name: Docs Release

# Publishes release docs to the persistent gh-pages branch.
#
# Production tags (vX.Y.Z) own the site root and get a permanent /vX.Y.Z/ copy,
# plus a refreshed Dokka reference at /api/.
#
# Open- and closed-testing tags (vX.Y.Z-open.N / vX.Y.Z-closed.N) publish a
# per-tag snapshot at /vX.Y.Z-open.N/ only. They deliberately do NOT touch the
# root or /api/: the root belongs to production releases, and /api/ is an
# unversioned channel already kept current by docs-deploy.yml on every push to
# main — rebuilding Dokka (~14 min) for each of the many prerelease tags in a
# cycle would cost far more than it refreshes.
#
# These per-tag prerelease directories accumulate during a version cycle and are
# reaped by post-release-cleanup.yml once the production vX.Y.Z tag ships.
#
# The /main/ snapshot is owned by docs-deploy.yml and is left untouched here.
#
# workflow_dispatch exists for backfill: run it against a tag ref to (re)publish
# that version without cutting a new tag.

on:
  push:
    tags:
      # Production plus the open/closed testing tracks. Internal builds are
      # excluded: they are tagged many times per cycle and are not a channel we
      # publish documentation for.
      - 'v*.*.*'
      - '!v*-internal.*'

  workflow_dispatch:

permissions:
  contents: write

concurrency:
  group: pages
  cancel-in-progress: false

jobs:
  publish:
    if: github.repository == 'meshtastic/Meshtastic-Android'
    runs-on: ubuntu-24.04
    timeout-minutes: 45
    steps:
      - name: Checkout
        uses: actions/checkout@v7.0.1
        with:
          submodules: true
          fetch-depth: 0

      # Resolves the tag into: the docs version label (which becomes the
      # published directory name) and whether this is a production release.
      - name: Resolve Release Channel
        id: version
        run: |
          set -euo pipefail
          case "$GITHUB_REF" in
            refs/tags/*) TAG="${GITHUB_REF#refs/tags/}" ;;
            *)
              echo "This workflow must run against a release tag ref (got $GITHUB_REF)." >&2
              echo "For workflow_dispatch, select the tag under 'Use workflow from'." >&2
              exit 1
              ;;
          esac

          if [[ "$TAG" =~ ^v([0-9]+\.[0-9]+\.[0-9]+)$ ]]; then
            echo "docs_version=${BASH_REMATCH[1]}" >> "$GITHUB_OUTPUT"
            echo "is_production=true" >> "$GITHUB_OUTPUT"
            echo "Production release: ${BASH_REMATCH[1]} -> / and /v${BASH_REMATCH[1]}/"
          elif [[ "$TAG" =~ ^v([0-9]+\.[0-9]+\.[0-9]+-(open|closed)\.[0-9]+)$ ]]; then
            echo "docs_version=${BASH_REMATCH[1]}" >> "$GITHUB_OUTPUT"
            echo "is_production=false" >> "$GITHUB_OUTPUT"
            echo "${BASH_REMATCH[2]}-testing prerelease -> /v${BASH_REMATCH[1]}/ only"
          else
            echo "Tag '$TAG' is not a publishable docs channel." >&2
            echo "Expected vX.Y.Z, vX.Y.Z-open.N or vX.Y.Z-closed.N." >&2
            exit 1
          fi

      - name: Gradle Setup
        uses: ./.github/actions/gradle-setup
        with:
          gradle_encryption_key: ${{ secrets.GRADLE_ENCRYPTION_KEY }}
          develocity_access_key: ${{ secrets.DEVELOCITY_ACCESS_KEY }}

      - name: Setup Ruby
        uses: ruby/setup-ruby@v1
        with:
          ruby-version: '4.0.6'
          bundler-cache: true
          working-directory: docs

      # Versioned docs (/vX.Y.Z/ or /vX.Y.Z-open.N/) — built for every channel.
      - name: Build Versioned Docs
        run: ./gradlew generateDocsBundle validateDocsBundle publishDocsSite -Pdocs.channel=release -Pdocs.version=${{ steps.version.outputs.docs_version }} -Pci=true

      # Root site (/) — production releases only.
      - name: Build Root Docs Site
        if: steps.version.outputs.is_production == 'true'
        run: ./gradlew generateDocsBundle publishDocsSite -Pdocs.channel=root -Pci=true

      # Dokka API reference (/api/) — production releases only.
      - name: Build Dokka HTML documentation
        if: steps.version.outputs.is_production == 'true'
        run: ./gradlew dokkaGeneratePublicationHtml -Dorg.gradle.isolated-projects=false --no-configuration-cache

      - name: Compile Jekyll Sites
        env:
          DOCS_VERSION: ${{ steps.version.outputs.docs_version }}
          IS_PRODUCTION: ${{ steps.version.outputs.is_production }}
        run: |
          set -euo pipefail
          # Versioned site
          BUNDLE_GEMFILE=docs/Gemfile bundle exec jekyll build \
            --source "build/_site/v${DOCS_VERSION}" \
            --destination build/jekyll_release \
            --baseurl "/${{ github.event.repository.name }}/v${DOCS_VERSION}"

          # Move the versioned source out of the root source tree so the root
          # build below doesn't try to nest it.
          mv "build/_site/v${DOCS_VERSION}" build/v_temp

          if [ "$IS_PRODUCTION" = "true" ]; then
            BUNDLE_GEMFILE=docs/Gemfile bundle exec jekyll build \
              --source build/_site \
              --destination build/jekyll_root \
              --baseurl "/${{ github.event.repository.name }}"
          fi

      - name: Stage channels
        id: stage
        env:
          DOCS_VERSION: ${{ steps.version.outputs.docs_version }}
          IS_PRODUCTION: ${{ steps.version.outputs.is_production }}
        run: |
          set -euo pipefail
          mkdir -p build/pages_staging
          cp -r build/jekyll_release "build/pages_staging/v${DOCS_VERSION}"
          channels="v${DOCS_VERSION}"
          if [ "$IS_PRODUCTION" = "true" ]; then
            cp -r build/jekyll_root build/pages_staging/root
            cp -r build/dokka/html build/pages_staging/api
            channels="root $channels api"
          fi
          echo "channels=$channels" >> "$GITHUB_OUTPUT"

      - name: Publish to gh-pages
        run: scripts/docs/publish-to-gh-pages.sh build/pages_staging ${{ steps.stage.outputs.channels }}