const BULLET_SPEED = 700; // pixels/sec
const BULLET_LIFETIME = 1800; // ms

export default class Bullet {
    constructor(scene, x, y, angle, owner, group) {
        this.scene = scene;
        this.owner = owner; // 'player' or 'alien'
        this.alive = true;

        const textureKey = owner === 'player' ? 'bullet' : 'alien_bullet';
        this.sprite = scene.physics.add.sprite(x, y, textureKey);
        group.add(this.sprite);
        this.sprite.gameEntity = this;
        this.sprite.body.setAllowGravity(false);

        const rad = Phaser.Math.DegToRad(angle);
        this.sprite.setVelocity(
            Math.cos(rad) * BULLET_SPEED,
            Math.sin(rad) * BULLET_SPEED
        );

        this.createdAt = scene.time.now;
    }

    update(time) {
        if (!this.alive) return false;

        // Expire by lifetime
        if (time - this.createdAt > BULLET_LIFETIME) {
            this.destroy();
            return false;
        }

        // Expire if far off-screen
        const { x, y } = this.sprite;
        if (x < -60 || x > 1660 || y < -60 || y > 960) {
            this.destroy();
            return false;
        }

        return true;
    }

    destroy() {
        if (!this.alive) return;
        this.alive = false;
        if (this.sprite && this.sprite.active) {
            this.sprite.destroy();
        }
    }
}