overrun/js/entities/enemies/BomberEnemy.js

import { BaseEnemy } from './BaseEnemy.js';

const EXPLODE_RADIUS      = 180;  // px — triggers proximity explosion
const PROXIMITY_SHARD_PX  = 250;  // travel distance for proximity explosion
const DEATH_SHARD_PX      = 200;  // travel distance for on-death explosion
const SHARD_COUNT         = 8;
const SHARD_SPEED         = 360;  // px/s baseline (overridden per explosion type)
const SHARD_DAMAGE     = 15;
const SHARD_DURATION   = 700;  // ms until shards disappear
const SHARD_HIT_RADIUS = 18;   // px — how close a shard must be to damage player
const TICK_MS          = 16;

export class BomberEnemy extends BaseEnemy {
  constructor(scene, x, y, player) {
    super(scene, x, y, player, {
      frameOffset: 12,
      radius: 10,
      hp: 20,
      speed: 130,
      xp: 20,
      contactDamage: 5, // low — explosion is the main attack
    });
    this._offsetAngle = Math.random() * Math.PI * 2;
    this._wobble      = 0.3 + Math.random() * 0.4;
    this._exploded    = false;
    this._deathSound  = 'sfx-death-bomber';
  }

  update(delta) {
    super.update(delta);
    if (this._dying) return;

    // Swarm-like wobble movement
    const t         = this.scene.time.now * 0.001;
    const baseAngle = Phaser.Math.Angle.Between(this.x, this.y, this.player.x, this.player.y);
    const angle     = baseAngle + Math.sin(t * 4 + this._offsetAngle) * this._wobble;
    this.sprite.body.setVelocity(Math.cos(angle) * this.speed, Math.sin(angle) * this.speed);

    // Proximity check — explode when close enough
    const dist = Phaser.Math.Distance.Between(this.x, this.y, this.player.x, this.player.y);
    if (dist < EXPLODE_RADIUS) {
      this._triggerExplosion();
    }
  }

  _triggerExplosion() {
    if (this._dying) return;
    this._exploded = true;
    this._spawnShards(PROXIMITY_SHARD_PX);
    this._die();
  }

  // Override _die so a bullet-killed Bomber still explodes (smaller radius).
  _die() {
    if (!this._exploded) {
      this._exploded = true;
      this._spawnShards(DEATH_SHARD_PX);
    }
    super._die();
  }

  _spawnShards(travelPx) {
    const shardSpeed = travelPx / (SHARD_DURATION / 1000);
    const scene   = this.scene;
    const ox      = this.x;
    const oy      = this.y;
    const player  = this.player;
    const barriers = scene.barrierManager;

    // Burst flash at explosion center
    const flash = scene.add.circle(ox, oy, 36, 0xff6600, 0.9).setDepth(25);
    scene.tweens.add({
      targets: flash, alpha: 0, scaleX: 2.5, scaleY: 2.5,
      duration: 320, onComplete: () => flash.destroy(),
    });
    const ring = scene.add.circle(ox, oy, 42, 0xffaa00, 0).setDepth(25)
      .setStrokeStyle(3, 0xffaa00, 0.9);
    scene.tweens.add({
      targets: ring, scaleX: 2.2, scaleY: 2.2, alpha: 0,
      duration: 400, onComplete: () => ring.destroy(),
    });

    scene.cameras.main.shake(180, 0.01);

    // Build shards: each is a Phaser Triangle game object
    const shards = [];
    for (let i = 0; i < SHARD_COUNT; i++) {
      const angle = (i / SHARD_COUNT) * Math.PI * 2;
      // Triangle pointing "up" in local space: tip at top, base at bottom
      const tri = scene.add.triangle(
        ox, oy,
        0, -10,   // tip
        7,  7,    // base-right
        -7,  7,   // base-left
        0xff4400,
      ).setDepth(22).setRotation(angle); // rotate to face travel direction

      // Add a neon outline
      tri.setStrokeStyle(1, 0xffaa00);

      shards.push({
        obj: tri,
        vx:  Math.cos(angle) * shardSpeed,
        vy:  Math.sin(angle) * shardSpeed,
        rotSpeed: (Math.random() > 0.5 ? 1 : -1) * (6 + Math.random() * 6), // rad/s
        alive: true,
      });
    }

    // Manual update loop — avoids tween onComplete reliability issues
    let elapsed = 0;
    const playerDamaged = new Set();

    const ticker = scene.time.addEvent({
      delay: TICK_MS,
      repeat: Math.ceil(SHARD_DURATION / TICK_MS),
      callback: () => {
        elapsed += TICK_MS;
        const dt = TICK_MS / 1000;
        const fade = Math.max(0, 1 - elapsed / SHARD_DURATION);

        for (const shard of shards) {
          if (!shard.alive) continue;

          shard.obj.x += shard.vx * dt;
          shard.obj.y += shard.vy * dt;
          shard.obj.rotation += shard.rotSpeed * dt;
          shard.obj.alpha = 0.4 + fade * 0.6;

          // Player hit
          if (!playerDamaged.has(shard)) {
            const d = Phaser.Math.Distance.Between(shard.obj.x, shard.obj.y, player.x, player.y);
            if (d < SHARD_HIT_RADIUS + 16) {
              player.takeDamage(SHARD_DAMAGE);
              playerDamaged.add(shard);
              shard.alive = false;
              shard.obj.destroy();
              continue;
            }
          }

          // Interior barrier hit
          if (barriers?.destroyInteriorBarrierAt(shard.obj.x, shard.obj.y)) {
            shard.alive = false;
            shard.obj.destroy();
            continue;
          }
        }

        if (elapsed >= SHARD_DURATION) {
          shards.forEach(s => { if (s.alive) s.obj.destroy(); });
          ticker.remove();
        }
      },
    });
  }
}