process the current node
            ProcessCurrentNode();
        }
        
        public bool CanAdvance()
        {
            // Can't advance if dialogue is not active or is completed
            if (!IsActive || IsCompleted) return false;
            
            // Check if we're waiting for a condition
            if (isWaitingForCondition) return false;
            
            // Check if we have more lines in the current node
            if (currentLineIndex < currentNode.dialogueLines.Count - 1 || 
                (currentNode.loopThroughLines && currentNode.dialogueLines.Count > 0)) 
                return true;
            
            // Check if we have a next node
            return !string.IsNullOrEmpty(currentNode.nextNodeID);
        }
        
        public void Advance()
        {
            if (!CanAdvance()) return;
            
            // If we have more lines in the current node, advance to the next line
            if (currentLineIndex < currentNode.dialogueLines.Count - 1)
            {
                currentLineIndex++;
                OnDialogueLineChanged?.Invoke(CurrentSpeakerName, GetCurrentDialogueLine());
                return;
            }
            
            // If we should loop through lines, reset the index
            if (currentNode.loopThroughLines && currentNode.dialogueLines.Count > 0)
            {
                currentLineIndex = 0;
                OnDialogueLineChanged?.Invoke(CurrentSpeakerName, GetCurrentDialogueLine());
                return;
            }
            
            // Otherwise, move to the next node
            MoveToNextNode();
        }
        
        public void AdvanceToNextNode()
        {
            if (!IsActive || IsCompleted) return;
            
            // Force move to the next node, regardless of current line index
            MoveToNextNode();
        }
        
        public string GetCurrentDialogueLine()
        {
            if (currentNode == null || currentNode.dialogueLines.Count == 0) return string.Empty;
            
            if (currentLineIndex < 0 || currentLineIndex >= currentNode.dialogueLines.Count)
                return string.Empty;
                
            return currentNode.dialogueLines[currentLineIndex];
        }
        
        // Methods to handle dialogue responses for item slots
        public void HandleItemSlotInteraction(string slotID, string itemID, bool isForbiddenItem)
        {
            if (!IsActive || IsCompleted || currentNode == null || 
                currentNode.nodeType != RuntimeDialogueNodeType.WaitOnSlot) 
                return;
            
            // If this is the slot we're waiting for
            if (currentNode.slotItemID == slotID)
            {
                // If correct item is slotted, move to next node
                if (itemID == slotID)
                {
                    MoveToNextNode();
                }
                // If it's a forbidden item, show the forbidden dialogue
                else if (isForbiddenItem && currentNode.forbiddenItemLines.Count > 0)
                {
                    ShowResponseLines(currentNode.forbiddenItemLines, currentNode.loopThroughForbiddenLines);
                }
                // Otherwise show incorrect item dialogue
                else if (currentNode.incorrectItemLines.Count > 0)
                {
                    ShowResponseLines(currentNode.incorrectItemLines, currentNode.loopThroughIncorrectLines);
                }
            }
        }
        
        private void ShowResponseLines(List<string> lines, bool loopThrough)
        {
            StartCoroutine(ShowResponseRoutine(lines, loopThrough));
        }
        
        private IEnumerator ShowResponseRoutine(List<string> lines, bool loopThrough)
        {
            // Store original node and line index
            var originalNode = currentNode;
            var originalLineIndex = currentLineIndex;
            
            // Show each response line
            for (int i = 0; i < lines.Count; i++)
            {
                // Break if dialogue state has changed
                if (currentNode != originalNode || !IsActive || IsCompleted)
                    break;
                    
                OnDialogueLineChanged?.Invoke(CurrentSpeakerName, lines[i]);
                
                // Wait for input to continue
                yield return new WaitForSeconds(2f); // Wait time between lines, can be adjusted
                
                // If we should loop and we're at the end, start over
                if (loopThrough && i == lines.Count - 1)
                    i = -1;
                
                // Break after first iteration if not looping
                if (!loopThrough && i == 0)
                    break;
            }
            
            // Restore original dialogue line
            if (currentNode == originalNode && IsActive && !IsCompleted)
            {
                OnDialogueLineChanged?.Invoke(CurrentSpeakerName, GetCurrentDialogueLine());
            }
        }
        
        private void MoveToNextNode()
        {
            // Unregister from events based on current node
            UnregisterFromEvents();
            
            // If there's no next node, complete the dialogue
            if (string.IsNullOrEmpty(currentNode.nextNodeID))
            {
                IsActive = false;
                IsCompleted = true;
                OnDialogueCompleted?.Invoke();
                return;
            }
            
            // Move to the next node
            currentNode = dialogueGraph.GetNodeByID(currentNode.nextNodeID);
            currentLineIndex = 0;
            
            // Register for events based on new node
            RegisterForEvents();
            
            // Process the new node
            ProcessCurrentNode();
        }
        
        private void ProcessCurrentNode()
        {
            if (currentNode == null)
            {
                Debug.LogError("DialogueComponent: Current node is null!");
                return;
            }
            
            // Handle different node types
            switch (currentNode.nodeType)
            {
                case RuntimeDialogueNodeType.Dialogue:
                    isWaitingForCondition = false;
                    OnDialogueLineChanged?.Invoke(CurrentSpeakerName, GetCurrentDialogueLine());
                    break;
                    
                case RuntimeDialogueNodeType.WaitOnPuzzleStep:
                    HandlePuzzleStepNode();
                    break;
                    
                case RuntimeDialogueNodeType.WaitOnPickup:
                    HandlePickupNode();
                    break;
                    
                case RuntimeDialogueNodeType.WaitOnSlot:
                    HandleSlotNode();
                    break;
                    
                case RuntimeDialogueNodeType.End:
                    IsActive = false;
                    IsCompleted = true;
                    OnDialogueCompleted?.Invoke();
                    break;
                    
                default:
                    Debug.LogError($"DialogueComponent: Unknown node type {currentNode.nodeType}");
                    break;
            }
        }
        
        private void HandlePuzzleStepNode()
        {
            if (puzzleManager == null)
            {
                Debug.LogError("DialogueComponent: PuzzleManager is required for WaitOnPuzzleStep nodes!");
                MoveToNextNode();
                return;
            }
            
            // Check if the puzzle step is already completed
            if (IsPuzzleStepComplete(currentNode.puzzleStepID))
            {
                isWaitingForCondition = false;
                OnDialogueLineChanged?.Invoke(CurrentSpeakerName, GetCurrentDialogueLine());
                return;
            }
            
            // Otherwise, wait for the puzzle step
            isWaitingForCondition = true;
            OnConditionStatusChanged?.Invoke(false);
            OnDialogueLineChanged?.Invoke(CurrentSpeakerName, GetCurrentDialogueLine());
        }
        
        private void HandlePickupNode()
        {
            if (itemManager == null)
            {
                Debug.LogError("DialogueComponent: ItemManager is required for WaitOnPickup nodes!");
                MoveToNextNode();
                return;
            }
            
            // Check if the item is already picked up
            if (IsItemPickedUp(currentNode.pickupItemID))
            {
                isWaitingForCondition = false;
                OnDialogueLineChanged?.Invoke(CurrentSpeakerName, GetCurrentDialogueLine());
                return;
            }
            
            // Otherwise, wait for the item pickup
            isWaitingForCondition = true;
            OnConditionStatusChanged?.Invoke(false);
            OnDialogueLineChanged?.Invoke(CurrentSpeakerName, GetCurrentDialogueLine());
        }
        
        private void HandleSlotNode()
        {
            if (itemManager == null)
            {
                Debug.LogError("DialogueComponent: ItemManager is required for WaitOnSlot nodes!");
                MoveToNextNode();
                return;
            }
            
            // Check if the slot already has the correct item
            if (IsItemSlotted(currentNode.slotItemID))
            {
                isWaitingForCondition = false;
                OnDialogueLineChanged?.Invoke(CurrentSpeakerName, GetCurrentDialogueLine());
                MoveToNextNode();
                return;
            }
            
            // Otherwise, wait for the correct item to be slotted
            isWaitingForCondition = true;
            OnConditionStatusChanged?.Invoke(false);
            OnDialogueLineChanged?.Invoke(CurrentSpeakerName, GetCurrentDialogueLine());
        }
        
        private void RegisterForEvents()
        {
            if (currentNode == null) return;
            
            switch (currentNode.nodeType)
            {
                case RuntimeDialogueNodeType.WaitOnPuzzleStep:
                    if (puzzleManager != null)
                        puzzleManager.OnStepCompleted += OnStepCompleted;
                    break;
                    
                case RuntimeDialogueNodeType.WaitOnPickup:
                    if (itemManager != null)
                        itemManager.OnItemPickedUp += OnItemPickedUp;
                    break;
                    
                case RuntimeDialogueNodeType.WaitOnSlot:
                    if (itemManager != null)
                        itemManager.OnCorrectItemSlotted += OnCorrectItemSlotted;
                    break;
            }
        }
        
        private void UnregisterFromEvents()
        {
            if (currentNode == null) return;
            
            switch (currentNode.nodeType)
            {
                case RuntimeDialogueNodeType.WaitOnPuzzleStep:
                    if (puzzleManager != null)
                        puzzleManager.OnStepCompleted -= OnStepCompleted;
                    break;
                    
                case RuntimeDialogueNodeType.WaitOnPickup:
                    if (itemManager != null)
                        itemManager.OnItemPickedUp -= OnItemPickedUp;
                    break;
                    
                case RuntimeDialogueNodeType.WaitOnSlot:
                    if (itemManager != null)
                        itemManager.OnCorrectItemSlotted -= OnCorrectItemSlotted;
                    break;
            }
        }
        
        // Event handlers for PuzzleManager
        private void OnStepCompleted(PuzzleStepSO step)
        {
            if (!IsActive || !isWaitingForCondition || currentNode.nodeType != RuntimeDialogueNodeType.WaitOnPuzzleStep) 
                return;
                
            if (step.stepId == currentNode.puzzleStepID)
            {
                isWaitingForCondition = false;
                OnConditionStatusChanged?.Invoke(true);
                MoveToNextNode();
            }
        }
        
        // Event handlers for ItemManager
        private void OnItemPickedUp(PickupItemData item)
        {
            if (!IsActive || !isWaitingForCondition || currentNode.nodeType != RuntimeDialogueNodeType.WaitOnPickup) 
                return;
                
            if (item.itemId == currentNode.pickupItemID)
            {
                isWaitingForCondition = false;
                OnConditionStatusChanged?.Invoke(true);
                MoveToNextNode();
            }
        }
        
        private void OnCorrectItemSlotted(PickupItemData slotDefinition, PickupItemData slottedItem)
        {
            if (!IsActive || !isWaitingForCondition || currentNode.nodeType != RuntimeDialogueNodeType.WaitOnSlot) 
                return;
                
            if (slotDefinition.itemId == currentNode.slotItemID)
            {
                isWaitingForCondition = false;
                OnConditionStatusChanged?.Invoke(true);
                MoveToNextNode();
            }
        }
        
        // Helper methods
        private bool IsPuzzleStepComplete(string stepID)
        {
            if (puzzleManager == null) return false;
            
            // Use the public method instead of accessing the private field
            return puzzleManager.IsPuzzleStepCompleted(stepID);
        }
        
        private bool IsItemPickedUp(string itemID)
        {
            if (itemManager == null) return false;
            
            // Check if any picked up item has this ID
            foreach (var pickup in itemManager.Pickups)
            {
                if (pickup.isPickedUp && pickup.itemData != null && pickup.itemData.itemId == itemID)
                {
                    return true;
                }
            }
            return false;
        }
        
        private bool IsItemSlotted(string slotID)
        {
            if (itemManager == null) return false;
            
            // Check if any slot has the correct item with this ID
            foreach (var slot in itemManager.ItemSlots)
            {
                if (slot.CurrentSlottedState == ItemSlotState.Correct &&
                    slot.itemData != null && slot.itemData.itemId == slotID)
                {
                    return true;
                }
            }
            return false;
        }
        
        // Editor functionality
        public void SetDialogueGraph(RuntimeDialogueGraph graph)
        {
            dialogueGraph = graph;
        }
    }
}