name: Build and deploy

on:
  push:
    branches: [master]
  workflow_dispatch: {}

jobs:
  build-and-deploy:
    runs-on: self-hosted
    container: python:3.12-slim
    steps:
      - name: Install system dependencies
        run: |
          apt-get update
          apt-get install -y --no-install-recommends git rsync openssh-client nodejs

      - name: Checkout
        uses: actions/checkout@v4
        with:
          submodules: false

      - name: Set up SSH key
        # Same key used both as the theme repo's deploy key (Gitea) and for
        # the webserver login (below) — one secret, two authorized_keys entries.
        env:
          DEPLOY_SSH_KEY: ${{ secrets.DEPLOY_SSH_KEY }}
          DEPLOY_HOST: ${{ vars.DEPLOY_HOST }}
          DEPLOY_PORT: ${{ vars.DEPLOY_PORT }}
        run: |
          mkdir -p ~/.ssh
          printf '%s\n' "$DEPLOY_SSH_KEY" > ~/.ssh/deploy_key
          chmod 600 ~/.ssh/deploy_key
          ssh-keyscan -4 -v -H git.haemka.in >> ~/.ssh/known_hosts
          ssh-keyscan -4 -v -H -p "${DEPLOY_PORT:-22}" "$DEPLOY_HOST" >> ~/.ssh/known_hosts

      - name: Fetch theme submodule
        run: |
          # Override the submodule's tracked HTTPS URL for this checkout only,
          # so it's fetched over SSH with the deploy key instead of needing a
          # token with access to both repos.
          git config submodule.themes/latex.url git@git.haemka.in:hmk/pelican-latex.git
          GIT_SSH_COMMAND="ssh -4 -i ~/.ssh/deploy_key -o StrictHostKeyChecking=yes" \
            git submodule update --init --recursive

      - name: Install Python dependencies
        run: pip install --no-cache-dir -r requirements.txt

      - name: Build site
        run: pelican -s publishconf.py

      - name: Deploy via rsync
        env:
          DEPLOY_HOST: ${{ vars.DEPLOY_HOST }}
          DEPLOY_PORT: ${{ vars.DEPLOY_PORT }}
          DEPLOY_USER: ${{ secrets.DEPLOY_USER }}
          DEPLOY_PATH: ${{ vars.DEPLOY_PATH }}
        run: |
          rsync -avz --delete \
            -e "ssh -4 -i ~/.ssh/deploy_key -p ${DEPLOY_PORT:-22} -o StrictHostKeyChecking=yes" \
            output/ "${DEPLOY_USER}@${DEPLOY_HOST}:${DEPLOY_PATH}"
