using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

namespace SimpleInventorySystem
{
    public class GroupSlotUI : MonoBehaviour
    {
        public SlotUI slot;
        public SlotUI[] slots;
        public bool requireAllSlots;
        public GameObject[] showGameObjects;
        public SlotUI[] incompatibleSlots;
        public GameObject[] hideGameObjects;
        public List<ItemTags> AllowedItemTags;
        private bool conditionMet;

        // Start is called before the first frame update
        void Start()
        {
            if (slot != null)
            {
                slot.groupSlots.Add(this);
            }
            if (slots != null)
            {
                foreach (SlotUI s in slots)
                {
                    s.groupSlots.Add(this);
                }
            }
        }

        public bool IsSlotInShowGameObjects(SlotUI slotUI)
        {
            foreach(GameObject sgo in showGameObjects)
            {
                if(sgo.GetComponent<SlotUI>() == slotUI)
                {
                    return true;
                }
            }
            return false;
        }

        public bool IsSlotBeingShown(SlotUI slotUI)
        {
            foreach (GameObject sgo in showGameObjects)
            {
                if (sgo.GetComponent<SlotUI>() == slotUI)
                {
                    return ConditionMet();
                }
            }
            return false;
        }

        public bool HasSlotOccupied()
        {
            return slot.GetItemUI() != null;
        }

        public bool ConditionMet()
        {
            return conditionMet;
        }
        
        public void ShowUIContainer()
        {
            foreach(GameObject uiContainerGameObject in showGameObjects)
            {
                uiContainerGameObject.SetActive(true);
            }
            foreach (GameObject uiContainerGameObject in hideGameObjects)
            {
                uiContainerGameObject.SetActive(false);
            }
            conditionMet = true;
        }

        public void HideUIContainer()
        {
            foreach (GameObject uiContainerGameObject in showGameObjects)
            {
                //Debug.Log("Hide: " + uiContainerGameObject.name);
                uiContainerGameObject.SetActive(false);
            }
            foreach (GameObject uiContainerGameObject in hideGameObjects)
            {
                uiContainerGameObject.SetActive(true);
            }
            conditionMet = false;
        }

        // Update is called once per frame
        void Update()
        {
        
        }

        // TODO: Could use improvement
        public bool HasSlotsOccupied()
        {
            if (slot != null && slot.GetItemUI() == null && (slots == null || slots.Length == 0))
            {
                //Debug.Log("A");
                return false;
            }
            else if(slots != null && slots.Length > 0)
            {
                bool atLesatOneSlot = false;
                foreach(SlotUI s in slots)
                {
                    if (s.GetItemUI() == null)
                    {
                        if (requireAllSlots)
                        {
                            //Debug.Log("B");
                            return false;
                        }
                    }
                    else
                    {
                        atLesatOneSlot = true;
                        if (!requireAllSlots)
                        {
                            break;
                        }
                    }
                }

                if(!atLesatOneSlot && !requireAllSlots)
                {
                    //Debug.Log("C");
                    return false;
                }
            }
            //Debug.Log("D");
            return true;
        }

        public bool HasIncompatibleSlotsOccupied()
        {
            if(incompatibleSlots != null)
            {
                foreach(SlotUI s in incompatibleSlots)
                {
                    if(s.GetItemUI() != null)
                    {
                        return true;
                    }
                }
            }
            return false;
        }

        internal void OnItemDropped()
        {
            bool allowed = AllowedItemTags == null || AllowedItemTags.Count == 0 || AllowedItemTags.Contains(ItemTags.Any) || AllowedItemTags.Contains(slot.GetItemUI().ItemTag);

            if (HasSlotsOccupied() && !HasIncompatibleSlotsOccupied() && allowed)
            {
                ShowUIContainer();
            }
        }

        internal void OnItemRemoved()
        {
            Debug.Log("GroupSlotUI: Removed Item");
            if (!HasSlotsOccupied())
            {
                Debug.Log("GroupSlotUI: Hide UI");
                HideUIContainer();
            }
        }
    }
}