# CodeRabbit threads: every review thread CodeRabbit opens gets an answer
# before a gate ask (Sam, 2026-10-24, #2605). An answer is a reply inside the
# thread from anyone but CodeRabbit, the only form CodeRabbit reads. A PR
# comment never counts, not even one quoting the thread's link (D199,
# 2026-10-30): seats had turned those into letters CodeRabbit never sees. A
# review body never counts either. Resolved and outdated threads don't count.
# Fork PRs are skipped entirely.
#
# Reported as the commit status `coderabbit-threads` on the PR head, not as
# this workflow's own check, so the result always lands on the head commit.
# NOT a required check. It never checks out PR code, so the write token only
# reaches the statuses API.
name: CodeRabbit threads

on:
  pull_request:
    types: [opened, synchronize, reopened, ready_for_review]
  pull_request_review:
  # `deleted` too: removing the only reply must re-fail the status rather
  # than leave a stale success on the head.
  pull_request_review_comment:
    types: [created, edited, deleted]

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

# No `concurrency:` on purpose (TASK-472). Runs started by a push, review or
# review comment attach their `count` check to the PR head, and a run that a
# concurrency group cancels, or a pending one it replaces, stays on the head as
# a CANCELLED check that reads as red after the threads are answered. Each run
# reads the threads fresh and finishes in seconds, so order is settled at post
# time instead: a run skips posting when the head's status already came from a
# newer run (a higher run id started later and read newer thread state).

jobs:
  count:
    runs-on: ubuntu-latest
    timeout-minutes: 3
    env:
      GH_TOKEN: ${{ github.token }}
      PR: ${{ github.event.pull_request.number }}
      REPO: ${{ github.repository }}
    steps:
      - name: Count unanswered CodeRabbit threads
        run: |
          set -euo pipefail
          owner="${REPO%/*}"; name="${REPO#*/}"
          gh api "repos/$REPO/pulls/$PR" > pr.json
          # Fork PRs get no action at all (don't rely on a token error).
          if [ "$(jq -r .head.repo.full_name pr.json)" != "$REPO" ]; then
            echo "Fork PR: not counted, no status posted."; exit 0
          fi
          head=$(jq -r .head.sha pr.json)
          # Every thread page; replies are read 100 deep per thread, and a
          # thread with more than that and no visible reply is counted as
          # INCOMPLETE rather than answered or unanswered.
          gh api graphql --paginate --slurp -F owner="$owner" -F name="$name" -F pr="$PR" -f query='
            query($owner:String!,$name:String!,$pr:Int!,$endCursor:String){repository(owner:$owner,name:$name){pullRequest(number:$pr){
              reviewThreads(first:100,after:$endCursor){pageInfo{hasNextPage endCursor} nodes{isResolved isOutdated
                comments(first:100){pageInfo{hasNextPage} nodes{author{login} databaseId url}}}}}}}' \
            | jq '[.[].data.repository.pullRequest.reviewThreads.nodes[]]' > threads.json
          # An answer is an in-thread reply from anyone but CodeRabbit. PR
          # comments and review bodies are not read at all. A deleted account
          # comes back as `author: null`; `// ""` keeps jq from exiting before
          # the status posts, and counts that reply as an answer.
          jq -r '.[]
            | select(.isResolved|not) | select(.isOutdated|not)
            | select((.comments.nodes[0].author.login // "") | test("^coderabbitai"))
            | select([.comments.nodes[1:][] | select((.author.login // "") | test("^coderabbitai")|not)] | length == 0)
            | "\(.comments.nodes[0].databaseId) \(.comments.pageInfo.hasNextPage) \(.comments.nodes[0].url)"' threads.json > open.txt
          : > unanswered.txt; : > incomplete.txt
          while read -r _id more url; do
            if [ "$more" = true ]; then echo "$url" >> incomplete.txt; else echo "$url" >> unanswered.txt; fi
          done < open.txt
          n=$(wc -l < unanswered.txt | tr -d ' '); m=$(wc -l < incomplete.txt | tr -d ' ')
          if [ "$n" != 0 ]; then state=failure; desc="$n unanswered CodeRabbit thread(s): reply inside each thread"
          elif [ "$m" != 0 ]; then state=failure; desc="$m CodeRabbit thread(s) too long to read fully: check them by hand"
          else state=success; desc="All CodeRabbit threads answered"; fi
          echo "### $desc" >> "$GITHUB_STEP_SUMMARY"
          sed 's/^/- /' unanswered.txt incomplete.txt >> "$GITHUB_STEP_SUMMARY"
          cat unanswered.txt incomplete.txt
          # Newest run wins: the status's target_url carries the run id that posted it.
          posted=$(gh api "repos/$REPO/commits/$head/status" \
            -q '[.statuses[] | select(.context == "coderabbit-threads" and .target_url != null) | .target_url | capture("/runs/(?<id>[0-9]+)").id | tonumber] | max // 0')
          if [ "$posted" -gt "$GITHUB_RUN_ID" ]; then
            echo "Run $posted already posted a newer result on $head; not overwriting it."; exit 0
          fi
          gh api -X POST "repos/$REPO/statuses/$head" -f state="$state" -f context=coderabbit-threads \
            -f description="${desc:0:140}" -f target_url="$GITHUB_SERVER_URL/$REPO/actions/runs/$GITHUB_RUN_ID" > /dev/null