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

public class BattleMenu : MonoBehaviour
{ 
    private EnemyAi _enemyLogic;
    private readonly List<Player> _players = new List<Player>();
    private int _currentPlayerIndex;

    private Player CurrentPlayer => _players[_currentPlayerIndex];
    
    public Button attackButton;
    public Button bloodCounterButton;
    public Button counterButton;
    public Button defendButton;
    public Text userHealth;
    public Text enemyHealth;
    
    private void Awake()
    {
        _players.Add(new Player {health = 100, damage = 5, updateHealth = UpdateUserHealth, isHumanControlled = true});
        _players.Add(new Player {health = 100, damage = 5, updateHealth = UpdateEnemyHealth, isHumanControlled = false});
        
        _enemyLogic = new EnemyAi();
        _enemyLogic.attackCallback += Attack;
        _enemyLogic.defendCallback += Defend;
        _enemyLogic.counterCallback += Counter;
    }
    
    private void Start()
    {
        attackButton.onClick.AddListener(Attack);
        bloodCounterButton.onClick.AddListener(BloodCounter);
        defendButton.onClick.AddListener(Defend);
        counterButton.onClick.AddListener(Counter);

        foreach (var player in _players)
        {
            player.updateHealth(player.health);
        }
        
        Debug.Log(CurrentPlayer.isHumanControlled ? "Start user turn" : "Start enemy turn");
        StartTurn();
    }

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

    private void UpdateEnemyHealth(int health)
    {
        enemyHealth.text = $"Health: {health}";
    }

    private void FinishTurn()
    {
        // TODO: disable hud
        attackButton.interactable = !CurrentPlayer.isHumanControlled;
        bloodCounterButton.interactable = !CurrentPlayer.isHumanControlled;
        defendButton.interactable = !CurrentPlayer.isHumanControlled;
        counterButton.interactable = !CurrentPlayer.isHumanControlled;
        
        _currentPlayerIndex = ++_currentPlayerIndex % _players.Count;
        StartTurn();
    }

    private void Attack()
    {
        // TODO: when target selection is a thing this will need to be changed.
        var victimIndex = (_currentPlayerIndex + 1) % _players.Count;
        Attack(CurrentPlayer, _players[victimIndex]);
        FinishTurn();
    }

    private void BloodCounter()
    {
        CurrentPlayer.isBloodCounter = true;
        FinishTurn();
    }

    private void Defend()
    {
        CurrentPlayer.damageReduction = 0.4f;
        CurrentPlayer.startTurnEffects = ResetDamageReduction;
        FinishTurn();
    }

    private void Counter()
    {
        CurrentPlayer.isCounter = true;
        FinishTurn();
    }

    private void StartTurn()
    {
        CurrentPlayer.isCounter = false;
        if (CurrentPlayer.isStunned)
        {
            Debug.Log("stunned, skipping turn");
            CurrentPlayer.isStunned = false;
            FinishTurn();
            return;
        }
        
        // TODO: enable hud.
        attackButton.interactable = CurrentPlayer.isHumanControlled;
        bloodCounterButton.interactable = CurrentPlayer.isHumanControlled;
        defendButton.interactable = CurrentPlayer.isHumanControlled;
        counterButton.interactable = CurrentPlayer.isHumanControlled;
        
        CurrentPlayer.startTurnEffects?.Invoke(CurrentPlayer);
        CurrentPlayer.startTurnEffects = null;
        
        // TODO: controller.
        if (!CurrentPlayer.isHumanControlled)
        {
            _enemyLogic.TakeTurn();
        }
    }

    private void ResetDamageReduction(Player p)
    {
        p.damageReduction = 1f;
    }

    private void Attack(Player attacker, Player victim)
    {
        if (victim.isCounter)
        {
            attacker.isStunned = true;
            Debug.Log("COUNTER");
            return;
        }
        victim.TakeDamage((int)(attacker.damage * attacker.damageModification));
        // damage mod is spent whenever they attack.
        attacker.damageModification = 1;
        attacker.isBloodCounter = false;
        if (victim.health <= 0)
        {
            Debug.Log("The victim died!");
        }
    }
}