using NEG.UI.Area;
using NEG.UI.Popup;
using NEG.UI.UnityUi.Popup;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AddressableAssets;
using UnityEngine.Assertions;
using UnityEngine.SceneManagement;

namespace NEG.UI.UnityUi
{
    /// <summary>
    /// Implements ui using UnityUI and Unity Event System with New Input System.
    /// <para>You have to provide prefabs with addresses:</para>
    /// <para> - NEG/UI/PopupCanvas - prefab with canvas to create popups (will be created on every scene)</para>
    /// <para> - NEG/UI/DefaultPopupPrefab - prefab of default popup with 2 options (has to have <see cref="MonoDefaultPopup"/> component)</para>
    /// </summary>
    public class MonoUiManager : UiManager
    {
        //TODO: use default unity selection
        //TODO: window snaping to slots
        
        private readonly MonoDefaultPopup defaultPopupPrefab;
        private readonly GameObject canvasPrefab;

        public MonoUiManager(IArea startArea) : base(startArea)
        {
            var prefabs =
                Addressables.LoadAssetsAsync<GameObject>(new List<string>() { "NEG/UI/PopupCanvas", "NEG/UI/DefaultPopupPrefab" }, (_) => { }, Addressables.MergeMode.Union).WaitForCompletion();
      
            Assert.AreEqual(prefabs.Count, 2, "No prefabs was provided. Please check MonoUiManager class documentation");
            Assert.IsNotNull(prefabs[0].GetComponent<Canvas>());
            Assert.IsNotNull(prefabs[1].GetComponent<MonoDefaultPopup>());
            
            canvasPrefab = prefabs[0];
            defaultPopupPrefab = prefabs[1].GetComponent<MonoDefaultPopup>();
            
            SpawnDefaultPopup();

            SceneManager.activeSceneChanged += (_, _) => SpawnDefaultPopup();
        }

        private void SpawnDefaultPopup()
        {
            var canvas = Object.Instantiate(canvasPrefab);
            canvas.name = "DefaultPopupCanvas";
            SetDefaultPopup(Object.Instantiate(defaultPopupPrefab, canvas.transform));
            currentDefaultPopup.Close(true);
        }
        
    }
}