trails/CLAUDE.md

CLAUDE.md

Project Overview

trails.cool is a federated, self-hostable platform for outdoor enthusiasts with two apps:

• Planner (apps/planner) — Stateless collaborative route editor. Real-time editing via Yjs, routing via BRouter, no user accounts, sessions are anonymous and ephemeral.
• Journal (apps/journal) — Federated social platform for routes and activities. User accounts, ActivityPub federation via Fedify, PostgreSQL + PostGIS.

Full architecture: docs/architecture.md Philosophy: docs/philosophy.md OpenSpec change: openspec/changes/phase-1-mvp/

Principles

• Privacy-first: The Planner collects zero user data. The Journal documents all data collection in a privacy manifest. Never add tracking, analytics, or data collection without updating the manifest.
• Data ownership: All user data must be exportable in open formats (GPX, JSON). Never create data lock-in.
• Simplicity: Start with the simplest thing that works. Don't add abstractions, config options, or features unless real users need them.
• Open standards: Use GPX, ActivityPub, OpenStreetMap, WebFinger. Don't invent proprietary formats.
• Inclusive language: Use "host" not "master", "allowlist" not "whitelist", etc.

Tech Stack

• Language: TypeScript (strict mode)
• Frontend: React + Tailwind CSS + React Router 7 (Remix stack)
• Maps: Leaflet + OpenStreetMap tiles
• CRDT: Yjs + y-websocket (Planner only)
• Federation: Fedify (Journal only, Phase 2)
• Database: PostgreSQL + PostGIS
• Media storage: S3-compatible (Garage)
• Routing engine: BRouter (Java, runs as separate Docker container)
• i18n: react-i18next (English + German)
• Monorepo: pnpm workspaces + Turborepo

Repository Structure

apps/
  planner/          — Planner app (React Router 7)
  journal/          — Journal app (React Router 7 + Fedify)
packages/
  types/            — Shared TypeScript interfaces (Route, Activity, Waypoint)
  ui/               — Shared React components (Tailwind)
  map/              — Leaflet map wrappers and tile layer configs
  gpx/              — GPX parsing, generation, validation
  i18n/             — react-i18next config + translations
infrastructure/     — Terraform + Docker Compose
openspec/           — OpenSpec specs and changes
docs/               — Architecture, philosophy, tooling docs
docker/brouter/     — BRouter Docker image

Development Commands

pnpm install          # Install dependencies
turbo dev             # Start both apps in dev mode
turbo build           # Build all packages and apps
turbo typecheck       # Type-check all packages
turbo lint            # Lint all packages
turbo test            # Run tests

Code Conventions

• All user-facing strings must use i18n (useTranslation() hook, never hardcode strings)
• Use @trails-cool/types for shared interfaces — don't duplicate type definitions
• Map components go in @trails-cool/map, not in individual apps
• GPX parsing/generation goes in @trails-cool/gpx
• Database schemas: planner.* for Planner data, journal.* for Journal data
• Route geometry must be stored as PostGIS LineString (extracted from GPX on save)

Key Architecture Decisions

• Planner is stateless: No user accounts, no persistent user data. Sessions are anonymous.
• Journal is the source of truth: Routes live on the owner's Journal instance.
• Routing host pattern: One client per Planner session talks to BRouter (elected via Yjs awareness).
• JWT callbacks: Planner saves back to Journal via scoped JWT tokens in callback URLs.
• Sequential versioning: Route versions are v1, v2, v3. Yjs state vectors enable conflict-free merging.
• Single domain: Each instance uses one domain for both web UI and ActivityPub handles.
• Simple permissions: View + Edit only. No fine-grained permissions.

OpenSpec Workflow

Specs live in openspec/. Use these slash commands:

• /opsx:propose — Create a new change with proposal, design, specs, and tasks
• /opsx:apply — Implement tasks from an existing change
• /opsx:explore — Think through ideas before proposing
• /opsx:archive — Archive a completed change