# Barkday Curves Helpers — How to Integrate

## Files
- `js/barkday-curves.js`: helpers to generate Bark Day schedules
- `data/curves.json`: tiny config (no big tables)
  - LOCT (Year1/Year2) params
  - Optional `analytic` anchors for t >= 2y (PCHIP)

## Steps
1. Copy files to your repo:
   - `js/barkday-curves.js`
   - `data/curves.json`

2. In `app.js` (where you compute the next Bark Day):
   ```js
   import { buildBarkdayTimes, barkdayDate, nextKAfterNow } from './js/barkday-curves.js';

   // Load curves.json (your existing loader or fetch)
   // const CURVES = await fetch('data/curves.json').then(r=>r.json());

   const curveId = CURVES.defaults.overrides[dog.primaryBreed] || CURVES.defaults.group_curve;
   const conf = CURVES.curves[curveId];

   const times = buildBarkdayTimes(conf, { maxK: 80, tMaxYears: 12 });
   const { k, tYears } = nextKAfterNow(dog.dob, times);
   const nextDate = barkdayDate(dog.dob, tYears);
   ```

3. PDF header text:
   - “Next Bark Day Plan — turning {k} on {DATE}”
   - Optionally, if breed curve is an override, show a small note: “Using {conf.label}”.

4. Tuning knobs:
   - LOCT Year1: `a0_days` (default 10) — raise to avoid early compression.
   - LOCT Year2: `a0_hint_days` (default 38) — start Y2 not below last Y1 gap.
   - For Labs (and future breeds), edit `analytic.anchors` to shape later years smoothly.

## Notes
Keep `curves.json` small (labels + anchors), and compute schedules on the client.
When a breed override is applied, show a small note “Using {conf.label}”.