using BigFloatNumerics;
using System;
using UnityEngine;

[Serializable]
public class EnemyAttack : State<Character>
{
    StatData attackStat;
    BigFloat attack => attackStat != null ? attackStat.Value : 0;

    StatData attackSpeedPerSec;
    float attackSpeed => attackSpeedPerSec != null ? attackSpeedPerSec.Value : 1f;

    float backupAnimationSpeed;

    public IBattleEntity Target { get; set; }

    protected override void OnInitialize()
    {
        Owner.Excutor.Data.TryGetStat(StatID.Attack, out attackStat);
        Owner.Excutor.Data.TryGetStat(StatID.AttackSpeedPerSec, out attackSpeedPerSec);

        Debug.Assert(Owner.Excutor.SkeletonAnimation.TryGetAnimation("attack", out Spine.Animation _), "attack animation not exist");
    }

    public override void Enter()
    {
        backupAnimationSpeed = Owner.Excutor.SkeletonAnimation.timeScale;
        Owner.Excutor.SkeletonAnimation.timeScale = attackSpeed;

        Owner.Excutor.SkeletonAnimation.AnimationState.SetAnimation(0, "attack", false);
        Owner.Excutor.SkeletonAnimation.AnimationState.Event += OnAttackEvent;

        Owner.Excutor.ChangeLookDirection((Target as Entity).transform);
    }

    public override void Excute()
    {
        var trackEntry = Owner.Excutor.SkeletonAnimation.AnimationState.GetCurrent(0);
        if (trackEntry is null || trackEntry.IsComplete)
            Owner.ChangeState<EnemyIdle>();
    }

    public override void Exit()
    {
        Owner.Excutor.SkeletonAnimation.AnimationState.Event -= OnAttackEvent;
        Owner.Excutor.SkeletonAnimation.timeScale = backupAnimationSpeed;
    }

    private void OnAttackEvent(Spine.TrackEntry trackEntry, Spine.Event e)
    {
        if (e.Data.Name != "attack" || Target is null || !Target.IsBattleAvail()) return;

        BattleMgr.Instance.SendDamage(Target, attack, 0, 0);
    }
}