{
  "params": {
    "style": {
      "type": "choice",
      "options": [
        "hoops",
        "wave",
        "slots"
      ],
      "default": "hoops",
      "label": "Style",
      "describe": "hoops (inverted-U steel stands, two bikes lean on each), wave (one serpentine tube, bikes roll into the dips), slots (low ground frame that grips the front wheel)."
    },
    "spaces": {
      "type": "range",
      "min": 2,
      "max": 6,
      "step": 1,
      "default": 4,
      "label": "Spaces",
      "describe": "How many parking places the rack has, 2 to 6 (hoops 0.9 m apart, wave dips 0.75 m, slots 0.7 m)."
    },
    "bikes": {
      "type": "range",
      "min": 0,
      "max": 6,
      "step": 1,
      "default": 2,
      "label": "Bikes",
      "describe": "How many bicycles are parked, 0 (empty rack) to 6; capped at the number of spaces. Seeded spaces fill first."
    },
    "finish": {
      "type": "choice",
      "options": [
        "steel",
        "black",
        "green",
        "blue",
        "yellow"
      ],
      "default": "steel",
      "label": "Finish",
      "describe": "Rack finish: steel (galvanised), black, green, blue, yellow (high visibility)."
    },
    "seed": {
      "type": "range",
      "min": 1,
      "max": 99,
      "step": 1,
      "default": 2,
      "label": "Seed",
      "describe": "Which spaces are taken, the bike frame colours, and city bikes with baskets versus sport bikes with drop bars."
    }
  },
  "presets": {
    "busy campus": {
      "style": "hoops",
      "spaces": 6,
      "bikes": 6,
      "seed": 7
    },
    "empty wave": {
      "style": "wave",
      "spaces": 5,
      "bikes": 0,
      "finish": "yellow"
    },
    "shop front slots": {
      "style": "slots",
      "spaces": 5,
      "bikes": 2,
      "finish": "black"
    }
  },
  "night": null
}