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

  scenes.push({
    id: "low-g-terraces",
    name: "Low-G terraces",
    config: {
      gravity: 0.65,
      spawnIntervalMs: 600,
      minChain: 3,
      palette: ["#fb7185", "#fbbf24", "#34d399", "#38bdf8"],
      ballRadius: 22,
      winCondition: {
        type: "score",
        target: 50000,
        onWin: { shoveBalls: true },
      },
      link: {
        stiffness: 0.6,
        lengthScale: 1,
        damping: 0.01,
        lineWidth: 4,
        rope: false,
        renderType: "spring",
        maxLengthMultiplier: 4.7,
      },
    },
    createBodies: (w, h) => {
      const floorHeight = Math.max(70, h * 0.12);
      const wallThickness = Math.max(32, w * 0.05);
      const wallHeight = h * 1.8;
      const cogRadius = Math.max(40, Math.min(w, h) * 0.085);
      const cogRadiusSmall = Math.max(30, Math.min(w, h) * 0.065);
      const bumperRadius = Math.max(20, Math.min(w, h) * 0.05);
      const stickyWidth = Math.max(90, w * 0.12);
      const stickyHeight = Math.max(14, h * 0.02);
      const stickyAmplitude = w * 0.06;
      const bumperAmplitude = h * 0.08;

      const makeGear = (cx, cy, outerRadius, teeth, color, rotSpeed) => {
        const coreRadius = outerRadius * 1.5;
        const toothLength = outerRadius * 0.5;
        const toothWidth = Math.max(outerRadius * 0.14, 10);
        const parts = [
          Bodies.circle(cx, cy, coreRadius, {
            isStatic: true,
            render: { fillStyle: color, strokeStyle: color },
          }),
        ];
        const step = (Math.PI * 2) / teeth;
        for (let i = 0; i < teeth; i += 1) {
          const angle = step * i;
          const tx = cx + Math.cos(angle) * (coreRadius + toothLength / 2);
          const ty = cy + Math.sin(angle) * (coreRadius + toothLength / 2);
          parts.push(
            Bodies.rectangle(tx, ty, toothWidth, toothLength, {
              isStatic: true,
              angle,
              render: { fillStyle: color, strokeStyle: color },
            }),
          );
        }
        const gear = Body.create({
          isStatic: true,
          parts,
          plugin: { rotSpeed },
        });
        return gear;
      };

      return [
        Bodies.rectangle(
          w / 2,
          h + floorHeight / 2,
          w + wallThickness * 2,
          floorHeight,
          {
            isStatic: true,
            restitution: 0.9,
            render: { fillStyle: "#0ea5e9", strokeStyle: "#0ea5e9" },
          },
        ),
        Bodies.rectangle(-wallThickness / 2, h / 2, wallThickness, wallHeight, {
          isStatic: true,
          render: { fillStyle: "#7c3aed", strokeStyle: "#7c3aed" },
        }),
        Bodies.rectangle(
          w + wallThickness / 2,
          h / 2,
          wallThickness,
          wallHeight,
          {
            isStatic: true,
            render: { fillStyle: "#7c3aed", strokeStyle: "#7c3aed" },
          },
        ),
        // Rotating cogs with teeth
        makeGear(w * 0.32, h * 0.38, cogRadius, 10, "#f97316", 1.2),
        makeGear(w * 0.64, h * 0.5, cogRadiusSmall, 12, "#a855f7", -1.6),
        makeGear(w * 0.5, h * 0.32, cogRadius * 0.85, 14, "#fb7185", 1.9),
        // Oscillating bumpers
        Bodies.circle(w * 0.2, h * 0.46, bumperRadius, {
          isStatic: true,
          restitution: 1.08,
          friction: 0.01,
          render: { fillStyle: "#14b8a6", strokeStyle: "#14b8a6" },
          plugin: {
            oscillate: { axis: "y", amplitude: bumperAmplitude, speed: 1.4 },
          },
        }),
        Bodies.circle(w * 0.5, h * 0.62, bumperRadius * 0.9, {
          isStatic: true,
          restitution: 1.08,
          friction: 0.01,
          render: { fillStyle: "#fbbf24", strokeStyle: "#fbbf24" },
          plugin: {
            oscillate: { axis: "x", amplitude: stickyAmplitude, speed: 1.1 },
          },
        }),
        Bodies.circle(w * 0.8, h * 0.38, bumperRadius * 1.05, {
          isStatic: true,
          restitution: 1.08,
          friction: 0.01,
          render: { fillStyle: "#38bdf8", strokeStyle: "#38bdf8" },
          plugin: {
            oscillate: {
              axis: "y",
              amplitude: bumperAmplitude * 0.7,
              speed: 1.8,
            },
          },
        }),
        // Sticky moving pads
        Bodies.rectangle(w * 0.32, h * 0.72, stickyWidth, stickyHeight, {
          isStatic: true,
          angle: -0.08,
          friction: 1.3,
          render: { fillStyle: "#0ea5e9", strokeStyle: "#0ea5e9" },
          plugin: {
            oscillate: { axis: "x", amplitude: stickyAmplitude, speed: 0.9 },
          },
        }),
        Bodies.rectangle(w * 0.72, h * 0.7, stickyWidth * 0.9, stickyHeight, {
          isStatic: true,
          angle: 0.06,
          friction: 1.3,
          render: { fillStyle: "#f472b6", strokeStyle: "#f472b6" },
          plugin: {
            oscillate: {
              axis: "x",
              amplitude: stickyAmplitude * 0.8,
              speed: 1.3,
            },
          },
        }),
        // Random polygon obstacles
        Bodies.polygon(w * 0.18, h * 0.28, 5, bumperRadius * 0.9, {
          isStatic: true,
          angle: 0.2,
          render: { fillStyle: "#22c55e", strokeStyle: "#22c55e" },
          plugin: { rotSpeed: -0.6 },
        }),
        Bodies.polygon(w * 0.86, h * 0.62, 7, bumperRadius * 0.95, {
          isStatic: true,
          angle: -0.25,
          render: { fillStyle: "#c084fc", strokeStyle: "#c084fc" },
          plugin: { rotSpeed: 0.9 },
        }),
      ];
    },
  });
})();