name: 5.x Changelog check

on:
  pull_request:
    types: [opened, synchronize, reopened, ready_for_review, labeled, unlabeled]

jobs:
  changelog_check:
    runs-on: codebuild-github-actions-codebuild-runner-devops-amd-${{ github.run_id }}-${{ github.run_attempt }}
    if: ${{ github.event_name == 'pull_request' && !github.event.pull_request.draft && !contains(github.event.pull_request.labels.*.name, 'no-changelog') }}

    permissions:
      contents: read

    steps:
      - name: Checkout repository
        uses: actions/checkout@v6
        with:
          fetch-depth: 0

      - name: Validate CHANGELOG.md changes
        env:
          BASE_REF: ${{ github.base_ref }}
        run: |
          UPDATED="✅" FORMAT="—" INVALID=""

          ADDED=$(git diff -U0 "origin/${BASE_REF}...HEAD" -- CHANGELOG.md | grep -E '^\+[^+]' | sed 's/^+//' || true)
          if [ -z "$ADDED" ]; then
            UPDATED="❌"
            echo "::error::CHANGELOG.md was not updated with new entries. Add one or add the 'no-changelog' label to skip this check."
          else
            FORMAT="✅"

            ENTRY_REGEX='^- .+ \(\[#[0-9]+\]\(https://github\.com/[^)]+/(issues|pull)/[0-9]+\)\)$'
            INVALID=$(echo "$ADDED" | grep -E '^- ' | grep -vx -- '- None' | grep -vE "$ENTRY_REGEX" || true)
            if [ -n "$INVALID" ]; then
              FORMAT="❌"
              echo "::error::Invalid CHANGELOG.md entries. Expected format: '- Description ([#123](https://github.com/<org>/<repo>/issues/123))'. Offending lines:"
              echo "$INVALID"
            fi
          fi

          {
            echo "## Changelog check"
            echo ""
            echo "| Check | Result |"
            echo "|---|---|"
            echo "| CHANGELOG.md has new entries | $UPDATED |"
            echo "| Entry format | $FORMAT |"
            if [ -n "$INVALID" ]; then
              echo ""
              echo "Offending lines:"
              echo '```'
              echo "$INVALID"
              echo '```'
            fi
          } >> "$GITHUB_STEP_SUMMARY"

          if [ "$UPDATED" != "✅" ] || [ "$FORMAT" != "✅" ]; then
            exit 1
          fi
          echo "CHANGELOG.md update is valid."