# Generated file. DO NOT EDIT.
name: Check for NEXT_CHANGELOG.md Changes

on:
  # Use pull_request_target to have access to GitHub API
  pull_request_target:

jobs:
  check-next-changelog:
    runs-on:
      group: databricks-deco-testing-runner-group
      labels: ubuntu-latest-deco

    steps:
      - name: Checkout code
        uses: actions/checkout@v3

      - name: Fetch list of changed files
        id: changed-files
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          # Use the GitHub API to fetch changed files
          files=$(gh pr view ${{ github.event.pull_request.number }} --json files -q '.files[].path')
          
          # Sanitize to avoid code injection
          sanitized_files=$(echo "$files" | sed 's/[^a-zA-Z0-9._/-]/_/g')
          
          # Store the sanitized list of files in a temporary file to avoid env variable issues
          echo "$sanitized_files" > modified_files.txt

      - name: Fetch PR message
        id: pr-message
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          # Use the GitHub API to fetch the PR message
          pr_message=$(gh pr view ${{ github.event.pull_request.number }} --json body -q '.body')
          
          # Sanitize the PR message to avoid code injection, keeping the equal sign
          sanitized_pr_message=$(echo "$pr_message" | sed 's/[^a-zA-Z0-9._/-=]/_/g')
          
          # Store the sanitized PR message
          echo "$sanitized_pr_message" > pr_message.txt

      - name: Verify NEXT_CHANGELOG.md was modified or PR message contains NO_CHANGELOG=true
        run: |
          # Read the sanitized files and PR message from the temporary files
          modified_files=$(cat modified_files.txt)
          pr_message=$(cat pr_message.txt)
          
          # Check if NEXT_CHANGELOG.md exists in the list of changed files
          echo "Changed files: $modified_files"
          if ! echo "$modified_files" | grep -q "NEXT_CHANGELOG.md"; then
            echo "NEXT_CHANGELOG.md not modified."
          
            # Check if PR message contains NO_CHANGELOG=true
            if echo "$pr_message" | grep -q "NO_CHANGELOG=true"; then
              echo "NO_CHANGELOG=true found in PR message. Skipping changelog check."
              exit 0
            else
              echo "WARNING: file NEXT_CHANGELOG.md not changed. If this is expected, add NO_CHANGELOG=true to the PR message."
              exit 1
            fi
          fi

      - name: Comment on PR with instructions if needed
        if: failure() # This step will only run if the previous step fails (i.e., if NEXT_CHANGELOG.md was not modified and NO_CHANGELOG=true was not in the PR message)
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          # Check if a comment exists with the instructions
          previous_comment_ids=$(gh api "repos/${{ github.repository }}/issues/${{ github.event.pull_request.number }}/comments" \
            --jq '.[] | select(.body | startswith("<!-- NEXT_CHANGELOG_INSTRUCTIONS -->")) | .id')
          echo "Previous comment IDs: $previous_comment_ids"

          # If no previous comment exists, add one with instructions
          if [ -z "$previous_comment_ids" ]; then
            echo "Adding instructions comment."
            gh pr comment ${{ github.event.pull_request.number }} --body \
            "<!-- NEXT_CHANGELOG_INSTRUCTIONS -->
            Please ensure that the NEXT_CHANGELOG.md file is updated with any relevant changes. 
            If this is not necessary for your PR, please include the following in your PR description:
            NO_CHANGELOG=true
            and rerun the job."
          fi

      - name: Delete instructions comment on success
        if: success() # This step will only run if the previous check passed (i.e., if NEXT_CHANGELOG.md was modified or NO_CHANGELOG=true is in the PR message)
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          # Check if there is a previous instructions comment
          previous_comment_ids=$(gh api "repos/${{ github.repository }}/issues/${{ github.event.pull_request.number }}/comments" \
            --jq '.[] | select(.body | startswith("<!-- NEXT_CHANGELOG_INSTRUCTIONS -->")) | .id')
          
            # If a comment exists, delete it
            if [ -n "$previous_comment_ids" ]; then
              echo "Deleting previous instructions comment."
              for comment_id in $previous_comment_ids; do
                gh api "repos/${{ github.repository }}/issues/comments/$comment_id" --method DELETE
              done
            else
              echo "No instructions comment found to delete."
            fi