using System;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class BattleMenu : MonoBehaviour
{
    private class Player
    {
        public int Health;
        public int Damage;

        public Action UpdateHealth;
    }

    private Player _user;
    private Player _enemy;
    private EnemyAi _enemyLogic;
    private readonly List<Action> _turnOrder = new List<Action>();
    private int _currentTurnIndex = 0;
    
    public Button attackButton;
    public Text userHealth;
    public Text enemyHealth;
    
    private void Awake()
    {
        _user = new Player {Health = 10, Damage = 1, UpdateHealth = UpdateUserHealth};
        _enemy = new Player {Health = 10, Damage = 1, UpdateHealth = UpdateEnemyHealth};
        _enemyLogic = new EnemyAi();
        _enemyLogic.AttackCallback += EnemyAttack;
    }
    
    private void Start()
    {
        attackButton.onClick.AddListener(PlayerAttack);
        
        _turnOrder.Add(UserTakeTurn);
        _turnOrder.Add(_enemyLogic.TakeTurn);

        _turnOrder[_currentTurnIndex]();
        
        UpdateUserHealth();
        UpdateEnemyHealth();
    }

    private void UpdateUserHealth()
    {
        userHealth.text = $"Health: {_user.Health}";
    }

    private void UpdateEnemyHealth()
    {
        enemyHealth.text = $"Health: {_enemy.Health}";
    }
    
    private void FinishTurn()
    {
        _currentTurnIndex = ++_currentTurnIndex % _turnOrder.Count;
        _turnOrder[_currentTurnIndex]();
    }
    
    private void PlayerAttack()
    {
        Attack(_user, _enemy);
        // TODO: disable hud
        attackButton.interactable = false;
        FinishTurn();
    }

    private void EnemyAttack()
    {
        Attack(_enemy, _user);
        FinishTurn();
    }

    private void UserTakeTurn()
    {
        // TODO: enable hud.
        attackButton.interactable = true;
    }

    private void Attack(Player attacker, Player victim)
    {
        victim.Health -= attacker.Damage;
        victim.UpdateHealth();
        if (victim.Health <= 0)
        {
            Debug.Log("The victim died!");
        }
    }
}