using System;
using UnityEngine;
using Quests;

[RequireComponent(typeof(CharacterStats))]
public class CombatController : MonoBehaviour
{
    [Header("Combat Feedback Prefabs (Optional)")]
    [SerializeField] private GameObject attackEffectPrefab;
    [SerializeField] private GameObject hitEffectPrefab;

    public CharacterStats Stats { get; private set; }
    public CharacterStats CurrentTarget { get; private set; }

    public event Action<CharacterStats> OnAttackExecuted;

    private float lastAttackTime = 0f;

    private void Awake()
    {
        Stats = GetComponent<CharacterStats>();
        Stats.onDeath.AddListener(OnSelfDeath);
    }

    public void SetTarget(CharacterStats target)
    {
        if (target == this.Stats || (target != null && target.IsDead))
        {
            ClearTarget();
            return;
        }

        CurrentTarget = target;
    }

    public void ClearTarget()
    {
        CurrentTarget = null;
    }

    public bool IsInAttackRange(CharacterStats target)
    {
        if (target == null) return false;

        Vector3 flatSelf = new Vector3(transform.position.x, 0, transform.position.z);
        Vector3 flatTarget = new Vector3(target.transform.position.x, 0, target.transform.position.z);

        float distance = Vector3.Distance(flatSelf, flatTarget);
        return distance <= Stats.AttackRange;
    }

    public bool CanAttack()
    {
        if (Stats.IsDead || CurrentTarget == null || CurrentTarget.IsDead) return false;
        if (!IsInAttackRange(CurrentTarget)) return false;

        float attackCooldown = 1.0f / Mathf.Max(Stats.AttackSpeed, 0.1f);
        return Time.time >= lastAttackTime + attackCooldown;
    }

    public bool TryExecuteAttack()
    {
        if (!CanAttack()) return false;

        lastAttackTime = Time.time;

        // Face target
        Vector3 dir = (CurrentTarget.transform.position - transform.position);
        dir.y = 0;
        if (dir != Vector3.zero)
        {
            transform.rotation = Quaternion.LookRotation(dir);
        }

        // Deal Damage
        float damage = Stats.BaseDamage;
        CurrentTarget.TakeDamage(damage, gameObject);

        // Visual effects
        if (attackEffectPrefab != null)
        {
            Instantiate(attackEffectPrefab, transform.position + transform.forward * 0.5f + Vector3.up, transform.rotation);
        }
        if (hitEffectPrefab != null && CurrentTarget != null)
        {
            Instantiate(hitEffectPrefab, CurrentTarget.transform.position + Vector3.up, Quaternion.identity);
        }

        OnAttackExecuted?.Invoke(CurrentTarget);

        // If target died from this attack
        if (CurrentTarget.IsDead)
        {
            // Report kill to Quest System if attacker is player
            if (gameObject.CompareTag("Player") && QuestManager.Instance != null)
            {
                QuestManager.Instance.ReportKill(CurrentTarget.CharacterName);
            }

            ClearTarget();
        }

        return true;
    }

    private void OnSelfDeath(GameObject killer)
    {
        ClearTarget();
    }
}