#!/bin/bash


. "$(dirname "$0")/common.sh" || exit 1
. "${BUILD_LIBRARY_DIR}/prefix_util.sh" || exit 1

assert_inside_chroot
assert_not_root_user

staging_dir_opt_placeholder="${DEFAULT_STAGING_ROOT}prefix-<board>/<prefix-name>"
final_dir_opt_placeholder="${SCRIPTS_DIR}/__prefix__/<board>/<prefix-name>"

DEFINE_string board "${DEFAULT_BOARD}" \
  "Board (architecture) to build for in prefix."
DEFINE_string staging_dir "${staging_dir_opt_placeholder}" \
  "Staging (build) directory for this prefix."
DEFINE_string final_dir "${final_dir_opt_placeholder}" \
   "Local directory to install the final prefixed binaries and runtime dependencies to.
   '<final-dir>/root' will contain the FS root to e.g. create a sysext from."
DEFINE_boolean force "${FLAGS_FALSE}" \
  "Force re-creating a prefix that already exists. THIS WILL REMOVE THE OLD PREFIX ENTIRELY."
DEFINE_boolean uninstall "${FLAGS_FALSE}" \
  "Uninstall an existing prefix, removing all directories and wrapper scripts associated with it.
   If set, <prefix path> can be omitted."
DEFINE_string cross_boss_root "${SCRIPTS_DIR}/cross-boss" \
  "Custom cross-boss scripts root."

# TODO: implement
#DEFINE_string custom_ebuild_overlays "" \
#  "Comma-separated list of additional ebuild overlays to add to the prefix."

FLAGS_HELP="usage: setup_prefix [flags] <prefix name> <prefix path>

setup_prefix creates a new prefix as well as an emerge wrapper.

  <prefix name> - Common name of the prefix. Will be used for naming portage wrappers.

  <prefix path> - Absolute library / executables path to use for this prefix, e.g. '/usr/local/mystuff'.
                    Binaries and libraries will live below <prefix>; binaries will be
                    linked against <prefix>/lib etc. Should start with /usr or /opt if you
                    want to use the installation directory to create a sysext.

Please refer to PREFIX.md for general information on prefixes.
"

show_help_if_requested "$@"
FLAGS "$@" || exit 1
eval set -- "${FLAGS_ARGV}"

switch_to_strict_mode -uo pipefail

name="${1:-}"
prefix="${2:-}"

if [ "${FLAGS_uninstall}" = "${FLAGS_TRUE}" ] ; then
  # We don't really care about prefix when uninstalling.
  # Make sure it is set so we don't need to set it on the uninstall command line.
  prefix="ignored"
fi

if [[ ! ${name} || ! ${prefix} ]] ;  then
  error "Missing mandatory positional parameter."
  flags_help
  exit 1
fi

if [ "${FLAGS_staging_dir}" = "${staging_dir_opt_placeholder}" ] ; then
  FLAGS_staging_dir="${DEFAULT_STAGING_ROOT}prefix-${FLAGS_board}/${name}"
fi
if [ "${FLAGS_final_dir}" = "${final_dir_opt_placeholder}" ] ; then
  FLAGS_final_dir="${SCRIPTS_DIR}/__prefix__/${FLAGS_board}/${name}"
fi

#
# Helper functions
#

function check_force_dirs() {
  local what="${1}"
  local dir="${2}"

  if [ -e "${dir}" ] ; then
    if [ "${FLAGS_force}" = "${FLAGS_FALSE}" ] ; then
      error "${what} directory '${dir}' already exists! Use --force to remove and to re-create prefix."
      exit 1
    else
      warn "Removing ${what} directory '${dir}' as requested ('--force' option)."
      sudo rm -rf "${dir}"
    fi
  fi
}
# --

#
# Main
#

set_prefix_vars "${name}" "${prefix}"
prefix_repo="$(dirname "$(EPREFIX="" portageq get_repo_path / portage-stable)")/prefix-overlay"

if [ "${FLAGS_uninstall}" = "${FLAGS_TRUE}" ] ; then
  warn "Removing prefix '${name}' and all associated direcroties and wrappers."
  sudo rm -vrf "${STAGINGDIR}" "${FINALDIR}"
  # TODO: cover all portage tools, not just emerge
  sudo rm -vf "$(emerge_name with-path)"
  exit
fi

if [ ! -e "${CB_ROOT}/bin/cb-bootstrap" ] ; then
  error "Cross-boss not found at '${CB_ROOT}'"
  error "Please make sure cross-boss is available (i.e. git clone https://github.com/chewi/cross-boss)."
  error "See PREFIX.md for more information."
  exit 1
fi

info "Installing SDK prerequisites and creating prefix directories"

check_force_dirs "staging" "${STAGINGDIR}"
check_force_dirs "installation" "${FINALDIR}"

setup_prefix_dirs "${prefix_repo}" 2>&1 | lineprepend "Prefix directories"

create_make_conf "staging"
create_make_conf "final"

install_prereqs "${prefix_repo}" 2>&1 | lineprepend "SDK prereqs"

# --

info "Bootstrapping staging environment in '${STAGINGROOT}'".
sudo env EPREFIX="${EPREFIX}" "${CB_ROOT}"/bin/cb-bootstrap "${STAGINGROOT}" 2>&1 | lineprepend "cb-bootstrap"

info "Extracting GCC libraries to installation root / final." 
extract_gcc_libs 2>&1 | lineprepend "GCC libs for final"

# TODO: cover all portage tools, not just emerge
info "Creating wrappers"
create_emerge_wrapper

info "Emerging installation root foundational dependencies."
$(emerge_name) prefix/prefix-final  | lineprepend "final init"

info "Done. Use '$(emerge_name)' to emerge packages into the prefix."