foodster/README.md

# Foodster

A self-hosted dinner log and meal suggester for a single household. Record
what the family actually ate, and — later — let the app propose seven dinners
drawn from that history.

The interface is in Finnish. The code, comments and documentation are in
English.

See [PRD.md](PRD.md) for the full specification.

## Status

**Stage 1 — eating history: in development.** The meal catalog and the daily
log come first, because the suggester is worthless until there are a few
weeks of real history to weight against.

Working:

- **Kirjaa** — log a dinner: pick a dish, tick sides, save. Dishes are ordered
  and sized by how often they are eaten, so the likely answer is the biggest
  target. The history sits on the same page underneath: every day back to the
  first entry, unlogged days shown as explicit gaps, and every row a link that
  loads that day into the logger above it.
- **Ruuat** — add, edit and delete mains and sides, or import a whole bundle
  by paste or file upload. Grouped by category and alphabetical inside, since
  this is a list you manage rather than one you pick from. Deletes are soft,
  so old log entries keep showing the dish they used.
- **Light / dark**, remembered per device, dark by default. The button shows
  the theme that is on — moon while dark, sun while light — not the one a
  click would bring.

Still to build:

- Live search as you type, and paging for the history and catalog lists once
  years of entries make them long. Both via Datastar.
- Category icons instead of plain colour dots — colour and shape together, so
  a red blob and a yellow blob are told apart by more than hue.
- Edit and delete as icons in the catalog rows, and a confirmation step before
  a delete actually happens.
- A background for the header. Something subtle; the palette gets overhauled
  later.
- Stage 2: the seven-meal suggester, which starts once there is history to
  weight against.

## Stack

One static Go binary. No Node.js, no bundler, no separate database server.

| | |
|---|---|
| Language | Go 1.27 |
| HTTP | stdlib `net/http` + `http.ServeMux` |
| Views | [templ](https://templ.guide), server-rendered |
| Interactivity | [Datastar](https://data-star.dev) — signals and DOM patching in one ~11 kB script |
| Styling | hand-written CSS, `light-dark()` for themes |
| Database | SQLite via `modernc.org/sqlite` (pure Go) |
| Auth | HTTP Basic, one shared household password |
| Runtime image | `FROM scratch` |

## Branches

`main` holds released versions only. Every release tag points at a commit on
`main`, so its history is the deployment history. **Nothing is committed to
`main` directly** — it moves only by fast-forwarding `dev` into it.

All development happens on `dev`. `main` is protected on the remote: it takes
no direct pushes, so a release arrives through a pull request.

```sh
git switch dev                              # where the work happens
# ... commits ...
make check                                  # lint, unit tests, smoke
git push origin dev

tea pr create --base main --head dev        # or open it in the forge
# merge the pull request, then:

git switch main && git pull --ff-only
make release                                # builds, tags vYYYYMMDD-N, pushes the image
git push origin --tags
```

`make image` additionally refuses to run from any branch but `main`, so a
release tag can never point at a commit that was not released. That check
lives locally because it has to: tags and images are built before anything
reaches the remote, so protection there cannot catch it.

## Quick start

```sh
cp .env.example .env     # then edit it
make run                 # http://localhost:8080
```

`make` on its own lists every target:

```
make fix        gofmt, templ fmt, go mod tidy
make lint       go vet, gofmt check, golangci-lint when installed
make test       go test ./...
make build      ./foodster
make seed       import a dish bundle (SEED=seeds/testi.json)
make vendor     re-download the Datastar client
make image      build and tag vYYYYMMDD-N (creates a git tag)
make push       push the newest tag and :latest
make release    image + push
make up/down/logs   compose
```

## Importing dishes

The **Ruuat** tab takes a bundle of mains and sides: paste the JSON or upload
a file, and the app reports row by row what it did.

```json
{
  "mains": [{"name": "Kanacurry", "categories": ["chicken"], "has_sides": true}],
  "sides": [{"name": "Riisi"}]
}
```

Categories are `meat`, `chicken`, `fish` and `vegetarian` — stored in English
even though the UI is Finnish. A dish may list several, which is how
build-your-own meals like tortillas cover every category at once. `has_sides`
defaults to `true` when omitted.

Import is best-effort, never atomic. Valid rows land; invalid ones are skipped
and named (`tuntematon kategoria`, `ei kategorioita`, `jo listalla`).

Names are normalized to sentence case on the way in — whitespace collapses and
the first letter is capitalized, the rest is left as typed, because Finnish
capitalizes only the first word of a phrase. `keitetyt perunat` is stored as
`Keitetyt perunat`, while `BBQ-kylkeä` and `Kotipizza` keep their capitals.
Duplicates are caught case-insensitively, so re-importing a bundle is safe.

The same importer runs from the command line when you just want to repopulate
a scratch database:

```sh
make seed                      # or: SEED=seeds/other.json make seed
```

## Icons

`cmd/foodster/static/favicon.svg` is the browser-tab icon and follows the
system theme. The home-screen icons are PNGs, because a home-screen icon
cannot be transparent and must not change with the theme; they are rasterised
from `assets/icon.svg`, which is opaque and keeps the artwork inside the
central 80% so Android can mask it to any shape.

```sh
make icons      # rsvg-convert, then optipng -o7
```

The PNGs are committed so the build needs no rasterizer. Re-run `make icons`
after editing `assets/icon.svg`.

## Migrations

Numbered SQL files in `cmd/foodster/migrations`, embedded in the binary and
applied in filename order at startup. Each runs in a transaction and is
recorded in `schema_migrations`, so it applies exactly once.

Adding one means dropping a new `NNNN_what_it_does.sql` into that directory.
Never edit a migration that has already shipped — a released file has run on
a live database and will not run again.

## Configuration

Everything is environment variables. `.env` is gitignored; start from
`.env.example`.

| Variable | Default | Purpose |
|---|---|---|
| `PASSWORD` | *required* | Shared password. The app will not start without it. |
| `DB` | `./data/foodster.db` | SQLite file path; the directory is created if missing. |
| `ENV` | `prod` | Anything else is prefixed to the tab title (`dev · Foodster`). |
| `ADDR` | `:8080` | Listen address. Only useful for a second local instance. |
| `PUID` / `PGID` | `1000` | Host owner of `./data`, for the bind mount. |
| `TZ` | `Europe/Helsinki` | Used for every calendar-day calculation. |

Names carry no prefix: the container gives them their own namespace already.
`PUID`/`PGID` are the exception — `UID` is read-only in bash, so a value set
in `.env` would be silently replaced by the invoking shell's own.
| `REPO` | *required to build* | Image repository, no tag. |
| `TAG` | `latest` | Tag to run under compose. |
| `HOST` | *required to run* | Hostname Traefik routes to. |

Set `TZ` in development too. Under UTC the date rolls over three hours late,
which is exactly when dinner gets logged.

## Deployment

Images are built with Podman and run under Docker Compose on a LAN server.
They are OCI images, so either engine works.

```sh
make release             # build, tag, push
# on the server:
docker compose pull && docker compose up -d
```

Versions are CalVer — `vYYYYMMDD-N`, where `N` is the Nth build that day. The
running version is served at `GET /healthz`, which is the one route outside
authentication.

There is no database container. SQLite lives in `./data`, bind-mounted into
the container, so a backup is `cp -r data` and you can inspect the file with
any sqlite client without going through the engine.

That directory must exist and be owned by the user compose runs as — `make up`
creates it, and `PUID`/`PGID` in `.env` tell the container who
that is. Get them from `id -u` and `id -g`.

If the app exits with `cannot open /data/foodster.db ... unable to open
database file (14)`, the ownership does not match. Docker creates a missing
bind-mount directory as root, and the container is not root:

```sh
ls -ldn data                      # whose is it?
sudo chown -R 1000:1000 data      # match PUID / PGID
docker compose restart
```

## Security

Access is a single shared password over HTTP Basic — no accounts, no
sessions. Credentials are compared in constant time over SHA-256 digests, so
neither the password nor its length leaks through timing.

The app is served on a public hostname behind Traefik, which terminates TLS,
so the credentials are encrypted in transit. That leaves the password as the
only thing between the internet and the app, so wrong guesses are rate
limited per client address: five in a burst, then one per ten seconds,
answered with `429`. Requests carrying no `Authorization` header are not
charged — that is the handshake every browser session begins with, and
counting it would lock the household out for simply opening the app.

`X-Forwarded-For` is trusted only when the connection came from a private
address, meaning it arrived through the proxy. A client connecting directly
could otherwise forge a new address per attempt and skip the limiter.

**None of this replaces a strong `PASSWORD`.** Rate limiting removes
brute force as a practical route; it does not make a guessable password safe.

## Mockups

`mockups/` holds standalone HTML design studies. Open them directly in a
browser; they are references, not part of the build.

## License

[MIT](LICENSE).