namespace BaseGames.Combat.StatusEffects
{
    /// <summary>
    /// 中毒效果（架构 06_CombatModule §11）。
    /// 规则：最多叠加 3 层；每层叠加伤害 +1；每 1 秒造成 StackCount 点 True 伤害。
    /// </summary>
    public class PoisonEffect : StatusEffect
    {
        private const float BaseDuration = 5.0f;  // 持续 5 秒
        private const float DotInterval  = 1.0f;  // 每 1 秒一次

        public override StatusEffectType EffectType => StatusEffectType.Poison;
        public override int              MaxStacks   => 3;

        public PoisonEffect()
        {
            TickInterval = DotInterval;
        }

        public override void OnApply(StatusEffectManager owner)
        {
            base.OnApply(owner);
            UpdateShader();
        }

        public override void OnStack()
        {
            base.OnStack();
            UpdateShader();
        }

        public override void OnTick()
        {
            var info = new DamageInfo.Builder()
                .SetRaw(StackCount)          // 叠层越多伤害越高
                .SetType(DamageType.True)
                .SetFlags(DamageFlags.IgnoreIFrame)
                .Build();
            Owner?.ApplyDirectDamage(info);
        }

        public override void OnExpire()
        {
            StackCount = 0;
            Owner?.SetShaderParam("_PoisonGlow", 0f);
        }

        private void UpdateShader()
            => Owner?.SetShaderParam("_PoisonGlow", StackCount / (float)MaxStacks);

        protected override float GetBaseDuration() => BaseDuration;
        public override  string  GetDisplayName()  => $"中毒 ×{StackCount}";
    }
}