(() => {
  const { Bodies } = Matter;
  const scenes = (window.PhysilinksSceneDefs =
    window.PhysilinksSceneDefs || []);

  scenes.push({
    id: "swirl-arena",
    name: "Swirl Arena",
    config: {
      gravity: 0,
      gravityScale: 0.0007,
      timeScale: 0.9,
      spawnIntervalMs: 520,
      initialSpawnCount: 90,
      spawnLimit: 300,
      autoSpawn: true,
      minChain: 3,
      palette: ["#f472b6", "#22c55e"],
      ballRadius: 20,
      spawnOrigin: "center",
      spawnJitter: 120,
      blobBalls: false,
      noGameOver: true,
      winCondition: {
        type: "colorClear",
        targets: [{ color: "#22c55e", count: 100 }],
        onWin: { shoveBalls: true },
      },
      negativeScoreColors: ["#f472b6"],
      negativeProgressColors: ["#f472b6"],
      link: {
        stiffness: 0.82,
        lengthScale: 1.08,
        damping: 0.06,
        lineWidth: 3,
        rope: true,
        renderType: "line",
        maxLengthMultiplier: 3.6,
      },
      onBeforeUpdate: ({ engine }) => {
        const t = (engine.timing?.timestamp || 0) * 0.0005;
        engine.gravity.x = Math.cos(t);
        engine.gravity.y = Math.sin(t);
      },
    },
    createBodies: (w, h) => {
      const wallThickness = Math.max(36, Math.min(w, h) * 0.05);
      const innerW = w - wallThickness * 2;
      const innerH = h - wallThickness * 2;
      const cx = w / 2;
      const cy = h / 2;
      const wallOptions = {
        isStatic: true,
        restitution: 0.3,
        render: { fillStyle: "#0b1222", strokeStyle: "#0b1222" },
      };
      return [
        Bodies.rectangle(
          cx,
          cy - innerH / 2 - wallThickness / 2,
          innerW + wallThickness * 2,
          wallThickness,
          wallOptions,
        ),
        Bodies.rectangle(
          cx,
          cy + innerH / 2 + wallThickness / 2,
          innerW + wallThickness * 2,
          wallThickness,
          wallOptions,
        ),
        Bodies.rectangle(
          cx - innerW / 2 - wallThickness / 2,
          cy,
          wallThickness,
          innerH + wallThickness * 2,
          wallOptions,
        ),
        Bodies.rectangle(
          cx + innerW / 2 + wallThickness / 2,
          cy,
          wallThickness,
          innerH + wallThickness * 2,
          wallOptions,
        ),
      ];
    },
  });
})();