using System.Collections;
using UnityEngine;

[CreateAssetMenu(menuName = "Abilities/Channel Heal")]
public class ChannelHealAbility : Ability
{
    public GameObject healPrefab;
    public float channelTime = 5f;     // seconds to wait
    public float healAmount = 50f;     // how much to heal

    public override void Activate(AbilityUser user)
    {
        if (!user) return;
        user.StartCoroutine(ChannelRoutine(user));
    }

    private IEnumerator ChannelRoutine(AbilityUser user)
    {
        float elapsed = 0f;
        var go = Instantiate(healPrefab, user.CastPos(), Quaternion.LookRotation(user.Forward()));
        while (elapsed < channelTime)
        {
            // Cancel if player moves
            if (IsPlayerMoving())
            {
                Debug.Log("Heal cancelled: player moved.");
                Destroy(go);
                yield break;
            }

            elapsed += Time.deltaTime;
            yield return null;
        }

        // Heal and spend mana on completion
        if (user.mana && !user.mana.Spend(manaCost))
        {
            Debug.Log("Not enough mana to complete heal.");
            Destroy(go);
            yield break;
        }

        if (user.health) user.health.Heal(healAmount);
        Debug.Log($"Healed {healAmount} HP after channel.");
        Destroy(go);
    }

    private bool IsPlayerMoving()
    {
        float h = Input.GetAxisRaw("Horizontal");
        float v = Input.GetAxisRaw("Vertical");
        return (Mathf.Abs(h) > 0.01f || Mathf.Abs(v) > 0.01f);
    }
}