# EtherCalc self-host compose file (§13 Q5).
#
# Default service — the standalone workerd Worker. No Redis: room state
# lives in Durable Object SQLite files under the `./ethercalc-data`
# bind-mounted at /data in the container. `docker compose up -d` is the
# whole install story.
#
# Migration profile — activated with `--profile migrate`, adds two
# short-lived services (`legacy-redis` + `migrator`) that ingest a
# legacy Redis dump.rdb into the new Worker in one shot. Driven by
# `bin/migrate-legacy.sh`; end users should not invoke the profile
# directly.

services:
  ethercalc:
    build:
      context: .
      dockerfile: Dockerfile
    image: ethercalc:selfhost
    container_name: ethercalc
    restart: unless-stopped
    ports:
      # Host 8000 matches the legacy port from the old compose file.
      - "8000:8000"
    volumes:
      # Persistent Durable Object state. Survives container restarts.
      # Created on first `up` if missing.
      - ./ethercalc-data:/data
    environment:
      # All variables are optional; sensible defaults live in the image.
      # Pass through from the host so `ETHERCALC_KEY=secret docker compose
      # up -d` Just Works without editing this file.
      ETHERCALC_PORT: "${ETHERCALC_PORT:-8000}"
      ETHERCALC_HOST: "${ETHERCALC_HOST:-0.0.0.0}"
      ETHERCALC_KEY: "${ETHERCALC_KEY:-}"
      ETHERCALC_DISABLE_ROOM_INDEX: "${ETHERCALC_DISABLE_ROOM_INDEX:-1}"
      ETHERCALC_CORS: "${ETHERCALC_CORS:-}"
      ETHERCALC_BASEPATH: "${ETHERCALC_BASEPATH:-}"
      ETHERCALC_EXPIRE: "${ETHERCALC_EXPIRE:-}"
      # Always forwarded; the migrate endpoint returns 404 when unset
      # so leaving it blank keeps the route invisible in normal runs.
      ETHERCALC_MIGRATE_TOKEN: "${ETHERCALC_MIGRATE_TOKEN:-}"
    # Health check lets the migrator service wait until /_health is
    # answering before firing the first seed PUT.
    healthcheck:
      test: ["CMD-SHELL", "curl -fsS http://localhost:8000/_health >/dev/null || exit 1"]
      interval: 2s
      timeout: 2s
      retries: 60
      start_period: 5s

  # ────────────────────────── migration profile ──────────────────────────
  # Activated with `docker compose --profile migrate up`. Typical entry
  # point is `./bin/migrate-legacy.sh`, which wires the dump file, token,
  # and post-run backup in one go.

  legacy-redis:
    profiles: ["migrate"]
    image: redis:7-alpine
    container_name: ethercalc-legacy-redis
    # Redis's upstream entrypoint chowns /data/* at startup, which
    # fails against a read-only bind mount. Bind the user's dump to
    # an /input/ stage instead, copy it into the container-owned
    # /data at boot, then exec redis. Side effect: peak disk use
    # during migration is 2× the dump size (acceptable — migration
    # is transient, and the host copy is preserved untouched).
    entrypoint: ["/bin/sh", "-c"]
    command:
      - 'cp /input/dump.rdb /data/dump.rdb && exec redis-server --dir /data --dbfilename dump.rdb --save "" --appendonly no'
    volumes:
      # `ETHERCALC_LEGACY_DUMP` is set by `bin/migrate-legacy.sh` to
      # the absolute path of the user's dump.rdb. `:ro` guarantees the
      # source file is never modified even if something in the stack
      # misbehaves.
      - "${ETHERCALC_LEGACY_DUMP:-./legacy-dump.rdb}:/input/dump.rdb:ro"
    healthcheck:
      test: ["CMD", "redis-cli", "ping"]
      interval: 2s
      timeout: 2s
      retries: 60
      start_period: 5s

  migrator:
    profiles: ["migrate"]
    image: ethercalc:selfhost
    container_name: ethercalc-migrator
    # Same image as the worker — bun + bin/ethercalc are already there.
    # One-shot: `ethercalc migrate`, then exit. `--abort-on-container-
    # exit` + `--exit-code-from migrator` on `docker compose up` makes
    # the wrapper script fail loudly if the migrator itself fails.
    depends_on:
      legacy-redis:
        condition: service_healthy
      ethercalc:
        condition: service_healthy
    environment:
      ETHERCALC_MIGRATE_TOKEN: "${ETHERCALC_MIGRATE_TOKEN:-}"
    entrypoint: ["/app/bin/ethercalc"]
    command:
      - "migrate"
      - "--source"
      - "redis://legacy-redis:6379"
      - "--target"
      - "http://ethercalc:8000"
      - "--token"
      - "${ETHERCALC_MIGRATE_TOKEN:-}"
      - "--concurrency"
      - "${ETHERCALC_MIGRATE_CONCURRENCY:-8}"
    restart: "no"