using System;
using System.Collections;
using game;
using UnityEngine;

namespace RND
{

    public class Session : MonoBehaviour
    {
        public event Action OnLevelStarted;
        public event Action<EnumLevelResult> OnLevelEnded;
        public event Action OnLevelSkip;

        public Level Level { get; private set; }
        public int EarnedCoins => _earnedCoinsAmount;
        public GameObject LevelHolder { get; private set; }

        private int _earnedCoinsAmount;

        public void Init()
        {
        }

        private IEnumerator Launch()
        {
            _earnedCoinsAmount = 0;
            Level.Play();

            yield return null;
        }

        private IEnumerator LoadLevel()
        {
            UI.Show<MainWindow>();

            var coinsWindow = UI.GetOrCreate<CoinsCounterWindow>();
            coinsWindow.SyncCoinsCounter();
            coinsWindow.Show();

            TryClear();
            CreateLevelById(Save.Progress.LevelId);

            Level.OnEnded += OnLevelEndedHandler;
            Level.Init();

            yield return null;
        }

        private void TryClear()
        {
            if (LevelHolder == null)
                return;

            Level.OnEnded -= OnLevelEndedHandler;

            foreach (Transform child in LevelHolder.transform)
                Destroy(child.gameObject);

            Destroy(LevelHolder.gameObject);
        }


        private void CreateLevelById(uint level)
        {
            if (LevelHolder == null)
                LevelHolder = new GameObject("LevelHolder");

            GameObject prefab = LevelSettings.GetPrefabByID(level);
            GameObject created = Instantiate(prefab, LevelHolder.transform);
            created.transform.name = $"Level {level}";

            Level = created.GetComponent<Level>();
        }

        public void AddEarnedCoins(int amount) => _earnedCoinsAmount += amount;
        public void MultiplyEarnedCoins(int multiplier) => _earnedCoinsAmount *= multiplier;

        public void SaveEarnedCoins()
        {
            Save.Inventory.AddConsumableItem(EnumConsumable.COIN, (uint) EarnedCoins);
            _earnedCoinsAmount = 0;
        }

        private void OnLevelEndedHandler(EnumLevelResult result)
        {
            if (result == EnumLevelResult.WIN)
                Save.Progress.IncreaseLevel();

            OnLevelEnded?.Invoke(result);
        }

        public static Session Create()
        {
            return new GameObject("Session").AddComponent<Session>();
        }

        public void CreateLevel()
        {
            StartCoroutine(LoadLevel());
        }

        public void LaunchLevel()
        {
            StartCoroutine(Launch());
            OnLevelStarted?.Invoke();
        }

        public void CreateAndLaunchLevel()
        {
            StartCoroutine(ForceLaunch());
        }

        private IEnumerator ForceLaunch()
        {
            yield return LoadLevel();
            LaunchLevel();
        }

        public void SkipLevel()
        {
            OnLevelSkip?.Invoke();
            Save.Progress.IncreaseLevel();
            BuildLevel();
        }

        public void Restart()
        {
            BuildLevel();
        }

        public void BuildLevel()
        {
            UI.HideVisibleStack();
            CreateLevel();
        }
    }
}