using System;

using Colosseum;
using Colosseum.Combat;
using Colosseum.Enemy;
using Colosseum.Player;

using Unity.Behavior;
using Unity.Properties;
using UnityEngine;

using Action = Unity.Behavior.Action;

/// <summary>
/// 일정 반경 내에서 가장 가까운 다운 대상 플레이어를 선택하는 Behavior Action입니다.
/// </summary>
[Serializable, GeneratePropertyBag]
[NodeDescription(
    name: "Select Nearest Downed Target",
    story: "[SearchRadius] 반경 내 가장 가까운 다운 대상을 [Target]으로 선택",
    category: "Action",
    id: "ee1146ad46ec4730acb4d6c883a5a771")]
public partial class SelectNearestDownedTargetAction : Action
{
    [SerializeReference]
    public BlackboardVariable<GameObject> Target;

    [SerializeReference]
    public BlackboardVariable<float> SearchRadius = new BlackboardVariable<float>(0f);

    protected override Status OnStart()
    {
        float searchRadius = ResolveSearchRadius();
        HitReactionController[] hitReactionControllers = UnityEngine.Object.FindObjectsByType<HitReactionController>(FindObjectsSortMode.None);

        GameObject nearestTarget = null;
        float nearestDistance = float.MaxValue;

        for (int i = 0; i < hitReactionControllers.Length; i++)
        {
            HitReactionController controller = hitReactionControllers[i];
            if (controller == null || !controller.IsDowned)
                continue;

            GameObject candidate = controller.gameObject;
            if (candidate == null || !candidate.activeInHierarchy)
                continue;

            if (Team.IsSameTeam(GameObject, candidate))
                continue;

            IDamageable damageable = candidate.GetComponent<IDamageable>();
            if (damageable != null && damageable.IsDead)
                continue;

            float distance = TargetSurfaceUtility.GetHorizontalSurfaceDistance(GameObject.transform.position, candidate);
            if (distance > searchRadius || distance >= nearestDistance)
                continue;

            nearestDistance = distance;
            nearestTarget = candidate;
        }

        if (nearestTarget == null)
            return Status.Failure;

        Target.Value = nearestTarget;
        GameObject.GetComponent<BossBehaviorRuntimeState>()?.SetCurrentTarget(nearestTarget);
        LogDebug($"다운 대상 선택: {nearestTarget.name}");
        return Status.Success;
    }

    private float ResolveSearchRadius()
    {
        return Mathf.Max(0f, SearchRadius.Value);
    }

    private void LogDebug(string message)
    {
        BossBehaviorRuntimeState context = GameObject.GetComponent<BossBehaviorRuntimeState>();
        context?.LogDebug(nameof(SelectNearestDownedTargetAction), message);
    }
}