using UnityEngine;
using BaseGames.Core.Events;

namespace BaseGames.Enemies
{
    /// <summary>
    /// Boss 敌人基类。扩展 <see cref="EnemyBase"/> 以支持多阶段切换与战斗结束广播。
    /// 具体 Boss 继承此类并重写 <see cref="EnterPhase"/>。
    /// </summary>
    public class BossBase : EnemyBase
    {
        [Header("Boss 配置")]
        [SerializeField] private string                    _bossId;
        [SerializeField] private BoolEventChannelSO        _onBossFightEnded;
        [SerializeField] private BossPhaseEventChannelSO   _onBossPhaseChanged;

        public string BossId => _bossId;

        protected int _currentPhase = 0;

        /// <summary>
        /// 进入指定阶段。广播 <see cref="BossPhaseEvent"/> 供 UI / 音乐系统响应。
        /// 子类可重写以添加额外过渡逻辑（动画、无敌帧等）。
        /// </summary>
        public virtual void EnterPhase(int phase)
        {
            _currentPhase = phase;
            _onBossPhaseChanged?.Raise(new BossPhaseEvent
            {
                BossId = _bossId,
                Phase  = phase,
            });
        }

        /// <summary>检查当前 HP 是否低于指定百分比（0~1）。</summary>
        public bool IsHPBelow(float ratio)
        {
            if (_stats == null || _stats.MaxHP <= 0) return false;
            return (float)_stats.CurrentHP / _stats.MaxHP < ratio;
        }

        protected override void Die()
        {
            base.Die();
            _onBossFightEnded?.Raise(true);
        }
    }
}