# Workflow for deploying versioned documentation to GitHub Pages
name: Deploy Documentation

env:
    # Disable Husky Git hooks in CI to prevent local development hooks
    # (e.g., pre-commit formatting checks) from running during automated
    # workflows that perform git commits and pushes.
    HUSKY: 0

on:
  # Runs after Build & Test succeeds on main (publishes to /snapshot/)
  workflow_run:
    workflows: ["Build & Test"]
    types: [completed]
    branches: [main]

  # Runs on release publish (publishes to /latest/ and /vX.Y.Z/)
  release:
    types: [published]

  # Allows manual trigger
  workflow_dispatch:
    inputs:
      version:
        description: 'Specific version/tag to build (leave empty for snapshot from main)'
        type: string
        default: ''
      publish_as_latest:
        description: 'Also publish as latest?'
        type: boolean
        default: false
      rebuild_all_versions:
        description: 'Rebuild documentation for all release tags?'
        type: boolean
        default: false

# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
permissions:
  actions: read      # Required to download artifacts from Build & Test workflow
  contents: write
  pages: write
  id-token: write

# Allow only one concurrent deployment
concurrency:
  group: "pages"
  cancel-in-progress: false

jobs:
  build-and-deploy:
    # Skip if triggered by workflow_run that failed
    if: ${{ github.event_name != 'workflow_run' || github.event.workflow_run.conclusion == 'success' }}
    runs-on: ubuntu-latest
    environment:
      name: github-pages
      url: ${{ steps.deployment.outputs.page_url }}
    steps:
      - name: Checkout
        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
        with:
          fetch-depth: 0

      - name: Set up JDK 17
        uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # v5
        with:
          java-version: '17'
          distribution: 'temurin'
          cache: 'maven'

      - name: Checkout gh-pages branch
        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
        with:
          ref: gh-pages
          path: site
        continue-on-error: true

      - name: Initialize site if needed
        run: |
          if [ ! -d "site/.git" ]; then
            rm -rf site
            mkdir -p site
            cd site
            git init
            git checkout -b gh-pages
            git remote add origin "https://x-access-token:${{ secrets.GITHUB_TOKEN }}@github.com/${{ github.repository }}.git"
          fi

      - name: Get all release tags
        id: tags
        run: |
          # Get all tags that look like version numbers (v1.0.0 or 1.0.0)
          TAGS=$(git tag -l | grep -E '^v?[0-9]+\.[0-9]+' | sort -Vr)
          echo "all_tags<<EOF" >> $GITHUB_OUTPUT
          echo "$TAGS" >> $GITHUB_OUTPUT
          echo "EOF" >> $GITHUB_OUTPUT
          
          # Get the latest tag
          LATEST_TAG=$(echo "$TAGS" | head -n 1)
          echo "latest_tag=$LATEST_TAG" >> $GITHUB_OUTPUT
          
          # Determine what to build
          if [[ "${{ github.event_name }}" == "release" ]]; then
            echo "build_tag=${{ github.event.release.tag_name }}" >> $GITHUB_OUTPUT
            echo "is_release=true" >> $GITHUB_OUTPUT
          elif [[ -n "${{ inputs.version }}" ]]; then
            # Manual trigger with specific version
            VERSION="${{ inputs.version }}"
            # Add 'v' prefix if not present for tag lookup
            if [[ ! "$VERSION" =~ ^v ]]; then
              TAG="v$VERSION"
            else
              TAG="$VERSION"
            fi
            echo "build_tag=$TAG" >> $GITHUB_OUTPUT
            echo "is_release=true" >> $GITHUB_OUTPUT
          else
            echo "build_tag=" >> $GITHUB_OUTPUT
            echo "is_release=false" >> $GITHUB_OUTPUT
          fi

      - name: Download test results from Build & Test
        if: steps.tags.outputs.is_release == 'false' && inputs.rebuild_all_versions != true && github.event_name == 'workflow_run'
        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
        with:
          name: test-results-for-site
          path: /tmp/test-results
          run-id: ${{ github.event.workflow_run.id }}
          github-token: ${{ secrets.GITHUB_TOKEN }}
        continue-on-error: true

      - name: Build snapshot documentation (main branch)
        if: steps.tags.outputs.is_release == 'false' && inputs.rebuild_all_versions != true
        run: |
          # Compile sources (needed for javadoc and other reports)
          ./mvnw clean compile -DskipTests -Dcheckstyle.skip=true
          
          # Restore test results from Build & Test (for JaCoCo + Surefire reports)
          # upload-artifact strips the common ancestor (target/), so files are at root
          if [ -d "/tmp/test-results/surefire-reports" ]; then
            mkdir -p target/surefire-reports
            cp -r /tmp/test-results/surefire-reports/* target/surefire-reports/
            echo "Surefire reports restored"
          fi
          if [ -f "/tmp/test-results/jacoco-test-results/sdk-tests.exec" ]; then
            mkdir -p target/jacoco-test-results
            cp /tmp/test-results/jacoco-test-results/sdk-tests.exec target/jacoco-test-results/
            echo "JaCoCo exec restored"
          fi
          
          # Generate site (report plugins pick up the restored data)
          ./mvnw site -DskipTests -Dcheckstyle.skip=true
          
          rm -rf "site/snapshot"
          mkdir -p "site/snapshot"
          cp -r target/site/* "site/snapshot/"

      - name: Build documentation for specific version
        if: steps.tags.outputs.is_release == 'true' && inputs.rebuild_all_versions != true
        run: |
          TAG="${{ steps.tags.outputs.build_tag }}"
          VERSION="${TAG#v}"  # Remove 'v' prefix
          
          echo "Building documentation for $TAG (version $VERSION)"
          git checkout "$TAG"
          
          ./mvnw clean site -DskipTests -Dcheckstyle.skip=true
          
          rm -rf "site/$VERSION"
          mkdir -p "site/$VERSION"
          cp -r target/site/* "site/$VERSION/"
          
          # Update /latest/ if this is a release event or publish_as_latest is true
          if [[ "${{ github.event_name }}" == "release" ]] || [[ "${{ inputs.publish_as_latest }}" == "true" ]]; then
            rm -rf "site/latest"
            mkdir -p "site/latest"
            cp -r target/site/* "site/latest/"
          fi
          
          git checkout main

      - name: Build documentation for all release tags
        if: inputs.rebuild_all_versions == true
        run: |
          LATEST_TAG="${{ steps.tags.outputs.latest_tag }}"
          
          while IFS= read -r TAG; do
            if [[ -z "$TAG" ]]; then continue; fi
            
            VERSION="${TAG#v}"  # Remove 'v' prefix
            echo "Building documentation for $TAG (version $VERSION)"
            
            git checkout "$TAG"
            ./mvnw clean site -DskipTests -Dcheckstyle.skip=true
            
            rm -rf "site/$VERSION"
            mkdir -p "site/$VERSION"
            cp -r target/site/* "site/$VERSION/"
            
            # If this is the latest tag, also update /latest/
            if [[ "$TAG" == "$LATEST_TAG" ]]; then
              rm -rf "site/latest"
              mkdir -p "site/latest"
              cp -r target/site/* "site/latest/"
            fi
            
          done <<< "${{ steps.tags.outputs.all_tags }}"
          
          # Return to main and build snapshot
          git checkout main
          ./mvnw clean site -DskipTests -Dcheckstyle.skip=true
          
          rm -rf "site/snapshot"
          mkdir -p "site/snapshot"
          cp -r target/site/* "site/snapshot/"

      - name: Copy version index page
        run: |
          cp .github/templates/index.html site/index.html
          cp .github/templates/styles.css site/styles.css

      - name: Update version list from git tags
        run: |
          cd site
          
          REPO_URL="https://github.com/github/copilot-sdk-java"
          
          # Get versions from git tags (already sorted by version, descending)
          VERSIONS=$(git -C .. tag -l | grep -E '^v?[0-9]+\.[0-9]+' | sed 's/^v//' | sort -Vr)
          HAS_SNAPSHOT=$([ -d "snapshot" ] && echo "true" || echo "false")
          
          # Generate version links
          CURRENT_HTML=""
          OLDER_HTML=""
          IS_FIRST_VERSION="true"
          
          # Add snapshot if exists (goes to current versions)
          if [ "$HAS_SNAPSHOT" = "true" ]; then
            CURRENT_HTML+='<li><span class="version-name">Development (main branch)</span><span class="version-links"><a href="./snapshot/" class="doc-link">documentation ↗</a><a href="'"$REPO_URL"'/blob/main/CHANGELOG.md" class="release-link">changelog ↗</a><span class="badge snapshot">snapshot</span></span></li>'
          fi
          
          # Add versioned releases from tags (first one is latest, rest go to older)
          for v in $VERSIONS; do
            if [ -d "$v" ]; then
              if [ "$IS_FIRST_VERSION" = "true" ]; then
                CURRENT_HTML+='<li class="latest-version"><span class="version-name">Version '"$v"'</span><span class="version-links"><a href="./'"$v"'/" class="doc-link">documentation ↗</a><a href="'"$REPO_URL"'/releases/tag/v'"$v"'" class="release-link">release notes ↗</a><span class="badge latest">latest</span></span></li>'
                IS_FIRST_VERSION="false"
              else
                OLDER_HTML+='<li><span>'"$v"'</span><span class="older-links"><a href="./'"$v"'/" class="doc-link">documentation ↗</a><a href="'"$REPO_URL"'/releases/tag/v'"$v"'" class="release-link">release notes ↗</a></span></li>'
              fi
            fi
          done
          
          # Update the index.html using the placeholders
          sed -i "s|<!-- CURRENT_VERSIONS_PLACEHOLDER -->|$CURRENT_HTML|" index.html
          sed -i "s|<!-- OLDER_VERSIONS_PLACEHOLDER -->|$OLDER_HTML|" index.html

      - name: Overlay custom JaCoCo CSS
        run: |
          cd site
          for dir in */jacoco/jacoco-resources; do
            if [ -d "$dir" ]; then
              cp ../src/site/jacoco-resources/report.css "$dir/report.css"
              echo "Overlaid JaCoCo CSS in $dir"
            fi
          done

      - name: Deploy to GitHub Pages
        run: |
          cd site
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          
          # Set remote URL with token for authentication
          git remote set-url origin "https://x-access-token:${{ secrets.GITHUB_TOKEN }}@github.com/${{ github.repository }}.git" 2>/dev/null || \
            git remote add origin "https://x-access-token:${{ secrets.GITHUB_TOKEN }}@github.com/${{ github.repository }}.git"
          
          git add -A
          
          # Create descriptive commit message
          if [[ "${{ inputs.rebuild_all_versions }}" == "true" ]]; then
            COMMIT_MSG="Rebuild documentation for all versions"
          elif [[ "${{ steps.tags.outputs.is_release }}" == "true" ]]; then
            COMMIT_MSG="Deploy documentation: ${{ steps.tags.outputs.build_tag }}"
          else
            COMMIT_MSG="Deploy documentation: snapshot"
          fi
          
          git diff --staged --quiet || git commit -m "$COMMIT_MSG"
          
          # Push, creating the branch if it doesn't exist
          git push -u origin gh-pages --force
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Setup Pages
        uses: actions/configure-pages@983d7736d9b0ae728b81ab479565c72886d7745b # v5

      - name: Upload artifact
        uses: actions/upload-pages-artifact@7b1f4a764d45c48632c6b24a0339c27f5614fb0b # v4
        with:
          path: 'site'

      - name: Deploy to GitHub Pages
        id: deployment
        uses: actions/deploy-pages@d6db90164ac5ed86f2b6aed7e0febac5b3c0c03e # v4