using System.Collections.Generic;
using UnityEngine;
using NEG.UI.Popup;
using NEG.UI.Window;
using NEG.UI.WindowSlot;

namespace NEG.UI.Area
{
    public class MonoArea : MonoBehaviour, IArea
    {
        public IEnumerable<IWindowSlot> AvailableSlots => windowSlots;
        public IWindowSlot DefaultWindowSlot => windowSlots[0];
        public IEnumerable<IWindow> CurrentWindows { get; }
        public IEnumerable<IPopup> CurrentPopups => currentPopups;

        [SerializeField] private List<MonoWindowSlot> windowSlots;

        [SerializeField] private Queue<IPopup> currentPopups = new(); 

        public void SetEnabled(bool setEnabled) => gameObject.SetActive(setEnabled);

        public void OpenWindow(IWindow window) => DefaultWindowSlot.AttachWindow(window);

        public void OpenPopup(IPopup popup)
        {
            currentPopups.Enqueue(popup);
            popup.OnPopupClosed += OnPopupClosed;
            popup.Show();
            UpdatePopupStates();
        }

        private void UpdatePopupStates()
        {
            if(currentPopups.Count == 0)
                return;

            while (currentPopups.TryPeek(out var popup))
            {
                if(popup.IsValid)
                    popup.SetEnabled(true);

                currentPopups.Dequeue();
            }
        }

        private void OnPopupClosed(IPopup popup)
        {
            if (!currentPopups.Contains(popup))
                return;

            if(currentPopups.Peek() != popup)
                return;

            currentPopups.Dequeue();
            UpdatePopupStates();
        }
    }
}