#shellcheck shell=sh
# compose: find a usable docker compose, and call it once per project.
#
# The legacy engine ran one `docker compose up` per sub-stack, each time with
# the full file list, so N sub-stacks meant N identical calls. The CLI calls
# compose once per project (documented in spec/golden/DELTAS.md).

MYOS_COMPOSE_MIN_VERSION=${COMPOSE_VERSION:-2.24.4}

# myos_compose_bin  print the compose command to use, fail with MYOS_E_NOREQ
myos_compose_bin() {
  [ -n "${MYOS_COMPOSE_BIN:-}" ] && { printf '%s' "$MYOS_COMPOSE_BIN"; return 0; }
  if myos_have docker; then
    _v=$(docker compose version --short 2>/dev/null)
    if myos_verle "$MYOS_COMPOSE_MIN_VERSION" "$_v"; then printf 'docker compose'; return 0; fi
  fi
  if myos_have docker-compose; then
    _v=$(docker-compose version --short 2>/dev/null)
    if myos_verle "$MYOS_COMPOSE_MIN_VERSION" "$_v"; then printf 'docker-compose'; return 0; fi
  fi
  myos_error "docker compose >= $MYOS_COMPOSE_MIN_VERSION not found (install the docker compose plugin or docker-compose)"
  return "$MYOS_E_NOREQ"
}

# myos_compose PROJECT FILES -- ARGS...
# FILES is a newline separated list; the project directory is that of the first
# file, so relative build contexts and env_file entries keep working.
myos_compose() {
  _project=$1; _files=$2; shift 2
  [ "${1:-}" = "--" ] && shift
  [ -n "$_files" ] || { myos_error "no compose file for project $_project"; return "$MYOS_E_NOSTACK"; }
  _bin=$(myos_compose_bin) || return $?

  _fargs=""
  _first=""
  for _f in $_files; do
    [ -n "$_first" ] || _first=$_f
    _fargs="$_fargs -f $_f"
  done
  _dir=$(dirname "$_first")

  # variables the compose files reference, plus the network names they default
  # on (networks.yml is appended after the scan, so its variables are added here)
  # shellcheck disable=SC2086  # both are deliberate word lists
  _vars=$(myos_env_vars $_files)
  # shellcheck disable=SC2086
  _envargs=$(myos_env_export $_vars DOCKER_NETWORK_DEFAULT DOCKER_NETWORK_PRIVATE DOCKER_NETWORK_PUBLIC COMPOSE_SERVICE_NAME)

  if [ "${DRYRUN:-false}" = true ]; then
    printf '%s%s -p %s --project-directory %s %s\n' "$_bin" "$_fargs" "$_project" "$_dir" "$*"
  else
    _IFS=$IFS; IFS='
'
    # shellcheck disable=SC2046,SC2086  # deliberate word splitting on IFS=newline
    env $_envargs $_bin --ansi=auto $_fargs -p "$_project" --project-directory "$_dir" "$@"
    _rc=$?
    IFS=$_IFS
    return $_rc
  fi
}