#!/usr/bin/env bash

set -e

function usage()
{
	echo "'configure' configures SPDK to compile on supported platforms."
	echo ""
	echo "Usage: ./configure [OPTION]..."
	echo ""
	echo "Defaults for the options are specified in brackets."
	echo ""
	echo "General:"
	echo " -h, --help                Display this help and exit"
	echo " --enable-debug            Configure for debug builds"
	echo " --enable-werror           Treat compiler warnings as errors"
	echo " --enable-asan             Enable address sanitizer"
	echo " --enable-ubsan            Enable undefined behavior sanitizer"
	echo " --enable-coverage         Enable code coverage tracking"
	echo " --with-env=path           Use an alternate environment implementation"
	echo ""
	echo "Specifying Dependencies:"
	echo "--with-DEPENDENCY[=path]   Use the given dependency. Optionally, provide the"
	echo "                           path."
	echo "--without-DEPENDENCY       Do not link to the given dependency. This may"
	echo "                           disable features and components."
	echo ""
	echo "Valid dependencies are listed below."
	echo " dpdk                      Required unless providing an alternate env implementation."
	echo "                           example: /usr/share/dpdk/x86_64-default-linuxapp-gcc"
	echo " fio                       Required to build fio_plugin."
	echo "                           example: /usr/src/fio"
	echo " rbd                       [disabled]"
	echo "                           No path required."
	echo " rdma                      [disabled]"
	echo "                           No path required."
	echo ""
}

for i in "$@"; do
	case "$i" in
		-h|--help)
			usage
			exit 0
			;;
		--enable-debug)
			CONFIG_DEBUG=y
			;;
		--disable-debug)
			CONFIG_DEBUG=n
			;;
		--enable-asan)
			CONFIG_ASAN=y
			;;
		--disable-asan)
			CONFIG_ASAN=n
			;;
		--enable-ubsan)
			CONFIG_UBSAN=y
			;;
		--disable-ubsan)
			CONFIG_UBSAN=n
			;;
		--enable-coverage)
			CONFIG_COVERAGE=y
			;;
		--disable-coverage)
			CONFIG_COVERAGE=n
			;;
		--enable-werror)
			CONFIG_WERROR=y
			;;
		--disable-werror)
			CONFIG_WERROR=n
			;;
		--with-env=*)
			CONFIG_ENV="${i#*=}"
			;;
		--with-rbd)
			CONFIG_RBD=y
			;;
		--without-rbd)
			CONFIG_RBD=n
			;;
		--with-rdma)
			CONFIG_RDMA=y
			;;
		--without-rdma)
			CONFIG_RDMA=n
			;;
		--with-dpdk=*)
			CONFIG_DPDK_DIR="${i#*=}"
			;;
		--without-dpdk)
			CONFIG_DPDK_DIR=
			;;
		--with-fio=*)
			FIO_SOURCE_DIR="${i#*=}"
			CONFIG_FIO_PLUGIN=y
			;;
		--without-fio)
			FIO_SOURCE_DIR=
			CONFIG_FIO_PLUGIN=n
			;;
		--)
			break
			;;
		*)
			echo "Unrecognized option $i"
			usage
			exit 1
	esac
done

if [ -z "$CONFIG_ENV" ]; then
	if [ -z "$CONFIG_DPDK_DIR" ]; then
		echo "You must specify the path to dpdk using --with-dpdk=path."
		exit 1
	fi
fi

if [ "$CONFIG_FIO_PLUGIN" = "y" ]; then
	if [ -z "$FIO_SOURCE_DIR" ]; then
		echo "When fio is enabled, you must specify the fio directory using --with-fio=path"
		exit 1
	fi
fi

# Write the configuration file
rm -f CONFIG.local
if [ -n "$CONFIG_DEBUG" ]; then
	echo "CONFIG_DEBUG?=$CONFIG_DEBUG" >> CONFIG.local
fi
if [ -n "$CONFIG_WERROR" ]; then
	echo "CONFIG_WERROR?=$CONFIG_WERROR" >> CONFIG.local
fi
if [ -n "$CONFIG_COVERAGE" ]; then
	echo "CONFIG_COVERAGE?=$CONFIG_COVERAGE" >> CONFIG.local
fi
if [ -n "$CONFIG_ASAN" ]; then
	echo "CONFIG_ASAN?=$CONFIG_ASAN" >> CONFIG.local
fi
if [ -n "$CONFIG_UBSAN" ]; then
	echo "CONFIG_UBSAN?=$CONFIG_UBSAN" >> CONFIG.local
fi
if [ -n "$CONFIG_ENV" ]; then
	echo "CONFIG_ENV?=$CONFIG_ENV" >> CONFIG.local
fi
if [ -n "$CONFIG_DPDK_DIR" ]; then
	echo "CONFIG_DPDK_DIR?=$CONFIG_DPDK_DIR" >> CONFIG.local
fi
if [ -n "$CONFIG_FIO_PLUGIN" ]; then
	echo "CONFIG_FIO_PLUGIN?=$CONFIG_FIO_PLUGIN" >> CONFIG.local
fi
if [ -n "$FIO_SOURCE_DIR" ]; then
	echo "FIO_SOURCE_DIR?=$FIO_SOURCE_DIR" >> CONFIG.local
fi
if [ -n "$CONFIG_RDMA" ]; then
	echo "CONFIG_RDMA?=$CONFIG_RDMA" >> CONFIG.local
fi
if [ -n "$CONFIG_RBD" ]; then
	echo "CONFIG_RBD?=$CONFIG_RBD" >> CONFIG.local
fi

echo "Type make to build."

exit 0