using System;
using System.Collections.Generic;
using UnityEngine;

public class BezierBulletCurve : BulletCurve
{
    private Vector2 start;
    private Vector2 end;
    private Vector2 control;

    public BezierBulletCurve(BattleObject caster, SkillConfig skillConfig, BattleEffectPlayer effectPlayer,
        RectTransform target, HB427_tagSCUseSkill tagUseSkillAttack, int bulletIndex, Action<int, List<HB427_tagSCUseSkill.tagSCUseSkillHurt>> onHit)
        : base(caster, skillConfig, effectPlayer, target, tagUseSkillAttack, bulletIndex, onHit) { }

    public override void Reset()
    {
        base.Reset();
        start = WorldToLocalAnchoredPosition(bulletTrans.position);
        end = WorldToLocalAnchoredPosition(target.position);
        duration = Vector2.Distance(start, end) / skillConfig.BulletFlySpeed;
        control = (start + end) / 2 + Vector2.up * 100f;
    }

    public override void Run()
    {
        if (finished) return;
        elapsed += Time.deltaTime;
        float t = Mathf.Clamp01(elapsed / duration);
        Vector2 pos = Mathf.Pow(1 - t, 2) * start + 2 * (1 - t) * t * control + Mathf.Pow(t, 2) * end;
        bulletTrans.anchoredPosition = pos;

        Vector2 tangent = 2 * (1 - t) * (control - start) + 2 * t * (end - control);
        float angle = Mathf.Atan2(tangent.y, tangent.x) * Mathf.Rad2Deg - 90f;
        bulletTrans.localRotation = Quaternion.Euler(0, 0, angle);

        if (t >= 1f)
        {
            finished = true;
            onHit?.Invoke(mBulletIndex, hurts);
        }
    }
}