using System.Collections;
using System.Collections.Generic;
using TMPro;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;
using DG.Tweening;
using EpicToonFX;

public class InventoryItemEvents : Selectable, IPointerDownHandler, IPointerUpHandler, IPointerEnterHandler,
    IPointerExitHandler, IDragHandler, IBeginDragHandler
{
    private int slotId;
    private Vector3 originalPosition;
    private Image thisImage;

    [SerializeField] private Image backgroundImage;
    private TextMeshProUGUI inspectText;

    private GameObject bankVault;
    private WeaponStatsManager statsManager;

    protected override void Awake()
    {
        //Selectable runs in edit mode, so we need to find objects only at runtime.
        base.Awake();
        if (Application.isPlaying)
        {
            inspectText = GameObject.Find("Inventory_inspect").GetComponent<TextMeshProUGUI>();
        }

        this.enabled = true;
    }

    private bool ForgeOpen() => UIManager.Instance.ForgeController.gameObject.activeSelf;
    private bool ExchangeOpen() => UIManager.Instance.WeaponExchangeController.gameObject.activeSelf;
    
    private bool InventoryOpen() => UIManager.Instance.Inventory.gameObject.activeSelf;
    private bool BankOpen() => UIManager.Instance.BankVaultCanvas.activeInHierarchy;

    protected override void Start()
    {
        base.Start();
        originalPosition = gameObject.transform.position;
        slotId = int.Parse(gameObject.name.Substring(15));
        thisImage = GetComponent<Image>();
        statsManager = UIManager.Instance.WeaponStatsManager;
        bankVault = UIManager.Instance.BankVaultCanvas;
    }

    public override void OnSelect(BaseEventData eventData)
    {
        base.OnSelect(eventData);
        if (Player.Instance.GetInputHandler().UsingGamePad)
        {
            EnterSlot();
        }
    }

    public override void OnDeselect(BaseEventData eventData)
    {
        base.OnDeselect(eventData);
        if (Player.Instance.GetInputHandler().UsingGamePad)
        {
            OnExit();
        }
    }

    public override void OnPointerEnter(PointerEventData eventData)
    {
        base.OnPointerEnter(eventData);
        EnterSlot();
    }

    public void EnterSlot()
    {
        //Debug.Log(this.gameObject.name + " Was entered.");
        int itemID = InventoryManager.Instance.inventoryItems[slotId];
        string itemName = ItemDef.GetInstance().getItemName(itemID);
        string itemLevel = ItemDef.GetInstance().getItemLevel(itemID);
        string itemDescription = InventoryManager.Instance.itemDescriptions[slotId];
        if (itemName == "")
        {
            if (!(
                    ForgeOpen()||
                    InventoryOpen() ||
                    ExchangeOpen()
                    )) 
                return;
            statsManager.GetCanvasGroup().alpha = 0;
            return;
        }

        inspectText.SetText($"{itemLevel.ToUpper()} {itemName.ToUpper()}: {itemDescription.ToUpper()}");
        transform.DOScale(Vector3.one * 1.15f, 0.1f).SetEase(Ease.InSine).SetUpdate(true);

        if (!(
                ForgeOpen()||
                InventoryOpen()||
                ExchangeOpen()
            )) 
            return;
        
        int weaponData = InventoryManager.Instance.inventoryItems[slotId];
        statsManager.SetWeaponStatData(GetOpenSettingType(), weaponData);
    }

    private OpenWeaponStatType GetOpenSettingType()
    {
        if (ForgeOpen())
            return OpenWeaponStatType.Forge;
        if (InventoryOpen())
            return OpenWeaponStatType.Inventory;
        if (ExchangeOpen())
            return OpenWeaponStatType.Exchange;
        return OpenWeaponStatType.Base;
    }

    public override void OnPointerExit(PointerEventData eventData)
    {
        base.OnPointerExit(eventData);
        OnExit();
    }

    public void OnExit()
    {
        //Debug.Log(this.gameObject.name + " Was exited.");

        inspectText.text = "";
        if (EventSystem.current.currentSelectedGameObject != null)
            EventSystem.current.SetSelectedGameObject(null); //ERROR HERE

        statsManager.GetCanvasGroup().DOFade(0, 0.15f);
        transform.DOScale(Vector3.one, 0.1f).SetEase(Ease.OutSine).SetUpdate(true);
    }

    public override void OnPointerDown(PointerEventData eventData)
    {
        base.OnPointerDown(eventData);
        OnClick();
    }

    public void OnClick()
    {
        if (InventoryManager.Instance.inventoryItems[slotId] == -1)
            return;
        //Debug.Log(this.gameObject.name + " Was Clicked.");
        //thisImage.color = new Color(0.8f, 0.8f, 0.8f);
    }

    public void OnBeginDrag(PointerEventData eventData)
    {
        //transform.parent = InventoryPanel.transform;
        //transform.SetAsLastSibling();
    }

    public override void OnPointerUp(PointerEventData eventData)
    {
        base.OnPointerUp(eventData);
        OnClickUp(Input.mousePosition);
    }

    public void OnClickUp(Vector3 mousePosition)
    {
        if (InventoryManager.Instance.inventoryItems[slotId] == -1)
        {
            return;
        }

        thisImage.color = Color.white;

        if (Vector3.Distance(transform.position, originalPosition) > 3)
        {
            //Create a list of Raycast Results
            List<RaycastResult> results = new List<RaycastResult>();
            PointerEventData ped = new PointerEventData(EventSystem.current);
            ped.position = mousePosition;
            transform.GetComponentInParent<GraphicRaycaster>().Raycast(ped, results);

            if (!(bankVault.activeInHierarchy || ForgeOpen() || ExchangeOpen()) && results.Count <= 1)
            {
                //Debug.Log("dropping " + InventoryManager.Instance.inventoryItems[slotId]);
                if (InventoryManager.Instance.inventoryItems[slotId] != -1)
                    PacketManager.sendDropItem(InventoryManager.Instance.inventoryItems[slotId], slotId);
            }
            else
            {
                //For every result returned, output the name of the GameObject on the Canvas hit by the Ray
                foreach (RaycastResult result in results)
                {
                    if (result.gameObject.name.Contains("slot"))
                    {
                        int to = int.Parse(result.gameObject.name.Substring(4));
                        if (to != slotId)
                        {
                            PacketManager.sendMoveItem(slotId, to, 0);
                        }
                    }
                }
            }
        }
        else
        {
            //only allow dropping if not in menus
            if (!(BankOpen() || ForgeOpen() || ExchangeOpen()))
            {
                if (Input.GetKey(KeyCode.LeftShift))
                {
                    PacketManager.sendDropItem(InventoryManager.Instance.inventoryItems[slotId], slotId);
                }
            }

            if (ExchangeOpen())
            {
                int itemID = InventoryManager.Instance.inventoryItems[slotId];
                string itemName = ItemDef.GetInstance().getItemName(itemID);
                string itemLevel = ItemDef.GetInstance().getItemLevel(itemID);
                WeaponExchangeController exchangeController = UIManager.Instance.WeaponExchangeController;
                exchangeController.SetSellButtonText(itemLevel, itemName, itemID);
            }
            



            if (!ForgeOpen() && !ExchangeOpen())
            {
                PacketManager.sendClickItem(InventoryManager.Instance.inventoryItems[slotId], slotId);
            }
        }

        gameObject.transform.position = originalPosition;
    }

    public void GamepadDropEvent()
    {
        if (!(bankVault.activeInHierarchy || ForgeOpen() || ExchangeOpen()) &&
            InventoryManager.Instance.inventoryItems[slotId] != -1)
            PacketManager.sendDropItem(InventoryManager.Instance.inventoryItems[slotId], slotId);
    }

    public void OnDrag(PointerEventData eventData)
    {
        if (InventoryManager.Instance.inventoryItems[slotId] == -1 || ForgeOpen() || ExchangeOpen() ||
            bankVault.activeInHierarchy)
            return;

        transform.position += (Vector3)eventData.delta;
    }

    public void OnClickDrag()
    {
    }
}