// EnemyBase.cs

using System.Collections;
using UnityEngine;
using UnityEngine.AI;

[RequireComponent(typeof(NavMeshAgent))]
[RequireComponent(typeof(HealthManager))]
public abstract class EnemyBase : MonoBehaviour , IFreezable
{
    public EnemyConfig config;
    [Header("Targeting")]
    public Transform target;            // assign player at runtime or via tag lookup
    public string playerTag = "Player"; // optional: auto-find

    protected NavMeshAgent agent;
    protected HealthManager health;
    protected float lastAttackTime = -999f;
    protected bool hasAggro;
    public bool isFrozen { get; set; }
    Coroutine _freezeCo;
    float _origSpeed, _origAccel, _origAngSpeed;
    protected virtual void Awake()
    {
        agent  = GetComponent<NavMeshAgent>();
        health = GetComponent<HealthManager>();
    }

    protected virtual void Start()
    {
        if (!target && !string.IsNullOrEmpty(playerTag))
        {
            var go = GameObject.FindGameObjectWithTag(playerTag);
            if (go) target = go.transform;
        }
        ApplyConfig();
        _origSpeed     = agent.speed;
        _origAccel     = agent.acceleration;
        _origAngSpeed  = agent.angularSpeed;
    }

    protected virtual void Update()
    {
        if (!target || health.IsDead()) { Idle(); return; }

        float dist = Vector3.Distance(transform.position, target.position);
        if (!hasAggro)
        {
            if (dist <= config.aggroRange) hasAggro = true;
            else { Idle(); return; }
        }
        else // has aggro
        {
            if (dist >= config.loseAggroRange)
            {
                hasAggro = false;
                Idle();
                return;
            }
        }

        // move / attack
        if (dist > config.attackRange)
        {
            Chase();
        }
        else
        {
            FaceTarget();
            TryAttack();
        }
    }

    protected virtual void Idle()
    {
        if (agent && agent.enabled)
        {
            agent.isStopped = true;
            agent.ResetPath();
        }
    }

    protected virtual void Chase()
    {
        if (!agent || !agent.enabled) return;
        agent.isStopped = false;
        agent.stoppingDistance = config.stoppingDistance;
        agent.SetDestination(target.position);
    }

    protected void FaceTarget()
    {
        Vector3 to = target.position - transform.position;
        to.y = 0f;
        if (to.sqrMagnitude > 0.001f)
        {
            var look = Quaternion.LookRotation(to);
            transform.rotation = Quaternion.RotateTowards(transform.rotation, look, config.angularSpeed * Time.deltaTime);
        }
    }

    protected void ApplyConfig()
    {
        if (!agent || config == null) return;
        agent.speed = config.moveSpeed;
        agent.angularSpeed = config.angularSpeed;
        agent.acceleration = config.accel;
        agent.stoppingDistance = config.stoppingDistance;
    }

    // ====== Attacking (implemented in child classes) ======
    protected abstract void TryAttack();

    // ====== IDamageable (forward to HealthManager) ======
    public void ApplyDamage(float amount) => health.TakeDamage(amount);
    public bool IsDead() => health.IsDead();

    // Handy debug
    [ContextMenu("Debug/Take 10")]
    void DebugHit() => ApplyDamage(10);

   
    public void Freeze(float duration)
    {
        if (_freezeCo != null) StopCoroutine(_freezeCo);
        _freezeCo = StartCoroutine(FreezeRoutine(duration));
    }

    IEnumerator FreezeRoutine(float duration)
    {
        // Enter freeze
        if (!isFrozen) EnterFreeze();

        // Wait for duration
        float t = duration;
        while (t > 0f)
        {
            t -= Time.deltaTime;
            yield return null;
        }

        // Exit
        ExitFreeze();
        _freezeCo = null;
    }
    
    void EnterFreeze()
    {
        isFrozen = true;

        // Stop movement immediately
        if (agent)
        {
            agent.isStopped = true;       // halts pathfinding updates
            agent.ResetPath();            // clear current path
            agent.velocity = Vector3.zero;

            // Optional: zero out movement-related params to avoid jitter
            agent.speed = 0f;
            agent.acceleration = 0f;
            agent.angularSpeed = 0f;
        }

    }
    
    void ExitFreeze()
    {
        isFrozen = false;

        if (agent)
        {
            // Restore movement settings
            agent.speed         = _origSpeed;
            agent.acceleration  = _origAccel;
            agent.angularSpeed  = _origAngSpeed;
            agent.isStopped     = false;
        }
        
    }
}