name: Build Documentation (PR Preview)

on:
  pull_request:
    paths:
      - 'docs/**'
      - 'mkdocs.yml'
      - '.github/workflows/deploy-docs.yml'

permissions:
  contents: read

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Setup Python
        uses: actions/setup-python@v5
        with:
          python-version: '3.x'

      - name: Cache dependencies
        uses: actions/cache@v4
        with:
          path: ~/.cache/pip
          key: ${{ runner.os }}-pip-mkdocs
          restore-keys: |
            ${{ runner.os }}-pip-

      - name: Install MkDocs and dependencies
        run: pip install -r docs/requirements.txt

      - name: Build documentation
        run: mkdocs build --strict --verbose