package uno.mloluyu.characters.effects;

import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
import com.badlogic.gdx.math.MathUtils;

/** 单个命中粒子：简单方块/短线喷射，带速度、重力与淡出。 */
public class HitParticle {
    private float x, y;
    private float vx, vy;
    private float life; // 剩余寿命
    private final float totalLife;
    private final float size;
    private final Color color = new Color();
    private static final float GRAVITY = 900f; // 轻微下坠

    public HitParticle(float x, float y, Color base, float speedMin, float speedMax, float lifeMin, float lifeMax,
            float sizeMin, float sizeMax) {
        this.x = x;
        this.y = y;
        float ang = MathUtils.random(15f, 165f) * MathUtils.degreesToRadians; // 向上扇形
        float spd = MathUtils.random(speedMin, speedMax);
        this.vx = MathUtils.cos(ang) * spd;
        this.vy = MathUtils.sin(ang) * spd;
        this.life = MathUtils.random(lifeMin, lifeMax);
        this.totalLife = life;
        this.size = MathUtils.random(sizeMin, sizeMax);
        // 基础色随机稍许扰动
        float tint = MathUtils.random(0.85f, 1.05f);
        this.color.set(base.r * tint, base.g * tint, base.b * tint, 1f);
    }

    public boolean isAlive() {
        return life > 0f;
    }

    public void update(float dt) {
        if (!isAlive())
            return;
        life -= dt;
        // 运动积分
        x += vx * dt;
        y += vy * dt;
        vy -= GRAVITY * dt * 0.35f; // 轻微重力
    }

    public void render(ShapeRenderer sr) {
        if (!isAlive())
            return;
        float a = (life / totalLife); // 线性淡出
        sr.setColor(color.r, color.g, color.b, a);
        sr.rect(x - size / 2f, y - size / 2f, size, size);
    }
}