#! /usr/bin/env bash

# This script is meant to be kept small and simple
# If you think about adding features, it's probably a bad idea

set -e # exit if a command fails
set -o pipefail # Will return the exit status of make if it fails

project_source_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"

job_count='4'
if command -v nproc >/dev/null
then
	job_count="$(nproc)"
fi

build_dir="${project_source_dir}/build${SUBDIR:+/${SUBDIR}}"
install_dir="${project_source_dir}/install${SUBDIR:+/${SUBDIR}}"

build_type='Release'

cmake_user_opts=''
while [ ! -z ${1} ]
do
    case "${1}" in
    '-j'*)
        job_count="${1:2}"
        shift
        ;;
    '--debug')
        build_type='Debug'
        shift
        ;;
    *)
	cmake_user_opts+=" ${1}"
	shift
        ;;
    esac
done

cmake_opts=''
case "$(uname -s)" in
	'Linux')
		# no tweak required
		;;
	'FreeBSD')
		if [ -f "$(ls '/usr/local/bin/g++'* | sort | tail -n1)" ]
		then
			gcc_version="$(ls '/usr/local/bin/g++'* | sort | tail -n1 | sed -e 's/.*[^0-9]\([0-9][0-9]*\)$/\1/')"
			cmake_opts+=" -DCMAKE_C_COMPILER=/usr/local/bin/gcc${gcc_version}"
			cmake_opts+=" -DCMAKE_CXX_COMPILER=/usr/local/bin/g++${gcc_version}"
		else
			printf "WARNING: GCC is recommended: if build fails, install GCC and retry\n" >&2
		fi
		;;
	'Darwin')
		if [ -f "$(ls '/usr/local/bin/g++-'* | sort | tail -n1)" ]
		then
			gcc_version="$(ls '/usr/local/bin/g++-'* | sort | tail -n1 | sed -e 's/.*[^0-9]\([0-9][0-9]*\)$/\1/')"
			cmake_opts+=" -DCMAKE_C_COMPILER=/usr/local/bin/gcc-${gcc_version}"
			cmake_opts+=" -DCMAKE_CXX_COMPILER=/usr/local/bin/g++-${gcc_version}"
		else
			printf "WARNING: GCC is recommended: if build fails, install GCC and retry\n" >&2
		fi
		;;
	'MSYS_NT-'*)
		# no tweak required
		;;
	'CYGWIN_NT-'*|'MINGW'*'_NT-'*)
		printf "WARNING: system is not tested: if build fails, use MSYS2 instead\n" >&2
		;;
	*)
		printf "WARNING: system is not tested\n" >&2
		;;
esac

fetch_submodules_cmd=''
if ! [ -f "${project_source_dir}/libs/crunch/inc/crn_decomp.h" ]
then
	fetch_submodules_cmd='git submodule update --init --recursive'
fi

set -x

cd "${project_source_dir}"

${fetch_submodules_cmd}

cmake \
	-G'Unix Makefiles' \
	-H'.' \
	-B"${build_dir}" \
	-D'CMAKE_INSTALL_PREFIX'="${install_dir}" \
	-D'CMAKE_BUILD_TYPE'="${build_type}" \
	${cmake_opts} \
	${cmake_user_opts} \
	${@}

cmake \
	--build "${build_dir}" \
	-- \
	-j"${job_count}" \
	install