name: PR template guard (stale)

on:
  schedule:
    - cron: "0 3 * * *"
  workflow_dispatch:

permissions:
  contents: read
  pull-requests: write
  issues: write

env:
  LABEL: "incomplete template"
  GRACE_DAYS: 14

jobs:
  close:
    runs-on: ubuntu-latest
    if: github.repository == 'ikhsanddy/pixies'
    steps:
      - name: Close pull requests with an unfinished template
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          REPO: ${{ github.repository }}
        run: |
          cutoff=$(( $(date +%s) - GRACE_DAYS * 86400 ))

          gh pr list --repo "$REPO" --state open --label "$LABEL" --limit 100 \
            --json number,isDraft,author \
            --jq '.[] | select(.isDraft | not) | "\(.number) \(.author.login)"' > prs.txt

          while read -r number author; do
            [ -z "$number" ] && continue

            labeled_at=$(gh api --paginate "repos/$REPO/issues/$number/timeline" \
              --jq "[.[] | select(.event == \"labeled\" and .label.name == \"$LABEL\") | .created_at] | last")

            if [ -z "$labeled_at" ] || [ "$labeled_at" = "null" ]; then
              echo "PR #$number: no label event found, skipping."
              continue
            fi

            if [ "$(date -d "$labeled_at" +%s)" -gt "$cutoff" ]; then
              echo "PR #$number: still within the grace period."
              continue
            fi

            echo "PR #$number: labeled at $labeled_at, closing."

            {
              echo "<!-- pr-template-guard-stale -->"
              echo "Hey @$author, we haven't heard back on this one, so we're closing it for now."
              echo
              echo "The pull request template is still incomplete after $GRACE_DAYS days. Feel free to fill it in"
              echo "and reopen whenever you get the chance, we're happy to take another look."
            } > comment.md

            gh pr comment "$number" --repo "$REPO" --body-file comment.md
            gh pr close "$number" --repo "$REPO"
          done < prs.txt