name: sync-docker-agent-docs

on:
  schedule:
    # Run daily at 02:30 UTC, offset from sync-cli-docs
    - cron: '30 2 * * *'
  workflow_dispatch:
    inputs:
      version:
        description: "(optional) docker-agent version - defaults to the latest release tag"
        required: false
        default: ""
  pull_request:
    paths:
      - '.github/workflows/sync-docker-agent-docs.yml'

permissions:
  contents: write
  pull-requests: write

env:
  BRANCH_NAME: "bot/sync-docker-agent-docs"
  MODULE_NAME: "github.com/docker/docker-agent"

jobs:
  sync-docker-agent-docs:
    runs-on: ubuntu-24.04
    steps:
      -
        name: Checkout docs repo
        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
        with:
          fetch-depth: 0
      -
        name: Get target version
        id: get-version
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          if [ -n "${{ inputs.version }}" ]; then
            VERSION="${{ inputs.version }}"
          else
            VERSION=$(gh release view --repo docker/docker-agent --json tagName --jq .tagName)
          fi
          CURRENT=$(go list -m -f '{{ .Version }}' "$MODULE_NAME" || true)

          echo "version=$VERSION" >> "$GITHUB_OUTPUT"
          echo "current=$CURRENT" >> "$GITHUB_OUTPUT"
          echo "docker-agent version: **$VERSION** (currently pinned: **$CURRENT**)" | tee -a "$GITHUB_STEP_SUMMARY"
      -
        name: Set up Docker Buildx
        if: steps.get-version.outputs.version != steps.get-version.outputs.current
        uses: docker/setup-buildx-action@4d04d5d9486b7bd6fa91e7baf45bbb4f8b9deedd # v4
      -
        # go mod edit sets the version before plain make vendor: passing
        # VENDOR_MODULE would run hugo mod get, which records docker-agent's
        # full transitive graph as indirect requires in go.mod.
        name: Update vendor
        if: steps.get-version.outputs.version != steps.get-version.outputs.current
        run: |
          go mod edit -require "${MODULE_NAME}@${{ steps.get-version.outputs.version }}"
          make vendor
      -
        name: Detect changes
        id: changes
        if: steps.get-version.outputs.version != steps.get-version.outputs.current
        run: |
          if [ -n "$(git status --porcelain)" ]; then
            echo "changes=true" >> "$GITHUB_OUTPUT"
            echo "Changes detected - syncing Docker Agent docs" >> "$GITHUB_STEP_SUMMARY"
          else
            echo "changes=false" >> "$GITHUB_OUTPUT"
            echo "No changes to sync - Docker Agent docs are up to date" >> "$GITHUB_STEP_SUMMARY"
          fi
      -
        name: Commit changes
        if: steps.changes.outputs.changes == 'true'
        env:
          BRANCH_NAME: ${{ env.BRANCH_NAME }}
          VERSION: ${{ steps.get-version.outputs.version }}
        run: |
          git checkout -b "$BRANCH_NAME"
          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
          git add -A
          git commit -m "docker-agent: sync docs with docker-agent $VERSION"
      -
        name: Create or update Pull Request
        if: steps.changes.outputs.changes == 'true' && github.event_name != 'pull_request'
        env:
          GH_TOKEN: ${{ github.token }}
          BRANCH_NAME: ${{ env.BRANCH_NAME }}
          PR_TITLE: "docker-agent: sync docs with docker-agent ${{ steps.get-version.outputs.version }}"
          PR_BODY: |
            ## Summary

            Automated sync of Docker Agent documentation from the docker/docker-agent repository.

            **docker-agent version:** ${{ steps.get-version.outputs.version }}

            ---

            > [!IMPORTANT]
            > **Reviewer:** Please close and reopen this PR to trigger CI checks.
            > See: https://docs.github.com/en/actions/how-tos/write-workflows/choose-when-workflows-run/trigger-a-workflow#triggering-a-workflow-from-a-workflow
        run: |
          # Check for existing open PR from this branch
          EXISTING_PR=$(gh pr list --state open --head "$BRANCH_NAME" --json url --jq ".[0].url // empty")

          if [ -n "$EXISTING_PR" ]; then
            echo "Updating existing PR: $EXISTING_PR" >> "$GITHUB_STEP_SUMMARY"
            git push -u origin "$BRANCH_NAME" --force
            gh pr edit "$EXISTING_PR" --title "$PR_TITLE" --body "$PR_BODY"
          else
            # Check if a closed PR with the same title already exists
            CLOSED_PR=$(gh pr list --state closed --search "$PR_TITLE in:title" --json url --jq ".[0].url // empty")
            if [ -n "$CLOSED_PR" ]; then
              echo "A closed PR already exists for this version: $CLOSED_PR" >> "$GITHUB_STEP_SUMMARY"
              echo "Skipping PR creation."
              exit 0
            fi

            echo "Creating new PR" >> "$GITHUB_STEP_SUMMARY"
            git push -u origin "$BRANCH_NAME"
            gh pr create \
              --title "$PR_TITLE" \
              --body "$PR_BODY" \
              --base main \
              --head "$BRANCH_NAME"
          fi