name: Deploy

# workflow_dispatch only, deliberately (see docs/PLAN.md's "the gate is manual dispatch"). No
# automatic trigger on tag push: release.yml already runs there, and racing a build/push against
# a deploy on the same event is worse than requiring one manual click after confirming the
# release succeeded.
on:
  workflow_dispatch:
    inputs:
      tag:
        description: Image tag to deploy (as pushed by release.yml)
        required: false
        default: latest

env:
  # Pins the compose project name so the web_build named volume is predictably
  # `velodrome_web_build` regardless of which directory `docker compose` is invoked from, and so
  # it's the same name across the populate step and the `up -d` step below.
  COMPOSE_PROJECT_NAME: velodrome
  TAG: ${{ gitea.event.inputs.tag }}
  # The real .env (POSTGRES_SUPERUSER_PASSWORD, the VELODROME_* DSNs and secrets) is NOT in git —
  # see deploy/.env.example for the documented shape. It must already exist at this exact path on
  # the Unraid host before this workflow can succeed. See the PR description for the full manual
  # setup checklist.
  ENV_FILE: /mnt/user/appdata/velodrome/.env

jobs:
  deploy:
    name: Deploy to production
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      # Same registry, same REGISTRY_TOKEN as release.yml — secrets.GITEA_TOKEN cannot push (and,
      # per the Gitea docs for this same limitation, should not be assumed to reliably pull
      # private packages either) from the container registry.
      - uses: docker/login-action@v3
        with:
          registry: 192.168.0.3:3000
          username: ${{ gitea.actor }}
          password: ${{ secrets.REGISTRY_TOKEN }}

      - name: Pull images for this tag
        working-directory: deploy
        run: |
          set -euo pipefail
          docker compose --env-file "$ENV_FILE" pull

      # DooD-safe: this is a one-shot `docker run` whose *command* (not a client-side path
      # argument) does the copying, into a named volume the daemon manages. No `docker cp`, no
      # `mv`/`rm -rf` on a host path, no bind-mount source path on this command line — all of
      # which would silently resolve against the ephemeral job container's own throwaway
      # filesystem instead of the real host under this act_runner's Docker-outside-of-Docker
      # setup. See deploy/docker-compose.yml's header comment for the full explanation.
      - name: Populate web_build volume from the web image
        run: |
          set -euo pipefail
          # `web` isn't a compose service, so the "Pull images" step above never touches it —
          # pull it explicitly here. Matters most when TAG=latest is reused across deploys: a
          # `docker run` on an already-cached tag would otherwise silently reuse stale local
          # content instead of fetching what release.yml just pushed.
          docker pull "192.168.0.3:3000/bbergle/velodrome-web:${TAG}"
          docker run --rm -v velodrome_web_build:/dest \
            "192.168.0.3:3000/bbergle/velodrome-web:${TAG}" \
            sh -c 'rm -rf /dest/* /dest/.[!.]* 2>/dev/null; cp -a /app/build/. /dest/'

      # Explicit one-off, run and must succeed *before* `up -d` — never from the api image's
      # entrypoint, so a failed migration fails this job loudly instead of crash-looping in a
      # container nobody's watching. VELODROME_DATABASE_URL_MIGRATE (the superuser DSN) is passed
      # only as an inline override here, never in the compose file's permanent `api` environment
      # block — see docker-compose.yml's comment and apps/api/README.md's "Why two database
      # connections" for why the long-running app process must never hold it.
      - name: Run database migrations
        working-directory: deploy
        run: |
          set -euo pipefail
          read_var() {
            grep -E "^$1=" "$ENV_FILE" | head -1 | cut -d= -f2-
          }
          SUPERUSER_PW="$(read_var POSTGRES_SUPERUSER_PASSWORD)"
          APP_PW="$(read_var VELODROME_DB_APP_PASSWORD)"
          AUTH_PW="$(read_var VELODROME_DB_AUTH_PASSWORD)"
          for name in SUPERUSER_PW:POSTGRES_SUPERUSER_PASSWORD APP_PW:VELODROME_DB_APP_PASSWORD AUTH_PW:VELODROME_DB_AUTH_PASSWORD; do
            var="${name%%:*}"; label="${name##*:}"
            if [ -z "${!var}" ]; then
              echo "::error::$label not found in $ENV_FILE"
              exit 1
            fi
          done
          # VELODROME_DB_APP_PASSWORD/VELODROME_DB_AUTH_PASSWORD are needed here (Alembic's
          # baseline migration uses them to create the two runtime roles, per
          # apps/api/README.md's env var table) but are deliberately absent from the `api`
          # service's permanent `environment:` block in docker-compose.yml. `--env-file` only
          # feeds ${...} substitution *in the compose YAML* — it does NOT inject variables into
          # the container unless the service's `environment:` block names them. So they must be
          # passed here explicitly, the same way VELODROME_DATABASE_URL_MIGRATE is. (Verified
          # locally: omitting these two makes the migration fail loudly with "must be set before
          # running this migration" from alembic/versions/0001_baseline.py — good, it fails
          # closed rather than silently skipping role creation.)
          docker compose --env-file "$ENV_FILE" run --rm \
            -e VELODROME_DATABASE_URL_MIGRATE="postgresql+asyncpg://postgres:${SUPERUSER_PW}@db:5432/velodrome" \
            -e VELODROME_DB_APP_PASSWORD="${APP_PW}" \
            -e VELODROME_DB_AUTH_PASSWORD="${AUTH_PW}" \
            api alembic upgrade head

      - name: Bring up the stack
        working-directory: deploy
        run: |
          set -euo pipefail
          docker compose --env-file "$ENV_FILE" up -d

      - name: Wait for the API to become healthy
        run: |
          set -euo pipefail
          for i in $(seq 1 10); do
            if curl -fsS http://localhost:8090/api/v1/healthz; then
              echo "Healthy."
              exit 0
            fi
            echo "Not ready yet (attempt $i/10), retrying..."
            sleep 3
          done
          echo "::error::API did not become healthy after deploy."
          exit 1