name: Update OpenAPI Spec

on:
  schedule:
    - cron: "0 20 * * 1" # Monday 4pm EST
  workflow_dispatch:     # Allow manual trigger

permissions:
  contents: write
  pull-requests: write

jobs:
  check-openapi-updates:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Install jq
        run: sudo apt-get install -y jq

      - name: Check if there is already an open pull request
        id: check_pull_request
        run: |
          if [[ -n $(gh pr list --state open --repo ${{ github.repository }} | grep "docs: OpenAPI spec") ]]; then
            echo "There is already an open PR with updates to the OpenAPI spec. Merge or close that PR first. Skipping."
            echo "pr_exists=true" >> $GITHUB_OUTPUT
          else
            echo "pr_exists=false" >> $GITHUB_OUTPUT
          fi
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Run Langflow container and get OpenAPI spec
        if: steps.check_pull_request.outputs.pr_exists != 'true'
        run: |
          # Start the container in the background
          docker run -d --name langflow -p 7860:7860 langflowai/langflow:latest

          # Wait for the service to be ready (adjust timeout as needed)
          echo "Waiting for Langflow to start..."
          timeout=60
          elapsed=0
          while ! curl -s http://localhost:7860/health > /dev/null; do
            sleep 2
            elapsed=$((elapsed+2))
            if [ "$elapsed" -ge "$timeout" ]; then
              echo "Timed out waiting for Langflow to start"
              exit 1
            fi
            echo "Still waiting... ($elapsed seconds)"
          done

          # Get the OpenAPI spec and save to file
          echo "Fetching OpenAPI spec..."
          curl -s http://localhost:7860/openapi.json > new_openapi.json

          # Verify file was created
          ls -la new_openapi.json

          # stop the container when done
          docker stop langflow

      - name: Compare OpenAPI files
        if: steps.check_pull_request.outputs.pr_exists != 'true'
        id: compare
        run: |
          # Extract versions
          NEW_VERSION=$(jq -r '.info.version' new_openapi.json)
          CURRENT_VERSION=$(jq -r '.info.version' docs/openapi.json)

          echo "Current version: $CURRENT_VERSION"
          echo "New version: $NEW_VERSION"

          # Compare file content (normalize by sorting keys)
          jq --sort-keys . new_openapi.json > sorted_new.json
          jq --sort-keys . docs/openapi.json > sorted_current.json

          if ! cmp -s sorted_new.json sorted_current.json; then
            echo "OpenAPI spec content has changed."

            # Compare versions (assuming semantic versioning)
            if [ "$(printf '%s\n' "$CURRENT_VERSION" "$NEW_VERSION" | sort -V | tail -n1)" == "$NEW_VERSION" ] && [ "$CURRENT_VERSION" != "$NEW_VERSION" ]; then
              echo "New version detected. Creating PR."
              echo "NEEDS_UPDATE=true" >> $GITHUB_ENV
              echo "NEW_VERSION=$NEW_VERSION" >> $GITHUB_ENV
              echo "UPDATE_REASON=version upgraded from $CURRENT_VERSION to $NEW_VERSION" >> $GITHUB_ENV
            else
              echo "File content changed but version remains the same. Creating PR."
              echo "NEEDS_UPDATE=true" >> $GITHUB_ENV
              echo "NEW_VERSION=$CURRENT_VERSION" >> $GITHUB_ENV
              echo "UPDATE_REASON=content updated without version change" >> $GITHUB_ENV
            fi

            cat new_openapi.json | jq > docs/openapi.json
          else
            echo "No changes detected in OpenAPI spec content."
            echo "NEEDS_UPDATE=false" >> $GITHUB_ENV
          fi

          # Clean up
          rm new_openapi.json sorted_new.json sorted_current.json

      - name: Create Pull Request
        if: env.NEEDS_UPDATE == 'true' && steps.check_pull_request.outputs.pr_exists != 'true'
        uses: peter-evans/create-pull-request@v7
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          commit-message: "docs: OpenAPI spec ${{ env.UPDATE_REASON }}"
          title: "docs: OpenAPI spec ${{ env.UPDATE_REASON }}"
          body: |
            This PR updates the OpenAPI spec.

            Update reason: ${{ env.UPDATE_REASON }}
            Version: ${{ env.NEW_VERSION }}
          branch: update-openapi-spec
          branch-suffix: timestamp
          delete-branch: true
          reviewers: mendonk