name: Deploy Documentation

# Publishes the main-branch docs snapshot to /main/ (and refreshed Dokka to
# /api/) on the persistent gh-pages branch. The site root (latest release)
# and /vX.Y.Z/ folders are owned by docs-release.yml and are left untouched.

on:
  push:
    branches: [main]
    paths:
      # Dokka sources (KDoc in source files)
      - 'androidApp/src/**'
      - 'core/**/src/**'
      - 'feature/**/src/**'
      - 'desktopApp/src/**'
      # Docs site sources
      - 'docs/**'
      - 'feature/docs/**'
      # Build infrastructure. Module scripts are included because they can add or
      # drop exported `api` dependencies and reshape source sets, changing the
      # generated reference without any edit under src/.
      - 'build-logic/**'
      - '**/build.gradle.kts'
      - 'settings.gradle.kts'
      - '.github/workflows/docs-deploy.yml'
      - 'scripts/docs/**'

  workflow_dispatch:

permissions:
  contents: write

# Shares the group with docs-release.yml so gh-pages pushes serialize.
# cancel-in-progress must stay false: a snapshot deploy must never cancel an
# in-flight release publish (GitHub still coalesces queued runs to one).
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

      - 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

      # Dokka is the slowest part of this workflow (~14 min) but KDoc changes far
      # less often than the prose docs. Rebuild /api/ only when something that can
      # actually change the generated reference was touched; otherwise the existing
      # /api/ on gh-pages is left in place (the publisher overlays per channel).
      # Manual runs always rebuild everything, so the diff is only needed on push.
      - name: Detect Dokka-relevant changes
        if: github.event_name != 'workflow_dispatch'
        uses: dorny/paths-filter@v4
        id: filter
        with:
          token: ''
          filters: |
            # Positive patterns only. paths-filter evaluates each pattern as an
            # independent predicate and ORs them together, so a '!excluded/**'
            # entry would match every path outside that dir and make the filter
            # always true. The modules in DOKKA_EXCLUDED_MODULES that live under
            # these prefixes (:core:konsist) therefore still trigger a rebuild;
            # they change rarely enough that the odd wasted run is fine.
            dokka:
              - 'androidApp/src/**'
              - 'core/**/src/**'
              - 'feature/**/src/**'
              - 'desktopApp/src/**'
              # Dokka config, module list and the plugin classpath. '**/build.gradle.kts'
              # covers the root script as well as every module's, since a module script
              # can change exported `api` deps or source sets with no src/ edit.
              - 'build-logic/**'
              - '**/build.gradle.kts'
              - 'settings.gradle.kts'
              - 'gradle/libs.versions.toml'

      - name: Generate Docs Site (main channel)
        run: ./gradlew generateDocsBundle validateDocsBundle publishDocsSite -Pdocs.channel=main -Pci=true

      # Dokka (Gradle) and Jekyll (Ruby) are independent — Dokka's output is only
      # copied in afterwards — so run them concurrently to overlap the two slowest
      # steps (~14 min Dokka vs ~5 min Jekyll) instead of summing them.
      - name: Build Dokka + Jekyll concurrently
        env:
          BUILD_DOKKA: ${{ steps.filter.outputs.dokka == 'true' || github.event_name == 'workflow_dispatch' }}
        run: |
          set -euo pipefail
          BUNDLE_GEMFILE=docs/Gemfile bundle exec jekyll build \
            --source build/_site/main \
            --destination build/jekyll_site \
            --baseurl /${{ github.event.repository.name }}/main &
          jekyll_pid=$!
          if [ "$BUILD_DOKKA" = "true" ]; then
            ./gradlew dokkaGeneratePublicationHtml -Dorg.gradle.isolated-projects=false --no-configuration-cache
          else
            echo "No Dokka-relevant changes — skipping API reference rebuild."
          fi
          wait "$jekyll_pid"

      - name: Stage channels
        id: stage
        env:
          BUILD_DOKKA: ${{ steps.filter.outputs.dokka == 'true' || github.event_name == 'workflow_dispatch' }}
        run: |
          set -euo pipefail
          mkdir -p build/pages_staging
          cp -r build/jekyll_site build/pages_staging/main
          channels="main"
          if [ "$BUILD_DOKKA" = "true" ]; then
            cp -r build/dokka/html build/pages_staging/api
            channels="$channels api"
          fi
          echo "channels=$channels" >> "$GITHUB_OUTPUT"

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