#!/bin/sh

# Shared, daemon-scoped lock for operations that stop or replace one Compose Qdrant volume.
# The stopped container name is the atomic primitive; ownership labels prevent a cleanup trap
# from deleting a lock that it did not create.
vector_operation_lock_init() {
  operation_lock_name="${expected_volume_name}-operation-lock"
  operation_lock_owner="${project_name}-$$-$(date -u +%Y%m%dT%H%M%S)"
  operation_lock_acquired=0
}

acquire_vector_operation_lock() {
  if docker create \
    --name "$operation_lock_name" \
    --label "com.thothii.qdrant-operation-owner=$operation_lock_owner" \
    --label "com.thothii.qdrant-operation-project=$project_name" \
    --label "com.thothii.qdrant-operation-volume=$expected_volume_name" \
    "$helper_image" /bin/true >/dev/null 2>&1; then
    operation_lock_acquired=1
    return 0
  fi

  if docker inspect "$operation_lock_name" >/dev/null 2>&1; then
    echo "Qdrant operation already in progress for $expected_volume_name" >&2
  else
    echo "Unable to acquire Qdrant operation lock for $expected_volume_name" >&2
  fi
  return 2
}

release_vector_operation_lock() {
  [ "${operation_lock_acquired:-0}" -eq 1 ] || return 0
  metadata=$(docker inspect --format \
    '{{ index .Config.Labels "com.thothii.qdrant-operation-owner" }} {{ index .Config.Labels "com.thothii.qdrant-operation-volume" }}' \
    "$operation_lock_name" 2>/dev/null || true)
  set -- $metadata
  if [ "${1-}" != "$operation_lock_owner" ] || [ "${2-}" != "$expected_volume_name" ]; then
    echo "Qdrant operation lock ownership changed; refusing to remove it" >&2
    operation_lock_acquired=0
    return 1
  fi
  if ! docker rm -f "$operation_lock_name" >/dev/null; then
    echo "Unable to release Qdrant operation lock for $expected_volume_name" >&2
    operation_lock_acquired=0
    return 1
  fi
  operation_lock_acquired=0
}