name: Validate README.md

on:
  pull_request:
    types: [opened, synchronize, reopened]
    paths:
      - "instructions/**"
      - "prompts/**"
      - "chatmodes/**"
      - "*.js"

jobs:
  validate-readme:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

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

      - name: Update README.md
        run: node update-readme.js

      - name: Check for README.md changes
        id: check-diff
        run: |
          if git diff --exit-code README.md; then
            echo "No changes to README.md after running update script."
            echo "status=success" >> $GITHUB_OUTPUT
          else
            echo "Changes detected in README.md after running update script."
            echo "status=failure" >> $GITHUB_OUTPUT
            echo "diff<<EOF" >> $GITHUB_OUTPUT
            git diff README.md >> $GITHUB_OUTPUT
            echo "EOF" >> $GITHUB_OUTPUT
          fi

      - name: Comment on PR if README.md needs updating
        if: steps.check-diff.outputs.status == 'failure'
        uses: actions/github-script@v7
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const diff = `${{ steps.check-diff.outputs.diff }}`;
            const body = `## ⚠️ README.md needs to be updated

            The \`update-readme.js\` script detected changes that need to be made to the README.md file.

            Please run \`node update-readme.js\` locally and commit the changes before merging this PR.

            <details>
              <summary>View diff</summary>
              
              \`\`\`diff
              ${diff}
              \`\`\`
            </details>`;

            github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
              body: body
            });

      - name: Fail workflow if README.md needs updating
        if: steps.check-diff.outputs.status == 'failure'
        run: |
          echo "❌ README.md needs to be updated. Please run 'node update-readme.js' locally and commit the changes."
          exit 1