name: Auto-close issues on release branch merge

on:
  push:
    branches:
      - 'release/**'

permissions:
  issues: write

jobs:
  close-issues:
    name: Close referenced issues
    runs-on: ubuntu-latest
    steps:
      - name: Scan commits and close issues
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          REPO: ${{ github.repository }}
          SHA: ${{ github.sha }}
        run: |
          # Collect all commit messages from the push event
          commits='${{ toJSON(github.event.commits) }}'

          # Extract issue numbers from Closes/Fixes patterns (case-insensitive)
          issues=$(echo "$commits" \
            | grep -ioE '(closes|fixes|close|fix|resolved|resolves)\s+#[0-9]+' \
            | grep -oE '[0-9]+' \
            | sort -u)

          if [ -z "$issues" ]; then
            echo "No issue references found in commit messages."
            exit 0
          fi

          branch="${GITHUB_REF#refs/heads/}"
          for issue in $issues; do
            echo "Closing issue #$issue (referenced in $branch @ ${SHA:0:7})"
            gh issue close "$issue" \
              --repo "$REPO" \
              --comment "Closed automatically — merged into \`$branch\` via ${SHA:0:7}." \
              || echo "Warning: could not close #$issue (may already be closed)"
          done