using System;

using Colosseum.AI;
using Colosseum.Enemy;

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

/// <summary>
/// 지정된 패턴을 실행하는 범용 액션 노드입니다.
/// Pattern 필드에 BossPatternData 에셋을 직접 할당합니다.
/// 타겟 해석과 등록은 Condition에서 처리되므로, 이 액션은 순수하게 패턴만 실행합니다.
/// 시그니처 패턴은 내부적으로 TryStartSignaturePattern 경로를 사용합니다.
/// </summary>
[Serializable, GeneratePropertyBag]
[NodeDescription(
    name: "Use Pattern By Role",
    story: "[Pattern] 패턴 실행",
    category: "Action",
    id: "b2c3d4e5-1111-2222-3333-555566667777")]
public partial class UsePatternByRoleAction : BossPatternActionBase
{
    [SerializeReference]
    [Tooltip("실행할 패턴")]
    public BlackboardVariable<BossPatternData> Pattern;

    /// <summary>
    /// 시그니처 패턴 실행 상태 추적
    /// </summary>
    private bool signatureStarted;

    protected override Status OnStart()
    {
        BossPatternData pattern = Pattern?.Value;
        if (pattern == null)
            return Status.Failure;

        if (pattern.IsSignature)
            return StartSignaturePattern();

        // 타겟 해석은 ResolveStepTarget에서 처리됨
        // 여기서는 RegisterPatternUse만 호출 (근접 패턴 전용)
        if (pattern.IsMelee)
        {
            BossCombatBehaviorContext context = GameObject.GetComponent<BossCombatBehaviorContext>();
            context?.RegisterPatternUse(pattern);
        }

        // base.OnStart는 TryResolvePattern → ExecuteCurrentStep 호출
        return base.OnStart();
    }

    protected override Status OnUpdate()
    {
        BossPatternData pattern = Pattern?.Value;
        if (pattern == null)
            return Status.Failure;

        if (pattern.IsSignature)
            return UpdateSignaturePattern();

        return base.OnUpdate();
    }

    protected override void OnEnd()
    {
        if (signatureStarted)
        {
            signatureStarted = false;
            return;
        }

        base.OnEnd();
    }

    /// <summary>
    /// 시그니처 패턴 시작
    /// </summary>
    private Status StartSignaturePattern()
    {
        BossCombatBehaviorContext context = GameObject.GetComponent<BossCombatBehaviorContext>();
        if (context == null)
            return Status.Failure;

        GameObject target = Target != null ? Target.Value : null;
        signatureStarted = context.TryStartSignaturePattern(target);
        return signatureStarted ? Status.Running : Status.Failure;
    }

    /// <summary>
    /// 시그니처 패턴 업데이트
    /// </summary>
    private Status UpdateSignaturePattern()
    {
        if (!signatureStarted)
            return Status.Failure;

        BossCombatBehaviorContext context = GameObject.GetComponent<BossCombatBehaviorContext>();
        if (context == null)
            return Status.Failure;

        return context.IsSignaturePatternActive
            ? Status.Running
            : Status.Success;
    }

    /// <summary>
    /// BossPatternActionBase.TryResolvePattern 구현.
    /// Condition에서 이미 타겟을 해석했으므로, Target.Value를 그대로 사용합니다.
    /// </summary>
    protected override bool TryResolvePattern(out BossPatternData pattern, out GameObject target)
    {
        pattern = Pattern?.Value;
        target = Target != null ? Target.Value : null;

        if (pattern == null)
            return false;

        if (!UsePatternAction.IsPatternReady(GameObject, pattern))
            return false;

        if (target == null)
            return false;

        return true;
    }

    protected override GameObject ResolveStepTarget(GameObject fallbackTarget)
    {
        BossPatternData pattern = Pattern?.Value;
        if (pattern == null)
            return base.ResolveStepTarget(fallbackTarget);

        BossCombatBehaviorContext context = GameObject.GetComponent<BossCombatBehaviorContext>();
        if (context == null)
            return base.ResolveStepTarget(fallbackTarget);

        TargetResolveMode targetMode = pattern.TargetMode;

        if (targetMode == TargetResolveMode.Mobility)
            return context.IsValidMobilityTarget(fallbackTarget)
                ? fallbackTarget
                : context.FindMobilityTarget();

        if (targetMode == TargetResolveMode.Utility)
            return context.IsValidUtilityTarget(fallbackTarget)
                ? fallbackTarget
                : context.FindUtilityTarget();

        return base.ResolveStepTarget(fallbackTarget);
    }
}