name: Push to SFTP

on:
  workflow_dispatch:
  # push:
  #   branches:
  #     - main # Optional: Run automatically on pushes to the main branch

# OPS-011 — what this workflow now guarantees, and what it still does not.
#
# Guaranteed:
#   - nothing is uploaded unless the test suite and the linters pass;
#   - only files on an explicit allowlist are uploaded, so a new file at the
#     repository root does not reach production by default. That is how
#     clear_db.py — a script that DROPs every table and recreates
#     admin/password — got there in the first place;
#   - after the upload, /health is polled until it answers healthy, and the
#     job fails loudly if it does not. Before, a half-uploaded tree was a
#     green deployment.
#
# NOT guaranteed — the switch is not atomic. Files are mirrored in place, so
# for the length of the transfer production runs a mixture of two versions.
# Closing that needs a release-directory layout, which has three
# prerequisites, two of which cannot be done from here:
#
#   1. the Pterodactyl startup command must run the app from `current/`
#      rather than from the server root, and the server must be restarted on
#      switch — a panel change;
#   2. `documents/`, `logs/` and `.env` must live beside the releases, not
#      inside one. DOCUMENTS_ROOT exists for this (app/storage.py);
#   3. contract paths must be relative to that root, so the switch does not
#      strand them. Done: new rows are relative, old absolute ones still
#      resolve.
#
# docs/deployment.md carries the design and the rollback procedure.

jobs:
  deploy-to-sftp:
    runs-on: ubuntu-latest

    steps:
      # Was @v7, which does not exist (latest major is v5): the workflow
      # failed on its very first step.
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: '3.12'

      - name: Install dependencies
        run: pip install -r requirements.txt -r requirements-dev.txt

      # The gate. This runner is not the GitHub one, so a green CI over
      # there proves nothing about what is about to be shipped from here:
      # the deploy is triggered by hand, on whatever the branch holds.
      - name: Refuse to deploy a broken tree
        run: |
          python -m pytest -q
          python -m ruff check .
          python -m ruff format --check .

      # An allowlist, not a list of exclusions. The previous form mirrored
      # the whole working tree minus nine globs, so every file added to the
      # repository shipped to production unless someone remembered to
      # exclude it. This inverts the default: a new top-level file has to be
      # named here to reach the server.
      - name: Assemble the release payload
        run: |
          set -euo pipefail
          mkdir -p payload
          cp -r app payload/
          cp requirements.txt wsgi.py payload/
          # Compiled catalogues are versioned deliberately: the deployment is
          # a file mirror with no build step (docs/translations.md).
          find payload -name '__pycache__' -type d -prune -exec rm -rf {} +
          find payload -name '*.pyc' -delete
          echo "Shipping $(find payload -type f | wc -l) files:"
          find payload -maxdepth 2 -type d | sort

      - name: Set up SSH Private Key
        env:
          # Binds the secret to a secure environment variable
          SSH_PRIVATE_KEY: ${{ secrets.SSH }}
        run: |
          mkdir -p ~/.ssh
          # Uses the environment variable, so the raw key is never printed in the execution log
          echo "$SSH_PRIVATE_KEY" > ~/.ssh/id_rsa
          chmod 600 ~/.ssh/id_rsa

      - name: Push files via SFTP with progress
        run: |
          # --delete is deliberately NOT used. Uploaded contracts, logs and the
          # server's own .env live under the deployment root and are absent
          # from the repository; deleting anything not present locally would
          # destroy them. Stale files therefore still accumulate — that is the
          # other half of what the release-directory layout would fix.
          lftp -e "set sftp:connect-program 'ssh -a -x -i ~/.ssh/id_rsa -o StrictHostKeyChecking=no -o BatchMode=yes -o PasswordAuthentication=no'; \
              set sftp:auto-confirm yes; \
              set net:max-retries 5; \
              set net:timeout 30; \
              set cmd:fail-exit yes; \
              open -u ${{ secrets.SSH_USER }}, sftp://sftp.node4.immortal.host:2022; \
              mirror -R --verbose --parallel=4 ./payload/ ./; \
              quit"

      # Without this a deployment that left the site 500ing reported success,
      # and the first person to hear about it was a user. /health checks the
      # database connection and reports whether the Discord bot thread is
      # alive (OPS-012).
      # HEALTH_URL is carried as a secret rather than as a variable. It is
      # not secret — it is the public site — but `secrets` is the context
      # this runner is already known to support, and a smoke test that fails
      # to run because of an unsupported expression is worse than none.
      - name: Smoke test
        if: ${{ secrets.HEALTH_URL != '' }}
        env:
          HEALTH_URL: ${{ secrets.HEALTH_URL }}
        run: |
          set -euo pipefail
          # The app is restarted by the panel, not by this workflow, so the
          # first few probes are expected to fail or answer from the old
          # process. Two minutes, then give up.
          for attempt in $(seq 1 24); do
            body=$(curl -fsS --max-time 10 "$HEALTH_URL" 2>/dev/null) || body=''
            if echo "$body" | grep -q '"status": *"healthy"'; then
              echo "Healthy after ${attempt} attempt(s):"
              echo "$body"
              exit 0
            fi
            echo "attempt ${attempt}: not healthy yet"
            sleep 5
          done
          echo "::error::/health never reported healthy. The deployment is live and may be broken — see the rollback procedure in docs/deployment.md."
          exit 1

      - name: Warn when no health check is configured
        if: ${{ secrets.HEALTH_URL == '' }}
        run: |
          echo "::warning::HEALTH_URL is not set, so this deployment was not verified. Set it to https://<host>/health in the repository secrets."