using System.Collections.Generic;
using UnityEngine;

// InventoryManager.cs
public class EquipmentManager : MonoBehaviour, IItemManager<Slot>
{
    public static EquipmentManager Instance;
    public readonly Dictionary<int, Slot> Slots = new();

    public Slot ActiveSlot { get; set; }

    private void Awake()
    {
        if (Instance == null)
        {
            Instance = this;
            DontDestroyOnLoad(gameObject);
        }
        else
        {
            Destroy(gameObject);
        }
    }

    private void Start()
    {
        Debug.Log("EquipmentManager Start");
        Initialize();
    }

    public GameItem GetItemFromSlot(int slotId)
    {
        return Slots.TryGetValue(slotId, out var slot) ? slot.item : null;
    }

    public void RemoveItemFromSlot(int slotId)
    {
        if (Slots.TryGetValue(slotId, out var slot))
            slot.item = null;
        else
            Debug.LogWarning("Slot not found: " + slotId);
    }

    public void AddItemToOpenSlot(GameItem item)
    {
        foreach (var slot in Slots.Values)
            if (slot.IsEmpty())
            {
                slot.item = item;
                Debug.Log("Added item to slot: " + slot.slotId + " / " + item.name);
                return;
            }

        Debug.LogWarning("No empty slots available to add item: " + item.name);
    }

    public void AddItemToSlot(GameItem item, int slotId)
    {
        if (Slots.TryGetValue(slotId, out var slot))
            slot.item = item;
        else
            Debug.LogWarning("Slot not found: " + slotId);
    }

    public void RemoveSlot(int slotId)
    {
        Slots.Remove(slotId);
    }

    public void SwapItems(int slotId1, int slotId2)
    {
        if (Slots.TryGetValue(slotId1, out var slot1) &&
            Slots.TryGetValue(slotId2, out var slot2))
            (slot1.item, slot2.item) = (slot2.item, slot1.item);
    }

    public void AddSlot(Slot slot)
    {
        Slots[slot.slotId] = slot;
    }

    public Slot GetSlot(int slotId)
    {
        return Slots.GetValueOrDefault(slotId, null);
    }


    public void RemoveItemFromSlot(GameItem item)
    {
        foreach (var slot in Slots.Values)
            if (slot.item == item)
            {
                slot.item = null;
                Debug.Log("Removed item from slot: " + item.name);
                return;
            }

        Debug.LogWarning("Item not found in any slot: " + item.name);
    }

    public void SetItemInSlot(int slotId, GameItem item)
    {
        // TODO: check if item is valid for slot
        if (Slots.TryGetValue(slotId, out var slot))
            slot.item = item;
        else
            Debug.LogWarning("Slot not found: " + slotId);
    }

    public void SetActiveSlot(int slotId)
    {
        ActiveSlot = Slots[slotId];
    }


    public void Initialize()
    {
        // create player slots for inventory
        var equipmentSlot = ScriptableObject.CreateInstance<Slot>();
        equipmentSlot.slotId = 0;
        equipmentSlot.item = null;
        equipmentSlot.slotType = Slot.SlotType.Equipment;
        equipmentSlot.allowedItemTypes.Add(GameItem.ItemType.Helmet);
        AddSlot(equipmentSlot);

        equipmentSlot = ScriptableObject.CreateInstance<Slot>();
        equipmentSlot.slotId = 1;
        equipmentSlot.slotType = Slot.SlotType.Equipment;
        equipmentSlot.allowedItemTypes.Add(GameItem.ItemType.Accessory);
        equipmentSlot.item = null;
        AddSlot(equipmentSlot);

        // feet
        equipmentSlot = ScriptableObject.CreateInstance<Slot>();
        equipmentSlot.slotId = 2;
        equipmentSlot.slotType = Slot.SlotType.Equipment;
        equipmentSlot.allowedItemTypes.Add(GameItem.ItemType.Armor);
        equipmentSlot.item = null;
        AddSlot(equipmentSlot);


        equipmentSlot = ScriptableObject.CreateInstance<Slot>();
        equipmentSlot.slotId = 3;
        equipmentSlot.slotType = Slot.SlotType.Equipment;

        equipmentSlot.allowedItemTypes.Add(GameItem.ItemType.Accessory);
        equipmentSlot.allowedItemTypes.Add(GameItem.ItemType.Ring);
        equipmentSlot.item = null;
        AddSlot(equipmentSlot);

        equipmentSlot = ScriptableObject.CreateInstance<Slot>();
        equipmentSlot.slotId = 4;
        equipmentSlot.slotType = Slot.SlotType.Equipment;
        equipmentSlot.allowedItemTypes.Add(GameItem.ItemType.Boots);
        equipmentSlot.item = null;
        AddSlot(equipmentSlot);

        equipmentSlot = ScriptableObject.CreateInstance<Slot>();
        equipmentSlot.slotId = 5;
        equipmentSlot.slotType = Slot.SlotType.Equipment;
        equipmentSlot.allowedItemTypes.Add(GameItem.ItemType.Ring);
        equipmentSlot.item = null;
        AddSlot(equipmentSlot);

        Debug.Log("Completed Initialized items in EquipmentManager");
    }
}