using System;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;

public class TurnHandler : MonoBehaviour
{
    #region Statication

    public static TurnHandler instance;

    private void Awake()
    {
        if (instance != null && instance != this)
        {
            Destroy(gameObject);
            return;
        }
        instance = this;
    }

    #endregion
    
    [Header("Entity Lists")]
    public List<PlayerEntity> playerEntities = new();
    public List<Enemy> enemyEntities = new();
    public enum GameState {PlayerTurn, EnemyTurn}
    public GameState currentGameState = GameState.PlayerTurn;

    private int currentEnemy = 0;

    [Header("Spawning")] 
    [SerializeField] private int enemySpawnAmount;

    private void SortEnemies()
    {
        enemyEntities = enemyEntities.OrderBy(o=>o.turnSpeed).ToList();
    }

    private void Start()
    {
        SortEnemies();
    }

    public void UpdateTurns()
    {
        if (currentGameState == GameState.PlayerTurn)
        {
            foreach (PlayerEntity player in playerEntities)
            {
                if (!player.hasMoved || !player.hasAttacked)
                {
                    return;
                }
            }
            currentGameState = GameState.EnemyTurn;
            if (!enemyEntities[0])
            {
                EndRound();
            }
            else
            {
                enemyEntities[0].StartTurn();
            }
        }
        else if (currentGameState == GameState.EnemyTurn)
        {
            currentEnemy++;
            if (currentEnemy > enemyEntities.Count - 1)
            {
                EndRound();
                return;
            }
            enemyEntities[currentEnemy].StartTurn();
        }
    }

    private void EndRound()
    {
        EnvironmentTurn();
        currentEnemy = 0;
        currentGameState = GameState.PlayerTurn;
        foreach (PlayerEntity player in playerEntities)
        {
            player.hasMoved = false;
            player.hasAttacked = false;
        }
    }

    public void EnvironmentTurn()
    {
        EnemySpawner.instance.SpawnEnemy(enemySpawnAmount);
    }

    public void SkipAll()
    {
        foreach (PlayerEntity player in playerEntities)
        {
            player.hasMoved = true;
            player.hasAttacked = true;
        }
        UpdateTurns();
    }
}