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>
/// 보스의 주 대상을 갱신하는 공통 Behavior Action입니다.
/// </summary>
[Serializable, GeneratePropertyBag]
[NodeDescription(
    name: "Refresh Primary Target",
    story: "보스 주 대상을 [Target]으로 갱신",
    category: "Action",
    id: "b7dbb1fc0c0d451795e9f02d6f4d3930")]
public partial class RefreshPrimaryTargetAction : Action
{
    [SerializeReference]
    public BlackboardVariable<GameObject> Target;

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

    protected override Status OnStart()
    {
        BossBehaviorRuntimeState runtimeState = GameObject.GetComponent<BossBehaviorRuntimeState>();
        if (runtimeState != null && runtimeState.IsBehaviorSuppressed)
            return Status.Failure;

        EnemyBase enemyBase = GameObject.GetComponent<EnemyBase>();
        if (enemyBase == null)
            return Status.Failure;

        GameObject currentTarget = Target != null ? Target.Value : null;
        float searchRange = ResolveSearchRange(enemyBase);
        GameObject resolvedTarget = enemyBase.GetHighestThreatTarget(currentTarget, null, searchRange);

        if (resolvedTarget == null)
            resolvedTarget = FindNearestLivingTarget(enemyBase, currentTarget, searchRange);

        if (Target != null)
            Target.Value = resolvedTarget;

        runtimeState?.SetCurrentTarget(resolvedTarget);
        runtimeState?.LogDebug(nameof(RefreshPrimaryTargetAction), resolvedTarget != null
            ? $"주 대상 갱신: {resolvedTarget.name}"
            : "주 대상 갱신 실패");

        return resolvedTarget != null ? Status.Success : Status.Failure;
    }

    private float ResolveSearchRange(EnemyBase enemyBase)
    {
        if (SearchRange != null && SearchRange.Value > 0f)
            return SearchRange.Value;

        return enemyBase != null && enemyBase.Data != null ? enemyBase.Data.AggroRange : Mathf.Infinity;
    }

    private GameObject FindNearestLivingTarget(EnemyBase enemyBase, GameObject currentTarget, float searchRange)
    {
        PlayerNetworkController[] players = UnityEngine.Object.FindObjectsByType<PlayerNetworkController>(FindObjectsSortMode.None);
        GameObject nearestTarget = null;
        float nearestDistance = float.MaxValue;

        for (int i = 0; i < players.Length; i++)
        {
            PlayerNetworkController player = players[i];
            if (player == null || player.IsDead || !player.gameObject.activeInHierarchy)
                continue;

            GameObject candidate = player.gameObject;
            if (Team.IsSameTeam(GameObject, candidate))
                continue;

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

            nearestDistance = distance;
            nearestTarget = candidate;
        }

        return nearestTarget != null ? nearestTarget : currentTarget;
    }
}