#!/bin/sh
# POSIX-only, /bin/sh compatible, ASCII-only
# Dry-run by default; use --write to apply changes
# Logs: $LOG_DIR, Plan: $PLAN_OUT
set -u

# Load env
if [ -f "/etc/synomap/synomap.env" ]; then
  . /etc/synomap/synomap.env
fi

QB_URL="${QB_URL:-}"; QB_USER="${QB_USER:-}"; QB_PASS="${QB_PASS:-}"
MAP_FILE="${MAP_FILE:-}"; TORR_ROOT="${TORR_ROOT:-/syno/torrents/completed}"
QB_CATEGORIES="${QB_CATEGORIES:-sonarr,radarr}"
QB_EXCLUDE_CATEGORIES="${QB_EXCLUDE_CATEGORIES:-hum}"
TAG_DONE="${TAG_DONE:-SYNO}"; PLAN_OUT="${PLAN_OUT:-/root/synomap_plan.txt}"
LOG_DIR="${LOG_DIR:-/var/log/synomap}"; LOCK_DIR="${LOCK_DIR:-/var/lock/synomap}"
UMASK_VAL="${UMASK:-002}"; DIRECTION="${DIRECTION:-LIB_TO_TORRENTS}"
QB_TIMEOUT="${QB_TIMEOUT:-10}"
QB_FETCH_LIMIT="${QB_FETCH_LIMIT:-500}"
QB_FETCH_FACTOR="${QB_FETCH_FACTOR:-20}"

umask "$UMASK_VAL"; mkdir -p "$LOG_DIR" "$LOCK_DIR" 2>/dev/null || true

DRY=1; WRITE=0; PLAN=""; LIMIT=""
log(){ printf "%s %s\n" "$(date +%Y-%m-%dT%H:%M:%S)" "$*" | tee -a "$LOG_DIR/synomap.log"; }
nok(){ log "[NOK] $*"; }; ok(){ log "[OK]  $*"; }; note(){ log "[NOTE] $*"; }

qb_cookie=""
qb_login(){
  qb_cookie="$(mktemp)"
  curl -m "$QB_TIMEOUT" -sS -c "$qb_cookie" \
    --data-urlencode "username=$QB_USER" \
    --data-urlencode "password=$QB_PASS" \
    "$QB_URL/api/v2/auth/login" >/dev/null 2>&1 || return 1
  return 0
}
qb_api(){
  m="$1"; shift; p="$1"; shift
  if [ "$m" = "GET" ]; then
    curl -m "$QB_TIMEOUT" -sS -b "$qb_cookie" "$QB_URL$p" 2>/dev/null
  else
    curl -m "$QB_TIMEOUT" -sS -b "$qb_cookie" -X POST "$QB_URL$p" "$@" 2>/dev/null
  fi
}
qb_info_many(){
  lim="$QB_FETCH_LIMIT"
  if [ -n "$LIMIT" ]; then
    case "$LIMIT" in *[!0-9]*|"") : ;; *) lim=$((LIMIT * QB_FETCH_FACTOR));; esac
  fi
  qb_api GET "/api/v2/torrents/info?limit=$lim"
}
qb_set_location(){ qb_api POST "/api/v2/torrents/setLocation" --data "hashes=$1" --data-urlencode "location=$2"; }
qb_add_tags(){ qb_api POST "/api/v2/torrents/addTags" --data "hashes=$1" --data-urlencode "tags=$2"; }
qb_recheck(){ qb_api POST "/api/v2/torrents/recheck" --data "hashes=$1"; }
poll_state(){
  h="$1"; tm="${2:-120}"; i=0
  while [ "$i" -lt "$tm" ]; do
    st="$(qb_api GET "/api/v2/torrents/info?hashes=$h" | tr -d '\r\n')"
    state="$(printf "%s" "$st" | sed -n 's/.*\"state\":\"\([^\"]*\)\".*/\1/p')"
    [ -n "$state" ] && log "[STATE] $h = $state"
    case "$state" in
      checking*|queuedForChecking) : ;;
      *) break ;;
    esac
    sleep 2; i=$((i+2))
  done
}

while [ $# -gt 0 ]; do
  case "$1" in
    --write) DRY=0; WRITE=1; shift;;
    --dry-run) DRY=1; WRITE=0; shift;;
    --plan) PLAN="$2"; shift 2;;
    --limit) LIMIT="$2"; shift 2;;
    *) note "arg ignored: $1"; shift;;
  case_esac=true
  esac
done

# synomap_cleanup_omv_only.sh (r8)
# Still idempotent: only deletes from the SRC listed in plan if all files have nlinks>=2

[ -n "$PLAN" ] && PLAN_IN="$PLAN" || PLAN_IN="$PLAN_OUT"
[ -f "$PLAN_IN" ] || { nok "Plan missing: $PLAN_IN"; exit 0; }

safefile_has_hardlink(){ n="$(stat -c '%h' "$1" 2>/dev/null || echo 0)"; [ "$n" -ge 2 ]; }

i=0
while IFS='|' read -r h srclib dsttor catg; do
  [ -z "$h" ] && continue
  i=$((i+1)); log "[CLEAN] $i srclib=$srclib"
  if [ "$DRY" -eq 1 ]; then log "Would check nlinks and remove: $srclib"; continue; fi
  if [ -d "$srclib" ]; then
    SAFE=1
    while IFS= read -r -d '' f; do
      safefile_has_hardlink "$f" || { SAFE=0; log "[WARN] nlinks<2 for $f ; skip $srclib"; break; }
    done <<EOF
$(find "$srclib" -type f -print0)
EOF
    [ "$SAFE" -eq 1 ] && find "$srclib" -type f -delete && find "$srclib" -type d -empty -delete && ok "Cleaned: $srclib"
  elif [ -f "$srclib" ]; then
    safefile_has_hardlink "$srclib" && rm -f "$srclib" && ok "Removed file: $srclib" || log "[WARN] nlinks<2 for file: $srclib"
  fi
done < "$PLAN_IN"

ok "Cleanup finished"; exit 0