using UnityEngine;
using UnityEngine.SceneManagement;
using System.Collections;

namespace Completed
{
	using System.Collections.Generic;
	using UnityEngine.UI;

	public class GameManager : MonoBehaviour
	{
		public float levelStartDelay = 2f;
		public float turnDelay = 0.1f;
		public int playerFoodPoints = 100;
		public static GameManager instance = null;
		[HideInInspector] public bool playersTurn = true;


		private Text levelText;
		private GameObject levelImage;
		private BoardManager boardScript;
		private int level = 1;
		private List<Enemy> enemies;
		private bool enemiesMoving;
		private bool doingSetup = true;




		void Awake()
		{

            if (instance == null)


                instance = this;


            else if (instance != this)




			DontDestroyOnLoad(gameObject);


			enemies = new List<Enemy>();


			boardScript = GetComponent<BoardManager>();


			InitGame();
		}


        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.AfterSceneLoad)]
        static public void CallbackInitialization()
        {

            SceneManager.sceneLoaded += OnSceneLoaded;
        }


        static private void OnSceneLoaded(Scene arg0, LoadSceneMode arg1)
        {
            instance.level++;
            instance.InitGame();
        }



		void InitGame()
		{

			doingSetup = true;


			levelImage = GameObject.Find("LevelImage");


			levelText = GameObject.Find("LevelText").GetComponent<Text>();


			levelText.text = "Day " + level;


			levelImage.SetActive(true);


			Invoke("HideLevelImage", levelStartDelay);


			enemies.Clear();


			boardScript.SetupScene(level);

		}



		void HideLevelImage()
		{

			levelImage.SetActive(false);


			doingSetup = false;
		}


		void Update()
		{

			if(playersTurn || enemiesMoving || doingSetup)


				return;


			StartCoroutine (MoveEnemies ());
		}


		public void AddEnemyToList(Enemy script)
		{

			enemies.Add(script);
		}



		public void GameOver()
		{

			levelText.text = "After " + level + " days, you starved.";


			levelImage.SetActive(true);


			enabled = false;
		}


		IEnumerator MoveEnemies()
		{

			enemiesMoving = true;


			yield return new WaitForSeconds(turnDelay);


			if (enemies.Count == 0)
			{

				yield return new WaitForSeconds(turnDelay);
			}


			for (int i = 0; i < enemies.Count; i++)
			{

				enemies[i].MoveEnemy ();


				yield return new WaitForSeconds(enemies[i].moveTime);
			}

			playersTurn = true;


			enemiesMoving = false;
		}
	}
}