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

  const makeCurveSegments = (cx, h, amp, thickness, segments) => {
    const segs = [];
    const stepY = h / segments;
    let prevX = cx;
    let prevY = 0;
    for (let i = 0; i < segments; i += 1) {
      const y = stepY * (i + 1);
      const t = y / h;
      const x = cx + Math.sin(t * Math.PI * 1.5) * amp;
      const dx = x - prevX;
      const dy = y - prevY;
      const len = Math.max(1, Math.sqrt(dx * dx + dy * dy));
      const angle = Math.atan2(dy, dx);
      segs.push(
        Bodies.rectangle((prevX + x) / 2, (prevY + y) / 2, thickness, len, {
          isStatic: true,
          angle,
          render: { fillStyle: "#14213a", strokeStyle: "#14213a" },
          plugin: { curve: true },
        }),
      );
      prevX = x;
      prevY = y;
    }
    return segs;
  };

  scenes.push({
    id: "scene-lava",
    name: "Lava drift",
    config: {
      gravity: -0.1,
      spawnIntervalMs: 180,
      spawnFrom: "bottom",
      autoSpawn: true,
      minChain: 3,
      palette: ["#f472b6", "#38bdf8", "#fbbf24", "#a855f7", "#22c55e"],
      ballRadius: 26,
      blobBalls: true,
      winCondition: {
        type: "score",
        target: 25000,
        onWin: { setGravity: -0.55, removeCurves: true },
        nextSceneId: "scene-grid",
      },
      link: {
        stiffness: 0.7,
        lengthScale: 1.05,
        damping: 0.12,
        lineWidth: 3,
        rope: true,
        renderType: "line",
        maxLengthMultiplier: 4.8,
      },
    },
    createBodies: (w, h) => {
      const wallThickness = Math.max(24, w * 0.05);
      const amp = Math.max(40, w * 0.08);
      const segments = 12;
      const curves = [
        ...makeCurveSegments(w * 0.33, h, amp, wallThickness, segments),
        ...makeCurveSegments(w * 0.67, h, amp * 0.95, wallThickness, segments),
      ];

      // Gentle paddles that sway slightly
      /*
      const paddleWidth = Math.max(120, w * 0.18);
      const paddleHeight = Math.max(12, h * 0.018);
      const paddles = [
        Bodies.rectangle(w * 0.45, h * 0.65, paddleWidth, paddleHeight, {
          isStatic: true,
          angle: -0.08,
          render: { fillStyle: "#0ea5e9", strokeStyle: "#0ea5e9" },
          plugin: {
            oscillate: { axis: "x", amplitude: w * 0.05, speed: 0.7 },
          },
        }),
        Bodies.rectangle(w * 0.58, h * 0.4, paddleWidth * 0.85, paddleHeight, {
          isStatic: true,
          angle: 0.12,
          render: { fillStyle: "#f59e0b", strokeStyle: "#f59e0b" },
          plugin: {
            oscillate: { axis: "x", amplitude: w * 0.04, speed: 1.0 },
          },
        }),
      ];
      */

      return [...curves];
    },
  });
})();