name: Deploy GitHub Pages

# Builds the docs/ site, substitutes the latest release tag into the HTML,
# then deploys the result to GitHub Pages. Runs on:
#   - any push to main that touches docs/, this workflow, or CMakeLists.txt
#   - every published release (so a new tag refreshes the site)
#   - manual dispatch from the Actions tab
on:
  push:
    branches: [main]
    paths:
      - "docs/**"
      - ".github/workflows/pages.yml"
      - "CMakeLists.txt"
  release:
    types: [published]
  workflow_dispatch:

# Required permissions for the deploy-pages action.
permissions:
  contents: read
  pages: write
  id-token: write

# Avoid concurrent deploys; let the latest one win.
concurrency:
  group: "pages"
  cancel-in-progress: false

jobs:
  build:
    name: Build site
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v6.0.2
        with:
          # Needed so the git-tag fallback can find release tags.
          fetch-depth: 0
          fetch-tags: true

      - name: Resolve latest release version
        id: version
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          set -euo pipefail
          # Prefer the latest published GitHub release.
          tag="$(gh release view --repo ${{ github.repository }} --json tagName --jq .tagName 2>/dev/null || true)"
          if [ -z "${tag:-}" ]; then
            # Fall back to the newest semver-looking git tag.
            tag="$(git tag --sort=-v:refname | grep -E '^v?[0-9]+\.[0-9]+\.[0-9]+$' | head -n 1 || true)"
          fi
          if [ -z "${tag:-}" ]; then
            # Last-resort fallback: read version from CMakeLists.txt.
            tag="v$(grep -E 'project\(fast_float VERSION' CMakeLists.txt | sed -E 's/.*VERSION ([0-9.]+).*/\1/')"
          fi
          # Strip a leading "v" — the template uses bare semver after "v".
          version="${tag#v}"
          echo "tag=${tag}" >> "$GITHUB_OUTPUT"
          echo "version=${version}" >> "$GITHUB_OUTPUT"
          echo "Resolved version: ${version} (tag ${tag})"

      - name: Substitute version into HTML
        run: |
          set -euo pipefail
          version='${{ steps.version.outputs.version }}'
          # In-place replace every {{VERSION}} occurrence under docs/.
          find docs -type f \( -name '*.html' -o -name '*.md' -o -name '*.css' -o -name '*.js' \) \
            -exec sed -i "s/{{VERSION}}/${version}/g" {} +

      - name: Setup Pages
        uses: actions/configure-pages@v5

      - name: Upload artifact
        uses: actions/upload-pages-artifact@v3
        with:
          path: docs

  deploy:
    name: Deploy to GitHub Pages
    needs: build
    runs-on: ubuntu-latest
    environment:
      name: github-pages
      url: ${{ steps.deployment.outputs.page_url }}
    steps:
      - name: Deploy
        id: deployment
        uses: actions/deploy-pages@v4