# Docs - Orchestrator
#
# Trigger paths:
#   push (main, release/**)  → metadata-regen → build-site → deploy-aws
#   pull_request              → detect-changes → pr-metadata-regen → link-check → build-site (if docs/source changed)
#   workflow_dispatch         → metadata-regen → build-site → deploy-aws
#
# Container jobs (pr-metadata-regen, metadata-regen) run in px4-dev image and
# require safe.directory + fetch-depth: 0 for git operations.

name: Docs - Orchestrator

on:
  push:
    branches:
      - "main"
      - "release/**"
    paths:
      - "docs/**"
      - "src/**"
      - "msg/**"
      - "ROMFS/**"
      - "Tools/module_config/**"
      - ".github/workflows/docs-orchestrator.yml"
  pull_request:
    paths:
      - "docs/**"
      - ".github/workflows/docs-orchestrator.yml"
  workflow_dispatch:

concurrency:
  group: docs-orchestrator-${{ github.ref }}
  cancel-in-progress: true

jobs:
  # =============================================================================
  # Detect Changes (PR only)
  # =============================================================================
  detect-changes:
    name: "T1: Detect Changes"
    if: github.event_name == 'pull_request'
    permissions:
      contents: read
    runs-on: ubuntu-latest
    outputs:
      source_changed: ${{ steps.changes.outputs.source }}
      docs_changed: ${{ steps.changes.outputs.docs }}
    steps:
      - uses: actions/checkout@v4
      - uses: dorny/paths-filter@v3
        id: changes
        with:
          filters: |
            source:
              - 'src/**'
              - 'msg/**'
              - 'ROMFS/**'
              - 'Tools/module_config/**'
            docs:
              - 'docs/**'

  # =============================================================================
  # PR Metadata Regen (conditional - only when PR touches source files)
  # =============================================================================
  pr-metadata-regen:
    name: "T2: PR Metadata"
    needs: [detect-changes]
    if: github.event_name == 'pull_request' && needs.detect-changes.outputs.source_changed == 'true'
    permissions:
      contents: read
    runs-on: [runs-on,runner=4cpu-linux-x64,image=ubuntu24-full-x64,"run-id=${{ github.run_id }}",spot=false,extras=s3-cache]
    container:
      image: px4io/px4-dev:v1.17.0-beta1
    steps:
      - uses: runs-on/action@v1

      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          submodules: recursive

      - name: Git ownership workaround
        run: git config --system --add safe.directory '*'

      - name: Cache Restore - ccache
        id: cache-ccache
        uses: actions/cache/restore@v4
        with:
          path: ~/.ccache
          key: ccache-docs-metadata-${{ github.sha }}
          restore-keys: |
            ccache-docs-metadata-

      - name: Setup ccache
        run: |
          mkdir -p ~/.ccache
          echo "max_size = 1G" > ~/.ccache/ccache.conf

      - name: Build px4_sitl_default
        run: |
          make px4_sitl_default
        env:
          CCACHE_DIR: ~/.ccache

      - name: Cache Save - ccache
        uses: actions/cache/save@v4
        if: always()
        with:
          path: ~/.ccache
          key: ccache-docs-metadata-${{ github.sha }}

      - name: Generate and sync metadata
        run: Tools/ci/metadata_sync.sh --generate --sync parameters airframes modules msg_docs failsafe_web
        env:
          CCACHE_DIR: ~/.ccache

      - name: Upload metadata artifact
        uses: actions/upload-artifact@v4
        with:
          name: pr-metadata
          path: docs/
          retention-days: 1

  # =============================================================================
  # Push Metadata Regen (main/release branches)
  # =============================================================================
  metadata-regen:
    name: "T2: Metadata Sync"
    if: github.event_name == 'push' || github.event_name == 'workflow_dispatch'
    permissions:
      contents: write
    runs-on: [runs-on,runner=4cpu-linux-x64,image=ubuntu24-full-x64,"run-id=${{ github.run_id }}",spot=false,extras=s3-cache]
    container:
      image: px4io/px4-dev:v1.17.0-beta1
    steps:
      - uses: runs-on/action@v1

      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          submodules: recursive
          token: ${{ secrets.PX4BUILTBOT_PERSONAL_ACCESS_TOKEN }}

      - name: Git ownership workaround
        run: git config --system --add safe.directory '*'

      - name: Cache Restore - ccache
        id: cache-ccache
        uses: actions/cache/restore@v4
        with:
          path: ~/.ccache
          key: ccache-docs-metadata-${{ github.sha }}
          restore-keys: |
            ccache-docs-metadata-

      - name: Setup ccache
        run: |
          mkdir -p ~/.ccache
          echo "max_size = 1G" > ~/.ccache/ccache.conf

      - name: Build px4_sitl_default
        run: |
          make px4_sitl_default
        env:
          CCACHE_DIR: ~/.ccache

      - name: Cache Save - ccache
        uses: actions/cache/save@v4
        if: always()
        with:
          path: ~/.ccache
          key: ccache-docs-metadata-${{ github.sha }}

      - name: Generate and sync metadata
        run: Tools/ci/metadata_sync.sh --generate --sync parameters airframes modules msg_docs failsafe_web
        env:
          CCACHE_DIR: ~/.ccache

      - name: Install Node.js and Yarn
        run: |
          curl -fsSL https://deb.nodesource.com/setup_20.x | bash -
          apt-get install -y nodejs
          corepack enable

      - name: Format markdown with Prettier
        run: |
          cd docs
          yarn install --frozen-lockfile
          yarn prettier --write "en/**/*.md"

      - name: Commit and push changes
        run: |
          git config --global user.name "${{ secrets.PX4BUILDBOT_USER }}"
          git config --global user.email "${{ secrets.PX4BUILDBOT_EMAIL }}"
          git add docs/
          if git diff --staged --quiet; then
            echo "No changes to commit"
          else
            git commit -m "docs: auto-sync metadata [skip ci]

            Co-Authored-By: PX4 BuildBot <${{ secrets.PX4BUILDBOT_EMAIL }}>"
            git push
          fi

  # =============================================================================
  # Link Check
  # =============================================================================
  link-check:
    name: "T2: Link Check"
    needs: [detect-changes, pr-metadata-regen]
    if: always() && (github.event_name == 'pull_request')
    permissions:
      contents: read
      pull-requests: write
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          ref: ${{ github.event.pull_request.head.sha }}
          fetch-depth: 0

      - name: Download metadata artifact
        if: needs.pr-metadata-regen.result == 'success'
        uses: actions/download-artifact@v4
        with:
          name: pr-metadata
          path: docs/

      - name: Get changed doc files
        id: changed-files
        uses: tj-actions/changed-files@v46.0.5
        with:
          json: true
          write_output_files: true
          output_dir: ./logs
          base_sha: ${{ github.event.pull_request.base.sha }}
          sha: ${{ github.event.pull_request.head.sha }}
          files: |
            docs/en/**/*.md

      - name: Save changed files list
        run: |
          mv ./logs/all_changed_files.json ./logs/prFiles.json
          echo "Changed files:"
          cat ./logs/prFiles.json

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: 20

      - name: Run filtered link checker (changed files)
        run: |
          npm -g install markdown_link_checker_sc@0.0.138
          if [ "$(jq length ./logs/prFiles.json)" -gt 0 ]; then
            markdown_link_checker_sc \
              -r "$GITHUB_WORKSPACE" \
              -d docs \
              -e en \
              -f ./logs/prFiles.json \
              -i assets \
              -u docs.px4.io/main/ \
              > ./logs/filtered-link-check-results.md || true
          fi
          if [ ! -s ./logs/filtered-link-check-results.md ]; then
            echo "No broken links found in changed files." > ./logs/filtered-link-check-results.md
          fi
          cat ./logs/filtered-link-check-results.md

      - name: Run full link checker
        run: |
          markdown_link_checker_sc \
            -r "$GITHUB_WORKSPACE" \
            -d docs \
            -e en \
            -i assets \
            -u docs.px4.io/main/ \
            > ./logs/link-check-results.md || true
          cat ./logs/link-check-results.md

      - name: Post PR comment with link check results
        if: github.event.pull_request.head.repo.full_name == github.repository
        uses: marocchino/sticky-pull-request-comment@v2
        with:
          header: flaws
          path: ./logs/filtered-link-check-results.md

      - name: Upload link check results
        uses: actions/upload-artifact@v4
        with:
          name: link-check-results
          path: logs/
          retention-days: 7

  # =============================================================================
  # Build Site
  # =============================================================================
  build-site:
    name: "T3: Build Site"
    needs: [detect-changes, pr-metadata-regen, metadata-regen, link-check]
    if: >-
      always() &&
      (needs.metadata-regen.result == 'success' || needs.metadata-regen.result == 'skipped') &&
      (needs.link-check.result == 'success' || needs.link-check.result == 'skipped') &&
      (github.event_name != 'pull_request' || needs.detect-changes.outputs.docs_changed == 'true' || needs.detect-changes.outputs.source_changed == 'true')
    permissions:
      contents: read
    runs-on: [runs-on,runner=4cpu-linux-x64,image=ubuntu24-full-x64,"run-id=${{ github.run_id }}",spot=false,extras=s3-cache]
    outputs:
      branchname: ${{ steps.set-branch.outputs.branchname }}
      releaseversion: ${{ steps.set-version.outputs.releaseversion }}
    steps:
      - uses: runs-on/action@v1

      - name: Checkout
        uses: actions/checkout@v4
        with:
          ref: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.sha || github.sha }}

      - name: Download metadata artifact (PR)
        if: github.event_name == 'pull_request' && needs.pr-metadata-regen.result == 'success'
        uses: actions/download-artifact@v4
        with:
          name: pr-metadata
          path: docs/

      - id: set-branch
        run: echo "branchname=${GITHUB_HEAD_REF:-${GITHUB_REF#refs/heads/}}" >> $GITHUB_OUTPUT

      - id: set-version
        run: |
          branch="${{ steps.set-branch.outputs.branchname }}"
          if [[ "$branch" == "main" ]]; then
            version="main"
          elif [[ "$branch" =~ ^release/ ]]; then
            version="v${branch#release/}"
          elif [[ "${{ github.event_name }}" == "pull_request" ]]; then
            version="main"
          else
            echo "::error::Unsupported branch for docs deploy: $branch (expected main or release/*)"
            exit 1
          fi
          echo "releaseversion=$version" >> $GITHUB_OUTPUT

      - name: Setup Node
        uses: actions/setup-node@v4
        with:
          node-version: 20
          cache: npm
          cache-dependency-path: ./docs/yarn.lock

      - name: Install dependencies
        run: yarn install --frozen-lockfile --cwd ./docs

      - name: Build with VitePress
        working-directory: ./docs
        env:
          BRANCH_NAME: ${{ steps.set-version.outputs.releaseversion }}
        run: |
          npm run docs:build_ubuntu
          touch .vitepress/dist/.nojekyll
          npm run docs:sitemap

      - name: Upload artifact
        uses: actions/upload-artifact@v4
        with:
          name: px4_docs_build
          path: docs/.vitepress/dist/
          retention-days: 1

  # =============================================================================
  # Deploy to AWS (push + workflow_dispatch)
  # =============================================================================
  deploy-aws:
    name: "T4: Deploy"
    needs: [metadata-regen, build-site]
    if: >-
      always() &&
      needs.metadata-regen.result == 'success' &&
      needs.build-site.result == 'success' &&
      (github.event_name == 'push' || github.event_name == 'workflow_dispatch')
    permissions:
      id-token: write
    runs-on: ubuntu-latest
    steps:
      - name: Download Artifact
        uses: actions/download-artifact@v4
        with:
          name: px4_docs_build
          path: ~/_book

      - name: Configure AWS from OIDC
        uses: aws-actions/configure-aws-credentials@v4
        with:
          role-to-assume: ${{ secrets.AWS_ROLE_ARN }}
          aws-region: us-west-2

      - name: Sanity check AWS credentials
        run: aws sts get-caller-identity

      - name: Upload HTML with short cache
        run: |
          aws s3 sync ~/_book/ s3://px4-docs/${{ needs.build-site.outputs.releaseversion }}/ \
            --delete \
            --exclude "*" --include "*.html" \
            --cache-control "public, max-age=60"

      - name: Upload assets with long cache
        run: |
          aws s3 sync ~/_book/ s3://px4-docs/${{ needs.build-site.outputs.releaseversion }}/ \
            --delete \
            --exclude "*.html" \
            --cache-control "public, max-age=86400, immutable"