name: Docs CI/CD

on:
  push:
    branches:
      - "main"
    paths:
      - "docs/**"
      - ".github/workflows/docs.yml"
  pull_request:
    branches:
      - "main"
    paths:
      - "docs/**"
      - ".github/workflows/docs.yml"
  workflow_dispatch:

permissions:
  contents: read

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
        with:
          persist-credentials: false

      - name: Install mdbook
        run: tar -xz -C /usr/local/bin -f dev/mdbook/mdbook-v0.5.3-x86_64-unknown-linux-gnu.tar.gz

      - name: Build
        run: cd docs && mdbook build

      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
        if: github.ref == 'refs/heads/main'
        with:
          name: docs-site
          path: docs/book/
          retention-days: 1

  deploy:
    runs-on: ubuntu-latest
    needs: build
    if: github.ref == 'refs/heads/main' && (github.event_name == 'push' || github.event_name == 'workflow_dispatch')
    steps:
      - name: Install rsync
        run: sudo apt-get update && sudo apt-get install -y rsync

      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
        with:
          name: docs-site
          path: site/

      - name: Enable SSH
        env:
          SSH_PRIVATE_KEY: ${{ secrets.SSH_PRIVATE_KEY }}
          SSH_KNOWN_HOSTS: ${{ secrets.SSH_KNOWN_HOSTS }}
        run: |
          mkdir -p ~/.ssh
          printf '%s' "$SSH_PRIVATE_KEY" > ~/.ssh/id_rsa
          chmod 600 ~/.ssh/id_rsa
          printf '%s' "$SSH_KNOWN_HOSTS" > ~/.ssh/known_hosts

      - name: Deploy docs
        env:
          TACHI_HOST: ${{ secrets.TACHI_HOST }}
        run: rsync --recursive --compress --delete --progress ./site/. "ci@${TACHI_HOST}:/srv/tachi-static/docs"