using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using RPGCreationKit;
using RPGCreationKit.Player;
using UnityEngine.EventSystems;
using UnityEngine.InputSystem;
using TMPro;

namespace RPGCreationKit
{
	/// <summary>
	/// Class that manages the UI for the Inventory
	/// </summary>
	public class InventoryUI : MonoBehaviour
	{

		#region Singleton
		public static InventoryUI instance;

		private void Awake()
		{
			if (instance == null)
				instance = this;
			else
			{
				Debug.LogError("Anomaly detected with the Singleton Pattern of 'InventoryUI', are you using multple InventoryUIs?");
				Destroy(this);
			}
		}
		#endregion

		public Inventory inventory;
		public Equipment playerEquipment;
		public ItemsInListPoolManager itemsPoolManager;

		public InventoryTabs selectedTab;
		public CharacterTabs selectedCharacterTab;

		[Header("UI Elements")]
		public GameObject UI;
		public Transform scrollView;
		public TextMeshProUGUI CatLabel;

		public DropItemsPanel dropItemsPanel;

		public Text currentWeightText;
		public Text maxWeightText;

		public Text ArmorRatingText;
		public Text GoldsText;

		[HideInInspector] public bool isOpen = false;

		[SerializeField] private Transform inventoryItemsContent;

		public bool dropKeyBeingHeld;

		public void INPUT_DropKeyKeyboardOnly(InputAction.CallbackContext value)
		{
			if (value.started)
				dropKeyBeingHeld = true;
			else if (value.canceled)
				dropKeyBeingHeld = false;
		}

		// Use this for initialization
		void Start()
		{
			/// Grab the PlayerInventory
			if (Inventory.PlayerInventory)
				inventory = Inventory.PlayerInventory;
			else
				Debug.LogError("Could not retrieve the Player Inventory from the Singleton pattern, are you missing 'Inventory' component on the Player GameObject?");

			
			playerEquipment = Equipment.PlayerEquipment;
		}

		// Update is called once per frame
		void Update() {
			if (RckPlayer.instance.input.currentActionMap.name == "Player" || RckPlayer.instance.input.currentActionMap.name == "InventoryUI") {
				if (RckPlayer.instance.input.currentActionMap.FindAction("OpenCloseInventory").triggered && 
					!QuestManagerUI.instance.isUIopened && !RckPlayer.instance.isInConversation && !TradeSystemUI.instance.isOpen && 
					!RckPlayer.instance.isInteracting && !RckPlayer.instance.isReadingBook && !RckPlayer.instance.isLooting && 
					!TutorialAlertMessage.instance.messageOpened && !RckPlayer.instance.isPickingLock) {
					OpenClose();
				}
			}
		}

		public void OpenClose() {
			if (RckPlayer.instance.isReadingBook || RckPlayer.instance.isPickingLock) {
				return;
			}

			RckPlayer.instance.EnableDisableControls(UI.activeInHierarchy);

			if (!UI.activeInHierarchy) {
				// Open
				isOpen = true;
				InventoryUI.instance.itemsPoolManager.PopulateAll();

				UpdateStatsUI();
				ShowTabItems();

				PlayerInInventory.instance.ShowHideCharacter(true);

				RckPlayer.instance.input.SwitchCurrentActionMap("InventoryUI");
			}
			else
			{
				// Close		  
				dropItemsPanel.CancelButton();
				isOpen = false;
				InventoryUI.instance.itemsPoolManager.ResetPools();

				PlayerInInventory.instance.ShowHideCharacter(false);

				RckPlayer.instance.input.SwitchCurrentActionMap("Player");
			}

			UI.SetActive(!UI.activeInHierarchy);
		}

		public void ChangeTab(InventoryTabs tab)
		{
			selectedTab = tab;

			/// Show Tab
			ShowTabItems();
		}

		public void ChangeCharacterTab(int tab)
		{
			selectedCharacterTab = (CharacterTabs)tab;
		}

		public void ShowTabItems()
		{
			switch(selectedTab)
			{
				case InventoryTabs.All:
					itemsPoolManager.ShowAll();
					CatLabel.text = "Everything";
					break;

				case InventoryTabs.Armors:
					itemsPoolManager.ArmorsTab();
					CatLabel.text = "Armor";
					break;

				case InventoryTabs.Keys:
					itemsPoolManager.KeysTab();
					CatLabel.text = "Keys";
					break;

				case InventoryTabs.MiscItems:
					itemsPoolManager.MiscTab();
					CatLabel.text = "Misc";
					break;

				case InventoryTabs.Weapons:
					itemsPoolManager.WeaponsTab();
					CatLabel.text = "Weapons";
					break;

				case InventoryTabs.Ammos:
					itemsPoolManager.AmmoTab();
					CatLabel.text = "Ammo";
					break;

				case InventoryTabs.Books:
					itemsPoolManager.BookTab();
					CatLabel.text = "Books";
					break;

				case InventoryTabs.Consumables:
					itemsPoolManager.ConsumableTab();
					CatLabel.text = "Consumables";
					break;
				
			}

			SelectFirstButton();
		}

		public void SelectFirstButton()
		{
			if (!RckInput.isUsingGamepad)
				return;

			StartCoroutine(SelectFirstButtonC());
		}

		public GameObject grabbed;

		public void MoveSafe(MoveDirection direction)
		{
			AxisEventData data = new AxisEventData(EventSystem.current)
			{
				moveDir = direction,
				selectedObject = EventSystem.current.currentSelectedGameObject
			};
			ExecuteEvents.Execute(data.selectedObject, data, ExecuteEvents.moveHandler);

			grabbed = EventSystem.current.currentSelectedGameObject;

			// Revert
			if (data.moveDir == MoveDirection.Up)
				data.moveDir = MoveDirection.Down;
			else if (data.moveDir == MoveDirection.Down)
				data.moveDir = MoveDirection.Up;

			data.selectedObject = EventSystem.current.currentSelectedGameObject;
			ExecuteEvents.Execute(data.selectedObject, data, ExecuteEvents.moveHandler);

			StartCoroutine(SelectNextButtonC(grabbed));
		}


		public void SelectNextButton(bool calledFromDropPanel = false)
		{
			if (!RckInput.isUsingGamepad)
				return;

			if (UINavigationHelper.CanNavigateDown())
				MoveSafe(MoveDirection.Down);
			else if (UINavigationHelper.CanNavigateUp())
				MoveSafe(MoveDirection.Up);
			else
				StartCoroutine(SelectFirstButtonC());
		}


		private IEnumerator SelectFirstButtonC()
		{
			yield return new WaitForEndOfFrame();
			EventSystem.current.SetSelectedGameObject(null);
			var a = inventoryItemsContent.GetComponentInChildren<Button>();
			if (a != null)
				EventSystem.current.SetSelectedGameObject(a.gameObject, null);
		}

		private IEnumerator SelectNextButtonC(GameObject go)
		{
			yield return new WaitForEndOfFrame();
			EventSystem.current.SetSelectedGameObject(null);
			EventSystem.current.SetSelectedGameObject(go);
		}

		public void UpdateStatsUI()
		{
			ArmorRatingText.text = ((int)playerEquipment.ArmorRate).ToString();
			currentWeightText.text = ((int)inventory.CurTotalWeight).ToString();
			GoldsText.text = (inventory.GetItemCount("Gold001").ToString());
		}

		public void UpdateAllItems()
		{
			for (int i = 0; i < itemsPoolManager.AmmosPool.usedObjects.Count; i++)
				itemsPoolManager.AmmosPool.usedObjects[i].UpdateItem();

			for (int i = 0; i < itemsPoolManager.ArmorsPool.usedObjects.Count; i++)
				itemsPoolManager.ArmorsPool.usedObjects[i].UpdateItem();
			
			
			for (int i = 0; i < itemsPoolManager.WeaponsPool.usedObjects.Count; i++)
				itemsPoolManager.WeaponsPool.usedObjects[i].UpdateItem();
		}


	}
}