#!/usr/bin/env bash

# This script is run from the user's Constellation workspace (BUILD_WORKING_DIRECTORY).
# It prepares the workspace by symlinking all required binaries into folder.

###### script header ######

lib=$(realpath @@BASE_LIB@@) || exit 1
stat "${lib}" >> /dev/null || exit 1

# shellcheck source=../sh/lib.bash
if ! source "${lib}"; then
  echo "Error: could not find import"
  exit 1
fi

bootstrapper=$(realpath @@BOOTSTRAPPER@@)
stat "${bootstrapper}" >> /dev/null
upgrade_agent=$(realpath @@UPGRADE_AGENT@@)
stat "${upgrade_agent}" >> /dev/null
cli=$(realpath @@CLI@@)
stat "${cli}" >> /dev/null
cdbg=$(realpath @@CDBG@@)
stat "${cdbg}" >> /dev/null
container_sums=$(realpath @@CONTAINER_SUMS@@)
stat "${container_sums}" >> /dev/null

cd "${BUILD_WORKING_DIRECTORY}"

###### script body ######

replace_prefix() {
  local host_cache=$1
  local builder_cache=$2
  local dir=$3
  if [[ ${dir#"${builder_cache}"} == "${dir}" ]]; then
    echo "${dir}"
    return
  fi
  relpath=${dir#"${builder_cache}"}
  realpath -m "${host_cache}/${relpath}"
}

# Set HOST_CACHE when running in a container with mounted cache.
host_cache="${HOST_CACHE:-${HOME}/.cache}"
builder_cache="${HOME}/.cache"

if [[ $# -eq 0 ]]; then
  workdir="."
else
  workdir="$1"
fi

ln -sf "$(replace_prefix "${host_cache}" "${builder_cache}" "${bootstrapper}")" "${workdir}/bootstrapper"
ln -sf "$(replace_prefix "${host_cache}" "${builder_cache}" "${upgrade_agent}")" "${workdir}/upgrade-agent"
ln -sf "$(replace_prefix "${host_cache}" "${builder_cache}" "${cli}")" "${workdir}/constellation"
ln -sf "$(replace_prefix "${host_cache}" "${builder_cache}" "${cdbg}")" "${workdir}/cdbg"
ln -sf "$(replace_prefix "${host_cache}" "${builder_cache}" "${container_sums}")" "${workdir}/container_sums.sha256"