#!/usr/bin/env bash
# review-poll.sh — Poll open PRs and review those with green CI
#
# Usage: ./scripts/review-poll.sh
#
# Runs from system cron. Checks all open PRs targeting master.
# Reviews unreviewed ones sequentially via review-pr.sh.
#
# Peek while running:  cat /tmp/harb-review-status
# Full log:            tail -f /home/debian/harb/logs/review.log

set -euo pipefail

# --- Environment (cron-safe) ---
export PATH="/home/debian/.nvm/versions/node/v22.20.0/bin:/usr/local/bin:/usr/bin:/bin:$PATH"
export HOME="${HOME:-/home/debian}"

# --- Config ---
REPO="johba/harb"
SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
CODEBERG_TOKEN="$(awk '/codeberg.org/{getline;getline;print $2}' ~/.netrc)"
API_BASE="https://codeberg.org/api/v1/repos/${REPO}"
LOGDIR="/home/debian/harb/logs"
LOGFILE="$LOGDIR/review.log"
STATUSFILE="/tmp/harb-review-status"
MAX_REVIEWS=3

mkdir -p "$LOGDIR"

log() {
  local ts
  ts="$(date -u '+%Y-%m-%d %H:%M:%S UTC')"
  echo "[$ts] $*" >> "$LOGFILE"
  echo "[$ts] $*"
}

# --- Log rotation (keep last 50KB, archive once) ---
if [ -f "$LOGFILE" ] && [ "$(stat -c%s "$LOGFILE" 2>/dev/null || echo 0)" -gt 51200 ]; then
  mv "$LOGFILE" "$LOGFILE.1"
  # Only keep one rotated file
  rm -f "$LOGFILE.2"
  log "Log rotated"
fi

log "--- Poll start ---"

# --- Fetch open PRs targeting master ---
PRS=$(curl -sf -H "Authorization: token ${CODEBERG_TOKEN}" \
  "${API_BASE}/pulls?state=open&limit=20" | \
  jq -r '.[] | select(.base.ref == "master") | "\(.number) \(.head.sha)"')

if [ -z "$PRS" ]; then
  log "No open PRs targeting master"
  exit 0
fi

TOTAL=$(echo "$PRS" | wc -l)
log "Found ${TOTAL} open PRs"

REVIEWED=0
SKIPPED=0

while IFS= read -r line; do
  PR_NUM=$(echo "$line" | awk '{print $1}')
  PR_SHA=$(echo "$line" | awk '{print $2}')

  # Quick pre-check: CI status (avoid calling review-pr.sh just to skip)
  CI_STATE=$(curl -sf -H "Authorization: token ${CODEBERG_TOKEN}" \
    "${API_BASE}/commits/${PR_SHA}/status" | jq -r '.state // "unknown"')

  if [ "$CI_STATE" != "success" ]; then
    log "  #${PR_NUM} CI=${CI_STATE}, skip"
    SKIPPED=$((SKIPPED + 1))
    continue
  fi

  # Check for existing review at this SHA
  HAS_REVIEW=$(curl -sf -H "Authorization: token ${CODEBERG_TOKEN}" \
    "${API_BASE}/issues/${PR_NUM}/comments?limit=50" | \
    jq -r --arg sha "$PR_SHA" \
    '[.[] | select(.body | contains("<!-- reviewed:")) | select(.body | contains($sha))] | length')

  if [ "$HAS_REVIEW" -gt "0" ]; then
    log "  #${PR_NUM} already reviewed at ${PR_SHA:0:7}, skip"
    SKIPPED=$((SKIPPED + 1))
    continue
  fi

  log "  #${PR_NUM} needs review (CI=success, SHA=${PR_SHA:0:7})"

  if "${SCRIPT_DIR}/review-pr.sh" "$PR_NUM" 2>&1; then
    REVIEWED=$((REVIEWED + 1))
  else
    log "  #${PR_NUM} review failed"
  fi

  if [ "$REVIEWED" -ge "$MAX_REVIEWS" ]; then
    log "Hit max reviews (${MAX_REVIEWS}), stopping"
    break
  fi

  sleep 2

done <<< "$PRS"

log "--- Poll done: ${REVIEWED} reviewed, ${SKIPPED} skipped ---"