SINK & FAUCET PLANNER — AI URL GUIDE

Tool: https://www.lejnel.com/tools/sink-faucet/
Query parameter: layout

LINK CREATION
Serialize the state as compact JSON and percent-encode it ONCE as the named query parameter. Do not use Base64. JavaScript: encodeURIComponent(JSON.stringify(state)); Python: urllib.parse.quote(json.dumps(state,separators=(',',':')),safe=''). Encode Unicode, &, #, +, % and other reserved characters. Return a clickable URL and summarize inputs and assumptions. Ask about missing inputs; do not invent measurements or product requirements. All JSON numbers must be finite, with decimal points and no unit suffixes.

SAVING
The complete URL stores the inputs, not a server-side account record. Open the link and check every input. Bookmark or copy the updated URL after edits to retain that version. Anyone with the link can read its contents; avoid personal data. Results are recalculated on reopening and may change with future tool improvements. Print a fixed record when necessary.

STATE EXAMPLE (illustrative only)
{
  "topWidth": 1200,
  "topDepth": 635,
  "sinkWidth": 600,
  "sinkDepth": 450,
  "sinkLeft": 300,
  "sinkRear": 150,
  "inset": 10,
  "base": 50,
  "hole": 35,
  "gap": 30,
  "offset": 0,
  "rearMin": 65,
  "reach": 200,
  "reference": "centre",
  "extras": [
    {
      "type": "soap",
      "x": 700,
      "y": 95,
      "base": 45,
      "hole": 25,
      "reach": 120,
      "rearMin": 0
    }
  ]
}

FIELDS AND LIMITATIONS
Every length is in MILLIMETRES, even when the user chooses imperial display. Convert inches × 25.4 and feet × 304.8 before generating the URL. The inputs below are required except extras (defaults to []).
topWidth, topDepth: countertop width left-to-right and depth back-to-front.
sinkWidth, sinkDepth: OUTSIDE sink rim dimensions, not bowl dimensions.
sinkLeft, sinkRear: position of outside sink left/back edges from countertop left/back.
inset: cutout inset on EACH side; must be less than half both sink dimensions. Use actual product template values.
base: main faucet visible base diameter. hole: main faucet mounting-hole diameter. These are NOT the same measurement.
gap: sink outside rear rim to nearest main faucet base edge.
offset: horizontal main faucet offset from sink centre; positive right, negative left.
rearMin: minimum rear clearance per product instructions.
reference: "centre" = clearance from back to mounting centre, "edge" = back to rear edge of base. The reference IKEA illustration uses 65 mm to the centre; do not apply this to other models without confirmation.
reach: HORIZONTAL mounting-centre to outlet-tip distance, not height or curved spout length. Legacy links missing reach use a 200 mm example; always specify it in new links.
extras: up to 5 objects. Each requires type ("soap", "hot", "faucet"), x (centre from left), y (centre from back), base (diameter), hole (diameter), reach and rearMin (back to centre requirement). 0 rearMin means unspecified, not a verified acceptable clearance.
All lengths are nonnegative except offset. Absolute values at most 6000. Countertop, sink, base and hole dimensions must be positive. Extra base/hole must also be positive. Do not invent fixture positions. Ask where each should sit.
Main faucet centre: x=sinkLeft+sinkWidth/2+offset; y=sinkRear-gap-base/2. Tip y=y+reach. All spouts point towards the front. Extra coordinates are absolute. The tool warns about overlaps, out-of-bounds fixtures and some clearance issues. Bowl opening is approximated by the rectangular cutout; handles, stream angle, mounting parts and cabinet structure are not modelled. The diagram is not a drilling template. Keep decoded state under 6000 characters.

READY-TO-OPEN EXAMPLE
https://www.lejnel.com/tools/sink-faucet/?layout=%7B%22topWidth%22%3A1200%2C%22topDepth%22%3A635%2C%22sinkWidth%22%3A600%2C%22sinkDepth%22%3A450%2C%22sinkLeft%22%3A300%2C%22sinkRear%22%3A150%2C%22inset%22%3A10%2C%22base%22%3A50%2C%22hole%22%3A35%2C%22gap%22%3A30%2C%22offset%22%3A0%2C%22rearMin%22%3A65%2C%22reach%22%3A200%2C%22reference%22%3A%22centre%22%2C%22extras%22%3A%5B%7B%22type%22%3A%22soap%22%2C%22x%22%3A700%2C%22y%22%3A95%2C%22base%22%3A45%2C%22hole%22%3A25%2C%22reach%22%3A120%2C%22rearMin%22%3A0%7D%5D%7D