bincio-activity/CLAUDE.md

BincioActivity — Context for Claude

What this project is

BincioActivity is a federated, open-source, self-hosted activity stats platform (think personal Strava). Two-stage pipeline:

1. bincio extract (Python): GPX/FIT/TCX → BAS JSON data store
2. bincio render (Astro/Node): BAS data store → static website

The BAS (BincioActivity Schema) JSON files are the federation protocol. Anyone can publish their data as BAS JSON and others can include it.

Key design decisions

• No database, no server — everything is static files
• Python with uv for the extract stage
• Astro + Svelte + Tailwind + MapLibre GL + Observable Plot for the site
• Haversine (not geopy) for distance calculations (10x faster)
• Worker initializer pattern for ProcessPoolExecutor — large shared data (strava_lookup dict, known_hashes frozenset) is sent once per worker via initializer=, not once per task
• BAS activity IDs always use UTC with Z suffix for URL safety
• TCX files from Garmin use both http:// and https:// namespace URIs — parser handles both

Your data

• Source: ~/your-activity-data/
  • activities/ — Strava export (GPX, FIT, TCX, all with .gz variants)
  • Any subdirectories with FIT files from Garmin/Karoo devices
  • activities.csv — Strava metadata (names, descriptions, gear)
• Extracted output: ~/bincio_data/ (or /tmp/bincio_test/ for testing)

Configure input paths in extract_config.yaml.

Project structure

bincio/                    Python package
  extract/
    models.py              DataPoint, ParsedActivity, LapData
    parsers/               GPX, FIT, TCX parsers + factory
    sport.py               sport name normalisation
    metrics.py             haversine-based stats computation (single pass)
    timeseries.py          downsample to 1Hz, build BAS timeseries object
    simplify.py            RDP track simplification → GeoJSON
    dedup.py               exact (hash) + near-duplicate detection
    strava_csv.py          Strava activities.csv importer
    writer.py              BAS JSON + GeoJSON writer
    config.py              extract_config.yaml loader
    cli.py                 `bincio extract` CLI
  render/
    cli.py                 `bincio render` CLI (symlinks data, runs astro build/dev)
    merge.py               sidecar edit overlay (produces _merged/)
  edit/
    cli.py                 `bincio edit` CLI
    server.py              FastAPI write API for the edit drawer
schema/
  bas-v1.schema.json       JSON Schema for BAS
SCHEMA.md                  Human-readable BAS spec
site/                      Astro project
  src/
    layouts/Base.astro
    pages/
      index.astro           Activity feed (loads index.json client-side)
      activity/[id].astro   Single activity (SSG, loads detail JSON client-side)
      stats/index.astro     Heatmap + year totals
    components/
      ActivityFeed.svelte   Card grid, sport filter, pagination
      ActivityDetail.svelte Map + stats + charts + photo gallery
      ActivityMap.svelte    MapLibre GL (gradient track, linked hover dot)
      ActivityCharts.svelte Observable Plot (elevation/speed/HR/cadence tabs)
      StatsView.svelte      Yearly heatmap + totals
      EditDrawer.svelte     Slide-in edit panel (visible when PUBLIC_EDIT_URL set)
    lib/
      types.ts              BAS TypeScript types
      format.ts             formatDistance, formatDuration, sportIcon, etc.

How to run

# Extract
cd ~/src/bincio_activity
uv run bincio extract --input ~/your-activity-data/activities --output /tmp/bincio_test

# Site dev server
cd site
ln -sf /tmp/bincio_test/_merged public/data   # point at merged output
cp .env.example .env && $EDITOR .env           # set BINCIO_DATA_DIR
npm run dev

# Edit server (optional — enables edit drawer in the site)
uv run bincio edit --data-dir /tmp/bincio_test
# set PUBLIC_EDIT_URL=http://localhost:4041 in site/.env

# Tests
uv run pytest

MapLibre GL + Vite/Astro — known gotchas

Learnt the hard way during debugging (March 2026):

• maplibregl.workerUrl = ... is the v3 API and silently no-ops in v4+. The v5 API is maplibregl.setWorkerUrl(url), but you don't need it at all in a normal Vite environment — MapLibre handles the blob worker automatically.

• optimizeDeps: { exclude: ['maplibre-gl'] } breaks tile loading. It prevents Vite from converting MapLibre's UMD bundle to ESM. The UMD bundle uses AMD define() internally; served raw, the tile worker blob fails silently → black map, no tiles. The correct setting is include: ['maplibre-gl'].

• build.target: 'es2022' (and optimizeDeps.esbuildOptions.target) is required. MapLibre's dependencies use ES2022 class field syntax. If esbuild downgrades it, helpers like __publicField aren't available inside the serialised worker blob scope → tile loading fails. This is a known upstream issue (maplibre-gl-js #6680).

• Use static imports, not dynamic await import('maplibre-gl'), when possible. With client:only="svelte" in Astro, SSR never runs for the component so there is no window is not defined risk. Static import lets Vite pre-bundle correctly.

• Use client:only="svelte" (not client:load) for the activity detail page. client:load does SSR + hydration; complex interactive components with MapLibre can hit hydration mismatch issues. client:only mounts fresh on the client only.

• MapLibre v5 requires explicit center and zoom in the Map constructor. v4 silently defaulted to center: [0,0], zoom: 0. v5 leaves internal projection state undefined → Cannot read properties of undefined (reading 'lng') crashes on any operation that touches coordinates (markers, resize, render). Always pass center and zoom even if you plan to fitBounds later.

• MapLibre v5 requires setLngLat() on markers before .addTo(map). v4 tolerated markers without coordinates. v5 calls Marker._update() inside addTo(), which needs valid lngLat → same 'lng' crash. Set a dummy [0, 0] if the real position arrives later (e.g. hover markers).

Observable Plot — known gotchas

• Curve names are hyphenated, not camelCase. Use "monotone-x", not "monotoneX". Plot uses its own curve name registry (not raw d3 identifiers). Wrong names throw unknown curve at runtime.

The working astro.config.mjs Vite section:

vite: {
  optimizeDeps: {
    include: ['maplibre-gl'],
    esbuildOptions: { target: 'es2022' },
  },
  build: { target: 'es2022' },
},

Activity sidecar edits — design spec

Users edit activities via sidecar markdown files in the data dir. No database, no server — consistent with the project's static-files-only philosophy.

File naming

~/bincio_data/
  activities/{id}.json    ← immutable extract output
  edits/{id}.md           ← user edits (sidecar)
  edits/images/{id}/      ← uploaded photos
  _merged/                ← render-time merge output (gitignored-style)

Sidecar format

---
title: "Epic climb up Monte Grappa"
sport: cycling
hide_stats: [cadence]
highlight: true
private: false
gear: "Trek Domane"
---

Rode with friends. Legs felt great after the rest week...

Editing UX: drawer in Astro + bincio edit write API

• bincio edit --data-dir ~/bincio_data starts a FastAPI server on port 4041
• Set PUBLIC_EDIT_URL=http://localhost:4041 in site/.env to enable the edit button
• Clicking Edit on any activity detail page opens a slide-in drawer
• Saving writes the sidecar and triggers merge_all() automatically
• bincio render always runs merge_all() before build/serve and symlinks public/data → _merged/

PUBLIC_EDIT_URL as feature flag

• Unset → no Edit button, normal static site
• Set → edit drawer enabled; lives in site/.env (gitignored)

Known issues / next steps

• bincio render Python CLI is functional but --watch mode not yet implemented
• Activity IDs in older test data may use +0000 format (pre-fix); re-run extract to get Z format
• Some activities appear with both untitled and titled IDs (near-dedup timing race)
• Federation (remote data sources) not yet implemented in site
• Friends pages (/friends/{handle}/) not yet implemented
• The site/.env file is gitignored — copy from site/.env.example

What "good" looks like (not yet done)

• bincio render Python CLI wraps astro build properly
• Friends/federation pages in site
• Personal records page
• Activity search / full-text filter in feed
• GitHub Actions template for auto-publish
• Karoo/Garmin Connect importers beyond Strava
• bincio.render.merge — sidecar parser, _merged/ output, private filter, highlight sort
• bincio edit FastAPI write API (GET/POST activity, image upload/delete, triggers merge)
• EditDrawer.svelte — slide-in edit UI in the Astro site
• PUBLIC_EDIT_URL feature flag
• Markdown rendering in activity description with image path rewriting
• Photo gallery with lightbox on activity detail page
• bincio render --watch incremental rebuild on sidecar/data changes
• Highlight badge in activity feed cards