#!/usr/bin/env bash
# Reclaim Docker's unused cache so host storage stays bounded.
#
# Safe scopes only, by design:
#   - BuildKit cache older than 72h, hard-capped at 4 GB (Debian /pnpm store is
#     shared across builds; everything newer than that speeds up rebuilds).
#   - Images referenced by NO running/stopped container and older than 7 days
#     (covers stale epicnext-cms sha tags, old mariadb/byparr pulls, etc.).
#   - Containers stopped for more than 24h.
#
# Volumes are NEVER pruned here: mariadb-turbo-data is a database. This script
# is idempotent and exits 0 when Docker is unavailable.
set -Eeuo pipefail
DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
LOG_DIR="${LOG_DIR:-$DIR/logs}"
mkdir -p "$LOG_DIR"
LOG_FILE="$LOG_DIR/docker-prune.log"
now() { date '+%Y-%m-%d %H:%M:%S'; }

command -v docker >/dev/null 2>&1 || {
  printf '[%s] docker CLI unavailable; nothing to prune\n' "$(now)" >>"$LOG_FILE"
  exit 0
}

printf '\n[%s] === docker prune start ===\n' "$(now)" >>"$LOG_FILE"
docker system df >>"$LOG_FILE" 2>&1 || true

docker builder prune -af --filter "until=72h" --max-used-space=4g >>"$LOG_FILE" 2>&1 || true
docker image prune -af --filter "until=168h" >>"$LOG_FILE" 2>&1 || true
docker container prune -f --filter "until=24h" >>"$LOG_FILE" 2>&1 || true

printf '\n[%s] === docker prune complete ===\n' "$(now)" >>"$LOG_FILE"
docker system df >>"$LOG_FILE" 2>&1 || true