#!/usr/bin/env bash
# Delete photo files under storage/app/private/c2 older than a cutoff (mtime).
# Deletes as it finds — does not collect the full list first.
# Default cutoff: 2026-09-15 00:00:00 (keeps the 15th and later).
#
#   ./scripts/prune-c2-photos-before.sh
#   ./scripts/prune-c2-photos-before.sh --execute
#   BEFORE=2026-09-15 ./scripts/prune-c2-photos-before.sh --execute

set -u

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
if [ -z "${APP_ROOT:-}" ]; then
  APP_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
fi
BEFORE="${BEFORE:-2026-09-15}"
CUTOFF="${BEFORE} 00:00:00"
EXECUTE=0
if [ "${1:-}" = "--execute" ]; then
  EXECUTE=1
fi

PHOTOS="${APP_ROOT}/storage/app/private/c2/photos"
PREVIEWS="${APP_ROOT}/storage/app/private/c2/photo-previews"

if [ ! -d "$PHOTOS" ]; then
  echo "ERROR: missing $PHOTOS" >&2
  exit 2
fi

echo "=== prune c2 photos by mtime ==="
echo "app    : $APP_ROOT"
echo "cutoff : before $CUTOFF"
echo "mode   : $([ "$EXECUTE" -eq 1 ] && echo EXECUTE || echo DRY-RUN)"
echo "hint   : deletes while scanning; a line every 200 files"
echo

prune_dir() {
  local dir="$1"
  local label="$2"
  if [ ! -d "$dir" ]; then
    echo "$label: skip (missing)"
    return 0
  fi

  echo "$label: $dir"
  if [ "$EXECUTE" -eq 1 ]; then
    find "$dir" -type f ! -newermt "$CUTOFF" -print -delete
  else
    find "$dir" -type f ! -newermt "$CUTOFF" -print
  fi | awk -v label="$label" '
    {
      n++
      if (n <= 5 || n % 200 == 0) {
        print "  " label "  " n "  " $0
        fflush()
      }
    }
    END {
      print "  " label "  total=" (n + 0)
      fflush()
    }
  '
}

prune_dir "$PHOTOS" "photos"
prune_dir "$PREVIEWS" "previews"

if [ "$EXECUTE" -eq 1 ]; then
  find "$PHOTOS" -mindepth 1 -type d -empty -delete 2>/dev/null || true
  if [ -d "$PREVIEWS" ]; then
    find "$PREVIEWS" -mindepth 1 -type d -empty -delete 2>/dev/null || true
  fi
  echo "done (deleted as found)"
else
  echo "dry-run only; pass --execute to delete"
fi