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 netcat-openbsd dnsutils

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

      # Temporary diagnostic step — remove once the aquaria connectivity
      # issue is root-caused. ssh-keyscan swallows pre-handshake failures
      # even with -v, so this checks DNS + raw TCP connect independently.
      - name: Diagnose connectivity to deploy host
        env:
          DEPLOY_HOST: ${{ vars.DEPLOY_HOST }}
          DEPLOY_PORT: ${{ vars.DEPLOY_PORT }}
        run: |
          echo "--- DNS resolution ---"
          getent hosts "$DEPLOY_HOST" || echo "getent: no result"
          dig +short A "$DEPLOY_HOST" || true
          dig +short AAAA "$DEPLOY_HOST" || true
          echo "--- TCP connect (IPv4) ---"
          nc -4 -zv -w 8 "$DEPLOY_HOST" "${DEPLOY_PORT:-22}" || echo "nc exit code: $?"

      - 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
          # -t rsa: both hosts confirmed to offer an RSA host key. Restricting
          # to one type means one connection per host instead of ~4 fired at
          # once (one per probed key type), which aquaria's connection-rate
          # limiting was intermittently dropping past the first.
          ssh-keyscan -4 -t rsa -H git.haemka.in >> ~/.ssh/known_hosts
          ssh-keyscan -4 -t rsa -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}"