name: Sync Frontend

on:
  workflow_dispatch:
  repository_dispatch:
    types:
      - frontend_release_published

concurrency:
  group: sync-frontend
  cancel-in-progress: false

permissions:
  contents: read

jobs:
  sync:
    name: Download & Sync
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          ref: main
          token: ${{ secrets.MAIN_REPO_TOKEN }}

      - name: Download latest frontend dist
        run: |
          gh release download latest \
            --repo HuangYuChuh/ComfyUI_Skills_OpenClaw-frontend \
            --pattern "frontend-dist.tar.gz" \
            --output frontend-dist.tar.gz
        env:
          GH_TOKEN: ${{ secrets.MAIN_REPO_TOKEN }}

      - name: Extract dist to ui/static
        run: |
          rm -rf ui/static/assets ui/static/index.html
          mkdir -p ui/static
          tar -xzf frontend-dist.tar.gz -C ui/static

      - name: Read frontend version
        id: version
        run: |
          FRONTEND_SHA=$(python - <<'PY'
          import json
          from pathlib import Path

          version = json.loads(Path("ui/static/version.json").read_text(encoding="utf-8"))
          print(version.get("commit", "").strip())
          PY
          )

          if [ -z "$FRONTEND_SHA" ]; then
            echo "Failed to read commit from ui/static/version.json" >&2
            exit 1
          fi

          echo "full_sha=$FRONTEND_SHA" >> "$GITHUB_OUTPUT"
          echo "short_sha=${FRONTEND_SHA:0:8}" >> "$GITHUB_OUTPUT"

      - name: Check for changes
        id: diff
        run: |
          git add ui/static/
          if git diff --cached --quiet; then
            echo "changed=false" >> $GITHUB_OUTPUT
          else
            echo "changed=true" >> $GITHUB_OUTPUT
          fi

      - name: Commit, open PR and enable auto-merge
        if: steps.diff.outputs.changed == 'true'
        env:
          GH_TOKEN: ${{ secrets.MAIN_REPO_TOKEN }}
          FRONTEND_SHA: ${{ steps.version.outputs.full_sha }}
          FRONTEND_SHORT_SHA: ${{ steps.version.outputs.short_sha }}
        run: |
          retry() {
            local attempts=$1
            shift
            local n=1
            while true; do
              if "$@"; then
                return 0
              fi
              if [ "$n" -ge "$attempts" ]; then
                return 1
              fi
              n=$((n + 1))
              sleep 3
            done
          }

          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"

          BRANCH="build/frontend-${FRONTEND_SHORT_SHA}"
          git checkout -B "$BRANCH"
          git commit -m "build(ui): sync frontend assets from upstream@${FRONTEND_SHORT_SHA}"
          git push --force-with-lease origin "$BRANCH"

          PR_URL=""
          if ! PR_URL=$(retry 3 gh pr create \
            --title "build(ui): sync frontend assets from upstream@${FRONTEND_SHORT_SHA}" \
            --body "Auto-generated by \`sync-frontend\` workflow for frontend commit \`${FRONTEND_SHA}\`." \
            --base main); then
            PR_URL=$(gh pr list \
              --head "$BRANCH" \
              --base main \
              --state open \
              --json url \
              --jq '.[0].url')
          fi

          if [ -z "$PR_URL" ]; then
            echo "Failed to create or find pull request for $BRANCH" >&2
            exit 1
          fi

          retry 3 gh pr merge "$PR_URL" --auto --squash

      - name: No changes
        if: steps.diff.outputs.changed == 'false'
        run: echo "Frontend is already up to date. Nothing to sync."