name: pr-closer

on:
  schedule:
    - cron: "0 0 * * *" # daily at midnight
  workflow_dispatch:

concurrency:
  group: pr-closer
  cancel-in-progress: true

jobs:
  close-stale-prs:
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
      checks: read
      statuses: read
    steps:
      - name: Close stale PRs
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          REPO: ${{ github.repository }}
        run: |
          set -o pipefail
          CUTOFF=$(date -u -d '6 days ago' +%Y-%m-%d)
          gh pr list -R "$REPO" --state open --search "updated:<$CUTOFF -author:jdx -label:keep-open draft:false" --json number,mergeStateStatus,statusCheckRollup --limit 500 | \
          jq -r '
            def failed_check:
              (.statusCheckRollup | length > 0) and
              ([.statusCheckRollup // [] | .[] | ((.conclusion // .state // "") | ascii_upcase)] | any(. == "FAILURE" or . == "ERROR" or . == "TIMED_OUT" or . == "ACTION_REQUIRED"));

            .[]
            | failed_check as $failed
            | ([.statusCheckRollup // [] | .[] | ((.conclusion // .state // "") | ascii_upcase)] | any(. == "CANCELLED")) as $cancelled
            | (.mergeStateStatus == "DIRTY") as $conflicted
            | (.mergeStateStatus == "UNKNOWN") as $unknown
            | if $failed and $conflicted then [.number, "failing checks and merge conflicts"]
              elif $failed then [.number, "failing checks"]
              elif $conflicted then [.number, "merge conflicts"]
              elif $cancelled then [.number, "cancelled checks", "warn"]
              elif $unknown then [.number, "unknown merge state", "warn"]
              else empty
              end
            | @tsv
          ' | \
          while IFS=$'\t' read -r pr reason action; do
            if [ "$action" = "warn" ]; then
              echo "Skipping PR #$pr ($reason)"
              continue
            fi
            echo "Closing PR #$pr ($reason)"
            gh pr close "$pr" -R "$REPO" -c "This PR has been inactive for at least 7 days and currently has $reason. Feel free to reopen or create a new PR if you'd like to continue working on this." || echo "Warning: failed to close PR #$pr, skipping"
          done