using UnityEngine;
using UnityEngine.UI;
using BrewMonster.Network;
using PerfectWorld.Scripts.Managers.BrewMonster.Managers;
using PerfectWorld.Scripts.Managers;
using CSNetwork.GPDataType;
using System.Collections.Generic;
using BrewMonster;
using TMPro;

public class pickupItem : MonoBehaviour
{
    // Singleton instance
    private static pickupItem _instance;
    public static pickupItem Instance
    {
        get
        {
            if (_instance == null)
            {
                _instance = FindFirstObjectByType<pickupItem>();
                if (_instance == null)
                {
                    // Create a new GameObject with pickupItem component if none exists
                    GameObject pickupManager = new GameObject("PickupManager");
                    _instance = pickupManager.AddComponent<pickupItem>();
                    DontDestroyOnLoad(pickupManager);
                }
            }
            return _instance;
        }
    }
    
    // Dictionary to store created cubes with their matter IDs
    private Dictionary<int, GameObject> matterCubes = new Dictionary<int, GameObject>();
    
    // Dictionary to track pending pickups by TID
    private Dictionary<int, int> pendingPickups = new Dictionary<int, int>(); // TID -> MatterID
    
    // Set to track items that have been picked up by the player (to prevent respawn)
    private HashSet<int> pickedUpItems = new HashSet<int>(); // MID of picked up items
    
    // Reference to the matter manager
    private EC_ManMatter matterManager;

    // Start is called once before the first execution of Update after the MonoBehaviour is created
    void Start()
    {
        // Ensure this is the singleton instance
        if (_instance == null)
        {
            _instance = this;
            DontDestroyOnLoad(gameObject);
        }
        else if (_instance != this)
        {
            // If another instance already exists, destroy this one
            Destroy(gameObject);
            return;
        }
        
        // Get reference to matter manager
        if (EC_ManMessageMono.Instance != null)
        {
            matterManager = EC_ManMessageMono.Instance.GetECManMatter;
        }
        else
        {
            Debug.LogError("EC_ManMessageMono.Instance is null - matter manager not available");
        }
        
        // Subscribe to matter enter world events
        SubscribeToMatterEvents();
    }

    // Update is called once per frame
    void Update()
    {
        // Check for mouse clicks on cubes
        if (Input.GetMouseButtonDown(0))
        {
            HandleCubeClick();
        }
    }
    
    private void SubscribeToMatterEvents()
    {
        // We'll need to hook into the matter manager's events
        // For now, we'll check for new matters in Update
    }
    
    private void HandleCubeClick()
    {
        // Find the main camera
        Camera mainCamera = Camera.main;
        if (mainCamera == null)
        {
            mainCamera = FindFirstObjectByType<Camera>();
        }
        
        if (mainCamera == null)
        {
            Debug.LogWarning("No camera found for raycast");
            return;
        }
        
        Ray ray = mainCamera.ScreenPointToRay(Input.mousePosition);
        RaycastHit hit;
        
        if (Physics.Raycast(ray, out hit))
        {
            GameObject clickedObject = hit.collider.gameObject;
            
            // Check if the clicked object is one of our matter cubes
            foreach (var kvp in matterCubes)
            {
                if (kvp.Value == clickedObject)
                {
                    int matterId = kvp.Key;
                    SendPickupCommand(matterId);
                    break;
                }
            }
        }
    }
    
    public void SendPickupCommand(int matterId)
    {
        if (matterManager != null)
        {
            var matterData = matterManager.GetMatterData(matterId);
            if (matterData.HasValue)
            {
                // Track this pickup request
                pendingPickups[matterData.Value.tid] = matterId;
                
                UnityGameSession.RequestPickupItem(matterData.Value.mid, matterData.Value.tid);
                Debug.Log($"Pickup request sent for matter - MID: {matterData.Value.mid}, TID: {matterData.Value.tid}");
            }
            else
            {
                Debug.LogWarning($"No matter data found for matter ID: {matterId}");
            }
        }
        else
        {
            Debug.LogError("Matter manager is null - cannot send pickup command");
        }
    }
    
    public void CreateMatterCube(int matterId)
    {
        if (matterManager == null) return;
        
        var matterData = matterManager.GetMatterData(matterId);
        if (!matterData.HasValue) return;
        
        // Check if this item was previously picked up by the player
        if (pickedUpItems.Contains(matterId))
        {
            Debug.Log($"Skipping cube creation for matter {matterId} - item was previously picked up by player");
            return;
        }
        
        // Check if cube already exists
        if (matterCubes.ContainsKey(matterId))
        {
            Debug.Log($"Cube for matter {matterId} already exists");
            return;
        }
        
        // Create cube GameObject
        GameObject cube = GameObject.CreatePrimitive(PrimitiveType.Cube);
        cube.name = $"Matter_{matterData.Value.mid}_TID_{matterData.Value.tid}";
        cube.transform.localScale = new Vector3(1f, 1f, 1f);
        // Position the cube based on matter position
        Vector3 position = new Vector3(
            matterData.Value.pos.x, 
            matterData.Value.pos.y, 
            matterData.Value.pos.z
        );
        cube.transform.position = position;
        
        // Add a collider if it doesn't have one
        if (cube.GetComponent<Collider>() == null)
        {
            cube.AddComponent<BoxCollider>();
        }
        
        // Create text object to display item name above the cube
        CreateItemNameText(cube, matterData.Value.tid);
        
        // Add a script to handle click events
        MatterCubeClickHandler clickHandler = cube.AddComponent<MatterCubeClickHandler>();
        clickHandler.Initialize(matterId, this);
        
        // Store reference to the cube
        matterCubes[matterId] = cube;
        
        Debug.Log($"Created cube for matter {matterId} at position {position}");
    }
    
    private void CreateItemNameText(GameObject cube, int tid)
    {
        // Create a child GameObject for the text
        GameObject textObject = new GameObject("ItemNameText");
        textObject.transform.SetParent(cube.transform);
        
        // Position the text above the cube
        textObject.transform.localPosition = new Vector3(0, 1.2f, 0); // Above the cube
        
        // Add TextMeshPro component
        TextMeshPro textMesh = textObject.AddComponent<TextMeshPro>();
        
        // Get the item name
        string itemName = EC_IvtrItem.ResolveItemName(tid);
        if (string.IsNullOrEmpty(itemName))
        {
            itemName = $"Item {tid}";
        }
        
        // Configure the text
        textMesh.text = itemName;
        textMesh.fontSize = 10f;
        textMesh.color = Color.white;
        textMesh.alignment = TextAlignmentOptions.Center;
        
        // Make the text face the camera
        textObject.AddComponent<Billboard>();
        
        // Add a background for better visibility
        GameObject background = new GameObject("TextBackground");
        background.transform.SetParent(textObject.transform);
        background.transform.localPosition = Vector3.zero;
        background.transform.localScale = new Vector3(2f, 0.8f, 0.1f);
        
        // Add a simple quad renderer for background
        MeshRenderer bgRenderer = background.AddComponent<MeshRenderer>();
        MeshFilter bgFilter = background.AddComponent<MeshFilter>();
        
        // Create a simple quad mesh for the background
        Mesh quadMesh = new Mesh();
        quadMesh.vertices = new Vector3[]
        {
            new Vector3(-0.5f, -0.5f, 0),
            new Vector3(0.5f, -0.5f, 0),
            new Vector3(0.5f, 0.5f, 0),
            new Vector3(-0.5f, 0.5f, 0)
        };
        quadMesh.triangles = new int[] { 0, 1, 2, 0, 2, 3 };
        quadMesh.uv = new Vector2[]
        {
            new Vector2(0, 0),
            new Vector2(1, 0),
            new Vector2(1, 1),
            new Vector2(0, 1)
        };
        quadMesh.RecalculateNormals();
        
        bgFilter.mesh = quadMesh;
        
        // Create a simple material for the background
        Material bgMaterial = new Material(Shader.Find("Standard"));
        bgMaterial.color = new Color(0, 0, 0, 0.7f); // Semi-transparent black
        bgRenderer.material = bgMaterial;
        
        Debug.Log($"Created item name text for TID {tid}: {itemName}");
    }
    
    public void RemoveMatterCube(int matterId)
    {
        if (matterCubes.ContainsKey(matterId))
        {
            GameObject cube = matterCubes[matterId];
            if (cube != null)
            {
                Destroy(cube);
            }
            matterCubes.Remove(matterId);
            Debug.Log($"Removed cube for matter {matterId}");
        }
    }
    
    public void UpdateMatterCubes()
    {
        if (matterManager == null) return;
        
        // Get all current matter IDs
        int[] allMatterIds = matterManager.GetAllMatterIds();
        
        // Create cubes for new matters (but skip items previously picked up by player)
        foreach (int matterId in allMatterIds)
        {
            if (!matterCubes.ContainsKey(matterId) && !pickedUpItems.Contains(matterId))
            {
                CreateMatterCube(matterId);
            }
        }
        
        // Remove cubes for matters that no longer exist
        List<int> cubesToRemove = new List<int>();
        foreach (var kvp in matterCubes)
        {
            if (!matterManager.HasMatterData(kvp.Key))
            {
                cubesToRemove.Add(kvp.Key);
            }
        }
        
        foreach (int matterId in cubesToRemove)
        {
            RemoveMatterCube(matterId);
        }
    }
    
    /// <summary>
    /// Called when a pickup is successful. Removes the cube for the picked up item.
    /// </summary>
    /// <param name="tid">Template ID of the picked up item</param>
    public void OnPickupSuccess(int tid)
    {
        if (pendingPickups.ContainsKey(tid))
        {
            int matterId = pendingPickups[tid];
            
            // Track this item as picked up by the player
            pickedUpItems.Add(matterId);
            
            // Remove the cube
            RemoveMatterCube(matterId);
            
            // Remove from pending pickups
            pendingPickups.Remove(tid);
            
            Debug.Log($"Successfully picked up item with TID: {tid}, removed cube for matter ID: {matterId}");
        }
        else
        {
            Debug.LogWarning($"Received pickup success for TID {tid} but no pending pickup found");
        }
    }
    
    /// <summary>
    /// Called when a pickup fails. Removes the pending pickup tracking.
    /// </summary>
    /// <param name="tid">Template ID of the failed pickup</param>
    public void OnPickupFailed(int tid)
    {
        if (pendingPickups.ContainsKey(tid))
        {
            pendingPickups.Remove(tid);
            Debug.Log($"Pickup failed for TID: {tid}, removed from pending pickups");
        }
    }
    
    /// <summary>
    /// Clears the tracking of picked up items. Call this when player changes areas or logs out.
    /// </summary>
    public void ClearPickedUpItemsTracking()
    {
        pickedUpItems.Clear();
        Debug.Log("Cleared picked up items tracking");
    }
    
    /// <summary>
    /// Gets the count of items that have been picked up by the player.
    /// </summary>
    /// <returns>Number of items picked up</returns>
    public int GetPickedUpItemsCount()
    {
        return pickedUpItems.Count;
    }


    private void OnDestroy()
    {
        // Clean up all matter cubes
        foreach (var kvp in matterCubes)
        {
            if (kvp.Value != null)
            {
                Destroy(kvp.Value);
            }
        }
        matterCubes.Clear();
        
        // Clean up pending pickups
        pendingPickups.Clear();
        
        // Clean up picked up items tracking
        pickedUpItems.Clear();
    }
}

// Helper class to handle click events on matter cubes
public class MatterCubeClickHandler : MonoBehaviour
{
    private int matterId;
    private pickupItem pickupItemScript;
    
    public void Initialize(int id, pickupItem script)
    {
        matterId = id;
        pickupItemScript = script;
    }
    
    private void OnMouseDown()
    {
        if (pickupItemScript != null)
        {
            pickupItemScript.SendPickupCommand(matterId);
        }
    }
}

// Simple Billboard component to make text always face the camera
public class Billboard : MonoBehaviour
{
    private Camera mainCamera;
    
    void Start()
    {
        mainCamera = Camera.main;
        if (mainCamera == null)
        {
            mainCamera = FindFirstObjectByType<Camera>();
        }
    }
    
    void Update()
    {
        if (mainCamera != null)
        {
            // Make the text face the camera
            transform.LookAt(mainCamera.transform);
            transform.Rotate(0, 180, 0); // Flip to face the camera properly
        }
    }
}