using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.Events;
using TMPro;
using Sirenix.OdinInspector;
using KairoEngine.Core;
using KairoEngine.UI;

namespace KairoEngine.Inventory
{

    public class ItemContainerUi : MonoBehaviour
    {
        public string containerTitle;
        public GameObject itemContainerPanel;
        public GameObject itemSlotPrefab;
        public bool generateSlots = true;
        public bool showPrice = false;
        public bool showValueText = false;
        public int itemSlotCount = 16;
        public Transform slotsContainer;
        public TextMeshProUGUI windowTitleText;
        public List<ItemSlotUi> itemSlots = new List<ItemSlotUi>();
        public ItemContainer targetItemContainer;

        void OnEnable()
        {
            ItemContainerEvents.StartListeningOnOpen(containerTitle, this.OnOpenWindow);
            ItemContainerEvents.StartListeningOnClose(containerTitle, this.OnCloseWindow);
            ItemContainerEvents.OnUpdate += this.OnUpdateItemContainer;
        }

        void OnDisable()
        {
            ItemContainerEvents.StopListeningOnOpen(containerTitle, this.OnOpenWindow);
            ItemContainerEvents.StopListeningOnClose(containerTitle, this.OnCloseWindow);
            ItemContainerEvents.OnUpdate -= this.OnUpdateItemContainer;
        }

        void Start()
        {
            InstantiateItemSlots();
        }

        private void InstantiateItemSlots()
        {
            if(generateSlots == false) return;
            for (int i = 0; i < itemSlotCount; i++)
            {
                GameObject itemSlotObj = GameObject.Instantiate(itemSlotPrefab, slotsContainer);
                ItemSlotUi itemSlotUi = itemSlotObj.GetComponentInChildren<ItemSlotUi>();
                if(itemSlotUi == null) Debug.LogError("ItemSlotPrefab GameObject is missing a ItemSlotUi component");
                else 
                {
                    itemSlots.Add(itemSlotUi);
                }
            }
        }

        private void ResetItemSlots()
        {
            for (int i = 0; i < itemSlots.Count; i++)
            {
                string value = "";
                if(showValueText) value = (i + 1).ToString();
                itemSlots[i].Setup(null, targetItemContainer, this, true, showPrice, value);
            }
        }

        public void SetWindowTitle(string title)
        {
            if(windowTitleText == null) 
            {
                return;
            }
            windowTitleText.text = title;

        }

        private void UpdateItemSlots()
        {
            List<ItemRef> itemList = targetItemContainer.ItemList;
            if(itemList == null)
            {
                Debug.LogError("Missing itemList in ItemContainerUI");
            }
            for (int i = 0; i < itemList.Count; i++)
            {
                ItemSlotUi slot = null;
                for (int a = 0; a < itemSlots.Count; a++)
                {
                    if (itemSlots[a].itemRef == null) 
                    {
                        slot =  itemSlots[a];
                        break;
                    }
                }
                string value = "";
                if(showValueText) value = (i + 1).ToString();
                if (slot != null) slot.Setup(itemList[i], targetItemContainer, this, true, showPrice, value);
                //else Debug.LogError("No available ItemSlotUi was found for item " + itemList[i].item.title);
            }
        }

        private void OnOpenWindow(ItemContainer itemContainer)
        {
            if(itemContainer == null)
            {
                Debug.LogError("EventOpenItemContainer contains no reference to target itemContainer");
                return;
            }
            targetItemContainer = itemContainer;
            if(!itemContainerPanel.activeSelf)
            {
                ResetItemSlots();
                UpdateItemSlots();
                SetWindowTitle(itemContainer.title);
                itemContainerPanel.SetActive(true); 
                UiAnimator[] animators = itemContainerPanel.GetComponentsInChildren<UiAnimator>(true);
                for (int i = 0; i < animators.Length; i++)
                {
                    animators[i].gameObject.SetActive(true);
                }
            }
        }

        private void OnCloseWindow()
        {
            UiAnimator panelAnimator = itemContainerPanel.GetComponent<UiAnimator>();
            UiAnimator[] animators = itemContainerPanel.GetComponentsInChildren<UiAnimator>();
            if(animators.Length > 0 || panelAnimator != null)
            {
                panelAnimator.Disable();
                foreach (var animator in animators)
                {
                    animator.Disable();
                }
            }  
            else
            {
                itemContainerPanel.SetActive(false);
            }
        }

        private void OnUpdateItemContainer(ItemContainer itemContainer)
        {
            if(itemContainer != targetItemContainer) return;
            if(itemContainer == targetItemContainer)
            {
                ResetItemSlots();
                UpdateItemSlots();
            }
        }

        public void CloseWindow()
        {
            ICommand closeInventoryCommand = new CloseItemContainerCommand(containerTitle);
            CommandInvoker.AddCommand(closeInventoryCommand);
        }
    }
}