name: CI

on:
  push:
    branches: [main]
  pull_request:
    branches: [main]
  workflow_dispatch:

jobs:
  test:
    runs-on: ubuntu-latest
    env:
      DATABASE_URL: sqlite:///./ci.db
      PYTHONUNBUFFERED: "1"
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-python@v5
        with:
          python-version: "3.12"
          cache: pip
      - run: python -m pip install --upgrade pip
      - run: python -m pip install -r requirements.txt
      - run: python -m pytest -q
      - run: node --check app/static/admin.js

  deploy:
    if: (github.event_name == 'push' && github.ref == 'refs/heads/main') || github.event_name == 'workflow_dispatch'
    needs: test
    runs-on: ubuntu-latest
    concurrency:
      group: production-deploy
      cancel-in-progress: false
    env:
      PROD_PATH: /srv/miem_workers
      RELEASE_NAME: miem-workers-release-${{ github.run_id }}.tar
    steps:
      - uses: actions/checkout@v4
      - name: Prepare release
        id: prepare
        shell: bash
        run: |
          set -euo pipefail
          backend_version="$(sed -n 's/^BACKEND_VERSION = "\(.*\)"$/\1/p' app/version.py)"
          test -n "$backend_version"
          echo "backend_version=$backend_version" >> "$GITHUB_OUTPUT"
          tar --exclude=.git --exclude=.env -cf "$RUNNER_TEMP/$RELEASE_NAME" .
          printf '%s\n' "$PROD_SSH_KEY" > "$RUNNER_TEMP/deploy_key"
          printf '%s\n' "$PROD_KNOWN_HOSTS" > "$RUNNER_TEMP/known_hosts"
          chmod 600 "$RUNNER_TEMP/deploy_key" "$RUNNER_TEMP/known_hosts"
        env:
          PROD_SSH_KEY: ${{ secrets.PROD_SSH_KEY }}
          PROD_KNOWN_HOSTS: ${{ secrets.PROD_KNOWN_HOSTS }}
      - name: Upload release
        shell: bash
        run: |
          set -euo pipefail
          scp -i "$RUNNER_TEMP/deploy_key" \
            -o BatchMode=yes \
            -o UserKnownHostsFile="$RUNNER_TEMP/known_hosts" \
            "$RUNNER_TEMP/$RELEASE_NAME" \
            "$PROD_USER@$PROD_HOST:$RELEASE_NAME"
        env:
          PROD_HOST: ${{ secrets.PROD_HOST }}
          PROD_USER: ${{ secrets.PROD_USER }}
      - name: Deploy and verify
        shell: bash
        run: |
          set -euo pipefail
          ssh -i "$RUNNER_TEMP/deploy_key" \
            -o BatchMode=yes \
            -o UserKnownHostsFile="$RUNNER_TEMP/known_hosts" \
            "$PROD_USER@$PROD_HOST" \
            "PROD_PATH='$PROD_PATH' RELEASE_NAME='$RELEASE_NAME' EXPECTED_BACKEND_VERSION='$EXPECTED_BACKEND_VERSION' bash -s" <<'REMOTE'
          set -euo pipefail
          cd "$PROD_PATH"
          release="$HOME/$RELEASE_NAME"
          test -f "$release"
          archive_version="$(tar -xOf "$release" ./app/version.py | sed -n 's/^BACKEND_VERSION = "\(.*\)"$/\1/p')"
          test "$archive_version" = "$EXPECTED_BACKEND_VERSION"
          mkdir -p "$HOME/backups/miem_workers"
          backup="$HOME/backups/miem_workers/miem_workers-$(date +%Y%m%d-%H%M%S).sql"
          docker compose exec -T postgres sh -c 'pg_dump -U "$POSTGRES_USER" "$POSTGRES_DB"' > "$backup"
          docker run --rm \
            -v "$release:/src/release.tar:ro" \
            -v "$PROD_PATH":/dst \
            alpine:3.20 sh -c 'tar -xf /src/release.tar -C /dst'
          docker compose up -d --build
          runtime_version="$(docker compose exec -T api python -c 'from app.version import BACKEND_VERSION; print(BACKEND_VERSION)')"
          test "$runtime_version" = "$EXPECTED_BACKEND_VERSION"
          health="$(curl --fail --silent --show-error http://127.0.0.1:8000/api/health)"
          case "$health" in
            *"\"status\":\"ok\""*"\"backend_version\":\"$EXPECTED_BACKEND_VERSION\""*) ;;
            *) echo "Unexpected health response: $health" >&2; exit 1 ;;
          esac
          find "$HOME/backups/miem_workers" -maxdepth 1 -type f -name 'miem_workers-*.sql' ! -path "$backup" -delete
          docker compose ps
          rm -f "$release"
          REMOTE
        env:
          PROD_HOST: ${{ secrets.PROD_HOST }}
          PROD_USER: ${{ secrets.PROD_USER }}
          EXPECTED_BACKEND_VERSION: ${{ steps.prepare.outputs.backend_version }}