using Platformer.Core;
using Platformer.Mechanics;
using Platformer.Model;
using UnityEngine;
using static Platformer.Core.Simulation;

namespace Platformer.Gameplay
{

    /// <summary>
    /// Fired when a Player collides with an Enemy.
    /// BT5-Dev 2단계 (2026-04-23): "위에서 밟기" 판정 폐기 → i-frame 체크 피격 로직.
    /// PD 지시 2026-05-07: 밟기 공격 복원. 위에서 밟으면 적 즉사 + Player Bounce.
    /// 측면·아래 충돌은 기존 i-frame 피격 로직 유지. 부활 직후 i-frame 동안에도 밟기는 가능.
    /// </summary>
    /// <typeparam name="EnemyCollision"></typeparam>
    public class PlayerEnemyCollision : Simulation.Event<PlayerEnemyCollision>
    {
        public EnemyController enemy;
        public PlayerController player;
        /// <summary>BT5-Dev #16 — EnemyController.Update에서 측정한 Player·Enemy y 차 (밟기 판정 영역).</summary>
        public float dyAtCollision;

        PlatformerModel model = Simulation.GetModel<PlatformerModel>();

        public override void Execute()
        {
            if (player == null || player.health == null || enemy == null) return;

            // BT5-Dev #16 — Distance 기반 밟기 판정. dyAtCollision > stompMinDy = Player가 Enemy 위에서 밟음.
            bool stomped = dyAtCollision > enemy.stompMinDy;

            Debug.Log($"[PEC] stomped={stomped} dy={dyAtCollision:F2} (threshold>{enemy.stompMinDy}) pInvuln={player.health.IsInvulnerable}");

            if (stomped)
            {
                Schedule<EnemyDeath>().enemy = enemy;
                player.Bounce(player.jumpTakeOffSpeed / 3f);
                return;
            }

            // 측면·아래 충돌 — i-frame 적용 피격
            if (player.health.IsInvulnerable) return;
            player.health.Decrement();
        }
    }
}